HARRIS CHEMICAL NORTH AMERICA INC
10-Q, 1996-08-12
MINING & QUARRYING OF NONMETALLIC MINERALS (NO FUELS)
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<PAGE> 1                  
- - ------------------------------------------------------------------------------
                                UNITED STATES
                     SECURITIES AND EXCHANGE COMMISSION
                            WASHINGTON, D.C. 20549

                                 FORM 10 - Q

/X/   QUARTERLY REPORT PURSUANT TO SECTION 13 OR 15(d)OF THE SECURITIES       
      EXCHANGE ACT OF 1934

      For the quarterly period ended June 29, 1996

                                    OR

/ /   TRANSITION REPORT PURSUANT TO SECTION 13 OR 15(d)OF THE SECURITIES
      EXCHANGE ACT OF 1934

      For the transition period from       to 
                    
                      
                      Commission file number 33-67546
                      

                      HARRIS CHEMICAL NORTH AMERICA, INC.
           (Exact name of registrant as specified in its charter)


                                  DELAWARE
                      (State or other jurisdiction of
                      incorporation or organization)
 
                          399 PARK AVENUE, 32nd FLOOR
                            NEW YORK, NEW YORK 10022
                    (Address of principal executive offices)
                                  (Zip Code)

                                  48-1135402
                    (I.R.S. Employer Identification Number)

                               (212) 207-6400
              (Registrant's telephone number, including area code)

Indicate by check mark whether the registrant (1) has filed all reports
required to be filed by Section 13 or 15(d) of the Securities Exchange Act of
1934 during the preceding 12 months (or for such shorter period that the
registrant was required to file such reports), and (2) has been subject to
such filing requirements for the past 90 days.

                               Yes (X)   No ( )

The number of shares outstanding of the registrant's Common stock at June
29, 1996 was 1,000 shares. All of such shares are owned by Harris Chemical
Group, Inc.





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<PAGE> 2
                HARRIS CHEMICAL NORTH AMERICA, INC.

           FORM 10-Q For the Quarter ended June 29, 1996

                               Index

                                                          Page #
                                                          ------
PART I   Financial Information 

Item 1   Financial Statements                                3

Item 2   Management's Discussion and Analysis of Financial
         Condition and Results of Operations                 14

PART II  Other Information

Item 1   Legal Proceedings                                   20

Item 6   Exhibits and Reports on Form 8-K                    20
         
Signature Page                                               20





































<PAGE> 3
PART I. FINANCIAL INFORMATION
Item 1. Financial Statements
                     HARRIS CHEMICAL NORTH AMERICA, INC. AND SUBSIDIARIES
                                    CONSOLIDATED BALANCE SHEETS
                                    (in thousands) (Unaudited)
<TABLE>                                         
<CAPTION>
                                                  June 24,       March 30,     June 29,                
                                                    1995           1996          1996                   
                                                -------------   ----------   -------------
<S>                                             <C>             <C>          <C>                     
                   ASSETS                         
Current assets:
  Cash and cash equivalents.................... $    -          $   9,093    $    -  
  Trade accounts receivable, less allowance for 
  doubtful accounts of $1,224 at June 24, 1995,
  $2,336 at March 30, 1996 and $1,143 at
  June 29, 1996................................    65,959         109,542       77,413
  Other receivables............................     7,321           9,572        6,455
  Inventories..................................   103,874         103,255      117,210
  Deferred income taxes........................     8,755           6,235        6,181
  Other........................................     4,378           4,787        7,735
                                                ----------      ----------   ----------
    Total current assets.......................   190,287         242,484      214,994
Property, plant and equipment..................   395,821         403,286      395,956
Investments....................................    13,626           1,989        1,989
Deferred financing costs.......................    27,147          23,840       22,931
Other..........................................     2,761           6,374        6,193
                                                ----------      ----------   ----------
    Total assets............................... $ 629,642       $ 677,973    $ 642,063
                                                ==========      ==========   ==========
      LIABILITIES AND STOCKHOLDER'S DEFICIT
Current liabilities:
  Current portion of long-term debt............ $   7,494       $   6,788    $   6,653
  Accounts payable.............................    50,758          66,301       59,262
  Accrued expenses.............................    18,191          19,442       18,480
  Accrued salaries and wages...................    11,444          13,658       14,762
  Accrued interest.............................    11,541          24,234       23,790
  Income taxes payable.........................       667           1,181          728
                                                ----------      ----------   ---------- 
    Total current liabilities..................   100,095         131,604      123,675
Long-term debt, net of current portion.........   755,326         785,470      775,989
Deferred income taxes..........................    21,380          22,865       22,077
Other noncurrent liabilities...................    20,226          18,964       16,294
Commitments and contingencies                      
Common stockholder's deficit:
  Common stock, at par.........................       -               -            -
  Additional paid in capital...................   107,253         103,441      103,441
  Cumulative translation adjustment............      (547)         (3,343)      (3,341)
  Common stockholder's receivable..............    (3,742)         (3,083)      (3,035)
  Accumulated deficit..........................  (370,349)       (377,945)    (393,037)
                                                ----------      ----------   ----------
    Total common stockholder's deficit.........  (267,385)       (280,930)    (295,972)
                                                ----------      ----------   ----------
    Total liabilities and stockholder's
      deficit.................................. $ 629,642       $ 677,973    $ 642,063 
                                                ==========      ==========   ==========
</TABLE>
    The accompanying notes are an integral part of the financial statements.
<PAGE> 4
                HARRIS CHEMICAL NORTH AMERICA, INC. AND SUBSIDIARIES
                         CONSOLIDATED STATEMENTS OF OPERATIONS
                                    (in thousands)
                                      (Unaudited)
<TABLE>    
<CAPTION>
                                             Thirteen weeks ended        
                                           -------------------------
                                             June 24,      June 29,  
                                               1995          1996       
                                           ----------     ----------  
<S>                                        <C>            <C>           
Net sales................................  $  87,379      $  99,581      
Cost of sales............................     76,896         81,478     
                                           ----------     ----------    
    Gross profit.........................     10,483         18,103      

Selling, general and 
  administrative expense ................     14,232         13,965     
                                           ----------     ----------     
    Operating income.....................     (3,749)         4,138      

Other income (expense):
  Interest expense.......................    (20,042)       (20,533)     
  Foreign currency 
    transaction gain (loss)..............      1,310            (31)     
  Other, net.............................      1,031          1,265     
                                           ----------     ----------    
    Loss before income 
      taxes..............................    (21,450)       (15,161)    
Benefit for income taxes.................       (304)           (69)    
                                           ----------     ----------    
    Net loss.............................  $ (21,146)     $ (15,092)    
                                           ==========     ==========    
</TABLE>
    The accompanying notes are an integral part of the financial statements.























<PAGE> 5
                  HARRIS CHEMICAL NORTH AMERICA, INC. AND SUBSIDIARIES
                        CONSOLIDATED STATEMENTS OF CASH FLOWS
                                    (in thousands)
                                      (Unaudited)
<TABLE>
<CAPTION>
                                                           Thirteen weeks ended
                                                         -------------------------
                                                          June 24,       June 29,  
                                                            1995            1996    
                                                         ----------     ----------
<S>                                                      <C>            <C>
Cash flows from operating activities:
  Net loss.............................................  $ (21,146)     $ (15,092)
  Adjustments to reconcile net loss to net cash flows
  from operating activities:
    Depreciation.......................................     13,592         15,042
    Finance fees amortization..........................      1,259          1,347
    Operating amortization.............................        180            195
    Accreted interest..................................      5,829            -
    Deferred income taxes..............................       (379)          (673)
    Unrealized foreign currency transaction loss (gain)      1,441           (230)
    Loss (gain) on disposal of property, plant and 
      equipment........................................        -               10
    Changes in operating assets and liabilities:
      Receivables......................................     27,439         35,246
      Inventories......................................    (15,995)       (14,212)
      Other assets.....................................       (525)        (2,886)
      Accounts payable, accrued expenses and other 
        noncurrent liabilities.........................    (25,148)        (6,804)
      Increase (decrease) in checks outstanding in
        excess of cash balances .......................        421         (3,497)
                                                         ----------     ----------
        Net cash provided by (used in) operating 
          activities...................................    (13,032)         8,446
                                                         ----------     ----------
Cash flows from investing activities:
  Capital expenditures.................................     (6,872)        (6,501)
  Capitalized interest.................................       (885)        (1,128)
  Proceeds from sales of property, plant and 
    equipment..........................................        -               20
  Other................................................       (827)           -
                                                         ----------     ----------
        Net cash used in investing activities..........     (8,584)        (7,609)
                                                         ----------     ----------
Cash flows from financing activities:
  Revolver borrowings..................................     31,000         72,173
  Revolver payments....................................    (14,000)       (80,044)
  Principal payments on other long-term debt, including
    capital leases.....................................     (1,060)        (1,663)
  Capitalized finance costs............................        -             (455)
  Receivable from HCG..................................       (462)            48
  Other................................................        485            -   
                                                         ----------     ----------
        Net cash provided by (used in) financing 
          activities...................................     15,963         (9,941)
                                                         ----------     ----------
Effect of exchange rate changes on cash................          5             11  
                                                         ----------     ----------
<PAGE> 6                  
                  HARRIS CHEMICAL NORTH AMERICA, INC. AND SUBSIDIARIES
                     CONSOLIDATED STATEMENTS OF CASH FLOWS-Continued
                                    (in thousands)
                                      (Unaudited)
                                                           Thirteen weeks ended
                                                         -------------------------
                                                          June 24,       June 29,  
                                                            1995            1996    
                                                         ----------     ----------
        Net decrease in cash...........................     (5,648)        (9,093)  
Cash and cash equivalents, beginning of period.........      5,648          9,093 
                                                         ----------     ----------
Cash and cash equivalents, end of period...............  $     -        $     -   
                                                         ==========     ==========
Supplemental disclosure of noncash activities:
  Inventory trade agreement:
    Inventory sold under trade agreement...............  $     269      $   1,271
    Inventory purchased under trade agreement..........       (530)        (1,785)
                                                         ----------     ----------
      Inventory payable under trade agreement..........  $    (261)      $   (514)
                                                         ==========     ==========
  Assets acquired under capital leases.................  $     335      $      75 
                                                         ==========     ==========
</TABLE>
      The accompanying notes are an integral part of the financial statements.


































<PAGE> 7 
           HARRIS CHEMICAL NORTH AMERICA, INC. AND SUBSIDIARIES
                NOTES TO CONSOLIDATED FINANCIAL STATEMENTS
                                (Unaudited)

1.  Basis of Presentation:

    The accompanying financial statements have not been audited but reflect
all normal recurring adjustments which, in the opinion of management, are
necessary for a fair presentation of the Company's financial position and
results of operations for the interim periods presented. These interim
financial statements should be read in conjunction with the consolidated
financial statements and the notes thereto for the fiscal year ("FY") ended
March 30, 1996 included in the Company's FY 1996 Form 10-K filed with the
Securities and Exchange Commission on July 15, 1996. The balance sheet as of
June 24, 1995 is presented to assist in understanding the impact of
seasonal fluctuations on the financial condition of the Company. Certain
reclassifications have been made to the prior year statement of operations 
and statement of cash flows to conform with the current year presentation.

2.  Organization:

    The consolidated financial statements include the consolidated accounts
of: Harris Chemical North America, Inc. ("Harris") and its wholly owned
subsidiaries, consisting principally of North American Chemical Company 
("NACC"), NAMSCO Inc. ("NAMSCO") and its wholly owned subsidiaries North 
American Salt Company ("NASC") and Sifto Canada Inc. ("Sifto"), and GSL 
Corporation ("GSL") and its wholly owned subsidiary Great Salt Lake Minerals 
Corporation ("GSLMC"). Harris and its direct and indirect subsidiaries are 
collectively referred to as the "Company." Harris is a wholly owned subsidiary 
of Harris Chemical Group, Inc. ("HCG").

3.  Details of Inventory and Net Property:

    Inventories (in thousands):

    Inventories are stated at the lower of cost or market, and consist of the
following:
                                June 24,      March 30,     June 29,
                                  1995          1996          1996     
                               ---------      --------     ---------
Finished goods................ $  72,736      $ 68,951     $  84,416  
Raw materials and supplies....    31,138        34,304        32,794 
                               ---------      --------     ---------
Total inventories............. $ 103,874      $103,255     $ 117,210 
                               =========      ========     =========

Property, Plant & Equipment (in thousands):

                                June 24,      March 30,     June 29,
                                  1995          1996          1996     
                               ---------      ---------    ---------
At cost....................... $ 622,981      $ 666,995    $ 674,652
Less accumulated depreciation
and amortization..............   227,160        263,709      278,696
                               ---------      ---------    ---------
Net property, plant and 
equipment..................... $ 395,821      $ 403,286    $ 395,956 
                               =========      =========    =========

<PAGE> 8
4.  Income Taxes:

    The financial statements for the thirteen weeks ended June 29, 1996
reflect a $69,000 income tax benefit arising from a $15,161,000 loss before
provision for income taxes. The net benefit is due to Sifto's current 
operating loss, offset by current U.S. alternative minimum tax. A $304,000
income tax benefit was recorded in the first quarter of the prior year for 
the same reason.
    The Company believes Sifto's Canadian net operating loss carryforwards 
will be fully utilized in the near future and as a result, the Company has
recognized the associated tax benefits. The Company believes that some 
uncertainty exists with the future utilization of its U.S. net operating loss 
carryforwards.  Therefore, in accordance with SFAS 109, the Company has 
recorded a valuation allowance against deferred income tax assets and has not 
recognized any income tax benefits associated with its U.S. current year loss.

5.  Subsequent Events:

    Sale and Leaseback of Argus Utilities:

    In July 1996, NACC entered into an agreement for the sale and leaseback of 
an electric and steam generating facility associated with its Searles Valley 
soda ash facilities (the "Argus Utilities"). Under the terms of the agreement 
the Argus Utilities were sold to two institutional investors for $75 million,
approximately $70.0 million in cash, net of related expenses and taxes. The 
initial term of the lease will be for approximately 13 years with a two-to- 
fifteen year reduced rate renewal option. After expiration of the reduced rate
renewal period there will be three fair market renewal options of up to 5 years
each. The Company has provided a guarantee for the performance of NACC's 
obligations under the lease and related agreements. In addition, during the 
initial term of the lease NACC has provided a letter of credit of approximately 
$15 million as additional credit support. The Company has also agreed to 
certain covenants, including maintaining access to adequate working capital, 
meeting fixed charge and interest coverage ratios, and restrictions on asset 
dispositions and mergers. Proceeds were used to provide the Company with 
additional liquidity by reducing the outstanding balance under its revolving 
credit agreement. The transaction will be accounted for as a financing 
transaction during the initial and reduced rate rental periods.

    ECMC Prepayment:

    As part of the original NACC acquisition, NACC assumed the seller's 
obligation under the Emission Controls, Maintenance and Construction Agreement 
("ECMC") with a provider of steam. Under the agreement, NACC must maintain 
certain emission standards and construct environmental upgrades (if required).
In consideration of the foregoing, NACC receives annual payments ranging from
$1.3 million to $7.5 million through 2015.

    NACC has reached an agreement in principle whereby the steam provider would
prepay a portion of the amounts due under the ECMC Agreement. The agreement 
provides that NACC would receive $22.8 million in cash and approximately $2.7 
million of debt owed by NACC will be forgiven. The present value of the ECMC 
payment streams being prepaid, including the forgiveness of debt, reflects an 
effective discount rate of approximately 10.8%. The prepayment and related 
forgiveness of debt will be recorded as deferred revenue and amortized over 
the remaining life of the ECMC Agreement.

    The agreement also provides for the sale by NACC of certain land, which the 
steam provider currently leases from NACC, for $0.4 million in cash.
<PAGE> 9
6.  Condensed Consolidating Financial Statements:

    Separate condensed consolidating financial statements of certain 
subsidiaries of the Company are presented below. Except for Sifto, which is 
domiciled in Canada, all subsidiaries of Harris are domiciled in the United 
States. In order to present the financial statements of Sifto separately, 
the financial statements of NAMSCO present the investment in Sifto using the 
cost method. 

    Separate financial statements of the subsidiaries of Harris which have
guaranteed Harris' and Sifto's outstanding public debt (the "Guarantors"),
including NACC, North American Terminals, Inc., NAMSCO, NASC, Carey Salt
Company, The Hutchinson & Northern Railway Company, GSL, GSLMC and White River 
Nahcolite Limited Liability Co. are not included for the following reasons: 
(i) pursuant to their respective guarantees, the Guarantors are jointly and 
severally liable with respect to Harris' and Sifto's outstanding public debt, 
(ii) the aggregate assets, liabilities, earnings and equity of the Guarantors 
and Sifto are substantially equal to the assets, liabilities, earnings and 
equity of Harris on a consolidated basis and (iii) accordingly, Harris does not 
believe that separate full financial statements concerning the Guarantors and 
Sifto are material to investors. Financial statements of the subsidiaries of 
Harris which are not Guarantors are not presented separately as these companies 
are immaterial.

                          CONDENSED CONSOLIDATING BALANCE SHEETS
                                       June 24, 1995
                                      (in thousands)
<TABLE>
<CAPTION>
                      NACC      GSL     NAMSCO    SIFTO     HCNA    Eliminations Consolidated
                   --------- -------- --------- --------- --------- ------------ ------------
<S>                <C>       <C>      <C>       <C>       <C>       <C>          <C>  
Cash.............. $     -   $    -   $     -   $     -   $   7,254 $  (7,254)   $    - 
Receivables.......    40,214    8,909    17,531     6,626       -         -         73,280  
Inventories.......    41,007   11,816    35,455    16,466       -        (870)     103,874 
Other current
 assets...........     8,572      842     1,864     1,638       217       -         13,133 
Property, plant
 equipment, net...   222,882   40,906    63,839    68,194       -         -        395,821
Investment in 
 Sifto............      -         -       2,513       -         -      (2,513)         - 
Other.............    13,015       67     1,866     3,440   346,943  (321,797)      43,534 
                   --------- -------- --------- --------- --------- ----------   ---------
 Total assets..... $ 325,690 $ 62,540 $ 123,068 $  96,364 $ 354,414 $(332,434)   $ 629,642  
                   ========= ======== ========= ========= ========= ==========   =========
Total current
 liabilities...... $  56,196 $  9,821 $  12,830 $  18,846 $   9,918 $  (7,516)   $ 100,095
Long-term debt....    51,719   10,247    20,941   100,952   571,467       -        755,326
Other noncurrent
 liabilities......    62,719  (16,293)   (3,854)  (28,420)   40,414   (12,960)      41,606
Total common
 stockholder's
 equity (deficit).   155,056   58,765    93,151     4,986  (267,385) (311,958)    (267,385)    
                   --------- -------- --------- --------- ---------- ---------   ----------
Total liabilities
 and common 
 stockholder's
 equity (deficit). $ 325,690 $ 62,540 $ 123,068 $  96,364 $ 354,414 $(332,434)   $ 629,642
                   ========= ======== ========= ========= ========= ==========   =========
<PAGE> 10
                        CONDENSED CONSOLIDATING BALANCE SHEETS
                                    June 29, 1996
                                   (in thousands)
                      NACC      GSL     NAMSCO    SIFTO     HCNA    Eliminations Consolidated
                   --------- -------- --------- --------- --------- ------------ ------------
Cash.............. $   -     $    -   $    -    $    -    $   4,578 $  (4,578)   $    - 
Receivables.......    46,211    8,031    20,164     8,623       839       -         83,868
Inventories.......    47,431   21,444    33,953    16,715       -      (2,333)     117,210 
Other current
 assets...........     9,157      369    (2,680)    6,468       602       -         13,916 
Property, plant
 equipment, net...   229,613   41,012    62,943    62,388       -         -        395,956
Investment in
 Sifto............      -        -        2,513      -          -      (2,513)        - 
Other.............     5,193       53     2,184     2,780   365,178  (344,275)      31,113 
                   --------- -------- --------- --------- --------- ----------   ---------  
 Total assets..... $ 337,605 $ 70,909 $ 119,077 $  96,974 $ 371,197 $(353,699)   $ 642,063  
                   ========= ======== ========= ========= ========= ==========   ========= 
Total current
 liabilities...... $  52,628 $ 10,213 $  24,415 $  17,986 $  23,073 $  (4,640)   $ 123,675
Long-term debt....    55,736    8,126    17,853   109,274   585,000      -         775,989
Other noncurrent                                                                      
liabilities......     80,222  (12,241)  (32,256)  (34,799)   59,096   (21,651)      38,371
Total common
 stockholder's
 equity (deficit).   149,019   64,811   109,065     4,513  (295,972) (327,408)    (295,972)
                   --------- -------- --------- --------- ---------  ---------   ----------
Total liabilities
 and common 
 stockholder's
 equity (deficit). $ 337,605 $ 70,909 $ 119,077 $  96,974 $ 371,197 $(353,699)   $ 642,063
                   ========= ======== ========= ========= ========= ==========   =========      
</TABLE>


























<PAGE> 11
                           CONDENSED CONSOLIDATING STATEMENT OF OPERATIONS
                             For the Thirteen Weeks Ended June 24, 1995
                                           (in thousands)
<TABLE>
<CAPTION>
                     NACC       GSL     NAMSCO     SIFTO     HCNA    Eliminations  Consolidated
                   --------  --------  --------  --------  --------  ------------  ------------
<S>                <C>       <C>       <C>       <C>       <C>       <C>           <C>
Net Sales......... $ 46,099  $ 15,921  $ 23,679  $ 14,575  $    -    $(12,895)     $  87,379
Cost of sales.....   46,214    12,556    18,897    11,740       -     (12,511)        76,896
                   --------  --------  --------  --------  --------  ---------     ---------
 Gross profit.....     (115)    3,365     4,782     2,835       -        (384)        10,483
Selling and
 administrative...    5,539     1,305     4,263     2,839       286       -           14,232
                   --------  --------  --------  --------  --------  ---------     ---------
 Operating income
 (loss)...........   (5,654)    2,060       519        (4)     (286)     (384)        (3,749)
Interest expense..      (43)      (36)     (145)   (2,401)  (17,417)      -          (20,042)
Other income
(expense).........    1,143     1,577    (1,704)    1,326    (3,443)    3,442          2,341
                   --------  --------  ---------  -------  --------  ---------     ---------
 Income (loss)
 before taxes.....   (4,554)    3,601    (1,330)   (1,079)  (21,146)    3,058        (21,450)
Income taxes......     -          660    (1,683)     (529)     -        1,248           (304)
                   --------  --------  --------  --------  --------  ---------     ---------- 
 Net income
 (loss)........... $ (4,554)  $ 2,941  $    353  $   (550) $(21,146) $  1,810      $ (21,146)
                   ========  ========  ========  ========  ========  =========     ==========



                           CONDENSED CONSOLIDATING STATEMENT OF OPERATIONS
                             For the Thirteen Weeks Ended June 29, 1996
                                           (in thousands)

                     NACC       GSL     NAMSCO     SIFTO     HCNA    Eliminations Consolidated
                   --------  --------  --------  --------  --------  ------------ ------------
Net Sales......... $ 52,716  $ 15,201  $ 26,158  $ 20,261  $   -     $ (14,755)   $  99,581
Cost of sales.....   44,505    13,379    19,807    16,877      -       (13,090)      81,478
                   --------  --------  --------  --------  --------  ----------   ---------
 Gross profit.....    8,211     1,822     6,351     3,384      -        (1,665)      18,103
Selling and
 administrative...    4,896     1,434     3,870     3,464       301       -          13,965
                   --------  --------  --------  --------  --------  ----------   ---------
 Operating income
 (loss)...........    3,315       388     2,481       (80)     (301)    (1,665)       4,138
Interest expense..      474       (63)     (150)   (2,540)  (18,254)      -         (20,533)
Other income
(expense).........    1,366     1,633    (1,755)      (10)    3,463     (3,463)       1,234
                   --------  --------  --------- --------  --------  ----------   ---------
 Income (loss)
 before taxes.....    5,155     1,958       576    (2,630)  (15,092)    (5,128)     (15,161)
Income taxes......     -         (154)      265      (294)     -           114          (69)
                   --------  --------  --------  --------  --------- ----------   ----------
 Net income
 (loss)........... $  5,155  $  2,112  $    311  $ (2,336) $(15,092) $  (5,242)   $ (15,092)
                   ========  ========  ========  ========= ========= ==========   ========== 
</TABLE>

<PAGE> 12
                            CONDENSED CONSOLIDATING STATEMENT OF CASH FLOWS
                               For the Thirteen Weeks Ended June 24, 1995
                                              (in thousands)
<TABLE>
<CAPTION>
                     NACC      GSL     NAMSCO     SIFTO     HCNA    Eliminations Consolidated
                   --------  -------  --------  --------- --------  ------------ ------------
<S>                  <C>     <C>      <C>       <C>       <C>       <C>          <C> 
Net operating
activities........ $ (2,729) $(8,488) $  4,209  $ (4,797) $(8,019)  $   6,792    $(13,032)
                   --------  -------- --------  --------- --------  ----------   --------- 
Investing:
 Capital
 expenditures.....   (3,799)    (440)   (1,879)     (754)     -           -        (6,872)
 Capitalized
 interest.........     (885)     -         -         -        -           -          (885)
 Proceeds from
 sales............      -        -         -         -        -           -           -
 Other............     (827)     -         -         -        524        (524)       (827)
                   --------- -------- --------- --------- --------  ----------   ---------
  Net investing...   (5,511)    (440)   (1,879)     (754)     524        (524)     (8,584)
                   --------- -------- --------- --------- --------  ----------   ---------
Financing:
 Borrowings.......   10,000   11,000    10,000       -        -           -        31,000
 Repayments.......   (1,760)  (2,072)  (11,126)     (102)     -           -       (15,060)
 Other............      -        -          43       -      2,898      (2,918)         23
                   --------- -------- --------- --------- --------  ----------   ---------
  Net financing...    8,240    8,928    (1,083)     (102)   2,898      (2,918)     15,963
                   --------- -------- --------- --------- --------  ----------   ---------     
Exchange rate
changes...........      -        -         -           5      -           -             5
                   --------- -------- --------- --------- --------  ----------   --------- 
  Net decrease in
  cash............      -        -       1,247    (5,648)  (4,597)       3,350     (5,648)
Cash beginning....      -        -      (1,247)    6,895      -           -         5,648 
                   --------- -------- --------- --------- --------  ----------   ---------
Cash ending....... $    -     $  -    $    -     $ 1,247  $(4,597)   $   3,350    $    - 
                   ========= ======== ========= ========= ========  ==========   =========

                               
                               
                               
                               
                               
                               
                               
                               
                               
                               
                               
                               
                               
                               
                               
                               
                               
                               
                               

<PAGE> 13
                            CONDENSED CONSOLIDATING STATEMENT OF CASH FLOWS
                                For the Thirteen Weeks Ended June 29, 1996
                                             (in thousands)                         
                     NACC      GSL     NAMSCO     SIFTO     HCNA    Eliminations Consolidated
                   --------  -------- --------- --------- --------- ------------ ------------
Net operating
activities........ $ 12,662  $ 5,544 $   9,162  $  3,542  $(16,771) $  (5,693)   $  8,446
                   --------  -------- --------- --------- --------- ----------   ---------  
Investing:
 Capital
 expenditures.....   (2,229)  (1,307)   (2,531)     (434)      -          -        (6,501)
 Capitalized
 interest.........   (1,128)     -         -         -         -          -        (1,128)
 Proceeds from
 sales............       20      -         -         -         -          -            20
 Other............      -        -         -         -      (3,465)     3,465         -
                   --------- -------- --------- --------- --------- ----------   --------- 
  Net investing...   (3,337)  (1,307)   (2,531)     (434)   (3,465)     3,465      (7,609)
                   --------- -------- --------- --------- --------- ----------   ---------
Financing:
 Borrowings.......    9,986   21,995    14,001    26,191       -          -        72,173
 Repayments.......   (3,171) (22,649)  (38,257)  (17,630)      -          -       (81,707)
 Other............  (16,140)  (3,583)   17,625   (20,773)   22,403         61        (407) 
                   --------- -------- --------- --------- --------- ----------   ---------
  Net financing...   (9,325)  (4,237)   (6,631)  (12,212)   22,403         61      (9,941) 
                   --------- -------- --------- --------- --------- ----------   --------- 
Exchange rate
changes...........      -        -         -          11       -          -            11
                   --------- -------- --------- --------- --------- ----------   ---------    
Net decrease in
cash..............      -        -         -      (9,093)    2,167     (2,167)     (9,093)
Cash beginning....      -        -         -       9,093     2,411     (2,411)      9,093 
                   --------- -------- --------- --------- --------- ----------   ---------
Cash ending....... $    -    $   -    $    -    $    -    $  4,578  $  (4,578)   $    -   
                   ========= ======== ========= ========= ========= ==========   ========= 
</TABLE>























<PAGE> 14
Item 2.
Management's Discussion and Analysis of Financial Condition and Results of 
Operations.

Thirteen Weeks Ended June 29, 1996 Compared With Thirteen Weeks Ended
June 24, 1995

    Net sales for the thirteen weeks ended June 29, 1996 (the "First
Quarter FY 1997") were $99.6 million compared to $87.4 million for the
thirteen weeks ended June 24, 1995 (the "First Quarter FY 1996").

    The following table presents the average price per ton, volume and net
sales by major product line for the First Quarter FY 1997 compared to the
First Quarter FY 1996. The average price is not indicative of the different
prices for separate products within a category and is affected by changes in
the product mix.


                                    Thirteen Weeks Ended         
                               -----------------------------------
                                  June 24,               June 29,
                                   1995                   1996     
                               -------------         -------------
SALT
Volume (000's tons)...........   1,073.2               1,261.4
Price/Ton.....................    $29.49                $27.97
Net Sales ($000's)............   $31,644               $35,287

SODA PRODUCTS
Volume (000's tons)...........     315.4                 345.3
Price/Ton.....................    $75.98                $90.32
Net Sales ($000's)............   $23,965               $31,186

BORON CHEMICALS
Volume (000's tons)...........      37.5                  36.6
Price/Ton.....................   $435.07               $470.33
Net Sales ($000's)............   $16,315               $17,214

SPECIALTY POTASH FERTILIZERS
Volume (000's tons)...........      93.4                  86.6
Price/Ton.....................   $139.21               $143.94
Net Sales ($000's)............   $13,002               $12,465

OTHER
Net Sales ($000's)............    $2,453                $3,429

TOTAL NET SALES...............   $87,379               $99,581


    First Quarter FY 1997 salt sales were $35.3 million or $3.6 million more
than First Quarter FY 1996. Actual tons sold increased 17.5%, generating a
favorable volume variance of $3.6 million. First Quarter FY 1997 salt prices
were flat compared to First Quarter FY 1996. Also, there was no significant 
change in the relative value of the Canadian dollar compared to the United 
States dollar in the First Quarter FY 1997 versus the First Quarter FY 1996.




<PAGE> 15
    Increased volume in the highway salt business generated a favorable
variance of $3.5 million primarily due to higher highway salt shipments in 
First Quarter FY 1997 caused by low or depleted inventories from the severe 
winter weather in the Third and Fourth Quarters of FY 1996. There was no 
significant change in general trade and chemical salt sales in First Quarter 
FY 1997 compared to First Quarter FY 1996.

    First Quarter FY 1997 soda products (soda ash, sodium sulfate and sodium
bicarbonate) sales were $31.2 million or $7.2 million higher than First Quarter
FY 1996. Increased ANSAC soda ash sales generated a $5.0 million favorable 
volume variance and favorable price variances of $1.0 million. Higher soda ash 
prices in domestic markets provided a favorable variance of $1.7 million, which 
was partially offset by unfavorable domestic soda ash volume variances of $0.8 
million. Other export soda ash volume and price variances were an unfavorable 
$0.3 million and $0.1 million, respectively. Sodium bicarbonate contributed 
favorable volume and price variances of $0.8 million and $0.2 million, 
respectively, due to an expansion into export markets. Sodium sulfate generated 
favorable price variances of $1.0 million which were offset by unfavorable 
volume variances of $1.3 million.

    Boron chemical sales were $17.2 million or $0.9 million higher than the 
First Quarter FY 1996. The favorable variance is due to favorable price and 
product sales mix variances of $0.6 million and $0.3 million, respectively. The
favorable price variance is a result of price increases which have continued on 
an upward trend since Fourth Quarter of FY 1996.
    
    Specialty potash fertilizer sales were $12.5 million or $0.5 million lower
than First Quarter FY 1996. The unfavorable variance was due to decreased 
domestic and export volume which generated unfavorable volume variances of 
$0.5 million and $0.3 million, respectively. The lower volumes versus First 
Quarter FY 1996 were largely a result of lost sales due to competitive pricing. 
The unfavorable domestic potash volume variances were partially offset by 
favorable price/mix variances of $0.3 million. Export potash prices were 
comparable to First Quarter FY 1996.

    Other product sales were $3.4 million or $1.0 million higher than First
Quarter FY 1996. The favorable sales versus First Quarter FY 1996 are largely
due to increased sales of magnesium chloride and increased revenue from other 
service subsidiaries of the Company, Trona Railway Company and North American 
Terminals, Inc. The improvement in magnesium chloride sales is the result of
increased marketing.

    Cost of sales was $81.5 million or 81.8% of net sales in First Quarter 
FY 1997 compared to $76.9 million or 88.0% of net sales in First Quarter 
FY 1996. The improvement in manufacturing cost is primarily due to positive 
manufacturing variances and lower maintenance costs. The every-other-year 
Searles Valley facilities shutdown and subsequent start-up difficulties in 
First Quarter FY 1996 increased maintenance costs compared to First Quarter
FY 1997. The favorable effect on cost of sales of increased production of 
highway salt, soda ash and magnesium chloride products in the First Quarter 
FY 1997 was partially offset by lower production of boron and specialty 
potash.

    Gross profit in First Quarter FY 1997 versus First Quarter FY 1996
increased by $7.6 million due to the improvement in sales and cost of sales 
discussed above.
    


<PAGE> 16
    Selling, general and administrative expenses were relatively unchanged, 
decreasing $0.3 million in First Quarter FY 1997 compared to First Quarter 
FY 1996.

    Operating income was $4.1 million in First Quarter FY 1997 versus an
operating loss of $3.7 million in First Quarter FY 1996 for the reasons 
discussed above.

    First Quarter FY 1997 interest expense was $0.5 million higher than First
Quarter FY 1996. The increase in interest expense is due to higher debt 
balances from the revolving line of credit and the Senior Secured Discount 
Notes due 2001. The Senior Secured Discount Notes accrued cash interest during 
the First Quarter FY 1997 compared to the accretion of interest on such Notes 
in First Quarter FY 1996. Interest capitalized on construction in process was 
$0.2 million higher in First Quarter FY 1997 versus First Quarter FY 1996, 
which partially offset the unfavorable interest expense.

    The translation of United States dollar-denominated debt of Sifto into 
Canadian dollars did not result in a material gain or loss in the First Quarter 
FY 1997, whereas a translation gain of $1.3 million was recorded in the First 
Quarter FY 1996 due to the strengthening of the Canadian dollar relative to the 
United States dollar. 

    Other income/expense in First Quarter FY 1997 was comparable to First
Quarter FY 1996.

    A $0.1 million benefit for income taxes was recorded in First Quarter FY
1997 primarily relating to Sifto's current operating loss, offset by current 
U.S. alternative minimum tax. A $0.3 million benefit for income taxes was 
recorded in First Quarter FY 1996 for the same reason. While the Company has 
recognized the full tax benefit associated with Sifto's current operating loss,
income tax benefits associated with the U.S. First Quarter FY 1997 loss have 
not been recognized as future realization is uncertain.

    A net loss of $15.1 million was recorded for First Quarter FY 1997 compared
to a net loss of $21.1 million in First Quarter FY 1996 due to the factors
described above.






















<PAGE> 17
Liquidity, Capital Resources and Financial Condition

First Quarter FY 1997 Cash Flows:

    First Quarter FY 1997 operating activities provided $8.4 million in net 
cash compared to cash used by operating activities of $13.0 million in First
Quarter FY 1996. Earnings before depreciation, amortization, interest and 
income taxes for First Quarter FY 1997 were $20.6 million or $9.6 million more
than First Quarter FY 1996. Cash interest expense was $20.5 million in First
Quarter FY 1997 or $6.3 million more in First Quarter FY 1997 due to higher 
debt balances and the commencement of cash interest payments on the Senior 
Secured Discount Notes. Income taxes paid increased $0.9 million in First 
Quarter FY 1997 versus First Quarter FY 1996. Noncash unrealized foreign 
currency transactions used $0.2 million versus cash provided in First Quarter 
FY 1996 of $1.4 million. Receivables provided $7.8 million more cash than First 
Quarter FY 1996 due to collections in First Quarter FY 1997 of additional 
year-end receivables generated by higher sales in FY 1996 versus FY 1995. Cash 
used for inventories decreased $1.8 million in First Quarter FY 1997 compared 
to First Quarter FY 1996. Other assets used $2.9 million or $2.4 million more 
in FY 1997 compared to First Quarter FY 1996. Accounts payable, accrued 
liabilities and other liabilities used $18.3 million less cash in First Quarter 
FY 1997 versus First Quarter FY 1996, which is partially offset by an increase 
in cash used for checks outstanding in excess of cash of $3.9 million.

    First Quarter FY 1997 cash used in investing activities was $7.6 million
or $1.0 million less than First Quarter FY 1996. The variance was primarily 
due to $0.8 million in investments in a joint venture, White River Nahcolite 
Limited Liability Co., in First Quarter FY 1996. The Company purchased the 
remaining 50% interest in the joint venture in the Second Quarter of FY 1996. 

    First Quarter FY 1997 cash used in financing activities was $9.9 million 
compared to cash provided by financing activities of $16.0 million in First 
Quarter FY 1996. Net revolver payments were $7.9 million compared to net
revolver borrowings of $17.0 million in First Quarter FY 1996, primarily due 
to improved cash provided by operating activities in First Quarter FY 1997 
compared to First Quarter FY 1996. Payments on long term debt were $0.6 million 
higher, primarily due to capital leases. Other financing activities used $0.4 
million primarily relating to the sale of the Argus Utilities (See Financial 
Statements Note 5).

Liquidity:

    The Company's accounts receivable and inventory levels can vary by as much
as $50.0 million during the year. Generally, accounts receivable and inventory
increase in the third and fourth fiscal quarters.  During the third quarter
deicing road salt inventories are increased in preparation for the winter
season.  The harvesting of the solar ponds at the Ogden facility also takes
place in the third quarter, adding to the inventory levels.  Inventories begin
to decline in the fourth quarter and accounts receivable increase as highway
salt sales and specialty potash fertilizer sales peak during this period. 
Cash requirements rapidly decline at the end of the fourth fiscal quarter and 
early part of the next fiscal year first fiscal quarter as accounts receivable 
are converted into cash.






<PAGE> 18
    In order to improve liquidity and to meet seasonal working capital needs, 
the Company has undertaken the following actions:
    
    1.  In June 1996, the Bank Agreements were amended (1) to permit the sale 
and leaseback of the Argus Utilities (discussed below), (2) to change 
commencement of the required clean down covenant period from October 15 of each 
fiscal year to April 30, 1996 and each anniversary thereof and (3) to stipulate 
that all of the proceeds from the sale and leaseback of the Argus Utilities be 
used to repay a portion of the outstanding borrowings in order to meet an 
additional one-time clean down covenant period ending in mid-August.
    
    2.  In July 1996, NACC entered into an agreement for the sale and leaseback 
of an electric and steam generating facility associated with its Searles Valley 
soda ash facilities (the "Argus Utilities"). Under the terms of the agreement 
the Argus Utilities were sold to two institutional investors for $75 million,
approximately $70.0 million in cash, net of related expenses and taxes. 
Proceeds were used to provide the Company with additional liquidity by reducing 
the outstanding balance under its revolving credit agreement. The Company has 
also agreed to provide a $15 million letter of credit as additional credit 
support. See Note 5 of the Financial Statements for further information.

    3.  NACC has reached an agreement in principle whereby a steam provider 
would prepay a portion of the amounts due under the ECMC Agreement. The 
agreement provides that NACC would receive $22.8 million in cash and 
approximately $2.7 million of debt owed by NACC will be forgiven. The present 
value of the ECMC payment streams being prepaid, including the forgiveness of 
debt, reflects an effective discount rate of approximately 10.8%.  

    The Company believes that the above actions, internal cash generated from 
operations plus liquidity provided by its revolving credit facilities will be 
adequate to meet the Company's anticipated working capital needs during the 
term of such facilities. As of July 27, 1996, the Company had $46.1 million of
available borrowing capacity under its revolving credit agreements.


























<PAGE> 19
Environmental Matters

    The nature of the Company's business requires a continual monitoring of
compliance with all applicable environmental laws and regulations. At
June 29, 1996, the Company had recorded $2.7 million of current liabilities 
and $14.0 million of other noncurrent liabilities to reflect the estimated 
future costs associated with environmental matters. Management believes that 
the outcome of known environmental contingencies will not have a material 
effect on the operations, financial condition or liquidity of the Company.

Seasonality and Quarterly Financial Data

    The Company experiences a substantial amount of seasonality in sales of
the various products. The result of this seasonality is that net sales and
operating income are generally higher in the third and fourth fiscal quarters
and lower in the first and second fiscal quarters of each fiscal year.

    Sales of highway deicing salt in particular, are seasonal in nature,
varying with the winter conditions in areas where the product is used.
Following industry practice, the Company and its customers stockpile
sufficient quantities of ice control salt in the first three fiscal quarters
to meet estimated requirements for the winter season. Soda ash sales to the
glass container industry tend to be somewhat seasonal due to stronger summer
demand for beverages packaged in glass bottles. Most of the Company's
specialty potash sales are made between December and March in order to meet
the spring planting season requirements.    

The table below reflects the seasonality of the Company's business.


                                    Fiscal Year 1996 by Quarter
                          -----------------------------------------------
                            1st          2nd          3rd          4th    
                          --------    ---------    ----------   ---------
                                           (in thousands)
  
Operating Data:
Net sales................ $ 87,379    $ 93,018     $ 133,461    $ 161,617
Gross profit.............   10,483      19,101        40,131       54,719
Operating income (loss)..   (3,749)      5,796        24,882       26,188
Interest expense.........   20,042      20,910        21,479       22,507
Net income (loss)........  (21,146)    (12,426)        1,957        2,873


                            Fiscal Year 1997
                          --------------------  
                          1st Quarter          
                          -----------      
                          (in thousands)
Operating Data:
Net sales................ $ 99,581
Gross profit.............   18,103    
Operating income.........    4,138   
Interest expense.........   20,533    
Net loss.................  (15,092)   




<PAGE> 20
PART II. OTHER INFORMATION

Item 1. Legal Proceedings

        None

Item 6. Exhibits and Reports on Form 8-K

(a) All exhibits otherwise required in connection with this quarterly report 
    on Form 10-Q have heretofore been filed with the Securities and Exchange 
    Commission except as follows:

Exhibit No.  Description of Exhibit
- - -----------  ----------------------
10.1         Form of Participation Agreement dated as of July 15, 1996 among 
             NACC, Harris, [Owner Participant]/[Owner Participant, OP 
             Guarantor] and U.S. Trust Company of California, N.A., as Owner 
             Trustee (1)

10.2         Form of Annex A to Participation Agreement (1)

10.3         Form of Facility Lease dated as of July 15, 1996 between U.S. 
             Trust Company of California, N.A.,as Owner Trustee as Lessor,
             and NACC, as Lessee (1)

10.4         Form of Guaranty Agreement dated as of July 15, 1996 by Harris 
             for the benefit of [Owner Participant]/[Owner Participant,OP 
             Guarantor] (2) and U.S. Trust Company of California, N.A., as 
             Owner Trustee (1)

(1)  To effect the sale and leaseback, NACC and Harris entered into two 
     separate but substantially identical sets of documents, each set for a
     different institutional investor.

(2)  One institutional investor chose to use an owner participant and a parent 
     guarantor ("[OP Guarantor]").

(b) Reports on Form 8-K          

    None


SIGNATURE

Pursuant to the requirements of the Securities Exchange Act of 1934, the
registrant has duly caused this report to be signed on its behalf by the
undersigned thereunto duly authorized.


                                   Harris Chemical North America, Inc.
                                              (Registrant)


Date:  August 13, 1996                    Emanuel J. Di Teresi
       ---------------                 --------------------------
                                         (Emanuel J. Di Teresi)
                                       (Senior Vice President and
                                        Chief Financial Officer)
                                       (Chief Accounting Officer)























<TABLE> <S> <C>

<ARTICLE> 5
<LEGEND>
This schedule contains summary financial information extracted from the
Consolidated Balance Sheet at June 29, 1996 (Unaudited) and the Consolidated
Statement of Operations for the Thirteen Weeks Ended June 29, 1996 (Unaudited)
and is qualified in its entirety by reference to such financial statements.
</LEGEND>
<MULTIPLIER> 1,000
       
<S>                             <C>
<PERIOD-TYPE>                   OTHER
<FISCAL-YEAR-END>                          MAR-29-1997
<PERIOD-END>                               JUN-29-1996
<CASH>                                               0
<SECURITIES>                                         0
<RECEIVABLES>                                   85,011
<ALLOWANCES>                                     1,143
<INVENTORY>                                    117,210
<CURRENT-ASSETS>                               214,994
<PP&E>                                         674,652
<DEPRECIATION>                                 278,696
<TOTAL-ASSETS>                                 642,063
<CURRENT-LIABILITIES>                          123,675
<BONDS>                                        685,000
                                0
                                          0
<COMMON>                                             0
<OTHER-SE>                                   (295,972)
<TOTAL-LIABILITY-AND-EQUITY>                   642,063
<SALES>                                         99,581
<TOTAL-REVENUES>                                99,581
<CGS>                                           81,478
<TOTAL-COSTS>                                   81,478
<OTHER-EXPENSES>                                     0
<LOSS-PROVISION>                                     0
<INTEREST-EXPENSE>                              20,533
<INCOME-PRETAX>                               (15,161)
<INCOME-TAX>                                      (69)
<INCOME-CONTINUING>                           (15,092)
<DISCONTINUED>                                       0
<EXTRAORDINARY>                                      0
<CHANGES>                                            0
<NET-INCOME>                                  (15,092)
<EPS-PRIMARY>                                        0
<EPS-DILUTED>                                        0
        

</TABLE>

                         FORM OF PARTICIPATION AGREEMENT
                         -------------------------------

                             PARTICIPATION AGREEMENT
                           (Searles Valley Trust 1996)

                            dated as of July 15, 1996

                                      among

                        NORTH AMERICAN CHEMICAL COMPANY,


                      HARRIS CHEMICAL NORTH AMERICA, INC.,


                              [OWNER PARTICIPANT],


                                       and

                     U.S. TRUST COMPANY OF CALIFORNIA, N.A.,

               not in its individual capacity, except as otherwise
                    expressly provided herein, but solely as
                  owner trustee under the Trust Agreement that
                       creates the trust identified under
                                the title hereof.



<PAGE>




                                TABLE OF CONTENTS

     Section                                                               Page
     -------                                                               ----

                                  INTRODUCTION                                1

                                    ARTICLE I

                                   DEFINITIONS
                                                                              2


                                   ARTICLE II

                                     CLOSING
                                                                              2
     Section 2.1  Transaction...............................................  2
     Section 2.2  Closing Date Notice.......................................  4


                                   ARTICLE III

                                   ADJUSTMENTS
                                                                              4
     Section 3.1  Assumptions in Computing Interim and Basic Rent...........  4
     Section 3.2  Making of Adjustments.....................................  4
     Section 3.3  Procedures for Adjustments................................  5
     Section 3.4  Adjustment to the Stated Amount...........................  6
     Section 4.1  Conditions Precedent to Obligations of Owner Participant
                  and Owner Trustee.........................................  6
     Section 4.2  Additional Conditions Precedent to Obligations of Owner
                  Participant............................................... 12
     Section 4.3  Conditions Precedent to Obligations of NACC and HCNA...... 13


                                    ARTICLE V

                         REPRESENTATIONS AND WARRANTIES
                                                                             15
     Section 5.1  Representations and Warranties of NACC.................... 15
     Section 5.2  Representations and Warranties of HCNA.................... 25
     Section 5.4  [Reserved.]............................................... 30
     Section 5.5  Representations and Warranties of Trust Company and Owner
                  Trustee................................................... 30

                                      - i -

<PAGE>


                                TABLE OF CONTENTS

     Section                                                               Page
     -------                                                               ----


     Section 5.6  Offerings by Parties...................................... 31
     Section 5.7  Representations and Warranties Regarding Investment....... 32


                                   ARTICLE VI

                                    COVENANTS
                                                                             32
     Section 6.1  Covenants of NACC......................................... 32
     Section 6.2  Covenants of HCNA During Basic Term....................... 45
     Section 6.3  Covenants of HCNA After Basic Term........................ 55
     Section 6.4  Covenants of Owner Participant and Owner Trustee.......... 57
     Section 6.5  Special Termination Event................................. 61


                                   ARTICLE VII

                                 INDEMNIFICATION                             62
     Section 7.1  General Indemnity......................................... 62
     Section 7.2  Exceptions................................................ 63
     Section 7.3  Procedures................................................ 64
     Section 7.4  General Tax Indemnity..................................... 66
     Section 7.5  Survival.................................................. 73


                                  ARTICLE VIII

                    LIMITATION OF LIABILITY OF OWNER TRUSTEE
                                                                             73


                                   ARTICLE IX

                                  MISCELLANEOUS
                                                                             74
     Section 9.1  Notices................................................... 74
     Section 9.2  Counterparts; Reproduction of Documents................... 76
     Section 9.3  Further Assurances........................................ 76
     Section 9.4  Quiet Enjoyment........................................... 76
     Section 9.5  Survival.................................................. 76


                                     - ii -

<PAGE>


                                TABLE OF CONTENTS

     Section                                                               Page
     -------                                                               ----


     Section 9.6  Confidentiality........................................... 76
     Section 9.7  Intentionally Omitted..................................... 77
     Section 9.8  Amendments................................................ 77
     Section 9.9  Headings, etc............................................. 78
     Section 9.10 Successors and Assigns.................................... 78
     Section 9.11 Governing Law; Consent to Jurisdiction; Service of
                  Process; Waiver of Immunities............................. 78
     Section 9.12 Severability.............................................. 79
     Section 9.13 Waiver of Trial by Jury................................... 79
     Section 9.14 Obligation of Owner Participant to Return Letter of
                  Credit.................................................... 79




                                     - iii -

<PAGE>



EXHIBITS

Annex A           -        Schedule of Definitions

Exhibit A         -        Form of Argus Utility Bill of Sale
Exhibit B         -        Form of Argus Utility Deed of Improvements
Exhibit C         -        Form of Lease
Exhibit D         -        Form of Site Lease
Exhibit E         -        Form of Power Contract Trust Agreement
Exhibit F         -        Form of Power Contract Assignment
Exhibit G         -        Reserved
Exhibit H         -        Form of Trust Agreement
Exhibit I         -        Form of Tax Indemnity Agreement
Exhibit J         -        Reserved
Exhibit K         -        Form of HCNA Guaranty
Exhibit L         -        Form of OP Parent Guaranty
Exhibit M         -        Form of Services Agreement
Exhibit N         -        Form of Letter of Credit
Exhibit O         -        Form of Memorandum of Lease
Exhibit P         -        Form of Memorandum of Site Lease (Parcel A-1)
Exhibit P-1       -        Form of Memorandum of Site Lease (Parcel B-1)
Exhibit P-2       -        Form of Easement
Exhibit P-3       -        Form of License
Exhibit Q         -        Form of Opinion of Special Counsel to NACC and HCNA
Exhibit R         -        Form of Opinion of Special California Counsel to NACC
                           and HCNA
Exhibit S         -        Form of Opinion of Special Counsel to Owner Trustee
                           and Power Contract Trustee
Exhibit T         -        Form of Opinion of Special Counsel to Owner
                           Participant
Exhibit U         -        Form of Opinion of General Counsel of Owner
                           Participant
Exhibit V         -        Form of Opinion of Special California Counsel to
                           Owner Participant
Exhibit W-1       -        Form of Special New York Counsel to Letter of Credit
                           Issuer
Exhibit W-2       -        Form of Special English Counsel to Letter of Credit
                           Issuer
Exhibit X         -        Form of Babcock & Brown, Inc. Letter
Exhibit Y         -        Form of Lessor Security Agreement
Exhibit Z         -        Form of Account Bank Agreement
Exhibit AA        -        Form of Transfer Agreement
Exhibit BB        -        HCNA Letter

Schedule I        -        Pricing Assumptions
Schedule II       -        Certain Permitted Liens
Schedule 4.1(l)   -        Environmental Approvals
Schedule 4.1(o)   -        Filings
Schedule 5.1(c)   -        Consents


                                     - iv -

<PAGE>



Schedule 5.1(q)   -        Condition of Facility
Schedule 5.1(u)   -        Environmental Compliance
Schedule 5.1(aa)  -        Restrictions and Covenants
Schedule 5.1(bb)  -        Pending Assessments


                                      - v -

<PAGE>



                             PARTICIPATION AGREEMENT
                           (Searles Valley Trust 1996)

                  PARTICIPATION  AGREEMENT  dated  as of  July  15,  1996  (this
"Participation Agreement") among (i) NORTH AMERICAN CHEMICAL COMPANY, a Delaware
corporation  ("NACC"),  (ii) HARRIS  CHEMICAL  NORTH  AMERICA,  INC., a Delaware
corporation ("HCNA"), (iii) [OWNER PARTICIPANT],  a New York corporation ("Owner
Participant")  and (iv) U.S.  TRUST  COMPANY  OF  CALIFORNIA,  N.A.,  a national
banking  association,  not in  its  individual  capacity,  except  as  otherwise
expressly  provided  herein but solely as trustee under the Trust Agreement that
creates the trust identified under the title hereof ("Owner Trustee").

                                  INTRODUCTION

                  A. Upon purchasing the Undivided  Interest in the Facility and
entering into the Site Lease, Owner Trustee will lease the Undivided Interest in
the Facility and sublease the Leasehold Estate to NACC pursuant to the Lease.

                  B. Subject to the terms and conditions  hereof, on the Closing
Date the  parties  contemplate  that (i) NACC will  execute and deliver to Owner
Trustee the Argus  Utility Bill of Sale and Argus  Utility Deed of  Improvements
pursuant to which NACC will grant and convey to Owner Trustee  good,  marketable
(to the extent the same constitutes real property) and indefeasible title to the
Undivided  Interest in the  Facility;  (ii) Owner Trustee will purchase from and
pay NACC for the  Undivided  Interest  in the  Facility  pursuant  to the  Argus
Utility  Bill of Sale and Argus  Utility Deed of  Improvements;  (iii) NACC will
lease the Undivided  Interest in the Site to Owner Trustee  pursuant to the Site
Lease,  will enter into the Easement and the License with Owner Trustee and will
enter into the Services Agreement with Owner Trustee and the Other Owner Trustee
providing for, among other things, the provision of certain facilities, services
and supplies necessary for the operation of the Facility; (iv) Owner Trustee and
NACC will enter into the Lease providing for the lease of the Undivided Interest
in the Facility and the sublease of the Leasehold Estate; (v) Owner Participant,
Other Owner  Participant  and Power  Contract  Trustee will enter into the Power
Contract  Trust  Agreement;  (vi) Owner  Trustee,  Other  Owner  Trustee,  Power
Contract  Trustee  and NACC  will  enter  into  the  Power  Contract  Assignment
providing for the  assignment of the Power Purchase  Agreements;  (vii) NACC and
Owner Participant will enter into the Tax Indemnity  Agreement;  and (viii) HCNA
will  execute  and  deliver  the  HCNA  Guaranty  to  Owner  Trustee  and  Owner
Participant.

                  NOW,  THEREFORE,  in  consideration  of the mutual  agreements
herein contained and other good and valuable consideration,  receipt of which is
hereby acknowledged, the parties hereto hereby agree as follows:


                                        1

<PAGE>



                                    ARTICLE I

                                   DEFINITIONS

                  Capitalized  terms used (including  those used in the forgoing
recitals)  but not defined  herein shall have the  meanings  assigned to them in
Annex A hereto,  which Annex A shall for all  purposes  constitute  part of this
Participation Agreement and shall be subject to amendment in accordance with the
terms hereof.  All references to Sections,  Schedules and Exhibits herein are to
Sections,   Schedules  and  Exhibits  to  this  Participation  Agreement  unless
otherwise indicated.


                                   ARTICLE II

                                     CLOSING

                  Section 2.1  Transaction.  Subject to the terms and conditions
hereof, the following  transactions (the "Closing") shall occur and be closed at
the  offices  of  Hunton  &  Williams,  200  Park  Avenue,  New  York,  New York
10166-0136, or such other location in New York as may be determined by the Owner
Participant  and NACC, at 11:00 a.m., New York time, on the Closing Date,  which
transactions shall be deemed to have occurred simultaneously.

                  (a)  Owner Participant's  Commitment.  Owner Participant shall
         contribute  to Owner  Trustee an amount equal to the Facility Cost (the
         "Commitment"),  and Owner  Participant  hereby  agrees  that its making
         available  the  amount  of its  Commitment  to  Owner  Trustee  for the
         purchase of an Undivided  Interest in the Facility in  accordance  with
         the terms of this Section 2.1 shall  constitute,  without  further act,
         authorization  or  direction  by Owner  Participant  to Owner  Trustee,
         subject,  to the  conditions  set forth in Sections  4.1 and 4.2 having
         been fulfilled to the  satisfaction  of Owner  Participant or waived by
         Owner Participant,  to take the actions specified in Section 2.1 of the
         Trust Agreement with respect to the Undivided Interest in the Facility.

                  (b)  Purchase  and  Lease of  Facility.  Owner  Trustee  shall
         purchase from NACC, and NACC shall sell to Owner Trustee, the Undivided
         Interest in the Facility for an aggregate  purchase  price equal to the
         Facility  Cost,  and to  evidence  such sale,  NACC shall  execute  and
         deliver to Owner Trustee the Argus  Utility Bill of Sale  substantially
         in the form of  Exhibit A and the Argus  Utility  Deed of  Improvements
         substantially  in the form of  Exhibit  B; and NACC and  Owner  Trustee
         shall  enter  into the Lease  substantially  in the form of  Exhibit C,
         pursuant to which Owner Trustee  immediately  shall lease the Undivided
         Interest in the Facility to NACC.

                  (c)  Purchase,  Lease  and  Sublease  of Site.  NACC and Owner
         Trustee  shall enter into the Site Lease  substantially  in the form of
         Exhibit D pursuant to which NACC shall lease an  Undivided  Interest in
         the Site to  Owner  Trustee;  and  Owner  Trustee  shall  sublease  the
         Leasehold Estate to NACC pursuant to the Lease.


                                        2

<PAGE>




                  (d)  Power Contract Trust Agreement.  Owner  Participant,  the
         Other Owner Participant and Power Contract Trustee shall enter into the
         Power Contract Trust Agreement substantially in the form of Exhibit E.

                  (e)  Assignment   and   Sub-Assignment   of   Power   Purchase
         Agreements.  NACC and Power Contract Trustee shall enter into the Power
         Contract Assignment  substantially in the form of Exhibit F pursuant to
         which NACC shall  assign its  right,  title and  interest  in the Power
         Purchase  Agreements  to Power  Contract  Trustee;  and Power  Contract
         Trustee shall then sub-assign back its right, title and interest in the
         Power Purchase  Agreements to NACC, which assignment and sub-assignment
         shall be consented to by the Power Purchaser.

                  (f)  Other  Agreements.  The  Persons  identified  therein  as
         parties thereto shall execute and deliver to each other the following:

                             (i)    the  Trust  Agreement  substantially  in the
                  form of Exhibit H;

                             (ii)   the Tax Indemnity Agreement substantially in
                  the form of Exhibit I;

                             (iii)  the HCNA Guaranty  substantially in the form
                  of Exhibit K;

                             (iv)   [Reserved.];

                             (v)    the Services Agreement  substantially in the
                  form of Exhibit M;

                             (vi)   the  Letter of Credit  substantially  in the
                  form of Exhibit N;

                             (vii)  the Memorandum of Lease substantially in the
                  form of Exhibit O;

                             (viii) the  Memorandum  of Site Lease  (Parcel A-1)
                  substantially in the form of Exhibit P;

                             (ix)   the  Memorandum  of Site Lease  (Parcel B-1)
                  substantially in the form of Exhibit P-1;

                             (x)    the  Easement  substantially  in the form of
                  Exhibit P-2; and

                             (xi)   the  License  substantially  in the  form of
                  Exhibit P-3.

                  (g)  Payment.  Upon receipt of Owner Participant's  Commitment
         described in Section 2.1(a), Owner Trustee shall pay an amount equal to
         Facility Cost to NACC, in immediately  available  funds, at its account
         specified in Section 9.1 in consideration of


                                        3

<PAGE>



         the sale of the  Undivided  Interest in the Facility and the  Undivided
         Interest  in the  Power  Purchase  Agreements  assigned  to  the  Power
         Contract  Trustee pursuant to the Power Contract  Assignment,  and NACC
         acknowledges and agrees that the making of the payment  contemplated by
         Section  2.1(b)  satisfies all  obligations to such party in respect of
         any such payments due to it at the Closing.  The  obligations  of NACC,
         HCNA,  Owner  Trustee and Owner  Participant  under this Section 2.1 or
         elsewhere in the Operative Documents shall be separate, independent and
         several, not joint, obligations and none of the parties shall be liable
         or responsible  for the acts or defaults of any other party  hereunder.
         Transaction Costs shall be payable pursuant to Section 6.4(b).

                  Section  2.2  Closing   Date   Notice.   The  Closing  of  the
transactions  contemplated  by Section 2.1 shall occur on a date  specified in a
notice  from NACC to Owner  Participant  and Owner  Trustee  at least  three (3)
Business Days prior to the scheduled Closing Date; provided,  however,  that the
Closing Date shall be a Business Day occurring on or before July 15, 1996.  Such
notice may be by facsimile  transmission  (promptly confirmed) and shall specify
the proposed Closing Date.


                                   ARTICLE III

                                   ADJUSTMENTS

                  Section 3.1  Assumptions in Computing  Interim and Basic Rent.
The  Interim  and Basic Rent  amounts  set forth in  Schedule  III to the Lease,
Stipulated  Loss  Values set forth in  Schedule  IV to the Lease and the "Stated
Amounts" set forth in Exhibit B to the form of Letter of Credit  attached hereto
as  Exhibit  N,  were  calculated  by  Owner  Participant  on the  basis  of the
assumptions  set forth in  Section 3 of the Tax  Indemnity  Agreement  (the "Tax
Assumptions") and, in addition thereto,  the assumptions set forth in Schedule I
(the "Pricing Assumptions").

                  Section 3.2 Making of Adjustments.  In the event that:

                  (a)  on or prior to the Closing Date (i) there occurs a change
         in the Tax Assumptions or the Pricing  Assumptions or (ii) there occurs
         a Tax Law Change that is enacted after April 26, 1996.

                  (b)  the Closing Date is other than July 15 or the Transaction
         Costs are  greater  or less than the  amount of  Transaction  Costs set
         forth in the Pricing Assumptions; or

                  (c)  NACC becomes  obligated to make a tax  indemnity  payment
         under  the Tax  Indemnity  Agreement  which  is to be paid  through  an
         adjustment to Basic Rent;

then, Owner  Participant shall recompute,  upward or downward,  the schedules of
(x) Interim and Basic Rent and  Stipulated  Loss Values as shall be necessary to
preserve Owner  Participant's Net Economic Return while, to the extent possible,
minimizing the present value to NACC of the


                                        4

<PAGE>



Interim and Basic Rent  payments  (discounted  at the Discount  Rate) during the
remainder  of the Lease Term and (y) Stated  Amount in  accordance  with Section
3.4; provided, however, that any Adjustment as a result of an event described in
clause  (a)  above  shall  be made on or  prior to the  Closing  Date.  Any such
recomputation (i) shall be made using the same methodology and assumptions which
were  used in the  original  computation  of the  Interim  and  Basic  Rent  and
Stipulated Loss Value Schedules  attached to the Lease on the Closing Date, (ii)
shall be consistent with the Pricing Assumptions and Tax Assumptions (other than
any Pricing  Assumptions or Tax Assumptions the incorrectness of which gave rise
to such  recomputation  or to a prior  recomputation),  (iii) shall  satisfy the
provisions  of  Revenue   Procedures  75-21  and  75-28  and  any  successor  or
supplemental procedure or administrative guidance relating to the subject matter
of such procedures to the same extent,  if any, as such schedules  complied with
or satisfied  such revenue  procedures or guidance on the date hereof,  and (iv)
shall be made in a manner designed to comply with Section 467 of the Code or any
successor  provision  thereto  and  any  regulations  thereunder  or  under  any
successor  or  supplemental  provision  of  federal  income  tax law to the same
extent,  if  any,  as  such  schedules  complied  with or  satisfied  such  Code
provisions  and  regulations  on the  date  hereof,  except  in the  case  of an
adjustment  pursuant to clause (c),  in which case such  adjustment  must comply
with  such  provisions  of  the  Code  and  the  regulations  thereunder  as are
applicable at the time of such adjustment.

                  Section 3.3 Procedures for  Adjustments.  Any Adjustments made
pursuant to this Article III shall be made by Owner  Participant and the results
of such  Adjustments  shall be delivered  promptly to NACC which results  shall,
subject to this Section 3.3, be binding upon NACC if Owner Participant  confirms
to NACC that the assumption and methods of calculation  employed in the original
calculations were used  consistently in the Adjustments,  except as contemplated
within this Article III. Within thirty (30) days of receipt of the results of an
Adjustment, if NACC shall disagree with such Adjustment, NACC may demand that an
independent  public accounting (or lease advising) firm of national standing and
reputation selected by Owner Participant and reasonably  acceptable to NACC (the
"Verifier")  verify  whether  such  Adjustment  is  correct.  In  verifying  the
Adjustment,  such Verifier (but not NACC) shall have access to information  (but
not  the  tax  returns),  subject  to  a  confidentiality  agreement  reasonably
satisfactory to Owner  Participant,  necessary to verify such  Adjustment.  Both
NACC and the Owner  Participant  shall  have the right to  communicate  with the
Verifier and to submit  supporting  information  and data. If the adjustments to
Interim Rent,  Basic Rent and Stipulated Loss Values  calculated by the Verifier
are different  than those  calculated  by the Owner  Participant,  then,  absent
manifest   error,   the  Lease  shall  be  amended  to  reflect  the  Verifier's
adjustments.  If the sum of the present values, discounted at the Discount Rate,
of the  Interim  Rent and all Basic Rent  scheduled  to be paid during the Basic
Term divided by the Facility Cost and  expressed as a percentage,  as calculated
by the  Verifier,  is more than 15 basis  points  less  than the sum of  present
values, discounted and calculated in the same manner, of the Owner Participant's
calculation,  then the Owner  Participant  shall pay the reasonable cost of such
verification. Otherwise, NACC shall pay the reasonable cost of verification. The
determination  of any  Adjustment  hereunder  shall  be  set  forth  in a  Lease
Supplement executed and delivered by Owner Trustee and NACC; provided,  however,
that the failure so to set forth such  Adjustment or execute and deliver a Lease
Supplement  shall not affect the validity or  effectiveness  of such Adjustment.
The parties hereto agree that the sole  responsibility  of the Verifier shall be
to verify


                                        5

<PAGE>



the  Adjustments  and that matters of  interpretation  of this  Agreement or any
other  Operative  Document  shall  not be  within  the  scope of the  Verifier's
responsibilities.

                  Section 3.4 Adjustment to the Stated Amount.  If an Adjustment
is made as a result of an event described in Section 3.2(c) as a result of a tax
indemnity payment under the Tax Indemnity  Agreement in excess of $750,000,  the
Owner Participant shall also recompute the "Stated Amounts" set forth in Exhibit
B to the form of Letter of Credit to equal the sum of (I)  $1,000,000  plus (II)
the product of (a)  $5,860,441  multiplied by (b) the quotient of (1) the annual
payment  amount of Basic Rent plus  Supplemental  Rent then due and owing,  with
respect  to  payments  made under the Tax  Indemnity  Agreement,  following  the
adjustment  thereof  pursuant to Section 3.2 over (2) $5,586,857;  provided that
the  Stated  Amount  shall not  exceed  the  aggregate  amount of the  remaining
scheduled payments of Basic Rent under the Lease.


                                   ARTICLE IV

                              CONDITIONS PRECEDENT

                  Section  4.1  Conditions  Precedent  to  Obligations  of Owner
Participant  and Owner Trustee.  The obligation of Owner  Participant  and Owner
Trustee to  consummate  the  transactions  contemplated  by Section 2.1 shall be
subject to the fulfillment to the  satisfaction  of (including,  with respect to
writings,  such writings being in form and substance reasonably  satisfactory to
the  addressee  or  beneficiary   thereof),  or  waiver  in  writing  by,  Owner
Participant or Owner Trustee,  as appropriate,  prior to or on the Closing Date,
of the following  conditions  precedent (except that the obligation of any party
shall not be subject to such party's own performance or compliance):

                  (a)  Authorization,  Execution and Delivery of Documents.  All
         of the Lease Financing Documents (other than the Account Bank Agreement
         and the Lessor  Security  Agreement)  shall have been duly  authorized,
         executed and delivered by the respective  parties thereto,  shall be in
         full force and  effect on the  Closing  Date and each such party  shall
         have performed and complied with all agreements and conditions  therein
         required to be  performed  or complied  with on or prior to the Closing
         Date.

                  (b)  No Default.  Other than HCNA's failure to deliver audited
         financial statements with respect to HCNA's fiscal year ended March 30,
         1996 to the holders of its Debt,  no event shall have  occurred  and be
         continuing  that  constitutes a Default or Event of Default or no event
         of default or event or condition which would, with the giving of notice
         or the  passage  of time and  without  giving  effect to any  waiver or
         forbearance with respect thereto constitute an event of default,  shall
         have  occurred or be  continuing  under any  Operative  Document or any
         agreement  under  which  NACC or HCNA has  borrowed  money in excess of
         $5,000,000.

                  (c)  Notice.  Owner  Participant  and Owner Trustee shall have
         received the Closing Date Notice.


                                        6

<PAGE>




                  (d)  Illegality,  etc. No change shall have occurred after the
         date  of  the  execution  and  delivery  of  this  Agreement  in  Legal
         Requirements  thereunder  or  interpretations  thereof by any Authority
         that would (i) make it illegal for Owner  Participant  or Owner Trustee
         to  participate  in the  transactions  contemplated  by  the  Operative
         Documents or (ii)  reasonably be expected to have an adverse  effect on
         the  Facility,  the  Complex,  any  Material  Participant  or the Owner
         Participant's participation in the transaction.

                  (e)  No  Violation  of   Applicable   Law.  The   transactions
         contemplated  by the  Operative  Documents  shall not violate any Legal
         Requirements.

                  (f)  Litigation.  No  action  or  proceeding  shall  have been
         instituted,  nor shall any Order have been issued by any  Authority  at
         the time of the Closing Date to set aside, restrain,  enjoin or prevent
         the  consummation  of the  transactions  contemplated  by the Operative
         Documents.

                  (g)  Consents and  Approvals.  All  Approvals  (other than any
         thereof  listed on  Schedule  5.1(c))  required  to be taken,  given or
         obtained,  as the case may be, by or from any Authority,  or by or from
         any trustee or holder of any indebtedness or obligations of NACC or any
         other  Person  which are  required on the Closing  Date for the use and
         operation of the Facility and the Site as contemplated by the Operative
         Documents,  and to the  extent  applicable  to such use,  operation  or
         maintenance of the Facility and the Site, of the Complex,  or otherwise
         in  connection  with the  transactions  contemplated  by the  Operative
         Documents,  shall have been duly taken, given or obtained,  as the case
         may be, shall be satisfactory in form, scope and substance to the Owner
         Participant,  shall be in full  force and  effect on the  Closing  Date
         (and, with respect to Approvals of any Authority, subject to no further
         appeal),  shall  be  adequate  to  authorize  the  consummation  of the
         transactions   contemplated   by  the   Operative   Documents  and  the
         performance by NACC of its  obligations  under such thereof to which it
         is a party.

                  (h)  Title to the Undivided  Interest in the Facility.  On the
         Closing  Date,  after giving  effect to the  transactions  contemplated
         hereby,  Owner  Trustee shall have received  good,  marketable  (to the
         extent the same constitutes  real property) and  indefeasible  title to
         the Undivided  Interest in the Facility,  good and marketable  title to
         the Leasehold  Estate and good and marketable  title to the Easement in
         all cases free and clear of all Liens other than Permitted Liens of the
         type  described in clauses (a), (b), (f), (h) and (l) of the definition
         thereof.

                  (i)  Title  Insurance  and UCC  Reports;  Precautionary  UCCs.
         Owner Trustee shall have  received  (and Owner  Participant  shall have
         received a copy of) the following:

                                    (i)  an  ALTA  leasehold   policy  of  title
                  insurance issued by the Title Underwriter, in prescribed form,
                  with  such   co-insurance/re-insurance   supplements   as  are
                  acceptable  to  Owner   Participant,   and   containing   such
                  endorsements  as Owner  Participant  may  reasonably  require,
                  including without


                                        7

<PAGE>



                  limitation a California  Subdivision  Map Act  endorsement  in
                  acceptable form,  subject only to standard printed  exceptions
                  to a leasehold  policy of title  insurance to the extent that,
                  pursuant  to Legal  Requirements,  such  exceptions  cannot be
                  removed  or  insured  against  by  endorsement  or  otherwise,
                  Permitted  Liens of the type  described  in clause  (h) of the
                  definition  thereof  and  such  other  exceptions  as shall be
                  approved  by Owner  Participant  in its sole  discretion.  The
                  leasehold  policy shall insure the Owner  Trustee's  Leasehold
                  Estate to be good and marketable;

                                    (ii)  an  ALTA   owner's   policy  of  title
                  insurance issued by the Title Underwriter, in prescribed form,
                  with  such   co-insurance/re-insurance   supplements   as  are
                  acceptable  to  Owner   Participant,   and   containing   such
                  endorsements  as Owner  Participant  may  reasonably  require,
                  subject only to standard printed exceptions to an owner policy
                  of title  insurance  to the  extent  that,  pursuant  to Legal
                  Requirements,  such  exceptions  cannot be  removed or insured
                  against by  endorsement or otherwise,  Permitted  Liens of the
                  type  described  in clause (h) of the  definition  thereof and
                  such  other   exceptions   as  shall  be   approved  by  Owner
                  Participant in its sole discretion.  Such owner's policy shall
                  insure Owner Trustee's  Undivided  Interest in the Facility to
                  be good,  marketable (to the extent the same  constitutes real
                  property) and indefeasible;

                                    (iii)  The  policies  referenced  in (i) and
                  (ii) may be combined into a single  policy.  The policy amount
                  shall  be  $75,000,000.  The  policy  shall  also  insure  the
                  Easement to be good and  marketable in form  acceptable to the
                  Owner Participant;

                                    (iv)  acceptable   Uniform  Commercial  Code
                  financing  statement filing reports with respect to NACC dated
                  as close to the Closing Date as practicable from the Office of
                  the  Secretary  of State  of  California  and the  appropriate
                  filing offices in San Bernardino  County,  California and Kern
                  County, California;

                                    (v)  acceptable   Uniform   Commercial  Code
                  financing  statement filing reports with respect to NACC dated
                  as close to the Closing Date as practicable from the Office of
                  the Secretary of State of Kansas;

                                    (vi)  acceptable   Uniform  Commercial  Code
                  financing  statement filing reports with respect to NACC dated
                  as close to the Closing Date as practicable from the Office of
                  the Secretary of State of New York and the appropriate  filing
                  offices in New York County, New York; and

                                    (vii) Precautionary UCC financing statements
                  covering  the rights of the Owner  Trustee in the Lease  shall
                  have been  executed and  delivered by the Lessee as debtor for
                  the benefit of the Owner Trustee as secured party, and in each
                  case duly filed in all places as, in the reasonable opinion of
                  counsel for the


                                        8

<PAGE>



                  Owner  Participant  and the Owner  Trustee,  are  necessary or
                  desirable to perfect said security or other interests.

                  (j)  Survey.  Owner Trustee shall have received the following:
         (i) an ALTA/ACSM  Land Title Survey of the Facility,  the Easement Site
         and the Site dated no more than fourteen (14) days prior to the Closing
         Date,  prepared  by  a  licensed  land  surveyor,  certified  to  Owner
         Participant,  Owner Trustee and the Title  Underwriter and satisfactory
         to Owner Participant, (ii) a copy of the recorded Parcel Map 14061 (the
         "Parcel Map"),  (iii) an ALTA/ACSM Land Title Survey dated no more than
         fourteen  (14) days prior to the Closing  Date,  prepared by a licensed
         land surveyor,  certified to Owner  Participant,  Owner Trustee and the
         title insurers and  satisfactory  to Owner  Participant,  depicting the
         proposed  amendment  to  Parcel  4 of  the  Parcel  Map,  and  (iv)  an
         uncertified,  map depicting the approximate  location of the Complex in
         the form previously delivered to Owner Trustee.

                  (k)  Environmental Report. Owner Participant and Owner Trustee
         shall  have  received  reports,  addressed  to each of them,  which are
         satisfactory in form and substance,  from the Environmental Consultants
         regarding the environmental condition of the Facility, the Site and the
         Complex.

                  (l)  Environmental  Approvals.  Owner  Participant  and  Owner
         Trustee  shall  have  received  Schedule  4.1(l),   setting  forth  all
         Approvals required on the Closing Date under Environmental Laws for the
         use,  operation  and  maintenance  of the  Facility  and  the  Site  as
         contemplated by the Operative  Documents and, to the extent  applicable
         to such use,  operation or maintenance of the Facility or the Site, the
         Complex.

                  (m)  Engineering Report. Owner Participant shall have received
         (i) satisfactory reports from the Engineering  Consultant regarding the
         Facility and the Site.

                  (n)  Soda Ash Report.  Owner  Participant  shall have received
         satisfactory  reports from the Soda Ash  Consultant  regarding the soda
         ash industry and the business of NACC.

                  (o)  Filings and Recordings.  Satisfactory  arrangements shall
         have been made to file and  record  the  documents  listed on  Schedule
         4.1(o) in the filing  offices  described in Schedule  4.1(o) and to pay
         all filing fees in connection therewith.

                  (p)  Insurance.  Insurance  complying  with the  provisions of
         Section 9 of the Lease  shall be in full  force  and  effect  and Owner
         Participant  and Owner Trustee shall have received a certificate  of an
         independent  insurance  broker dated the Closing Date,  describing  the
         insurance  obtained  in  accordance  with  Section  9 of the  Lease and
         stating  that such  insurance  is in full force and effect and that all
         premiums  then due and  payable  thereon  have been  paid  and,  in the
         opinion of such broker,  such insurance complies with the provisions of
         the Lease.  Owner  Participant  and Owner  Trustee  shall have received
         certificates of insurance in accordance with Section 9 of the Lease.


                                        9

<PAGE>




                  (q)  Additional Officer's  Certificates.  On the Closing Date,
         the following  statements shall be true and Owner Participant and Owner
         Trustee,  as the  case  may  be,  shall  have  received  the  following
         Officer's Certificates:

                                    (i) Owner  Trustee  shall have  received  an
                  Officer's Certificate of Owner Participant,  dated the Closing
                  Date, stating that (A) the  representations  and warranties of
                  Owner  Participant  contained in Sections 5.3, 5.6 and 5.7 are
                  true and accurate on and as of the Closing Date as though made
                  on and as of the Closing  Date and (B) Owner  Participant  has
                  performed  and complied  with all  agreements  and  conditions
                  required  to be  performed  or  complied  with by it under the
                  Operative Documents on or before the Closing Date;

                                    (ii)  [Reserved.];

                                    (iii) Owner  Trustee  and Owner  Participant
                  shall have received an Officer's  Certificate  of NACC,  dated
                  the Closing  Date,  stating that (A) the  representations  and
                  warranties of NACC  contained in the  Operative  Documents and
                  any  letter,  certificate  or  other  instrument  executed  in
                  connection  therewith  are true and  correct  on and as of the
                  Closing  Date as though made on and as of the Closing Date and
                  (B) NACC has performed and complied  with all  agreements  and
                  conditions herein contained which are required to be performed
                  or complied  with by it under the  Operative  Documents  on or
                  before the Closing Date;

                                    (iv)  Owner  Trustee  and Owner  Participant
                  shall have received an Officer's  Certificate  of HCNA,  dated
                  the Closing  Date,  stating that (A) the  representations  and
                  warranties of HCNA  contained in the  Operative  Documents and
                  any letter,  certificate or instrument  executed in connection
                  therewith  are true and correct on and as of the Closing  Date
                  as though made on and as of the Closing  Date and (B) HCNA has
                  performed  and complied  with all  agreements  and  conditions
                  herein  contained  which  are  required  to  be  performed  or
                  complied with by it under the Operative Documents on or before
                  the Closing Date;

                                    (v) Owner Participant shall have received an
                  Officer's  Certificate  of Owner  Trustee,  dated the  Closing
                  Date, stating that (A) the  representations  and warranties of
                  Owner  Trustee  contained  in  Sections  5.5  and  5.6 of this
                  Participation  Agreement  and  Section 5 of the Lease are true
                  and  correct on and as of the  Closing  Date as though made on
                  and as of the Closing Date and (B) Owner Trustee has performed
                  and  complied  with  all  agreements  and  conditions   herein
                  contained  which are required to be performed or complied with
                  by it under the  Operative  Documents on or before the Closing
                  Date; and

                                    (vi) Owner  Participant  shall have received
                  an Officer's Certificate of the Power Contract Trustee,  dated
                  the Closing  Date,  stating that (A) the  representations  and
                  warranties of the Power Contract Trustee  contained in Section
                  6(i) of the  Power  Contract  Trust  Agreement  are  true  and
                  correct on and


                                       10

<PAGE>



                  as of the Closing Date as though made on and as of the Closing
                  Date and (B) the Power  Contract  Trustee  has  performed  and
                  complied with all agreements and conditions which are required
                  to be  performed  or complied  with by it under the  Operative
                  Documents on or before the Closing Date.

                  (r)  Resolutions,  Certificates,  etc. Owner  Participant  and
         Owner  Trustee  shall  have  received  a  copy  of  resolutions  of the
         respective  Boards of Directors (or committee thereof having power with
         respect to the  matters  covered by such  resolutions)  of NACC,  HCNA,
         Owner Participant and Owner Trustee,  certified as of such Closing Date
         by the  Secretary  or an  Assistant  Secretary  of  NACC,  HCNA,  Owner
         Participant,  Power Contract  Trustee or Owner  Trustee,  respectively,
         duly authorizing the execution,  delivery and performance by it of each
         Operative  Document  that is to be executed on such Closing Date and to
         which it is a party, together with an incumbency  certificate as to the
         officer or officers authorized to execute and deliver such documents on
         its behalf and certified copies of its certificate of incorporation and
         bylaws or of its other  organizational  documents;  provided,  that the
         receipt by a party of documents and certificates  prepared with respect
         to  itself  shall  not  be  a  condition   precedent  to  such  party's
         obligations hereunder.

                  (s)  No Event of Loss. No Event of Loss or Regulatory Event of
         Loss or event or condition  which  would,  with the giving of notice or
         passage of time,  constitute  an Event of Loss or  Regulatory  Event of
         Loss shall have occurred.

                  (t)  Opinion  of  Special  Counsel  for NACC and  HCNA.  Owner
         Participant and Owner Trustee shall have received an opinion, dated the
         Closing Date, from Winthrop, Stimson, Putnam & Roberts, special counsel
         for NACC, HCNA in the form of Exhibit Q.

                  (u)  Opinion of Special  California Counsel for NACC and HCNA.
         Owner  Participant  and Owner Trustee shall have received an opinion of
         Gresham, Varner, Savage, Nolan & Tilden, special California Counsel for
         NACC and HCNA in the form of Exhibit R.

                  (v)  Opinion of Special  Counsel  for Owner  Trustee and Power
         Contract  Trustee.  Owner  Participant  shall have received an opinion,
         dated the Closing Date, from Carter, Ledyard & Milburn, special counsel
         for Owner Trustee, in the form of Exhibit S.

                  (w)  Opinion of Special Counsel for Owner  Participant.  Owner
         Trustee,  Owner Participant  shall have received an opinion,  dated the
         Closing  Date,  from  Hunton &  Williams,  special  counsel  for  Owner
         Participant, in the form of Exhibit T.

                  (x)  Opinion of General Counsel for Owner  Participant.  Owner
         Trustee  shall have received an opinion,  dated the Closing Date,  from
         Raymond W. Leyden,  Jr., Esq., Senior Counsel of Owner Participant,  in
         the form of Exhibit U.


                                       11

<PAGE>




                  (y)  Opinion  of   Special   California   Counsel   for  Owner
         Participant. Owner Trustee and Owner Participant shall have received an
         opinion,  dated the  Closing  Date,  from  Lillick &  Charles,  special
         California counsel for Owner Participant, in the form of Exhibit V.

                  (z)  Opinion of Special  Counsel for Letter of Credit  Issuer.
         Owner  Participant  and Owner  Trustee  shall have received an opinion,
         dated the Closing Date,  from Simpson  Thacher & Bartlett,  special New
         York counsel for Letter of Credit Issuer in the form of Exhibit W-1 and
         from Lovell White Durrant,  special  English  counsel for the Letter of
         Credit Issuer in the form of Exhibit W-2.

                  (aa) Babcock & Brown Inc.  Certificate.  Owner Participant and
         Owner Trustee shall have received a certificate  in the form of Exhibit
         X from  Babcock & Brown Inc.  dated the  Closing  Date with  respect to
         offerees of interests in the Facility,  the Undivided  Interest therein
         and the Trust Estate.

                  (bb) Payment of Taxes,  etc. All taxes, fees and other charges
         due and payable on or prior to the Closing Date in connection  with the
         execution,  delivery,  recordation  and filing of all the documents and
         instruments,  and performance of the  transactions  contemplated by the
         Operative  Documents  happening on or before the Closing Date, referred
         to in this Participation Agreement shall have been paid in full.

                  (cc) No  Material  Adverse  Change.  There  shall have been no
         material  adverse  change (i) in the business,  operations or financial
         condition  of HCNA or NACC since March 25, 1995 or (ii) with respect to
         the Facility, the Site or the Complex since January 30, 1996.

                  (dd) Closing  Must  Occur  on or  Before  July 15,  1996.  The
         Closing  Date shall be a Business  Day  occurring on or before July 15,
         1996.

                  (ee) Appointment  of  Agent.   Owner  Participant  shall  have
         received  evidence of the  acceptance by CT  Corporation  System of its
         appointment  as  process  agent for HCNA and NACC  pursuant  to Section
         9.11(c).

                  Section 4.2 Additional  Conditions Precedent to Obligations of
Owner  Participant.  The  obligation  of Owner  Participant  to  consummate  the
transactions  contemplated by Section 2.1 shall be subject to the fulfillment to
the satisfaction of (including, with respect to writings, such writings being in
form and  substance  reasonably  satisfactory  to the  addressee or  beneficiary
thereof), or waiver in writing by, Owner Participant of the following additional
conditions precedent:

                  (a)  Appraisal.  Owner  Participant  shall  have  received  an
         appraisal  with  respect to the  Facility  (the  "Appraisal")  from the
         Appraiser.



                                       12

<PAGE>



                  (b)  Tax Opinion.  Owner  Participant  shall have received the
         opinion of its special tax counsel addressed to Owner Participant.

                  (c)  County Letter.  Owner  Participant  shall have received a
         letter from the County of San Bernardino confirming that the Site Lease
         and the  sublease of the Site,  pursuant to the Lease,  are exempt from
         the  requirements  of the  California  Subdivision  Map Act  and  local
         ordinances and codes  regarding  subdivision of real property,  in form
         and substance acceptable to Owner Participant in its sole discretion.

                  Section 4.3  Conditions  Precedent to  Obligations of NACC and
HCNA.  The   obligation  of  NACC  and  HCNA  to  consummate  the   transactions
contemplated by Section 2.1 shall be subject to fulfillment to the  satisfaction
of  (including,  with  respect  to  writings,  such  writings  being in form and
substance reasonably  satisfactory to the addressee or beneficiary  thereof), or
waiver in writing  by,  NACC and HCNA prior to or on the  Closing  Date,  of the
following  conditions  precedent  (except that the  obligations of NACC and HCNA
shall not be subject to such party's own performance or compliance):

                  (a)  Authorization,  Execution and Delivery of Documents.  All
         of the Lease Financing Documents (other than the Account Bank Agreement
         and the Lessor  Security  Agreement)  shall have been duly  authorized,
         executed and delivered by the  respective  parties  thereto (other than
         NACC and  HCNA) and shall be in full  force and  effect on the  Closing
         Date.

                  (b)  Illegality,  etc. No change shall have occurred after the
         date  of  the  execution  and  delivery  of  this  Agreement  in  Legal
         Requirements  other  than a Tax Law  Change  (or  rules or  regulations
         thereunder or interpretations  thereof by any Authority) that would (i)
         make it  illegal  for NACC to  participate  in any of the  transactions
         contemplated by the Operative  Documents or (ii) be reasonably expected
         to have an  adverse  effect on NACC's  or HCNA's  participation  in the
         transaction.

                  (c)  Litigation.  No  action  or  proceeding  shall  have been
         instituted nor shall any Order have been issued by any Authority at the
         time of the Closing Date to set aside, restrain,  enjoin or prevent the
         consummation of the  transactions  contemplated  by this  Participation
         Agreement or by the other Operative Documents.

                  (d)  Officer's  Certificates.  NACC  shall have  received  the
         Officer's  Certificates  described in Sections  4.1(q)(i),  4.1(q)(ii),
         4.1(q)(v) and 4.1(q)(vi).

                  (e)  Resolutions,  Certificates, etc. NACC shall have received
         the Resolutions and Certificates of Owner Participant and Owner Trustee
         described in Section 4.1(r).

                  (f)  Opinions.  NACC  shall  have  received  the  opinions  of
         counsel  described in Sections  4.1(t)  through (z), each  addressed to
         NACC and HCNA.



                                       13

<PAGE>



                  (g)  Babcock  &  Brown,  Inc.  Certificate.  NACC  shall  have
         received the certificate described in Section 4.1(aa).

                  (h)  Owner Participant's  Investment.  Owner Participant shall
         have  contributed  the  amounts  described  in Section  2.1(a) to Owner
         Trustee.

                  (i)  Consents  and  Approvals.   All  consents  and  approvals
         described in Section 4.1(g) shall be  satisfactory  in form,  scope and
         substance to NACC,  have been  executed and delivered and be subject to
         no further appeal. HCNA shall have received the required consent of the
         applicable  banks  under any  agreement  under  which  NACC or HCNA has
         borrowed money in excess of $5,000,000.

                  (j)  No Material  Adverse Change.  Since March 31, 1996, there
         shall have been no material adverse change in the business,  operations
         or financial condition of Owner Participant.

                  (k)  No Event of Loss. No Event of Loss or Regulatory Event of
         Loss or event or condition  which  would,  with the giving of notice or
         the passage of time, constitute an Event of Loss or Regulatory Event of
         Loss shall have occurred.

                  (l)  No  Default.   No  event  shall  have   occurred  and  be
         continuing  that  constitutes a Default or Event of Default or no event
         of default or event or condition which would, with the giving of notice
         or the  passage  of time  constitute  an event of  default,  shall have
         occurred or be continuing  under any agreement under which NACC or HCNA
         has borrowed money in excess of $5.0 million.

                  (m)  Tax Law Change.  As of the Closing  Date,  no  adjustment
         shall be required pursuant to Section  3.2(a)(ii) which,  together with
         any adjustment that is reasonably  expected to be required  pursuant to
         Section  3.2(c) as a result of a Proposed  Tax Law Change,  would cause
         the present value of all  scheduled  payments of Interim Rent and Basic
         Rent  (discounted at the Discount Rate) divided by the Facility Cost to
         increase by more than 100 basis points.

                  (n)  Appraisal.  NACC  shall have  received a letter  from the
         Appraiser  setting forth the Appraiser's  determination  as to the fair
         market value of the Undivided Interest in the Facility and in the Power
         Purchase Agreements,  the fair market rental value (on an annual basis)
         of the  Leasehold  Estate,  the  purchase  price  to be paid if  Lessee
         exercises  its option under  Section 21 of the Lease,  a summary of the
         methodology  employed in the  Appraisal  and a list of the  information
         relied on by the Appraiser in preparing the Appraisal.

                  (o)  HCNA Letter.  Owner  Participant  shall have received the
         HCNA Letter in the form of Exhibit BB.



                                       14

<PAGE>



                                    ARTICLE V

                         REPRESENTATIONS AND WARRANTIES

                  Section  5.1  Representations  and  Warranties  of NACC.  NACC
represents and warrants as of the date of this Participation Agreement and as of
the Closing Date to Owner Participant and Owner Trustee that:

                  (a)  Organization.  NACC  is  a  corporation  duly  organized,
         validly  existing and in good  standing  under the laws of the State of
         Delaware,  and has the  corporate  power and  authority to carry on its
         business in all  material  respects as now  conducted,  to own and hold
         under  lease  its   properties  and  to  enter  into  and  perform  its
         obligations  under each Operative  Document to which it is or will be a
         party and each other letter, certificate,  document or instrument to be
         executed and delivered  therewith or as contemplated  thereby.  NACC is
         duly qualified to do business as a foreign  corporation  and is in good
         standing  in the State of  California  and under the laws of each other
         jurisdiction  where such qualification is required and where failure to
         so qualify  would  reasonably  be expected  to have a Material  Adverse
         Effect.

                  (b)  Authorization, Execution and Delivery; No Conflict.  Each
         Operative  Document  (other than the  Account  Bank  Agreement  and the
         Lessor Security Agreement) and each letter,  certificate,  document and
         instrument to be executed in  connection  therewith to which NACC is or
         will be a party has been duly  authorized  by all  necessary  corporate
         action  on the  part  of,  and has  been or will be duly  executed  and
         delivered  on or prior to the Closing  Date by,  NACC,  and neither the
         execution and delivery  thereof,  nor the  consummation  by NACC of the
         transactions contemplated thereby on the Closing Date nor compliance by
         NACC with any of the terms and  provisions  thereof on the Closing Date
         (A)  contravenes or results in a breach of or  constitutes  any default
         under any provision of the certificate of  incorporation  or by-laws of
         NACC,  (B)  contravenes  or results in a breach of or  constitutes  any
         default  under any  Applicable  Law or any of its  material  properties
         (including  without limitation any building or similar codes or zoning,
         planning or similar  regulations),  or result in the creation of a Lien
         (other than a Permitted Lien of the type described in clause (a) or (b)
         of  the   definition   thereof  and  those  Liens   approved  by  Owner
         Participant)  upon the Facility,  the Site, or the Undivided  Interests
         therein or (C)  contravenes  or results in any breach of or constitutes
         any default under any indenture,  mortgage,  chattel mortgage,  deed of
         trust,  conditional  sales contract,  bank loan or credit  agreement or
         other  material  agreement or instrument to which NACC is a party or by
         which NACC or any of its properties may be bound or affected.

                  (c)  Consents.  Neither the  execution and delivery by NACC of
         the Operative  Documents (other than the Account Bank Agreement and the
         Lessor Security  Agreement) to which NACC is or will be a party nor the
         consummation on the Closing Date of any of the transactions on the part
         of NACC  contemplated  thereby requires the consent or approval of, the
         giving of notice to, or the registration  with, the recording or filing
         of any document  with, or the taking of any other action in respect of,
         any Authority or any


                                       15

<PAGE>



         other  Person,  except (i) those set forth on Schedule  5.1(c) and (ii)
         the recordings and filings described in Schedule 4.1(o).

                  (d)  Enforceability.   Each  Lease   Financing   Document  and
         Facility Document to which NACC is or will be a party  constitutes,  or
         when  entered  into will  constitute,  the  legal,  valid  and  binding
         obligation of NACC,  enforceable  against NACC in  accordance  with the
         terms  thereof  except  as may be  limited  by  applicable  bankruptcy,
         insolvency,  reorganization,  moratorium, or similar laws affecting the
         rights of  creditors  generally  and by  general  principles  of equity
         (regardless of whether considered in a proceeding in equity or at law).

                  (e)  Litigation.  There are no actions,  suits or  proceedings
         before any Authority  pending or, to the knowledge of NACC,  threatened
         against or affecting  NACC,  the Facility,  the Complex,  the Site, the
         Power  Purchase  Agreements or any of its other property or rights that
         (i) question the validity of any Operative  Document or NACC's  ability
         to perform its obligations under each Operative Document to which it is
         or will be a party or (ii),  except as  disclosed  in the SEC  Periodic
         Reports or the Information  Memorandum  would reasonably be expected to
         (individually  or  together  with  any  other  such  actions,  suits or
         proceedings)  have a Material  Adverse  Effect.  NACC is not in default
         with respect to any Order of any  Authority,  where such default  would
         reasonably  be  expected  to have a  Material  Adverse  Effect or would
         result  in the  creation  or  imposition  of  any  Lien  (other  than a
         Permitted Lien) upon the Facility,  the Site or the Undivided Interests
         therein or affect the rights and remedies of the Owner  Participant  or
         Lessor under any of the  Operative  Documents.  No action or proceeding
         has been  instituted,  and no Order has been issued by any Authority to
         set  aside,  restrain,  enjoin  or  prevent  the  consummation  of  the
         transactions contemplated by the Operative Documents.

                  (f)  Title;  Filings.  On the Closing  Date (A) NACC will have
         conveyed to Owner Trustee good,  marketable  (to the extent any portion
         of the Facility  constitutes real estate) and indefeasible title to the
         Undivided Interest in the Facility and NACC will have good,  marketable
         and  indefeasible  title  to the  Site  and  NACC  will  have  good and
         marketable  title to the Easement Site, in each case, free and clear of
         all Liens (other than  Permitted  Liens of the type described in clause
         (a), (b), (f), (h) or (l) of the definition  thereof;  (B) the Facility
         will be  located  on the Site and  pursuant  to the Site  Lease,  Owner
         Trustee  shall  hold  a  valid,  subsisting  and  marketable  leasehold
         interest  in the Site free and  clear of Liens  (other  than  Permitted
         Liens of the type  described in clause (a), (b), (f), (h) or (l) of the
         definition  thereof;  and (C) satisfactory  arrangements will have been
         made to file or record all  documents  described in Schedule  4.1(o) in
         the appropriate offices.

                  (g)  Taxes.  NACC has filed or  caused to be filed all  United
         States  Federal and all other tax returns  required to be filed by NACC
         and has  paid,  or caused  to be paid,  all  taxes  shown to be due and
         payable on such  returns  to the  extent  the same have  become due and
         payable, except for any taxes and assessments of which the amount,


                                       16

<PAGE>



         applicability  or validity is currently being  contested  pursuant to a
         Permitted  Contest  and except to the extent  non-filing  or  incorrect
         filing  could not  reasonably  be expected  to have a Material  Adverse
         Effect.

                  (h)  Financial   Statements.   NACC  has  delivered  to  Owner
         Participant  copies of a balance sheet of NACC as at March 25, 1995 and
         the related  statements of income and  statements of cash flows for the
         fiscal year ended on said date. Said financial  statements are complete
         and correct in all material  respects and present  fairly the financial
         position of NACC as of the date of said balance sheet,  and the results
         of its  operations and its cash flows for the period ended of such date
         and have been prepared in accordance with generally accepted accounting
         principles  consistently applied throughout the periods involved except
         as set forth in the notes thereto.  Since March 25, 1995,  NACC has not
         incurred any material  contingent  liability or liability for taxes, or
         any  long-term  lease  or  unusual  forward  or  long-term  commitment,
         including any Interest Rate or Currency  Protection  Agreements,  other
         than in the ordinary course of business.

                  (i)  Disclosure.  Taken as a whole, neither this Participation
         Agreement,  the SEC Periodic Reports, the Information  Memorandum,  nor
         the other  Operative  Documents to which NACC is or will be a party nor
         the other documents and certificates  furnished by or on behalf of NACC
         pursuant to this Participation  Agreement to Owner Participant contains
         any untrue  statement  of a material  fact or omits to state a material
         fact necessary to make the statements  contained  therein,  in light of
         the circumstances under which they were made, not misleading; except as
         disclosed in the SEC Periodic  Reports or the  Information  Memorandum,
         there is no fact known to NACC which  would  reasonably  be expected to
         have a material adverse effect on the business, operations, property or
         financial  or  other  condition  of  NACC or  HCNA  and its  Restricted
         Subsidiaries taken as a whole.

                  (j)  Description  of Facility and Site. The  descriptions  set
         forth in  Schedules I and II to the Lease,  Schedule I and Exhibit A to
         the Argus Utility Deed of Improvements  and Schedule I and Exhibit A to
         the  Argus  Utility  Bill of Sale are in each  case  true  and  correct
         descriptions  of  the  Facility  and  the  Site,  respectively,  in all
         material respects.

                  (k)  Defaults;  Events of Loss.  Other than HCNA's  failure to
         deliver audited financial statements with respect to HCNA's fiscal year
         ended March 30, 1996 to the holders of its Debt, no Default or Event of
         Default has  occurred and is  continuing.  No Event of Loss or event or
         condition  which  would,  with the  giving of notice or the  passage of
         time, constitute an Event of Loss has occurred.

                  (l)  Investment Company.  NACC is not an "investment  company"
         or a  company  "controlled"  by an  "investment  company,"  within  the
         meaning of the Investment Company Act of 1940, as amended.



                                       17

<PAGE>



                  (m)  Holding  Company.  NACC is not subject to regulation as a
         "holding  company,"  an  "affiliate"  of  a  "holding  company,"  or  a
         "subsidiary  company" of a "holding company," within the meaning of the
         Public Utility Holding Company Act of 1935, as amended.

                  (n)  Chief Executive  Office.  The chief place of business and
         the  chief  executive  office  of NACC  are  located  at  8300  College
         Boulevard,  Overland  Park,  Kansas  66210,  and the offices where NACC
         keeps its records  concerning the Facility (and the Undivided  Interest
         therein)  and the  Operative  Documents  to which  NACC is a party  are
         located at 8300 College  Boulevard,  Overland Park, Kansas 66210 and at
         13200 Main Street, Trona, California 93562.

                  (o)  No  Violation  of   Applicable   Law.  The   transactions
         contemplated by the Operative  Documents to be performed by NACC on the
         Closing Date do not violate any Legal Requirement.

                  (p)  No  Material  Adverse  Change.  (i)  There  has  been  no
         material  adverse  change  in the  business,  operations  or  financial
         condition  of NACC or HCNA  (each on a  consolidated  basis)  from that
         existing on March 25, 1995 and (ii) since  January 30, 1996,  there has
         been no material adverse change with respect to the Facility,  the Site
         or the Complex.

                  (q)  Condition  of  Facility.  Except as set forth in Schedule
         5.1(q), NACC does not know of any event or condition currently existing
         which,  taking  into  account  the age and  maintenance  history of the
         Facility,  (i) presently adversely affects the capacity of the Facility
         to generate reliably steam and electrical power at the levels set forth
         in clause (ii) of this  Section  5.1(q) at the rate of  consumption  of
         coal and gas fuel set forth in  clause  (iii) of this  Section  5.1(q),
         (ii)  causes  NACC to  believe  that the  combined  rated  gross  steam
         generation  capacity  and rated gross  electrical  power  output of the
         Facility  is less than (x) 1.4 million  lbs/hour  of 1,500 psig,  955oF
         steam  and (y) 54 MW of  electrical  power;  or  (iii)  causes  NACC to
         believe that the rate of  consumption of coal and gas fuel necessary to
         provide  simultaneously  the steam  generation  capacity and electrical
         power  output set forth in clause  (ii)  above  exceeds  1,970  million
         Btu/hour (higher heating value).

                  (r)  Statements   to   Insurers.   All   representations   and
         warranties  made  by  NACC  or its  authorized  representatives  to any
         insurer in connection  with any insurance  required to be maintained by
         NACC under any Operative  Document  were true,  correct and complete in
         all material respects when made.

                  (s)  Sufficiency of Support  Arrangements.  The services to be
         performed  for the Owner  Trustee,  the materials to be supplied to the
         Owner Trustee and the rights  granted to the Owner Trustee  pursuant to
         the Services  Agreement,  the Site Lease,  the Easement and the License
         are sufficient to enable the Facility to be located on the Site for the
         entire  Site Lease Term and to enable the Owner  Trustee (or its agents
         or


                                       18

<PAGE>



         assignees)  to obtain  access to and  operate  the  Facility,  upon the
         expiration or earlier  termination  of the Lease Term for the Facility,
         for the balance of the Site Lease Term  (including  without  limitation
         the period following the Lease Term for the Facility upon the exercises
         of remedies under the Lease) in a manner  consistent  with Section 7 of
         the Lease, substantially continuously and at the capacity or capacities
         at which it is  contemplated on the Closing Date that the Facility will
         be operated from time to time, and there are no services,  materials or
         rights required for such operation other than those granted by or to be
         provided  or  arranged  pursuant to the  Services  Agreement,  the Site
         Lease, the Easement or the License.  NACC has no reason to believe that
         there will be contractual  or, based upon  Applicable  Law, other legal
         rights  required  for  such  occupancy,   use,   possession,   leasing,
         ownership,  operation  and  maintenance  or that  there  will be  other
         services or materials  required for such operation,  maintenance,  use,
         occupancy  and  possession  other than those  which can  reasonably  be
         expected to be available at the end of the Lease Term.

                  (t)  Payment of Taxes,  etc. All taxes, fees and other charges
         due and payable on or prior to the Closing Date in connection  with the
         execution,  delivery,  recordation  and  filing  of all  documents  and
         instruments  contemplated  by the  Operative  Documents,  including the
         Operative  Documents,  and the performance by NACC of the  transactions
         contemplated  by the  Operative  Documents  happening  on or before the
         Closing Date, have been paid in full or arrangements  acceptable to the
         Owner Participant have been made for such payment.

                  (u)  Environmental  Matters.  Except as set forth on  Schedule
         5.1(u), to NACC's best knowledge after due inquiry:

                           (i) NACC is in compliance, except to an insignificant
                  extent,  with all Environmental  Laws with respect to the Site
                  and the Facility. Since March 29, 1992, NACC has complied with
                  all  Environmental  Laws  with  respect  to the  Site  and the
                  Facility,  except  to the  extent  any  Special  Environmental
                  Expenses  resulting  from any  violation of or  non-compliance
                  with such  Environmental Laws did not equal or exceed $100,000
                  as to any individual violation or non-compliance,  or $500,000
                  as to aggregate  violations and  non-compliances.  Since March
                  29, 1992, NACC has complied with all  Environmental  Laws with
                  respect  to the  Complex,  except to the  extent  any  Special
                  Environmental  Expenses  resulting  from any  violation  of or
                  non-compliance  with such  Environmental Laws did not equal or
                  exceed   $500,000   as  to   any   individual   violation   or
                  non-compliance.

                           (ii) NACC  possesses  all  Approvals  required  under
                  Environmental  Laws for the use,  operation and maintenance of
                  the Site and the  Facility  in the  regular  course  of NACC's
                  business as  contemplated  by the Operative  Documents and, to
                  the extent applicable to such use, operation or maintenance of
                  the Site or the Facility,  the Complex,  such Approvals are in
                  full force and effect, and NACC is


                                       19

<PAGE>



                  in compliance,  except to an  insignificant  extent,  with the
                  terms and conditions thereof.

                           (iii)  There is no event that has  occurred or failed
                  to  occur   that  is   reasonably   expected   to  prevent  or
                  significantly  interfere with NACC's  ability to use,  operate
                  and maintain  the Site and the Facility in the regular  course
                  of NACC's business as contemplated by the Operative  Documents
                  in compliance with Environmental  Laws. There is no event that
                  has occurred or failed to occur that is reasonably expected to
                  prevent or significantly interfere with NACC's ability to use,
                  operate and  maintain  the  Complex in the  regular  course of
                  NACC's business as contemplated by the Operative  Documents in
                  compliance with Environmental Laws.

                           (iv) There are no pending or threatened Environmental
                  Claims involving the Site or the Facility. In addition,  since
                  March  29,  1992,  there  have  been no  Environmental  Claims
                  involving the Site or the  Facility,  except to the extent any
                  Special   Environmental   Expenses  resulting  from  any  such
                  Environmental Claim did not equal or exceed $100,000 as to any
                  individual  Environmental  Claim,  or $500,000 as to aggregate
                  Environmental Claims. Since March 29, 1992, there have been no
                  Environmental  Claims  involving  the  Complex,  except to the
                  extent any Special  Environmental  Expenses resulting from any
                  such  Environmental  Claim did not equal or exceed $500,000 as
                  to any individual Environmental Claim.

                           (v) Hazardous  Materials are not present,  generated,
                  used,  treated or stored on, or  transported  to or from,  the
                  Site or the Facility and NACC is not using and does not intend
                  to use or allow  others to use any  portion of the Site or the
                  Facility for such purposes  other than (A) as  appropriate  to
                  operate the Site,  the Facility and the Complex in the regular
                  course of NACC's  business as  contemplated  by the  Operative
                  Documents and (B) in compliance with all  Environmental  Laws.
                  Except  to  the  extent  any  Special  Environmental  Expenses
                  resulting  from the following  conditions or activities  would
                  not  reasonably be expected to equal or exceed  $750,000 as to
                  any such individual condition or activity, Hazardous Materials
                  are not and,  since  March 29,  1992,  have not been  present,
                  generated,  used,  treated or stored on, or  transported to or
                  from, the Complex and, since March 29, 1992, NACC has not used
                  and does not intend to use or allow  others to use any portion
                  of the Complex for such purposes other than in compliance with
                  all Environmental Laws.

                           (vi) There are no actions, activities, circumstances,
                  conditions,  events or incidents at or otherwise involving the
                  Site or the Facility that would reasonably be expected to form
                  the basis of an  Environmental  Claim (A) against or involving
                  the Site,  the  Facility  or NACC,  except to the  extent  any
                  Special   Environmental   Expenses  resulting  from  any  such
                  individual action, activity, circumstance, condition, event or
                  incident would not reasonably be expected to


                                       20

<PAGE>



                  equal  or  exceed  $100,000,  (B)  that  would  reasonably  be
                  expected  to cause the Site or the  Facility  to be subject to
                  any restrictions that prevent or significantly  interfere with
                  its ownership,  occupancy,  use or  transferability  under any
                  Environmental  Law for the use  contemplated  by the Operative
                  Documents, or (C) that would reasonably be expected to prevent
                  or  significantly  interfere with the continued  operation and
                  maintenance of the Site and the Facility in the regular course
                  of NACC's business as contemplated by the Operative Documents.
                  There are no present or, since March 29, 1992,  past  actions,
                  activities, circumstances,  conditions, events or incidents at
                  or otherwise  involving  the Complex that would  reasonably be
                  expected to form the basis of an  Environmental  Claim against
                  or  involving  the  Complex or NACC,  except to the extent any
                  Special   Environmental   Expenses  resulting  from  any  such
                  individual action, activity, circumstance, condition, event or
                  incident  would not  reasonably be expected to reach or exceed
                  $750,000.

                           (vii) There are not now and,  since  March 29,  1992,
                  there  have  not  been  at  the  Site  or  the   Facility  (A)
                  underground  storage  tanks,  (B)  polychlorinated   biphenyls
                  ("PCBs")  regulated  pursuant to the Toxic Substances  Control
                  Act, or (C) friable asbestos.

                           (viii)   There   are   no   pending   or   threatened
                  Environmental Claims involving NACC or HCNA in connection with
                  any offsite  treatment,  storage or disposal facility that has
                  received  Hazardous  Materials  from or generated at the Site,
                  the Facility or the Complex.

                  (v)  Status of Site. On the Closing Date (A) the Facility will
         be located on the Site and will not  encroach on any  property  located
         outside the Site and the Easement Site; (B) any structure,  improvement
         or part thereof which is part of the Facility which encroaches upon any
         easement  or right of way  within the Site does not or shall not have a
         material  adverse  effect  on the  ability  of  Owner  Trustee  (or its
         designee) to operate the Facility on a commercially reasonable basis in
         accordance  with  Applicable  Law or the value,  utility  or  remaining
         useful  life of the  Facility  or the Site  except to an  insignificant
         extent; (C) any structure, improvement or part thereof that is not part
         of the Facility  which is located on or  encroaches  upon the Site does
         not and shall not have a  material  adverse  effect on the  ability  of
         Owner   Trustee  (or  its  designee)  to  operate  the  Facility  on  a
         commercially  reasonable  basis in accordance with Applicable Law or on
         the value,  utility or  remaining  useful  life of the  Facility or the
         Site, except to an insignificant  extent;  (D) no easements,  rights of
         way or other  encumbrance  exist  with  respect  to the Site other than
         Permitted Liens of the type described in clauses (a), (b), (f), (h) and
         (l) and none of such Liens has or would  reasonably be expected to have
         a material  adverse  effect on the ability of Owner  Trustee to operate
         the Facility on a  commercially  reasonable  basis in  accordance  with
         Applicable  Law or the value,  utility or remaining  useful life of the
         Facility  or the Site  except to an  insignificant  extent,  and (E) no
         rights other than those conveyed to Owner Trustee pursuant to the Argus
         Utility  Bill of Sale,  Argus  Utility Deed of  Improvements,  the Site
         Lease, the Easement, the License and the


                                                        21

<PAGE>



         Services  Agreement  are required for the Owner  Trustee to operate the
         Facility  on  a  commercially   reasonable  basis  in  accordance  with
         Applicable Law.

                  (w)  Qualifying   Facility.   The  Facility  is  a  Qualifying
         Facility.  FERC has issued a final order granting  Kerr-McGee  Chemical
         Corporation's  application for  certification as a Qualifying  Facility
         and NACC has filed with FERC a notice of self- certification reflecting
         its   ownership  of  the  Facility  and   satisfaction   of  the  other
         requirements  for Qualifying  Facility status pursuant to 18 C.F.R. ss.
         292.207(a).

                  (x)  ERISA.  (i) None of the  Pension  Plans or their  related
         trusts  have been  terminated  in a distress  termination  pursuant  to
         Section  4041(c) of ERISA or by the PBGC  pursuant  to Section  4042 of
         ERISA, nor have any actions been taken to so terminate any Pension Plan
         or related  trust and neither  NACC,  HCNA nor any ERISA  Affiliate has
         incurred or could  reasonably be expected to incur any  liability  with
         respect to a Pension Plan under  Section  4062,  4063,  4064 or 4069 of
         ERISA which liability has had or could reasonably be expected to have a
         Material Adverse Effect.

                           (ii) There have been no "reportable  events" (as such
         term is  defined  in  Section  4043(c)  of ERISA)  for which the notice
         requirement to the PBGC has not been waived with respect to any Pension
         Plan which have had or could  reasonably be expected to have a Material
         Adverse Effect.

                           (iii) No  "accumulated  funding  deficiency" (as such
         term is defined in  Section  302 of ERISA or Section  412 of the Code),
         whether or not waived,  exists or is expected to exist with  respect to
         any Pension Plan, nor has any request for a waiver under Section 412(d)
         of the Code been, or is reasonably  likely to be, filed with respect to
         any of the Pension Plans.

                           (iv) Neither NACC,  HCNA nor any ERISA  Affiliate has
         failed to make any  contribution  or payment to any Pension  Plan which
         has  resulted  or  could  reasonably  be  expected  to  result  in  the
         imposition of a Lien under Section 302(f) of ERISA or Section 412(n) of
         the Code.

                           (v) There is no violation of any applicable provision
         of ERISA or the Code with  respect to any Pension  Plan that has had or
         could reasonably be expected to have a Material Adverse Effect.

                           (vi) Neither NACC,  HCNA nor any ERISA  Affiliate has
         incurred or is  reasonably  likely to incur any  liability  pursuant to
         Section 515, 4201 or 4204 of ERISA that has had or could  reasonably be
         expected to have a Material Adverse Effect.

                           (vii) No  Pension  Plan is a  multiemployer  plan (as
         defined in Section 4001(a)(3) of ERISA).



                                       22

<PAGE>



                           (viii) Neither NACC, HCNA nor any ERISA Affiliate has
         breached  the  fiduciary  rules of ERISA or  engaged  in a  "prohibited
         transaction" (within the meaning of Section 4975 of the Code or Section
         406 of ERISA) which breach or prohibited  transaction  could reasonably
         be expected to subject NACC or HCNA to any direct or indirect liability
         (including,  without  limitation,  as a result  of any  indemnification
         obligation)  in  connection  with a suit for  damages  or  pursuant  to
         Section 409 or 502 of ERISA or Section 4975 of the Code which liability
         has had or could  reasonably  be  expected  to have a Material  Adverse
         Effect.

                           (ix)  Assuming  the  accuracy of the  representations
         made by  Owner  Participant  in  Section  5.3(j)  of the  Participation
         Agreement  and the Other  Owner  Participant  in Section  5.3(j) of the
         Other  Participation  Agreement,  the execution and delivery by NACC of
         this Agreement and the other Operative Documents,  and the consummation
         of the transactions  contemplated hereby and thereby,  will not involve
         any prohibited  transaction within the meaning of Section 4.06 of ERISA
         or Section 4975 of the Code.

                  (y)  Securities  Laws.  The use of the  funds  from the  Owner
         Participant  under this  Participation  Agreement  will not  violate or
         result in any violation of Section 7 of the Securities  Exchange Act of
         1934,  as  amended,   or  any  regulations   issued  pursuant  thereto,
         including,  without limitation,  Regulations G, T, U and X of the Board
         of Governors of the Federal Reserve System.

                  (z)  Utility  Services.  The Site,  together with the Easement
         Site have,  or on the Closing Date will have,  available  all utilities
         necessary  for use,  maintenance  and operation of the Facility for its
         intended purposes including,  without limitation,  electricity,  water,
         gas, sewer, parking and telephone.

                  (aa) Restrictions; Covenants. Schedule 5.1(aa) contains a list
         of all  restrictions  or  covenants  running  with the Site that  would
         reasonably be expected to have a Material Adverse Effect. To the actual
         knowledge of NACC and HCNA, no default or breach, or event, occurrence,
         condition or act which, with the giving of notice, the lapse of time or
         both may give rise to any default or breach, exists under any covenant,
         condition,  restriction,  right-of-way,  easement  or  other  agreement
         affecting  all  or  any  portion  of  the  Site   (including,   without
         limitation,  deed  restrictions,  site plan approvals or  redevelopment
         plans,  whether or not appearing in the public  records) which is to be
         performed  or complied  with by the owner or occupant of the Site,  the
         nonperformance  of which would  reasonably be expected to have Material
         Adverse Effect.

                  (bb) No Pending  Assessments.  To the actual knowledge of NACC
         and HCNA,  there are no public  improvements  pending or intended  that
         would result in any charge or special  assessment  being levied against
         the Facility,  the Site and the Easement  Site,  except as reflected in
         the title  commitment  delivered  pursuant  to Section  4.1(h)  hereof.
         Except as  disclosed  in Schedule  5.1(bb),  neither the  execution  or
         delivery of any  Operative  Documents on the Closing Date by NACC,  nor
         the recordation of any thereof


                                       23

<PAGE>



         (or the filing or recordation  of any memoranda or financing  statement
         with respect  thereto) nor the  consummation by NACC on or prior to the
         Closing Date of any of the transactions  contemplated hereby or thereby
         will of itself result in any tax,  levy,  impose,  duty,  charge (other
         than routine filing fees) or  withholding  imposed by the United States
         of  America  or the State of  California  or any  taxing  authority  or
         political subdivision thereof on or with respect to any such execution,
         delivery,  recordation,  filing or consummation or upon or with respect
         to Owner Participant,  Owner Trustee,  the Site or Trust Estate,  other
         than secured and/or  unsecured  property taxes based on reassessment of
         the Facility resulting from the conveyance of the Undivided Interest to
         the Owner Trustee.

                  (cc) Foreign Control Regulations. So long as none of the Owner
         Trustee,  the Owner  Participant,  the Other Owner  Trustee,  the Owner
         Participant  under  the  Other  Participation   Agreement  or  the  "OP
         Guarantor" under the Other Participation Agreement is a national of any
         foreign  country  or area which is the  subject  of any of the  foreign
         asset  control  regulations,  assets  control  regulations,   sanctions
         regulations and transactions  regulations of the United States Treasury
         Department  set forth in 31 C.F.R.,  Subtitle B,  Chapter V, as amended
         (collectively,  the "FAC  Regulations"),  or is  controlled by or has a
         substantial  part of its securities or obligations  owned or controlled
         by any of such  countries or areas or any national  thereof  within the
         meaning of such Regulations, Owner Trustee's use of the proceeds of the
         transaction  contemplated  hereby in accordance with Section 2.1 on the
         Closing  Date will not  violate  the  Trading  with the Enemy Act,  any
         Executive Order issued thereunder or the FAC Regulations.

                  (dd) Status of Site and Easement  Site. To the best  knowledge
         of NACC after due inquiry and except to the extent that such  condition
         would  not  reasonably  be  expected  either  individually  or  in  the
         aggregate  to have a  Material  Adverse  Effect,  (i) the  Site and the
         Easement  Site  are  not,  and  never  have  been,  dedicated  cemetery
         property;  (ii) the Site and the Easement  Site are not  classified  as
         regulated  "wetlands"  and do not  require  a Federal  Water  Pollution
         Control Act Section 404 permit for development or  construction;  (iii)
         the Site and the Easement Site are not located in an area designated by
         the  Secretary of the Interior as a critical  habitat of  endangered or
         threatened  species  covered by the Endangered  Species Act of 1973, 16
         U.S.C.A.  ss.1531-1544,  and do not  require  any  Approvals  under the
         Endangered Species Act or any other Applicable Law governing endangered
         or threatened species; (iv) there are no antiquities on the Site or the
         Easement Site which would qualify for  protection  under any Applicable
         Law including,  but not limited to, Indian burial mounds,  battle field
         sites or old graveyards; and (v) the Site and the Easement Site are not
         subject to the California Desert Protection Act.

                  (ee) Power Purchase Agreements. (i) Each of the Power Purchase
         Agreements  is a legally valid and  enforceable  agreement as to itself
         and  the  Power  Purchaser,  except  as may be  limited  by  applicable
         bankruptcy,  insolvency,  reorganization,  moratorium,  or similar laws
         affecting the rights of creditors  generally and by general  principles
         of equity  (regardless of whether  considered in a proceeding in equity
         or at law), (ii) each of the


                                       24

<PAGE>



         Power Purchase  Agreements is in full force and effect and has not been
         modified or amended in any respect  except for  Amendment  No. 1 to the
         Parallel Generation  Agreement between Kerr-McGee Chemical  Corporation
         and Southern California Edison, dated March 27, 1989, and Amendment No.
         2, (iii) other than the  "Assignment  and  Assumption  of the  Parallel
         Generation  Agreements  between Southern  California Edison Company and
         Kerr-McGee Chemical Corporation," dated as of November 30, 1990, by and
         between  Kerr-McGee  Chemical  Corporation and NACC,  there has been no
         prior  assignment  of the Power  Purchase  Agreements of which NACC has
         notice or is aware,  (iv) neither  NACC nor, to NACC's best  knowledge,
         without  investigation,  the Power  Purchaser  is in default  under the
         Power Purchase  Agreements,  and (v) to NACC's best knowledge,  without
         investigation,  all  covenants,  conditions  and  agreements  have been
         performed as required in the Power Purchase Agreements except those not
         due to be performed until after the date hereof and there is no default
         or any condition  which,  with the passage of time and/or the giving of
         notice,  or both,  would  constitute a default under the Power Purchase
         Agreements,  and  there  are no claims or rights of setoff by any party
         thereto against the other.

                  (ff) BLM Leases. NACC is the sole tenant under each of the BLM
         Leases.  Except to the extent the same would not reasonably be expected
         to have a  Material  Adverse  Effect,  (i) each of the BLM Leases is in
         full force and effect;  (ii) neither  NACC nor the BLM  currently is in
         default under any of the BLM Leases and no condition exists which, with
         the giving of notice or the passage of time (or both), would constitute
         a default or event of default  under any of the BLM Leases;  (iii) NACC
         has received no notice from the BLM of an intention to terminate any of
         the  BLM  Leases  and  has  no  reason  to  believe  that  the  BLM  is
         contemplating the termination of any of the BLM Leases.

                  Section  5.2  Representations  and  Warranties  of HCNA.  HCNA
represents and warrants as of the date of this Participation Agreement and as of
the Closing Date to Owner Participant and Owner Trustee that:

                  (a)  Organization.  HCNA  is  a  corporation  duly  organized,
         validly  existing and in good  standing  under the laws of the State of
         Delaware,  and has the  corporate  power and  authority to carry on its
         business in all  material  respects as now  conducted,  to own and hold
         under  lease  its   properties  and  to  enter  into  and  perform  its
         obligations  under each Operative  Document to which it is or will be a
         party and each other letter, certificate,  document or instrument to be
         executed and delivered  therewith or as contemplated  thereby.  HCNA is
         duly qualified to do business as a foreign  corporation  under the laws
         of each  jurisdiction  where  the  ownership,  lease  or  operation  of
         property of the conduct or business  requires  such  qualification  and
         where  failure to so qualify  would  reasonably  be  expected to have a
         Material Adverse Effect.

                  (b)  Authorization,  Execution and Delivery; No Conflict. Each
         Operative Document to which HCNA is or will be a party and each letter,
         certificate,  document or other  instrument  executed and  delivered in
         connection therewith has been duly authorized


                                       25

<PAGE>



         by all necessary  corporate action on the part of, and has been or will
         be duly  executed  and  delivered  on or prior to the Closing  Date by,
         HCNA,  and  neither  the  execution  and  delivery  thereof,   nor  the
         consummation  by  HCNA of the  transactions  contemplated  thereby  nor
         compliance  by HCNA with any of the terms and  provisions  thereof  (A)
         contravenes or results in a breach of or constitutes  any default under
         any provision of the certificate of  incorporation  or by-laws of HCNA,
         (B)  contravenes or results in a breach of or  constitutes  any default
         under any existing  law,  judgment,  governmental  rule,  regulation or
         order  applicable  to or  binding  on  HCNA  or  any  of  its  material
         properties  (including without limitation any building or similar codes
         or zoning, planning or similar regulations),  or result in the creation
         of a Lien  (other  than a  Permitted  Lien or Liens  approved  by Owner
         Participant)  upon the  Facility,  the Site or the  Undivided  Interest
         therein or (C)  contravenes  or results in any breach of or constitutes
         any default under any indenture,  mortgage,  chattel mortgage,  deed of
         trust,  conditional  sales contract,  bank loan or credit  agreement or
         other  material  agreement or instrument to which HCNA is a party or by
         which HCNA or any of its properties may be bound or affected.

                  (c)  Consents.  Neither the  execution and delivery by HCNA of
         the  Operative  Documents  to which  HCNA is or will be a party nor the
         consummation on the Closing Date of any of the transactions on the part
         of HCNA  contemplated  thereby requires the consent or approval of, the
         giving of notice to, or the registration  with, the recording or filing
         of any document  with, or the taking of any other action in respect of,
         any  Authority  or any  other  Person,  except  (i)  those set forth on
         Schedule  5.1(c)  and (ii) the  recordings  and  filings  described  in
         Schedule 4.1(o).

                  (d)  Enforceability.  Each Operative Document to which HCNA is
         or will be a party  constitutes,  or when entered into will constitute,
         the legal,  valid and binding obligation of HCNA,  enforceable  against
         HCNA in accordance  with the terms thereof  except as may be limited by
         applicable  bankruptcy,  insolvency,  reorganization,   moratorium,  or
         similar laws affecting the rights of creditors generally and by general
         principles of equity  (regardless of whether considered in a proceeding
         in equity or at law).

                  (e)  Litigation.  There are no actions,  suits or  proceedings
         before any Authority  pending or, to the knowledge of HCNA,  threatened
         against or  affecting  HCNA or any of its  property  or rights that (i)
         question the validity of any  Operative  Document or HCNA's  ability to
         perform its obligations under each Operative Document to which it is or
         will be a  party,  or (ii)  except  as  disclosed  in the SEC  Periodic
         Reports or the Information Memorandum,  would reasonably be expected to
         have a (individually or together with any other such actions,  suits or
         proceedings)  Material  Adverse  Effect.  HCNA is not in  default  with
         respect  to any  Order  of any  Authority,  where  such  default  would
         reasonably  be  expected  to have a  Material  Adverse  Effect or would
         result  in the  creation  or  imposition  of  any  Lien  (other  than a
         Permitted Lien) upon the Facility,  the Site or the Undivided  Interest
         therein.



                                       26

<PAGE>



                  (f)  Taxes.  HCNA has filed or  caused to be filed all  United
         States  Federal and all  material  tax returns  required to be filed by
         HCNA and has paid, or caused to be paid,  all taxes shown to be due and
         payable on such  returns  to the  extent  the same have  become due and
         payable,  except  for any taxes and  assessments  of which the  amount,
         applicability  or validity is currently being  contested  pursuant to a
         Permitted  Contest  and except to the extent  non-filing  or  incorrect
         filing  could not  reasonably  be expected  to have a Material  Adverse
         Effect.

                  (g)  Financial   Statements.   HCNA  has  delivered  to  Owner
         Participant copies of an audited  consolidated balance sheet of HCNA as
         at March 25, 1995 and the related consolidated statements of income and
         statements  of cash flows for the fiscal year ended on said date.  Said
         financial  statements are complete and correct in all material respects
         and present fairly the consolidated  financial position of HCNA and its
         Subsidiaries as of the date of said balance sheet, and the consolidated
         results of their  operations and cash flows for the fiscal period ended
         on such  date and have  been  prepared  in  accordance  with  generally
         accepted  accounting  principles  consistently  applied  throughout the
         periods involved except as set forth in the notes thereto.  Since March
         25, 1995, none of HCNA and its Subsidiaries  have incurred any material
         contingent  liability or liability for taxes, or any long-term lease or
         unusual forward or long-term commitment, including any Interest Rate or
         Currency  Protection  Agreements,  other than in the ordinary course of
         business.

                  (h)  Disclosure.  Taken as a whole, neither this Participation
         Agreement,  the SEC Periodic Reports, the Information  Memorandum,  nor
         the other  Operative  Documents  to which HCNA is or will be a party or
         the other documents and certificates  furnished by or on behalf of HCNA
         or NACC pursuant to this  Participation  Agreement to Owner Participant
         contains any untrue  statement  of a material  fact or omits to state a
         material fact necessary to make the statements  contained  therein,  in
         light of the circumstances  under which they were made, not misleading;
         except as  disclosed  in the SEC  Periodic  Reports or the  Information
         Memorandum,  there is no fact known to HCNA which would  reasonably  be
         expected to have a material adverse effect on the business, operations,
         property  or  financial  or  other  condition  of NACC or HCNA  and its
         Restricted Subsidiaries taken as a whole.

                  (i)  Investment Company.  HCNA is not an "investment  company"
         or a  company  "controlled"  by an  "investment  company",  within  the
         meaning of the Investment Company Act of 1940, as amended.

                  (j)  Holding  Company.  HCNA is not subject to regulation as a
         "holding  company,"  an  "affiliate"  of  a  "holding  company,"  or  a
         "subsidiary  company" of a "holding company," within the meaning of the
         Public Utility Holding Company Act of 1935, as amended.

                  (k)  Chief Executive  Office.  The chief place of business and
         the chief executive office of HCNA are located at 399 Park Avenue, 32nd
         Floor, New York, New


                                       27

<PAGE>



         York 10022, and the offices where HCNA keeps its records concerning the
         Facility  and the  Operative  Documents  to which  HCNA is a party  are
         located at 8300 College  Boulevard,  Overland Park, Kansas 66210 and at
         13200 Main Street, Trona, California 93562.

                  (l)  NACC Representations.  The representations and warranties
         of NACC contained in this Participation  Agreement are true and correct
         in all material respects on the date made.

                  (m)  NACC  Ownership.  NACC is a  wholly-owned  subsidiary  of
         HCNA.

                  Section   5.3   Representations   and   Warranties   of  Owner
Participant.  Owner Participant represents and warrants at and as of the date of
this Participation  Agreement and as of the Closing Date to NACC, HCNA and Owner
Trustee that:

                  (a)  Organization.  Owner  Participant  is a corporation  duly
         organized,  validly existing and in good standing under the laws of the
         jurisdiction  of its  organization,  and  had  and  has  the  necessary
         corporate  power and authority to carry on its business in all material
         respects as now  conducted,  to own and hold under lease its properties
         and to enter into and  perform  its  obligations  under each  Operative
         Document  to which  it is or will be a party  and  each  other  letter,
         certificate,  document  or  instrument  to be  executed  and  delivered
         therewith  or  as  contemplated  thereby.  Owner  Participant  is  duly
         qualified  to do  business  as a  foreign  corporation  and is in  good
         standing in each jurisdiction  where such qualification is required and
         where the failure to do so would have a material  adverse effect on its
         business,  operations  or  properties  or its  ability to  perform  its
         obligations under the Operative Documents or the rights and remedies of
         HCNA, NACC or Owner Trustee under any of the Operative Documents.

                  (b)  Authorization, Execution and Delivery; No Conflicts. Each
         Operative   Document  and  each  letter,   certificate,   document  and
         instrument  to be  executed  in  connection  therewith  to which  Owner
         Participant  is or will be a party  has  been  duly  authorized  by all
         necessary corporate action on the part of, and has been or will be duly
         executed  and  delivered  on or prior  to the  Closing  Date by,  Owner
         Participant,  and neither the execution and delivery  thereof,  nor the
         consummation  by Owner  Participant  of the  transactions  contemplated
         thereby,  nor compliance by Owner Participant with any of the terms and
         provisions  thereof  (A)  contravenes  or  results  in a  breach  of or
         constitutes  any default  under any  provision  of the  certificate  of
         incorporation, by-laws or other organizational or governing document of
         Owner  Participant,  (B)  contravenes  or  results  in a  breach  of or
         constitutes any default under any existing law, judgment,  governmental
         rule, regulation or order applicable to or binding on Owner Participant
         or any of its material  properties  (including  without  limitation any
         building or similar codes or zoning,  planning or similar  regulations)
         or (C)  contravenes  or  results in any  breach of or  constitutes  any
         default under any indenture, mortgage, chattel mortgage, deed of trust,
         conditional  sales  contract,  bank loan or credit  agreement  or other
         material


                                       28

<PAGE>



         agreement or  instrument  to which Owner  Participant  is a party or by
         which  Owner  Participant  or any of its  properties  may be  bound  or
         affected.

                  (c)  Consents.  Neither the  execution  and  delivery by Owner
         Participant of the Operative Documents to which Owner Participant is or
         will be a party nor the  consummation on the Closing Date of any of the
         transactions  on the part of  Owner  Participant  contemplated  thereby
         requires  the consent or  approval  of, the giving of notice to, or the
         registration with, the recording or filing of any document with, or the
         taking of any other  action in respect of, any  Authority  or any other
         Person  other than those which have  already  been  obtained,  given or
         made.

                  (d)  Enforceability.  Each  Operative  Document to which Owner
         Participant  is or will be a party  constitutes,  or when  entered into
         will  constitute,  the legal,  valid and  binding  obligation  of Owner
         Participant,  enforceable  against Owner Participant in accordance with
         the terms thereof  except as may be limited by  applicable  bankruptcy,
         insolvency,  reorganization,  moratorium, or similar laws affecting the
         rights of  creditors  generally  and by  general  principles  of equity
         (regardless of whether considered in a proceeding in equity or at law).

                  (e)  Litigation.  There are no actions,  suits or  proceedings
         before any Authority pending or, to the knowledge of Owner Participant,
         threatened  against  or  affecting  Owner  Participant  or  any  of its
         property  or rights that (i)  question  the  validity of any  Operative
         Document  or Owner  Participant's  ability to perform  its  obligations
         under each  Operative  Document  to which it is or will be a party,  or
         (ii) would  reasonably  be expected to  (individually  or together with
         any.other such actions, suits or proceedings)  materially and adversely
         affect the business,  operations or properties of Owner  Participant or
         its  ability  to perform  its  obligations  under any of the  Operative
         Documents to which it is or will be a party.  Owner  Participant is not
         in  default  with  respect  to any Order of any  Authority,  where such
         default  would  materially  and  adversely  affect the ability of Owner
         Participant  to  perform  its  obligations  under any of the  Operative
         Documents  to which it is or will be a party,  or would  result  in the
         creation or imposition  of any Lien upon the Facility,  the Site or the
         Undivided Interests therein.

                  (f)  Investment   Company.   Owner   Participant   is  not  an
         "investment  company"  or a  company  "controlled"  by  an  "investment
         company",  within the meaning of the Investment Company Act of 1940, as
         amended.

                  (g)  Holding   Company.   Without   giving   effect   to   the
         transactions  contemplated hereby or by the other Operative  Documents,
         Owner Participant is not subject to regulation as a "holding  company,"
         an "affiliate" of a "holding  company," or a "subsidiary  company" of a
         "holding  company,"  within the meaning of the Public  Utility  Holding
         Company Act of 1935, as amended.

                  (h)  No Liens.  The Trust  Estate is free of any Lessor  Liens
         attributable to Owner Participant.


                                       29

<PAGE>




                  (i)  Ordinary  Course  of  Business.   Owner   Participant  is
         entering  into  this  Participation   Agreement  and  the  transactions
         contemplated hereby in its ordinary course of business.

                  (j)  ERISA.  With respect to the amount to be  contributed  to
         Owner Trustee by Owner Participant  pursuant to Section 2.1, no part of
         such amount constitutes assets of an "employee benefit plan" within the
         meaning of Section  3(3) of ERISA which is subject to Title I of ERISA,
         a "plan"  within the  meaning of Section  4975 of the Code or an entity
         that is deemed to hold "plan  assets"  within the  meaning of 29 C.F.R.
         ss. 2510.3- 101 of any such employee benefit plan or plan.

                  Section 5.4 [Reserved.]

                  Section 5.5  Representations  and  Warranties of Trust Company
and Owner Trustee.  Trust Company  represents and warrants to Owner Participant,
NACC and HCNA, as to matters set forth in Sections 5.5(a), (c) (to the extent it
relates to the Trust  Company),  (d)(i),  (e) (to the extent it relates to Trust
Company)  and  (f),  and  Owner  Trustee   represents   and  warrants  to  Owner
Participant,  NACC and HCNA, as to matters set forth in Sections 5.5(b), (c) (to
the extent it relates to Owner Trustee),  (d)(ii), (e) (to the extent it relates
to Owner Trustee) and (f) that:

                  (a)  Organization.   Trust  Company  is  a  national   banking
         association,  duly  organized,  validly  existing and in good  standing
         under the laws of the United  States of America,  and has the corporate
         power and authority to enter into and perform its obligations under the
         Trust Agreement.

                  (b)  Authorization;  Execution  and Delivery.  Each  Operative
         Document  to which  Owner  Trustee  is or will be a party has been duly
         authorized  by all necessary  corporate  action on the part of, and has
         been or will be duly  executed and delivered on or prior to the Closing
         Date by, Owner Trustee.

                  (c)  No Conflict.  Neither the execution and delivery by Trust
         Company of the  Operative  Documents to which it is or will be a party,
         either in its  individual  capacity,  as Owner Trustee or both, nor the
         consummation of the transactions  contemplated  thereby, nor compliance
         by Trust Company or Owner Trustee,  as the case may be, with any of the
         terms and provisions  thereof (A) contravenes or results in a breach of
         or  constitutes  any default  under any  provision  of the  articles of
         association or by-laws or other organizational or governing document of
         Trust Company, (B) contravenes or results in a breach of or constitutes
         any default under any existing  California or New York law, judgment or
         order  specifically  applicable to or binding on Trust Company,  in its
         individual  capacity or as Owner Trustee, as the case may be, or any of
         its properties,  (C) contravenes any United States Federal,  California
         or New York law  relating  to the  banking  or  trust  powers  of Trust
         Company or Owner Trustee, as the case may be, or contravenes or results
         in a breach of any  governmental  rule,  regulation  or order under any
         such law, or (D) contravenes or results in any breach of or constitutes
         any default


                                       30

<PAGE>



         under  any  indenture,  mortgage,  chattel  mortgage,  deed  of  trust,
         conditional  sales  contract,  bank loan or credit  agreement  or other
         material  agreement  or  instrument  to  which  Trust  Company,  in its
         individual capacity or as Owner Trustee, as the case may be, is a party
         or by which  Trust  Company,  in its  individual  capacity  or as Owner
         Trustee,  as the case may be, or any of its  properties may be bound or
         affected.

                  (d)  Enforceability.  (i) The  Trust  Agreement  has been duly
         authorized,  executed and delivered by Trust Company;  assuming the due
         authorization,  execution and delivery by the other parties,  the Trust
         Agreement  and this Section 5.5 (to the extent made by Trust Company in
         its   individual   capacity)  and  Sections  5.6  and  6.4(e)  of  this
         Participation Agreement are the legal, valid and binding obligations of
         Trust Company, enforceable against Trust Company in accordance with the
         terms  thereof  except  as may be  limited  by  applicable  bankruptcy,
         insolvency,  reorganization,  moratorium, or similar laws affecting the
         rights of  creditors  generally  and by  general  principles  of equity
         (regardless of whether  considered in a proceeding in equity or at law)
         and (ii) each Operative  Document  (other than the Trust  Agreement) to
         which Owner Trustee is or will be a party constitutes,  or when entered
         into will constitute,  the legal, valid and binding obligation of Owner
         Trustee, enforceable against Owner Trustee in accordance with the terms
         thereof except as may be limited by applicable bankruptcy,  insolvency,
         reorganization,  moratorium,  or similar laws  affecting  the rights of
         creditors  generally and by general principles of equity (regardless of
         whether considered in a proceeding in equity or at law).

                  (e)  Title.  On the Closing Date Owner  Trustee  will  receive
         whatever  title  to the  Undivided  Interest  in the  Facility  and the
         Undivided  Interest  in the  Site  as is  conveyed  to it by  NACC,  as
         applicable,  free and clear of all Lessor Liens arising by,  through or
         under Trust Company or Owner Trustee.

                  (f)  Chief Executive  Office.  The chief place of business and
         the chief executive  office of Owner Trustee is located in Los Angeles,
         California  and the  office  where  Owner  Trustee  keeps  its  records
         concerning  the Facility  and the  Undivided  Interest  therein and the
         Operative  Documents  to which Owner  Trustee is a party are located in
         Los Angeles, California.

                  Section 5.6 Offerings by Parties.  Each of NACC,  HCNA,  Owner
Trustee,  Trust  Company  and Owner  Participant  represents,  individually  and
separately,  but not  jointly,  to each  other  party  hereto  that,  except  as
expressly  contemplated in the Operative  Documents,  neither it, nor any of its
Affiliates nor anyone authorized to act on its behalf as agent,  broker,  dealer
or otherwise has directly or indirectly offered any interest in the Trust Estate
or in any similar security  relating to the Facility,  the Site or the Undivided
Interests  therein,  or in any security of NACC,  HCNA, or the Owner Trustee the
offering of which for purposes of the  Securities Act would be deemed to be part
of the same offering as any offering of interests in the Trust Estate,  for sale
to, or  solicited  any offer to acquire any of the same from,  any Person  other
than the Owner  Participant and the institutions  referred to in the certificate
described in Section 4.1(aa).


                                       31

<PAGE>




                  Section   5.7   Representations   and   Warranties   Regarding
Investment. Owner Participant represents and warrants to each other party hereto
that Owner Participant is acquiring its interest in the Trust Estate for its own
account  for  investment  and not  with a view  to any  resale  or  distribution
thereof,  and if in the future the Owner Participant should decide to dispose of
its interest in the Trust Estate, the Owner Participant  understands that it may
do so only in compliance with the applicable requirements of the Securities Act;
provided,  however,  that,  subject to the  provisions of Section 6.4 and of the
Trust  Agreement,  the  disposition of the Owner  Participant's  interest in the
Trust Estate shall be at all times within the Owner Participant's control.


                                   ARTICLE VI

                                    COVENANTS

                  Section 6.1 Covenants of NACC.  NACC covenants and agrees with
each of the other parties as follows:

                  (a)  Covenants  of NACC During  Basic  Term.  From the date of
         this Agreement and until the end of the Basic Term:

                                    (i) Existence. Except as expressly permitted
                  in  Section  6.1(a)(iv),  6.1(b)(ii),  6.2(h),  6.3(a)(ii)  or
                  6.3(b)(ii),  NACC  will  do or  cause  to be done  all  things
                  necessary  to  preserve  and keep in full force and effect its
                  existence,  rights  (charter and  statutory)  and  franchises;
                  provided, however, that NACC shall not be required to preserve
                  any such right or  franchise if the Board of Directors of NACC
                  in good faith shall determine that the preservation thereof is
                  no longer desirable in the conduct of the business of NACC and
                  that the loss thereof is not  disadvantageous  in any material
                  respect to the Owner Participant.

                                    (ii) Reporting  Requirements.  (A) Financial
                  Statements.   In  the  event   NACC   shall  no  longer  be  a
                  consolidated  Subsidiary  of HCNA,  NACC will  furnish  to the
                  Owner Participant:

                                    (1) as soon as  available,  but in any event
                           within 90 days after the end of each  fiscal  year of
                           NACC,  a copy  of the  audited  consolidated  balance
                           sheets of NACC and its  consolidated  Subsidiaries as
                           at the  end of  such  fiscal  year  and  the  related
                           audited   consolidated   statements   of  income  and
                           retained  earnings  and of cash flows for such fiscal
                           year,  setting forth in each case in comparative form
                           the figures for the previous fiscal year, reported on
                           without a "going  concern" or like  qualification  or
                           exception,  or qualification arising out of the scope
                           of  the   audit,   by  Coopers  &  Lybrand  or  other
                           independent    certified   public    accountants   of
                           nationally recognized standing; and



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<PAGE>



                                    (2) as soon as  available,  but in any event
                           not later  than 45 days  after the end of each of the
                           first three quarterly  periods of each fiscal year of
                           NACC,  the unaudited  consolidated  balance sheets of
                           NACC and its consolidated  Subsidiaries as at the end
                           of such  fiscal  quarter  and the  related  unaudited
                           consolidated   statements   of  income  and  retained
                           earnings   and  of  cash   flows   of  NACC  and  its
                           consolidated Subsidiaries for such fiscal quarter and
                           the  portion of the fiscal  year  through  the end of
                           such fiscal  quarter,  setting  forth in  comparative
                           form the budget for such  period and the  figures for
                           the  same  period  of  the   previous   fiscal  year,
                           certified  by  the  chief  financial  officer  or the
                           treasurer  of  NACC as  being  fairly  stated  in all
                           material  respects  (subject to normal year-end audit
                           adjustments).

                           All such financial  statements  shall be complete and
                  correct in all  material  respects  and shall be  prepared  in
                  accordance  with  generally  accepted  accounting   principles
                  applied consistently  throughout the periods reflected therein
                  and with prior periods (except as approved by such accountants
                  or officer, as the case may be, and disclosed therein).

                           (B) Certificates. If NACC shall not be a consolidated
                  subsidiary   of  HCNA,   NACC  will   furnish   to  the  Owner
                  Participant:

                                    (1)  concurrently  with the  delivery of the
                           financial   statements   referred   to   in   Section
                           6.1(a)(ii)(A)(1),   a  letter  from  the  independent
                           certified  public   accountants   reporting  on  such
                           financial  statements  (x) stating that in making the
                           examination   necessary  therefor  no  knowledge  was
                           obtained   of  any   non-compliance   with   Sections
                           6.1(a)(iii)  and 6.1(a)(iv) of this Agreement  during
                           the period  reported on  constituting a Default or an
                           Event of Default  except as specified in such letter,
                           (y) stating that such  accountants  have reviewed the
                           calculations   in  the   certificates  of  the  chief
                           financial  officer or the treasurer of NACC delivered
                           concurrently with such financial  statements pursuant
                           to   Section    6.1(a)(ii)(B)(2)(y)    and    Section
                           6.1(a)(ii)(D)  of this  Participation  Agreement  and
                           confirmed  such  calculations,  and (z) stating  that
                           such accountants have reviewed the  reconciliation of
                           generally  accepted  accounting  principles  as  then
                           applied   in  the   preparation   of  the   financial
                           statements of NACC and Generally Accepted  Accounting
                           Principles, and confirmed that such reconciliation as
                           presented in such certificates of the chief financial
                           officer   or  the   treasurer   of   NACC   delivered
                           concurrently   with  such  financial   statements  is
                           complete and  correct,  or that there are no material
                           differences  between  generally  accepted  accounting
                           principles as then applied in the  preparation of the
                           financial  statements of NACC and Generally  Accepted
                           Accounting  Principles for the periods referred to in
                           such certificates; and



                                       33

<PAGE>



                                    (2)  concurrently  with the  delivery of the
                           financial   statements   referred   to   in   Section
                           6.1(a)(ii)(A),  a certificate of the chief  financial
                           officer or the  treasurer  of NACC (x)  stating  that
                           such officer has obtained no knowledge of any Default
                           or Event of Default, or of the occurrence of an Event
                           of Loss,  during the period  reported  on,  except as
                           specified  in such  certificate  and (y)  showing  in
                           detail the calculations of Consolidated  Tangible Net
                           Worth,  the  Fixed  Charge  Coverage  Ratio  and  the
                           Interest  Coverage Ratio,  as applicable,  supporting
                           such  statement in respect of Section  6.1(a)(iv)  of
                           this   Agreement,   if   applicable,    including   a
                           reconciliation  of any material  differences  between
                           generally  accepted  accounting  principles  as  then
                           applied  in  the   preparation   of  such   financial
                           statements   and   Generally   Accepted    Accounting
                           Principles.

                           (C) Other Information. NACC will furnish to the Owner
                  Participant:

                                    (1) prompt  notice of any change in the name
                           of NACC or the location of the chief executive office
                           and place of business of NACC and the office where it
                           keeps its records  concerning  the  Facility  and the
                           operation thereof;

                                    (2) notices  described  in Section 11 of the
                           Lease, as and when required by said Section 11; and

                                    (3) promptly   upon   request   such   other
                           financial  information  with  respect  to  NACC,  the
                           Facility  and the  Complex as Owner  Participant  may
                           reasonably request.

                           (D) Notices.  To the extent that the chief  executive
                  officer,  the president,  the chief  financial  officer or the
                  treasurer  of NACC knows or should  reasonably  be expected to
                  know  thereof,  NACC will  promptly  give  notice to the Owner
                  Participant   of  any  Asset   Disposition   made  or  merger,
                  consolidation,  sale of  assets or other  transaction  entered
                  into or made  pursuant to Section  6.1(a)(iii),  6.1(a)(iv) or
                  6.1(b)(ii),  as  applicable.  Each  notice  pursuant  to  this
                  Section 6.1(a)(ii)(D) shall be accompanied by a certificate of
                  the chief  financial  officer or the treasurer of NACC showing
                  in detail the calculations of Consolidated Tangible Net Worth,
                  the Fixed  Charge  Coverage  Ratio and the  Interest  Coverage
                  Ratio,  as applicable,  supporting the  determination  by NACC
                  that the transaction  complies with the applicable  provisions
                  of this Agreement,  including a reconciliation of any material
                  differences between generally accepted  accounting  principles
                  as then applied in the preparation of financial statements and
                  Generally Accepted Accounting Principles.

                                    (iii) Limitation     on    Certain     Asset
                           Dispositions.  Except with the prior written  consent
                           of the Owner Participant,  which consent shall not be
                           unreasonably withheld,  NACC shall not, and shall not
                           permit any


                                       34

<PAGE>



                           Restricted  Subsidiary  of NACC to,  make  any  Asset
                           Disposition  in one or more related  transactions  by
                           NACC or a Restricted Subsidiary of NACC, unless:

                                    (A)  NACC or the  Restricted  Subsidiary  of
                           NACC, as applicable,  receives consideration for such
                           Asset Disposition,  the fair market value of which is
                           at least equal to the fair market value of the assets
                           sold or  disposed of as  determined  in good faith by
                           (1) a designated  officer of NACC (or so long as NACC
                           is a  Restricted  Subsidiary  of HCNA,  a  designated
                           officer of HCNA), as evidenced by a certificate filed
                           with the Owner Participant,  if such consideration is
                           less than $5 million,  or (2) the Board of  Directors
                           of  NACC  (or  so  long  as  NACC  is  a   Restricted
                           Subsidiary of HCNA,  the Board of Directors of HCNA),
                           as  evidenced  by a Board  Resolution  filed with the
                           Owner Participant,  if such consideration is equal to
                           or greater than $5 million; and

                                    (B) (1) at  least  75% of the  consideration
                           for  such  Asset  Disposition  consists  of  cash  or
                           readily marketable Cash Equivalents or the assumption
                           of Debt of HCNA or of a Restricted Subsidiary of HCNA
                           (in a principal  amount (or accreted  value) equal to
                           the fair market  value of the assets sold or disposed
                           of) and a  release  from  all  liability  on the Debt
                           assumed; or

                                    (2) immediately  after giving effect to such
                           Asset  Disposition,  the aggregate  consideration for
                           all Asset  Dispositions  during the Initial  Term and
                           the  Basic  Term  that  does not  consist  of cash or
                           readily marketable Cash Equivalents or the assumption
                           of Debt of HCNA or of a Restricted Subsidiary of HCNA
                           (in a principal  amount (or accreted  value) equal to
                           the fair market  value of the assets sold or disposed
                           of) and a  release  from  all  liability  on the Debt
                           assumed will not be in excess of $45 million; and

                                    (C) 100% of the Net Available Proceeds, less
                           proceeds in an aggregate amount not exceeding (1) $15
                           million  during  any  12-month  period,  and  (2) $90
                           million  during the Interim  Term and the Basic Term,
                           are   invested   within   180  days  of  such   Asset
                           Disposition,  in  the  business  of  HCNA  or in  any
                           business  related to the  business  of HCNA or any of
                           its Restricted Subsidiaries,  including the repayment
                           or   retirement  of  Debt  of  HCNA  or  any  of  its
                           Restricted Subsidiaries,  provided, that at all times
                           prior to such investment,  such proceeds are invested
                           in Cash Equivalents; and

                                    (D) immediately   before  and  after  giving
                           effect to such  transaction no Event of Default shall
                           have occurred and be continuing; and



                                       35

<PAGE>



                                    (E) in any such  transaction  involving  any
                           material component of the Complex,  immediately after
                           giving  effect  to  such   transaction  all  material
                           components of the Complex,  the Host  Facilities  and
                           the Service  Facilities will be controlled,  directly
                           or indirectly, by the same Person.

                           The  foregoing   provisions  shall  not  apply  to  a
                  transaction  consummated in compliance  with the provisions of
                  Section  6.1(a)(iv),  and this Section  6.1(a)(iii)  shall not
                  apply  to  (x)  any  Asset  Disposition  which  constitutes  a
                  transfer,  conveyance, sale, lease or other disposition of all
                  or substantially  all of NACC's properties or assets or of all
                  or  substantially  all  of  the  properties  and  assets  that
                  comprise the Complex within the meaning of Section 6.1(a)(iv),
                  (y)  any  Asset  Disposition  which  constitutes  a  transfer,
                  conveyance,  sale,  lease  or  other  disposition  of  all  or
                  substantially  all of HCNA's  properties  or assets within the
                  meaning of Section 6.2(h),  or (z) any Asset  Disposition as a
                  result  of  which  the  HCNA  Guaranty   shall   terminate  in
                  accordance with Section 13 of the HCNA Guaranty.

                                    (iv)  Mergers,  Consolidations  and  Certain
                           Sales  of  Assets.  Except  with  the  prior  written
                           consent of the Owner Participant, which consent shall
                           not be  unreasonably  withheld,  NACC (A)  shall  not
                           consolidate  with or  merge  into  any  other  Person
                           (other  than  HCNA or any  Restricted  Subsidiary  of
                           HCNA),  (B) shall  not  permit  any  other  Person to
                           consolidate  with or merge into NACC (other than HCNA
                           or any Restricted Subsidiary of HCNA), (C) shall not,
                           directly or indirectly, transfer, convey, sell, lease
                           or otherwise  dispose of all or substantially  all of
                           its properties and assets as an entirety to any other
                           Person (other than HCNA or any Restricted  Subsidiary
                           of HCNA),  (D) shall  not,  directly  or  indirectly,
                           transfer, convey, sell, lease or otherwise dispose of
                           all or substantially all of the properties and assets
                           that comprise the Complex as an entirety to any other
                           Person (other than HCNA or any Restricted  Subsidiary
                           of HCNA), and (E) shall not,  directly or indirectly,
                           enter   into   or   otherwise   participate   in  any
                           reorganization  or other  transaction  or  series  of
                           related  transactions  as a result of which it ceases
                           to be a Restricted Subsidiary of HCNA, unless:

                                    (1) in the case NACC shall  consolidate with
                           or merge  into  another  Person,  shall  directly  or
                           indirectly transfer, convey, sell, lease or otherwise
                           dispose of all or substantially all of its properties
                           and assets or the properties and assets that comprise
                           the  Complex as an  entirety,  or shall  directly  or
                           indirectly enter into or otherwise participate in any
                           reorganization  or other  transaction  or  series  of
                           related  transactions  as a result of which it ceases
                           to be a  Restricted  Subsidiary  of HCNA,  the Person
                           formed by such  consolidation  or into  which NACC is
                           merged,   the  Person  which  acquires  by  transfer,
                           conveyance,  sale, lease or other  disposition all or
                           substantially  all of the  properties  and  assets of
                           NACC or


                                       36

<PAGE>



                           the  properties  and assets that comprise the Complex
                           as an entirety,  or the Person which  succeeds to the
                           interest of NACC as a result of any reorganization or
                           other  transaction or series of related  transactions
                           in which NACC ceases to be a Restricted Subsidiary of
                           HCNA (for purposes of this Section, a "NACC Successor
                           Company")  shall  be a  corporation,  partnership  or
                           trust,  shall be organized and validly existing under
                           the laws of the United  States of America,  any State
                           thereof  or  the   District  of  Columbia  and  shall
                           expressly   assume  by  an   agreement  in  form  and
                           substance   reasonably   satisfactory  to  the  Owner
                           Participant all of the obligations of NACC under this
                           Participation  Agreement  and  each  other  Operative
                           Document   to  which,   immediately   prior  to  such
                           transaction,  NACC was a party, including the due and
                           punctual  performance and observance of each covenant
                           and  condition  of  the  Operative  Documents  to  be
                           performed or observed by NACC; and

                                    (2) immediately  after giving effect to such
                           transaction,

                                            (v) the  Consolidated  Tangible  Net
                                     Worth  of  NACC  or  the   NACC   Successor
                                     Company,  as  applicable,  will be at least
                                     equal to the greater of (a) $50 million and
                                     (b) 95% of the  Consolidated  Tangible  Net
                                     Worth  of HCNA  immediately  prior  to such
                                     transaction; or

                                            (w) the  Consolidated  Tangible  Net
                                     Worth of HCNA will be at least equal to the
                                     greater of (a) $50  million  and (b) 95% of
                                     the Consolidated Tangible Net Worth of HCNA
                                     immediately prior to such transaction; or

                                            (x) the Interest  Coverage  Ratio of
                                     NACC  or the  NACC  Successor  Company,  as
                                     applicable,  will be no less  than  3.00 to
                                     1.00 and the Fixed Charge Coverage Ratio of
                                     NACC  or the  NACC  Successor  Company,  as
                                     applicable,  will be no less  than  1.75 to
                                     1.00; or

                                            (y) the Interest  Coverage  Ratio of
                                     HCNA  will be no less than 3.00 to 1.00 and
                                     the  Fixed  Charge  Coverage  Ratio of HCNA
                                     will be no less than 1.75 to 1.00; or

                                            (z) the  outstanding  Debt of either
                                     (a) NACC or the NACC Successor Company,  as
                                     applicable,  or (b) HCNA,  with an  Average
                                     Weighted  Life equal to or greater than the
                                     Average  Weighted  Life  of  the  remaining
                                     Basic  Rent  during the Basic Term shall be
                                     rated   at  least   BBB-   (or   subsequent
                                     equivalent  rating) by Standard & Poor's or
                                     at  least  Baa3 (or  subsequent  equivalent
                                     rating)  by  Moody's,  or  if  either  such
                                     agency no longer


                                       37

<PAGE>



                                     publishes  ratings,   then  the  equivalent
                                     rating  as  published  by  another   Rating
                                     Agency; and

                                    (3)  immediately  before  and  after  giving
                           effect to such  transaction no Event of Default shall
                           have occurred and be continuing; and

                                    (4) in any such  transaction  involving  any
                           material component of the Complex,  immediately after
                           giving  effect  to  such   transaction  all  material
                           components of the Complex,  the Host  Facilities  and
                           the Service  Facilities will be controlled,  directly
                           or indirectly, by the same Person.

                           Notwithstanding    the   foregoing,    this   Section
                  6.1(a)(iv)  shall not apply to any  merger,  consolidation  or
                  sale of assets as a result  of which the HCNA  Guaranty  shall
                  terminate in accordance with Section 13 of the HCNA Guaranty.

                  (b)  Covenants of NACC During  Remaining  Lease Term. From the
         date on which the Basic Term ends and until the end of the Lease Term:

                                    (i) Existence; Reporting Requirements.  NACC
                           will  observe  the  covenants  set  forth in  Section
                           6.1(a)(i) and Section  6.1(a)(ii)(A),  6.1(a)(ii)(B),
                           6.1(a)(ii)(C) and, as to any merger, consolidation or
                           sale  of  assets  pursuant  to  Section   6.1(b)(ii),
                           6.1(a)(ii)(D).

                                    (ii)  Mergers,  Consolidations  and  Certain
                           Sales  of  Assets.  Except  with  the  prior  written
                           consent of the Owner Participant, which consent shall
                           not be  unreasonably  withheld,  NACC (A)  shall  not
                           consolidate  with or  merge  into  any  other  Person
                           (other  than  HCNA or any  Restricted  Subsidiary  of
                           HCNA),  (B) shall  not  permit  any  other  Person to
                           consolidate  with or merge into NACC (other than HCNA
                           or any Restricted  Subsidiary of HCNA), and (C) shall
                           not, directly or indirectly,  transfer, convey, sell,
                           lease or  otherwise  dispose of all or  substantially
                           all of its  properties  and assets as an  entirety to
                           any other Person  (other than HCNA or any  Restricted
                           Subsidiary  of HCNA),  (D)  shall  not,  directly  or
                           indirectly,   transfer,   convey,   sell,   lease  or
                           otherwise  dispose of all or substantially all of the
                           properties and assets that comprise the Complex as an
                           entirety to any other Person  (other than HCNA or any
                           Restricted  Subsidiary  of HCNA),  and (E) shall not,
                           directly  or  indirectly,  enter  into  or  otherwise
                           participate   in   any    reorganization   or   other
                           transaction  or series of related  transactions  as a
                           result  of  which  it  ceases  to  be  a   Restricted
                           Subsidiary of HCNA, unless:

                                     (1) in the case NACC shall consolidate with
                                    or merge into another Person, shall directly
                                    or indirectly transfer,  convey, sell, lease
                                    or otherwise dispose of all or substantially
                                    all  of its  properties  and  assets  or the
                                    properties and assets that comprise the


                                       38

<PAGE>



                                    Complex as an entirety, or shall directly or
                                    indirectly    enter   into   or    otherwise
                                    participate in any  reorganization  or other
                                    transaction    or    series    of    related
                                    transactions  as a result of which it ceases
                                    to be a Restricted  Subsidiary of HCNA,  the
                                    NACC   Successor    Company   shall   be   a
                                    corporation,  partnership or trust, shall be
                                    organized  and  validly  existing  under the
                                    laws of the United  States of  America,  any
                                    State  thereof or the  District  of Columbia
                                    and shall  expressly  assume by an agreement
                                    in    form    and    substance    reasonably
                                    satisfactory to the Owner Participant all of
                                    the   obligations   of   NACC   under   this
                                    Participation   Agreement   and  each  other
                                    Operative  Document  to  which,  immediately
                                    prior to such transaction, NACC was a party,
                                    including  the due and punctual  performance
                                    and   observance   of  each   covenant   and
                                    condition of the  Operative  Documents to be
                                    performed or observed by NACC;

                                     (2) immediately after giving effect to such
                                    transaction,  the Consolidated  Tangible Net
                                    Worth of NACC or the NACC Successor Company,
                                    as  applicable,  (or of  HCNA,  if the  HCNA
                                    Guaranty is then in effect) will be at least
                                    equal  to 95% of the  Consolidated  Tangible
                                    Net Worth of HCNA immediately  prior to such
                                    transaction;

                                     (3)  immediately  before  and after  giving
                                    effect  to  such  transaction  no  Event  of
                                    Default   shall   have   occurred   and   be
                                    continuing; and

                                     (4) in any such  transaction  involving any
                                    material    component    of   the   Complex,
                                    immediately  after  giving  effect  to  such
                                    transaction  all material  components of the
                                    Complex, the Host Facilities and the Service
                                    Facilities  will be controlled,  directly or
                                    indirectly, by the same Person.

                                    Notwithstanding the foregoing,  this Section
                           6.1(b)(ii)   shall   not   apply   to   any   merger,
                           consolidation  or sale of assets as a result of which
                           the HCNA Guaranty shall  terminate in accordance with
                           Section 13 of the HCNA Guaranty.

                                    (c) Cooperation. So long as no Facility User
                           Event  of  Default  (as   defined  in  the   Services
                           Agreement) has occurred and is  continuing,  upon the
                           request of Owner  Participant or Owner Trustee,  NACC
                           shall,   at  the   expense   of  Owner   Participant,
                           reasonably cooperate with Owner Participant and Owner
                           Trustee in obtaining the valid and effective issuance
                           or transfer or amendment,  as the case may be, of all
                           approvals,   notices,  filings,  consents,   waivers,
                           exemptions,  variances,  franchises, orders, permits,
                           authorizations,   certificates,   licenses  or  other
                           actions required to


                                       39

<PAGE>



                           be taken,  given, made, or obtained,  as the case may
                           be, by, from,  to or with any  applicable  Authority,
                           necessary or, reasonably desirable for the ownership,
                           operation and  possession of the Undivided  Interests
                           in the Facility or the Site or any  property  covered
                           by the Site Lease by Owner  Trustee or any  permitted
                           transferee, lessee or assignee thereof for the period
                           after the Lease Termination Date to the expiration or
                           termination of the Site Lease Term.

                                    (d) Investigation       by      Governmental
                           Authorities.  To the extent  permitted by  Applicable
                           Law,  during  the Lease  Term NACC  shall  deliver to
                           Owner  Trustee and Owner  Participant  promptly  upon
                           NACC's  becoming aware of or receiving  notice of the
                           intent  by  an  Authority  to  (i)   investigate  the
                           Facility  or the Site  for  possible  violation  of a
                           statute under which material liability may be imposed
                           upon  Owner  Participant  or  Owner  Trustee  or (ii)
                           investigate   the   Facility  or  the  Site  for  any
                           violation  of  applicable  law under  which  criminal
                           liability  may be  imposed  on Owner  Participant  or
                           Owner Trustee.

                                    (e) Limitation on Certain Rights of NACC. As
                           and to the extent more specifically  described in the
                           applicable  Section,  NACC  shall  not  exercise  its
                           rights  under  Sections  12, 15, 20, 21 and 22 of the
                           Lease,  as the case may be, unless NACC  concurrently
                           shall be  exercising  all similar  rights it may have
                           under the Other Lease.

                                    (f) Environmental  Compliance.   During  the
                           Lease Term NACC shall:

                                     (i) except to the extent NACC is engaged in
                                    a Permitted Contest with respect thereto, at
                                    its sole  cost and  expense,  comply  in all
                                    respects,  and cause all  other  Persons  to
                                    comply   in   all    respects,    with   all
                                    Environmental    Laws   now   or   hereafter
                                    applicable   to   the   use,   modification,
                                    construction,  operation and  maintenance of
                                    the Facility, the Site, the Leasehold Estate
                                    and the Undivided Interests therein;

                                     (ii)  except to the extent  NACC is engaged
                                    in a Permitted Contest with respect thereto,
                                    obtain,     in    full    compliance    with
                                    Environmental  Laws, all Approvals  required
                                    under  any  Environmental  Law for the  use,
                                    modification,  construction,  operation  and
                                    maintenance  of the  Facility  and the  Site
                                    and,  to the extent  applicable  to the use,
                                    modification,   construction,  operation  or
                                    maintenance of the Facility or the Site, the
                                    Complex,  in the  regular  course  of NACC's
                                    business as  contemplated  by the  Operative
                                    Documents  and, to the extent then  required
                                    in accordance  with any  Environmental  Law,
                                    any other use of the


                                       40

<PAGE>



                                    Facility  or the  Site,  and  maintain  such
                                    Approvals  in full  force  and  effect,  and
                                    comply  fully with the terms and  conditions
                                    thereof;

                                    (iii) not dispose of, Release, treat, store,
                           use,  recycle,  or generate  Hazardous  Materials  or
                           permit such activities at the Facility, the Site, the
                           Leasehold Estate or the Undivided  Interests therein,
                           or   transport  or  permit  the   transportation   of
                           Hazardous  Materials  to or from  the  Facility,  the
                           Site, the Leasehold Estate or the Undivided Interests
                           therein,  other than in the regular  course of NACC's
                           business   and   in   full    compliance   with   all
                           Environmental Laws and Environmental Approvals;

                                    (iv) not install or permit the  installation
                           at the  Site  or  the  Facility  of  any  underground
                           storage    tanks,     surface     impoundments     or
                           asbestos-containing  materials and NACC will cause or
                           ensure that the Site and the  Facility  will be used,
                           modified, constructed,  operated and maintained so as
                           to prevent  exposure of any Person at the Site or the
                           Facility to  Hazardous  Materials in excess of safety
                           levels  established by  Environmental  Laws and so as
                           not to result in  liability  under any  Environmental
                           Laws;

                                    (v) except to the extent  NACC is engaged in
                           a Permitted Contest with respect thereto, conduct and
                           complete   at  its   sole   cost  and   expense   any
                           investigation,   study,   sampling,   monitoring  and
                           testing and undertake any cleanup, removal, remedial,
                           corrective,  mitigation, response or any other action
                           required under  Environmental  Laws,  with respect to
                           Hazardous  Materials at the Facility,  the Site,  the
                           Leasehold Estate or the Undivided  Interests therein,
                           and  any  such  activity  shall  be  undertaken  with
                           appropriate diligence and in full compliance with all
                           Environmental Laws;

                                    (vi)  provide  Owner  Participant  and Owner
                           Trustee  with  reasonably  detailed  written  notice,
                           promptly  upon a  Responsible  Environmental  Manager
                           becoming aware thereof,  of (a) any written notice to
                           or  from  an   Authority  of  an  actual  or  alleged
                           violation  of or  non-compliance  with  Environmental
                           Laws or any  reportable  Release or other  reportable
                           exceedance   involving  a  Hazardous   Material  with
                           respect  to the  Facility,  the Site,  the  Leasehold
                           Estate or the Undivided  Interests  therein;  and (b)
                           any   pending  or  overtly   threatened   in  writing
                           Environmental  Claim against or involving  NACC,  the
                           Facility,  the  Site,  the  Leasehold  Estate  or the
                           Undivided  Interests therein or any other Person with
                           respect  to the  Facility,  the Site,  the  Leasehold
                           Estate or the Undivided  Interests therein,  which is
                           reasonably  expected  to  (i)  result  in a  material
                           liability or (ii) result in serious  personal  injury
                           or material property damage or allegations thereof or
                           (iii) have a material adverse effect on the Facility,
                           the  Site,  the  Leasehold  Estate  or the  Undivided
                           Interests therein;


                                       41

<PAGE>




                                    (vii)  with  respect  to  matters  for which
                           notice is  provided  pursuant  to Section  6.1(f)(vi)
                           above,  such  notice  shall also be provided to Owner
                           Participant  and Owner  Trustee  with  respect to the
                           Complex,  to the  extent  any  Special  Environmental
                           Expenses as to any  individual  item for which notice
                           is provided under Section 6.1(f)(vi) would reasonably
                           be expected to reach or exceed $750,000;

                                    (viii) provide Owner  Participant  and Owner
                           Trustee  during  each  fiscal year of NACC with (x) a
                           reasonably detailed written environmental  assessment
                           report  concerning the Facility and the Site, and (y)
                           the Environmental Report prepared annually for NACC's
                           lenders pursuant to its Working Capital Facilities by
                           Eder Associates or any other Environmental Consultant
                           concerning the Facility, the Site and the Complex, or
                           an equivalent report;

                                    (ix) promptly  upon  receipt,  provide Owner
                           Participant  and  Owner  Trustee  with  copies of all
                           written  communications   relating  to  any  of  such
                           matters  for which  notice is  provided  pursuant  to
                           Section   6.1(f)(vi)   above  and,   within  10  days
                           following  NACC's  issuance  or  receipt  of (a)  any
                           written  environmental  report,  environmental notice
                           letter or other written  environmental  communication
                           to or from any Authority,  (b) any pending or overtly
                           threatened  written  Environmental  Claim  or (c) any
                           press  release  relating  to (a) or (b) above,  shall
                           provide to Owner Participant and Owner Trustee copies
                           of all such written reports, notice letters,  written
                           communications,   Environmental   Claims   and  press
                           releases;

                                    (x)  at  its  sole  cost  and  expense,   in
                           compliance  with  all   Environmental   Laws  and  in
                           accordance with reasonably  prudent  industry customs
                           and standards, diligently and in good faith implement
                           each of the observations set forth in the letter from
                           Geomatrix Consultants, Inc., dated July 1, 1996; and

                                    (xi) except to the extent NACC is engaged in
                           a Permitted Contest with respect thereto,  comply and
                           cause  all   other   Persons   to  comply   with  all
                           Environmental  Laws  with  respect  to  the  Complex,
                           except to the extent any violation or  non-compliance
                           would not  reasonably  be  expected  to result in (a)
                           Special  Environmental  Expenses (after giving effect
                           to the proceeds of any applicable  insurance owing by
                           a  carrier  which has  acknowledged  in  writing  its
                           liability  under  the  relevant  policy  and  to  any
                           applicable  indemnities  owing to NACC  from a Person
                           which is reasonably likely to honor its indemnity) in
                           an aggregate  amount  equalling  or  exceeding  $12.5
                           million  for  any  fiscal  year  of  NACC  or (b) the
                           imposition  of  criminal  liability  (y) on the Owner
                           Participant,  OP  Guarantor  or Owner  Trustee or (z)
                           which would prevent or significantly


                                       42

<PAGE>



                           interfere  with  the  continued  use,   operation  or
                           maintenance of the Complex.

                           (g) Expenses.  At all times during the Lease Term and
                  thereafter  if a Processing  Services  Election has been made,
                  NACC shall pay (i) to Owner Trustee,  Power  Contract  Trustee
                  and  Owner  Participant  all  expenses   (including,   without
                  limitation,  legal fees and expenses)  reasonably  incurred by
                  such party in connection  with the entering into, or giving or
                  withholding, of any future amendments,  supplements,  waivers,
                  approvals,  consents or other actions in  connection  with any
                  Default or Event of Default or that are  requested  by NACC or
                  HCNA and (ii) the ongoing fees and  expenses of Owner  Trustee
                  and Power Contract  Trustee under the Trust  Agreement and the
                  Power Contract Trust Agreement, respectively.

                           (h) Site Lease. NACC agrees during the Lease Term, to
                  perform all  covenants  and  obligations  (including,  without
                  limitation,   payment  obligations,  which  amounts  shall  be
                  payable as  Supplemental  Rent) imposed by the Site Lease upon
                  Tenant directly, for the benefit of Site Lessor thereunder.

                           (i)  Lessor  Security.  (i) At all times on and after
                  the Closing Date through the expiration or earlier termination
                  of the Basic Term (other than a termination  as a result of an
                  Event of Default  during the Basic Term),  NACC shall cause to
                  be provided and  maintained  in full force and effect a Letter
                  of  Credit  issued  in favor of Owner  Participant;  provided,
                  however, that no Letter of Credit shall be required (x) at any
                  time after the senior  unsecured debt obligations of HCNA that
                  mature on or after the scheduled  expiration date of the Basic
                  Term have been rated  continuously for a period of at least 12
                  months at least BBB (or a  subsequent  equivalent  rating)  by
                  Standard & Poor's,  at least Baa2 (or a subsequent  equivalent
                  rating) by Moody's or at least 2 (or a  subsequent  equivalent
                  rating) by the National Association of Insurance Commissioners
                  (or if such  agencies  no  longer  publish  ratings,  then the
                  equivalent  rating as published by another  Rating  Agency) or
                  (y) at any time when NACC shall be  maintaining a Cash Deposit
                  and such Cash  Deposit  shall be subject to a first  priority,
                  perfected  security  interest  in favor  of Owner  Participant
                  pursuant  to the  Lessor  Security  Agreement.  If a Letter of
                  Credit is being provided pursuant to this Section 6.1(i) by an
                  Issuing  Bank that does not satisfy the criteria in clause (i)
                  of the  definition of "Eligible  Bank" and a downgrade of such
                  Issuing Bank's credit rating shall occur such that the Issuing
                  Bank no longer  satisfies  the  criteria in clause (ii) of the
                  definition  of  "Eligible   Bank,"  (A)  NACC  shall  cause  a
                  replacement  Letter  of  Credit  to be  issued in favor of the
                  Owner  Participant  no later than 60 days after NACC  acquires
                  actual  knowledge,   or  receives  a  notice  from  the  Owner
                  Participant,  of the  occurrence of such downgrade and (B) the
                  Owner Participant  shall immediately  surrender any Letters of
                  Credit so replaced to the issuer thereof for cancellation.



                                       43

<PAGE>



                                    (ii)  Owner  Participant  may  draw  on  any
                           Letter of Credit  provided  pursuant to this  Section
                           6.1(i)  if any of the  following  shall  occur and be
                           continuing (each, a "Drawing Event"):

                           (v) an Event of  Default  of the  type  specified  in
                  Section  17(a) of the  Lease  based on the  failure  to make a
                  payment of Basic Rent;

                           (w) an Event of  Default  of the  type  specified  in
                  Section  17(a) of the  Lease  based on the  failure  to make a
                  payment of Stipulated Loss Value where the difference  between
                  (A) the amount  due and  payable  and (B) the amount  actually
                  paid is greater than $500,000;

                           (x) an Event of  Default  of the  type  specified  in
                  Section  17(b) of the Lease  based on the  failure to make any
                  payment  where the  difference  between (A) the amount due and
                  payable  and (B) the  amount  actually  paid is  greater  than
                  $500,000;

                           (y) the  Letter of Credit  shall  not be  renewed  or
                  replaced  by  another  Letter  of  Credit  at  least  ten (10)
                  Business  Days  prior  to the  expiration  of such  Letter  of
                  Credit; or

                           (z) NACC shall  fail to replace  any Letter of Credit
                  within 60 days of the  downgrade  of the credit  rating of the
                  Issuing Bank in  accordance  with the last sentence of Section
                  6.1(i).

         If the Owner Participant draws on the Letter of Credit as a result of a
         Drawing  Event of the type  specified  in clause (v), (w) or (x) above,
         the  proceeds  of such  drawing  shall be first  applied  to the failed
         payment to which such  Drawing  Event  relates  and the balance of such
         drawing,  if any,  shall be applied to the payment of  scheduled  Basic
         Rent payments in inverse order of due dates by crediting  such proceeds
         against the actual  scheduled  amounts of such Basic Rent payments.  If
         Owner  Participant  draws on the  Letter  of  Credit  as a result  of a
         Drawing  Event of the type  specified  in clause (y) or (z) above,  the
         proceeds of such  drawing  shall be applied to the payment of scheduled
         Basic Rent  payments in inverse  order of due dates by  crediting  such
         proceeds  against  the  actual  scheduled  amounts  of such  Basic Rent
         payments.  Notwithstanding  the foregoing,  no drawing on the Letter of
         Credit or  application of the proceeds of any such draw shall be deemed
         to cure any Default or Event of Default  upon which such drawing may be
         based.

                           (j) Legal  Description  of Site.  NACC shall promptly
                  process a lot-line  adjustment or parcel map application  with
                  San Bernardino  County,  which will create a legal parcel that
                  is co-terminus  with the Sites, and (i) obtain said adjustment
                  or parcel map within four (4) months  from the  Closing  Date;
                  (ii) execute  amendments to the Lease, Site Lease,  Memorandum
                  of Lease and each Memorandum of Site Lease and other documents
                  necessary  to  change  the legal  description  of the Sites in
                  accordance with said adjustment or parcel map and/or


                                       44

<PAGE>



                  terminate  a Site Lease,  if  appropriate;  (iii)  record such
                  amendments to Memorandum of Lease and each  Memorandum of Site
                  Lease; and (iv) obtain  appropriate  endorsements to the title
                  insurance  policies  issued  pursuant  to  this  Participation
                  Agreement  insuring  the Owner  Trustee's  interest in the new
                  legal  parcel.  All costs and expenses  incurred in connection
                  with all of the foregoing, including the cost of recording any
                  such amendments to the Memorandum of Lease and each Memorandum
                  of Site Lease, shall be the obligation of and paid by NACC.

                           (k) Power Purchase  Agreements.  Notwithstanding  any
                  provision  of the  Power  Contract  Assignment  or  any  other
                  Operative Document to the contrary,  during the Sub-Assignment
                  Term (as defined in the Power Contract  Assignment),  NACC (i)
                  shall be  solely  liable  for,  and  shall  comply  with,  all
                  obligations   of  the  "Seller"   under  the  Power   Purchase
                  Agreements,  (ii) shall not  amend,  modify or  terminate,  or
                  consent to or permit any amendment, modification, termination,
                  waiver or  variance  of any of the Power  Purchase  Agreements
                  without  the  prior  written  consent  of the  Power  Contract
                  Trustee,  (iii) shall provide the Power  Contract  Trustee and
                  the   Owner   Participant   with  a  copy   of  all   notices,
                  correspondence  and  other  documents  relating  to the  Power
                  Purchase  Agreements received or delivered by NACC (other than
                  billing and other materials relating to operations received or
                  delivered in the ordinary course of business), (iv) until such
                  time as the  Settlement  Agreement,  effective  July 15,  1996
                  between  NACC  and  the  Power  Purchaser,  has  received  all
                  necessary regulatory approvals and has become effective, shall
                  provide  the Power  Contract  Trustee  and  Owner  Participant
                  statements, certified by a Responsible Officer of NACC, within
                  60 days after the end of each fiscal quarter of NACC,  setting
                  forth the energy sales for such  quarter  (whether in the form
                  of steam or electricity) by purchaser,  reasonably  acceptable
                  to the Owner  Participant  and (v) shall provide notice of any
                  non-compliance   with   the   reporting   requirements   under
                  Applicable  Law  relating  to  the  Facility's   status  as  a
                  Qualifying Facility.

                  Section 6.2 Covenants of HCNA During Basic Term. From the date
of this  Agreement  and until the  earlier  of the end of the Basic Term and the
release of the HCNA Guaranty in accordance with Section 13 of the HCNA Guaranty,
HCNA covenants:

                  (a)  Existence.  Except  as  expressly  permitted  in  Section
         6.2(h), 6.3(a)(ii) or 6.3(b)(ii),  HCNA will do or cause to be done all
         things  necessary  to  preserve  and keep in full  force and effect its
         existence,  rights  (charter and statutory) and  franchises;  provided,
         however,  that HCNA shall not be required to preserve any such right or
         franchise  if the  Board  of  Directors  of HCNA in  good  faith  shall
         determine that the  preservation  thereof is no longer desirable in the
         conduct  of the  business  of HCNA and that  the  loss  thereof  is not
         disadvantageous in any material respect to the Owner Participant.



                                       45

<PAGE>



                  (b)  Reporting  Requirements.  (i) Financial Statements.  HCNA
                  will furnish to the Owner Participant:

                           (A) as soon as available,  but in any event within 90
                  days after the end of each fiscal year of HCNA,  a copy of the
                  audited consolidated and consolidating  balance sheets of HCNA
                  and its consolidated Subsidiaries as at the end of such fiscal
                  year and the related audited  consolidated  and  consolidating
                  statements  of income and retained  earnings and of cash flows
                  for  such  fiscal  year,   setting   forth  in  each  case  in
                  comparative  form the figures for the  previous  fiscal  year,
                  reported on without a "going concern" or like qualification or
                  exception,  or  qualification  arising out of the scope of the
                  audit,  by  Coopers & Lybrand or other  independent  certified
                  public accountants of nationally recognized standing; and

                           (B) as soon as available,  but in any event not later
                  than  45  days  after  the  end of  each  of the  first  three
                  quarterly  periods of each fiscal year of HCNA,  the unaudited
                  consolidated and consolidating  balance sheets of HCNA and its
                  consolidated Subsidiaries as at the end of such fiscal quarter
                  and  the  related  unaudited  consolidated  and  consolidating
                  statements  of income and retained  earnings and of cash flows
                  of HCNA and its  consolidated  Subsidiaries  for  such  fiscal
                  quarter and the portion of the fiscal year  through the end of
                  such fiscal  quarter,  setting forth in  comparative  form the
                  budget for such  period and the figures for the same period of
                  the  previous  fiscal year,  certified by the chief  financial
                  officer or the treasurer of HCNA as being fairly stated in all
                  material   respects   (subject   to  normal   year-end   audit
                  adjustments).

         All such  financial  statements  shall be  complete  and correct in all
         material  respects and shall be prepared in accordance  with  generally
         accepted  accounting  principles  applied  consistently  throughout the
         periods reflected therein and with prior periods (except as approved by
         such  accountants  or  officer,  as the  case  may  be,  and  disclosed
         therein).

                           (ii) Certificates;   Other  Information.   HCNA  will
         furnish to the Owner Participant:

                           (A)  concurrently  with the delivery of the financial
                  statements referred to in Section 6.2(b)(i)(A),  a letter from
                  the independent certified public accountants reporting on such
                  financial   statements   (1)   stating   that  in  making  the
                  examination  necessary  therefor no knowledge  was obtained of
                  any non-compliance  with Section 6.2(d) through Section 6.2(h)
                  of this Agreement during the period reported on constituting a
                  Default or an Event of  Default  except as  specified  in such
                  letter,  (2) stating that such  accountants  have reviewed the
                  calculations  in  the  certificates  of  the  chief  financial
                  officer or the treasurer of HCNA delivered  concurrently  with
                  such financial statements pursuant to Section 6.2(b)(ii)(B)(2)
                  and Section 6.2(b)(iii)(C) of this Participation Agreement and
                  confirmed  such  calculations,   and  (3)  stating  that  such
                  accountants  have  reviewed  the  reconciliation  of generally
                  accepted   accounting   principles  as  then  applied  in  the
                  preparation of


                                       46

<PAGE>



                  the  financial  statements  of  HCNA  and  Generally  Accepted
                  Accounting Principles,  and confirmed that such reconciliation
                  as  presented  in such  certificates  of the  chief  financial
                  officer or the treasurer of HCNA delivered  concurrently  with
                  such  financial  statements  is complete and correct,  or that
                  there are no material  differences  between generally accepted
                  accounting  principles as then applied in the  preparation  of
                  the  financial  statements  of  HCNA  and  Generally  Accepted
                  Accounting  Principles  for the  periods  referred  to in such
                  certificates;

                           (B)  concurrently  with the delivery of the financial
                  statements referred to in Section 6.2(b)(i),  a certificate of
                  the  chief  financial  officer  or the  treasurer  of HCNA (1)
                  stating  that such  officer has  obtained no  knowledge of any
                  Default or Event of Default,  or of the occurrence of an Event
                  of Loss, during the period reported on, except as specified in
                  such certificate and (2) showing in detail the calculations of
                  the Fixed Charge Coverage Ratio, the Interest  Coverage Ratio,
                  the Consolidated  Cash Flow Ratio,  and Consolidated  Tangible
                  Net Worth, as applicable, supporting such statement in respect
                  of  Section  6.2(d)  through  6.2(h)  of  this  Agreement,  if
                  applicable,   including  a  reconciliation   of  any  material
                  differences between generally accepted  accounting  principles
                  as  then  applied  in  the   preparation   of  such  financial
                  statements and Generally Accepted Accounting Principles;

                           (C)  within  five  Business  Days  after the same are
                  filed,  copies of all financial  statements  and reports which
                  HCNA or any of its  Restricted  Subsidiaries  may make to,  or
                  file with,  the  Securities  and  Exchange  Commission  or any
                  successor or analogous governmental authority;

                           (D)  prompt  notice of any change in the  location of
                  the chief  executive  office and place of  business or name of
                  HCNA; and

                           (E)  promptly  upon  request  such  other   financial
                  information with respect to HCNA, the Facility and the Complex
                  as Owner Participant may reasonably request.

                           (iii) Notices. To the extent that the chief executive
         officer, the president, the chief financial officer or the treasurer of
         HCNA knows or should reasonably be expected to know thereof,  HCNA will
         promptly give notice to the Owner Participant of:

                           (A)  the occurrence of any Default,  Event of Default
                  or Event of Loss;

                           (B)  any  development  or  event  which  is  (in  the
                  reasonable  judgment of such officer)  reasonably  expected to
                  have a Material Adverse Effect; and



                                       47

<PAGE>



                           (C)   any   Asset   Disposition   made   or   merger,
                  consolidation  or sale of assets entered into or made pursuant
                  to  Section  6.2(g)  or  6.2(h)  or  Section  6.3(a)(ii),   as
                  applicable.

         Each  notice  pursuant  to  Section  6.2(b)(iii)(A)  or  (B)  shall  be
         accompanied  by  a  statement  of  the  chief  executive  officer,  the
         president, the chief financial officer or the treasurer of HCNA setting
         forth  details of the  occurrence  referred to therein and stating what
         action  HCNA or NACC,  as  applicable,  proposes  to take with  respect
         thereto.  Each  notice  pursuant  to  Section  6.2(b)(iii)(C)  shall be
         accompanied  by a  certificate  of the chief  financial  officer or the
         treasurer of HCNA showing in detail the  calculations  of  Consolidated
         Tangible Net Worth,  the Fixed Charge  Coverage  Ratio and the Interest
         Coverage Ratio,  as applicable,  supporting the  determination  by HCNA
         that the  transaction  complies with the applicable  provisions of this
         Agreement,  including  a  reconciliation  of any  material  differences
         between generally accepted accounting principles as then applied in the
         preparation of financial  statements and Generally Accepted  Accounting
         Principles.

                           (iv) Financial  Statements  for  Most  Recent  Fiscal
Year.  Within five (5) Business  Days of the Closing  Date,  HCNA shall  deliver
audited  financial  statements  with  respect to its fiscal year ended March 30,
1996 to the holders of its Debt to whom such  financial  statements are required
to be delivered.

                  (c)  Working  Capital.  HCNA  will use  reasonable  commercial
         efforts to  maintain  working  capital  availability  adequate  for the
         conduct of its business,  consistent  with  historical  working capital
         availability,  including at all times Working  Capital  Facilities  (or
         other similar financial  arrangements) in a maximum aggregate principal
         amount  permitted to be  outstanding  at any time of not less than $100
         million.

                  (d) Financial  Condition  Covenants.  HCNA will not permit the
         Fixed Charge Coverage Ratio or the Interest  Coverage Ratio of HCNA for
         any period of four consecutive  fiscal quarters ending during any "Test
         Period" to be less than the ratio set forth opposite for the applicable
         period under the heading "Test Period Ending" below:


                                    Fixed Charge                    Interest
Test Period Ending                 Coverage Ratio                Coverage Ratio
- - ------------------                 --------------                --------------

September 30, 1996                 1.15 to 1.00                  1.40 to 1.00

December 31, 1996                  1.15 to 1.00                  1.40 to 1.00

March 31, 1997 and                 1.20 to 1.0                   1.50 to 1.00
thereafter


         If  (i)  highway   deicing  salt  sales  of  HCNA  and  its  Restricted
         Subsidiaries  for any fiscal  year of HCNA fall below the Target  Sales
         for such period, as determined at the end of


                                       48

<PAGE>



         the fourth  quarter of such fiscal year and (ii) HCNA fails to meet the
         Fixed  Charge  Coverage  Ratio or the Interest  Coverage  Ratio for any
         period of four  consecutive  fiscal quarters which includes such fourth
         fiscal quarter,  the failure by HCNA to meet such Fixed Charge Coverage
         Ratio or Interest Coverage Ratio for such period in accordance with the
         first  paragraph of this Section 6.2(d) will not constitute an Event of
         Default, provided, that:

                           (A) such  failure  would not have  occurred  if,  for
                  purposes of  calculating  such Fixed Charge  Coverage Ratio or
                  Interest Coverage Ratio, as applicable,  an addition to HCNA's
                  gross profits in such fourth fiscal quarter were to be made in
                  an amount (not to exceed  $7,500,000)  equal to the product of
                  (1) the amount by which  highway  deicing salt sales (in tons)
                  of HCNA and its Restricted  Subsidiaries  for such fiscal year
                  fell below the Target Sales for such period, multiplied by (2)
                  the Gross Margin for such fiscal year;

                           (B) this  waiver  shall  cease  to  apply  (i) to any
                  failure  to  meet  the  Fixed  Charge  Coverage  Ratio  or the
                  Interest  Coverage Ratio,  as applicable,  which continues for
                  longer than four (4)  consecutive  fiscal quarters of HCNA, or
                  (ii) to any failure to meet the Fixed Charge Coverage Ratio or
                  the Interest Coverage Ratio, as applicable, which occurs after
                  this waiver with  respect to any such failure has been applied
                  on four (4) occasions during the Basic Term; and

                           (C) the  decline  in  highway  deicing  salt sales of
                  HCNA,  to the extent  resulting  in the pro forma  addition to
                  gross profits under clause (A) above,  related  exclusively to
                  fluctuations in demand caused by weather conditions.

                  Notwithstanding the foregoing, any failure by HCNA to meet the
         Fixed Charge  Coverage Ratio or Interest  Coverage Ratio for any period
         of four  consecutive  fiscal  quarters in accordance with the first and
         the second  paragraphs  of this Section  6.2(d) will not  constitute an
         Event of Default,  if the Fixed Charge  Coverage  Ratio or the Interest
         Coverage Ratio of HCNA, as applicable, for a period of four consecutive
         fiscal  quarters  ending with either the first or second fiscal quarter
         following  any such  period is not less than the  applicable  ratio set
         forth opposite the relevant "Test Period" above.

                  On or before  November  30 of each year,  HCNA  shall  provide
         Owner Participant with an Officer's  Certificate setting forth the Salt
         Commitments  for the current fiscal year of HCNA which shall be used in
         making all calculations  under this Section 6.2(d) with respect to such
         fiscal year.

                  (e)  Limitation  on Restricted  Payments.  HCNA (i) shall not,
         directly  or  indirectly,  declare  or pay any  dividend,  or make  any
         distribution,  of any kind or character  (whether in cash,  property or
         securities)  in  respect  of any class of its  Capital  Stock or to the
         holders of any class of its Capital Stock  (including  payments by HCNA
         to the  stockholders of HCNA pursuant to a merger or  consolidation  of
         HCNA,  but excluding any dividends or  distributions  payable solely in
         shares of its Capital Stock


                                       49

<PAGE>



         (other than Disqualified Stock) or in options, warrants or other rights
         to acquire its Capital  Stock  (other than  Disqualified  Stock),  (ii)
         shall  not,  and shall not permit any  Restricted  Subsidiary  of HCNA,
         directly or  indirectly,  to purchase,  redeem or otherwise  acquire or
         retire for value (A) any Capital Stock of HCNA or any Related Person of
         either  HCNA or the Parent  Company,  or (B) any  options,  warrants or
         rights to  purchase or acquire  shares of Capital  Stock of HCNA or any
         Related  Person of either HCNA or the Parent  Company,  (iii) shall not
         make,  or  permit  any  Restricted  Subsidiary  of  HCNA to  make,  any
         Investment  in, or payment on a  Guarantee  of any  obligation  of, any
         Affiliate of HCNA (other than HCNA or a Restricted  Subsidiary of HCNA)
         or any Related  Person of either HCNA or the Parent  Company,  and (iv)
         shall not, and shall not permit any  Restricted  Subsidiary of HCNA to,
         make any Investment in any Unrestricted Subsidiary, exceeding, together
         with  all  Investments  made by HCNA in its  Unrestricted  Subsidiaries
         after the date of this Participation Agreement, the aggregate amount of
         dividends or distributions  of any kind or character  (whether in cash,
         property  or  securities)   received  by  HCNA  from  its  Unrestricted
         Subsidiaries  after  the  date of  this  Participation  Agreement  (the
         transactions  described in subsections  (i) through (iv) being referred
         to herein as "Restricted Payments"), unless:

                           (A)  no Event of Default  shall have  occurred and be
                  continuing; and

                           (B)  upon giving  effect to such  Restricted Payment,
                  the  Consolidated  Cash Flow Ratio of HCNA and the  Restricted
                  Subsidiaries  of HCNA for the four full  fiscal  quarters  for
                  which quarterly or annual  financial  statements are available
                  next preceding the date of such Restricted Payment, calculated
                  on a pro forma  basis as if such  Restricted  Payment had been
                  made at the beginning of such four full fiscal quarters, shall
                  be greater than 2.25 to 1.00.

                  Notwithstanding  the  foregoing,  HCNA (1) may  make,  and may
         permit any Restricted  Subsidiary of HCNA to make,  Restricted Payments
         in  exchange  for,  or  out  of  the  proceeds  of,  the  substantially
         concurrent  issue or sale (other  than to a  Restricted  Subsidiary  of
         HCNA) of  shares of  HCNA's  Capital  Stock  (other  than  Disqualified
         Stock), except in each case to the extent that cash or other payment is
         to be paid or  distributed  by or on behalf of HCNA in connection  with
         such transaction;  (2) may make payments to the Parent Company of up to
         $850,000  in any  fiscal  year to the extent  necessary  for the Parent
         Company  to pay  reasonable  administrative  expenses  in the  ordinary
         course of  business;  (3) may make  payments to the Parent  Company and
         other  Persons to the extent  necessary  to permit  the  repurchase  of
         shares of the Common Stock of HCNA or the Parent  Company or options on
         such shares from  employees or former  employees  (or their  estates or
         beneficiaries under their estates) upon death,  disability,  retirement
         or termination  of employment of any such Person  pursuant to the terms
         of any agreement under which such shares or options were issued,  in an
         amount not in excess of $2 million in any twelve-month  period; (4) may
         make  payments to the Parent  Company  and other  Persons to the extent
         necessary  to permit the  repurchase  of shares of the Common  Stock of
         HCNA or the Parent Company from  stockholders who are not Affiliates or
         Related Persons of HCNA or the Parent Company up to an aggregate


                                       50

<PAGE>



         amount of $15  million;  and (5) may  declare or pay  dividends  on its
         Capital Stock, following a public offering of the Capital Stock of HCNA
         or the  Parent  Company,  of up to 6% per  annum  of the  net  proceeds
         received  by HCNA in  such  public  offering,  provided,  that  the net
         proceeds  received  by HCNA as a result of such public  offering  shall
         have been used to repay or retire Debt of HCNA or any of its Restricted
         Subsidiaries.  Notwithstanding the foregoing,  (x) for each fiscal year
         following  March 30, 1996, the permitted  amounts under clauses (2) and
         (3) above  shall be  multiplied  by the CPI-U  Factor in effect at such
         time and (y) for purposes of  calculating  the amounts of payments made
         under clauses (3) and (4), such amounts shall be net of the proceeds of
         any  disposition of such Common Stock to Persons other than HCNA or any
         Restricted  Subsidiary.  The foregoing  limitations do not prevent HCNA
         from  paying a dividend  on Capital  Stock of any class  within 60 days
         after the  declaration  thereof if, on the date when the  dividend  was
         declared,  HCNA could have paid such  dividend in  accordance  with the
         provisions of this Section 6.2(e).

                  (f)  Limitation on  Transactions  with  Affiliates.  Except as
         expressly  permitted in the  Operative  Documents,  HCNA shall not, and
         shall not permit any  Restricted  Subsidiary of HCNA to, enter into any
         transaction  (or series of related  transactions)  with an Affiliate or
         Related  Person of either  HCNA or the Parent  Company,  including  any
         Investment,  either directly or indirectly, unless such transaction (or
         series of related  transactions) is fair and reasonable to HCNA or such
         Restricted  Subsidiary  of HCNA, as the case may be, and on terms which
         are at least as favorable as those available from a Person which is not
         an  Affiliate or Related  Person.  Any such  transaction  (or series of
         related  transactions)  that  involves in excess of $5 million shall be
         approved by a majority  of the Board of  Directors  of HCNA,  provided,
         that any such  transaction  (or  series of related  transactions)  that
         involves  in excess of $10  million  (i) shall  also be  approved  by a
         majority of the  directors  of the Board of  Directors of HCNA that are
         disinterested  with respect to such  transaction  (or series of related
         transactions),  if any,  and  (ii)  shall  be  subject  to the  further
         requirement  that HCNA  obtain an  opinion of a  nationally  recognized
         expert with  experience in appraising  the terms and  conditions of the
         type of transaction  (or series of related  transactions)  stating that
         the  transaction  or series of  related  transactions  is fair  (from a
         financial  point  of  view)  to  HCNA  or  such  Subsidiary.   For  any
         transaction  that involves in excess of $200,000 but less than or equal
         to $5 million, HCNA shall deliver to the Owner Participant an Officer's
         Certificate  evidencing  that  such  transaction  satisfies  the  above
         criteria.

                  The  foregoing  paragraph  shall not be  applicable to (A) tax
         sharing  agreements  substantially  as in  effect  at the  date of this
         Agreement  (except for changes  made to take account of changes in law)
         between HCG, Subsidiaries of HCG, HCNA and HCNA's Subsidiaries, (B) any
         transaction among HCNA and its Restricted  Subsidiaries,  (C) the Joint
         Compensation Agreement,  dated as of October 28, 1993, among HCNA, HCG,
         North American  Chemical  Company,  North American Salt Company,  Great
         Salt Lake Minerals Corporation, D. George Harris, Anthony J. Petrocelli
         and Richard J.  Donahue  and (D) the  Services  Agreement,  dated as of
         October 28, 1993, between HCNA and HCG.


                                       51

<PAGE>




                  Notwithstanding the foregoing, any Affiliate or Related Person
         of HCNA or the  Parent  Company  who is an  individual  may  serve as a
         director,  officer,  employee  or  consultant  of  HCNA  or  any of its
         Restricted   Subsidiaries  and  receive   reasonable   compensation  or
         indemnification  in  connection  with  his  or  her  services  in  such
         capacity,  plus reimbursement of reasonable expenses,  including travel
         and entertainment  expenses,  directly relating to the business of HCNA
         or any of its Restricted Subsidiaries,  provided, that compensation per
         annum and indemnification of each such individual in excess of $250,000
         shall be  approved  by a  majority  of the  directors  of the  Board of
         Directors of HCNA,  and HCNA shall deliver to the Owner  Participant an
         Officer's Certificate evidencing such approval and specifying each such
         individual and the capacity in which he or she serves.

                  (g) Limitation on Certain Asset Dispositions.  Except with the
         prior written consent of the Owner Participant, which consent shall not
         be  unreasonably  withheld,  HCNA shall  not,  and shall not permit any
         Restricted  Subsidiary of HCNA to, make any Asset Disposition in one or
         more related  transactions by HCNA or a Restricted  Subsidiary of HCNA,
         unless:

                           (i) HCNA or the  Restricted  Subsidiary  of HCNA,  as
                  applicable, receives consideration for such Asset Disposition,
                  the fair  market  value of which is at least equal to the fair
                  market  value of the assets sold or disposed of as  determined
                  in  good  faith  by  (A) a  designated  officer  of  HCNA,  as
                  evidenced by a certificate  filed with the Owner  Participant,
                  if such  consideration  is less  than $5  million,  or (B) the
                  Board of Directors of HCNA, as evidenced by a Board Resolution
                  filed with the Owner  Participant,  if such  consideration  is
                  equal to or greater than $5 million; and

                           (ii) (A) at least 75% of the  consideration  for such
                  Asset Disposition  consists of cash or readily marketable Cash
                  Equivalents  or  the  assumption  of  Debt  of  HCNA  or  of a
                  Restricted  Subsidiary  of HCNA  (in a  principal  amount  (or
                  accreted  value)  equal to the fair market value of the assets
                  sold or disposed of) and a release  from all  liability on the
                  Debt assumed; or

                           (B)  immediately  after  giving  effect to such Asset
                  Disposition,   the  aggregate   consideration  for  all  Asset
                  Dispositions  during the Initial  Term and the Basic Term that
                  does  not   consist  of  cash  or  readily   marketable   Cash
                  Equivalents  or  the  assumption  of  Debt  of  HCNA  or  of a
                  Restricted  Subsidiary  of HCNA  (in a  principal  amount  (or
                  accreted  value)  equal to the fair market value of the assets
                  sold or disposed of) and a release  from all  liability on the
                  Debt assumed will not be in excess of $75 million; and

                           (iii)  100%  of  the  Net  Available  Proceeds,  less
                  proceeds in an aggregate  amount not exceeding (A) $25 million
                  during any 12-month  period,  and (B) $150 million  during the
                  Interim Term and the Basic Term, are invested  within 180 days
                  of such Asset  Disposition,  in the business of HCNA or in any
                  business


                                       52

<PAGE>



                  related  to the  business  of  HCNA  or any of its  Restricted
                  Subsidiaries, including the repayment or retirement of Debt of
                  HCNA or any of its Restricted Subsidiaries,  provided, that at
                  all times prior to such investment, such proceeds are invested
                  in Cash Equivalents; and

                           (iv) immediately  before and after  giving  effect to
                  such  transaction  no Event of Default shall have occurred and
                  be continuing; and

                           (v) in any such  transaction  involving  any material
                  component of the Complex,  immediately  after giving effect to
                  such transaction all material  components of the Complex,  the
                  Host Facilities and the Service Facilities will be controlled,
                  directly or indirectly, by the same Person.

                  Notwithstanding the foregoing,  any Asset Disposition by Sifto
         of collateral securing the Sifto Notes or Debt of Sifto that refinances
         the Sifto Notes shall not be subject to the foregoing  requirements  so
         long as the Sifto Notes are outstanding or so long as any Debt of Sifto
         that  refinances  the Sifto  Notes is  outstanding  and  which  Debt is
         secured and contains provisions  substantially  similar to Section 1020
         of the Sifto Note  Indenture.  In addition,  the  foregoing  provisions
         shall not apply to a transaction  consummated  in  compliance  with the
         provisions of Section  6.2(h),  and this Section 6.2(g) shall not apply
         to (A) any Asset Disposition which constitutes a transfer,  conveyance,
         sale, lease or other  disposition of all or substantially all of HCNA's
         properties or assets within the meaning of Section  6.2(h),  or (B) any
         Asset  Disposition  as a  result  of  which  the  HCNA  Guaranty  shall
         terminate in accordance with Section 13 of the HCNA Guaranty.

                  (h)  Mergers,  Consolidations  and  Certain  Sales of  Assets.
         Except with the prior written consent of the Owner  Participant,  which
         consent  shall  not  be  unreasonably  withheld,  HCNA  (i)  shall  not
         consolidate  with or  merge  into  any  other  Person  (other  than any
         Restricted  Subsidiary of HCNA), (ii) shall not permit any other Person
         to  consolidate  with or merge  into HCNA  (other  than any  Restricted
         Subsidiary  of HCNA),  (iii) shall not permit any other  Person  (other
         than any Restricted Subsidiary of HCNA) to consolidate with, merge into
         or be merged into by, any  Restricted  Subsidiary  (in a transaction in
         which such  Restricted  Subsidiary  (or successor  person)  remains (or
         becomes) a  Restricted  Subsidiary),  and (iv) shall not,  directly  or
         indirectly,  transfer,  convey, sell, lease or otherwise dispose of all
         or substantially all of its properties and assets as an entirety to any
         other Person (other than any Restricted Subsidiary of HCNA), unless:

                           (A) in the case HCNA shall  consolidate with or merge
                  into another Person or shall directly or indirectly  transfer,
                  convey,   sell,   lease  or   otherwise   dispose  of  all  or
                  substantially all of its properties and assets as an entirety,
                  the Person formed by such  consolidation or into which HCNA is
                  merged or the Person which  acquires by transfer,  conveyance,
                  sale, lease or other  disposition all or substantially  all of
                  the properties and assets of HCNA as an entirety (an


                                       53

<PAGE>



                  "HCNA Successor Company") shall be a corporation,  partnership
                  or trust,  shall be organized and validly  existing  under the
                  laws of the United States of America, any State thereof or the
                  District  of  Columbia  and  shall  expressly   assume  by  an
                  agreement in form and substance reasonably satisfactory to the
                  Owner  Participant  all of the  obligations of HCNA under this
                  Participation  Agreement and each other Operative  Document to
                  which,  immediately  prior  to such  transaction,  HCNA  was a
                  party,   including  the  due  and  punctual   performance  and
                  observance  of each  covenant and  condition of the  Operative
                  Documents to be performed or observed by HCNA; and

                           (B)  immediately   after   giving   effect   to  such
                  transaction,

                                    (1) (x) the Consolidated  Tangible Net Worth
                           of NACC will be at least  equal to the greater of (a)
                           $50 million and (b) 95% of the Consolidated  Tangible
                           Net   Worth  of  HCNA   immediately   prior  to  such
                           transaction  and (y) the Interest  Coverage  Ratio of
                           NACC  will be no less than 3.00 to 1.00 and the Fixed
                           Charge  Coverage  Ratio of NACC  will be no less than
                           1.75 to 1.00; or

                                    (2) (x) the Consolidated  Tangible Net Worth
                           of HCNA or the HCNA Successor Company, as applicable,
                           will be at  least  equal  to the  greater  of (a) $50
                           million and (b) 95% of the Consolidated  Tangible Net
                           Worth of HCNA  immediately  prior to such transaction
                           and (y) the  Interest  Coverage  Ratio of HCNA or the
                           HCNA Successor  Company,  as  applicable,  will be no
                           less than 3.00 to 1.00 and the Fixed Charge  Coverage
                           Ratio  of  HCNA or the  HCNA  Successor  Company,  as
                           applicable, will be no less than 1.75 to 1.00; or

                                    (3) the outstanding  Debt of either (x) NACC
                           or  (y)  HCNA  or  the  HCNA  Successor  Company,  as
                           applicable, with an Average Weighted Life equal to or
                           greater  than  the  Average   Weighted  Life  of  the
                           remaining Basic Rent during the Basic Term,  shall be
                           rated at least BBB- (or subsequent equivalent rating)
                           by Standard & Poor's or at least Baa3 (or  subsequent
                           equivalent  rating)  by  Moody's,  or if either  such
                           agency  no  longer   publishes   ratings,   then  the
                           equivalent  rating as  published  by  another  Rating
                           Agency; and

                           (C)  immediately  before and after  giving  effect to
                  such  transaction  no Event of Default shall have occurred and
                  be continuing; and

                           (D)  in any such  transaction  involving any material
                  component of the Complex,  immediately  after giving effect to
                  such transaction all material  components of the Complex,  the
                  Host Facilities and the Service Facilities will be controlled,
                  directly or indirectly, by the same Person.



                                       54

<PAGE>



                  Notwithstanding  the foregoing,  this Section 6.2(h) shall not
         apply to (1) any  merger,  consolidation  or sale of assets  subject to
         Section  6.1(a)(iv) or (2) any merger,  consolidation or sale of assets
         as a result of which the HCNA  Guaranty  shall  terminate in accordance
         with Section 13 of the HCNA Guaranty.

                  (i) Cooperation.  So long as no Facility User Event of Default
         (as defined in the Services  Agreement) has occurred and is continuing,
         upon the request of Owner Participant or Owner Trustee,  HCNA shall, at
         the  expense  of Owner  Participant,  reasonably  cooperate  with Owner
         Participant  and Owner  Trustee in  obtaining  the valid and  effective
         issuance  or  transfer  or  amendment,  as  the  case  may  be,  of all
         approvals, notices, filings, consents, waivers, exemptions,  variances,
         franchises, orders, permits, authorizations,  certificates, licenses or
         other actions required to be taken,  given,  made, or obtained,  as the
         case may be, by, from, to or with any applicable  Authority,  necessary
         or reasonably desirable for the ownership,  operation and possession of
         the  Undivided  Interests  in the  Facility or the Site or any property
         covered by the Site Lease by Owner Trustee or any permitted transferee,
         lessee or assignee  thereof for the period after the Lease  Termination
         Date to the expiration or termination of the Site Lease Term.

                  Section 6.3 Covenants of HCNA After Basic Term.

                  (a) Covenants of HCNA During  Remaining  Lease Term.  From the
date on which the Basic Term ends and until the  earlier of the end of the Lease
Term and the release of the HCNA Guaranty in  accordance  with Section 13 of the
HCNA Guaranty, HCNA covenants as follows:

                  (i)  Existence; Reporting Requirements.  HCNA will observe the
         covenants set forth in Section 6.2(a) and Section  6.2(b)(i),  (ii) and
         (iii)(A)  and,  as to any  merger,  consolidation  or  sale  of  assets
         pursuant to Section 6.3(a)(ii), Section 6.2(b)(iii)(C).

                  (ii)  Mergers,  Consolidations  and  Certain  Sales of Assets.
         Except with the prior written consent of the Owner  Participant,  which
         consent  shall  not  be  unreasonably  withheld,  HCNA  (A)  shall  not
         consolidate  with or  merge  into  any  other  Person  (other  than any
         Restricted  Subsidiary of HCNA),  (B) shall not permit any other Person
         to  consolidate  with or merge  into HCNA  (other  than any  Restricted
         Subsidiary of HCNA),  (C) shall not permit any other Person (other than
         any Restricted  Subsidiary of HCNA) to consolidate  with, merge into or
         be merged into by, any Restricted Subsidiary (in a transaction in which
         such Restricted Subsidiary (or successor person) remains (or becomes) a
         Restricted  Subsidiary),  and (D) shall not,  directly  or  indirectly,
         transfer,   convey,   sell,  lease  or  otherwise  dispose  of  all  or
         substantially  all of its  properties  and assets as an entirety to any
         other Person (other than any Restricted Subsidiary of HCNA), unless:

                           (1) in the case HCNA shall  consolidate with or merge
                  into another Person or shall directly or indirectly  transfer,
                  convey,   sell,   lease  or   otherwise   dispose  of  all  or
                  substantially all of its properties and assets as an entirety,
                  the


                                       55

<PAGE>



                  HCNA Successor Company shall be a corporation,  partnership or
                  trust,  shall be organized and validly existing under the laws
                  of the  United  States of  America,  any State  thereof or the
                  District  of  Columbia  and  shall  expressly   assume  by  an
                  agreement in form and substance reasonably satisfactory to the
                  Owner  Participant  all of the  obligations of HCNA under this
                  Participation  Agreement and each other Operative  Document to
                  which,  immediately  prior  to such  transaction,  HCNA  was a
                  party,   including  the  due  and  punctual   performance  and
                  observance  of each  covenant and  condition of the  Operative
                  Documents to be performed or observed by HCNA;

                           (2)   immediately   after   giving   effect  to  such
                  transaction,  the  Consolidated  Tangible Net Worth of HCNA or
                  the HCNA Successor  Company,  as applicable,  will be at least
                  equal to 95% of the  Consolidated  Tangible  Net Worth of HCNA
                  immediately prior to such transaction;

                           (3)   immediately  before and after giving  effect to
                  such  transaction  no Event of Default shall have occurred and
                  be continuing; and

                           (4)   in any such transaction involving  any material
                  component of the Complex,  immediately  after giving effect to
                  such transaction all material  components of the Complex,  the
                  Host Facilities and the Service Facilities will be controlled,
                  directly or indirectly, by the same Person.

                  Notwithstanding  the foregoing,  this Section 6.3(a)(ii) shall
         not apply to (1) any merger, consolidation or sale of assets subject to
         Section  6.1(b)(ii) or (2) any merger,  consolidation or sale of assets
         as a result of which the HCNA  Guaranty  shall  terminate in accordance
         with Section 13 of the HCNA Guaranty.

                  (b) Covenants of HCNA After Lease Term. From the date on which
the Lease Term ends and until the  earlier of the end of the Site Lease Term and
the  release of the HCNA  Guaranty  in  accordance  with  Section 13 of the HCNA
Guaranty, HCNA covenants as follows:

                                    (i)   Existence.   HCNA  will   observe  the
                           covenants set forth in Section 6.2(a).

                                    (ii)  Mergers,  Consolidations  and  Certain
                           Sales  of  Assets.  Except  with  the  prior  written
                           consent of the Owner Participant, which consent shall
                           not be  unreasonably  withheld,  HCNA (A)  shall  not
                           consolidate  with or  merge  into  any  other  Person
                           (other than any Restricted  Subsidiary of HCNA),  (B)
                           shall not permit any other Person to consolidate with
                           or  merge  into  HCNA  (other  than  any   Restricted
                           Subsidiary of HCNA),  and (C) shall not,  directly or
                           indirectly,   transfer,   convey,   sell,   lease  or
                           otherwise  dispose of all or substantially all of its
                           properties  and  assets as an  entirety  to any other
                           Person (other than any Restricted


                                       56

<PAGE>



                           Subsidiary  of HCNA),  unless in the case HCNA  shall
                           consolidate  with or merge  into  another  Person  or
                           shall directly or indirectly transfer,  convey, sell,
                           lease or  otherwise  dispose of all or  substantially
                           all of its properties and assets as an entirety,  the
                           HCNA  Successor   Company  shall  be  a  corporation,
                           partnership or trust,  shall be organized and validly
                           existing  under  the  laws of the  United  States  of
                           America,   any  State  thereof  or  the  District  of
                           Columbia and shall  expressly  assume by an agreement
                           in form and substance reasonably  satisfactory to the
                           Owner  Participant  all of the  obligations  of  HCNA
                           under  this  Participation  Agreement  and each other
                           Operative  Document  to which,  immediately  prior to
                           such transaction, HCNA was a party, including the due
                           and  punctual  performance  and  observance  of  each
                           covenant and condition of the Operative  Documents to
                           be performed or observed by HCNA.

                  Notwithstanding  the foregoing,  this Section 6.3(b)(ii) shall
         not apply to any merger, consolidation or sale of assets as a result of
         which the HCNA Guaranty shall  terminate in accordance  with Section 13
         of the HCNA Guaranty.

                  Section 6.4 Covenants of Owner  Participant and Owner Trustee.
(a) Transfers of Owner Participant and Owner Trustee. With respect to a Transfer
by Owner Participant (x) during the Lease Term, unless an Event of Default shall
have occurred and be continuing  (in which case no transfer  restrictions  shall
apply other than clause (iii) below) and (y) after the termination or expiration
of the Lease  Term,  unless NACC shall have been  removed as Operator  under the
Services  Agreement for cause or if an NACC Event of Default,  (as defined under
the  Services  Agreement)  has  occurred  and is  continuing  (in which  case no
transfer  restrictions  shall  apply  other  than  clause  (iii)  below),  Owner
Participant  shall not  Transfer all or any portion of (and (A) during the Lease
Term, unless an Event of Default shall have occurred and be continuing and Owner
Trustee  is  exercising  remedies  under  Section  18  of  the  Lease,  and  (B)
thereafter,  unless NACC has been removed as Operator for cause or an NACC Event
of Default  (as  defined  under the  Services  Agreement)  has  occurred  and is
continuing,  Owner  Trustee shall not Transfer all or any portion of) its right,
title or  interest in and to the Trust  Estate,  the  Undivided  Interest in the
Facility,  the  Site,  the  Easement,  the  Leasehold  Estate  or the  Operative
Documents  during the Site Lease Term without the consent of NACC (other than to
the Other Owner Participant or to an Affiliate of Owner  Participant,  provided,
that the Affiliate  transferee  meets the  requirements of clause (ii) and (iii)
below  or  the  Affiliate  transferee's  obligations  are  guaranteed  by  Owner
Participant  or an Affiliate of Owner  Participant  having a tangible net worth,
calculated in accordance  with  generally  accepted  accounting  principles,  in
excess of $50,000,000 pursuant to a guaranty in substantially the form set forth
in Exhibit L and the  Affiliate  transferee is not directly or indirectly in the
borate  mining  or  soda  ash  business)  unless,  (i) the  transferee  is not a
Competitor;  (ii) (A) the transferee shall have a tangible net worth, calculated
in  accordance  with  generally  accepted  accounting  principles,  in excess of
$50,000,000 (or the transferee shall be a member of a consolidated  group having
such  tangible net worth) or (B) the  obligations  of the  transferee  under the
Operative  Documents  are  guaranteed  by a Person  pursuant  to a  guaranty  in
substantially  the form set forth in  Exhibit L that has a  tangible  net worth,
calculated in accordance  with  generally  accepted  accounting  principles,  in
excess of


                                       57

<PAGE>



$50,000,000;  (iii) the transferee enters into a Transfer  Agreement in the form
of  Exhibit  AA (or,  in the case of a  Transfer  by Owner  Trustee,  such other
documents  reasonably  acceptable to NACC reasonably required to accomplish such
Transfer)  and the  Transfer  involves  all but not less  than all of the  Owner
Participant's (or Owner Trustee's)  interest;  and (iv) NACC shall have received
an opinion of counsel (which counsel and opinion must be reasonably satisfactory
to NACC) to the  effect  that such  Transfer  is being made in  compliance  with
applicable securities laws and will not (x) result in the loss of, or revocation
by FERC of, the  Facility's  status as a Qualifying  Facility or (y) violate any
Legal  Requirements.  Owner  Participant shall be responsible for payment of all
reasonable   documented   out-of-pocket   costs,  fees  and  expenses  of  Owner
Participant,  Owner Trustee,  NACC and HCNA incurred in connection with any such
Transfer.

                  (b)  Transaction  Costs.  (i)  Subject  to the  provisions  of
Section 6.4(b)(ii), in the event the transactions contemplated by Section 2.1 to
occur on the Closing Date shall be consummated,  the Owner Trustee hereby agrees
that, with funds to be provided by the Owner  Participant for that purpose,  the
Owner  Trustee  shall  pay when due all  Transaction  Costs  for which a written
statement  or request has been  submitted to Owner  Participant  on or within 90
days after the Closing Date.  Subject to the  provisions of Section  6.4(b)(ii),
the Owner  Participant  shall  provide funds to the Owner Trustee for the timely
payment of Transaction Costs for which Owner Trustee is responsible  pursuant to
this Section 6.4(b)(i).

                  (ii)  Notwithstanding the provisions of Section 6.4(b)(i),  in
the event the  transactions  contemplated by Section 2.1 to occur on the Closing
Date shall not be consummated  for any reason,  NACC shall promptly pay or cause
to be paid, and shall indemnify,  defend and hold harmless Owner Participant and
Owner Trustee in respect of, all Transaction Costs incurred by Owner Participant
or Owner  Trustee,  unless such  failure to  consummate  shall result from Owner
Participant's  breach of its obligations  set forth in this Agreement,  in which
case NACC  shall  have no  obligation  with  respect  to any  Transaction  Costs
incurred by Owner Participant or Owner Trustee.

                  (c) Trust Agreement. Provided that (i) no Event of Default has
occurred  and is  continuing,  (ii) NACC has not been  removed  for cause as the
Operator  under the  Services  Agreement  and (iii) no NACC Event of Default (as
defined under the Services Agreement) has occurred and is continuing, during the
Site Lease Term,  without the prior written consent of NACC (which consent shall
not be  unreasonably  withheld),  Owner  Participant  shall not (x) terminate or
revoke,  or consent to the  termination or revocation of, the Trust Agreement or
the trust created  pursuant thereto and the Owner Trustee shall not terminate or
revoke, or consent to the termination or revocation of, the Power Contract Trust
Agreement or the trust created  pursuant  thereto and (y) Owner  Participant and
Owner Trustee shall not enter into amendment to the Trust Agreement or the Power
Contract Trust Agreement,  respectively, to the extent such amendment would have
a material  adverse  effect on the rights or interests of NACC or HCNA under the
Lease Financing Documents.

                  (d) Liens Attributable to Owner Participant. Owner Participant
covenants  and agrees with and for the benefit of Owner  Trustee,  NACC and HCNA
that Owner Participant will


                                       58

<PAGE>



not directly or indirectly create,  incur,  assume or suffer to exist any Lessor
Liens  attributable to it, and Owner Participant agrees that it will, at its own
cost  and  expense,  promptly  take  such  action  as may be  necessary  to duly
discharge  and satisfy in full any such  Lessor Lien (by bonding or  otherwise);
provided, that Owner Participant may contest any such Lessor Lien by a Permitted
Contest.

                  (e)  Successor  Owner  Trustee.  So  long as (i) no  Event  of
Default shall have occurred and be continuing, (ii) NACC has not been removed as
Operator for cause pursuant to the Services Agreement and (iii) no NACC Event of
Default  (as  defined  under  the  Services   Agreement)  has  occurred  and  is
continuing,  the Owner  Participant  shall not  appoint  or cause or allow to be
appointed  a successor  to any Owner  Trustee or the Power  Contract  Trustee as
applicable,  or an additional or separate  trustee under the Trust  Agreement or
the Power Contract  Trust  Agreement,  as  applicable,  without (i) giving prior
written  notice of such  appointment  (including  notification  of the principal
place of business of each such  successor,  additional  or separate  trustee) to
NACC (provided that NACC shall be entitled to quiet  enjoyment under Section 9.4
of this  Participation  Agreement and Section 6 of the Lease) and (ii) obtaining
the prior  written  consent of NACC (which  consent  shall not  unreasonably  be
withheld).  If such consent is given, the Owner Participant shall cause any such
successor, additional or separate trustee, simultaneously with its assumption of
duties in such capacity,  to take all actions  reasonably  necessary in order to
establish,  preserve,  protect and perfect its interest in and to the  Facility,
the Site,  the Easement  Site,  the Leasehold  Estate,  the Trust Estate and the
Lessor's Contract Rights and its rights under this  Participation  Agreement and
the other Operative Documents, subject only to Permitted Liens.

                  (f)  Additional  Covenants of Trust Company and Owner Trustee.
The Trust Company, in its individual capacity, covenants and agrees with respect
to  Sections  6.4(f)(i)  and (ii),  and each of the Owner  Trustee and the Power
Contract Trustee covenant and agree with respect to Sections 6.4(f)(i) and (iii)
that:

                  (i) Lessor Liens Attributable to Trust Company,  Owner Trustee
         or Power Contract Trustee.  Trust Company covenants and agrees with and
         for the benefit of NACC, HCNA and Owner  Participant that Trust Company
         will not  directly or  indirectly  create,  incur,  assume or suffer to
         exist any  Lessor  Liens  attributable  to it,  Owner  Trustee or Power
         Contract  Trustee,  and Trust  Company  agrees that it will, at its own
         cost  and  expense,  take  such  action  as may be  necessary  to  duly
         discharge and satisfy in full any such Lessor Liens arising as a result
         of any claims or liability of Trust Company in its individual capacity.

                  (ii)  Change of Chief  Place of  Business.  The Trust  Company
         shall give  notice to NACC,  HCNA and the Owner  Participant,  promptly
         after  any  change  in its  name,  chief  place  of  business  or chief
         executive  office,  or the  office  where the  records  concerning  the
         accounts,  contract  rights  or  general  intangibles  relating  to the
         transactions contemplated hereby are kept.



                                       59

<PAGE>



                  (iii) Notice of  Transfer.  So long as (i) no Event of Default
has  occurred or is  continuing,  (ii) NACC has not been removed as Operator for
cause pursuant to the Services  Agreement and (iii) no NACC Event of Default (as
defined in the Services  Agreement)  has occurred and is  continuing,  except as
otherwise expressly  provided,  the Owner Trustee and the Power Contract Trustee
shall not transfer any of the estates,  properties,  rights,  powers,  duties or
trusts of the Owner Trustee or the Power Contract Trustee, as applicable, to any
successor  trustee or to any  additional  or  separate  trustee  under the Trust
Agreement or the Power Contract Trust Agreement,  as applicable,  without giving
prior  written  notice of such  transfer  to NACC in  accordance  with the Trust
Agreement or the Power Contract Trust Agreement, as applicable.

                  (g) Regulation.  None of Owner  Participant,  Owner Trustee or
Power  Contract  Trustee (i) is or will become  solely as a result of activities
unrelated to Owner  Participant's,  Owner Trustee's or Power Contract  Trustee's
participation in the transactions  contemplated by the Lease Financing Documents
(A) "a person  primarily  engaged in the  generation  or sale of electric  power
(other than electric  power solely from  cogeneration  facilities or small power
production  facilities)"  within the meaning of Section 201 of PURPA,  16 U.S.C.
796(18)(B), or (B) an electric utility, electric utility holding company, or any
combination  thereof, or a subsidiary of an electric utility or electric utility
holding  company  within the meaning of 18 C.F.R.  ss.  292.206(b) (or successor
regulations)  or  a  "public  utility  company",  a  "holding  company",   or  a
"subsidiary company" or an "affiliate" of a "holding company" within the meaning
of Section  2(a) of PUHCA,  or (ii) will take any action  (other  than an action
required by Applicable Law or the Lease Financing  Documents)  which would cause
the revocation of the status of the Facility as a "qualifying  facility"  within
the meaning of Title 18 C.F.R., Part 292, Subpart B (or successor  regulations).
Subject to, and except as otherwise  provided in, Section 13(f) of the Lease, if
Owner Participant, Owner Trustee or Power Contract Trustee shall become a Person
referred to in the preceding sentence, Owner Participant, Owner Trustee or Power
Contract Trustee shall notify NACC immediately  after Owner  Participant,  Owner
Trustee or Power Contract  Trustee obtains actual knowledge of such fact and, to
the extent caused by a breach of Owner  Participant's,  Owner Trustee's or Power
Contract  Trustee's  obligations under this Section 6.4(g),  Owner  Participant,
Owner Trustee or Power Contract  Trustee shall promptly  either take such action
as may be necessary in order to cease to be such a Person or shall  transfer its
interest  in the  Trust  Estate  to an  entity  that  is not  such a  Person  in
accordance with Section 6.4(a).  Owner Trustee and Power Contract  Trustee shall
comply with Section 9(a) of the Trust  Agreement  and the Power  Contract  Trust
Agreement, respectively.

                  (h)  Cooperation.  So  long as (i) no  Event  of  Default  has
occurred  and is  continuing,  (ii) NACC has not been  removed as  Operator  for
cause, or (iii) no NACC Event of Default (as defined in the Services  Agreement)
has occurred and is continuing, upon the request of NACC, Owner Participant, the
Owner  Trustee and the Power  Contract  Trustee  shall,  at the expense of NACC,
reasonably  cooperate with NACC in obtaining the valid and effective issuance or
transfer or amendment, as the case may be, of all approvals,  notices,  filings,
consents,  waivers,   exemptions,   variances,   franchises,   orders,  permits,
authorizations,  certificates,  licenses, or other actions required to be taken,
given,  made,  or  obtained,  as the  case  may be,  by,  from,  to or with  any
applicable Authority, necessary or reasonably desirable for the


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ownership,  operation and  possession of the Complex by NACC or any  transferee,
lessee or assignee thereof during the Site Lease Term.

                  Section 6.5 Special Termination Event. (i) If at any time NACC
or HCNA  proposes  a  Special  Termination  Event  and  Owner  Trustee  or Owner
Participant,  as  applicable,  for  whatever  reason,  does not  consent to such
Special  Termination  Event as proposed by NACC or HCNA, as applicable  (or does
not consent to the Person,  if any,  designated  by NACC or HCNA to purchase the
Undivided  Interest in the  Facility  from the Other Owner  Trustee if the Other
Owner  Participant  or Other Owner  Trustee  does not  consent to such  proposed
Special  Termination  Event),  within  thirty  (30) days of receipt of NACC's or
HCNA's written  request for such request  (describing  such Special  Termination
Event in  reasonable  detail),  then if the Other Owner  Participant  shall have
consented to such  Special  Termination  Event and such Person,  the Other Owner
Participant  shall have the right,  upon notice given within thirty (30) days of
NACC or HCNA having notified the Other Owner  Participant that the Owner Trustee
or the Owner  Participant,  as applicable,  has withheld consent to such Special
Termination  Event,  to purchase  the interest of the Owner  Participant  in the
Trust  Estate  on a date  occurring  not less than 30 days and not more than 180
days after  receipt by the Other  Owner  Participant  of the notice from NACC or
HCNA specifying the applicable date for a price equal to the Special Termination
Payment Price. If the Other Owner  Participant  does not elect to purchase Owner
Participant's  Interest in the Trustee  Estate within such 30-day  period,  then
NACC or HCNA  shall  have the  right,  but only upon or in  connection  with the
consummation  of the transaction  that is the basis for the Special  Termination
Event,  to  purchase  (or to cause a  designated  Person to  purchase)  Lessor's
Undivided  Interest in the Facility,  on an "as is, where is" basis, upon notice
given within 60 days  following  the end of the 30-day period in which the Other
Owner  Participant was permitted to give notice of its election to purchase.  If
NACC or HCNA gives notice of its election to purchase the Undivided  Interest in
the Facility pursuant to the preceding sentence, the Special Termination Payment
Date shall be the date  specified  in such notice which shall be the date of the
closing of the Special  Termination Event transaction and in no event later than
180 days  after  the date of such  notice.  The  purchase  price  (the  "Special
Termination  Payment Price") for Lessor's Undivided Interest in the Facility (or
for the Owner  Participant's  interest in the Trust  Estate)  shall be an amount
equal  to the  greater  of (1)  the  Stipulated  Loss  Value  as of the  Special
Termination  Payment  Date (or if such  date is not a  Determination  Date,  the
Determination  immediately  preceding such date), plus (x) if such date is not a
Determination  Date,  interest  at the  Discount  Rate  from and  including  the
immediately  preceding   Determination  Date  to  (but  excluding)  the  Special
Termination  Payment  Date and (y) any  Break  Costs of Owner  Participant  (the
computation of such Break Costs in accordance with the definition  thereof being
set forth and certified in an Officer's  Certificate of Owner Participant),  and
(2) the Fair  Market  Sales  Value,  determined  as of the  Special  Termination
Payment Date.

                  (ii) On the Special  Termination Payment Date, the Other Owner
Participant shall pay to Owner Participant,  or NACC or HCNA (or such designated
Person)  shall pay to Owner  Trustee,  as  applicable,  the Special  Termination
Payment Price in immediately available funds.



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                  In  addition,  NACC shall pay to Owner  Trustee the  following
amounts on the Special Termination Payment Date:

                  (1)  any unpaid  Basic Rent due prior to (but not on or after)
         the Special Termination Payment Date;

                  (2)  all documented  out-of-pocket  costs and expenses payable
         by Owner  Participant or the Other Owner Participant as a result of the
         Special Termination Event; and

                  (3)  any due and unpaid Supplemental Rent and any other amount
         due and payable on, or relating to, the  obligations of Lessee to Owner
         Trustee or Owner Participant under any of the Operative  Documents that
         remains unpaid on the Special Termination Payment Date.

Upon payment of the  Stipulated  Loss Value or the Special  Termination  Payment
Price,  as  applicable,  and  all  other  amounts  specified  above,  (x)  Owner
Participant  shall  Transfer all of its right,  title and interest in and to the
Trust Estate to the Other Owner Participant, or (y) Owner Trustee shall Transfer
all of its right,  title and  interest in and to the  Undivided  Interest in the
Facility on an "as is, where is" basis free and clear of Lessor  Liens,  to NACC
or HCNA (or such other Person as may be designated by them), as applicable,  and
Owner Trustee or Owner Participant, as applicable, shall execute and deliver one
or more bills of sale and such other documents evidencing such Transfer as shall
be  reasonably  requested  or required to effect  such  Transfer.  Upon any such
Transfer  by Owner  Trustee  to NACC or HCNA,  the  Lease  Term  and,  except as
expressly  otherwise  provided  in this  Participation  Agreement  or the  other
Operative  Documents,  the obligations of NACC and HCNA under this Participation
Agreement and the other Operative Documents to Owner Participant shall terminate
and Owner  Participant  shall  promptly  surrender  any  Letter of Credit to the
issuer thereof for cancellation.


                                   ARTICLE VII

                                 INDEMNIFICATION

                  Section  7.1  General  Indemnity.  Whether  or not  any of the
transactions contemplated hereby are consummated, NACC shall (except as provided
in  Section  7.2 and  except to the  extent  that any of the  items  hereinafter
described are payable by Owner Trustee as part of Transaction  Costs)  indemnify
and hold  harmless each  Indemnitee  (on an After-Tax  Basis) from,  any and all
liabilities,  obligations, losses, damages, penalties, claims (including but not
limited to Environmental  Claims),  actions,  suits, costs,  expenses (including
legal and  consultants'  fees) and  disbursements  of whatsoever kind and nature
(herein   collectively   referred  to  as  "Expenses"  and  individually  as  an
"Expense"), imposed on, incurred by or asserted against such Indemnitee (whether
because of an action or omission by such  Indemnitee or otherwise and whether or
not  otherwise  indemnified),  in any way  relating to or arising out of (a) the
Facility,  the  Site,  the  Easement  Site,  the  Service  Facilities,  the Host
Facilities, the Leasehold Estate, or


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any  parts  thereof  or the  Undivided  Interests  therein,  (b)  the  Operative
Documents,  the Other  Operative  Documents or any of them,  or the execution or
delivery  thereof,  or the  performance,  enforcement  or  amendment  thereof or
payments made pursuant thereto or any other  transactions  contemplated  thereby
and  (c)  the  manufacture,   construction,  financing,  refinancing,  purchase,
acceptance, rejection, ownership, warranty, acquisition,  delivery, nondelivery,
insuring,  lease, sublease,  preparation,  installation,  storage,  maintenance,
repair, alteration,  modification,  restoration,  refurbishing,  transportation,
transfer of title, abandonment,  possession, rental, use, operation,  condition,
sale,  return,  importation,  exportation or other application or disposition of
all or any part of the  Facility,  the Site,  the  Easement  Site,  the  Service
Facilities,  the Host Facilities, the Leasehold Estate, any parts thereof or the
Undivided  Interest therein,  as applicable,  including  without  limitation (i)
claims or  penalties  arising  from any  violation  of law (to the  extent  such
indemnity is permitted by Applicable  Law in the case of any violation of law by
such  Indemnitee)  or strict  liability  in tort or from the  active or  passive
negligence of such Indemnitee,  (ii) loss of or damage to any property,  natural
resources  or the  environment  (including,  without  limitation,  to the extent
imposed on,  incurred by or  asserted  against  such  Indemnitee,  all  Expenses
associated with remediation,  response,  removal,  corrective  action,  cleanup,
treatment,  compliance,  restoration,  abatement,  encapsulation,   containment,
revegetation,   monitoring,  sampling,   investigation,   assessment,  financial
assurance,  natural  resource  damages,  the  protection of wildlife and aquatic
species and vegetation, the interference with or contamination of any wetland or
body of water (whether surface or subsurface) or aquifer, and any other relevant
mitigative  action  under  any  Environmental  Law) or death of or injury to any
Person, or the violation of or non-compliance  with any Environmental Law, (iii)
any Expenses in any way resulting from or relating to the actual,  threatened or
alleged existence or presence of any Hazardous  Material at, in, on or under the
Facility,  the  Site,  the  Easement  Site,  the  Service  Facilities,  the Host
Facilities,  the Leasehold Estate, any parts thereof, or the Undivided Interests
therein,  or the  transport of any  Hazardous  Material or the actual or alleged
Release of any Hazardous  Material into the  environment  (including  air, water
vapor,  surface water,  groundwater,  and land (whether surface or subsurface)),
(iv) latent or other defects, whether or not discoverable, and (v) any claim for
patent,  trademark  or  copyright  infringement.  Upon  payment  in  full of any
indemnity  pursuant to this Section 7.1 and all other  amounts then owing,  NACC
shall be  subrogated  to any right of such  Indemnitee  in respect of the matter
against  which such  indemnity  has been paid (other  than  rights to  insurance
proceeds  pursuant  to  policies  maintained  by  the  Owner  Trustee  or  Owner
Participant for their own account pursuant to Section 9(g) of the Lease) and (d)
NACC's or HCNA's  breach or failure  to comply  with its  obligations  under the
Operative Documents to which it is a party.

                  Section 7.2 Exceptions. The indemnity set forth in Section 7.1
with regard to any particular Indemnitee shall not extend to (a) any Expense (i)
to the extent resulting from the gross negligence or willful  misconduct of such
Indemnitee  or  its  respective  Affiliates,  directors,  officers,  successors,
assigns,  servants,  agents or  employees,  (ii) to the extent  included  in the
Transaction  Costs  payable  by  such  Indemnitee   pursuant  to  the  Operative
Documents,  (iii)  resulting  from the breach by such  Indemnitee  of any of its
material  agreements,  representations,  warranties  or  covenants in any of the
Operative Documents, (iv) to the extent resulting from acts or events that occur
after the surrender of  possession of the Facility by the Lessee,  except to the
extent that the  Expenses  arise as a result of a Default or an Event of Default
occurring prior to


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such  surrender  and,  with respect to any  Expenses  relating in any way to any
Environmental  Claim,  Environmental  Law or Hazardous  Material,  except to the
extent such Expenses  arise out of an event or condition  that occurred or arose
prior to such surrender of possession, regardless of when discovered, and to the
extent such  Expenses are not  attributable  to  conditions  arising  after such
surrender of possession,  (v) other than pursuant to Section 12, 13, 18 or 21 of
the  Lease,  Section  6.5 of this  Participation  Agreement  or an  exercise  of
remedies  under  the  Lease,  to  the  extent  resulting  from  a  voluntary  or
involuntary sale, transfer,  assignment or other disposition by Owner Trustee of
all or any part of the Facility or by any  Indemnitee of all or any part of such
Indemnitee's  right,  title and interest in and to the Facility or any Operative
Document,  (vi)  relating to salaries  or general  overhead of such  Indemnitee,
(vii) to the extent resulting from any OP Regulatory Event of Loss, or (viii) to
the extent  resulting from any obligation or liability  assumed in any Operative
Document  by such  Indemnitee  or (b) any Tax  (except  to the  extent  that any
indemnity under Section 7.1 is required to be reimbursed on an After-Tax  Basis)
or loss of tax benefits.

                  Notwithstanding   the   provisions   of  the  Power   Contract
Assignment,  HCNA and NACC expressly agree and acknowledge  that for purposes of
this  Article  VII none of the Power  Contract  Trustee,  Owner  Trustee,  Trust
Company or Owner  Participant  shall be deemed to have assumed any  liability or
obligation,  or undertaken to perform any agreement or covenant, under the Power
Purchase  Agreements  with  respect  to the period  prior to the  earlier of (x)
termination  of the  Sub-Assignment  Term  (as  defined  in the  Power  Contract
Assignment) and (y) the giving of the notice by the Power Contract Trustee under
Section 3(b) of the Power Contract Assignment.

                  Section 7.3 Procedures. (a) If any Indemnitee has knowledge of
any action, suit,  proceeding or claim indemnified against under Section 7.1, it
shall give prompt written notice thereof to NACC;  provided,  however,  that the
failure  of any  Indemnitee  to give such  notice  shall not affect its right to
indemnity.  If NACC has  knowledge  of any  action,  suit,  proceeding  or claim
indemnified  against under Section 7.1, it shall give prompt  written  notice to
(i) in the case of notices  relating to the Owner  Participant or any Affiliate,
officer,  director,  servant or agent of either of such  Indemnitees,  the Owner
Participant,  or (ii) in the case of notices relating to the Owner Trustee,  the
Power  Contract  Trustee  and its trust  estate,  the Trust  Estate or the Trust
Company or any Affiliate,  officer, director, servant or agent of Trust Company,
the Owner Trustee.

                  (b)  So long as no Event of Default shall have occurred and be
continuing,  NACC (the "Assuming Person") may, at its expense, resist and assume
the defense of any action,  suit or proceeding in respect of which NACC would be
required to indemnify  hereunder,  or cause the same to be resisted and defended
(to the extent the same involve  solely a claim for Expenses,  or for claims for
other than  Expenses,  to the extent the claim for  Expenses can be severed from
other claims and NACC obtains such  severance) by counsel for the insurer of the
liability or by counsel  designated  by the Assuming  Person and approved by the
Indemnitee (which approval shall not be unreasonably  withheld);  provided, that
such Indemnitee  shall  cooperate with the Assuming Person by providing,  at the
expense of the Assuming Person,  such witnesses,  documents and other assistance
as the Assuming Person may reasonably request. If


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such Indemnitee  desires to participate in the defense of any such action,  suit
or  proceeding  (which the Assuming  Person is so resisting  and defending or is
causing so to be resisted and defended)  through its own counsel,  it may do so,
at its own expense;  provided,  however,  that if the Owner  Participant  or the
Owner Trustee, as applicable,  on behalf of the Indemnitee shall have reasonably
concluded that there may be legal defenses available to such Indemnitee that are
different from or additional to those available to NACC or that might reasonably
result in a conflict  between NACC and such  Indemnitee,  such Indemnitee  shall
have the right to select  separate  counsel to assert  such legal  defenses  and
otherwise  to  participate  in the  defense  of such  action  on  behalf of such
Indemnitee  at the expense of the Assuming  Person.  Upon receipt of notice from
the  Assuming  Person  to  the  Owner  Participant  or  the  Owner  Trustee,  as
applicable,  on behalf  of such  Indemnitee  of its  election  so to assume  the
defense of such action and approval by the counsel of  Indemnitee,  the Assuming
Person will not be liable to such Indemnitee  under Section 7.1 for any legal or
other expenses  subsequently  incurred by such Indemnitee in connection with the
defense thereof unless the Indemnitee  shall have employed  separate  counsel in
connection  with the assertion of legal defenses in accordance  with the proviso
to the  immediately  preceding  sentence;  provided,  that in no event shall the
Assuming  Person be liable for the fees and  expenses of more than one  separate
counsel for the Owner Participant or any of its Affiliates, officers, directors,
servants  and agents and another  separate  counsel for the Owner  Trustee,  the
Power Contract Trustee,  the Power Contract  Trustee's estate, the Trust Estate,
the Trust Company, or any of their Affiliates, officers, directors, servants and
agents in any action, suit, proceeding or claim relating to common issues in any
one jurisdiction and provided, further, that the Owner Participant agrees to use
reasonable  good faith efforts to cooperate with the Other Owner  Participant in
any such legal  defenses and to endeavor to employ a single common  counsel with
the Owner  Participant  without  prejudice to its rights to separate counsel set
forth in this  Section  7.3. It shall be a condition  to NACC's  exercise of the
election to assume the defense of any such action: (i) that such action does not
involve any risk of the imposition of any criminal  liability on any Indemnitee,
or any  material  risk of sale,  forfeiture  or loss of, or creation of any Lien
(other than a Permitted Lien), on the Facility, Undivided Interest or Site, (ii)
that NACC shall provide to the Indemnitee an assumption and  acknowledgement  of
NACC's  liability under this indemnity with respect to the matters so contested,
and  (iii)  that  there  shall at such  time  exist no  Event  of  Default.  Any
Indemnitee may settle or compromise any action,  suit,  proceeding or claim with
respect  to such  Indemnitee  in respect  of which  NACC  would be  required  to
indemnify it hereunder. Notwithstanding the foregoing, (i) in the event that any
such action,  suit,  proceeding or claim also involves  matters other than those
for which  indemnification is being sought, NACC shall bear only such portion of
such  fees and  expenses  as shall be  attributable  to the  matters  for  which
indemnification is being sought, and (ii) NACC shall not be liable hereunder for
any  settlement  or  compromise  of any  Expense  of  such  Indemnitee  if  NACC
theretofore  has  exercised,  or notified  the  Indemnitee  of its  intention to
exercise,  its right to resist  and assume the  defense  of such  action,  suit,
proceeding  or claim  pursuant  to this  Section 7.3 and if such  settlement  or
compromise is effected without the NACC's written  consent,  which consent shall
not be unreasonably  withheld or delayed.  Any Indemnitee  hereunder may proceed
directly  against  NACC under this  Article VII without  first  resorting to any
other available  rights of  indemnification.  All indemnities  contained in this
Article  VII  shall  continue  in full  force  and  effect  notwithstanding  the
expiration or other  termination  of any Operative  Document,  or any assignment
hereof or thereof, and are expressly


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made for the benefit of, and shall be enforceable  by, each  Indemnitee.  NACC's
obligations  under  this  Article  VII  shall  be  that  of  a  primary  obligor
irrespective of whether an Indemnitee  shall also be indemnified with respect to
the same matter under this Agreement or any other agreement by any other Person.
The  indemnities and assumptions of liabilities set forth in this Article VII do
not  guarantee  a  residual  value  of the  Facility,  any part  thereof  or the
Undivided Interest therein.

                  (c) NACC  covenants  to pay all amounts due under  Section 7.1
within 30 days of the date on which an Indemnitee provides NACC with information
sufficient  to  calculate  the amount due and payable  under  Section 7.1 and to
identify  the nature of the Expense  against  which  indemnity  is sought.  With
respect to any amount that NACC is requested by an  Indemnitee  to pay by reason
of Section  7.1,  the  Indemnitee  shall,  if  requested  by NACC,  submit  such
additional  information  to NACC,  as NACC may  reasonably  request  properly to
substantiate the requested payment.

                  (d) If an Indemnitee  shall obtain a refund of all or any part
of Expenses  payment or indemnity for which shall have been made by the Assuming
Person  pursuant to Section  7.1,  such  Indemnitee  shall  promptly  pay to the
Assuming  Person the  amount of such  refund  including  any  interest  received
(unless a Default or an Event of Default shall have occurred and be  continuing,
in which  case such  payment  need not be made  until  such  Default or Event of
Default shall have been cured or waived).

                  Section  7.4  General  Tax  Indemnity.  (a)  Payment of Taxes.
Except as provided in Section 7.4(b),  Lessee agrees to pay free of withholdings
attributable  to U.S.  Federal,  state  and local  income  taxes  (provided  the
Indemnitee  has  provided  Lessee with a  California  Form 590 or a  withholding
certificate  issued  by the  California  Franchise  Tax Board in the case of any
payment that is otherwise  subject to  California  income tax  withholding)  and
Taxes  indemnified  in this  Section 7.4,  and to assume  liability  for, and to
indemnify and hold harmless,  each  Indemnitee (on an After-Tax  Basis) from and
against  any  and  all  taxes,  impositions,   fees,  levies,  imposts,  duties,
withholding,  assessments,  or other charges of any nature whatsoever  (together
with any  related  interest,  penalties,  fines or  additions  to tax)  (all the
foregoing being herein  collectively  called "Taxes" or,  separately,  a "Tax"),
including,  without limitation,  license, filing,  recording,  documentation and
registration  fees  and  sales,  use,  income,   franchise,   receipt,   rental,
value-added,  stamp,  transfer,  leasing,  property,  excise,  or license taxes,
imposed on or with  respect to or borne by or asserted  against any  Indemnitee,
the Lessee, the Facility, the Site, the Service Facilities, the Host Facilities,
the Leasehold Estate, or any parts thereof or the Undivided  Interests  therein,
or upon any Operative Document, or any of them or interest therein, or otherwise
by any U.S. Federal taxing authority or any taxing authority in any state or any
locality  where the  Facility or any portion  thereof or the Site or any portion
thereof is used or located upon arising out of, in  connection  with or relating
to (i) the conduct of the business or affairs of the Lessee,  the Facility,  the
Site, the Service Facilities,  the Host Facilities, the Leasehold Estate, or any
parts  thereof  or the  Undivided  Interests  therein,  (ii)  the  construction,
acquisition,  acceptance, delivery, nondelivery, possession, return, subleasing,
modification,  transfer of title, rental,  purchase,  sale, leasing,  ownership,
maintenance,   repair,  redelivery,   insuring,  use,  operation,  financing  or
refinancing or mortgaging of all or any part


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of the Facility,  the Site, the Service  Facilities,  the Host  Facilities,  the
Leasehold Estate, or any parts thereof or the Undivided Interests therein, (iii)
the manufacture, design, purchase, acceptance,  rejection, delivery or condition
of or improvement to the Facility,  the Site, the Service  Facilities,  the Host
Facilities,  the  Leasehold  Estate,  or any  parts  thereof  or  the  Undivided
Interests therein, (iv) the rental payments (including,  without limitation, all
Interim Rent, Basic Rent, and Supplemental  Rent),  receipts or earnings arising
from the  Facility or any portion  thereof or any  interest  therein,  Undivided
Interest,  the Site or any  portion  thereof  or  interest  therein  or  payable
pursuant to the Lease or in each case, the applications or dispositions thereof,
or any other  payment  or right to receive  payment  pursuant  to the  Operative
Documents,  (v) the Operative Documents or any waivers or covenants with respect
thereto  or  any  Indemnitee's  interest  in  the  Operative  Documents,  or the
execution,  amendment,  supplement,  issuance,  delivery or  enforcement  of the
Operative  Documents or (vi) otherwise with respect to or in connection with the
transactions contemplated by the Operative Documents.

                  (b) Exclusions  from General Tax Liability.  The provisions of
Section  7.4(a)  shall not apply to, and Lessee  shall have no  liability to any
Indemnitee  under Section 7.4(a) with respect to: (i) Taxes (other than, in each
case,  Taxes  that are or are in the  nature  of  sales,  use,  stamp,  license,
transfer,  rental,  property or similar  taxes)  based on,  with  respect to, or
measured  by, net income  (including,  but not limited to,  capital  gain Taxes,
minimum and alternative  minimum Taxes,  accumulated  earnings  Taxes,  personal
holding  company Taxes,  excess profits Taxes and Taxes measured by items of tax
preference);  (ii) Taxes,  including,  without  limitation,  sales and  transfer
Taxes,  that result from (A) any  voluntary  transfer  by an  Indemnitee  of any
interest in the Trust  Estate,  Facility,  Undivided  Interest,  the Site or any
interest in any other  Indemnitee  or any portion of any of the foregoing or any
interest arising out of the Operative  Documents unless such transfer shall have
occurred in  connection  with,  or as a result of, an Event of Default or unless
such  transfer  shall be  pursuant  to the  provisions  of the Lease,  including
without  limitation,  the exercise by the Lessee of any of its purchase  options
pursuant to the Lease or (B) any involuntary transfer by an Indemnitee of any of
the foregoing interests described in clause (A) resulting from any bankruptcy or
other  proceeding  for the relief of debtors in which the Indemnitee is a debtor
or any foreclosure by a creditor of the  Indemnitee,  unless such transfer shall
have  occurred in connection  with or as a result of an Event of Default;  (iii)
Taxes  imposed  by any  jurisdiction,  other  than a  jurisdiction  in which the
Facility or any portion  thereof or the Site or any portion  thereof or interest
therein  is used or  located,  as a result of (A) a situs of  organization  or a
place of  business  (other than a situs of  organization  or a place of business
arising,  or deemed to arise,  from  acquiring the Facility or entering into the
transactions  contemplated by the Operative  Documents) of the Indemnitee or (B)
an  Indemnitee's  engaging in activities in such  jurisdiction  unrelated to the
transactions  contemplated by the Operative Documents;  (iv) Taxes imposed on an
Indemnitee  (A) that result from the willful  misconduct or gross  negligence of
such  Indemnitee  (B) that result from the failure of an  Indemnitee to file tax
returns in a  procedurally  proper  manner  and on a timely  basis or to claim a
deduction  or credit (C) that would not have been imposed but for the failure of
an  Indemnitee  to  comply  with  certification,   reporting  or  other  similar
requirements  of the  jurisdiction  imposing such Tax if, in the case of each of
(B) and (C),  filing or compliance is (I) required by U.S.  Federal,  state,  or
local law or (II) otherwise  requested by the Lessee and required by application
of law as a  precondition  to any exemption  from, or reduction of, Tax,  unless
either such filing


                                       67

<PAGE>



or compliance, as the case may be, will cause an Indemnitee adverse consequences
determined  in its sole  discretion  exercised  in good faith or such failure to
file or of  compliance,  as the case may be, results from a failure of Lessee to
satisfy its obligations  under Section 7.4(c) hereof or (D) that result directly
from a material  insufficiency or material  inaccuracy of information or records
required  to be  supplied  by the  Indemnitee  hereunder;  (v)  Taxes  that  are
attributable  to any  period  beginning  or  circumstance  occurring  after  the
expiration or earlier termination of the Lease and, if applicable, the return of
the  Facility to the Owner  Trustee in  accordance  with the terms of the Lease,
unless  such  Taxes  relate to acts,  events or  matters  arising  prior to such
expiration or termination,  as applicable,  return or imposed on or with respect
to any payments due under the Operative  Documents  after such time;  (vi) Taxes
arising  as a direct  result  of an OP  Regulatory  Event of Loss;  (vii)  Taxes
imposed as a result of the Owner  Trust not being  treated as a "grantor  trust"
subject to sections  671 through  679 of the Code (or any  successor  provisions
thereto) for income tax  purposes;  (viii) Taxes  imposed on an  Indemnitee as a
result of a breach of a  representation  by such  Indemnitee  under an Operative
Document;  (ix) Taxes  arising in  connection  with  Lessor  Liens;  (x) any Tax
enacted by its terms or  legislative  history as a substitute  for any Tax as to
which Lessee is not liable hereunder pursuant to any exception described in this
Section 7.4(b);  (xi) Taxes imposed on or payable by a transferee or assignee of
an original Indemnitee to the extent of the excess of such Taxes over the amount
of such Taxes that would have been  imposed had there not been a transfer by the
relevant original  Indemnitee  (provided,  that the exclusion shall not apply to
any taxes that result from any transfer in  connection  with, or as a result of,
an Event of  Default  or to any  amount  required  to be made as  payment  on an
After-Tax Basis);  (xii) Taxes that are included in the initial tax basis of the
Facility;  (xiii)  Taxes  imposed on, based on, or measured by any fees or other
compensation  that the Owner  Trustee  receives for acting as trustee  under the
Trust Agreement;  and (xiv) Taxes for which the Lessee is obligated to indemnify
Owner Participant under the Tax Indemnity Agreement.

                  (c) Reports. If any report, return or statement is required to
be filed with  respect to any Tax  imposed on an  Indemnitee  that is subject to
indemnification under this Section 7.4, the Lessee shall timely prepare and file
the same (except for any such report,  return or statement with respect to which
an Indemnitee has notified the Lessee that an Indemnitee  intends to prepare and
file);  provided,  that Lessee shall have no obligation to file any such report,
return or statement if such Indemnitee,  after Lessee's written request therefor
within a  reasonable  time prior to the due date,  shall have  failed to furnish
Lessee  with such  information  as is  reasonably  available  to Lessor  and not
otherwise  available to Lessee and is  necessary  for the filing of such report,
return or  statement,  or such  return  would or should  have been filed by such
Indemnitee even if it had not entered into the transactions  contemplated by the
Operative Documents.  If requested by the Lessee in writing, an Indemnitee shall
furnish  the  Lessee  at  Lessee's  expense  with  such  information  reasonably
necessary  to prepare and file such returns as is  reasonably  available to such
Indemnitee  and not within the control of the Lessee.  The Lessee  shall  either
timely file such  report,  return or  statement  and send a copy of such report,
return or statement to an Indemnitee,  or, where not so permitted to file, shall
timely notify an Indemnitee of such requirement and, if practicable, prepare and
deliver such report,  return or statement to an  Indemnitee  within a reasonable
period of time and in all events at least five  business  days prior to the time
such  report,  return or statement  is required to be filed.  If the  Indemnitee
shall have


                                       68

<PAGE>



notified  Lessee of its  intention  to prepare  and file any  report,  return or
statement or in case of any report,  return or statement required to be filed by
the Indemnitee,  the Lessee, at its expense,  shall make available or provide to
the  Indemnitee  such  information  or records  within its control or  otherwise
reasonably  available  to Lessee and not within the  control of the  Indemnitee,
which  information or records are reasonably  necessary to prepare and file such
report, return or statement. The Lessee shall hold each Indemnitee harmless from
and against all liability  arising out of any insufficiency or inaccuracy of any
report, return or statement if such insufficiency or inaccuracy results from the
insufficiency or inaccuracy of information or records required to be supplied by
the Lessee.

                  (d)  Payments.  Any Tax  indemnified  hereunder  shall be paid
directly when due to the  applicable  taxing  jurisdiction  if direct payment is
permitted  or shall be  reimbursed  to an  Indemnitee  on demand if paid by such
Indemnitee.  Except as  otherwise  provided  in this  Section  7.4,  all amounts
payable to an  Indemnitee  under this Section 7.4 shall be paid  promptly and in
any event  within  thirty  (30) days  after  receipt  by the Lessee of a written
demand  therefor  (but not prior to two days  prior to the  payment of the Tax),
accompanied by a written  statement  describing in reasonable detail the Tax and
the  computation  of the amount  payable  (which amount  shall,  at the Lessee's
request, be verified by a nationally recognized "big six" independent accounting
firm selected by the Indemnitee  and reasonably  acceptable to the Lessee at the
Lessee's  expense).  Subject to  satisfactory  confidentiality  agreements,  the
Indemnitee  shall  provide  the  independent  accounting  firm such  information
(including  information  from such tax  returns  of the  Indemnitee)  reasonably
necessary to verify such computations.  Any information provided to such firm by
the Indemnitee shall be for its confidential use only and shall not be disclosed
to  the  Lessee  or  any  other   person.   The  parties  agree  that  the  sole
responsibility of the independent  accounting firm shall be to verify the amount
of any payment  hereunder  and that  matters  regarding  interpretation  of this
Agreement  or any  other  Operative  Document  is not  with in the  scope of the
independent accounting firm's responsibilities.

                  (e) Contests;  Refunds. (i) In the event a taxing jurisdiction
makes a claim with  respect to any Tax for which the Lessee may be liable  under
this  Section  7.4 (a "Tax  Claim"),  the  Lessee  may  contest,  or cause to be
contested,  such Tax Claim as set  forth  herein.  In the  event any  Indemnitee
receives  written  notice of a Tax  Claim or  potential  Tax  Claim  that may be
indemnifiable  under this Section 7.4, such Indemnitee shall promptly notify the
Lessee thereof.  Subject to the preconditions set forth herein, if within thirty
(30) days after its receipt of such notice the Lessee  shall  request in writing
that such Indemnitee  contest the imposition of such Taxes, then such Indemnitee
shall in good  faith  contest  (including,  without  limitation,  by  pursuit of
appeals),  and shall not settle  without the  Lessee's  consent,  the  validity,
applicability  or amount of such  Taxes by, at the  Indemnitee's  option  (after
consulting in good faith with the Lessee),  (A) resisting  payment thereof,  (B)
not paying the same except under  protest,  if protest  shall be  necessary  and
proper,  or (C) if payment shall be made, using  reasonable  efforts to obtain a
refund  thereof  or  credit  therefor  through  appropriate  administrative  and
judicial  proceedings.  Provided  (x)  title  to or  interest  in the  Undivided
Interest,  the  Facility,  the Site or any part  thereof is not  subjected  to a
material risk of loss or forfeiture  (unless the Lessee  provides a satisfactory
bond or makes other provisions satisfactory  (determined,  in each case, by each
Indemnitee in its sole discretion exercised in good faith) to each Indemnitee to
protect


                                       69

<PAGE>



its interest) (y) there is no risk of the imposition of criminal penalties on an
Indemnitee  and (z) the Tax Claim  does not  involve  matters  which (A)  extend
materially  beyond,  and are unrelated to, the transactions  contemplated by the
Operative Documents,  (B) cannot be resolved  independently of the Tax Claim and
(C) if determined adversely could be materially  detrimental to the interests of
the Indemnitee,  notwithstanding  indemnification  by the Lessee,  as reasonably
determined by the Indemnitee,  after consultation with Lessee,  then, subject to
the  paragraph  (iv) of this Section  7.4(e),  the Lessee may at its own expense
defend  against,  and contest  (including  any  appeals,  other than to the U.S.
Supreme  Court) the  imposition  of, or subject to the  paragraph  (iii) of this
Section 7.4(e), request such Indemnitee to contest (including any appeals, other
than to the U.S.  Supreme  Court) the  imposition  of, any Tax Claim and in such
event no  Indemnitee  shall be  entitled to settle,  compromise  or pay such Tax
Claim so long as such contest is being prosecuted diligently and in good faith.

                  (ii) Any  Indemnitee  that  settles a  contest  of a Tax Claim
required to be contested  under this Section  7.4(e)  without the consent of the
Lessee shall waive its right to indemnification with respect thereto.

                  (iii) In no event shall any  Indemnitee be required to contest
the  imposition  of any Tax for which the Lessee may be  obligated  to indemnify
pursuant to this  Section 7.4 unless (A) the Lessee shall have agreed in writing
to pay and  shall pay to such  Indemnitee  on demand  all  reasonable  costs and
expenses that such  Indemnitee  incurs in connection  with  contesting  such Tax
Claim (including without limitation,  all costs, expenses,  reasonable legal and
accounting   fees   and   disbursements),   (B)  the   anticipated   amount   of
indemnification payments that might be payable with respect to all claims raised
in the same audit (together with the amount of all similar and logically related
claims that could be raised in any other audit of the  Indemnitee)  with respect
to the Undivided  Interest,  equals or exceeds $20,000,  (C) no Event of Default
shall have  occurred and be  continuing,  unless the Lessee shall have  provided
security that the Indemnitee determines in its sole discretion exercised in good
faith to be  satisfactory  with respect to Lessee's  obligation to indemnify the
Indemnitee  with  respect  to  such   imposition,   (D)  nationally   recognized
independent  tax counsel  selected by Lessee and reasonably  satisfactory to the
Indemnitee  shall have  furnished  to the  Indemnitee  an  opinion,  prepared at
Lessee's expense, setting forth in reasonable detail the factual and legal basis
for  the  contest,  and (E) if such  contest  shall  be  conducted  in a  manner
requiring  the payment of the Tax Claim,  the Lessee  shall have paid or made an
interest-free  advance on an After-Tax Basis the amount required. If the contest
described  above does not require the payment of a Tax Claim,  the provisions of
Section  7.4(a)  shall not apply to any Tax so long as it is being  contested in
accordance with the provisions of this Section 7.4(e).

                  (iv) The  Lessee  may (or at the  request  of the  Indemnitee,
shall)  contest,  at its own expense and subject to conditions  (A), (C) and (E)
set forth in paragraph (iii), the validity, applicability or amount of any Taxes
in its own name (if permitted by  applicable  laws and  regulations),  provided,
that the claim can be  segregated  procedurally  from Tax  claims  for which the
Lessee is not  obligated to indemnify  the  Indemnitee  and the  Indemnitee  has
reasonably  determined  that it does not have defenses  available to it that are
different from or in addition to those  available to the Lessee.  The Lessee may
also contest the validity, applicability or amount


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<PAGE>



of any Taxes in the name of an Indemnitee,  provided, that no such proceeding or
action relating to such contest in the name of an Indemnitee  shall be commenced
by the Lessee without the prior written  consent of such Indemnitee and any such
contest shall be conducted in good faith by and at the expense of the Lessee. If
the Lessee exercises its option or, at the Indemnitee's  request, is required to
pursue a contest in its own name or,  with the consent of an  Indemnitee  in the
name of such  Indemnitee,  each Indemnitee will cooperate in good faith with the
Lessee in the pursuit of such contest.  The  Indemnitee  shall have the right to
participate in any reasonable manner at its own expense and with its own counsel
in any proceeding conducted by the Lessee in accordance with this paragraph.

                  (v) Notwithstanding  the foregoing  provisions of this Section
7.4,  (a) an  Indemnitee,  in its sole  discretion  (by  written  notice  to the
Lessee),  may  unconditionally  waive its rights to the indemnities set forth in
this Section 7.4 with respect to any Tax Claim, and refrain from contesting such
Tax Claim,  in which event the Lessee shall have no liability to the  Indemnitee
hereunder  with  respect to such Tax Claim,  it being  understood  that any such
waiver shall be without  prejudice to the rights of the Indemnitee  with respect
to any other Tax Claim and (b) no  Indemnitee  shall be  required to contest any
claim if the subject  matter  thereof shall be of a continuing  nature and shall
have previously been decided  adversely  pursuant to Section 7.4(e) unless there
has been a change in law and the  Lessee  shall  have  delivered  an  opinion of
nationally recognized  independent tax counsel selected by Lessee and reasonably
satisfactory to the Indemnitee  prepared at Lessee's  expense that,  taking into
account such previous decision,  that it is more likely than not that such claim
can be resolved on a basis favorable to the Indemnitee.  Each Indemnitee and the
Lessee  shall  consult in good faith  with each other  concerning  each step and
decision regarding the conduct of such contest  controlled by either,  including
the forum in which the Tax Claim is most likely to be favorably resolved.

                  (vi) If any Indemnitee shall receive a refund of, or receive a
credit  for  (or  would  have  received  such  a  refund  or  credit  but  for a
counterclaim or other claim not  indemnified by the Lessee  hereunder (a "Deemed
Refund or Credit")),  all or any part of any Taxes paid,  reimbursed or advanced
by the Lessee,  then such Indemnitee  shall pay to the Lessee within thirty (30)
days of such  receipt  (or,  in the case of a Deemed  Refund or  Credit,  within
thirty (30) days of the Final  Determination of such claim),  an amount equal to
the lesser of (I) the amount of such refund or credit or Deemed Refund or Credit
plus or minus  any net tax  benefit  or cost  (taking  into  account  any  Taxes
incurred by such  Indemnitee  by reason of the receipt or accrual of such refund
or credit or Deemed Refund or Credit) realized by such Indemnitee as a result of
any payment by such Tax  Indemnitee  made pursuant to this  sentence  (including
this  clause  (I)) and (II) the  amount of such tax  payment,  reimbursement  or
advance by Lessee plus any other payment by the Lessee  pursuant to this Section
7.4 to such Indemnitee,  it being intended that such Tax Indemnitee shall retain
a net tax benefit pursuant to this Section 7.4(e) only if the Lessee shall first
have  been  reimbursed  for the  corresponding  tax  payment,  reimbursement  or
advance,  provided,  further, that, if at the time any such payment would be due
and payable,  an Event of Default  shall have  occurred and be  continuing,  the
Indemnitee shall hold the amount of such payment as security for the obligations
of Lessee to the Lessor under the Operative Documents, and at such time as there
shall not be continuing any such Event of Default,  shall pay such amount to the
Lessee. If, in addition to such refund or credit or Deemed Refund or


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<PAGE>



Credit,  as the case may be,  such  Indemnitee  shall  receive  (or  would  have
received  but for a  counterclaim  or other  claim  not  indemnified  by  Lessee
hereunder)  an amount  representing  interest  on the  amount of such  refund or
credit or Deemed Refund or Credit, as the case may be, such Indemnitee shall pay
to the  Lessee  within  thirty  (30) days of such  receipt  or, in the case of a
Deemed Refund or Credit,  within thirty (30) days of the Final  Determination of
such claim,  that portion of such interest that shall be fairly  attributable to
Taxes paid,  reimbursed  or advanced by the Lessee  prior to the receipt of such
refund or credit or Deemed Refund or Credit.  If it is later determined that the
Indemnitee was not entitled to such refund or credit or Deemed Refund or Credit,
the  portion  of such  refund  or credit  or  Deemed  Refund  or Credit  that is
disallowed,  reduced,  lost,  repaid, or recaptured will be treated as Taxes for
which the Lessee is obligated to Indemnify the Indemnitee  hereunder (subject to
the  exclusions set forth in clauses (ii) or (iv) of Section  7.4(b)).  A "Final
Determination"  with respect to this  Section  7.4(e) shall mean (i) a decision,
judgment,  decree or other order by any court of competent  jurisdiction,  which
decision,  judgment,  decree or other order has become final after all allowable
appeals by either party to the action have been exhausted or the time for filing
such  appeal  has  expired  or a final  administrative  determination  where  no
judicial appeal of that determination is available,  (ii) a closing agreement or
any other settlement agreement entered into in connection with an administrative
or judicial  proceeding and with the consent of the Lessee in  circumstances  in
which such consent is required  under Section 7.4 of this  Agreement,  (iii) the
expiration  of the  time  for  instituting  suit  with  respect  to the  claimed
deficiency,  or (iv) the  expiration  of the time for  instituting  a claim  for
refund,  or if such claim was filed,  the expiration of the time for instituting
suit with respect thereto.

                  (f) Tax Savings.  To the extent not already taken into account
in computing  After-Tax  Basis, any payment that the Lessee shall be required to
make  to  any   Indemnitee   with   respect  to  any  Tax  that  is  subject  to
indemnification  under this Section 7.4 shall reflect any current Tax savings of
such  Indemnitee  resulting by way of allocation or  apportionment,  deductions,
credits  or other  tax  benefits  attributable  to such  indemnified  Tax or the
circumstances thereof that are currently available to reduce any Taxes for which
the Lessee is not required to indemnify such Indemnitee pursuant to this Section
7.4.  If by reason of the  incurrence  of any Tax for  which the  Indemnitee  is
indemnified hereunder or any payment made to or for the account of an Indemnitee
by the Lessee pursuant to this Section 7.4, such Indemnitee at any time realizes
a reduction in any Taxes for which the Lessee is not required to indemnify  such
Indemnitee  pursuant to this Section 7.4, which reduction in Taxes was not taken
into  account in  computing  such payment by the Lessee to or for the account of
such Indemnitee, then such Indemnitee shall promptly pay to the Lessee an amount
equal to such reduction in Taxes,  plus the amount of any additional Tax savings
of such  Indemnitee  attributable  to any payment made by such Indemnitee to the
Lessee pursuant to this sentence;  provided,  however,  that an Indemnitee shall
not be  obligated  to make any payment  pursuant to this  Section  7.4(f) to the
extent that the amount of such payment  would exceed (x) the amount of all prior
payments by the Lessee to the Indemnitee and any Affiliate  thereof  pursuant to
this Section 7.4,  less (y) the amount of all prior  payments by the  Indemnitee
and any  Affiliate  thereof to the Lessee under this Section  7.4(f),  provided,
that,  if at the time any such  payment  would be due and  payable,  an Event of
Default shall have occurred and be  continuing,  the  Indemnitee  shall hold the
amount of such payment as security for the obligations of Lessee to the Lessor


                                       72

<PAGE>



under the Operative Documents, and at such time as there shall not be continuing
any such Event of Default,  shall pay such amount to the Lessee. Any such excess
described in clause (ii) of the immediately  preceding sentence shall be carried
forward and reduce the Lessee's  obligation to make  subsequent  payments to the
Indemnitee  and any  Affiliate  thereof  pursuant to this Section 7.4. The loss,
disallowance,  reduction, repayment or recapture of any Tax savings with respect
to which an Indemnitee has made a payment to Lessee hereunder or which was taken
into account in calculating  any indemnity  payment under this Section 7.4 shall
be  treated  as a Tax for  which the  Lessee  is  obligated  to  indemnify  such
Indemnitee  hereunder  without  regard to the  exclusions  provided  in  Section
7.4(b).

                  (g)  Reimbursements  by  Indemnitees  Generally.  If,  for any
reason,  the Lessee is required to make any  payment  with  respect to any Taxes
imposed on any Indemnitee,  which taxes are not the responsibility of the Lessee
under this Section 7.4, then such  Indemnitee  shall pay to the Lessee an amount
that equals the amount paid by the Lessee with respect to such Taxes.

                  Section 7.5 Survival. The provisions of this Article VII shall
survive the expiration or termination of this Participation Agreement, the Lease
and the other Operative Documents.


                                  ARTICLE VIII

                    LIMITATION OF LIABILITY OF OWNER TRUSTEE

                  It is expressly understood and agreed by and among the parties
hereto  that,  except as  otherwise  expressly  provided  herein or in the other
Operative  Documents,  (a) this Participation  Agreement and the other Operative
Documents (other than the Trust Agreement) to which Owner Trustee is a party are
executed by the Trust  Company,  not in its individual  capacity,  but solely as
Owner  Trustee  under  the  Trust  Agreement  in the  exercise  of the power and
authority  conferred  and  vested  in it as Owner  Trustee,  (b) each and  every
agreement,  covenant,  representation and warranty made by Owner Trustee in this
Participation  Agreement or any other Operative  Document to which it is a party
(except the Trust  Agreement) is made and intended not as a personal  agreement,
covenant,  representation  and warranty by Trust Company,  or for the purpose or
with the intention of binding Trust Company personally, but is made and intended
for the  purpose of binding  only the Trust  Estate,  (c) actions to be taken by
Owner Trustee pursuant to its obligations under this Participation  Agreement or
the  other  Operative  Documents  to  which  it is a  party  (except  the  Trust
Agreement)  may,  in  certain  circumstances  set  forth  herein or in the other
Operative  Documents to which it is a party, be taken by Owner Trustee only upon
specific authority of Owner Participant,  (d) nothing contained in the Operative
Documents  shall be  construed  as  creating  any  liability  on Trust  Company,
individually or personally,  or any incorporator or any past,  present or future
subscriber  to the capital  stock of, or  stockholder,  officer or director,  of
Trust  Company to perform  any  covenants  either  express or implied  contained
herein, all such liability,  if any, being expressly waived by the other parties
hereto and by any Person claiming by, through or under them, and (e) the


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<PAGE>



parties  hereto and any  Person  claiming  by,  through or under them shall look
solely to the Trust  Estate for the  performance  of any  obligation  under this
Participation Agreement or any other Operative Document; provided, however, that
nothing in this  Article  VIII shall be construed to limit in scope or substance
the general  corporate  liability  of Trust  Company in respect of (i) its gross
negligence or willful misconduct or its negligent handling of monies, (ii) those
representations,  warranties  and covenants of Trust  Company in its  individual
capacity set forth herein or in any of the other Operative Documents to which it
is a party, (iii) the consequences of its own acts or omissions in breach of the
Trust Agreement or constituting bad faith,  (iv) any Tax based on or measured by
any fees,  commission  or  compensation  received by it for acting as trustee in
connection with any of the transactions contemplated by the Operative Documents.
Nothing in this  Article  VIII shall be deemed to prevent any party  hereto from
having  recourse to and  seeking  enforcement  against  the Trust  Estate of any
covenants, agreements and conditions required to be performed or observed by the
Owner  Trustee (in its  individual  capacity  and as the Owner  Trustee) in this
Participation Agreement and the other Operative Documents.


                                   ARTICLE IX

                                  MISCELLANEOUS

                  Section 9.1 Notices.  Unless otherwise  specifically  provided
herein, all notices, consents, directions, approvals, instructions, requests and
other  communications  required or  permitted  by the terms  hereof  shall be in
writing,  and all such  communications  and all payments shall be deemed to have
been  duly  given  (w)  when  delivered  personally,  (x) when  telecopied  (and
confirmed) or (y) if delivered otherwise,  when actually received, and addressed
as follows:

                  If to NACC,

                  North American Chemical Company
                  8300 College Boulevard
                  Overland Park, Kansas  66210
                  Attention: Vice President/Assistant Treasurer
                  Telecopy No.: (913) 338-7921
                  Bank:             Barclays Bank PLC
                                    ABA No. 026 002 574
                                    Account for Payment: 050 785 737

                  If to HCNA:

                  Harris Chemical North America, Inc.
                  399 Park Avenue, 32nd Floor
                  New York, New York  10022
                  Attention: Chief Financial Officer or Treasurer
                  Telecopy No.: (212) 207-6440
                  Bank:    Barclays Bank PLC


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<PAGE>



                           Account for Payment: 050 785 737
                           ABA No. 026 002 574

                  If to Owner Participant:

                  [                         ]
                  Attention:  [                    ]
                  Telephone:  [               ]
                  Telecopy No.:  [               ]
                  Bank:     [                         ]
                  Account for Payment: [                ]
                  ABA No.: [               ]

                  If to Owner Trustee:

                  U.S. Trust Company of California, N.A.
                  515 South Flower Street
                  Suite 2700
                  Los Angeles, California 90071
                  Attention:  Ms. Sandra Leess
                  Telecopy No: (213) 489-3371

                  and

                  U.S. Trust Company of California, N.A.
                  c/o U.S. Trust Company of New York
                  114 West 47th Street
                  New York, New York 10036
                  Attention: Mr. Louis P. Young
                  Telecopy No.: (212) 852-1627

                  Bank:    Chase Manhattan Bank
                  ABA No.: 021000021
                  Account for Payment: 920-1-073-195
                  Reference: For credit to Searles Valley Trust (1996)
                                    Account Number: [               ]


with a copy to Owner Participant  (receipt of such copy,  however, is not notice
to Owner  Participant  in its  capacity as such).  From time to time,  any party
hereto  may  designate  a new  address  for  payment or for  purposes  of notice
hereunder by giving notice to each of the other parties.

                  Section 9.2  Counterparts;  Reproduction  of  Documents.  This
Participation  Agreement  may be  executed  by the  parties  hereto in  separate
counterparts, each of which when


                                       75

<PAGE>



so executed and delivered shall be an original,  but all such counterparts shall
together constitute but one and the same instrument. The Operative Documents and
all documents  relating  thereto,  including without  limitation,  (a) consents,
waivers  and  modifications  which may  hereafter  be  executed,  (b)  documents
received  by Owner  Participant  at the  closing on the  Closing  Date,  and (c)
financial statements, certificates and other information previously or hereafter
furnished to Owner  Participant,  may be reproduced by Owner  Participant by any
photographic,  photostatic,  microfilm,  micro-card,  miniature  photographic or
other similar process and Owner  Participant may destroy any original  documents
so  reproduced.   Each  party  hereto  agrees  and  stipulates   that  any  such
reproduction  shall be  admissible  in  evidence  as an  original  itself in any
judicial  or  administrative  proceeding  (whether  or not  the  original  is in
existence and whether or not such  reproduction was made by Owner Participant in
the regular course of business) and that any  enlargement,  facsimile or further
reproduction of such reproduction shall likewise be admissible in evidence.

                  Section  9.3  Further  Assurances.   Each  party  hereto  will
promptly and duly execute and deliver all such documents and assurances and take
such further  action as may be necessary  or  appropriate  in order to carry out
more  effectively  the intent  and  purpose of the  Operative  Documents  and to
establish and protect the rights and remedies  created or intended to be created
thereunder.

                  Section 9.4 Quiet  Enjoyment.  Each of Owner  Participant  and
Owner  Trustee  covenants  that during the Lease Term and so long as no Event of
Default has occurred and is continuing,  NACC shall  peaceably and quietly have,
hold and enjoy the  Facility  as lessee in  possession,  free from  molestation,
hindrance,  eviction or  disturbance by Lessor or by any other Person or Persons
lawfully claiming by, through or under Owner Trustee or Owner Participant.

                  Section  9.5  Survival.   All   warranties,   representations,
covenants  and  indemnities  made by any party herein or in any  certificate  or
other instrument delivered by such party or on the behalf of such party pursuant
to this Participation  Agreement shall be considered to have been relied upon by
each other party hereto  (notwithstanding  any  investigation  made by any party
hereto  or to any of the  other  Operative  Documents  or the fact that any such
party may waive  compliance  with any of the terms and  conditions of any of the
Operative  Documents)  and shall  survive  the  execution  and  delivery of this
Participation  Agreement and the other Operative  Documents and the consummation
of the transactions  contemplated by this  Participation  Agreement or any other
Operative Document.

                  Section 9.6 Confidentiality.  (a) For purposes of this Section
9.6,  "Confidential  Information"  means  information  delivered  to  the  Owner
Participant,  the Owner Trustee or the Power Contract Trustee by or on behalf of
NACC, HCNA or any Affiliate or Subsidiary of NACC or HCNA in connection with the
transactions contemplated by this Participation Agreement that is proprietary in
nature and that was marked or labeled or otherwise  adequately  identified  when
received by such Person as being  confidential  information of NACC, HCNA or any
of their  Subsidiaries  or Affiliates,  provided that such term does not include
information  that (a) was publicly known or otherwise known to such Person prior
to the time of such disclosure,  (b) subsequently becomes publicly known through
no act or omission by such Person or any


                                       76

<PAGE>



person  acting on behalf of such Person,  (c)  otherwise  becomes  known to such
Person  other  than  through  disclosure  by  NACC,  HCNA  or any  Affiliate  or
Subsidiary  of NACC or HCNA or (d)  constitutes  financial  statements  that are
otherwise publicly  available.  Owner  Participant,  Owner Trustee and the Power
Contract  Trustee  will  maintain  the   confidentiality  of  such  Confidential
Information;   provided,   however,   that   nothing   herein  or  in  any  such
confidentiality  agreement  shall  prevent  or be  construed  to  prevent  Owner
Participant or Owner Trustee from providing  information (i) to any Affiliate of
such  Person  (to  the  extent  such  disclosure   reasonably   relates  to  the
administration of the investment  represented by the Lease Financing  Documents)
or to any transferee of such Person (or  prospective  transferee of such Person)
that agrees to be  similarly  bound or  executes  and  delivers  an  appropriate
confidentiality  agreement,  (ii) upon the  order,  request  or demand of, or in
connection with any  investigation or audit by, any Authority,  (iii) that is in
the  public  domain  other  than  through  any  violation  hereof or of any such
confidentiality agreement or through any other action, in any such case, by such
Person,  (iv) that has been obtained from any Person that is not a party to this
Agreement or an Affiliate of any such party and who was not, to the knowledge of
Owner Participant or Owner Trustee (as the case may be), similarly bound, (v) in
connection  with  the  exercise  of any  remedy  hereunder  or under  any  other
Operative  Document,  to the extent such Person may  reasonably  determine  such
disclosure  to be  necessary  or  appropriate  in the  enforcement  or  for  the
protection of its rights and remedies under the Lease Financing Documents,  (vi)
as expressly  contemplated  by this Agreement or any other  Operative  Document,
(vii)  to  any  prospective  purchaser  or  lessee  of  the  Facility  or  Owner
Participant's  interest therein,  provided,  that such purchaser or lessee shall
have  agreed in writing to be bound by the  provisions  of this  Section  9.6 or
(viii)  to  the  auditors  or  attorneys  of  such  Person  who  agree  to  hold
confidential the Confidential  Information  substantially in accordance with the
terms of this Section  9.6(a).  The  agreements  and  obligations of the parties
contained  in  this  Section  9.6(a)  shall  survive  the  termination  of  this
Participation Agreement for a period of two years.

                  (b) Publicity Materials. Except as required by Applicable Law,
each of NACC and HCNA hereby  agrees  that it will not,  and will not permit any
one  acting  on  its  behalf,  to  issue,  authorize  or  release  for  external
publication or  distribution  any article,  press release,  advertising or other
publicity  material in any media disclosing the name of the Owner Participant or
its Affiliates, without the prior written consent of the Owner Participant.

                  Section 9.7 Intentionally Omitted.

                  Section 9.8 Amendments.  Neither this Participation  Agreement
nor any of the terms hereof may be terminated, amended, supplemented,  waived or
modified  orally,  but only by an  instrument  in  writing  signed by each party
hereto; and no such termination,  amendment,  supplement, waiver or modification
shall be  effective  unless a signed copy thereof  shall have been  delivered to
each party  hereto.  NACC agrees that it shall not amend the Other Lease without
the consent of the Owner Participant.

                  Section 9.9 Headings,  etc. The Table of Contents and headings
of the various Sections of this  Participation  Agreement are for convenience of
reference only and shall not modify, define, expand or limit any of the terms or
provisions hereof.


                                       77

<PAGE>




                  Section  9.10  Successors  and  Assigns.  The  terms  of  this
Participation  Agreement shall be binding upon, and inure to the benefit of, the
parties hereto and their respective successors and permitted assigns.

                  Section 9.11 Governing Law; Consent to  Jurisdiction;  Service
of Process;  Waiver of Immunities.  (a) This  Participation  Agreement  shall be
construed in accordance with and governed by the laws of the State of New York.

                  (b)  Each  of  the  parties  hereto  hereby   irrevocably  and
unconditionally submits to the non-exclusive  jurisdiction of any New York State
or United States  Federal court sitting in New York City and, in the event it is
a defendant,  of any court of its corporate domicile and the appellate courts of
any such  jurisdiction,  over any suit,  action or proceeding  arising out of or
relating to this Participation Agreement or the other Operative Documents.  Each
of the parties hereto  irrevocably and  unconditionally  waives,  to the fullest
extent permitted by law, any objection which it may now or hereafter have to the
laying of the venue of any such  suit,  action or  proceeding  brought in such a
court and any claim that any such suit,  action or proceeding  brought in such a
court has been brought in an inconvenient forum. To the extent that HCNA or NACC
has or hereafter may acquire any immunity from jurisdiction of any court or from
any legal  process  with respect to itself or its  property,  HCNA and NACC each
irrevocably waives such immunity in respect of its obligations  hereunder.  Each
of the parties  hereto  agree that final  judgment  in any such suit,  action or
proceeding  brought in such a court shall be  conclusive  and binding  upon such
party, and may be enforced in any court the jurisdiction of which such party, is
subject by a suit upon such judgment or in any manner provided by law, provided,
that  service of process is effected  upon such party as permitted by law, or in
the case of HCNA or NACC, in the manner specified in the following subsection or
as otherwise permitted by law.

                  (c) As long as any obligation of NACC or HCNA exists under the
Operative Documents,  each of HCNA and NACC will at all times have an authorized
agent in New York City,  upon whom  process may be served in any legal action or
proceeding arising out of or relating to this Participation  Agreement.  Service
of  process  upon  such  agent and  written  notice  of such  service  mailed or
delivered to HCNA or NACC, respectively, shall to the extent permitted by law be
deemed  in every  respect  effective  service  of  process  upon  HCNA and NACC,
respectively,  in any such  legal  action or  proceeding.  Each of HCNA and NACC
hereby irrevocably appoints CT Corporation System as its agent for such purpose,
and  covenants  and  agrees  that  service  of  process  in any suit,  action or
proceeding  may be made upon  such  party at the  office  of such  agent at 1633
Broadway, New York, New York 10019, U.S.A.  Notwithstanding the foregoing,  HCNA
or NACC may, with prior written notice to the Trustee, terminate the appointment
of CT  Corporation  System and appoint  another agent for the above  purposes so
that HCNA and NACC shall each at all times have an agent for the above  purposes
in New York City.

                  (d) Each of HCNA and NACC hereby  irrevocably  waives,  to the
fullest  extent  permitted by law, any  requirement  or other  provision of law,
rule,  regulation  or practice  which  requires or  otherwise  establishes  as a
condition to the institution,  prosecution or completion of any suit,  action or
proceeding (including appeals) arising out of or relating to this Participation


                                       78

<PAGE>



Agreement  or the other  Operative  Documents,  the  posting  of any bond or the
furnishing, directly or indirectly, of any other security.

                  Section 9.12 Severability. Any provision of this Participation
Agreement which is prohibited or unenforceable in any jurisdiction  shall, as to
such  jurisdiction  only, be  ineffective  to the extent of such  prohibition or
unenforceability  without  invalidating the remaining provisions hereof, and any
such prohibition or unenforceability in any jurisdiction shall not invalidate or
render  unenforceable  such provision in any other  jurisdiction.  To the extent
permitted  by  Applicable  Law,  each of the parties  hereto  hereby  waives any
provision of law that renders any provision  hereof  prohibited or unenforceable
in any respect.

                  Section  9.13  Waiver  of Trial by Jury.  EACH OF THE  PARTIES
HERETO  HEREBY  IRREVOCABLY  WAIVES  ALL  RIGHT OF TRIAL BY JURY IN ANY  ACTION,
PROCEEDING OR  COUNTERCLAIM  ARISING OUT OF OR IN CONNECTION WITH THIS AGREEMENT
OR ANY OTHER OPERATIVE DOCUMENT OR ANY MATTER ARISING HEREUNDER OR THEREUNDER.

                  Section 9.14 Obligation of Owner  Participant to Return Letter
of Credit.  Owner  Participant  agrees for the  benefit of NACC and HCNA that it
shall return the Letter of Credit as required pursuant to the Lease.


                                       79

<PAGE>



                  IN WITNESS  WHEREOF,  the  parties  hereto  have  caused  this
Participation  Agreement  to be  duly  executed  by  their  respective  officers
thereunto duly authorized as of the date and year first above written.



                                       NORTH AMERICAN CHEMICAL COMPANY


                                       By:  ____________________________________
                                            Name:
                                            Title:



                                       HARRIS CHEMICAL NORTH AMERICA, INC.


                                       By:  ____________________________________
                                            Name:
                                            Title:



                                       [OWNER PARTICIPANT]


                                       By:  ____________________________________
                                            Name:
                                            Title:



                                       U.S. TRUST COMPANY OF  CALIFORNIA,  N.A.,
                                       not in its individual  capacity except to
                                       the extent expressly provided herein, but
                                       solely as Owner  Trustee  under the Trust
                                       Agreement


                                       By:  ____________________________________
                                            Name:
                                            Title:



                                       80

<PAGE>



                                   SCHEDULE I


                               Pricing Assumptions
































                                 Schedule I - 1

<PAGE>



                                   SCHEDULE II


                             Certain Permitted Liens






























                                 Schedule II - 1

<PAGE>



                                 SCHEDULE 4.1(l)


                             Environmental Approvals































                               Schedule 4.1(l) - 1

<PAGE>



                                 SCHEDULE 4.1(o)


                                     Filings






























                               Schedule 4.1(o) - 1

<PAGE>



                                 SCHEDULE 5.1(c)


                                    Consents






























                               Schedule 5.1(c) - 1

<PAGE>



                                 SCHEDULE 5.1(q)


                              Condition of Facility






























                               Schedule 5.1(q) - 1

<PAGE>



                                 SCHEDULE 5.1(u)


                            Environmental Compliance






























                               Schedule 5.1(u) - 1

<PAGE>



                                SCHEDULE 5.1(aa)


                           Restrictions and Covenants






























                              Schedule 5.1(aa) - 1

<PAGE>


                                SCHEDULE 5.1(bb)


                               Pending Assessments






























                              Schedule 5.1(bb) - 1

<PAGE>




                                FORM OF ANNEX A
                                ---------------

                                     ANNEX A


                           SEARLES VALLEY TRUST (1996)
                     LEASE FINANCING OF ARGUS UTILITY PLANT


                         DEFINITIONS AND RULES OF USAGE
                       RELATING TO THE OPERATIVE DOCUMENTS


                  Rules of Usage.  The  following  rules of usage shall apply to
this  Annex A and the  Operative  Documents  unless  otherwise  required  by the
context:

                  (a) Singular  words  shall  connote  the plural as well as the
         singular, and vice versa (except as indicated), as may be appropriate.

                  (b) Unless otherwise indicated, references within any document
         to appendices,  articles, schedules,  sections,  paragraphs, clauses or
         exhibits are references to appendices,  articles, schedules,  sections,
         paragraphs, clauses or exhibits in or to such document.

                  (c) The headings, subheadings and table of contents are solely
         for  convenience  of reference  and shall not  constitute a part of any
         such document nor shall they affect the meaning, construction or effect
         of any provision thereof.

                  (d) References  to any Person shall  include such Person,  its
         successors and permitted assigns and transferees.

                  (e) Except as otherwise expressly  provided,  reference to any
         agreement  means such  agreement as amended,  modified or  supplemented
         from time to time in accordance with the applicable provisions thereof.

                  (f) Unless  otherwise  specified  herein  or  with  the  prior
         consent  of  the  Owner   Participant,   which  consent  shall  not  be
         unreasonably  withheld,  all accounting  determinations under the Lease
         Financing  Documents and all computations  utilized by HCNA and NACC in
         complying with the covenants contained in the Lease Financing Documents
         shall be made and all  accounting  terms  used in the  Lease  Financing
         Documents  shall be interpreted in accordance  with Generally  Accepted
         Accounting Principles applied on a consistent basis, except as required
         to reconcile such determinations, computations and interpretations with
         generally accepted accounting



<PAGE>



         principles  as  then  applied  in  the  preparation  of  the  financial
         statements of HCNA and NACC.

                  (g) References to  "including"  shall mean  including  without
         limiting the generality of any description  preceding such term and for
         purposes  hereof the rule of ejusdem generis shall not be applicable to
         limit a general  statement,  followed by or referable to an enumeration
         of  specific  matters,   to  matters  similar  to  those   specifically
         mentioned.

                  (h) Each of the  parties to the  Operative  Documents  and its
         counsel  have  reviewed and revised,  or  requested  revisions  to, the
         Operative  Documents,  and the  usual  rule of  construction  that  any
         ambiguities  are to be  resolved  against the  drafting  party shall be
         inapplicable in the  construction and  interpretation  of the Operative
         Documents.

                  "Account  Bank  Agreement"  shall mean an agreement  between a
bank  and  NACC  substantially  in the form of  Exhibit  Z to the  Participation
Agreement.

                  "ACE  Facility"  shall  mean  the  ACE  Cogeneration  Facility
located adjacent to the Complex.

                  "Adjustment"  shall mean any  recomputation  of the Basic Rent
amounts pursuant to Article III of the  Participation  Agreement and any related
adjustments.

                  "Affiliate"  of any  specified  Person  shall  mean any  other
Person  directly or indirectly  controlling  or controlled by or under direct or
indirect  common  control  with such  specified  Person.  For  purposes  of this
definition,  "control" when used with respect to any Person shall mean the power
to direct the  management  and policies of such Person,  directly or indirectly,
whether  through the ownership of voting  securities,  by contract or otherwise;
and the terms "controlling" and "controlled" shall have meanings  correlative to
the foregoing.  Notwithstanding the foregoing, for purposes of Article VI of the
Participation  Agreement  only, a Person will not be deemed to be an "Affiliate"
of HCNA or a  Restricted  Subsidiary  of HCNA solely by reason of the control of
such Person by HCNA or one or more Restricted  Subsidiaries  of HCNA;  provided,
that no other  Affiliate  of HCNA has an  ownership  interest  in or directly or
indirectly controls such Person.

                  "After-Tax  Basis" shall have the meaning specified in Section
1(b) of the Tax Indemnity Agreement.

                  "Allocation  Agreement"  shall  mean  the  Agreement  for  the
Allocation of Production  and  Calculation  of Mineral  Royalties,  Searles Lake
California,  dated  January 1, 1996,  between the United  States of America,  as
represented  by  the  Associate  Director  for  Royalty   Management,   Minerals
Management Service, the BLM and NACC.



                                        2

<PAGE>



                  "Applicable Law" shall mean (a) all applicable  common law and
principles of equity and (b) all applicable provisions of all (i) constitutions,
statutes,  laws, ordinances,  codes, policies,  rules, regulations and orders of
governmental  bodies,  (ii) Approvals and (iii) orders,  decisions,  directives,
judgements and decrees of all courts (whether at law or in equity or admiralty),
governmental bodies, regulatory agencies and arbitrators, including, in all such
cases and without limitation, all Environmental Laws.

                  "Appraisal" shall have the meaning specified in Section 4.2(a)
of the Participation Agreement.

                  "Appraisal  Procedure"  shall mean the procedure  specified in
this  definition  for  determining  an amount,  value,  useful life of, or other
matter with respect to, the Facility,  the Undivided Interest therein, the Site,
the Leasehold Estate or any Modification  (except in the case of  determinations
pursuant  to  Section  18 of the  Lease).  If the  Owner  Participant  (or Owner
Trustee) and NACC are required to determine any amount,  value,  useful life of,
or other matter with respect to, the Facility,  the Undivided  Interest therein,
the Site,  the  Leasehold  Estate  or any  Modification  (except  in the case of
determinations  pursuant to Section 18 of the Lease), then Owner Participant and
NACC shall consult for the purpose of  determining  such amount,  value,  useful
life of, or other matter by mutual agreement.  If the Owner Participant and NACC
are unable to reach mutual agreement with respect to any amount,  value,  useful
life of, or other matter required to be determined by the Appraisal Procedure on
or before the  thirtieth  (30th) day  following  commencement  of the  Appraisal
Procedure,  either the Owner  Participant  or NACC may give  notice to the other
requesting  determination of such amount, value, useful life of, or other matter
to be determined by an appraisal,  and, in such event, the Owner Participant and
NACC may each appoint a qualified,  disinterested and MAI-certified and licensed
industrial  property  appraiser within ten (10) Business Days following the date
of such notice requesting determination by appraisal. For an Appraisal Procedure
with respect to the Facility as a whole, such amount,  value, useful life of, or
other matter shall be  determined by the  appraisers  applying  methodology  and
otherwise on a basis consistent with the Appraisal.  If the appraisers appointed
by the Owner  Participant  and NACC are unable to agree upon the amount,  value,
useful life of, or other matter in question  within  twenty (20)  Business  Days
following their final appointment, such appraisers shall jointly appoint a third
qualified,  disinterested  and MAI-certified  and licensed  industrial  property
appraiser  or, if such  appraisers do not appoint a third  appraiser,  the Owner
Participant and NACC shall jointly appoint the third  appraiser.  Each appraiser
appointed  pursuant to the foregoing  procedure shall be instructed to determine
such amount, value or useful life within twenty (20) Business Days following its
appointment.  If either  party does not  appoint its  appraiser  within ten (10)
Business  Days  following  the date of the notice  requesting  determination  by
appraisal,  the  determination  of the other  appraiser  shall be conclusive and
binding upon such party.  If the two  appraisers  appointed by the parties agree
upon the amount,  value, useful life or other matter in question, or if a single
appraiser shall have been appointed by the parties,  the  determination  of such
appraiser(s)  shall  be  final  and  binding  upon  the  parties,  and if  three
appraisers  shall have been appointed,  the separate  determinations  of each of
such three  appraisers  shall be averaged and such average shall  constitute the
determination  of the  appraisers  which  determination  shall be conclusive and
binding on the parties; provided, that if


                                        3

<PAGE>



the determination of one appraiser is disparate from the middle determination by
more that twice the amount by which the third  determination  is disparate  from
the middle determination, then the determination of the most disparate appraiser
shall be excluded,  and the average of the remaining two determinations shall be
conclusive  and binding on the Owner  Participant  and NACC. The expenses of the
Appraisal  Procedure shall be shared equally by the Owner  Participant and NACC,
except that (a) in the case of an Appraisal  Procedure  pursuant to Sections 18,
20 and 21 of the Lease all such expenses shall be borne solely by Lessee and (b)
in the case of an  Appraisal  Procedure  pursuant to Section 10 of the Lease all
such  expenses  shall  be  borne  solely  by  Lessor.   Any  fair  market  value
determination  of a Severable  Modification  shall take into  consideration  any
liens or  encumbrances  to which the Severable  Modification  being appraised is
subject and which are being assumed by the transferee.

                  "Appraiser" shall mean American Appraisal Associates.

                  "Approvals"   shall   mean   all   permits,    authorizations,
registrations,   franchises,   consents,   approvals,   rate  orders,   waivers,
exceptions,  variances, claims, orders, judgments,  interpretations and decrees,
licenses, exemptions,  publications,  filings, notices to and declarations of or
with any Authority and shall include,  without  limitation,  those pertaining to
Environmental  Laws,  and all siting,  environmental  and operating  permits and
licenses  that are required  under  Applicable  Law for the use,  operation  and
maintenance  of the  Facility  and the  Site as  contemplated  by the  Operative
Documents, and to the extent applicable to such use, operation or maintenance of
the Facility and the Site, of the Complex.

                  "Approved   Sublessee"   shall  mean  (a)  any  entity   whose
outstanding debt obligations that have a remaining average life at least as long
as the average life of the  remaining  Basic Rent under the Lease are rated BBB-
or better by  Standard  & Poor's or Baa3 or better by Moody's or (b) HCNA or any
direct or indirect  subsidiary  of HCNA  organized  under the laws of the United
States or any state thereof.

                  "Argus  Utility  Bill of  Sale"  shall  mean  the Bill of Sale
substantially in the form of Exhibit A to the Participation Agreement.

                  "Argus  Utility Deed of  Improvements"  shall mean the Deed of
Improvements  substantially  in the  form  of  Exhibit  B to  the  Participation
Agreement.

                  "Argus Utility Plant" shall mean the coal and gas-fired  steam
and  electricity  generation  facility  located  within  the  Complex,  as  more
particularly described in Schedule I to the Lease.

                  "Asset  Disposition"  by any Person  shall mean any  transfer,
conveyance,  sale,  lease  or other  disposition  by such  Person  or any of its
Restricted  Subsidiaries  (including a consolidation  or merger or other sale of
any such Restricted  Subsidiary with, into or to another Person in a transaction
in which such Restricted  Subsidiary ceases to be a Restricted  Subsidiary,  but
excluding a  disposition  (a) by a  Restricted  Subsidiary  of HCNA to HCNA or a
Restricted


                                        4

<PAGE>



Subsidiary of HCNA, (b) by HCNA to a Restricted  Subsidiary of HCNA, (c) by HCNA
or any Restricted  Subsidiary of HCNA to an entity in exchange solely for Voting
Stock of such entity as a part of a commercial joint venture arrangement related
to the  business of HCNA or (d) of any assets  constituting  collateral  pledged
under any Working  Capital  Facility)  resulting  in Net  Available  Proceeds in
excess of $1  million  of (i) shares of Capital  Stock  (other  than  directors'
qualifying shares) or other ownership  interests of a Subsidiary of such Person,
(ii)  substantially  all of the assets of such Person or any of its Subsidiaries
representing  a division or line of business or (iii) other  assets or rights of
such  Person  or any of its  Subsidiaries  outside  of the  ordinary  course  of
business;  provided,  however,  that an Asset  Disposition  that is  otherwise a
Restricted  Payment  under  Section  6.2(e)  shall  not be deemed to be an Asset
Disposition.

                  "Assignment' shall have the meaning specified in Section 15 of
the Lease.

                  "Assuming  Person" shall have the meaning specified in Section
7.3 of the Participation Agreement.

                  "Authority"  shall  mean  any  (a)  federal,  state  or  local
government  or  subdivision   thereof  and  any  entity  exercising   executive,
legislative,   judicial  or   administrative   functions  of  or  pertaining  to
government,  or (b) arbitrator or panel of  arbitrators,  in the case of each of
clause (a) and (b) having or  exercising  jurisdiction  over NACC,  HCNA,  Owner
Participant,  Owner Trustee, the Facility or the Undivided Interest therein, the
Easement Site or the Site or the Undivided Interest therein.

                  "Average  Sales  Percentage"  shall mean,  with respect to any
period,  the ratio  (expressed  as a  percentage)  of (x) the annual  average of
highway  deicing  salt  sales  (in  tons)  to (y)  the  annual  average  of Salt
Commitments,  in each case for the  preceding  four fiscal years and the current
fiscal year of HCNA and its Restricted Subsidiaries.

                  "Average   Weighted   Life"   means,   as  of  the   date   of
determination,  with respect to any Debt or remaining  Basic Rent,  the quotient
obtained  by dividing  (i) the sum of the  products of the numbers of years from
the date of determination to the dates of each successive scheduled principal or
Basic Rent payments of such Debt or remaining Basic Rent, respectively,  and the
amount of such  principal  or Basic Rent  payments,  by (ii) the sum of all such
principal or Basic Rent payments.

                  "Basic Rent" shall mean,  for the Basic Term, the rent payable
pursuant to Section 4(a) of the Lease (as the same may be adjusted  from time to
time),  and,  for any  Renewal  Term,  shall mean the rent  payable  pursuant to
Section 20(b) of the Lease.

                  "Basic Rent Payment  Date" shall mean August 15, 1996 and each
Semiannual Rent Payment Date thereafter.

                  "Basic Term" shall have the meaning  specified in Section 3 of
the Lease.



                                        5

<PAGE>



                  "Basic Term Commencement Date" shall mean August 15, 1996.

                  "BLM"  shall mean the United  States  Department  of  Interior
Bureau of Land Management.

                  "BLM Leases" shall mean those certain mineral leases listed on
Attachment 1 to the Allocation Agreement.

                  "Board of  Directors"  shall  mean with  respect to any Person
either its Board of Directors or any duly authorized committee of that board.

                  "Board  Resolution"  shall mean, with respect to any Person, a
copy of a resolution  certified by the secretary or assistant  secretary of such
Person to have been duly  adopted  by its Board of  Directors  and to be in full
force and effect on the date of such certification.

                  "Break  Costs"  shall  mean with  respect  to the  amount  (x)
payable by NACC to Owner Trustee on the Termination  Date pursuant to Section 12
of the Lease and (y) payable to Owner  Participant or Owner Trustee  pursuant to
Section 6.5 of the Participation Agreement, an amount, not less than zero, equal
to: (i) the Discounted Value (Yield); plus (ii) the Discounted Value (Investment
Recovery);  plus  (iii)  the  Discounted  Value  (Termination);  minus  (iv) the
applicable Stipulated Loss Value.

                  "Breakage  Treasury  Yield"  shall  mean with  respect  to the
calculation  of Break  Costs  on any  Determination  Date,  the per  annum  rate
(expressed as a semiannual  equivalent  rounded to the nearest 0.0001 percentage
point  and,  in the  case  of  United  States  Treasury  bills,  converted  to a
bond-equivalent  yield)  determined  to be  equal  to the  semiannual  yield  to
maturity for United States Treasury  securities with a weighted  average life to
maturity  (calculated in accordance with accepted  financial  practice) equal to
the Weighted  Average  Life to Maturity on such date,  as  determined  by linear
interpolation  between the most recent weekly average yields to maturity for two
series of United  States  Treasury  securities,  (i) the first  with a  weighted
average life to maturity  (calculated  in  accordance  with  accepted  financial
practice) as close as possible to, but earlier than,  the Weighted  Average Life
to Maturity on such date,  and (ii) the second with a weighted  average  life to
maturity (calculated in accordance with accepted financial practice) as close as
possible to, but later than, the Weighted Average Life to Maturity on such date,
in each case as published in the most recent H.15 (519) (or, if a weekly average
yield to maturity for United States Treasury  securities with a weighted average
life to maturity  (calculated in accordance  with accepted  financial  practice)
equal to the  Weighted  Average Life to Maturity on such date is reported in the
most recent H.15 (519), such weekly average yield to maturity). H.15 (519) means
"Statistical  Release H.15 (519),  Selected  Interest  Rates",  or any successor
publication,  published by the Board of Governors of the Federal Reserve System.
The most recent H.15 (519) means the latest H.15 (519) which is published  prior
to the close of business on the third  Business  Day  preceding  the  applicable
Determination Date.



                                        6

<PAGE>



                  "Business  Day"  shall  mean any day  other  than a  Saturday,
Sunday or other day on which banks are  required or  authorized  to be closed in
the State of New York or in the place in which the principal office of the Owner
Trustee is located.

                  "Capital  Expenditures" of any Person shall mean  expenditures
by such  Person in  respect of the  purchase  or other  acquisition  of fixed or
capital assets having a useful life of greater than one year (excluding,  to the
extent otherwise  included herein,  interest  capitalized  during such period in
accordance  with  Generally  Accepted  Accounting  Principles)  which would,  in
accordance  with  Generally  Accepted  Accounting  Principles,  be set  forth as
capital expenditures on a consolidated statement of cash flows of such Person.

                  "Capital  Lease  Obligation"  of any  Person  shall  mean  the
obligation to pay rent or other payment  amounts under a lease of (or other Debt
arrangements  conveying  the right to use)  real or  personal  property  of such
Person which is required to be  classified  and accounted for as a capital lease
or a liability on the face of a balance sheet of such Person in accordance  with
Generally Accepted Accounting Principles. The stated maturity of such obligation
shall be the date of the last payment of rent or any other amount due under such
lease  prior to the first date upon which  such lease may be  terminated  by the
lessee without payment of a penalty.

                  "Capital  Stock" of any Person  shall mean any and all shares,
interests, participations or other equivalents (however designated) of corporate
stock of such Person.

                  "Cash  Deposit"  shall  mean an amount of cash at all times at
least equal to the  Drawing  Amount  deposited  in the Lessor  Security  Account
pursuant to the Account Bank Agreement.

                  "Cash Equivalents" shall mean at any time, (a) any evidence of
Debt with a maturity of 180 days or less issued or directly and fully guaranteed
or  insured by the  United  States of  America or any agency or  instrumentality
thereof  (provided,  that the full  faith  and  credit of the  United  States of
America  is  pledged  in  support  thereof);  (b)  certificates  of  deposit  or
acceptances  with a maturity  of 180 days or less of any  financial  institution
that is a member of the  Federal  Reserve  System  having  combined  capital and
surplus and undivided  profits of not less than  $500,000,000 and rated at least
A- by  Standard  & Poor's  or at least A3 by  Moody's,  or,  in the event of any
change in the rating system  employed by either such agency,  the  equivalent or
better of the ratings specified above then employed by such agency, or if either
such agency no longer publishes  ratings,  the equivalent rating as published by
another  Rating Agency;  (c) commercial  paper with maturity of 180 days or less
issued by a  corporation  (except HCNA or an Affiliate  or  Subsidiary  of HCNA)
organized  under the laws of any state of the United  States or the  District of
Columbia  and rated at least A-1 by Standard & Poor's or at lease P-1 by Moody's
or, in the event of any  change in the rating  system  employed  by either  such
agency, the equivalent or better of the ratings specified above then employed by
such  agency,  or if  either  such  agency  no  longer  publishes  ratings,  the
equivalent  rating as published by another  Rating  Agency;  and (d)  repurchase
agreements  and reverse  repurchase  agreements  relating to  marketable  direct
obligations issued or unconditionally guaranteed by the United


                                        7

<PAGE>



States of America or issued by any agency  thereof  and backed by the full faith
and credit of the United  States of America,  in each case  maturing  within one
year from the date of acquisition;  provided,  that the terms of such agreements
comply with the  guidelines  set forth in the Federal  Financial  Agreements  of
Depository  Institutions  With Securities  Dealers and Others, as adopted by the
Comptroller of the Currency on October 31, 1985.

                  "Closing"  shall have the meaning  specified in Section 2.1 of
the Participation Agreement.

                  "Closing  Date"  shall  mean July 15,  1996 or such other date
agreed to by the Owner  Participant and NACC that the transactions  contemplated
by Section 2.1 of the Participation Agreement are consummated.

                  "Closing Date Notice" shall mean a notice  delivered  pursuant
to Section 2.2 of the Participation Agreement.

                  "Coal Supply  Agreement" shall mean the Coal Purchase and Sale
Agreement  dated as of December 30, 1994, by and between NACC and Coastal States
Energy Company.

                  "Coal   Transportation   Agreement"   shall   mean   the  Rail
Transportation  Agreement,  effective  as of November 5, 1994,  by and among the
Denver and Rio Grande Western Railroad Company,  Southern Pacific Transportation
Company, Trona Railway Company and NACC.

                  "Code"  shall  mean the  Internal  Revenue  Code of  1986,  as
amended from time to time.

                  "Commitment"  shall  have the  meaning  specified  in  Section
2.1(a) of the Participation Agreement.

                  "Common  Stock" of any Person shall mean Capital Stock of such
Person that does not rank prior,  as to the  payment of  dividends  or as to the
distribution   of  assets  upon  any  voluntary  or   involuntary   liquidation,
dissolution  or winding  up of such  Person,  to shares of Capital  Stock of any
other class of such Person.

                  "Competitor" shall mean any Person that is engaged directly or
indirectly  through  one or more of its  Affiliates  in the  business of mining,
processing  or sale of products  mined or  processed  by any  Affiliate of HCNA;
provided,  however, that institutional investors in the business of investing in
assets  such as the  Facility  shall  not be deemed  competitors  of HCNA or any
Affiliate thereof.

                  "Complex"  shall mean,  collectively,  the  industrial  plants
commonly known as the "Argus  Plant," the "Trona Plant" and the "Westend  Plant"
and all related facilities, located in Trona, California.



                                        8

<PAGE>



                  "Consolidated  Cash Flow  Ratio" of any Person  shall mean for
any period the ratio of (a) Consolidated  Operating Cash Flow of such Person for
such period to (b) the sum of (i)  Consolidated  Interest Expense of such Person
for  such  period  plus  (ii)  the  annual  interest   expense   (excluding  the
amortization  of debt  issuance  costs) with respect to any Debt  proposed to be
Incurred by such Person or its Restricted  Subsidiaries minus (iii) Consolidated
Interest  Expense of such Person to the extent  included  in Clause  (b)(i) with
respect  to any Debt  that  will no  longer  be  outstanding  as a result of the
Incurrence  of the Debt  proposed to be Incurred  plus (iv) the annual  interest
expense  (excluding the amortization of debt issuance costs) with respect to any
other Debt Incurred by such Person or its Restricted  Subsidiaries since the end
of  such  period  to  the  extent  not  included  in  Clause  (b)(i)  minus  (v)
Consolidated  Interest  Expense of such Person to the extent  included in Clause
(b)(i) with respect to any Debt that no longer is outstanding as a result of the
Incurrence of Debt by such Person or its Restricted  Subsidiaries  since the end
of  such  period;  provided,  however,  that in  making  such  computation,  the
Consolidated  Interest  Expense of such Person  attributable  to interest on any
Debt bearing a floating  interest rate shall be computed on a pro forma basis as
if the rate in effect on the date of computation  had been the  applicable  rate
for the entire period;  provided,  further, that in the event such Person or its
Restricted  Subsidiaries  has made Asset  Dispositions or acquisitions of assets
not in the ordinary course of business (including  acquisitions of other Persons
by merger,  consolidation  or  purchase of Capital  Stock)  during or after such
period,  such  computation  shall be made on a pro  forma  basis as if the Asset
Dispositions or acquisitions had taken place on the first day of such period.

                  "Consolidated  Cash  Interest  Expense"  for any  period  with
respect to any Person,  shall mean an amount equal to (a) Consolidated  Interest
Expense of such Person and its Restricted  Subsidiaries  for such period,  minus
(b)  any  non-cash  interest  expense  included  in such  Consolidated  Interest
Expense.

                  "Consolidated  EBITDA"  for any  period  with  respect  to any
Person,  shall mean an amount equal to  consolidated  income  before taxes on or
measured  by net income or gain (as  determined  in  accordance  with  Generally
Accepted  Accounting  Principles)  for  such  period  of  such  Person  and  its
Restricted Subsidiaries on a consolidated basis:

                  (a) minus,  to  the  extent  included  in the  computation  of
         consolidated  income before taxes,  interest  income and income or gain
         from  extraordinary   items  for  such  period,  all  determined  on  a
         consolidated  basis for such Person and its Restricted  Subsidiaries in
         accordance with Generally Accepted Accounting Principles;

                  (b) plus,  to  the  extent  deducted  in  the  computation  of
         consolidated income before taxes, the sum of (i) Consolidated  Interest
         Expense  (including,  without  limitation,  interest expense imputed in
         respect of any Capital  Lease  Obligations),  (ii) expense or loss from
         extraordinary  items  for such  period,  (iii)  depreciation  and other
         non-cash charges against income for such period and (iv) amortized debt
         discount for such period,  all determined on a  consolidated  basis for
         such  Person  and  its  Restricted   Subsidiaries  in  accordance  with
         Generally Accepted Accounting Principles.



                                        9

<PAGE>




                  "Consolidated Income Tax Expense" of any Person shall mean for
any period the  consolidated  provision  for income taxes of such Person and its
Restricted  Subsidiaries for such period  calculated on a consolidated  basis in
accordance with Generally Accepted Accounting Principles.

                  "Consolidated Interest Expense" for any period with respect to
any  Person,  shall  mean  interest  expense of such  Person and its  Restricted
Subsidiaries  for such period  (excluding the effects of  capitalizing  interest
with respect to Capital Expenditures and any amortization of capitalized finance
fees),  determined on a consolidated basis in accordance with Generally Accepted
Accounting Principles.

                  "Consolidated  Net  Income" of any  Person  shall mean for any
period the consolidated net income (or loss) of such Person and its Subsidiaries
(after minority interests and dividends paid on Preferred Stock) for such period
determined  on a  consolidated  basis  in  accordance  with  Generally  Accepted
Accounting Principles;  provided, that there shall be excluded therefrom (a) the
net income  (or loss) of any  Person  acquired  by such  Person or a  Restricted
Subsidiary of such Person in a  pooling-of-interests  transaction for any period
prior to the date of such transaction,  (b) the net income (but not net loss) of
any Restricted  Subsidiary of such Person which is subject to restrictions which
prevent the payment of dividends or the making of  distributions  to such Person
to the extent of such  restrictions,  (c) the net income (or loss) of any Person
that is not a Restricted  Subsidiary  of such Person except to the extent of the
amount of dividends or other distributions  actually paid to such Person by such
other Person during such period,  (d) gains or losses on Asset  Dispositions  by
such Person or its Restricted  Subsidiaries and (e) all extraordinary  gains and
extraordinary losses.

                  "Consolidated  Operating  Cash Flow" of any Person  shall mean
for any period the  Consolidated  Net Income of such Person for such period plus
(a)  Consolidated  Interest  Expense of such  Person for such  period,  plus (b)
Consolidated  Income Tax  Expense of such Person for such  period,  plus (c) the
consolidated  depreciation  and  amortization  expense  included  in the  income
statement of such Person and its consolidated  Restricted  Subsidiaries for such
period,  plus (d) other non-cash charges deducted from consolidated  revenues in
determining  Consolidated  Net Income for such period,  minus (e) non-cash items
increasing consolidated revenues in determining Consolidated Net Income for such
period.

                  "Consolidated Tangible Net Worth" of any Person shall mean the
consolidated   stockholders'   equity  of  such   Person   and  its   Restricted
Subsidiaries,  determined on a consolidated  basis in accordance  with Generally
Accepted Accounting  Principles,  minus (a) amounts attributable to Disqualified
Stock of such  Person,  (b) the cost of  treasury  shares,  and (c) the net book
value of all assets  that are  classified  as  intangibles  in  accordance  with
Generally Accepted Accounting  Principles (without  duplication of deductions in
respect of items  already  deducted in  calculating  consolidated  stockholders'
equity) but in any event including  goodwill,  deferred research and development
costs, trademarks,  trade names, copyrights,  licenses,  patents and franchises,
unamortized  debt  discount,  and any  write-up  in the  book  value  of  assets
resulting


                                       10

<PAGE>



from a  revaluation  thereof  subsequent  to  March  30,  1996,  in  each  case,
determined in accordance with Generally Accepted Accounting Principles.

                  "CPI-U"  shall  mean the  Consumer  Price  Index for All Urban
Consumers as published by the United States Department of Labor, Bureau of Labor
Statistics.  If the Consumer Price Index for All Urban Consumers ceases to exist
or is no longer  available,  HCNA,  with the  consent  of the Owner  Participant
(which consent shall not be unreasonably withheld), shall designate a substitute
index that is  reasonably  similar  to the  Consumer  Price  Index for All Urban
Consumers.

                  "CPI-U  Factor" shall mean,  with respect to each fiscal year,
the CPI-U  published  with  respect  to March of such year  divided by the CPI-U
published with respect to March 1996; provided,  however, that such CPI-U Factor
shall not be less than one (1).

                  "Debt" shall mean (without  duplication),  with respect to any
Person, whether recourse is to all or a portion of the assets of such Person and
whether  or not  contingent,  (i)  every  obligation  of such  Person  for money
borrowed,  (ii) every obligation of such Person evidenced by bonds,  debentures,
notes or other similar instruments, including obligations Incurred in connection
with  the   acquisition  of  property,   assets  or   businesses,   (iii)  every
reimbursement  obligation  of such  Person  with  respect  to letters of credit,
bankers'  acceptances  or  similar  facilities  issued  for the  account of such
Person,  (iv) every  obligation of such Person issued or assumed as the deferred
purchase price of property or services (but excluding trade accounts  payable or
accrued  liabilities  arising in the  ordinary  course of  business),  (v) every
Capital  Lease  Obligation  of such  Person,  (vi) the maximum  fixed  mandatory
redemption or repurchase price of Disqualified  Stock of such Person at the time
of  determination,  (vii) every net  obligation  under Interest Rate or Currency
Protection  Agreements  of such Person and (viii) every  obligation  of the type
referred to in Clauses (i) through (vii) of another  Person and all dividends of
another Person the payment of which,  in either case, such Person has Guaranteed
or is responsible or liable,  directly or indirectly,  as obligor,  Guarantor or
otherwise.

                  "Deemed Refund or Credit" shall have the meaning  specified in
Section 7.4(e) of the Participation Agreement.

                  "Default" shall mean an event or condition which,  with notice
or lapse of time or both, would become an Event of Default.

                  "Depreciation  Deductions" shall have the meaning specified in
the Tax Indemnity Agreement.

                  "Determination  Date" shall mean one of the dates set forth in
Schedule IV to the Lease for which a Stipulated Loss Value is specified.

                  "Discount  Rate"  shall mean twelve  percent  (12%) per annum,
compounded  semiannually  and computed on the basis of a 360-day year consisting
of twelve 30-day months.


                                       11

<PAGE>




                  "Discounted  Value  (Investment  Recovery)"  shall  mean  with
respect to the calculation of Break Costs on any Determination  Date, the amount
calculated  by  discounting  to  such  Determination  Date:  (i) for  each  then
remaining  Stipulated  Loss Value,  including the Stipulated  Loss Value on such
Determination  Date but excluding the last  Stipulated Loss Value of Schedule IV
to the Lease, an amount equal to (A) such  Stipulated Loss Value,  minus (B) the
next  succeeding  Stipulated  Loss Value;  (ii) from the day one calendar  month
after such  Determination  Date for each such  Stipulated Loss Value; at (iii) a
discount rate (applied on a simple monthly basis) equal to the Breakage Treasury
Yield, all in accordance with accepted financial practice.

                  "Discounted  Value  (Termination)"  shall mean with respect to
the calculation of Break Costs on any Determination  Date, the amount calculated
by discounting to such date: (i) the last  Stipulated  Loss Value of Schedule IV
to the Lease;  (ii) from the  Determination  Date  applicable to such Stipulated
Loss Value;  at (iii) a discount rate (applied on a simple  monthly basis) equal
to the Breakage  Treasury  Yield,  all in  accordance  with  accepted  financial
practice.

                  "Discounted  Value  (Yield)"  shall  mean with  respect to the
calculation of Break Costs on any  Determination  Date, the amount calculated by
discounting to such date: (i) the product of (A) each then remaining  Stipulated
Loss Value,  including the Stipulated Loss Value on such  Determination Date but
excluding the last Stipulated Loss Value of Schedule IV to the Lease,  and (B) a
rate (applied on a simple monthly  basis) equal to the Discount Rate;  (ii) from
the day  one  calendar  month  after  such  Determination  Date  for  each  such
Stipulated  Loss Value;  at (iii) a discount rate  (applied on a simple  monthly
basis) equal to the Breakage  Treasury  Yield,  all in accordance  with accepted
financial practice.

                  "Disqualified  Stock" shall mean any Capital Stock of a Person
or any Restricted Subsidiary of such Person which, by its terms (or by the terms
of any security into which it is convertible  or for which it is  exchangeable),
or upon the  happening  of any  event,  matures  or is  mandatorily  redeemable,
pursuant to a sinking fund  obligation  or  otherwise,  or is  redeemable at the
option of the holder thereof, in whole or in part, on or prior to the end of the
Basic Term.

                  "Drawing Amount" shall mean for any period of time the "Stated
Amount"  for such  period  as set  forth on  Exhibit  B to the form of Letter of
Credit attached as Exhibit M to the Participation Agreement, as such amounts may
be  adjusted  from time to time  pursuant  to Article  III of the  Participation
Agreement.

                  "Drawing  Event"  shall have the meaning  specified in Section
6.1(i)(ii) of the Participation Agreement.

                  "Easement"  shall mean,  collectively,  the easements  granted
under the Access Easement Agreement between NACC and Owner Trustee substantially
in the form of Exhibit P-2 to the Participation Agreement.

                  "Easement  Site" shall mean the real property which is covered
by the Easement.


                                       12

<PAGE>





                  "Eligible  Bank" shall mean the New York main office or branch
of a banking, financial or other similar institution as selected by NACC that is
either (i) the letter of credit issuing bank under the Debt instruments relating
to the Working  Capital  Facilities  of HCNA or (ii) (A) is formed or  organized
under the laws of the  United  States,  (B) is  capable  of  issuing a Letter of
Credit, and (C)(1) the senior unsecured debt obligations (or long-term deposits)
of which  are rated by at least one  Rating  Agency  and are rated at least A by
Standard & Poor's,  at least A2 by  Moody's  or such  other  rating by any other
Rating Agency as is acceptable to Owner  Participant  in the ordinary  course of
its  business,   or  (2)  that  is  otherwise  reasonably  acceptable  to  Owner
Participant  as a letter  of  credit  issuing  bank in the  ordinary  course  of
business of the Owner Participant.

                  "Engineering  Consultant"  shall  mean  Parsons  Power  or any
subsequent  nationally-recognized  independent  engineering consultant expert in
power generation  facilities that is appointed by the Owner Participant with the
prior written consent of NACC, which consent shall not be unreasonably withheld.

                  "Environmental  Claims" shall mean any and all administrative,
regulatory or judicial actions, suits, obligations,  restrictions (including any
restrictions  on ownership,  occupancy,  transferability  or use),  liabilities,
losses, proceedings, decrees, judgments, penalties, fees, fines, demand letters,
Orders,  directives,  claims (including any claims involving  liability in tort,
strict, absolute or otherwise), liens, notices of noncompliance or violation, or
claims for legal fees or costs of  investigations  or  proceedings  (hereinafter
"Claims"),  relating to any  Environmental  Law or any Approval issued under any
Environmental  Law, or arising from the actual or alleged presence or Release of
any Hazardous Material,  including,  without  limitation,  and regardless of the
merit of such Claim,  any and all Claims for enforcement,  mitigation,  cleanup,
removal,  response,  remediation  or other  actions  or  damages,  contribution,
indemnification, cost recovery, compensation or injunctive or declaratory relief
pursuant  to any  Environmental  Law or  alleged  injury  or threat of injury to
property, health, safety, natural resources or the environment.

                  "Environmental   Consultant"   shall  mean  Eder   Associates,
Geomatrix   Consultants,   Inc.,  or  any  other  environmental   consultant  or
consultants.

                  "Environmental Laws" shall mean any Applicable Law relating to
pollution or the  regulation  or protection  of human  health,  safety,  natural
resources  or the  environment  (including,  without  limitation,  ambient  air,
surface  water,   groundwater,   land  surface  or  subsurface  strata,  natural
resources,   aquatic  species,  vegetation  or  wetlands),   including,  without
limitation, laws and regulations (and all other items recited above) relating to
any Release of Hazardous  Materials,  or otherwise  relating to the manufacture,
processing, distribution,  recordkeeping,  reporting, notification,  disclosure,
use, treatment, storage, disposal, management,  generation, recycling, transport
or  handling  of or  exposure  to  Hazardous  Materials.  Without  limiting  the
generality of the foregoing, Environmental Laws include, but are not limited to,
the Comprehensive  Environmental  Response,  Compensation,  and Liability Act of
1980, 42 U.S.C. ss.ss.


                                       13

<PAGE>



9601 et seq.; the Solid Waste Disposal Act, 42 U.S.C.  ss.ss.  6901 et seq.; the
Emergency  Planning and Community  Right-to-Know  Act of 1986, 42 U.S.C.  ss.ss.
11001 et seq.; the Toxic Substances Control Act, 15 U.S.C.  ss.ss. 2601 et seq.;
the Federal Water  Pollution  Control Act, 33 U.S.C.  ss.ss.  1251 et seq.;  the
Hazardous Materials Transportation Act, 49 U.S.C. ss.ss. 1801 et seq.; the Clean
Air Act, 42 U.S.C.  ss.ss.  7401 et seq.; the Safe Drinking Water Act, 42 U.S.C.
ss.ss. 300f et seq.; the Occupational  Safety and Health Act of 1970, 29 U.S. C.
ss.ss.  651 et seq.; the Federal  Insecticide,  Fungicide and Rodenticide Act, 7
U.S.C. ss.ss. 136 et seq.; and the Endangered Species Act, 16 U.S.C. ss.ss. 1531
et seq., each as amended and their state and local counterparts or equivalents.

                  "Environmental  Report"  shall have the meaning  specified  in
Section 10(b) of the Lease.

                  "ERISA" shall mean the Employee Retirement Income Security Act
of 1974, as amended.

                  "ERISA  Affiliate"  shall  mean  each  entity  required  to be
aggregated with the Lessee pursuant to the requirements of Section 414(b) or (c)
of the Code.

                  "Event of Default" shall have the meaning specified in Section
17 of the Lease.

                  "Event  of  Loss"  shall  mean  the  occurrence  of any of the
following  events at any time:  (a) the Facility or the Complex  shall be either
destroyed or damaged  beyond  economic  repair (as evidenced by a certificate of
the chief financial officer of NACC) or any other event shall occur that results
in an insurance  settlement on a basis of a total loss, or a constructive  total
loss,  of the  Facility  or the  Complex,  as the  case may be;  (b) the  entire
Facility,  Site or  Complex  or any  substantial  and  essential  portion of the
Facility,  Site or Complex  shall have been  condemned,  confiscated,  or seized
(except  that if  Lessee  is  contesting  the  validity  of  such  condemnation,
confiscation or seizure by a Permitted Contest, such condemnation,  confiscation
or seizure  shall not  constitute an "Event of Loss" during the pendency of such
Permitted Contest (but not to exceed 180 days)) or shall have been requisitioned
for use for a period of one  hundred  eighty  (180)  days or for a period  which
extends  beyond the  scheduled  expiration of the Basic Term or any Renewal Term
then in  effect;  (c)  there  shall be a  requisition  or taking of title to the
entire Facility, Site or Complex or any substantial and essential portion of the
Facility,  Site or Complex  (except that if Lessee is contesting the validity of
such requisition or taking of title by a Permitted Contest,  such requisition or
taking of title shall not  constitute  an "Event of Loss" during the pendency of
such Permitted Contest (but not to exceed 180 days)); (d) the Facility,  Site or
the Complex shall have been  abandoned;  or (e) NACC shall have failed to convey
to the  Lessor  good,  marketable  (to the  extent  the  same  constitutes  real
property) and  indefeasible  title to the Undivided  Interest in the Facility or
good and marketable  title to the Leasehold  Estate or good and marketable title
to the Easement or the rights purported to be conveyed  pursuant to the Easement
and the  License  and any such  failure  would be  reasonably  likely  to have a
Material Adverse Effect.



                                       14

<PAGE>



                  "Event of Loss  Date"  shall  mean (a) with  respect  to loss,
destruction, damage, requisition of title or abandonment, the date of such event
of loss,  (b) with respect to a  requisition  of use, on the earlier to occur of
the 180th day following the  requisition of use or the last day, as the case may
be, of the Basic Term or any Renewal Term then in effect or (c) in the case of a
failure of NACC to convey title, the date the Lessor so advises NACC.

                  "Event  of  Loss  Purchase   Price"  shall  have  the  meaning
specified in Section 13(b) of the Lease.

                  "Expense" and "Expenses"  shall have the  respective  meanings
specified in Section 7.1 of the Participation Agreement.

                  "Facility"   shall  mean  the  Argus  Utility  Plant  as  more
particularly described in Schedule I to the Lease.

                  "Facility  Cost" shall mean the  product of (a) the  Undivided
Interest multiplied by (b) $75,000,000.

                  "Facility Documents" shall mean the Coal Supply Agreement, the
Coal Transportation  Agreement,  the Gas Supply Agreement and the Power Purchase
Agreements.

                  "Fair Market  Renewal Term" shall mean a period  commencing at
the end of a Renewal  Term and  ending on the date  chosen by NACC  pursuant  to
Section 22 of the Lease,  during which the Undivided Interest in the Facility is
leased for Fair Market Rental Value,  or such shorter  period as may result from
earlier termination of the Lease.

                  "Fair  Market  Rental  Value"  shall mean,  with respect to an
Undivided  Interest in the Facility,  the product of (x) the Undivided  Interest
multiplied  by (y) the rent which would be obtained in arriving at a fair market
rental value for the Facility unencumbered by the Lease for the applicable lease
term in an  arm's-length  transaction  for cash  between an informed and willing
lessee and an informed and willing lessor (in either case under no compulsion to
lease  and  neither  of  whom  is  related  to  the  Owner  Trustee,  the  Owner
Participant,  NACC or HCNA) on an "as is" "where is" basis  except that any such
determination  of fair market  rental value of the Facility  shall be determined
applying  methodology and otherwise on a basis consistent with the Appraisal and
on the basis that (i) (except in the case of determinations  pursuant to Section
18 of the Lease) the Facility has been  maintained in accordance  with the terms
of the  Lease  and (ii) the  lessee  will have  substantially  the same  rights,
interests and  obligations  with respect to the Site as the Lessor has under the
Site Lease,  the Easement and the License and for the then remaining term of the
Site Lease and under the  Services  Agreement;  provided,  that  there  shall be
excluded from the calculation thereof the value of any Severable Modification to
which the  Lessor  does not have  title.  With  respect  to any other  property,
including an Undivided  Interest in the Site,  "Fair Market  Rental Value" shall
mean the value,  which  shall not in any event be less than zero,  that would be
obtained for the use of such property in an  arm's-length  transaction  for cash
between an informed  and  willing  lessee and an  informed  and willing  lessor,
neither of


                                       15

<PAGE>



whom is under any  compulsion  to lease and  neither  of whom is  related to the
Owner Trustee, the Owner Participant, NACC or HCNA.

                  "Fair  Market  Sales  Value"  shall mean,  with  respect to an
Undivided  Interest in the Facility,  the product of (x) the Undivided  Interest
multiplied  by (y) the fair market sales value of the Facility  unencumbered  by
the Lease  which  would be arrived at in an  arm's-length  transaction  for cash
between an informed and willing buyer and an informed and willing  seller (under
no  compulsion,  respectively,  to buy or sell and neither of whom is related to
the Owner Trustee, the Owner Participant, NACC or HCNA) on an "as is" "where is"
basis  except that any such  determination  of fair  market  sales value for the
Facility  shall be  determined  applying  methodology  and  otherwise on a basis
consistent  with the  Appraisal and on the basis that (i) (except in the case of
determinations  pursuant  to  Section 18 of the  Lease)  the  Facility  has been
maintained  in  accordance  with the terms of the Lease and (ii) the buyer  will
have  substantially  the same rights,  interests and obligations with respect to
the Site as the Lessor has under the Site Lease,  the  Easement  and the License
and for the then  remaining  term of the  Site  Lease  and  under  the  Services
Agreement;  provided,  that there shall be excluded from calculation thereof the
value of any  Severable  Modification  to which the Lessor  does not have title;
provided,  further, that for purposes of Section 10(c) of the Lease, Fair Market
Sales Value shall be  calculated  net of  estimated  dismantlement,  removal and
transportation  costs of the Facility or the salvageable  portions thereof as of
the time the Lessee would  otherwise  have had to dismantle,  remove and deliver
the same in  accordance  with such  Section  10(c).  With  respect  to any other
property,  including any  Severable  Modification  made  available to the Lessor
pursuant to Section 7(h) of the Lease,  "Fair Market Sales Value" shall mean the
value,  which  shall not in any event be less than zero,  that would be obtained
for the  ownership  of such  property in an  arm's-length  transaction  for cash
between an informed and willing  purchaser  and an informed and willing  seller,
neither of whom is under any  compulsion to purchase or sell and neither of whom
is related to the Owner Trustee, the Owner Participant, NACC or HCNA.

                  "Federal Power Act" or "FPA" shall mean the Federal Power Act,
as amended from time to time, or any comparable successor Federal statute.

                  "FERC" shall mean the Federal Energy Regulatory  Commission of
the United States of America or any successor agency.

                  "Fixed Charge  Coverage  Ratio" for any period with respect to
any Person, shall mean the ratio of:

                  (a) the sum of (i) Consolidated  EBITDA for such period,  (ii)
         amounts due under Capital Lease Obligations for such period,  and (iii)
         without  duplication of amounts  included in the preceding clause (ii),
         the  aggregate  amount  required to be paid by NACC in respect of Basic
         Rent during such  period,  other than any amount  otherwise  includable
         therein in respect of Interim Rent for such period,

         to


                                       16

<PAGE>




                  (b) the sum of

                           (i)   Consolidated Cash  Interest  Expense  for  such
                  period,  other than any amount otherwise includable therein in
                  respect of Interim Rent;

                           (ii)  the  sum  of  (A)  the   amount  of   regularly
                  scheduled  principal payments with respect to Debt of the type
                  described in clause (a), (b) or (e) of the definition  thereof
                  (other  than  Capital  Lease  Obligations  outstanding  on the
                  Closing Date and those under the Operative Documents) required
                  to be made  by such  Person  and its  Restricted  Subsidiaries
                  during such period and (B) the amount of  regularly  scheduled
                  principal  payments  during such period with respect to direct
                  or indirect Guarantees (as guarantor, obligor or otherwise) of
                  Debt  Incurred by Persons other than such Person or any of its
                  Restricted Subsidiaries,  but only to the extent that payments
                  are  required  to be  made  by  such  Person  or  any  of  its
                  Restricted Subsidiaries under such Guarantees,  other than (1)
                  any such  principal  payments  that are  refinanced,  renewed,
                  refunded  or  replaced  with other  Debt  during  such  period
                  (provided, however, that the amount of any regularly scheduled
                  principal  payments  during such  period with  respect to Debt
                  Incurred  in  connection  with  such   refinancing,   renewal,
                  refunding or  replacement  shall be included under this clause
                  (ii)),  and (2)  principal  payments  during such period under
                  Working  Capital  Facilities  of  such  Person  or  any of its
                  Restricted Subsidiaries; and

                           (iii) without  duplication  of  amounts  included  in
                  clause (i) or (ii)  above,  the sum of (A)  amounts  due under
                  Capital  Lease  Obligations  for such period,  and (B) without
                  duplication of amounts  included in the preceding  clause (A),
                  the aggregate amount required to be paid by NACC in respect of
                  Basic Rent during such period, other than any amount otherwise
                  includable therein in respect of Interim Rent.

                  "Fixed Rate Renewal  Term" shall mean a period  commencing  at
the end of the Basic  Term and  ending on the date  chosen by NACC  pursuant  to
Section 22 of the Lease, during which the Undivided Interest in the Facility may
be leased for the rent  specified in clause (i) of Section 20(b) of the Lease or
such shorter period as may result from early termination of the Lease.

                  "Gas Supply  Agreement"  shall mean the Gas Supply  Agreement,
effective as of  September 1, 1994,  by and between  Chevron  U.S.A.  Production
Company, a division Chevron U.S.A. Inc., and NACC.

                  "Generally  Accepted  Accounting  Principles"  means generally
accepted  accounting  principles  in the  United  States of America in effect on
March 30, 1996.



                                       17

<PAGE>



                  "Gross  Margin"  shall  mean  the  average  price  per ton for
highway deicing salt of HCNA and its Restricted  Subsidiaries  minus the average
distribution  and production costs (before  allocated  depreciation) of HCNA and
its Restricted  Subsidiaries  per ton of highway  deicing salt, in each case for
the  applicable  fiscal year of HCNA,  determined in accordance  with  Generally
Accepted Accounting Principles.

                  "Guarantee"   by  any  Person   shall  mean  any   obligation,
contingent  or  otherwise,  of such  Person  guaranteeing  any Debt of any other
Person (the "primary  obligor") in any manner,  whether  directly or indirectly,
and  including,  without  limitation,  any  obligation  of such  Person,  (i) to
purchase or pay (or advance or supply funds for the purchase or payment of) such
Debt or to  purchase  (or to advance or supply  funds for the  purchase  of) any
security for the payment of such Debt, (ii) to purchase property,  securities or
services  for the purpose of assuring  the holder of such Debt of the payment of
such  Debt,  or (iii) to  maintain  working  capital,  equity  capital  or other
financial  statement  condition  or  liquidity  of the primary  obligor so as to
enable the primary  obligor to pay such Debt (and  "Guaranteed",  "Guaranteeing"
and "Guarantor" shall have the meanings correlative to the foregoing); provided,
however, that the Guarantee by any Person shall not include endorsements by such
Person for  collection  or deposit,  in either case,  in the ordinary  course of
business.

                  "Hazardous Material" shall mean (a) any petroleum or petroleum
product  (including crude oil or any fraction thereof),  explosive,  radioactive
material,   asbestos,   urea  formaldehyde   foam  insulation,   polychlorinated
biphenyls,  lead and radon gas; (b) any chemical,  material,  gas,  substance or
waste  which  is  defined  as  or  included  in  the  definition  of  "hazardous
substance,"   "hazardous  waste,"  "hazardous  material,"  "extremely  hazardous
substance,"   "hazardous   chemical,"  "toxic   substance,"   "toxic  chemical,"
"contaminant" or "pollutant" or words of similar import under any  Environmental
Law; and (c) any other chemical,  material, gas, substance or waste, exposure to
which,  or the  presence,  use,  generation,  treatment,  Release,  transport or
storage of which, is prohibited,  limited or regulated  under any  Environmental
Law.

                  "HCG"  shall mean  Harris  Chemical  Group,  Inc.,  a Delaware
corporation.

                  "HCNA"  shall mean Harris  Chemical  North  America,  Inc.,  a
Delaware corporation, together with its successors and permitted assigns.

                  "HCNA Guaranty" shall mean the Guaranty  substantially  in the
form of Exhibit K to the Participation Agreement,  dated as of the Closing Date,
from HCNA in favor of Owner Participant and Owner Trustee.

                  "HCNA Guaranty  Termination Date" shall mean the date on which
the Guaranteed Obligations have been paid and discharged in full.

                  "HCNA Letter" shall mean the letter  substantially in the form
of  Exhibit  X-1,  dated as of the  Closing  Date,  from  HCNA in favor of Owner
Participant  acknowledging  the adequacy of  consideration  supporting  the HCNA
Guaranty.


                                       18

<PAGE>




                  "HCNA Successor  Company" shall have the meaning  specified in
Section 6.2(h) of the Participation Agreement.

                  "Host  Facilities"  shall mean the plant commonly known as the
"Argus Plant" located in the Complex that processes  brine for the production of
soda ash.

                  "Incur"  shall  mean,  with  respect  to  any  Debt  or  other
obligation of any Person, to create,  issue,  incur (by conversion,  exchange or
otherwise), assume, Guarantee or otherwise become liable in respect of such Debt
or other obligation or the recording, as required pursuant to Generally Accepted
Accounting Principles or otherwise,  of any such Debt or other obligation on the
balance sheet of such Person (and  "Incurrence",  "Incurred",  "Incurrable"  and
"Incurring"  shall  have  meanings  correlative  to  the  foregoing);  provided,
however,  that a change in Generally Accepted Accounting Principles that results
in an obligation of such Person that exists at such time becoming Debt shall not
be deemed an Incurrence of such Debt.

                  "Indemnitee" shall mean Trust Estate, Owner Participant, Power
Contract  Trustee,   Trust  Company  and  Owner  Trustee  and  their  respective
Affiliates, officers, directors, servants and agents.

                  "Information   Memorandum"   shall   mean   the   Confidential
Investment Summary for the Argus Utility Plant Sale/Leaseback  Financing,  dated
January 1996, relating to the financing of the Facility.

                  "Interest  Coverage  Ratio" for any period with respect to any
Person, shall mean:

                  (a) for  purposes  of  Section  6.2(d)  of  the  Participation
         Agreement,  the ratio of (i)  Consolidated  EBITDA  to (ii) the  amount
         equal to Consolidated Interest Expense for such period; and

                  (b) for  purposes  of  Sections  6.1(a)(iv)  and 6.2(h) of the
         Participation  Agreement,  the ratio of (i) Consolidated EBITDA to (ii)
         the amount equal to Consolidated  Interest Expense,  in each case, on a
         pro forma basis,  for the four  consecutive  fiscal  quarters for which
         quarterly or annual  financial  statements  are  available  immediately
         prior to the Transaction Date; provided,  that in the event such Person
         or  its  Restricted   Subsidiaries  have  made  Asset  Dispositions  or
         acquisitions   of  assets  not  in  the  ordinary  course  of  business
         (including  acquisitions of other Persons by merger,  consolidation  or
         purchase of Capital Stock) during or after such period or in connection
         with the  transaction  giving rise to the  calculation  of the Interest
         Coverage Ratio,  such computation shall be made on a pro forma basis as
         if the Asset  Dispositions or acquisitions and the related  application
         of  proceeds  or  financings  had taken  place on the first day of such
         period.

                  "Interest  Rate  or  Currency  Protection  Agreements"  of any
Person shall mean any interest rate swap agreement, interest rate cap agreement,
currency swap agreement or other


                                       19

<PAGE>



financial  agreement  or  arrangement  designed  to protect  such  Person or any
Restricted  Subsidiary of such Person against  fluctuations in interest rates or
currency  exchange rates and which shall have a notional  amount no greater than
the payments due with respect to Debt being hedged thereby.

                  "Interim Rent" shall mean the rent for the Interim Term.

                  "Interim  Term" shall have the meaning  specified in Section 3
of the Lease.

                  "Investment"  by any Person  shall mean any direct or indirect
loan, advance or other extension of credit or capital  contribution to (by means
of  transfers  of cash or other  property to others or payments  for property or
services  for the  account or use of  others,  or  otherwise),  or  purchase  or
acquisition of Capital Stock,  bonds,  notes,  debentures or other securities or
evidence of Debt issued by any other Person.

                  "Issuing  Bank"  shall  mean an  Eligible  Bank that  issues a
Letter of Credit.

                  "Lease" or  "Facility  Lease"  shall mean the  Facility  Lease
substantially in the form of Exhibit B to the Participation Agreement,  dated as
of the  Closing  Date,  between  Lessor  and NACC,  as the same may be  amended,
modified or  supplemented  from time to time in accordance  with the  provisions
thereof.

                  "Lease  Financing  Documents"  shall  mean  the  Participation
Agreement,  the Lease, the Site Lease, the Easement, the License, the Memorandum
of Lease,  the  Memorandum of Site Lease (Parcel  A-1),  the  Memorandum of Site
Lease (Parcel B-1),  the Trust  Agreement,  the Argus Utility Bill of Sale,  the
Argus  Utility  Deed of  Improvements,  the Tax  Indemnity  Agreement,  the HCNA
Guaranty,  the Letter of Credit,  the Power Contract Trust Agreement,  the Power
Contract Assignment,  the Services Agreement, the Account Bank Agreement and the
Lessor Security Agreement.

                  "Leasehold Estate" shall have the meaning specified in Section
2(a) of the Site Lease.

                  "Lease Term" shall mean the full term of this Lease, including
the Interim Term, the Basic Term and any applicable Renewal Term.

                  "Lease  Termination Date" shall mean the last day of the Lease
Term whether  occurring by reason of the scheduled  expiration of the Lease Term
or upon earlier termination of the Lease pursuant to the terms thereof.

                  "Legal  Requirement"  shall mean any requirement or obligation
imposed by or under any  Applicable  Law,  including,  without  limitation,  any
Environmental Law.



                                       20

<PAGE>



                  "Lessee  Regulatory  Event of Loss"  shall  mean a  Regulatory
Event of Loss  caused by the  action,  inaction  or status  (unless  caused by a
change in Legal Requirements) of NACC or any Affiliate thereof.

                  "Lessor"  shall  mean Owner  Trustee  and its  successors  and
permitted assigns.

                  "Lessor Liens" shall mean Liens on or against the Facility (or
the Undivided Interest  therein),  the Site (or the Undivided Interest therein),
the Lease,  the Power  Purchase  Agreements,  the Trust Estate or any payment of
Rent (a) which  result  from any act of, any  failure to act by, or any claim or
Expense against,  Owner Trustee, Trust Company or Owner Participant unrelated to
its interest in the Trust Estate,  the Facility or the Site,  the Power Purchase
Agreements,   the  administration  of  the  Trust  Estate  or  the  transactions
contemplated by the Participation  Agreement or any other Operative Document, or
which result from any violation by Owner Trustee,  Power Contract Trustee, Trust
Company,  or Owner Participant of any of the terms of the Operative Documents or
(b) which  result from Liens in favor of any taxing  authority  by reason of any
Tax owed by Owner  Trustee,  Trust  Company,  Power  Contract  Trustee  or Owner
Participant,  except that Lessor Liens shall not include any Lien resulting from
any Tax for which NACC is obligated to indemnify any Indemnitee  until such time
as NACC shall have already paid to, or on behalf of, such  Indemnitee the Tax or
an indemnity with respect to the same.

                  "Lessor  Possession  Date"  shall mean the  earlier of the day
after the Lease  Termination  Date and the date of loss of use or  possession of
the  Undivided  Interest in the  Facility by NACC  pursuant to Section 18 of the
Lease.

                  "Lessor Security  Account" shall mean the account in which the
Cash Deposit is held pursuant to the Account Bank Agreement.

                  "Lessor Security  Agreement" shall mean the Security Agreement
substantially in the form of Exhibit Y to the  Participation  Agreement  between
Lessor and Lessee.

                  "Lessor's Contract Rights" shall mean the Lessor's  beneficial
interest in the Power Purchase  Agreements  held by the Power  Contract  Trustee
pursuant to the Power Contract Trust Agreement.

                  "Letter  of  Credit"  shall  mean  one  or  more  irrevocable,
unconditional  standby letters of credit  substantially in the form of Exhibit N
to the Participation  Agreement (i) issued by an Issuing Bank for the benefit of
the Owner Participant,  (ii) having a stated expiration date of not earlier than
one year after the date of original issuance or renewal thereof,  or in the case
of a renewal,  such shorter period,  if the term of the Working Capital Facility
to which  the  Eligible  Bank and NACC are  parties  expires  at the end of such
shorter  period and such  Working  Capital  Facility  has not been  extended  or
renewed, (iii) having an aggregate drawing amount at all times at least equal to
the Drawing Amount, (iv) that may be drawn upon at the office of the


                                       21

<PAGE>



Issuing  Bank in New York City in the  event  that a Drawing  Event  shall  have
occurred and (vi) which are payable in immediately available funds.

                  "License" shall mean, collectively, the licenses granted under
the License Agreement  between NACC and Owner Trustee  substantially in the form
of Exhibit P-3 to the Participation Agreement.

                  "Lien"  shall mean any lien,  mortgage,  encumbrance,  pledge,
charge,  lease, easement or security interest of any kind, including any thereof
arising under conditional sales or other title retention agreements.

                  "Material  Adverse  Effect" shall mean (a) a material  adverse
effect on (i) the Facility, (ii) the business, operations, property or financial
or other  condition of NACC or HCNA and its Restricted  Subsidiaries  taken as a
whole,  (iii) the  validity  or  enforceability  of any of the  Lease  Financing
Documents,  the  Facility  Documents  or any  Approvals  necessary  for the use,
operation  or  maintenance  of the  Facility,  the  Site and the  Easement  Site
pursuant to the Lease Financing Documents or (iv) the rights and remedies of the
Owner  Participant,  OP  Guarantor  or  Owner  Trustee  under  any of the  Lease
Financing  Documents or the Power Purchase  Agreements or (b) the imposition of,
or a material  increase in the risk of imposition of, any criminal  liability on
the Owner Participant, OP Guarantor or Owner Trustee.

                  "Material  Default"  shall mean an event or  condition  which,
with  notice or lapse of time or both,  would  become an Event of Default of the
type described in Section 17 (a), (b) or (g) of the Lease.

                  "Material  Event of  Default"  shall  mean an Event of Default
described in Sections  17(a),  (b),  (f),  (g), (h), (i), (k), (l) or (m) of the
Lease.

                  "Memorandum  of  Lease"  shall  mean the  Memorandum  of Lease
substantially in the form of Exhibit O to the Participation Agreement,  dated as
of the Closing Date, between Lessor and NACC.

                  "Memorandum  of  Site  Lease  (Parcel  A-1)"  shall  mean  the
Memorandum of Site Lease (Parcel A-1)  substantially in the form of Exhibit P to
the  Participation  Agreement,  dated as of the Closing  Date,  between NACC and
Lessor.

                  "Memorandum  of  Site  Lease  (Parcel  B-1)"  shall  mean  the
Memorandum of Site Lease (Parcel B-1)  substantially  in the form of Exhibit P-1
to the Participation  Agreement,  dated as of the Closing Date, between NACC and
Lessor.

                  "Merger" shall have the meaning specified in Section 6.1(a) of
the Participation Agreement.

                  "Modifications"  shall have the meaning  specified  in Section
7(f) of the Lease.


                                       22

<PAGE>




                  "Moody's" shall mean Moody's  Investors  Service,  Inc. or its
successor in interest.

                  "NACC" shall mean North American Chemical Company,  a Delaware
corporation, together with its successors and permitted assigns under the Lease.

                  "NACC Successor  Company" shall have the meaning  specified in
Section 6.1(a)(iv) of the Participation Agreement.

                  "Net  Available  Proceeds"  from any Asset  Disposition by any
Person  shall  mean  cash  and  readily  marketable  Cash  Equivalents  received
(including by way of sale or  discounting  of a note,  instalment  receivable or
other receivable,  but excluding any other consideration received in the form of
assumption  by the  acquiree  of  Debt or  other  obligations  relating  to such
properties or assets) and the fair market value of all other  property  received
therefrom  by such  Person,  net of (a)  all  legal,  title  and  recording  tax
expenses,  commissions  and other fees and  expenses  incurred  and all federal,
state, provincial, foreign and local taxes required to be accrued as a liability
as a consequence of such Asset Disposition, (b) all payments made by such Person
or its  Restricted  Subsidiaries  on any Debt which is secured by such assets in
accordance  with the terms of any Lien upon or with  respect  to such  assets or
which must by the terms of such Lien, or in order to obtain a necessary  consent
from holders of secured Debt to such Asset  Disposition  or by applicable law be
repaid  out  of  the  proceeds  from  such  Asset   Disposition,   and  (c)  all
distributions and other payments made to minority interest holders in Restricted
Subsidiaries  of such  Person  or  joint  ventures  as a  result  of such  Asset
Disposition.

                  "Net Economic Return" shall mean the anticipated net after-tax
yield  (calculated  using  the  multiple   investment  sinking  fund  method  of
analysis),  and the anticipated  aggregate  income  (computed in accordance with
Financial  Accounting  Standard  No. 13, as amended and in effect on the Closing
Date) and after-tax cash flow of Owner Participant,  all calculated on the basis
of the Pricing Assumptions,  the Tax Assumptions, and the methods of calculation
used as of the Closing Date by the Owner  Participant in calculating  Basic Rent
and Stipulated Loss Values.

                  "Nonseverable  Modification"  shall mean any Modification that
is not a Severable Modification.

                  "Officer's  Certificate"  of  any  corporation  shall  mean  a
certificate of the Chairman, the President,  any Vice President,  the Treasurer,
the  Secretary  or any  authorized  representative  of such  corporation,  which
certificate shall state that such officer has made such investigation and review
as such officer shall deem necessary to make the statements contained therein.

                  "Operative   Documents"   shall   mean  the  Lease   Financing
Documents, the Facility Documents and all Approvals.

                  "Operator" shall mean NACC or such other Person  designated by
the Owner  Participant as being  responsible  for the operation of the Facility,
such Person being NACC, its


                                       23

<PAGE>



successors  and  assigns,  until  it  resigns  or is  removed  pursuant  to  the
provisions of the Services Agreement.

                  "OP Regulatory Event of Loss" shall mean a Regulatory Event of
Loss caused by the action (including, without limitation, a transfer pursuant to
Section 6.4 of the Participation  Agreement),  inaction or status (unless caused
by a change in Legal  Requirements) of the Lessor,  the Owner  Participant or an
Affiliate thereof unrelated to Lessor's or Owner Participant's  participation in
the lease  financing  of the  Facility  and the related  transactions  under the
Operative Documents.

                  "Order"  shall mean and include any order,  writ,  injunction,
decree, judgment, award, determination, direction or demand.

                  "Other  Lease" shall mean the  document  that is defined to be
the Lease in the Other Participation Agreement.

                  "Other Lessor" shall mean the Other Owner Trustee.

                  "Other Operative  Documents" shall mean the documents that are
defined to be the Operative Documents in the Other Participation Agreement.

                  "Other  Owner  Participant"  shall  mean  the  person  that is
defined to be the "Owner Participant" in the Other Participation Agreement.

                  "Other Owner Trustee" shall mean the Person that is defined to
be the "Owner Trustee" in the Other Participation Agreement.

                  "Other  Participation  Agreement" shall mean the Participation
Agreement  (Searles  Valley Trust 1996) dated as of the Closing Date among NACC,
HCNA, Other Owner Trustee,  Other Owner  Participant,  and OP Guarantor,  as the
same may be modified,  amended or supplemented from time to time pursuant to the
applicable provisions thereof.

                  "Other Regulatory Event of Loss" shall mean a Regulatory Event
of Loss (other than a Lessee  Regulatory Event of Loss or an OP Regulatory Event
of Loss), including any such Regulatory Event of Loss resulting from a change in
Legal Requirements.

                  "Other Site Lease" shall mean the document  that is defined to
be the Site Lease in the Other Participation Agreement.

                  "Other Tenant" shall mean the Other Owner Trustee.

                  "Overdue  Interest  Rate"  shall  mean the  lesser  of (i) the
maximum  lawful rate and (ii) the Prime Rate plus 2% per annum  (computed on the
basis of a 360-day year of twelve 30-day months).


                                       24

<PAGE>




                  "Owned Facilities" shall have the meaning specified in Section
2(d) of the Site Lease.

                  "Owner"  shall  mean  any  Person  that  owns,  at the time in
question, an undivided interest in the Facility.

                  "Owner Participant" shall mean [Owner Participant], a New York
corporation, and its successors and permitted assigns pursuant the Participation
Agreement.

                  "Owner  Trustee"  shall  mean the  Trust  Company,  not in its
individual capacity, but solely as trustee under the Trust Agreement, until such
time as its successor  shall have become such pursuant to the  provisions of the
Trust  Agreement,  and  thereafter  the term  "Owner  Trustee"  shall  mean such
successor.

                  "Owner Trustee  Documents" shall have the meaning specified in
Section 2.1 of the Trust Agreement.

                  "Parcel  Map"  shall  have the  meaning  specified  in Section
4.1(j) of the Participation Agreement.

                  "Parent  Company" of HCNA shall mean any other  Person  owning
80% or more of the outstanding Voting Stock of HCNA.

                  "Participation   Agreement"   shall  mean  the   Participation
Agreement  (Searles  Valley Trust 1996) dated as of July 15,  1996,  among NACC,
HCNA, Trust Company, not in its individual capacity except as expressly provided
therein, but solely as trustee under the Trust Agreement, Owner Participant,  as
the  same  may be  amended,  modified  or  supplemented  from  time  to  time in
accordance with the provisions thereof.

                  "Parts"  shall  mean  all   appliances,   components,   parts,
additions, instruments, appurtenances,  accessories, furnishings, accessions and
other  equipment of whatever  nature (or any part thereof),  including,  without
limitation,  restorations  thereof and substitutions and replacements  therefor,
that may from time to time  constitute or become a part of or be incorporated in
or attached to the Facility.

                  "PBGC" shall mean the Pension Benefit  Guarantee  Corporation,
or any successor thereto under ERISA.

                  "PCBs" shall have the meaning specified in Section 5.1(u)(vii)
of the Participation Agreement.

                  "Pension  Plan"  shall have the meaning  specified  in Section
3(2) of ERISA.


                                       25

<PAGE>



                  "Permitted  Contest"  shall mean (x) actions taken by a Person
to  contest in good  faith,  by  appropriate  proceedings  initiated  timely and
diligently prosecuted,  the legality,  validity or applicability to the Facility
(or the  Undivided  Interest  therein)  or the Site (or the  Undivided  Interest
therein)  or any  interest  in  either  thereof  or any  Person of (i) any Legal
Requirement,  or (ii) any  Lien,  or (y) any  valid  nonconforming  use  permit,
waiver,  extension  or  forbearance  excusing  or  exempting  such  Person  from
Applicable  Law or Legal  Requirements  and such  Person  shall be making a good
faith effort and shall be diligently taking all appropriate and reasonable steps
to extend  any such  valid  nonconforming  use,  permit,  waiver,  extension  or
forbearance for the maximum period available with respect to such Applicable Law
or Legal  Requirements  (but not longer  than the end of the Site  Lease  Term);
provided,   that  the  initiation  and  prosecution  of  such  contest  or  such
non-compliance would not (i) materially and adversely affect the right, title or
interest of NACC,  Owner  Participant or Owner Trustee in or to the Facility (or
the Undivided Interest  therein),  the Site (or the Undivided Interest therein),
the  Easement  Site or any  interest in either  thereof,  (ii) affect the value,
utility or remaining  useful life of the Facility or any interest therein or the
continued economic operation thereof,  except to an insignificant  extent, (iii)
create a danger of criminal  liability  being  imposed on Owner  Trustee,  Trust
Company or Owner Participant or any related Indemnitee,  (iv) create a danger of
material civil liability being imposed on Owner Trustee,  Trust Company or Owner
Participant  that is not  indemnified  against  pursuant  to Section  7.1 of the
Participation Agreement, (v) such contest or non-compliance could not reasonably
be expected to have an adverse  effect on the ability of NACC to comply with the
provisions of and perform its obligations under the Lease or any other Operative
Document,  and  (vi)  such  contest  will not  result  in the  extension  of the
imposition of such Legal  Requirement  beyond the date which is six months prior
to (x) the end of the  then-current  Lease Term,  or (y) if the Lessee has given
its  irrevocable  purchase  option notice or renewal  option notice  pursuant to
which it has elected to exercise a renewal option,  or during the course of such
contest it gives such notice,  the end of the Renewal Term with respect to which
the Lessee has given such notice; provided,  further, that in any event adequate
reserves  in  accordance  with  generally  accepted  accounting  principles  are
maintained against any adverse  determination of such contest or the termination
of such permit, waiver, extension or forbearance.  NACC shall provide the Lessor
with notice of any contest or  non-compliance in detail sufficient to enable the
Lessor to ascertain  whether such contest or such  non-compliance is a Permitted
Contest within this definition.

                  "Permitted  Investments"  shall have the meaning  specified in
Section 26 of the Lease.

                  "Permitted  Liens"  shall mean (a) the  respective  rights and
interests  of the  parties  to  the  Operative  Documents,  as  provided  in the
Operative Documents, and if Owner Participant exercises its rights under Section
9.7 of the Participation  Agreement, the interests of all Persons (including any
trustee  acting on behalf of such  Persons)  providing  debt  financing to Owner
Participant  or Owner  Trustee,  (b) Lessor Liens,  (c) Liens for taxes,  water,
sewage,  license,  permit or  inspection  fees either not yet due and payable or
being   contested   pursuant  to  a   Permitted   Contest,   (d)   construction,
materialmen's, mechanics', workers', repairmen's, employees' or other like Liens
arising in the ordinary course of business for amounts either not


                                       26

<PAGE>



overdue for a period of not more than 45 days or being  contested  pursuant to a
Permitted  Contest or bonded for the amount  required  under  Applicable  Law to
release any such Lien of record,  (e) Liens  arising out of  judgments or awards
against  NACC which at the time are subject to a Permitted  Contest,  but in any
event not to exceed  $1,000,000 in the aggregate at any one time unless the full
amount  in  dispute  is  bonded  in a  manner  reasonably  acceptable  to  Owner
Participant,  (f) applicable zoning and building regulations and ordinances from
time to time in effect  which do not affect the use or operation of the Facility
(or the  Undivided  Interest  therein) in the normal  conduct of the business of
NACC except to an insignificant extent or impair the value, utility or remaining
useful life of the Facility (or the Undivided  Interests  therein)  except to an
insignificant  extent; (g) the interest of a sublessee in the Undivided Interest
in the Facility under a permitted sublease; (h) Liens listed on the title policy
delivered  to Owner  Participant  on the  Closing  Date;  (i) Liens,  easements,
encumbrances,  restrictions,  defects  or  irregularity  of  title  that  in the
aggregate are not  substantial  in amount,  do not  materially  detract from the
value of the Facility, the Service Facilities, the Easement Site or the Site (or
the Undivided  Interests  therein) and do not  materially  impair the use of the
Facility, the Service Facilities or the Site (or the Undivided Interest therein)
in the ordinary  course of business;  (j) any Lien,  with respect to any Service
Facility that would not, in the event that the  beneficiary of such Lien were to
exercise its rights thereunder, materially impair the ability of NACC to provide
or cause to be provided the services for which such Service Facility is required
under the Services Agreement;  (k) Liens existing on the Closing Date and listed
on Schedule II to the Participation Agreement; and (l) the respective rights and
interests of the parties to the Other  Operative  Documents,  as provided in the
Other Operative Documents.

                  "Person" shall mean any individual, corporation,  partnership,
joint  venture,   association,   joint-stock  company,  trust,  non-incorporated
organization or government or any agency or political subdivision thereof.

                  "Plan" shall have the meaning  specified in Section 9.7 of the
Participation Agreement.

                  "Power   Contract   Assignment"   shall  mean  the   Agreement
Concerning  Assignment  and  Delegation  of Parallel  Generation  Agreement  and
Interconnection Facilities Agreement (Argus Utility),  substantially in the form
of Exhibit E to the  Participation  Agreement,  dated as of July 12, 1996, among
NACC, Owner Trustee,  Other Owner Trustee,  Power Contract Trustee and the Power
Purchaser.

                  "Power Contract Trust  Agreement" shall mean the Argus Utility
Trust  Agreement  substantially  in the form of  Exhibit D to the  Participation
Agreement,  dated as of July 12, 1996,  among the Power  Contract  Trustee,  the
Owner Trustee and the Other Owner Trustee.

                  "Power  Contract  Trustee"  or "Bank  Trustee"  shall mean the
Trust Company, not in its individual  capacity,  but solely as trustee under the
Power Contract Trust Agreement.



                                       27

<PAGE>



                  "Power  Purchase  Agreements"  shall mean the  "Contracts"  as
defined in the Power Contract Assignment.

                  "Power  Purchaser"  shall  mean  Southern   California  Edison
Company, a California corporation.

                  "Preferred  Stock"  as  applied  to the  Capital  Stock of any
Person shall mean Capital Stock of such Person of any class or classes  (however
designated)  that  ranks  prior,  as to the  payment of  dividends  or as to the
distribution   of  assets  upon  any  voluntary  or   involuntary   liquidation,
dissolution  or winding  up of such  Person,  to shares of Capital  Stock of any
other class of such Person.

                  "Pricing  Assumptions" shall mean the Pricing  Assumptions set
forth on Schedule I to the  Participation  Agreement,  as adjusted  from time to
time in accordance with Section 3.2 of the Participation Agreement.

                  "Prime  Rate"  shall  mean  the  rate of  interest  per  annum
publicly announced from time to time by Citibank, N.A. as its prime rate then in
effect at its principal office in New York City.

                  "Processing   Services   Election"   shall  have  the  meaning
specified in the Services Agreement.

                  "Proposed Tax Law Change" shall mean a Tax Law Change which is
proposed  after April 26, 1996 and on or before the Closing  Date and enacted or
promulgated  after the  Closing  Date by or during a Congress  in session on the
Closing Date.

                  "PURPA" shall mean the Public Utility Regulatory  Policies Act
of 1978, and the regulations of the FERC promulgated thereunder, as amended from
time to time.

                  "Qualifying  Facility"  shall mean a  qualifying  cogeneration
facility or a qualifying small power  production  facility within the meaning of
PURPA.

                  "Rating  Agency" shall mean  Standard & Poor's or Moody's,  or
any other  nationally  recognized  statistical  rating  organization  reasonably
acceptable to Owner Participant in its ordinary course of business.

                  "Regulations"  shall mean the  final,  temporary  or  proposed
regulations promulgated or issued under the Code.

                  "Regulatory  Event of Loss" shall mean the  revocation by FERC
of the  Facility's  status as a  Qualifying  Facility  and,  as a result of such
revocation, the Lessor or the Owner Participant or any Affiliate thereof becomes
regulated as an "electric utility",  "electric  corporation",  "electric utility
company", "public utility" or a "public utility holding company"


                                       28

<PAGE>



or  subject  to  any  other  similar  materially  burdensome  regulation  by any
Authority or under any Legal Requirement.

                  "Regulatory  Purchase Price" shall have the meaning  specified
in Section 13(f)(iii) of the Lease.

                  "Regulatory SLV Payment Date" shall have the meaning specified
in Section 13(f)(iii) of the Lease.

                  "Related  Plants" shall have the meaning  specified in Section
2(d) of the Site Lease.

                  "Release"   shall  mean  the  threatened  or  actual  release,
deposit,  disposal or leakage of any Hazardous  Material at, into, upon or under
any land,  water or air, or otherwise into the environment,  including,  without
limitation,  by means  of  burial,  disposal,  discharge,  emission,  injection,
spillage,  leakage, seepage,  leaching,  dumping,  pumping,  pouring,  escaping,
emptying or placement.

                  "Remaining  Dollar-Years"  shall  mean  with  respect  to  the
calculation of Break Costs on any  Determination  Date,  the amount  obtained by
dividing the sum of each then  remaining  Stipulated  Loss Value,  including the
Stipulated Loss Value for such Determination Date, by twelve (12).

                  "Renewal  Term" shall mean either the Fixed Rate  Renewal Term
or a Fair Market Renewal Term.

                  "Rent"   shall  mean  Basic   Rent  and   Supplemental   Rent,
collectively.

                  "Reorganization"  shall have the meaning  specified in Section
6.1(a) of the Participation Agreement.

                  "Replacement  Parts"  shall  have  the  meaning  specified  in
Section 7(d) of the Lease.

                  "Required  Modification"  shall have the meaning  specified in
Section 7(f) of the Lease.

                  "Responsible  Environmental Manager" shall mean the Manager of
Environmental  Affairs or the Director of Safety,  any of their  successors,  or
others with substantially similar responsibility for environmental or health and
safety compliance for the Facility,  the Site or the Complex,  or any manager or
other employee higher than the Manager of  Environmental  Affairs or Director of
Safety with responsibility for environmental or health and safety compliance for
the Facility, the Site or the Complex.



                                       29

<PAGE>



                  "Responsible   Officer"   shall   mean  in  the  case  of  any
corporation,  the President,  the chief financial officer,  the Treasurer or any
Vice President thereof, and in the case of the Owner Trustee, any officer in its
Corporate Trust Administration.

                  "Restricted  Payment"  has the  meaning  specified  in Section
6.2(e).

                  "Restricted  Subsidiary"  shall  mean  any  Subsidiary  of any
Person other than an Unrestricted Subsidiary.

                  "Restoration" shall have the meaning specified in Section 9(f)
of the Lease.

                  "Salt Commitments" shall mean, with respect to any period, the
aggregate  number of tons of highway deicing salt specified in awarded  customer
bids to HCNA and its Restricted  Subsidiaries or awarded tenders by HCNA and its
Restricted Subsidiaries.

                  "SEC Periodic Reports" shall mean the annual report of HCNA on
Form 10-K for the fiscal year ended March 25, 1995, and the quarterly reports of
HCNA on Form 10-Q for the fiscal  quarters  ended June 24, 1995,  September  23,
1995,  and December 23, 1995,  as each such report is amended and filed with the
Securities and Exchange Commission.

                  "Second  Notice"  shall have the meaning  specified in Section
22(b) of the Lease.

                  "Securities  Act" shall mean the  Securities  Act of 1933,  as
amended and as the same may be further amended.

                  "Semiannual  Lease  Periods"  during the Lease Term shall mean
consecutive  periods in the Lease Term, the first such period  commencing on the
Basic Term Commencement Date and ending on the six-month anniversary thereof and
successive  semiannual  periods  thereafter ending on each subsequent  six-month
anniversary date of the Basic Term Commencement Date.

                  "Semiannual  Rent Payment  Dates"  during the Lease Term shall
mean the Basic Rent payment dates set forth on Schedule III to the Lease.

                  "Senior Note  Indentures"  shall mean the Senior  Secured Note
Indenture and the Senior Subordinated Note Indenture.

                  "Senior  Secured  Note  Indenture"  shall mean the  Indenture,
dated as of October 15,  1993,  among HCNA,  each of the  Subsidiary  Guarantors
named therein, and The Bank of New York, as Trustee, with respect to the 10 1/4%
Senior Secured Discount Notes due July 15, 2001 of HCNA.

                  "Senior Subordinated Note Indenture" shall mean the Indenture,
dated as of October 15,  1993,  among HCNA,  each of the  Subsidiary  Guarantors
named therein, and IBJ


                                       30

<PAGE>



Schroder Bank & Trust  Company,  as Trustee,  with respect to the 10 3/4% Senior
Subordinated Notes due October 15, 2003 of HCNA.

                  "Service Facilities" shall mean the coal handling,  processing
and storage  facilities,  water supply  (potable  and  brackish)  system,  water
cooling  facilities,  fire protection  water  facilities,  waste water discharge
facilities and ash disposal facilities of the Complex required for the operation
of the Facility.

                  "Services   Agreement"  shall  mean  the  Services   Agreement
substantially in the form of Exhibit M to the Participation Agreement,  dated as
of the Closing Date, between Owner Trustee and NACC.

                  "Severable  Modifications"  shall mean any Modifications  that
are removable from the Facility without causing material damage thereto.

                  "Sifto" shall mean Sifto Canada Inc., a corporation  organized
under the laws of the Province of Ontario, Canada.

                  "Sifto Note  Indenture"  shall mean the Indenture  dated as of
October 15, 1993, among Sifto, HCNA, certain Restricted Subsidiaries of HCNA and
Chemical  Bank, as Trustee in respect of Sifto's 8 1/2% Senior Secured Notes due
July 15, 2000.

                  "Sifto  Notes" shall mean the 8 1/2% Senior  Secured Notes due
July 15, 2000 issued by Sifto pursuant to the Sifto Note Indenture.

                  "Site"  shall  mean,  collectively,  the  "Site" as defined in
Section 2(a) of the Site Lease (Parcel A-1) together with the  "Adjoining  Site"
as defined in Section 2(c) of the Site Lease (Parcel B-1); provided,  that after
the effective date of the lot-line adjustment or parcel  resubdivision  referred
to in  Section  6.1(j) of the  Participation  Agreement,  "Site"  shall mean the
"Site" as defined in Section 2(a) of the Site Lease  (Parcel A-1), as amended in
connection with such lot-line adjustment or parcel resubdivision.

                  "Site Lease" shall mean, collectively, Site Lease (Parcel A-1)
and Site Lease (Parcel B-1); provided, that after effective date of the lot-line
adjustment  or  parcel  resubdivision  referred  to in  Section  6.1(j)  of  the
Participation  Agreement,  "Site Lease" shall mean Site Lease  (Parcel  A-1), as
amended in connection with such lot-line adjustment or parcel resubdivision.

                  "Site Lease  (Parcel  A-1)" shall mean the Site Lease  (Parcel
A-1)  substantially in the form of Exhibit C-1 to the  Participation  Agreement,
dated as of the Closing  Date,  between  NACC,  as Site Lessor,  and Lessor,  as
Tenant.

                  "Site Lease  (Parcel  B-1)" shall mean the Site Lease  (Parcel
B-1)  substantially in the form of Exhibit C-2 to the  Participation  Agreement,
dated as of the Closing  Date,  between  NACC,  as Site Lessor,  and Lessor,  as
Tenant.


                                       31

<PAGE>




                  "Site Lease Event of Default" shall have the meaning specified
in Section 7(a) of the Site Lease.

                  "Site Lease Term" shall have the meaning  specified in Section
3 of the Site Lease.

                  "Site Lease Termination Date" shall have the meaning specified
in Section 3 of the Site Lease.

                  "Site Lessor" shall have the meaning  specified in preamble of
the Site Lease.

                  "SLV Payment Date" shall have the meaning specified in Section
13(b) of the Lease.

                  "Soda Ash Consultant"  shall mean British Sulphur  Consultants
or any subsequent soda ash consultant.

                  "Special   Environmental   Expenses"  shall  mean  any  fines,
penalties, liabilities, costs, expenses, payments to claimants or other Persons,
remediation  and other  response costs and capital  expenditures,  in each case,
pursuant to any Environmental Law.

                  "Special   Termination   Event"   shall  mean  (a)  any  Asset
Disposition by NACC or HCNA or any Restricted Subsidiary of NACC or HCNA subject
to Section 6.1(a)(iii) or Section 6.2(g) of the Participation Agreement, (b) any
merger, consolidation, or transfer, conveyance, sale, assignment, lease or other
disposition  of all or  substantially  all the  properties and assets of NACC or
HCNA or any Restricted Subsidiary of NACC or HCNA subject to Section 6.1(a)(iv),
6.1(b)(ii),  6.2(h), 6.3(a)(ii) or 6.3(b)(ii) of the Participation Agreement, or
(c) any transfer,  conveyance,  sale, assignment,  lease or other disposition of
all or substantially  all the properties and assets that comprise the Complex by
NACC  or  any   reorganization   or  other  transaction  or  series  of  related
transactions  as a result of which it ceases to be a  Restricted  Subsidiary  of
HCNA subject to Section 6.1(a)(iv) or 6.1(b)(ii) of the Participation  Agreement
which  requires the consent of Owner Trustee or Owner  Participant in accordance
with the provisions of Sections  6.1(a)(iii),  6.1(a)(iv),  6.1(b)(ii),  6.2(g),
6.2(h), 6.3(a)(ii) or 6.3(b)(ii) of the Participation Agreement, as the case may
be, and which is not  proposed by NACC,  HCNA or any  Restricted  Subsidiary  or
Affiliate  of NACC or HCNA for the purpose of giving  rise to a purchase  option
under Section 6.5 of the Participation Agreement.

                  "Special  Termination  Payment  Date"  shall mean the date for
payment of the Special  Termination Payment Price pursuant to Section 6.5 of the
Participation Agreement.

                  "Special  Termination  Payment  Price"  shall have the meaning
specified in Section 6.5 of the Participation Agreement.

                  "Standard  & Poor's"  shall  mean  Standard  & Poor's  Ratings
Group, a division of McGraw-Hill, Inc., or its successor in interest.


                                       32

<PAGE>




                  "Stipulated  Loss  Value"  shall mean as of any  Determination
Date the amount set forth opposite such Determination Date on Schedule IV to the
Lease.

                  "Sublease"  shall have the meaning  specified in Section 15 of
the Lease.

                  "Subsidiary"  of any Person shall mean (i) a corporation  more
than 50% of the combined voting power of the  outstanding  Voting Stock of which
is  owned,  directly  or  indirectly,  by such  Person  or by one or more  other
Subsidiaries  of such  Person  or by such  Person  and one or more  Subsidiaries
thereof  or (ii) any other  Person  (other  than a  corporation)  in which  such
Person, or one or more other  Subsidiaries of such Person or such Person and one
or more other  Subsidiaries  thereof,  directly  or  indirectly,  has at least a
majority  ownership  and power to direct the  policies,  management  and affairs
thereof.

                  "Supplemental   Rent"   shall   mean  any  and  all   amounts,
indemnities,  liabilities  and other  obligations of any kind,  except for Basic
Rent, which NACC assumes or agrees to pay under the Lease or any other Operative
Document,  including, without limitation,  Stipulated Loss Value and damages for
breach of any covenants,  representations,  warranties or agreements therein, to
Lessor,  Owner  Trustee,  Owner  Participant,  Power  Contract  Trustee or Trust
Company.

                  "Survey"  shall mean the survey,  maps and plats all delivered
pursuant to Section 4.1(j) of the Participation Agreement.

                  "Target  Sales"  shall mean,  with  respect to any period,  an
amount  (in tons)  equal to the  product  of (x) the Salt  Commitments  for such
period multiplied by (y) the Average Sales Percentage for such period.

                  "Tax" shall have the meaning  specified  in Section 7.4 of the
Participation Agreement.

                  "Tax Assumptions"  shall have the meaning specified in Section
2 of the Tax Indemnity Agreement.

                  "Tax Claim" shall have the meaning specified in Section 7.4(e)
of the Participation Agreement.

                  "Tax  Indemnity   Agreement"  shall  mean  the  Tax  Indemnity
Agreement in the form of Exhibit I to the Participation  Agreement,  dated as of
the  Closing  Date,  between  Owner  Participant  and  NACC,  as the same may be
amended, modified or supplemented in accordance with the provisions thereof.

                  "Tax  Law  Change"  shall  mean  (i)  one or  more  additions,
amendments,  modifications  or changes in or to (a) the  provisions  of the Code
(including for this purpose any


                                       33

<PAGE>



uncodified  provisions of legislation  affecting the Code) or (b) Regulations or
(ii) the issuance of published Internal Revenue  Procedures,  Revenue Rulings or
other administrative publications.

                  "Tenant"  shall have the meaning  specified in preamble of the
Site Lease.

                  "Termination Date" shall have the meaning specified in Section
12(a) of the Lease.

                  "Termination  Notice"  shall  have the  meaning  specified  in
Section 12(a) of the Lease.

                  "Title   Underwriter"   shall  mean  Chicago  Title  Insurance
Company.

                  "Transaction  Costs" shall mean the following fees,  expenses,
disbursements  and costs incurred in connection with the preparation,  execution
and delivery of the Operative Documents and the consummation of the transactions
contemplated  thereby on the Closing Date: (i) the reasonable fees, expenses and
disbursements  of Hunton &  Williams,  counsel for Owner  Participant;  (ii) the
reasonable fees,  expenses and  disbursements of special  California  counsel to
Owner  Participant;  (iii) the reasonable  fees,  expenses and  disbursements of
Carter,  Ledyard & Milburn,  counsel to Owner Trustee; (iv) the initial (but not
ongoing) fees and expenses of Owner Trustee;  (v) printing,  word processing and
reproduction  costs; (vi) the fees and expenses of the Appraiser with respect to
the  Appraisal;  (vii)  the  reasonable  fees and  expenses  of the  Engineering
Consultant   for  services   rendered  in  connection   with  the   transactions
contemplated  by the  Participation  Agreement;  (viii) the reasonable  fees and
expenses of the  Environmental  Consultant  for services  rendered in connection
with the  transactions  contemplated by the  Participation  Agreement;  (ix) the
reasonable fees and expenses of the Soda Ash Consultant for services rendered in
connection with the transactions  contemplated by the  Participation  Agreement;
(x)  the  reasonable  survey  costs  incurred  by NACC in  connection  with  the
transactions  contemplated by the Participation  Agreement;  (xi) the reasonable
title  insurance  and  related  costs  incurred by NACC in  connection  with the
transactions  contemplated by the Participation Agreement;  (xii) the reasonable
out-of-pocket  expenses of Owner  Participant  (including  computer  pricing and
travel expenses); (xiii) all fees, taxes and other charges payable in connection
with the  filing  of the  financing  statements  and  other  documents  filed in
connection with the transactions  contemplated by the  Participation  Agreement;
and (xiv) any other fees,  expenses,  disbursements and costs as shall have been
approved by both Owner Participant and NACC.

                  "Transaction  Date" means the date of the  transaction  giving
rise to the need to calculate the Interest Coverage Ratio.

                  "Transfer" by any Person shall mean any transfer,  conveyance,
sale, assignment,  lease or other disposition,  directly or indirectly,  by such
Person.


                                       34

<PAGE>



                  "Transfer  Agreement"  shall mean an Assignment and Assumption
Agreement  substantially  in  the  form  of  Exhibit  AA  to  the  Participation
Agreement,  to be entered into between  Owner  Participant  and a transferee  as
provided in Section 6.4(a) of the Participation Agreement.

                  "Trust Agreement" shall mean the Trust Agreement substantially
in the form of Exhibit H to the  Participation  Agreement,  dated as of July 12,
1996,  between Trust Company and Owner  Participant  that creates Searles Valley
Trust 1996, as the same may be amended,  supplemented  or modified in accordance
with the terms thereof.

                  "Trust  Company"  shall mean U.S. Trust Company of California,
N.A., in its individual capacity.

                  "Trust  Estate"  shall have the meaning  specified  in Section
2(b) of the Trust Agreement.

                  "Trust  Expenses" shall have the meaning  specified in Section
6.1 of the Trust Agreement.

                  "Trust  Office" shall mean the offices of the Owner Trustee at
the address provided in Section 9.1 of the Participation Agreement.

                  "Undivided  Interest"  shall  mean  the  fifty  percent  (50%)
undivided interest leased or purchased by the Owner Trustee, as the case may be.

                  "Unrestricted   Subsidiary"  shall  mean  (a)  any  Subsidiary
designated  as such by the Board of  Directors  of HCNA as set forth below where
(i)  neither  HCNA nor any of its other  Restricted  Subsidiaries  (A)  provides
credit  support  for,  or  Guarantee  of,  any  Debt of such  Subsidiary  or any
Subsidiary  of  such  Subsidiary   (including  any  undertaking,   agreement  or
instrument evidencing such Debt) or (B) is directly or indirectly liable for any
Debt of such  Subsidiary  or any  Subsidiary  of such  Subsidiary,  and  (ii) no
default with respect to any Debt of such  Subsidiary  or any  Subsidiary of such
Subsidiary  (including  any right  which the  holders  thereof  may have to take
enforcement action against such Subsidiary) would permit (upon notice,  lapse of
time  or  both)  any  holder  of any  other  Debt of  HCNA  and  its  Restricted
Subsidiaries  to  declare  a default  on such  other  Debt or cause the  payment
thereof to be accelerated or payable prior to its final scheduled maturity,  and
(b) any Subsidiary of an Unrestricted Subsidiary. The Board of Directors of HCNA
may designate any Restricted Subsidiary to be an Unrestricted  Subsidiary unless
such Restricted  Subsidiary owns any Capital Stock of, or owns or holds any Lien
on any property of, any other  Subsidiary  of HCNA which is not a Subsidiary  of
the  Restricted  Subsidiary  to be so  designated  or otherwise an  Unrestricted
Subsidiary;  provided,  that  either  (x)  the  Restricted  Subsidiary  to be so
designated  has total assets of $1,000 or less or (y)  immediately  after giving
effect to such  designation,  the  Consolidated  Cash Flow Ratio of HCNA and the
Restricted  Subsidiaries  of HCNA for the four full  fiscal  quarters  for which
quarterly or annual  financial  statements are available next preceding the date
of such designation,


                                       35

<PAGE>


calculated  on a pro  forma  basis as if such  designation  had been made at the
beginning of such four full fiscal quarters, shall be greater than 2.25 to 1.00;
provided,  further,  in the case of clause  (y),  HCNA could  make a  Restricted
Payment  in an amount  equal to the  greater of the fair  market  value and book
value of the  Restricted  Subsidiary  to be so  designated  pursuant  to Section
6.2(e) of the Participation Agreement.

                  "Utility  Trust  Estate"  shall have the meaning  specified in
Section 2(b) of the Power Contract Trust Agreement.

                  "Verifier" shall have the meaning  specified in Section 3.3 of
the Participation Agreement.

                  "Voting  Stock" of any Person shall mean Capital Stock of such
Person which  ordinarily  has voting  power for the  election of  directors  (or
persons performing  similar  functions) of such Person,  whether at all times or
only so long as no senior class of securities has such voting power by reason of
any contingency.

                  "Weighted Average Life to Maturity" shall mean with respect to
the  calculation of Break Costs on any  Determination  Date, the number of years
(calculated  to the  nearest  1/12)  obtained  by  dividing  the then  Remaining
Dollar-Years of the Lease by the applicable Stipulated Loss Value.

                  "Working Capital Facility" or "Facilities" of any Person shall
mean  any  agreement  or  agreements  between  such  Person  or  any  Restricted
Subsidiary of such Person and a financial institution or institutions, providing
for the making of loans, on a revolving basis, the issuance of letters of credit
and/or the  creation  of  bankers'  acceptances  the amount that may be borrowed
under which is based upon eligible accounts receivable and eligible inventories.


                                       36

<PAGE>




- - --------------------------------------------------------------------------------

                             FORM OF FACILITY LEASE
                             ----------------------

                       FACILITY LEASE - UNDIVIDED INTEREST
                           (Searles Valley Trust 1996)

                            dated as of July 15, 1996

                                     between

                     U.S. TRUST COMPANY OF CALIFORNIA, N.A.,

           not in its individual capacity, but solely as owner trustee
                under the Trust Agreement that creates the trust
                       identified under the title hereof,

                                   as Lessor,

                                       and

                        NORTH AMERICAN CHEMICAL COMPANY,

                                    as Lessee


- - --------------------------------------------------------------------------------



            Lease of an Undivided Interest in the Argus Utility Plant
                           Searles Valley, California


<PAGE>



                                TABLE OF CONTENTS

                           (Facility Lease Agreement)

                                                                           Page
                                                                           ----

PARTIES.....................................................................  1

Section 1.  Definitions.....................................................  1

Section 2.  Lease of the Facility and Sublease of the Site; Conflicts with
            Site Lease......................................................  1

Section 3.  Lease Term......................................................  1

Section 4.  Rent............................................................  2

Section 5.  Representations, Warranties and Agreements as to the Facility;
            Claims Under Warranties.........................................  4

Section 6.  Liens; Quiet Enjoyment..........................................  6

Section 7.  Lawful Use; Maintenance; Modifications and Additions............  6

Section 8.  Identification.................................................. 10

Section 9.  Insurance....................................................... 11

Section 10. Return of the Facility.......................................... 16

Section 11. Notice of Defaults.............................................. 18

Section 12. Voluntary Termination........................................... 18

Section 13. Event of Loss; Repair; Regulatory Event of Loss................. 21

Section 14. No Interest Conveyed to Lessee.................................. 23

Section 15. Sublease; Location.............................................. 24

Section 16. Inspection and Reports.......................................... 24

Section 17. Events of Default............................................... 25

Section 18. Remedies........................................................ 28


                                      - i -

<PAGE>


                                                                           Page
                                                                           ----

Section 19. Right to Perform for Lessee..................................... 32

Section 20. Renewal Terms................................................... 33

Section 21. Lessee's Options to Purchase the Undivided Interest in the
            Facility........................................................ 34

Section 22. End of Lease Term Notices; Procedures for Renewal or Purchase... 35

Section 23. Further Assurances.............................................. 36

Section 24. Counterparts; Uniform Commercial Code........................... 36

Section 25. Notices......................................................... 37

Section 27. Miscellaneous................................................... 37

Section 28. Limitations on Lessor Liability................................. 39



Schedule I   Description of Facility
Schedule II  Description of Site
Schedule III Interim Rent and Basic Rent
Schedule IV  Stipulated Loss Values


                                     - ii -

<PAGE>



                       FACILITY LEASE - UNDIVIDED INTEREST
                          (Searles Valley Trust 1996)

                  THIS FACILITY LEASE - UNDIVIDED  INTEREST dated as of July 15,
1996 (this  "Lease"),  is between  U.S.  TRUST  COMPANY OF  CALIFORNIA,  N.A., a
national  banking  association,  not in its individual  capacity,  but solely as
owner trustee under the Trust Agreement that creates the trust  identified under
the title hereof, as Lessor  ("Lessor"),  and NORTH AMERICAN CHEMICAL COMPANY, a
Delaware corporation, as Lessee ("Lessee").

                              W I T N E S S E T H:

                  Concurrently  with its  execution  and delivery of this Lease,
(i) Lessor is acquiring  the  Undivided  Interest in the Facility in  accordance
with the terms and  provisions of the  Participation  Agreement,  (ii) Lessor is
acquiring the  Leasehold  Estate from Lessee  pursuant to the Site Lease,  (iii)
Lessor now proposes to sublease  the  Leasehold  Estate to Lessee in  accordance
with the terms and  conditions  hereof and (iv) Lessor now proposes to lease the
Undivided  Interest in the Facility to Lessee in  accordance  with the terms and
conditions hereof.

                  NOW,  THEREFORE,  in  consideration  of the  mutual  terms and
conditions herein contained, the parties hereto agree as follows:

                  Section 1. Definitions. Capitalized terms used but not defined
herein  (including those used in the foregoing  recital) shall have the meanings
assigned to them in the Participation  Agreement  (Searles  Valley  Trust 1996),
dated as of the date hereof (the "Participation  Agreement") among Lessee, HCNA,
[Owner  Participant]  and Lessor.  All  references  to Sections,  Schedules  and
Exhibits  herein are to  Sections,  Schedules  and Exhibits to this Lease unless
otherwise indicated.

                  Section 2. Lease of the  Facility  and  Sublease  of the Site;
Conflicts  with Site Lease.  In  consideration  for the covenants and agreements
herein contained,  Lessor hereby leases to Lessee, and Lessee hereby leases from
Lessor, the Undivided  Interest in the Facility,  and Lessor hereby subleases to
Lessee,  and Lessee hereby  subleases from Lessor,  the Site to have and to hold
the same, together with all the rights,  privileges and appurtenances  thereunto
belonging, unto Lessee, its successors and permitted assigns, for the Lease Term
upon and subject to the covenants,  agreements,  terms, conditions,  limitations
and provisions  hereinafter set forth.  The Facility is described in Schedule I,
which Schedule I shall for all purposes  constitute part of this Lease. The Site
on which the Facility is located is described in Schedule II, which  Schedule II
shall for all  purposes  constitute  part of this  Lease.  The  rights of Lessee
arising  under or pursuant to this Lease are  subject to any  provisions  in the
Site Lease to the  contrary,  and in case of any conflict  between the rights of
Lessee under this Lease or as Site Lessor under the Site Lease, the terms of the
Site Lease shall control.

                  Section 3.  Lease  Term.  The Lease  Term shall  consist of an
interim term (the "Interim  Term")  commencing on the Closing Date and ending on
August 14, 1996 and a basic


                                        1

<PAGE>



term (the  "Basic  Term")  commencing  on the Basic Term  Commencement  Date and
ending on July 15, 2009, subject to earlier  termination in accordance with this
Lease and subject to renewal pursuant to Section 20.

                  Section 4. Rent. (a) Interim Rent; Basic Rent;  Sublease Rent.
(i) Lessee shall pay to Lessor,  as interim rent ("Interim Rent") in advance for
the  Undivided  Interest in the Facility,  on the Closing  Date,  the amount set
forth on Schedule III opposite the caption  "Interim  Rent".  On each Basic Rent
Payment  Date during the Basic Term,  Lessee  shall pay to Lessor Basic Rent (in
advance as set forth in Schedule  III) in the amount set forth on  Schedule  III
opposite  such Basic Rent Payment  Date.  Basic Rent with respect to any Renewal
Term shall be payable as provided  in Section  20(b).  Amounts of Interim  Rent,
Basic Rent and Stipulated  Loss Value  percentages  are subject to adjustment as
provided in Article III of the Participation Agreement.

                  (ii) During the Lease  Term,  Lessee  shall pay to Lessor,  as
rent for the  sublease by Lessor to Lessee of the  Leasehold  Estate,  an amount
equal to the amount  payable by Lessor to Site Lessor as rent under Section 4 of
the Site Lease.  The amount  payable by the Lessee  under this  Section  4(a)(i)
shall be due on each date on which rent is due from Lessor under Section 4(a) of
the Site Lease,  and shall  automatically be offset against the amount due under
such Section 4(a) of the Site Lease on each date on which such amount is due.

                  (b)  Supplemental  Rent.  Lessee  shall pay to  Lessor,  or to
whomever shall be entitled thereto as expressly  provided herein or in any other
Operative  Document,  any and all  Supplemental  Rent promptly as the same shall
become due and payable,  including  any interest  payable as provided in Section
4(d).

                  (c)  Method of  Payment.  Rent shall be paid to Lessor by wire
transfer of immediately  available funds to Owner  Participant's  account in New
York City at  [               ],  ABA No.:  [          ],  for credit to account
number [       ], Account Name:  [               ],  or to such other account as
Lessor shall  specify to Lessee on at least  fifteen (15)  Business  Days' prior
written  notice;  provided,  however,  that, in the case of  Supplemental  Rent,
payment  shall  be made to  whomever  shall be  entitled  thereto  as  expressly
provided  herein or in any other  Operative  Document.  Each payment of Rent due
hereunder shall be made by Lessee prior to 1:00 p.m., New York time, on the date
when such payment shall be due; provided,  however,  that if such date shall not
be a Business Day, such payment  shall be made on the next  succeeding  Business
Day with the same effect as if such payment had been made on the  scheduled  due
date  therefor  and no interest  shall accrue on the amount of such payment from
and after such scheduled due date.

                  (d) Late Payment. In the event any Rent shall not be paid when
due,  Lessee  shall pay to Lessor  (or,  in the case of  Supplemental  Rent,  to
whomever shall be entitled thereto as expressly  provided herein or in any other
Operative Document),  as Supplemental Rent, interest (to the extent permitted by
law) on such  overdue  amount  from the due date  thereof to the date of payment
thereof at the Overdue Interest Rate.


                                        2

<PAGE>




                  (e) Net Lease; No Set-off, Counterclaims, etc. This Lease is a
net lease and the  Lessee  hereby  acknowledges  and  agrees  that the  Lessee's
obligation  to pay all Rent  hereunder,  and the  rights of the  Lessor and each
other  Person  entitled  thereto  in  and  to  such  Rent,  shall  be  absolute,
unconditional  and irrevocable and shall be without  abatement,  suspension,  or
other  reduction  and  otherwise  shall not be released,  discharged or affected
(except  as  may be  expressly  provided  herein)  by  any  circumstance  of any
character,   including,   without  limitation:   (i)  any  set-off,   abatement,
counterclaim,   suspension,   recoupment,  reduction,  compromise,   settlement,
release,  modification,  amendment  (whether  material  or  otherwise),  waiver,
release or discharge (by act or operation of law), rescission,  defense or other
right or claim that Lessee may have against Lessor, the Trust Company, the Power
Contract Trustee, Owner Participant, the Operator, any contractor, any vendor or
manufacturer  of  any  equipment  or  assets  included  in the  Facility  or any
Modification  or any part of any  thereof,  or any other  Person  for any reason
whatsoever  (without prejudice to Lessee's right to assert such claim or defense
in a separate  action,  so long as Lessee  does not  set-off  the amount of such
claim  or  defense  against  its  obligation  to pay Rent  hereunder);  (ii) the
assignment  or pledging or the  purported  assignment  or pledging of all or any
part of the interest of Lessor,  Owner  Participant or Lessee in the Facility or
any portion  thereof or any defect in or failure of the title,  merchantability,
condition, design, compliance with specifications,  operation or fitness for use
of all or any part of the  Facility,  any  Modification,  any Part, or the Site,
(iii) any  damage to, or  removal,  abandonment,  dismantling,  decommissioning,
shutdown, salvage, scrapping,  requisition, taking, condemnation, loss, theft or
destruction of all or any part of the Facility,  any Modification,  any Part, or
the  Site,  or  any  interference,  interruption  or  cessation  in  the  use or
possession of the Facility or the Site, by Lessee or by any other Person for any
reason whatsoever or of whatever duration;  (iv) any charge, waiver,  extension,
indulgence  or other act or  omission  in  respect  of any duty,  obligation  or
liability of Owner Participant,  the Trust Company,  the Power Contract Trustee,
the Operator,  any contractor,  or any other Person or any claim that Lessee has
or might have against any Person  (including,  without  limitation,  any vendor,
contractor or manufacturer);  (v) any restriction,  prevention or curtailment of
or  interference  with  any  use  of  all  or any  part  of  the  Facility,  any
Modification, any Parts, or any right, title or interest in or to the Site; (vi)
any   insolvency,   bankruptcy,    reorganization,    composition,   adjustment,
dissolution,  liquidation, sale or other disposition of all or substantially all
the assets of, marshalling of assets or similar proceeding by or against Lessee,
Lessor,  Owner Participant,  the Trust Company,  the Power Contract Trustee, the
Operator, any contractor, or any other Person; (vii) the invalidity, illegality,
disaffirmance or unenforceability  (or the allegation of invalidity,  illegality
or unenforceability)  of this Lease, any other Operative Document,  or any other
instrument  referred  to herein or  therein  or any  other  infirmity  herein or
therein  or any lack of right,  power of  authority  of  Lessor,  Lessee,  Owner
Participant,  or any other Person to enter into this Lease,  any other Operative
Document,  or to perform the  obligations  hereunder or thereunder or consummate
the  transactions  contemplated  hereby  or  thereby  or any  doctrine  of force
majeure,  impossibility,  frustration or failure of  consideration or any action
taken by any  Person,  court or trustee  with  respect to any of the  foregoing;
(viii) the breach of or failure  to comply  with any  warranty,  representation,
covenant or other agreement made in this Lease, any other Operative  Document or
any other agreement by Lessee,  Lessor, Owner Participant,  or any other Person;
(ix) any failure, omission or delay on the part


                                        3

<PAGE>



of any Person to enforce,  assert or exercise  any right,  power or remedy under
any  Operative  Document;  (x) the  taking  or  omission  of any of the  actions
referred  to in any  Operative  Document;  or (xi)  any  other  circumstance  or
happening whatsoever, whether or not similar to any of the foregoing and whether
or not Lessee has notice or knowledge  of any such  circumstance  or  happening.
Lessee  hereby  waives,  any and all rights  that it may now have or that at any
time hereafter may be conferred upon it, by statute or otherwise,  to terminate,
cancel,  quit or surrender  this Lease or to effect or claim any  diminution  or
reduction of Rent payable by Lessee  hereunder,  except in  accordance  with the
express terms hereof.  Lessee  agrees that,  if for any reason  whatsoever  this
Lease shall be  terminated  or suspended in whole or in part by operation of law
or otherwise, then, except as expressly provided herein, the Lessee shall pay to
the Lessor or any other Person entitled thereto, an amount equal to each payment
of Basic Rent and all  payments of  Supplemental  Rent at the time such  payment
would have become due and payable in  accordance  with the terms hereof had this
Lease not been terminated or suspended in whole or in part. Each payment of Rent
made by Lessee  hereunder  shall be final and Lessee  shall not seek or have any
right to recover all or any part of such  payment  from the Lessor or any Person
for any reason  whatsoever.  All covenants,  agreements and  undertakings of the
Lessee herein shall be performed at its cost,  expense and risk unless expressly
otherwise  stated.  THIS  LEASE  (AND THE  PROVISIONS  HEREOF)  IS  INTENDED  TO
SUPERSEDE IN ALL RESPECTS THE  PROVISIONS  OF, THE RIGHTS  GRANTED UNDER AND THE
OBLIGATIONS  IMPOSED  BY  ARTICLE  2A OF THE  NEW  YORK  AND  ARTICLE  10 OF THE
CALIFORNIA  UNIFORM COMMERCIAL CODE, AND, TO THE FULLEST EXTENT NOW OR HEREAFTER
PERMITTED  BY  APPLICABLE  LAW, THE LESSEE  HEREBY  WAIVES ALL OF ITS RIGHTS AND
REMEDIES  UNDER SUCH  ARTICLE 2A AND SUCH  ARTICLE 10 EXCEPT  THOSE SET FORTH IN
SECTION 10308(C) OF THE CALIFORNIA  UNIFORM  COMMERCIAL CODE (AND THE PARTIES DO
NOT WAIVE THE PROVISIONS OF SECTION 3440.1K OF THE CALIFORNIA  CIVIL CODE),  AND
THE LESSEE HEREBY ACKNOWLEDGES AND AGREES THAT THE FOREGOING HAS BEEN NEGOTIATED
AND IS INTENDED TO BE A COMPLETE EXCLUSION AND NEGATION OF ALL  REPRESENTATIONS,
WARRANTIES  (INCLUDING,  WITHOUT  LIMITATION,  THOSE OF FITNESS FOR A PARTICULAR
PURPOSE AND OF  MERCHANTABILITY),  OBLIGATIONS  AND DUTIES,  EXPRESS OR IMPLIED,
IMPOSED ON THE LESSOR OR THE OWNER  PARTICIPANT  UNDER SUCH  ARTICLE 2A AND SUCH
ARTICLE 10 EXCEPT THOSE SET FORTH IN SECTION 10308(C) OF THE CALIFORNIA  UNIFORM
COMMERCIAL  CODE (AND THE PARTIES DO NOT WAIVE THE PROVISIONS OF SECTION 3440.1K
OF THE CALIFORNIA CIVIL CODE).  Nothing  contained in this Section 4(e) shall be
construed as a guarantee  by Lessee of the residual  value or useful life of the
Facility or any interest therein.  All obligations  imposed on Lessee under this
Lease shall be full recourse obligations of Lessee.

                  Section 5.  Representations,  Warranties  and Agreements as to
the  Facility;  Claims  Under  Warranties.  (a)  WITHOUT  WAIVING  OR  OTHERWISE
AFFECTING  ANY CLAIM  LESSEE OR LESSOR MAY HAVE  AGAINST ANY THIRD PARTY  (OTHER
THAN OWNER PARTICIPANT AND OWNER TRUSTEE),  LESSEE HEREBY REPRESENTS,  WARRANTS,
ACKNOWLEDGES AND AGREES THAT (I) THE FACILITY IS OF THE


                                        4

<PAGE>



SIZE, DESIGN,  CAPACITY AND MANUFACTURE SELECTED BY OR ON BEHALF OF LESSEE, (II)
LESSEE  IS  SATISFIED  THAT  THE  FACILITY  AND THE SITE  ARE  SUITABLE  FOR ITS
PURPOSES,  (III) LESSOR IS NOT A MANUFACTURER OF OR A DEALER IN PROPERTY OF SUCH
KIND AND (IV) THE  UNDIVIDED  INTERESTS  IN THE FACILITY AND THE SITE ARE LEASED
SUBJECT  TO  ALL  APPLICABLE  LAWS  AND  GOVERNMENTAL   REGULATIONS   (INCLUDING
ENVIRONMENTAL  LAWS)  NOW IN EFFECT OR  HEREAFTER  ADOPTED  AND IN THE STATE AND
CONDITION OF EVERY PART THEREOF WHEN THE SAME FIRST BECAME OR BECOMES SUBJECT TO
THIS LEASE, WITHOUT REPRESENTATION OR WARRANTY OF ANY KIND BY LESSOR, EXPRESS OR
IMPLIED,  AS TO THE  TITLE,  MERCHANTABILITY,  COMPLIANCE  WITH  SPECIFICATIONS,
CONDITION,  DESIGN,  OPERATION,  FREEDOM FROM PATENT OR TRADEMARK  INFRINGEMENT,
ABSENCE  OF LATENT  DEFECTS  OR  FITNESS  FOR USE OF THE  FACILITY  (OR ANY PART
THEREOF),  THE SITE (OR ANY PART THEREOF) OR THE UNDIVIDED  INTERESTS THEREIN OR
ANY OTHER  REPRESENTATION  OR  WARRANTY  WHATSOEVER,  EXPRESS OR  IMPLIED,  WITH
RESPECT TO THE FACILITY (OR ANY PART THEREOF) OR THE SITE (OR ANY PART THEREOF),
except that Lessor  hereby  represents  and  warrants  that the Facility and the
Undivided  Interest  therein shall be free of Lessor Liens. It is agreed that as
between  Lessor on the one hand and  Lessee on the  other,  except as  expressly
provided  herein,  all risks incident to the matters  discussed in the preceding
sentence  (other than those relating to Lessor Liens),  shall be borne by Lessee
both during the Lease Term and in  connection  with any transfer of the Facility
or any part  thereof  pursuant to Sections 12, 13, 18 or 22. The  provisions  of
this Section 5 (a) have been  negotiated,  and,  except to the extent  otherwise
expressly  stated,  the  foregoing  provisions  are  intended  to be a  complete
exclusion and negation of any  representations or warranties by Lessor,  express
or implied,  with respect to the Facility,  the Site or the  Undivided  Interest
therein,  whether arising pursuant to the Uniform Commercial Code or any similar
law now or hereafter in effect, or otherwise.

                  (b)  Claims  Under  Warranties.  (i) So  long as no  Event  of
Default has occurred and is continuing,  Lessor hereby assigns to Lessee,  until
the Lessor  Possession  Date, all of Lessor's  claims and rights,  if any, under
(including,  without limitation, the right to receive any payments made pursuant
thereto)  any  and  all  warranties  of,  and  other  claims  against,  dealers,
manufacturers,  vendors,  suppliers,  installers,  contractors or subcontractors
relating to the Facility or the Undivided Interest therein. Without limiting the
foregoing,  Lessor  agrees to execute  and  deliver  to Lessee any such  further
assignment  or assurances  as may  reasonably be deemed  necessary to facilitate
such enforcement by Lessee.

                  (ii) Lessee agrees to use commercially  reasonable  efforts to
preserve  and  protect   Lessor's   rights  under  any  warranty,   covenant  or
representation which is material to the use or operation of the Facility made by
any contractor,  subcontractor, vendor, manufacturer or supplier with respect to
the Facility or the Undivided  Interest therein,  and Lessee will take no action
which will impair such rights of Lessor and covenants to act in compliance  with
any  restrictions  or  requirements  prerequisite  to the  continued  existence,
enforcement,  validity  and  maintenance  of  any  such  warranty,  covenant  or
representation.


                                        5

<PAGE>




                  Section 6. Liens; Quiet Enjoyment. (a) Liens. During the Lease
Term, Lessee shall not directly or indirectly create, incur, assume or suffer to
exist any Lien on or with  respect to any portion of the  Undivided  Interest in
the Facility,  the Leasehold Estate,  the Site, the Easement Site or the Service
Facilities  or title thereto or any interest  therein or in any Lease  Financing
Document,  the Rent, any Sublease or any of the Lessor's Contract Rights, except
Permitted Liens, and Lessee shall promptly, at its own expense, take such action
as may be necessary duly to discharge,  eliminate or properly bond (in an amount
required  under  Applicable Law to release such Lien of record) any such Lien if
the same shall  arise at any time and shall  promptly  furnish  evidence of such
discharge to Lessor and Owner  Participant  upon request.  Nothing  contained in
this Lease shall be construed as constituting  the consent or request of Lessor,
express  or  implied,  to or for the  performance  by any  contractor,  laborer,
materialman  or vendor of any labor or  services  or for the  furnishing  of any
materials for any construction, alteration, addition, repair or demolition of or
to the Facility or any part thereof which would result in the Lessor's liability
for payment  therefor  that is not  indemnified  by Lessee  under the  Operative
Documents. Notice is hereby given that without its prior written consent, Lessor
will not be liable for any  labor,  services  or  materials  furnished  or to be
furnished to Lessee or to anyone holding an interest in the Facility,  Site, the
Easement  Site or Complex or any part thereof  through or under  Lessee,  and no
mechanics' or other Liens for any such labor, services or materials shall attach
to or affect the interest of Lessor in the Facility,  Site, the Easement Site or
the Undivided Interest.

                  (b) Quiet  Enjoyment.  Lessor  covenants that during the Lease
Term and so long as no Event of Default has occurred and is  continuing,  Lessee
shall peaceably and quietly have,  hold and enjoy the Undivided  Interest in the
Facility  and in the  Leasehold  Estate  as  lessee  in  possession,  free  from
interruption or disturbance by Lessor or by any other Person or Persons lawfully
entitled  to claim by,  through  or under  Lessor  on the  terms and  conditions
provided for under this Lease and the other Operative  Documents.  Such right of
quiet  enjoyment  is  independent  of, and shall not affect,  Lessor's  right to
exercise  its  rights  hereunder  or under any other  Operative  Document  or to
initiate  legal  action to  enforce,  including  by  specific  performance,  the
obligations of Lessee under this Lease or any other Operative Document.  Neither
Lessor nor any Person  claiming by or through Lessor shall have any liability to
Lessee for any  interference  with the use, quiet enjoyment or possession of the
Site arising out of the Site Lease, any defect in the title to the Site existing
on the date the Site Lease was entered  into or on the date hereof or arising as
a result of any action or inaction of Site  Lessor or any  Affiliate  thereof or
any Person  claiming by,  through or under Site Lessor or any Affiliate  thereof
other than Lessor and Persons claiming by, through or under Lessor.

                  Section  7.  Lawful  Use;   Maintenance;   Modifications   and
Additions.  (a) Lawful Use.  Lessee  agrees  that the  Facility,  the  Leasehold
Estate,  the Easement  Site , the License and the Site will at all times be used
and  operated in the regular  course of Lessee's  business (i) as a coal and gas
fired  steam and  electricity  generation  facility,  (ii) under and in material
accordance  with all  Approvals  necessary  for the  continued  operation of the
Facility  and  (iii)  under  and  in  compliance   with  all  applicable   Legal
Requirements (including,  without limitation, any thereof relating to matters of
occupational safety and health and Environmental


                                        6

<PAGE>



Laws),  unless  noncompliance  with (ii) or (iii)  above would only affect to an
insignificant extent the right, title or interest of Lessor or Owner Participant
in or to the Facility or the Undivided  Interest therein or the Leasehold Estate
or the continued economic  operation thereof or the value,  utility or remaining
useful life of the Facility or the Undivided Interest therein.

                  (b)  Maintenance.  (i) During the Lease Term,  Lessee,  at its
expense,  shall, and shall cause any sublessee to, maintain,  operate,  service,
repair  and  otherwise  use the  Facility  and the Site or cause  the same to be
maintained,  operated,  serviced, repaired and otherwise used, and shall conduct
its business affairs,  (i) in a prudent and responsible manner and in accordance
with all Operative  Documents,  (ii) in all material respects in accordance with
all Legal  Requirements  (including,  without  limitation,  Environmental  Laws)
applicable to the Facility or the Site, (iii) to the extent required to maintain
the Facility or the Site in as good  operating  condition as the Facility or the
Site is in on the Closing Date  (ordinary  wear and tear  excepted)  and (iv) in
accordance with sound  independent power industry  standards.  Lessee shall also
comply with (A) such repair  standards and periodic  maintenance  inspections as
shall be  required  to enforce  warranty  claims for each  material  Part of the
Facility and (B) any terms and conditions  imposed by any insurance  policies in
effect at any time with respect to the Facility and the Site or any part thereof
necessary  to preserve  applicable  coverages.  Lessee  shall keep and  maintain
proper  books  and  records  relating  to all  services  rendered  and all funds
expended for  maintenance and repair of the Facility or the Site or any portions
thereof,  all of which shall be available for inspection pursuant to Section 16.
Notwithstanding  anything  to the  contrary  herein  or in any  other  Operative
Document,  at the end of the Lease  Term the  Facility  and the Site shall be in
compliance  in  all  material  respects  with  all  Legal  Requirements   unless
compliance with such Legal Requirements  shall have been permanently  excused or
permanently exempted by a valid nonconforming use, permit, waiver,  extension or
forbearance exempting Lessor (if in the name of the Lessor) and/or any Person in
possession of the Facility under an agreement  with the Lessor,  as the case may
be, from such compliance.

                  (ii) Lessee shall provide the  Engineering  Consultant  with a
copy of Lessee's  maintenance  plan (including a description and schedule of all
major   maintenance)   on  the  Closing  Date.  If  Lessee  makes  any  material
modification or amendment to such maintenance  plan,  Lessee shall promptly (but
in any event within 15 days) provide (x) Owner  Participant  with notice of such
modification or amendment and (y) the Engineering  Consultant with a copy of the
maintenance plan as so modified or amended.  Lessee shall permit the Engineering
Consultant  to  meet  with  and  to  discuss  the  maintenance   plan  (and  any
modifications  and  amendments  thereto) with Lessee's  officers,  engineers and
other  appropriate  personnel,  and  Lessee  shall  consider  in good  faith any
suggestions  or changes with  respect to the  maintenance  plan  proposed by the
Engineering  Consultant.  Lessee shall be responsible  for all reasonable  fees,
costs and expenses of the Engineering Consultant in connection with this Section
7(b)(ii) not exceeding $5,000 per fiscal year.

                  (c)  Payment  of Taxes.  Lessee  shall pay all Taxes and other
impositions related to the Facility, the Easement Site or the Site as and to the
extent required by the Participation


                                        7

<PAGE>



Agreement. Upon the written request of Lessor or Owner Participant, Lessee shall
provide  such  Person  with  evidence  of the  payment  of such  Taxes  or other
impositions.

                  (d)  Replacement  of Parts.  Except (i) to the extent the same
shall result in or from an Event of Loss (in which case Section 13 shall apply),
(ii) with respect to Severable Modifications that are not Required Modifications
and (iii) as  provided  in Section  7(e),  Lessee,  at its  expense,  shall with
reasonable  promptness  restore,  substitute  or replace all Parts that may from
time to time become worn out, destroyed, damaged beyond repair, lost or rendered
permanently  unfit for use,  for any reason  whatsoever,  in each  case,  to the
extent  required to comply with Section 7(a) or 7(b). In the ordinary  course of
maintenance,  service or repair, Lessee may remove any Parts; provided, however,
that Lessee  shall  cause such Parts to be replaced as promptly as  practicable.
All restorations, substitutions and replacements for Parts ("Replacement Parts")
shall be free and clear of all Liens,  except  Permitted  Liens,  shall be in as
good an operating  condition as the Parts or  Replacement  Parts being  replaced
(assuming that such replaced  Parts or  Replacement  Parts were in the condition
required by this Lease),  shall be in the  condition  and repair  required to be
maintained  by the terms  hereof and shall not  diminish  the value,  utility or
remaining useful life of the Facility or the Undivided Interest. Notwithstanding
the  foregoing,  Lessee  may  install  temporary  Parts  pending  completion  of
permanent repairs or installation of permanent Replacement Parts, in which event
(A) Lessee shall install  permanent  Replacement  Parts meeting the requirements
set forth in this Section 7(d) or shall cause such temporary  Replacement  Parts
to meet such  requirements,  in either case as soon as  reasonably  possible (it
being understood that Lessee shall use reasonable  commercial efforts to install
such permanent  Replacement Part or to cause such temporary  Replacement Part to
meet such  requirements  no later than the date which is one year  following the
installation of the related temporary  Replacement  Part), and (B) in any event,
Lessee shall install such  permanent  Replacement  Part or cause such  temporary
Replacement Part to meet such requirements  prior to the return of the Undivided
Interest  in the  Facility  to Lessor.  Except  with  respect  to Parts  removed
pursuant to Section 7(e), the Undivided  Interest in Parts that are removed from
the Facility shall remain the property of Lessor, no matter where located, until
such time as such Parts shall be exchanged for  Replacement  Parts that meet the
requirements  for  Replacement  Parts  specified  above or shall be  replaced by
Replacement Parts that have been incorporated or installed in or attached to the
Facility and that meet the requirements  for Replacement  Parts specified above,
whichever  occurs earlier.  Immediately upon any such exchange for a Replacement
Part or upon any such Replacement Part becoming  incorporated or installed in or
attached to the Facility as above  provided,  without  further act, (i) title to
the  Undivided  Interest of Lessor in the removed Part shall  thereupon  vest in
Lessee or such Person as shall be  designated  by Lessee,  free and clear of all
rights of Lessor  and  Lessor  Liens,  and such Part shall no longer be deemed a
Part  hereunder,  and (ii) title to the Undivided  Interest in such  Replacement
Part shall  thereupon  vest in Lessor and become subject to this Lease and shall
be deemed  part of the  Facility  for all  purposes  to the same extent as Parts
originally incorporated or installed in or attached to the Facility.

                  (e)  Removal of Obsolete  Parts.  Lessee,  at its own expense,
may from time to time remove from the Facility  Parts that Lessee  determines to
be obsolete or no longer suitable


                                        8

<PAGE>



or appropriate for use in the Facility without the consent of Lessor and free of
any obligation to make any replacement or substitution  thereof and,  subject to
the last  sentence of this  Section  7(e),  Lessee  shall be entitled to sell or
otherwise dispose of such Parts without accounting to Lessor; provided, however,
that no such removal shall cause the Facility to become  limited use property or
diminish the value, utility, or remaining useful life of the Facility below what
such value,  utility or remaining  useful life thereof would have been (assuming
Lessee had fully complied with the provisions of this Lease) if such removal had
not been made.  To the extent  Lessee sells any Parts  removed from the Facility
pursuant to this Section 7(e) during the Lease Term,  the aggregate net proceeds
of all such sales during any fiscal year of Lessee in excess of $25,000 shall be
paid to Lessor.

                  (f) Modifications.  Except to the extent Lessee is involved in
a Permitted  Contest  with respect to such Legal  Requirement,  during the Lease
Term Lessee,  at its own  expense,  shall make all  alterations,  modifications,
additions  and  improvements  to the Facility and the Site (herein  collectively
referred  to as  "Modifications")  as may be  required  from  time  to  time  by
applicable Legal Requirements (including,  without limitation, any Environmental
Law) ("Required Modifications").

                  (g) Optional Modifications. So long as no Event of Default has
occurred and is continuing,  Lessee,  at its own expense,  may from time to time
make such other  Modifications  to the  Facility  or the Site as Lessee may deem
desirable in the proper conduct of its business; provided, however, that no such
Modification  shall (i) diminish the value,  utility or remaining useful life of
the  Facility  or the  Undivided  Interest  below  what such  value,  utility or
remaining  useful life would have been (assuming  Lessee had fully complied with
the  provisions  of this  Lease) if such  Modification  had not been made,  (ii)
adversely  affect the operation of the Facility,  other than to an insignificant
extent or (iii) result in any adverse tax  consequence to the Owner  Participant
(as  determined  by the Owner  Participant  in its sole  discretion);  provided,
further,  that  the  aggregate  amount  incurred  in  connection  with  any such
Modifications  shall  not  exceed  $5,000,000  during  any  period  of four  (4)
consecutive  fiscal  quarters  without the prior written  consent of the Lessor,
which consent may not be unreasonably withheld.

                  (h) Title to Modifications.  Title to Severable  Modifications
that are not Required Modifications shall vest in Lessee. So long as no Material
Default or Event of Default has occurred and is  continuing,  any such Severable
Modification  not owned by Lessor may be removed by Lessee  prior to or upon the
expiration of the Lease Term, subject to Lessor's right to purchase an undivided
interest in such Modification.  Upon notice from Lessor to Lessee given not more
than fifteen (15) days following the Lease  Termination  Date, Lessor shall have
the  right  to  purchase  a  fifty  percent  (50%)  undivided  interest  in  any
Modification  owned by Lessee that remains on the Site on the Lease  Termination
Date by giving  notice  (no later than  fifteen  (15) days  following  the Lease
Termination  Date and provided  the Other Lessor gives a comparable  notice also
electing  to  purchase  a  fifty  percent  (50%)  undivided   interest  in  such
Modification) to Lessee of its desire to purchase no later than thirty (30) days
following such notice, for cash, at a price equal to the Fair Market Sales Value
of such  undivided  interest  determined by the Appraisal  Procedure.  If Lessor
chooses to purchase any such undivided


                                        9

<PAGE>



interest,  Lessor shall pay the purchase  price for such  undivided  interest in
immediately available funds within thirty (30) days of the determination of such
price.  Any such  undivided  interest not  purchased by Lessor may be removed by
Lessee (x) if Lessor has not given  Lessee  notice  that it desires to  purchase
such  undivided  interest  within  thirty (30) days after the  expiration of the
Lease Term or (y) if Lessor has given such notice but has not paid the  purchase
price for such  undivided  interest  within  thirty (30) days after the purchase
price for such  undivided  interest  has been  determined.  Lessor shall have no
liability or obligation with respect to any such Modification  prior to purchase
by Lessor  pursuant to this Section  7(h).  In  addition,  in the event that the
Lessor  has  not  elected  to  purchase  an  undivided   interest  in  any  such
Modification,  upon the request of Lessor upon reasonable notice,  Lessee shall,
prior  to the  later  of (i) the  expiration  of the  Lease  Term  and  (ii) the
expiration  of  the  lease  term  of  the  Other  Lease,  remove  any  Severable
Modification  to which Lessee  retains title and repair any damage  resulting to
the  Facility or the Site from such  removal  other than damage  resulting  from
normal wear and tear,  and after  giving any such notice  Lessor shall no longer
have any right to purchase an undivided interest in such Modification.  Title to
an  Undivided  Interest  in  all  Severable   Modifications  that  are  Required
Modifications and all Nonseverable Modifications shall automatically, upon being
affixed to the Facility or the Site, vest in Lessor, free and clear of all Liens
except Permitted Liens, and become subject to the Lease.

                  (i)  Reports  of  Modifications.  On or before  the  ninetieth
(90th) day of each fiscal  year of Lessee  during the Lease Term and on the date
on which the Lease Term shall  expire,  Lessee  shall  furnish  Lessor and Owner
Participant with a report stating the total cost of all Modifications during the
prior fiscal year (or shorter  period) and  describing in reasonable  detail all
Modifications,  the cost of which  (excluding  design  and  installation  costs)
exceeds $50,000.

                  (j)  Location.  Lessee  shall  not  remove,  or  permit  to be
removed,  any material Part from the Site without the prior  written  consent of
Lessor,  except  that,  if no  Material  Default or Event of Default  shall have
occurred  and be  continuing,  Lessee may remove from the Site any Part title to
which has vested in Lessee in  accordance  with the terms of Section 7(h) or may
remove any  obsolete or worn out part in  accordance  with  Section 7(e) and may
remove  any Part which  requires  maintenance,  repair,  service or testing at a
location  other than the Site;  provided,  in the case of Parts other than those
removed in accordance  with Section 7(e) or Section 7(h),  such Part is returned
to the Site promptly after completion of such maintenance,  repairs,  service or
testing.

                  Section 8.  Identification.  Throughout the Lease Term, Lessee
shall  maintain  markers or signs in prominent  places in and about the Facility
including  the  inscription  "UNDIVIDED  INTERESTS IN THIS  FACILITY AND CERTAIN
PROPERTY LOCATED HEREIN ARE OWNED BY U.S. TRUST COMPANY OF CALIFORNIA,  N.A., AS
OWNER-LESSOR,  AND ARE LEASED TO NORTH  AMERICAN  CHEMICAL  COMPANY."  Except as
above  provided or as otherwise  directed by Lessor,  Lessee shall not allow the
name of any Person other than that of Lessee or its  Affiliates  to be placed on
any component of the Facility  subject to this Lease as a designation that might
reasonably be interpreted as a claim of


                                       10

<PAGE>



ownership or right  (except for the rights of any  sublessees,  assignees or the
Operator of the Facility permitted under the Operative  Documents) to possession
or use thereof.

                  Section  9.  Insurance.  (a)  Coverage.  During the Lease Term
(including any Renewal Term) Lessee, at its expense, will maintain the following
minimum  insurance  coverages  with  respect to the  Facility,  the Site and the
Complex with insurers of recognized financial standing authorized to do business
in California and having an A.M. Best Rating of A- X or as otherwise  acceptable
to Lessor.  Such policies  shall have terms and  conditions  that are reasonably
satisfactory to Lessor:

                      (i)  all  risk  property  insurance,  including,  but  not
         limited to, fire and extended coverage, collapse, earthquake, flood and
         comprehensive   boiler  and  machinery  coverage  including  production
         equipment.  Such policy or policies shall be written in amount not less
         than the higher of (x) the then current repair or replacement  value of
         the Facility and the Complex and (y) the  Stipulated  Loss Value.  Such
         policy or policies shall be written on a  no-coinsurance  form and on a
         replacement  cost basis and contain  demolition  and increased  cost of
         construction  coverage.  Notwithstanding  the  above,  such  policy  or
         policies may contain  combined  property  damage/business  interruption
         sublimits  of  $125,000,000  for  comprehensive  boiler  and  machinery
         coverage;  $100,000,000  for earthquake  coverage;  and $75,000,000 for
         flood  coverage.  To the extent that boiler and  machinery  coverage is
         provided under a separate policy,  the all-risk property and boiler and
         machinery policies shall contain joint loss agreements;

                     (ii) business  interruption  insurance covering loss of net
         profits and continuing expenses (including the amount of Basic Rent for
         one year) and extra  expense  insurance  covering  additional  expenses
         incurred  to  continue  the  normal  operation  of  business  following
         physical  loss  or  damage.   Such  coverage  shall  be  written  on  a
         no-coinsurance form;

                    (iii)  comprehensive  general liability insurance written in
         an  amount  not  less  than  $1,000,000  and  shall  be  written  on an
         occurrence  form.  Such policy  shall  include,  but not be limited to,
         premises/operations,   XCU,   broad   form   contractual,   independent
         contractors,  products and  completed  operations,  broad form property
         damage and  personal  injury.  Such policy shall be endorsed to contain
         worldwide territorial limits;

                     (iv) comprehensive auto liability insurance covering owned,
         hired  and  non-owned  vehicles  written  in an  amount  not less  than
         $1,000,000;

                      (v)  workers'   compensation   insurance  as  required  by
         applicable law and employer's  liability  written in an amount not less
         than $1,000,000 per accident/disease; and

                     (vi) excess  liability  insurance  written in an amount (x)
         not less  than  $100,000,000  on a  blanket  basis or (y) not less than
         $50,000,000 which shall apply


                                       11

<PAGE>



         solely  to  the  Facility.  In  the  case  of (x)  or  (y),  the  first
         $50,000,000  of coverage  shall be written on an  occurrence  basis and
         shall apply above the primary  limits.  Such coverage shall apply above
         the  primary  limits  of  the  comprehensive  general  liability,  auto
         liability,  and employer's  liability policies and shall contain a drop
         down  provision  in the event of  exhaustion  of  underlying  limits or
         aggregates and apply on a following form basis.

                    (vii) If any  insurance  required to be maintained by Lessee
         pursuant to this Section 9 (including  the limits on deductibles or any
         other  terms  under  policies  for such  insurance)  ceases  to  become
         available on a  commercially  reasonable  basis at the time of renewal,
         Lessee shall provide  written notice to Lessor  accompanied by a letter
         from  Lessee's   insurance   broker  stating  that  such  insurance  is
         unavailable on a commercially  reasonably  basis.  Such notice shall be
         given not less than  thirty (30) days prior to the  scheduled  date for
         renewal of any such  policy.  Upon  receipt of such  notice  Lessor and
         Lessee  shall   immediately   negotiate  in  good  faith  to  obtain  a
         commercially reasonable alternative to such insurance.

                  In the event that Lessor and Lessee can not reach a resolution
acceptable to both parties within five (5) days,  Lessor shall make arrangements
for the formation of an insurance panel consisting of Lessee's insurance advisor
(or broker), Lessor's insurance adviser (or broker) and an independent insurance
expert chosen by Lessor and  reasonably  acceptable  to Lessee  selected from an
internationally  recognized insurance  brokerage.  Such independent expert shall
conduct a separate review of the relevant insurance requirements of this Section
9 and the market for such insurance at the time, giving due consideration to the
representations of both insurance  advisors,  and upon conclusion of such review
shall issue a written report stating that such insurance is either  available or
not available on a  commercially  reasonable  basis.  In the event the insurance
expert  concludes  that  such  insurance  is  not  available  on a  commercially
reasonable  basis, the insurance  expert shall provide a written  recommendation
not less than  fifteen  (15) days before the date for renewal of such  insurance
which shall be  conclusive  and binding on both Lessee and Lessor.  Lessor shall
issue a waiver to Lessee for a period of one (1) year upon the insurance  expert
certifying  that the  relevant  insurance  is not  available  on a  commercially
reasonable  basis and the Lessee having  implemented the  recommendation  of the
insurance expert.

                  All fees,  costs and expenses  associated  with the  insurance
panel  (including  the  review by the  insurance  expert)  shall be for the sole
account of Lessee.

                  (b)  Policy  Provisions.  All  insurance  maintained by Lessee
pursuant to Section 9(a) shall:

                      (i)  include  (x)  Lessor  and  Owner  Participant  as  an
         additional named insured with respect to the insurance carried pursuant
         to Sections  9(a)(i) and 9(a)(ii)  with respect to the Facility and the
         Site and as an additional insured with respect to the insurance carried
         pursuant to Sections  9(a)(iii) and 9(a)(vi) and with the understanding
         that any


                                       12

<PAGE>



         obligation  imposed  upon  Lessee  (including  but not  limited  to the
         obligation to pay premiums)  shall be the sole obligation of Lessee and
         not that of Lessor or Owner  Participant and (y) to the extent of their
         Undivided  Interests in the Facility,  Lessor and Owner  Participant as
         the sole loss  payees with  respect to  insurance  carried  pursuant to
         Section  9(a)(i) and as sole loss payees with respect to any Basic Rent
         which is then due and payable and covered by insurance carried pursuant
         to Section 9(a)(ii);

                     (ii) include effective waivers by the insurer of all claims
         for insurance  premiums and other costs and expenses against Lessor and
         Owner Participant;

                    (iii)  provide    that   any   losses   shall   be   payable
         notwithstanding:

                           (1) any act of negligence and any action, inaction or
                  misrepresentation  (including  any breach of any  condition or
                  warranty in any policy of insurance), of Lessee, HCNA or HCG;

                           (2) the occupation or use of the Facility or the Site
                  or any part thereof for purposes more hazardous than permitted
                  by the terms of the policy;

                           (3) any foreclosure or other  proceeding or notice of
                  sale relating to the Facility or the Site; or

                           (4) any change in the title to or ownership of any of
                  the Facility, the Site or the Undivided Interest therein.

                     (iv) provide that such insurance shall be primary insurance
         and that the insurers  under such  insurance  policies  shall be liable
         under  such  policies  without  right of  contribution  from any  other
         insurance  coverage  effected  by Lessee,  Lessor or Owner  Participant
         under any other insurance  policies with any other insurance  companies
         covering  a loss which is also  covered  under the  insurance  policies
         maintained by Lessee pursuant to this Section 9;

                      (v) provide that the  applicable  insurer shall provide at
         least  thirty  (30) days'  written  notice  (or ten (10) days'  written
         notice for any  cancellation in the event of non-payment of premium) to
         Lessor and Owner  Participant prior to the effective date of any lapse,
         cancellation  or material  change  thereof shall be effective  until at
         least thirty (30) days after receipt by Lessor and Owner Participant of
         written notice thereof from the applicable insurer;

                     (vi) waive any right of subrogation of the insurers against
         Lessor and Owner Participant and waive any right of the insurers to any
         set-off or counterclaim or any other  deduction,  whether by attachment
         or  otherwise,   in  respect  of  any  liability  of  Lessor  or  Owner
         Participant; and



                                       13

<PAGE>



                    (vii) with  respect to the  insurance  carried  pursuant  to
         paragraphs (iii) and (vi), be endorsed to provide that, inasmuch as the
         policy  is  written  to  cover  more  than  one  insured,   all  terms,
         conditions,  insuring agreements, and endorsements,  with the exception
         of limits of  liability,  shall  operate in the same manner as if there
         were a separate policy covering each insured.

                  (c)  Adjustment and Payment of Losses.  Losses,  if any, under
any property or business  interruption  insurance carried hereunder  pursuant to
Section  9(a)(i) or 9(a)(ii),  respectively,  with respect to the Facility,  the
Site, the Complex or the Undivided Interests therein, shall be adjusted with the
insurance companies by Lessee, or otherwise  collected,  including the filing of
proceedings deemed advisable by Lessee, subject to the approval of Lessor, which
approval shall not be unreasonably  withheld,  in the event that such loss is in
excess of  $2,500,000  or if an Event of  Default  shall  have  occurred  and be
continuing.  The loss so  adjusted  shall be paid to  Lessor  to the  extent  of
Lessor's  Undivided  Interest  in the  Facility,  or,  in the  case of  business
interruption  insurance, as set forth in Section 9(f), unless the amount of such
loss is  $2,500,000 or less, in which case such amount shall be paid directly to
Lessee for  application  pursuant  to Section  9(f),  unless an Event of Default
shall have  occurred and be  continuing,  in which case all  insurance  payments
shall be made to Lessor to the  extent of  Lessor's  Undivided  Interest  in the
Facility and the Site as security for  performance by Lessee of its  obligations
hereunder and shall be invested in accordance  with Section 26 until released to
Lessee or otherwise applied in accordance with the terms hereof.  Losses covered
by general  liability  insurance shall be adjusted by the insurance  carrier and
paid to the Person suffering such loss.

                  (d) Certificates of Insurance.  On or before the Closing Date,
and on or before each policy  anniversary  date,  Lessee shall deliver to Lessor
certificates  of  insurance  executed by the  relevant  insurers  (or their duly
authorized  agents)  describing in reasonable detail all insurance policies with
respect to the Facility  which  Lessee is required to maintain  pursuant to this
Section 9. Upon request,  Lessee shall provide Lessor and Owner Participant with
copies of all policies of insurance required to be maintained under this Section
9.

                  (e) Annual Insurance Report. On or before the Closing Date and
concurrently  with the  furnishing  of  certificates  pursuant to Section  9(d),
Lessee shall deliver, or cause to be delivered,  to Lessor and Owner Participant
a report signed by Marsh & McLennan,  Inc. or such other  nationally  recognized
insurance  broker or any  other  insurance  broker  mutually  acceptable  to the
parties  showing all insurance then carried and  maintained  with respect to the
Facility,  the Site and the Undivided  Interests  therein by Lessee  pursuant to
this  Section 9 and stating  that in the  opinion of such broker such  insurance
complies  with the terms of  Sections  9(a),  (b),  (h),  (i) and (j) hereof and
further stating whether all premiums then due thereon have been paid and whether
such insurance is in full force and effect.

                  (f) Payment of Proceeds. Unless an Event of Default shall have
occurred  and be  continuing  (in which  case all  insurance  proceeds  shall be
invested in  accordance  with  Section 26 until  released to Lessee or otherwise
applied in accordance with the terms hereof), all


                                       14

<PAGE>



insurance proceeds received by or payable to Lessor on account of (x) any damage
to or  destruction of the Facility or any part thereof other than any damages or
destruction  constituting  an Event of Loss,  shall be paid  over by  Lessor  to
Lessee or as Lessee may direct  from time to time as repair and  restoration  of
the Facility  ("Restoration")  progresses to pay (or  reimburse  Lessee for) the
Undivided  Interest  multiplied  by the cost of  Restoration,  but only upon the
written request of Lessee accompanied by appropriate  evidences  satisfactory to
Lessor that such proceeds, together with insurance proceeds received and not yet
disbursed by Other Lessor on account of such damage or destruction  and funds of
Lessee  available for the purpose,  shall be  sufficient to complete  repair and
restoration  of the Facility and the Site and (y) any business  interruption  to
the extent of Lessor's  Undivided  Interest in the  Facility  applicable  to the
Facility or the Site and arising from physical damage to the Facility,  the Site
or the Complex, shall be caused by Lessee to be placed in escrow up to an amount
equal to the next  installment  of Basic Rent that will become due and  payable.
Upon  receipt  by  Lessor  of  evidence  satisfactory  to  it  that  repair  and
restoration have been completed and the cost thereof paid in full and that there
are no mechanics' or similar Liens for labor or materials supplied in connection
therewith  (other than Permitted Liens that are subject to a Permitted  Contest)
on the Facility,  the Site or the Undivided  Interest therein,  the balance,  if
any, of such proceeds shall be paid over to Lessee or as it may direct. Prior to
any application of insurance  proceeds  pursuant to the preceding  provisions of
this Section  9(f),  if an Event of Default shall have occurred or be continuing
at the time of the requested  application  of any such  proceeds,  such proceeds
shall,  unless  dealt with in  accordance  with  Section  13 hereof,  be held as
security for  performance  by Lessee of its  obligations  hereunder and, at such
time as no Event of Default shall be continuing,  any such proceeds then so held
as security shall be applied in accordance  with this Section 9(f) unless Lessor
shall have theretofore  declared this Lease to be in default pursuant to Section
18  hereof,  in which  event such  proceeds  shall be  disposed  of by Lessor in
accordance with the provisions thereof.

                  (g)  Additional  Insurance.  Each  of  Lessor  and  the  Owner
Participant  shall have the right,  at its own expense and for its own exclusive
benefit,  to obtain any  insurance in respect of the Facility and the  Leasehold
Estate or any part  thereof so long as such  insurance  does not prevent  Lessee
from carrying the  insurance  required by this Section 9 or (ii) does not reduce
the amounts  payable  under the  insurance  required to be  maintained by Lessee
pursuant to this Section 9. In addition to the foregoing,  if Lessee shall be in
default in respect of its  obligation  to obtain  insurance  pursuant to Section
9(a),  Lessor  shall,  after notice of such default to Lessee and the failure of
Lessee forthwith to remedy the same, have the right (without, in any way, either
limiting or otherwise modifying any other rights or remedies of, or imposing any
obligation  on,  Lessor under this Lease by reason of such default or otherwise)
to obtain such  insurance  at the  expense of Lessee and, in such event,  Lessee
shall reimburse Lessor upon demand for the cost thereof,  together with interest
thereon at the Overdue Interest Rate, as Supplemental Rent.

                  (h)  Deductibles.  (i) The combined deductible or self-insured
retention for property  insurance  coverages  maintained  by Lessee  pursuant to
Section 9(a)(i) (all risk property


                                       15

<PAGE>



damage  insurance)  and 9(a)(ii)  (business  interruption  insurance)  shall not
exceed $250,000 per occurrence.

                  (1) The deductible or self-insured retention for comprehensive
boiler and machinery  property damage insurance shall not exceed  $1,500,000 per
occurrence.

                  (2) The  deductible or  self-insured  retention for boiler and
machinery business interruption insurance coverage shall not exceed fifteen (15)
times the average daily value of production.

                  (3) The  deductible  or  self-insured  retention  for combined
earthquake physical damage and earthquake business  interruption  coverage shall
not exceed $10,000,000.

                  (ii) The  deductible  or  self-insured  retention on insurance
coverages  maintained by Lessee  pursuant to Sections  9(a)(iii)  (comprehensive
general liability insurance),  9(a)(iv) (comprehensive auto liability insurance)
and 9(a)(v)  (workers'  compensation  insurance)  shall not exceed  $250,000 per
occurrence.

                  Section 10.  Return of the  Facility.  (a) At End of Term.  If
Lessee has not purchased  the  Undivided  Interest in the Facility in accordance
with the terms hereof and if Lessee  elects not to renew this Lease  pursuant to
Section 20 at the end of the Basic Term or any Renewal Term,  Lessee  shall,  on
the last day of the Basic Term or the Renewal Term, as the case may be, (whether
such date is the scheduled expiration date of the Basic Term or Renewal Term, as
the case may be, or an earlier  date upon which the Lease Term ends  pursuant to
Section 12(a) (but only if Lessor has elected to retain the  Facility)),  as the
case may be,  deliver  possession of the Undivided  Interest in the Facility and
the Leasehold  Estate to Lessor or its designee or  transferee  (as specified by
Lessor  to Lessee  in  writing  not less  than 10  Business  Days  prior to such
expiration or  termination  date) in  accordance  with the terms of this Section
10(a).  Lessee shall effect  delivery of the Undivided  Interest in the Facility
and the Leasehold  Estate at its cost and expense by executing and delivering to
Lessor or its designee or transferee an  instrument or  instruments  in form and
substance  reasonably  satisfactory to Lessor (i) evidencing surrender by Lessee
of all of Lessee's  rights to the  Undivided  Interest in the  Facility  and the
Leasehold  Estate under this Lease and to possession  thereof,  which  Undivided
Interest in the Facility and the Leasehold Estate shall be free and clear of all
Liens,  other than Lessor Liens and Permitted  Liens of the types referred to in
clauses (a) (but not including  the rights and interests of NACC and HCNA),  (c)
(but not including Liens being contested pursuant to a Permitted Contest),  (f),
(h),  (i) (j)  and  (l) of the  definition  of  Permitted  Liens  and  (ii)  the
satisfaction  by  Lessee  of all its  obligations  as  "Seller"  under the Power
Purchase  Agreement that have accrued and were due to be performed or paid prior
to the  termination  of the  Sub-Assignment  (as  defined in the Power  Contract
Assignment).  Lessee  shall  deliver  to Lessor or its  designee  or  transferee
originals or copies of all records,  manuals and other  written data then in the
possession  of Lessee which is used by Lessee for the  operation of the Facility
and the  Leasehold  Estate.  Immediately  prior  to  delivery  of the  Undivided
Interest in the  Facility,  the Facility and the  Leasehold  Estate shall in all
respects comply with all of the terms of Section


                                       16

<PAGE>



7 which  are  applicable  to the  Facility  and the  Leasehold  Estate.  Without
limiting  the  generality  of  any  of  the  other  terms  of  this  Lease,  the
Participation Agreement or the other Operative Documents, Lessee shall be liable
for any  costs,  expenses  or  damages  incurred  by Lessor or its  designee  or
transferee  as a result of Lessee's  failure to duly perform and comply with any
of the terms of this Section 10(a).

                  (b)  Environmental  Audit.  If (i) Lessee  has not  elected to
purchase the Undivided  Interest in the Facility or to renew this Lease pursuant
to Section 20 at the end of the Basic Term or any Renewal  Term,  or (ii) Lessor
elects to (x) retain the Facility  following receipt of a Termination  Notice or
(y) exercise its remedies pursuant to Section 18 resulting in the relinquishment
by Lessee to Lessor of  possession  of the  Undivided  Interest in the Facility,
then (A) in the case of  Lessee's  election  not to  exercise  its  purchase  or
renewal  options or Lessor's  election to retain the  Facility,  at least ninety
(90) but not more than one  hundred  fifty  (150)  days  prior to the end of the
Basic Term or Renewal Term, as the case may be, or (B) in all other cases,  upon
relinquishment  of the  Undivided  Interest in the  Facility  to Lessor,  Lessee
shall, at Lessee's sole cost and expense,  arrange for an environmental audit of
the  Facility  and the Site and  provide  to Lessor a report or  reports of such
audit (collectively, "Environmental Report") as described in this Section 10(b).
The environmental audit shall be conducted and the Environmental Report prepared
in accordance with industry standards and customs by an Environmental Consultant
selected  by Lessee and  reasonably  acceptable  to Owner  Participant,  and the
Environmental  Report shall be  reasonably  acceptable  in form and substance to
Owner  Participant.  The  environmental  audit  shall  consist  of (i) a Phase I
environmental site assessment,  (ii) an environmental compliance audit detailing
any actual or threatened violations of or non-compliance with Environmental Laws
and  (iii) an  estimate  of  current  liabilities  under  Environmental  Laws in
connection with the Facility and the Site.  Thereafter Lessee shall, at its sole
cost and  expense,  diligently  and in good  faith  arrange  for any  additional
investigations  (including  Phase II  environmental  assessments) and conduct to
completion any  environmental  remediation  relating to the Facility or the Site
that is reasonably  prudent  pursuant to industry customs and standards based on
the  results  of the  Environmental  Report or  required  under  any  applicable
Environmental  Law. Lessor and Lessee shall consult with one another  concerning
the appropriate scope of all reports,  investigations and remediation subsequent
to the initial  environmental  audit, and Lessee shall keep Lessor informed with
respect  to  any  discussions  and  negotiations  with  applicable   Authorities
concerning potential plans to correct any violation or non-compliance or conduct
remedial  activities.  Any  remediation  plan  shall  include,  but shall not be
limited to, plans for full response,  remediation,  removal, or other corrective
action, and the protection, or mitigative action associated with the protection,
of  natural  resources  including  wildlife,  aquatic  species,  and  vegetation
associated with the Facility,  the Site or any Modification,  as required by all
applicable  Environmental  Laws.  Lessee  shall  have the right to  control  the
planning and  implementation of any environmental  remediation  pursuant to this
Section  10(b);  provided,  however,  that Lessee shall consult with Lessor with
respect  thereto and shall not perform any such activity in a manner  adverse in
any way to Lessor (as reasonably determined by Lessor).  Lessor and Lessee shall
cooperate with each other with respect to all such matters.  In any case, if the
aggregate cost of  implementing  and completing  such  remediation  plan (or any
amendments, revisions or modifications thereto) together with any


                                       17

<PAGE>



Liens, fines, fees or civil or stipulated penalties resulting from any violation
of or non-compliance with Environmental Laws or any Release is reasonably likely
to equal or exceed  $500,000 in the  estimate of the  Environmental  Consultant,
Lessee shall provide to Lessor,  within 30 days of Lessor's  written  demand,  a
bond, letter of credit or other evidence of financial responsibility  reasonably
satisfactory  to Lessor  for the  amount of the  estimated  aggregate  costs and
expenses in excess of $500,000.

                  (c) Following  End of Lease Term.  Upon notice from Lessor and
the Other Lessor given (i) if a Processing  Services Election (as defined in the
Services Agreement) has not been made, at any time on or after the expiration or
termination  of the Lease  Term but in no event  later  than one year after NACC
ceases  to be  Operator  pursuant  to  the  Services  Agreement,  or  (ii)  if a
Processing  Services  Election has been made,  at any time within one year after
the earlier to occur of Final  Shutdown (as defined in the  Services  Agreement)
and the expiration or termination of the Services Agreement, then, unless Lessee
shall have purchased the Undivided  Interest in the Facility in accordance  with
the terms hereof,  Lessee (at its own expense)  shall  disassemble  the Facility
and,  as agent for  Lessor (to the extent of the  Undivided  Interest  therein),
dismantle  the Facility and deliver the  salvageable  portions of the  Facility,
disassembled, to the railhead or other suitable common carrier nearest the Site.
Notwithstanding  the  foregoing,  Lessee  may,  within  thirty  (30) days  after
determination of the Fair Market Sales Value for the Facility, at its option and
in lieu of its  obligation  to dismantle  the  Facility,  purchase the Undivided
Interest in the Facility,  for a purchase  price equal to the greater of (A) the
Fair Market Sales Value of the Undivided Interest in the Facility, determined by
the  Appraisal  Procedure,  and (ii) One  Dollar  ($1.00).  Upon  receipt of the
purchase price, the Lessor shall transfer and assign all of its right, title and
interest in and to the  Undivided  Interest in the Facility to Lessee or to such
other Person as Lessee may direct,  free and clear of Lessor Liens and otherwise
on an "as is, where is" basis,  and the Lessor shall  execute and deliver one or
more bills of sale, together with such other documents  evidencing such transfer
and  assignment as may be  reasonably  requested by the Lessee in order to carry
out such transfer and assignment to the Lessee. This Section 10(c) shall survive
the expiration or termination of this Lease and the other Operative Documents.

                  Section 11. Notice of Defaults. Lessee shall furnish to Lessor
and Owner  Participant  promptly  after a Responsible  Officer of Lessee or HCNA
obtains  knowledge of the occurrence of a Default,  Event of Default or Event of
Loss a certificate of a Responsible  Officer of Lessee  specifying the nature of
such condition or event, the period of existence thereof,  the action Lessee has
taken or proposes to take with respect thereto and the date, if any, on which it
is estimated that such event or condition shall be remedied or terminated.

                  Section 12. Voluntary Termination.  (a) Notice of Termination.
So long as no Event of Default  shall have  occurred and be  continuing,  in the
event that,  the board of directors of the Lessee  determines  that the Facility
has  become  obsolete,  surplus  or  uneconomic  to  Lessee's  requirements,  as
evidenced by a resolution of such board of directors to such effect delivered to
Lessor,  then,  at any time  after the  seventh  anniversary  of the Basic  Term
Commencement  Date and prior to the expiration or termination of the Basic Term,
Lessee shall


                                       18

<PAGE>



have the right, at its option, on at least twelve (12) months, but not more than
twenty-four  (24) months,  prior written  notice (the  "Termination  Notice") to
Lessor,  to terminate this Lease,  such termination to be effective on the Basic
Rent Payment Date specified in such notice (the "Termination  Date") which Basic
Rent  Payment Date shall occur after the seventh  anniversary  of the Basic Term
Commencement  Date and prior to the expiration or termination of the Basic Term;
provided,  that Lessee  shall only be able to exercise  the  termination  option
under this Section  12(a) to the extent it is also  exercising a similar  option
under  the  Other  Lease.  Within  three  (3)  months  following  receipt  of  a
Termination   Notice,   Lessor  shall  notify  Lessee  in  writing  of  Lessor's
irrevocable election to (a) retain the Undivided Interest in the Facility or (b)
sell the  Undivided  Interest in the  Facility.  If Lessor fails to deliver such
notice within the three (3) month period  described in the  preceding  sentence,
Lessor  shall be deemed to have  elected to sell the  Undivided  Interest in the
Facility.  If Lessor  elects to retain the  Undivided  Interest in the  Facility
pursuant to this  Section  12(a),  Lessee  shall,  on the  Termination  Date (i)
deliver the  Facility  to Lessor in the same manner as if delivery  were made to
Lessor  pursuant to Section  10(a) and (ii) pay to Lessor,  in funds of the type
specified  in Section  4(c),  an amount  equal to the sum of (x) all Rent (other
than  Basic  Rent  payable  on and after  the  Termination  Date and other  than
Stipulated  Loss Value) with respect to the  Undivided  Interest in the Facility
due on or prior to such Termination  Date plus (y) all documented  out-of-pocket
cost and expenses incurred by the Lessor or Owner Participant as a result of the
exercise  by the Lessee of its right to  terminate  the Lease  pursuant  to this
Section  12(a)  (other than as a result of the  Lessor's  election to retain the
Facility),  whereupon the Lease Term and, except as expressly otherwise provided
herein or therein,  the  obligations  of the Lessee and HCNA to the Lessor under
this Lease and any other Operative  Documents,  including the obligations of the
Lessee  to pay  Basic  Rent on each  Basic  Rent  Payment  Date on or after  the
Termination  Date,  shall  terminate and the Owner  Participant  shall  promptly
surrender  any  Letters  of  Credit  to the  issuer  thereof  for  cancellation;
provided,  however,  if the conditions set forth in clauses (i) and (ii) of this
Section 12(a) shall not have  occurred on or as of the  Termination  Date,  this
Lease and all other Operative  Documents shall continue in full force and effect
as to the Undivided  Interest in the Facility and Lessee shall be deemed to have
revoked its Termination Notice.

                  (b) Sale of Undivided Interest. Upon delivery of a Termination
Notice and until Lessor  notifies  Lessee in accordance  with the  provisions of
Section  12(a) of  Lessor's  election  to retain the  Undivided  Interest in the
Facility,  Lessee as  non-exclusive  agent for Lessor,  shall use its commercial
best  efforts to obtain bids for the purchase of the  Undivided  Interest in the
Facility and, in the event it receives any bid, Lessee shall promptly certify to
Lessor in writing the amount and terms of such bid,  the  proposed  date of such
sale and the name and  address of the party or parties  (who shall not be Lessee
or any  Affiliate of Lessee but who may be any Affiliate of Lessor or any Person
contacted by Lessor)  submitting such bid. The Owner  Participant shall have the
right,  but not the  obligation to obtain bids for the purchase of the Undivided
Interest in the  Facility  and shall  promptly  notify  Lessee of each such bid.
Unless no bid shall have been received, if Lessor elected, or was deemed to have
elected, to sell the Undivided Interest in the Facility, then on the Termination
Date and upon  payment by Lessee of (x) all Rent (other than Basic Rent  payable
on and after the  Termination  Date and other than  Stipulated  Loss Value) with
respect to the Undivided Interest in the Facility due on or prior to


                                       19

<PAGE>



such Termination Date plus (y) the excess,  if any, of (A) Stipulated Loss Value
for the Undivided Interest in the Facility, computed as of the Termination Date,
plus any Break Costs of the Owner  Participant,  over (B) the sales price of the
Undivided  Interest in the Facility  received by Lessor plus (z) all  documented
out-of-pocket  costs and expenses incurred by the Lessor or Owner Participant as
a result of the  exercise  by the  Lessee of its  right to  terminate  the Lease
pursuant  to this  Section  12(a)  or the  sale of the  Facility  in  connection
therewith,  (1) Lessee shall deliver the  Undivided  Interest in the Facility to
the bidder that  submitted  the highest bid  therefor,  in the same manner as if
delivery  were made to Lessor  pursuant  to Section  10(a) and (2) Lessor  shall
simultaneously therewith sell all of its right, title and interest in and to the
Undivided  Interest in the Facility  (together with Lessor's Contract Rights and
all rights of Lessor  under the Site Lease,  the License and the  Easement)  for
cash in U.S. dollars to such bidder free and clear of Lessor Liens and otherwise
on an "as is, where is" basis (the total selling price  realized at such sale to
be retained by Lessor); provided,  however, that no such sale shall occur unless
on or prior to the  Termination  Date  Lessee  shall have  obtained  the express
written  consent of the Power Purchaser or the Power Purchase  Agreements  shall
have been terminated.

                  (c)  Revocation;  Termination.  If no  such  sale  shall  have
occurred on or as of the  Termination  Date (either as a result of no bid having
been received or otherwise),  this Lease shall continue in full force and effect
as to the Undivided Interest in the Facility (and Lessee shall be deemed to have
revoked  its  Termination  Notice).  In the  event  of any  such  sale  and upon
compliance  by  Lessee  with the  provisions  of this  Section  12 with  respect
thereto,  the Lease Term and, except as expressly  otherwise  provided herein or
therein,  the  obligations of the Lessee and HCNA to the Lessor under this Lease
and any other  Operative  Documents,  including the obligations of the Lessee to
pay Basic Rent on each Basic Rent Payment Date on or after the Termination Date,
shall terminate and Owner  Participant  shall promptly  surrender any Letters of
Credit to the issuer thereof for cancellation.  Lessor shall be under no duty to
solicit  bids, to inquire into the efforts of Lessee to obtain bids or otherwise
take  any  action  in  connection  with  any such  sale  other  than to sell the
Undivided  Interest in the Facility  (in  accordance  with the last  sentence of
Section 12(b)) to the purchaser  named in the highest bid certified by Lessee to
Lessor against receipt of the payments provided for herein.  Except as expressly
provided for in this Section 12, any termination of this Lease as above provided
shall not affect the  obligation of Lessee to make payments of Rent provided for
herein in respect of matters arising prior to or upon such  termination.  Lessee
may revoke any Termination  Notice at any time up to six (6) months prior to the
Termination  Date  (whether  or not Lessor has given  notice of its  election to
retain the Undivided Interest in the Facility);  provided, that Lessee shall not
be  permitted to revoke more than two (2)  Termination  Notices  (including  any
deemed revocation  thereof).  At the time when Lessee's Termination Notice shall
no longer be subject to revocation in accordance with this Section 12(c), Lessee
shall promptly provide Lessor with reasonable  assurances of Lessee's ability to
make all payments  required to be made by Lessee in connection with its exercise
of the  termination of this Lease as above  provided,  after taking into account
any proceeds that can reasonably be expected from the sale of the Facility.



                                       20

<PAGE>



                  Section 13. Event of Loss;  Repair;  Regulatory Event of Loss.
(a) Notice of an Event of Loss. If an Event of Loss shall occur during the Lease
Term with respect to the Undivided  Interest in the Facility,  Lessee shall give
Lessor prompt written notice thereof.

                  (b)  Purchase of Facility  Upon Event of Loss.  Following  the
occurrence  of an Event of Loss,  Lessee  shall pay to Lessor on or prior to the
earlier of (x) the fifth  Business  Day  following  receipt of any  requisition,
condemnation  or insurance  proceeds paid in connection  with such Event of Loss
and (y)  three  (3)  months  following  the Event of Loss Date (the date of such
payment,  the "SLV Payment  Date") the sum of the following  (the "Event of Loss
Purchase Price"):  (i) the Stipulated Loss Value for the Facility computed as of
the Determination Date on or immediately  preceding the Event of Loss Date, plus
(ii) interest on the sum of the amount in clause (i) from the Determination Date
to the SLV Payment Date at the Overdue Interest Rate, plus (iii) all unpaid Rent
due in accordance with the terms of this Lease on or before the SLV Payment Date
(other than Basic Rent,  if any,  due and payable on or after the  Determination
Date).  Such  Event of Loss  Purchase  Price  shall be paid to Lessor on the SLV
Payment  Date.  Upon  payment  in full of such  Event  of Loss  Purchase  Price,
together with all documented  out-of-pocket  costs and expenses  incurred by the
Lessor or Owner Participant, (a) the Lessor shall transfer and assign all of its
right,  title and interest in and to the Undivided  Interest in the Facility and
the  Leasehold  Estate to the Lessee or to such  other  Person as the Lessee may
direct,  free and clear of Lessor  Liens and  otherwise  on an "as is, where is"
basis, and Lessor shall execute and deliver one or more bills of sale,  together
with such other  documents  evidencing  such  transfer and  assignment as may be
reasonably  requested  by the  Lessee  in  order to  effect  such  transfer  and
assignment  and (b) (i) the  Lease  Term  and,  except  as  expressly  otherwise
provided herein or therein, the obligations of the Lessee and HCNA to the Lessor
under this Lease and any other Operative Documents, including the obligations of
the Lessee to pay Basic Rent on each  Basic  Rent  Payment  Date on or after the
Determination  Date, shall terminate and (ii) Owner  Participant  shall promptly
surrender any Letters of Credit to the issuer thereof for cancellation.

                  (c)  Repair.  Following  the  occurrence  of loss,  damage  or
destruction  to the Facility or the Site not  constituting  an Event of Loss (x)
Lessee  shall make or cause to be made such  repairs as are  necessary to ensure
that the  Facility  and the Site is  repaired  and  restored  prior to the Lease
Termination Date to the value, utility and remaining useful life of the Facility
that  existed  prior  to  such  occurrence  (assuming  the  Facility  was in the
condition  required by this Lease),  in compliance with Sections 7(b) and (y) of
this Lease shall continue,  and each and every  obligation of Lessee  hereunder,
including,  without limitation, the obligation to pay Rent, and under each other
Operative Document shall remain in full force and effect.

                  (d)  Application  of  Payments  on an Event of Loss.  Payments
received by Lessor (other than proceeds of insurance  carried by Lessor pursuant
to Section  9(g)) or Lessee from any  insurer,  governmental  authority or other
Person as a result of an Event of Loss with respect to the Undivided Interest in
the Facility,  the Easement Site or the Site shall be applied as follows: (x) so
much of such  payments as shall not exceed the amount of  Stipulated  Loss Value
and the other  amounts  required to be paid by Lessee  pursuant to Section 13(b)
shall be paid to and


                                       21

<PAGE>



applied in reduction of Lessee's  obligation  to pay such amounts if not already
paid by Lessee in full or, if already  paid by Lessee in full,  shall be applied
to reimburse  Lessee for its payment of such amounts,  and (y) any such payments
that shall exceed the  aggregate of the amounts  payable  pursuant to clause (x)
above shall be divided among Lessee and Lessor as their interests may appear.

                  (e)  Application of Payments Not Relating to an Event of Loss.
Unless a  Material  Default or an Event of Default  shall have  occurred  and be
continuing (in which case all payments  described in this Section 13(e) shall be
invested in  accordance  with  Section 26 until  released to Lessee or otherwise
applied in accordance with the terms hereof),  payments  received at any time by
Lessor or Lessee from any insurer,  governmental  authority or other Person with
respect  to any  loss,  condemnation,  confiscation,  theft or  seizure  of,  or
requisition of title to or use of, or damage to, the Facility, the Easement Site
or the Site or any part thereof not  constituting  an Event of Loss will be paid
to or  retained  by Lessor and will be applied in  accordance  with the terms of
Section 9(f) in the same manner as the  insurance  proceeds  referred to in said
Section  (except that  condemnation  proceeds  received from any Authority  that
remain  following  completion of Restoration of the Facility in accordance  with
Section  9(f) shall be divided  among Lessee and Lessor as their  interests  may
appear).

                  (f) Regulatory  Events of Loss. (i) If an OP Regulatory  Event
of Loss or a Lessee  Regulatory  Event of Loss  occurs or is  threatened,  Owner
Participant  (with  respect to an OP  Regulatory  Event of Loss) or Lessee (with
respect to a Lessee  Regulatory Event of Loss),  shall promptly notify the other
and take,  or cause to be taken,  such  action  as may be  necessary  to void or
nullify the OP Regulatory  Event of Loss or Lessee  Regulatory Event of Loss, as
applicable,  or  otherwise  to mitigate  in all  material  respects  the effects
thereof,  including (A) expending such sums as may be necessary to void, nullify
or mitigate in all  material  respects the effects of such  Regulatory  Event of
Loss, and (B) if necessary,  selling or otherwise  disposing of all or a portion
of, Lessor's,  Lessee's or Owner Participant's  interest in the Facility, as the
case may be. All such actions shall be taken prior to the date of the occurrence
or scheduled  occurrence of such Regulatory Event of Loss or as soon as possible
thereafter; provided, however, that no Person shall be required to take any such
action after the date of any  transfer  pursuant to Section  13(f)(iii)  or (iv)
hereof.

                  (ii) If any Regulatory  Event of Loss occurs or is threatened,
Lessor (subject to Section 13(f)(iv) hereof), Lessee and Owner Participant shall
cooperate in good faith to void or nullify such  Regulatory  Event of Loss or to
otherwise  mitigate in all  material  respects  the effects  thereof;  provided,
however,  neither  Lessor,  Lessee nor Owner  Participant  shall be obligated to
incur any  significant  expenses  (except as otherwise  provided in this Section
13(f)).

                  (iii) In the event of an Other  Regulatory  Event of Loss that
has not been voided or nullified,  or the effect of which has not been mitigated
in all material  respects,  or, in the case of a Lessee Regulatory Event of Loss
that has not been  voided  or  nullified,  or the  effect  of which has not been
mitigated in all material respects,  notwithstanding  the Lessee's obligation to
void,  nullify or mitigate in all material  respects the effects  thereof  under
Section 13(f)(i),


                                       22

<PAGE>



Lessee shall purchase the Undivided Interest in the Facility on an "as is, where
is"  basis,  without  warranty,  but free of Lessor  Liens  effective  as of the
Determination  Date that most  immediately  precedes the date of the  applicable
Regulatory  Event of Loss (the  "Regulatory SLV Payment Date"),  at a price (the
"Regulatory  Purchase  Price") equal to the greater of (A) the  Stipulated  Loss
Value as of the  Regulatory  SLV Payment  Date,  and (B) the Fair  Market  Sales
Value,  determined  as of the  Regulatory  SLV  Payment  Date  by the  Appraisal
Procedure.  Owner Participant's rights under the Power Purchase  Agreements,  at
the time of such  purchase,  shall be free and clear of Lessor Liens and, to the
extent within the control of Lessor or Owner Participant, be returned to Lessee.

                  (iv) In connection  with a purchase of the Undivided  Interest
in the Facility by Lessee  pursuant to Section  13(i)(iii),  Lessee shall pay to
Lessor the following additional amounts on the Regulatory SLV Payment Date:

                  (A)  any  unpaid  Basic Rent due prior to the  Regulatory  SLV
         Payment Date; plus

                  (B)  all documented  out-of-pocket  costs and expenses payable
         by Lessor or Owner  Participant as a result of such Regulatory Event of
         Loss; plus

                  (C)  any due and unpaid Supplemental Rent and any other amount
         due and payable on, or relating to, the obligations of Lessee to Lessor
         or Owner Participant under any of the Operative  Documents that remains
         unpaid on the  Regulatory  SLV Payment  Date;  whereupon the Lease Term
         and,  except as expressly  otherwise  provided  herein or therein,  the
         obligations  of the Lessee and HCNA to the Lessor  under this Lease and
         any other Operative Documents,  including the obligations of the Lessee
         to pay  Basic  Rent on each  Basic  Rent  Payment  Date on or after the
         Termination  Date,  shall  terminate  and the Owner  Participant  shall
         promptly  surrender  any  Letters of Credit to the issuer  thereof  for
         cancellation.

                  In the  event of an OP  Regulatory  Event of Loss that has not
been voided or nullified,  or the effect of which has not been  mitigated in all
material respects within a reasonable period of time before the date on which it
becomes  effective,  Owner  Participant shall have the option to cause Lessor to
transfer  title to its  Undivided  Interest  in the  Facility  to Lessee  and to
convert the Lease into a secured  loan,  with the  remaining  Basic Rent payable
under the Lease being  re-characterized  as payment of principal and interest on
such  loan.  Lessee  agrees  to take all  such  actions,  and  enter  into  such
documents,  agreements and instruments, as may be reasonably requested by Lessor
in order to effect such  transfer  and such  re-characterization  and to provide
Lessor with a first priority security interest in the Undivided  Interest in the
Facility.

                  Section 14. No Interest  Conveyed to Lessee.  This Lease is an
agreement of lease and does not convey to Lessee any right, title or interest in
or to the  Undivided  Interest in the Facility  except as a lessee and except as
may be available to Lessee under Sections 12(b), 13(b), 13(f) and 21.



                                       23

<PAGE>



                  Section 15. Sublease; Location. (a) Assignment;  Sublease. (i)
So long as no Event of Default shall have occurred and be continuing at the time
an Assignment or a Sublease (each, as defined below) is entered into and so long
as such  Assignment or Sublease does not cause Owner  Participant  to suffer any
adverse tax  consequences for which no indemnity is provided under the Operative
Documents,  Lessee may, without prior consent of Lessor,  assign its interest in
the Lease ("Assignment") or sublease its interest in the Facility or any portion
thereof ("Sublease") to any Approved Sublessee.  Lessee shall give Lessor prompt
notice upon  entering into any such  Assignment or Sublease.  Except as provided
above  or as  provided  in  Section  6.1 or  Section  6.2  of the  Participation
Agreement,  Lessee  may not  assign its  interest  in the Lease (or any  portion
thereof) or sublease its interest in the Facility or any portion  thereof to any
other Person  without the prior written  consent of Lessor,  which consent shall
not be unreasonably withheld.

                  (ii) The assignee in connection with any Assignment  permitted
by this Section  15(a) shall enter into a written  agreement  for the benefit of
Lessor  pursuant to which it shall  expressly  assume all  obligations of Lessee
under this Lease and other Lease  Financing  Documents  and which shall  contain
representations and warranties as to validity, due authorization, enforceability
and such  other  matters  as may be  reasonably  requested  by  Lessor.  No such
Assignment shall in any way diminish or discharge any of Lessee's obligations to
Lessor or constitute a waiver of any of Lessor's rights or remedies hereunder.

                  (iii) The rights of any Person who receives possession under a
Sublease permitted by this Section 15(a) shall be subject and subordinate to all
the terms of this Lease (and any such Sublease shall be made  expressly  subject
and subordinate to all the  restrictions  and other terms of this Lease and such
Person shall have no right to further Sublease),  including, without limitation,
Lessor's  rights to exercise  remedies under Section 18 (including  re-entry and
repossession of the Undivided Interest in the Facility).  No such Sublease shall
in any way  discharge  or  diminish  any of  Lessee's  obligations  to Lessor or
constitute a waiver of any of Lessor's rights and remedies hereunder.  Each such
Sublease shall be evidenced by a written  agreement  providing for the sublessee
to be bound by all the terms of this Lease. In addition, any such Sublease shall
expire no later  than the last day of the Basic  Term and,  except  for any such
Sublease  with a term of less  than one  year,  shall be  assigned  to Lessor as
collateral  security  for  Lessee's  obligations  under this Lease and the other
Operative  Documents  and shall be subjected to the lien of the Lessor  Security
Agreement.

                  (iv) In addition  to the other  requirements  of this  Section
15(a),  any  permitted  Sublease  entered  into  with  a  Person  that  is not a
Restricted  Subsidiary of Lessee or, so long as HCNA  Guaranty is in effect,  of
HCNA shall be on commercially reasonable, arm's length terms and conditions.

                  Section 16. Inspection and Reports. (a) Inspection. During the
Lease Term and absent an Event of Default,  Lessor,  Owner Participant and their
authorized  representatives  and  designees  may, at their own  expense,  during
Lessee's  normal  business  hours and upon  reasonable  prior  notice to Lessee,
inspect the Facility, the Easement Site and the Site and the


                                       24

<PAGE>



books and records of Lessee relative thereto  (including any documents  relating
to compliance with  Environmental  Laws) in Lessee's  custody or to which Lessee
has  access   (subject,   in  each  event,  to  Applicable  Law  and  applicable
confidentiality undertakings with respect to proprietary information pursuant to
Section  9.6 of the  Participation  Agreement),  and make  copies  and  extracts
therefrom  (other than copies of and extracts from  engineering,  processing and
other  proprietary  data and  information  unless such  copies or  extracts  are
subject to the foregoing confidentiality undertakings), and may discuss Lessee's
operations, affairs, finances and accounts with its Responsible Officers and, in
consultation with a Responsible  Officer of Lessee,  with its independent public
accountants.  Lessor  shall  not have any duty to make any such  inspection  and
shall not incur any  liability  or  obligation  by reason of not making any such
inspection.  Inspections  shall be conducted  so as not to interfere  materially
with the  operation of the Facility or the conduct by the Lessee of its business
and shall be subject to appropriate safety restrictions and precautions.  If the
inspections  are  conducted  during  an  Event  of  Default,  Lessee  shall  pay
reasonable out-of-pocket expenses incurred by Lessor and Owner Participant.

                  (b) Environmental  Inspection.  During the Lease Term, Lessor,
Owner Participant and Owner Trustee and their agents, employees, contractors and
representatives,  upon reasonable prior notice and at all reasonable  times, may
enter the Facility,  the Easement Site and the Site to undertake any  reasonable
environmental  inspection and monitoring thereof (including  conducting invasive
soil borings and other customary invasive  environmental tests,  assessments and
sampling),  provided  that such  parties (i) shall,  if  requested in writing by
Lessee, undertake any invasive inspection or monitoring through an Environmental
Consultant,  which consultant shall be reasonably acceptable to Lessee and which
consultant  shall  provide  for the  benefit of Lessee  standard  and  customary
indemnification for errors and omissions for preferred clients, but only if such
indemnification  is  commercially  and  reasonably  available,  (ii)  shall  not
undertake any invasive  testing except upon the prior  submission to Lessee of a
sampling  plan,  which plan shall be subject to Lessee's  reasonable  and prompt
approval, (iii) shall have no duty to conduct such activities, (iv) shall comply
with applicable  Environmental  Laws in the conduct of such activities,  and (v)
shall use reasonable  efforts to minimize  interference  with the business being
conducted at the Facility, the Easement Site and the Site.

                  (c) Reports. To the extent  permissible,  Lessee shall prepare
and file in timely  fashion or, where Lessor shall be required to file,  prepare
and deliver to Lessor within a reasonable time prior to the date for filing, any
material reports with respect to the condition or operation of the Facility, the
Easement  Site and the Site  during any period  included in the Lease Term which
are required to be filed with any Authority.

                  Section 17.  Events of Default.  The  following  events  shall
constitute  Events of Default  (whether  any such event  shall be  voluntary  or
involuntary  or come about or be effected by  operation of law or pursuant to or
in compliance with any judgment, decree or Order of any Authority):



                                       25

<PAGE>



                  (a)  Lessee  shall fail to make any  payment of Interim  Rent,
         Basic Rent or  Stipulated  Loss Value or amounts  payable  pursuant  to
         Sections  12, 13 or 21 within  five (5)  Business  Days  after the same
         shall have become due; or

                  (b)  Lessee   shall   fail  to  make  any  other   payment  of
         Supplemental  Rent or any other amount  payable  hereunder or under any
         Lease Financing  Document or Facility Document within ten (10) Business
         Days after receipt by the Lessee of written notice of such failure from
         Lessor or Owner Participant describing such failure; or

                  (c)  Lessee or HCNA  shall  fail to  perform or observe in any
         material  respect any covenant,  condition or agreement to be performed
         or  observed  by it  under  (other  than  any  covenant,  condition  or
         agreement  that is the subject of any other  subsection of this Section
         17) any  Lease  Financing  Document  and such  failure  shall  continue
         unremedied  for a period of thirty (30) days after Lessee or HCNA shall
         have  received   written  notice  from  Lessor  or  Owner   Participant
         describing  such  failure;  provided,  that  the  continuation  of such
         failure for thirty (30) days or longer shall not constitute an Event of
         Default if Lessee or HCNA is diligently proceeding to cure such failure
         and such failure shall be cured within two hundred ten (210) days after
         Lessee or HCNA shall have received  such written  notice from Lessor or
         Owner Participant describing such failure; or

                  (d)  Lessee or HCNA  shall  fail to  perform or observe in any
         material  respect any covenant,  condition or agreement to be performed
         or  observed by it under any  Facility  Document to which it is a party
         (other than any covenant, condition or agreement that is subject to any
         other  subsection of this Section 17) and such failure  shall  continue
         unremedied  until  the  earlier  to  occur  of  the  expiration  of all
         applicable  cure periods  contained in such  Facility  Document and 180
         days after notice to Lessee or HCNA from Lessor or Owner Participant of
         such failure; or

                  (e) any  representation  or warranty made by Lessee or HCNA in
         any of the Lease Financing Documents to which it is a party (other than
         in the Tax  Indemnity  Agreement),  or made to the  Owner  Participant,
         Owner  Trustee  or Power  Contract  Trustee in any  statement,  report,
         schedule,  notice or other writing furnished by Lessee or HCNA pursuant
         to the Lease Financing Documents, shall prove to have been incorrect in
         any  material  respect at the time made and shall  remain  material and
         uncured or  uncorrected  for a period of thirty (30) days after  Lessee
         shall have  received  written  notice from Lessor or Owner  Participant
         describing such incorrect representation or warranty; or

                  (f)  Lessee  or HCNA  commences  a  voluntary  case  or  other
         proceeding seeking liquidation,  reorganization or other similar relief
         with respect to itself or its debts under any bankruptcy, insolvency or
         other similar law now or hereafter in effect or seeking the appointment
         of a trustee, receiver, liquidator, custodian or other similar official
         of it or any substantial part of its property,  or consents to any such
         relief  or to the  appointment  of or  taking  possession  by any  such
         official in an involuntary case or other proceeding


                                       26

<PAGE>



         commenced against it, or makes a general  assignment for the benefit of
         creditors,  or fails  generally to pay its debts as they become due, or
         takes any  corporate  action to authorize  any of the  foregoing or the
         equivalent thereof; or

                  (g) an  involuntary  case or  other  proceeding  is  commenced
         against  Lessee or HCNA seeking  liquidation,  reorganization  or other
         similar  relief with  respect to it or its debts under any  bankruptcy,
         insolvency  or other  similar law now or hereafter in effect or seeking
         the appointment of a trustee, receiver, liquidator,  custodian or other
         similar  official of it or any  substantial  part of its property,  and
         such  involuntary  case or other  proceeding  remains  undismissed  and
         unstayed for a period of ninety (90) consecutive  days; or an order for
         relief  is  entered  against  Lessee  or  HCNA  under  any  bankruptcy,
         insolvency or other similar law as now or hereafter in effect; or

                  (h) Lessee shall fail to maintain the insurance required to be
         maintained pursuant to Section 9; or

                  (i) for any reason the Site Lease,  the Easement,  the License
         or HCNA Guaranty shall become invalid or otherwise unenforceable; or

                  (j) Lessee shall permit any Lien (other than a Permitted Lien)
         to exist on or with  respect to the  Facility,  the Site,  the Easement
         Site, a Service  Facility or the Owner Trustee's rights under the Power
         Purchase  Agreements  and such Lien shall remain for a period of thirty
         (30) days after Lessee shall have received  written  notice from Lessor
         as to the existence of such Lien; or

                  (k) a default shall have occurred under any  Indebtedness  (as
         such  term is  defined  in the  Credit  Agreement  as in  effect on the
         Closing  Date  without  regard to  whether  or not the same is still in
         effect) of the Lessee or HCNA,  the then principal  outstanding  amount
         outstanding of which is more than $20 million,  which default (i) shall
         constitute a failure to pay any regularly  scheduled  payment  (whether
         principal, interest or otherwise) when due, after the expiration of any
         applicable  grace  period with respect to such  payment,  or (ii) shall
         have  resulted in such  obligation  becoming or being  declared due and
         payable prior to the date on which it would  otherwise  have become due
         and payable; or

                  (l) a final  judgment  or  final  judgments  (not  subject  to
         appeal) for the payment of money are entered against the Lessee or HCNA
         in an  aggregate  amount in excess of $7.5 million by a court or courts
         of  competent   jurisdiction,   which  judgment  or  judgments   remain
         undischarged  for  a  period  (during  which  execution  shall  not  be
         effectively  stayed) of sixty (60) days after the right to appeal  such
         judgment or judgments has expired; or

                  (m) Lessee shall fail to maintain the Letter of Credit or Cash
         Deposit as required by Section 6.1(i) of the  Participation  Agreement;
         or



                                       27

<PAGE>



                  (n) If at any time Lessee shall have provided  Lessor with the
         Cash Deposit and the Lessor  Security  Agreement shall be repudiated or
         for any other  reason  shall fail to be in full force and effect or the
         Lien of the Lessor Security  Agreement shall terminate,  cease to be in
         effect or lose its  priority  other than as a result of the  actions of
         Lessor or Owner Participant,  except as required by the Lease Financing
         Documents,  in  each  case  except  as  expressly  contemplated  by the
         Operative Documents; or

                  (o) HCNA shall  fail to  perform  or  observe in any  material
         respect  any  covenant,  condition  or  agreement  to be  performed  or
         observed by HCNA, under Section 6.2(d) of the Participation  Agreement,
         and such failure shall continue  unremedied  upon the expiration of all
         applicable cure periods contained in such Section; or

                  (p) a default in the performance, or breach, (x) by Lessee, of
         Section 6.1 (a)(iv) or 6.1(b)(ii) of the Participation Agreement or (y)
         by  HCNA,  of  Section  6.2(h)  or  6.3(a)(ii)  of  the   Participation
         Agreement.

                  Section 18. Remedies. (a) Remedies. Upon the occurrence of any
Event  of  Default  and at any  time  thereafter  so long as the  same  shall be
continuing,  Lessor at its  option  may,  (x) if such Event of Default is of the
type described in Section 17(f) or (g), without notice,  and (y) with respect to
any other  Event of  Default by notice to Lessee  declaring  this Lease to be in
default,  exercise one or more of the following remedies,  except as hereinbelow
expressly otherwise set forth, as Lessor in its sole discretion shall elect:

                      (i) Lessor  may (x)  demand  that  Lessee,  and  thereupon
         Lessee shall, at Lessee's  expense,  return possession of the Undivided
         Interest in the Facility and of the Leasehold Estate promptly to Lessor
         in the manner and  condition  required by, and  otherwise in accordance
         with the provisions of, Sections 10(a) and 10(b), and without prejudice
         to any  other  remedy  which  Lessor  may  have for  possession  of the
         Undivided  Interest  in the  Facility  and of the  Leasehold  Estate or
         arrearages in Rent or (y) take all action required to enable Lessor to,
         and thereafter, enter upon the Leasehold Estate and take possession (to
         the exclusion of Lessee) of the Undivided  Interest in the Facility and
         of the Leasehold Estate and expel or remove Lessee and any other Person
         who may be  occupying  the  Undivided  Interest in the Facility and the
         Leasehold Estate or any part thereof,  all without  liability to Lessee
         or any  other  Person  for or by  reason  of such  entry or  taking  of
         possession, whether for the restoration of damage to property caused by
         such taking or otherwise;

                     (ii) Lessor may sell the Undivided Interest in the Facility
         or any part  thereof,  together  with any  interest of Lessor under the
         Argus  Utility Bill of Sale,  Argus Utility Deed of  Improvements,  the
         Easement,  the License and the Site Lease,  at public or private  sale,
         conducted in accordance  with  applicable law, as Lessor may determine,
         free and clear of any rights of Lessee  therein and without any duty to
         account to Lessee with respect to such sale or for the proceeds thereof
         (except  to the extent  required  by clause (v) or (vi) below if Lessor
         shall elect to exercise its rights thereunder), in which event


                                       28

<PAGE>



         Lessee's  obligation  to pay Basic Rent with  respect to the  Undivided
         Interest in the Facility or the part thereof that has been sold, as the
         case may be, for periods  commencing  after the date of such sale shall
         terminate  (except to the extent  that Basic Rent is to be  included in
         computations  under  clause (v) or (vi) below if Lessor  shall elect to
         exercise its rights thereunder);

                    (iii) Lessor may elect to retake possession of the Undivided
         Interest in the Facility and of the Leasehold Estate and relet the same
         for the benefit of Lessor without terminating this Lease, in which case
         Lessee will be liable for and will pay to Lessor all  amounts  required
         to be paid by Lessee  during  the  remainder  of the Lease Term as said
         amounts accrue  hereunder until the expiration of Lease Term diminished
         by any net sums  received by Lessor  through  reletting  the  Undivided
         Interest in the Facility and the  Leasehold  Estate  during such period
         (after  deducting  all  reasonable   expenses  incurred  by  Lessor  in
         connection with such  reletting);  it being  understood and agreed that
         actions to collect  amounts  due by Lessee as  provided  in this clause
         (iii)  may be  brought  from  time to  time  on one or more  occasions,
         without the necessity of Lessor  waiting until  expiration of the Lease
         Term;

                     (iv) Lessor may elect to retake possession of the Undivided
         Interest in the  Facility  and of the  Leasehold  Estate and retain the
         Undivided Interest in the Facility and the Leasehold Estate for its own
         benefit, in which case Lessee will be liable for and will pay to Lessor
         damages  in an amount  equal to the amount  specified  in clause (C) of
         Section 18(a)(v) below;

                      (v) Lessor may, whether or not Lessor shall have exercised
         or shall  thereafter  at any time exercise its rights under clause (i),
         (ii), (iii) above, by notice to Lessee specifying a payment date (which
         payment date shall be a Determination  Date), demand that Lessee pay to
         Lessor,  and Lessee shall pay to Lessor,  on the date specified in such
         notice one of the following amounts as liquidated damages for loss of a
         bargain  and not as a penalty  (in lieu of the Basic Rent due after the
         date specified in such notice),  in accordance  with  California  Civil
         Code Section 1671 (it being  agreed that it would be  impracticable  or
         extremely difficult to fix the actual damages),  any unpaid Rent due as
         of and through  the date  specified  in such  notice  (other than Basic
         Rent, if any, due on or after such  Determination  Date) plus whichever
         of the following amounts Lessor, in its sole discretion,  shall specify
         in such notice  (together with interest on any overdue  portion of such
         amount  at the  Overdue  Interest  Rate  from  the  Determination  Date
         specified in such notice to the date of actual payment):

                           (A) an amount  equal to the  excess,  if any,  of (1)
                  Stipulated Loss Value,  computed as of the Determination  Date
                  specified  in such  notice,  over (2) the Fair  Market  Rental
                  Value of the Undivided Interest in the Facility (determined on
                  the basis of the then actual  condition of the  Facility)  for
                  the  remainder of the Lease term after  discounting  such Fair
                  Market Rental Value semiannually to present


                                       29

<PAGE>



                  value as of the date  specified  in such notice at the rate of
                  seven percent (7%) per annum; or

                           (B) an amount equal to the excess, if any, of (1) the
                  Stipulated  Loss Value computed as of the  Determination  Date
                  specified  in such notice over (2) the Fair Market Sales Value
                  of the Undivided  Interest in the Facility  (determined on the
                  basis of the then actual  condition of the Facility) as of the
                  payment date specified in such notice; or

                           (C) an amount equal to the excess, if any, of (1) the
                  present value as of the payment date  specified in such notice
                  of all  installments  of Basic Rent until the end of the Basic
                  Term or the then  current  Renewal  Term,  as the case may be,
                  discounted  semiannually  at the Discount  Rate,  over (2) the
                  present  value as of such date of the Fair Market Rental Value
                  of the Undivided  Interest in the Facility  (determined on the
                  basis of the then actual  condition of the Facility) until the
                  end of the Basic Term or such  Renewal  Term,  as the case may
                  be, discounted semiannually at the Discount Rate;

                           (D) an amount  equal to the higher of the  Stipulated
                  Loss Value computed as of the Determination  Date specified in
                  such  notice or the Fair Market  Sales Value of the  Undivided
                  Interest in the Facility as of the payment  date  specified in
                  such notice;

         and, in the case of (A), (B), (C) and (D) above, upon payment by Lessee
         of all amounts  payable by it hereunder  and under the other  Operative
         Documents,  (x) unless Lessor shall have sold the Undivided Interest in
         the  Facility  in  accordance  with the terms  hereof and given  Lessee
         appropriate   credit   therefor  in  calculating   liquidated   damages
         hereunder, Lessor shall transfer and assign all of its right, title and
         interest  in and to the  Undivided  Interest  in the  Facility  and the
         Leasehold Estate together with all rights of Lessor under the Easement,
         the  License  and the Site  Lease to Lessee,  or such  Person as Lessee
         shall  designate,  on an "as is,  where  is"  basis,  free and clear of
         Lessor Liens, and Lessor shall execute and deliver one or more bills of
         sale,  together with such other documents,  as necessary to effect such
         transfer and assignment  (including  any licenses or permits  necessary
         for  operation  and use of the  Facility)  and (y) the Lease  Term and,
         except as expressly otherwise  provided,  the obligations of Lessee and
         HCNA to Lessor under this Lease and the other Operative Documents shall
         terminate and Owner Participant shall promptly  surrender any Letter of
         Credit to the issuer thereof for cancellation;

                     (vi) if Lessor  shall have sold the  Undivided  Interest in
         the  Facility  pursuant to clause (ii)  above,  Lessor,  if it shall so
         elect in lieu of  exercising  its  rights  under  clause (v) above with
         respect to the  Facility by notice to Lessee may demand that Lessee pay
         to Lessor, and Lessee shall pay to Lessor, on the date of such sale, as
         liquidated  damages for loss of a bargain and not as a penalty (in lieu
         of Basic  Rent due for  periods  commencing  after the next  Basic Rent
         Payment Date following the date of such sale), in


                                       30

<PAGE>



         accordance  with  California  Civil Code  Section 1671 (it being agreed
         that it would be impracticable or extremely difficult to fix the actual
         damages),  any unpaid Rent due as of the  Determination  Date following
         the date of such sale (other than Basic Rent due on and after,  but not
         prior to, such  Determination  Date), plus the amount of any deficiency
         between the sale  proceeds and  Stipulated  Loss Value,  computed as of
         such Determination Date, together with interest at the Overdue Interest
         Rate  on  the  amount  of  such  Rent  and  such  deficiency  from  the
         Determination Date of such sale until the date of actual payment;

                    (vii) Lessor may rescind or terminate this Lease;  provided,
         however,  that (A) no reentry or taking of  possession of the Undivided
         Interest in the Facility or of the  Leasehold  Estate by Lessor will be
         construed  as an  election  on Lessor's  part to  terminate  this Lease
         unless a  written  notice of such  intention  is given to  Lessee,  (B)
         Lessor  may take  and  perform  any and all  actions  required  for the
         operation,  maintenance or  preservation  of the Facility and the Site;
         provided,  that  in no  event  shall  the  Owner  Trustee's  operation,
         maintenance  or  preservation  of the  Facility  and the Site as herein
         provided be deemed to constitute a termination of this Lease, and until
         this Lease shall have been  terminated as provided in this clause (vii)
         or otherwise,  or by order of any court, Owner Trustee may take any and
         all actions provided for herein or permitted by law without terminating
         this Lease, and this Lease shall continue in full force and effect, (C)
         notwithstanding any reletting, reentry or taking of possession,  Lessor
         may  at any  time  thereafter  elect  to  terminate  this  Lease  for a
         continuing  Event of Default  and (D) no act or thing done by Lessor or
         any of its  agents,  representatives  or  employees  shall be deemed an
         acceptance of a surrender of the Undivided  Interest in the Facility or
         the  Leasehold  Estate,  and no agreement  accepting a surrender of the
         Undivided  Interest in the Facility or of the Leasehold Estate shall be
         valid unless the same be made in writing and executed by Lessor;

                   (viii) in the event that this Lease is  terminated  or in the
         event that Lessor  elects to exercise its  remedies  pursuant to clause
         (iii) or (iv)  above,  Lessor  shall be  entitled  to collect  all Rent
         (other  than that  portion of Basic Rent,  if any,  payable in advance)
         which is due and owing as of the date of the  termination  of the Lease
         or Lessor's  retaking of possession  of the  Undivided  Interest in the
         Facility or of the Leasehold Estate diminished by any net sums received
         by Lessor through reletting the Undivided  Interest in the Facility and
         the Leasehold Estate during such period (after deducting all reasonable
         expenses incurred by Lessor in connection with such reletting);

                     (ix) in the event that this Lease is  terminated  or in the
         event that Lessor  elects to exercise its  remedies  pursuant to clause
         (iii) or (iv) above,  Lessor shall not have any  obligation to relet or
         attempt  to  relet  the  Undivided  Interest  in the  Facility  and the
         Leasehold  Estate or any  portion  thereof,  or to  collect  rent after
         reletting,  and in the event of reletting Lessor may relet the whole or
         any portion of the Undivided Interest in the Facility and the Leasehold
         Estate for any period, to any Person, and for any use and purpose; or


                                       31

<PAGE>




                      (x) Lessor may exercise any other right or remedy that may
         be available to it under applicable law,  including without  limitation
         the  remedies  provided in  California  Civil Code Section  1951.4,  or
         proceed by  appropriate  court action to enforce the terms hereof or to
         recover damages for the breach hereof.

                  (b) No Release. Except as otherwise provided in Section 18(a),
no rescission or termination of this Lease, in whole or in part, or repossession
of the  Undivided  Interest in the  Facility  or  exercise  of any remedy  under
Section 18(a) shall relieve Lessee of any of its  obligations  under this Lease.
In addition, except as otherwise provided herein, Lessee shall be liable for any
and all unpaid  Rent  (other  than Basic Rent  payable on or after the date that
Stipulated Loss Value, or any amount  determined by reference to Stipulated Loss
Value, is payable) due hereunder before,  after or during the exercise of any of
the foregoing remedies, including all reasonable legal fees and other reasonable
costs and expenses  incurred by Lessor and by Owner Participant by reason of the
occurrence  of any Event of Default or the  exercise of Lessor's  remedies  with
respect  thereto.  At any sale of the Undivided  Interest in the Facility or any
part thereof  pursuant to this Section 18, Owner  Participant  or Lessor may bid
for and purchase such property.

                  (c)  Remedies  Cumulative.   Except  as  expressly  set  forth
therein,  no remedy under Section  18(a) is intended to be  exclusive,  but each
shall be cumulative and in addition to any other remedy  provided  thereunder or
otherwise  available to Lessor at law or in equity. No express or implied waiver
by Lessor of any Default or Event of Default  hereunder  shall in any way be, or
be  construed  to be, a waiver of any future or  subsequent  Default or Event of
Default.  The  failure  or delay of Lessor in  exercising  any right  granted it
hereunder upon any occurrence of any of the contingencies set forth herein shall
not constitute a waiver of any such right upon the continuation or recurrence of
any such contingency or similar contingencies and any single or partial exercise
of any  particular  right by Lessor  shall not exhaust the same or  constitute a
waiver of any other right provided herein. To the extent permitted by applicable
law,  Lessee hereby  waives any rights now or hereafter  conferred by statute or
otherwise that may require Lessor to sell,  lease or otherwise use the Undivided
Interest  in the  Facility or the  Leasehold  Estate in  mitigation  of Lessor's
damages as set forth in Section 18(a) or that may otherwise  limit or modify any
of Lessor's rights and remedies  provided in this Section 18 except as expressly
provided herein.

                  (d)  Allocation of Basic Rent.  If, for the purpose of Section
18(a)(ii),  it shall  become  necessary  to allocate a portion of the Basic Rent
payable  hereunder to any part of the Facility,  such allocation shall be in the
same  proportion as the value of such Part on the Closing Date (or, if purchased
after the Closing Date, the original cost of such Part) bears to Lessor's Cost.

                  Section 19.  Right to Perform  for  Lessee.  If at any time an
Event of  Default  shall have  occurred  and be  continuing,  Lessor at its sole
discretion,  but without any  obligation may (i) enter the Easement Site and the
Site to perform the  covenant or  obligation  that Lessee  failed to perform and
that gave rise to such Event of Default and (ii) make the payments necessary to


                                       32

<PAGE>



comply  with such  agreement.  The amount of such  payment and the amount of the
reasonable  expenses of Lessor  incurred in connection  with such payment or the
performance of or compliance with such  agreement,  as the case may be, together
with interest thereon at the Overdue Interest Rate, shall be deemed Supplemental
Rent, payable by Lessee upon demand.

                  Section 20. Renewal Terms. (a) Exercise of Renewal Options. If
(x) with respect to the Fixed Rate Renewal  Term,  no Material  Event of Default
shall have occurred and be continuing or (y) with respect to a Fair Market Value
Renewal Term, no Event of Default shall have occurred and be continuing,  Lessee
shall have the right,  upon  compliance  with the notice  procedure set forth in
Section  22, to renew this Lease at the end of the Basic Term for one Fixed Rate
Renewal Term and at the end of each Renewal Term for a Fair Market  Renewal Term
not to exceed  three  Fair  Market  Renewal  Terms in the  aggregate;  provided,
however,  that Lessee shall only be entitled to exercise its right to renew this
Lease for a Renewal Term to the extent that it is exercising  its right to renew
the Other Lease for the same period of time; provided,  further,  however,  that
(i) the Fixed Rate  Renewal  Term shall be for a period of not less than two (2)
years and not more than  fifteen  (15) years to be  determined  not more than 18
months prior to the end of the Basic Term; (ii) the sum of the Interim Term, the
Basic Term and the Fixed Rate Renewal Term shall not exceed eighty percent (80%)
of the useful life of the Facility  measured from the Closing Date determined as
of the end of the Basic Term in accordance with the Appraisal  Procedure,  (iii)
the estimated  fair market value of the Undivided  Interest in the Facility,  at
the end of the Fixed Rate  Renewal Term  (determined  as of the end of the Basic
Term in accordance with the Appraisal Procedure,  without regard to inflation or
deflation  from the  Closing  Date and after  taking  into  account  the  return
condition  contained  in this Lease) will be at least  twenty  percent  (20%) of
Lessor's  Cost,  (iv) any Fair Market  Renewal Term shall not extend  beyond the
earlier of (A) the last date on which the remaining  useful life of the Facility
equals 20% of the remaining  useful life of the Facility as of the  commencement
of such Fair  Market  Renewal  Term,  (B) the last  date on which the  remaining
residual  value  of the  Facility  equals  20% of the  residual  value as of the
commencement  of the Fair Market  Renewal Term and (C) the 30th day prior to the
end of the Site Lease  Term,  and (v) the term of any Fair Market  Renewal  Term
shall be the lesser of two (2) years and eighty  percent  (80%) of the remaining
useful life of the Facility as of the  commencement  of such Fair Market Renewal
Term and no more than five (5) years. Notwithstanding the foregoing, at Lessor's
option,  Lessee's  right to renew the Lease for a Fair Market Renewal Term shall
be  extinguished  if an Event of Default  occurs on the date the  Second  Notice
referred to in Section 22 is given with respect to such Fair Market Renewal Term
or on the date of  expiration  of the  then-current  Renewal  Term or if  Lessor
terminates  the Lease on or prior to the first day of any Renewal  Term based on
the existence of an Event of Default pursuant to Section 18.

                  (b) Rent During  Renewal Term. All of the terms and provisions
of this Lease shall be applicable  during any Renewal  Term,  except that Lessee
shall pay to Lessor as Basic Rent (i) in arrears on each Semiannual Rent Payment
Date during the Fixed Rate  Renewal  Term,  an amount equal to the lesser of (x)
the  semiannual  installment  of the Fair Market  Rental Value of the  Undivided
Interest in the Facility during the Fixed Rate Renewal Term, determined not more
than 18 months before the end of the Basic Term by the  Appraisal  Procedure and
(y) fifty


                                       33

<PAGE>



percent (50%) of the average of the  installments  of Basic Rent payable  during
the Basic Term,  calculated by dividing (A) the sum of all Basic Rent to be paid
during the Basic Term by (B) the number of rent payment periods during the Basic
Term and (ii) in arrears on each  Semiannual  Rent  Payment Date during any Fair
Market Renewal Term, an amount equal to the  semiannual  installment of the Fair
Market Rental Value of the Undivided Interest in the Facility during the Renewal
Term  determined not more than eighteen (18) months before the  commencement  of
such Renewal Term by the Appraisal  Procedure ; provided,  however,  that during
the Fixed Rate  Renewal Term no such Basic Rent shall be due with respect to the
first two (2) years of such Fixed Rate Renewal Term.

                  (c) Stipulated Loss Value During Renewal Term.  Promptly after
the Lessee's election to renew this Lease pursuant to Section 20(a), Schedule IV
shall  be  modified  by  Owner  Participant  in order  to  provide  for  monthly
Stipulated Loss Values  applicable  during the Renewal Term. The Stipulated Loss
Value at the  beginning  of each  Renewal Term shall be equal to the Fair Market
Sales  Value of the  Undivided  Interest in the  Facility as of such date.  Such
Stipulated  Loss Values shall be reduced  monthly on a straight  line basis from
the Stipulated  Loss Value as of the beginning of each Renewal Term to an amount
equal to zero at the end of such  Renewal  Term.  Fair  Market  Sales  Value and
Stipulated Loss Value shall be determined by the Appraisal Procedure.

                  Section  21.  Lessee's   Options  to  Purchase  the  Undivided
Interest in the  Facility.  If no Event of Default  shall have  occurred  and be
continuing that could  reasonably be expected to have a material  adverse effect
on the Lessor  following the purchase of the Undivided  Interest in the Facility
by the Lessee,  in addition to the renewal  rights  provided  for in Section 20,
Lessee shall have the option to purchase the Undivided  Interest in the Facility
(i) on the second  anniversary of the  commencement  of the  Fixed-Rate  Renewal
Term,  if any,  at a purchase  price  equal to the lesser of (A) the Fair Market
Sales Value of the  Facility on the date of  purchase,  determined  no more than
twelve (12) months before such date by the Appraisal Procedure and (B) an amount
equal to  $____________;  and (ii) at the end of any Renewal Term, at a purchase
price equal to the Fair Market Sales Value of the Facility,  determined not more
than twelve (12) months  before the purchase  date by the  Appraisal  Procedure;
provided,  however,  that Lessee shall only be entitled to exercise its purchase
options  under this  Section 21 to the extent  that it is  exercising  a similar
purchase  option under the Other Lease.  To exercise any such option to purchase
the Undivided Interest in the Facility from Lessor under this Section 21, Lessee
shall give Lessor  notice of its election to exercise  such right in  compliance
with Section 22, and, upon such purchase date Lessee shall purchase from Lessor,
and shall pay to Lessor in  immediately  available  funds the purchase price for
the  Undivided  Interest  in the  Facility  at the  address  and to the  account
provided  for payment in Section 4;  provided,  at Lessor's  election,  Lessee's
right to purchase the Undivided  Interest in the Facility shall be  extinguished
if an Event of Default  that could  reasonably  be  expected  to have a material
adverse  effect on the Lessor shall have  occurred and be continuing on the date
the  notice  referred  to in  Section  22 is  given  or  thereafter,  or  Lessor
terminates  the Lease based on the existence of an Event of Default  pursuant to
Section 18. Upon receipt of the purchase price (a) the Lessor shall transfer all
of its  right,  title  and  interest  in and to the  Undivided  Interest  in the
Facility and the Leasehold Estate to the Lessee


                                       34

<PAGE>



or to such other  Person as the Lessee may direct on an "as is, where is" basis,
free and clear of Lessor Liens,  and the Lessor shall execute and deliver one or
more bills of sale,  together  with such other  documents  as may be  reasonably
requested by Lessee in order to effect such transfer and  assignment and (b) (i)
the Lease Term and, except as expressly otherwise  provided,  the obligations of
the  Lessee  and  HCNA to  Lessor  under  this  Lease  and the  other  Operative
Documents,  including  the  obligations  of the Lessee to pay Basic Rent on each
Basic Rent Payment Date on or after the date of payment of purchase price, shall
terminate and (ii) the Owner Participant shall promptly surrender any Letters of
Credit to the issuer thereof for cancellation.

                  Section 22. End of Lease Term Notices;  Procedures for Renewal
or Purchase.  (a) Notices at End of Basic Term. Not less than twelve (12) months
or more than twenty-four (24) months prior to the end of the Basic Term,  Lessee
shall give Lessor written notice  electing to (i) return the Undivided  Interest
in the Facility in accordance with the provisions of Section 10(a) at the end of
the Basic Term or (ii)  exercise a renewal  option with respect to the Undivided
Interest  in the  Facility  pursuant  to  Section  20. If Lessor  shall not have
received  an  election  notice on or before the date that is twelve  (12) months
prior to the expiration  date of the Basic Term,  Lessee shall be deemed to have
made the election  specified in Section  22(a)(ii) for the minimum length of the
Fixed Rate Renewal Term permitted by Section 20. Lessee may withdraw such notice
at any time up to twelve (12) months prior to the  expiration  date of the Basic
Term.

                  (b) Notices at End of Renewal Term.  Subject to the provisions
of  subsection  (c)  below,  not less  than  twelve  (12)  months  or more  than
twenty-four (24) months prior to the end of any Renewal Term,  Lessee shall give
Lessor  written  notice  electing  to (i) return the  Undivided  Interest in the
Facility in  accordance  with the  provisions of Section 10(a) at the end of the
Renewal  Term,  or (ii) at the end of such Renewal  Term, so long as no Event of
Default has occurred and is continuing that could reasonably be expected to have
a material  adverse effect on the Lessor following the purchase of the Undivided
Interest in the Facility by the Lessee,  purchase the Undivided  Interest in the
Facility  for the Fair  Market  Sales  Value of the  Undivided  Interest  in the
Facility pursuant to Section 21 or (iii) so long as no Material Event of Default
has  occurred and is  continuing,  exercise a renewal  option for the  Undivided
Interest in the Facility for a Fair Market  Renewal Term pursuant to Section 20.
Lessee may withdraw  such notice at any time up to twelve (12) months  before it
would otherwise purchase the Facility pursuant to a purchase option or renew the
Lease  pursuant  to the  renewal  option.  The Lessee may  specify  that it will
exercise either a purchase or renewal  option,  in which case, not less than six
(6) months prior to the end of the Renewal  Term,  Lessee shall deliver a second
written notice (the "Second  Notice") to Lessor  electing to (i) renew the Lease
or (ii) purchase the Undivided Interest in the Facility; provided, however, that
if Lessee  fails to give the Second  Notice,  it shall be deemed to have renewed
the Lease for the minimum Fair Market  Renewal Term.  Any notice in which Lessee
elects to renew  the Lease  shall  also set forth the  length of the  applicable
Renewal Term, subject to the provisions of Section 20(a).



                                       35

<PAGE>



                  (c)  Notices  on the  Second  Anniversary  of the  Fixed  Rate
Renewal Term. So long as no Event of Default has occurred and is continuing that
could  reasonably  be expected to have a material  adverse  effect on the Lessor
following the purchase of the Undivided  Interest in the Facility by the Lessee,
not less than twelve (12) months or more than  twenty-four  (24) months prior to
the second  anniversary  of the  commencement  of the Fixed Rate  Renewal  Term,
Lessee may give Lessor  written  notice  specifying  that it will  purchase  the
Undivided  Interest in the Facility pursuant to clause (i) of Section 21 for the
lesser  of  its  Fair  Market  Sales  Value  or  $____________.  If  the  second
anniversary  of the Fixed  Rate  Renewal  Term is also the end of the Fixed Rate
Renewal Term, the Lessee may also give the notice provided for in subsection (b)
above.

                  Section  23.  Further  Assurances.   Lessee  shall  cause  the
Operative  Documents and any amendments and supplements to any of them (together
with any  other  instruments,  financing  statements,  continuation  statements,
records or papers necessary in connection therewith) to be recorded and/or filed
and rerecorded and/or refiled in each jurisdiction as and to the extent required
by law in order to, and shall take such other actions as Lessor may from time to
time reasonably request to establish and maintain Lessor's title to and interest
in the  Undivided  Interest  in the  Facility,  subject  to no Liens  other than
Permitted  Liens and each of the  other  rights  and  interests  created  by the
Operative Documents in Lessor. Lessee will promptly and duly execute and deliver
to Lessor such  documents and  assurances and take such further action as Lessor
may from time to time reasonably  request in order to carry out more effectively
the intent and purpose of this Lease and to establish and protect the rights and
remedies created or intended to be created in favor of Lessor,  to establish and
perfect and maintain Lessor's right,  title and interest in and to the Undivided
Interest in the Facility, including, without limitation, if requested by Lessor,
at the expense of Lessee, the recording or filing of counterparts or appropriate
memoranda  hereof,  or of such  financing  statements  or other  documents  with
respect hereto as Lessor may from time to time  reasonably  request,  and Lessor
agrees  promptly  to  execute  and  deliver  such  of  the  foregoing  financing
statements or other documents as may require execution by Lessor.

                  Section 24. Counterparts;  Uniform Commercial Code. This Lease
may be executed by the parties  hereto in separate  counterparts,  each of which
when so executed and delivered shall be an original,  but all such  counterparts
shall together  constitute but one and the same instrument.  Each counterpart of
this Lease which has been  executed by the parties  hereto shall be  prominently
marked to identify the party to whom  originally  delivered.  To the extent,  if
any, that this Lease  constitutes  chattel paper (as such term is defined in the
Uniform Commercial Code as in effect in any applicable  jurisdiction),  only the
counterpart of this Lease and each Lease  Supplement  marked "Lessor's Copy" and
containing the receipt therefor executed by Lessor on the signature page thereof
shall evidence the monetary  obligations of Lessee hereunder and thereunder.  To
the extent, if any, that this Lease  constitutes  chattel paper (as such term is
defined  in  the  Uniform  Commercial  Code  as  in  effect  in  any  applicable
jurisdiction), no security interest in this Lease may be created by the transfer
or  possession  of any  counterpart  hereof  other than the  counterpart  marked
"Lessor's  Copy" and  containing the receipt  therefor  executed by Lessor on or
immediately following the signature page thereof.


                                       36

<PAGE>




                  Section   25.   Notices.   Any   notice,   request   or  other
communication  hereunder  shall be made in  accordance  with  Section 9.1 of the
Participation Agreement.

                  Section 26.  Investment  of Funds.  Any monies  required to be
paid to or  retained  by  Lessor  that  are not  required  to be paid to  Lessee
pursuant to this Lease or any other Operative  Document solely because a Default
or Event of Default shall have occurred and be continuing,  shall, until paid to
Lessee or  otherwise  applied as provided in this Lease or such other  Operative
Document,  be invested by Lessor as security for the  obligations  of Lessee and
not as part of the Trust Estate from time to time at the written  direction  and
expense  of Lessee in (a)  obligations  of, or  guaranteed  as to  interest  and
principal  by, the United  States  maturing  within  thirty (30) days after such
investment,  (b) open market  commercial  paper maturing within thirty (30) days
after such investment of any  corporation  (other than Lessee or its Affiliates)
incorporated under the laws of the United States of America or any State thereof
rated  "Prime-l"  or its  equivalent  by Moody's or "A-1" or its  equivalent  by
Standard  & Poor's or (c)  certificates  of  deposit  maturing  on or before the
thirtieth (30th) day after such investment  issued by commercial banks organized
under the laws of the United States of America or any  governmental  subdivision
thereof having  combined  capital and surplus in excess of  $1,000,000,000  and,
with  respect to any such  commercial  bank,  rated "A+" or better by Standard &
Poor's  Ratings  Group (or any  successor)  to the extent such  ratings are then
published.  Any gain (including  interest  received) realized as a result of any
such  investment  (net of any  fees,  commissions  or  other  expenses,  if any,
incurred  in  connection  with such  investment  for which  Lessor  has not been
reimbursed)  shall be available  for  application  pursuant to this Lease or the
other  Operative  Documents to the same extent as any monies  invested by Lessor
pursuant  to this  Section  26,  with any  portion  of such  gain that is not so
applied  being  paid to Lessee at the time any  unapplied  portion of the monies
invested pursuant to this Section 26 would be payable to Lessee.

                  Section 27. Miscellaneous.  (a) Severability. Any provision of
this Lease that is prohibited or unenforceable in any jurisdiction  shall, as to
such  jurisdiction  only, be  ineffective  to the extent of such  prohibition or
unenforceability  without  invalidating the remaining provisions hereof, and any
such prohibition or unenforceability in any jurisdiction shall not invalidate or
render  unenforceable  such provision in any other  jurisdiction.  To the extent
permitted by Applicable  Law, the parties hereto waive any provision of law that
renders any provision hereof prohibited or unenforceable in any respect.

                  (b) Survival. The representations,  warranties and indemnities
of Lessee under this Lease shall survive the  expiration or earlier  termination
of this Lease,  but all other provisions of this Lease shall terminate upon such
termination or expiration.

                  (c) Amendment.  Neither this Lease nor any of the terms hereof
may be terminated, amended, supplemented, waived or modified orally, but only by
an instrument in writing  signed by the party against which the  enforcement  of
the termination, amendment, supplement, waiver or modification is sought.



                                       37

<PAGE>



                  (d)  Headings,  etc. The Table of Contents and headings of the
various  Sections of this Lease are for  convenience of reference only and shall
not modify, define or limit any of the terms or provisions hereof.

                  (e)  Successors  and Assigns;  Third Party  Beneficiary.  This
Lease  shall be binding  upon and inure to the  benefit of Lessor and Lessee and
their  respective  successors and permitted  assigns.  The Lessor and the Lessee
agree  that the Owner  Participant  shall be a third  party  beneficiary  of the
representations,  warranties and covenants contained in this Lease which purport
to run to the benefit of the Owner Participant.

                  (f)  Non-Merger  of  Interests.  It is  the  intention  of the
parties hereto that, unless Lessor shall expressly provide to the contrary,  any
right, title or interest of Lessor in and to the Operative Documents or any part
thereof (including,  without limitation, under or pursuant to this Lease) now or
hereafter  acquired shall remain existing  separate and distinct from, and shall
not merge with,  any right,  title or interest of Lessee (or its  successors  or
assigns)  in,  under or pursuant to this Lease which Lessor may now or hereafter
acquire  pursuant to this Lease or  otherwise,  notwithstanding  any  coincident
ownership by Lessor in one or more of such rights, titles or interests.

                  (g) Lease Subject to Applicable  Law. All of the provisions of
this Lease are intended to be subject to all  provisions of applicable  law that
may be controlling  and to be limited to the extent  necessary so that they will
not render  this Lease  invalid or  unenforceable  under the  provisions  of any
Applicable Law.

                  (h)  Governing  Law;  Consent  to  Jurisdiction;   Service  of
Process;  Waiver of  Immunities.  This Lease has been delivered in, and shall in
all respects be governed by and  construed in accordance  with,  the laws of the
State of New York  applicable  to agreements  made and to be performed  entirely
within such state  (regardless  of the laws that might  otherwise  govern  under
applicable   principles   of  conflict  of  laws),   including  all  matters  of
construction,  validity and performance;  provided, that matters relating to the
creation  of the  leasehold  estate  hereunder  and the  exercise  of rights and
remedies  with  respect to such estate  shall be governed  by and  construed  in
accordance with the laws of the State of California.

                         (i) Each of the parties hereto hereby  irrevocably  and
         unconditionally  submits to the  non-exclusive  jurisdiction of any New
         York State or United States Federal court sitting in New York City and,
         in the event it is a defendant, of any court of its corporate domicile,
         over any suit, action or proceeding  arising out of or relating to this
         Lease, and the appellate courts of any such  jurisdiction.  Each of the
         parties hereto irrevocably and  unconditionally  waives, to the fullest
         extent  permitted by law, any  objection  which it may now or hereafter
         have to the laying of the venue of any such suit,  action or proceeding
         brought  in such a court and any claim  that any such  suit,  action or
         proceeding  brought in such a court has been brought in an inconvenient
         forum.  To the extent  that  Lessee has or  hereafter  may  acquire any
         immunity from  jurisdiction of any court or from any legal process with
         respect to itself or its property, Lessee irrevocably


                                       38

<PAGE>



         waives such immunity in respect of its obligations  hereunder.  Each of
         the parties hereto agrees that final judgment in any such suit,  action
         or proceeding  brought in such a court shall be conclusive  and binding
         upon such party and may be  enforced  in any court to  jurisdiction  of
         which  such party is  subject  by a suit upon such  judgment  or in any
         manner provided by law;  provided,  that service of process is effected
         as  permitted  by law,  or in the case of  Lessee,  upon  Lessee in the
         manner specified in the following  subsection or as otherwise permitted
         by law.

                        (ii)  As  long  as  any  obligations   exist  under  the
         Operative Documents,  Lessee will at all times have an authorized agent
         in New York City,  upon whom  process may be served in any legal action
         or  proceeding  arising out of or  relating  to this Lease.  Service of
         process upon such agent and written  notice of such  service  mailed or
         delivered to Lessee  shall to the extent  permitted by law be deemed in
         every  respect  effective  service of process  upon  Lessee in any such
         legal  action or  proceeding.  Lessee  hereby  irrevocably  appoints CT
         Corporation  System,  as its agent for such purpose,  and covenants and
         agrees that service of process in any suit, action or proceeding may be
         made upon such party at the office of such agent at 1633 Broadway,  New
         York, New York 10019, U.S.A. Notwithstanding the foregoing, Lessee may,
         with prior written  notice to Lessor,  terminate the  appointment of CT
         Corporation  System and appoint another agent for the above purposes so
         that Lessee shall at all times have an agent for the above  purposes in
         New York City.

                        (iii) Lessee hereby  irrevocably  waives, to the fullest
         extent  permitted by law, any  requirement  or other  provision of law,
         rule, regulation or practice which requires or otherwise establishes as
         a condition to the institution,  prosecution or completion of any suit,
         action or proceeding  (including appeals) arising out of or relating to
         this  Lease,  the  posting of any bond or the  furnishing,  directly or
         indirectly, of any other security.

                  Section 28.  Limitations on Lessor Liability.  It is expressly
understood and agreed by the parties hereto that,  except as otherwise  provided
herein or in the other  Operative  Documents,  (a) this Lease is executed by the
Trust Company, not in its individual capacity, but solely as Owner Trustee under
the Trust  Agreement in the exercise of the power and  authority  conferred  and
vested  in  it as  Owner  Trustee,  (b)  each  and  every  agreement,  covenant,
representation,  and  warranty  herein  made on the part of  Lessor  is made and
intended not as a personal agreement, covenant,  representation, and warranty by
Trust Company, or for the purpose or with the intention of binding Trust Company
personally,  but are made and intended for the purpose of binding only the Trust
Estate, (c) actions to be taken by Lessor pursuant to its obligations under this
Lease  may,  in certain  circumstances,  be taken by Lessor  only upon  specific
authority of Owner Participant, (d) nothing contained in the this Lease shall be
construed  as  creating  any  liability  on  Trust  Company,   individually   or
personally, or any incorporator or any past, present or future subscriber to the
capital  stock of, or  stockholder,  officer or director  of,  Trust  Company to
perform any covenants, warranties, representations, duties or obligations either
expressly or impliedly  contained  herein,  all such  liability,  if any,  being
expressly waived


                                       39

<PAGE>



by the other party hereto and by any Person  claiming  by,  through or under it,
and (e) so far as Trust Company,  individually or personally,  is concerned, the
other party hereto and any Person  claiming  by,  through or under it shall look
solely to the Trust Estate for the  performance of any  obligation  hereunder or
under any of the instruments referred to herein; provided, however, that nothing
in this Section 28 shall be construed to limit in scope or substance the general
corporate  liability of Trust Company in respect of (i) its gross  negligence or
willful   misconduct   or  its   negligent   handling  of  monies,   (ii)  those
representations,  warranties  and covenants of Trust  Company in its  individual
capacity set forth herein,  (iii) the  consequences of its own acts or omissions
in breach of the Trust Agreement  resulting from its gross  negligence,  willful
misconduct  or bad  faith,  (iv)  any Tax  based  on or  measured  by any  fees,
commission  or  compensation  received by it for acting as trustee in connection
with any of the  transactions  contemplated  herein.  Nothing in this Section 28
shall be deemed to prevent any party hereto from having  recourse to and seeking
enforcement against the Trust Estate of any covenants, agreements and conditions
required to be  performed  or observed by the Owner  Trustee (in its  individual
capacity and as Owner Trustee) in this Lease.


                                       40

<PAGE>



                  IN WITNESS  WHEREOF,  Lessor and Lessee  have each caused this
Lease Agreement to be duly executed and delivered by their  respective  officers
thereunto duly authorized as of the day and year first above written.

                                       U.S. TRUST COMPANY OF CALIFORNIA,
                                       N.A., not in its individual capacity, but
                                       solely as owner  trustee  under the Trust
                                       Agreement    that   creates   the   trust
                                       identified  under  the title  hereof,  as
                                       Lessor


                                       By:  ____________________________________
                                       Name:
                                       Title:


                                       NORTH AMERICAN CHEMICAL COMPANY,
                                       as Lessee


                                       By:  ____________________________________
                                       Name:
                                       Title:



                                       41

<PAGE>



                                   SCHEDULE I


                             Description of Facility































                                 Schedule I - 1

<PAGE>



                                   SCHEDULE II


                               Description of Site






























                                 Schedule II - 1

<PAGE>



                                  SCHEDULE III


                           Interim Rent and Basic Rent






























                                Schedule III - 1

<PAGE>


                                   SCHEDULE IV


                             Stipulated Loss Values






























                                 Schedule IV - 1

<PAGE>




                               GUARANTY AGREEMENT
                           (Searles Valley Trust 1996)


                  GUARANTY  dated as of July 15, 1996, by HARRIS  CHEMICAL NORTH
AMERICA,  INC., a Delaware corporation,  for the benefit of [Owner Participant],
[OP Guarantor] and U.A. Trust Company of California, N.A., not in its individual
capacity, but solely as owner trustee under the Trust Agreement that creates the
trust identified under the title hereof (each  individually a "Guaranteed Party"
and collectively, the "Guaranteed Parties").

                  WHEREAS HCNA is the owner of all of the issued and outstanding
capital stock of NACC;

                  WHEREAS (i) the Owner Trustee proposes, among other things, to
purchase the Undivided  Interest in the Facility in an aggregate amount equal to
the Facility  Cost,  (ii) Owner  Participant  proposes,  among other things,  to
provide to Owner Trustee funds for such purchase,  and (iii) upon purchasing the
Undivided  Interest in Facility,  Owner  Trustee  intends to lease the Undivided
Interest  in the  Facility  to  NACC,  all  as  described  in the  Participation
Agreement; and

                  WHEREAS  it  is  a  condition  of  the  willingness  of  Owner
Participant to enter into the  transactions  contemplated  by the  Participation
Agreement that HCNA execute and deliver this HCNA Guaranty;

                  NOW, THEREFORE,  in consideration of the foregoing,  and other
good and valuable  consideration,  the receipt of which is hereby  acknowledged,
HCNA  hereby  agrees  with and for the  benefit  of the  Guaranteed  Parties  as
follows:

                  Section 1.  Guaranty of  Guaranteed  Obligations.  HCNA hereby
irrevocably and  unconditionally  guarantees to each Guaranteed  Party (a) until
final and  indefeasible  payment  thereof  has been made,  the due and  punctual
payment to the Person  entitled to receive such payment from NACC, of all of the
Guaranteed Obligations in accordance with their respective terms and when and as
due (whether at maturity,  by reason of  acceleration  or otherwise) and (b) the
full and prompt  performance  by NACC of all of the Guaranteed  Obligations.  In
case NACC shall fail to pay or  perform  duly,  completely  and  punctually  any
Guaranteed Obligation when and as the same shall be due (whether at maturity, by
reason of acceleration  or otherwise) and payable,  or required to be performed,
as the  case  may be,  in  accordance  with the  terms  of the  Lease  Financing
Documents, HCNA will immediately pay or perform, as the case may be, the same to
or for the benefit of each  Guaranteed  Party  pursuant  to the Lease  Financing
Documents.



<PAGE>



                  Section 2.  Recovered  Payments.  The  Guaranteed  Obligations
shall be deemed  not to have been paid and  HCNA's  obligations  under this HCNA
Guaranty in respect thereof shall continue and not be discharged,  to the extent
that any payment thereof by NACC or any other guarantor,  or out of the proceeds
of any  collateral,  is  recovered  from or paid over by or for the account of a
Guaranteed  Party  for any  reason,  including  as a  preference  or  fraudulent
transfer  or by  virtue  of any  subordination  (whether  present  or  future or
contractual or otherwise) of the Guaranteed  Obligations,  whether such recovery
or payment  over is  effected by any  judgment,  decree or order of any court or
governmental  agency,  by  any  plan  of  reorganization  or  by  settlement  or
compromise by the Guaranteed Party (whether or not consented to by NACC, HCNA or
any other guarantor) of any claim for any such recovery or payment over.

                  Section 3. Nature of HCNA's  Obligations.  HCNA's  obligations
under this HCNA Guaranty (a) are absolute and  unconditional,  (b) are unlimited
in amount,  (c)  constitute  a guaranty  of payment  and  performance  and not a
guaranty of collection, (d) are as primary obligor and not as a surety only, (e)
shall be a continuing guaranty of all present and future Guaranteed  Obligations
and all amendments, modifications, supplements, renewals of or extensions to the
Guaranteed  Obligations,  whether such amendments,  modifications,  supplements,
renewals or extensions are evidenced by new or additional instruments, documents
or agreements, and (f) shall be irrevocable. The obligations of HCNA to make any
payment or to perform and  discharge any other  duties,  agreements,  covenants,
undertakings  or  obligations   hereunder  shall  to  the  extent  permitted  by
Applicable Law, constitute separate and independent obligations of HCNA from its
other  obligations  under  this HCNA  Guaranty,  and give rise to  separate  and
independent  causes of action against HCNA.  HCNA agrees that this HCNA Guaranty
shall be  automatically  reinstated if and to the extent that for any reason any
payment by or on behalf of NACC is rescinded  or must be  otherwise  restored by
any of the Guaranteed Parties, their successors and assigns, whether as a result
of  any  proceedings  in  bankruptcy  or  reorganization   or  otherwise.   HCNA
specifically  agrees that it shall not be necessary,  and that HCNA shall not be
entitled to require, before or as a condition of enforcing the liability of HCNA
under this HCNA Guaranty or requiring  payment or  performance of the Guaranteed
Obligations by HCNA hereunder,  or at anytime  thereafter,  that any Person: (i)
file suit or proceed to obtain or assert a claim for personal  judgment  against
NACC or any other Person that may be liable for any Guaranteed Obligation,  (ii)
make any  other  effort to  obtain  payment  or  performance  of any  Guaranteed
Obligation  from NACC or any other Person that may be liable for such Guaranteed
Obligation,  (iii) foreclose against or seek to realize upon any security now or
hereafter existing for such Guaranteed  Obligation,  (iv) exercise or assert any
other right or remedy to which such  Person is or may be entitled in  connection
with any Guaranteed  Obligation or any security or other guaranty  therefor,  or
(v) assert or file any claim against the assets of NACC or any other


                                       -2-

<PAGE>



Person liable for any Guaranteed Obligation.  Notwithstanding the foregoing, the
provisions  of this  Section 3 shall not be  construed  to avoid any  notices of
demands  or the  lapse of any time  periods  available  to NACC  under the Lease
Financing Documents.

                  Section 4. No Release of HCNA.  THE  OBLIGATIONS OF HCNA UNDER
THIS HCNA GUARANTY SHALL NOT BE REDUCED,  LIMITED OR TERMINATED,  NOR SHALL HCNA
BE DISCHARGED FROM ANY THEREOF,  FOR ANY REASON WHATSOEVER (other than,  subject
to  Section  6,  the  payment  of the  Guaranteed  Obligations  or as  otherwise
expressly contemplated in the Lease Financing Documents), including (and whether
or not the same  shall have  occurred  or failed to occur once or more than once
and whether or not HCNA shall have received notice thereof):

                  (a) (i) any  increase  of, (ii) any  extension  of the time of
payment or performance  of, (iii) any other  amendment or modification of any of
the other terms and provisions  of, (iv) any release,  composition or settlement
(whether by way of acceptance of a plan of  reorganization or otherwise) of, (v)
any subordination (whether present or future or contractual or otherwise) of, or
(vi) any  discharge,  disallowance,  invalidity,  illegality,  voidness or other
unenforceability of, the Guaranteed Obligations;

                  (b) (i) any failure to obtain,  (ii) any release,  composition
or settlement  of, (iii) any amendment or  modification  of any of the terms and
provisions of, (iv) any  subordination  of, or (v) any discharge,  disallowance,
invalidity,  illegality,  voidness  or  other  unenforceability  of,  any  other
guaranties of the Guaranteed Obligations;

                  (c) (i) any  failure  to obtain or any  release  of,  (ii) any
failure to protect or preserve,  (iii) any release,  compromise,  settlement  or
extension  of the time of  payment  of any  obligations  constituting,  (iv) any
failure to perfect or maintain the  perfection or priority of any Lien upon, (v)
any  subordination  of any  Lien  upon,  or (vi)  any  discharge,  disallowance,
invalidity,  illegality,  voidness  or  other  unenforceability  of any  Lien or
intended Lien upon,  any  collateral  now or hereafter  securing the  Guaranteed
Obligations or any other guaranties thereof;

                  (d) any termination of or change in any  relationship  between
HCNA and NACC,  including any such termination or change resulting from a change
in the  ownership  of  HCNA or NACC or  from  the  cessation  of any  commercial
relationship  between HCNA and NACC, other than pursuant to Section 13 or to the
extent expressly otherwise contemplated in the Lease Financing Documents;

                  (e)  any  exercise  of,  or any  election  not or  failure  to
exercise,  delay  in the  exercise  of,  waiver  of,  or  forbearance  or  other
indulgence with respect to, any right, remedy or power available to a Guaranteed
Party,  including  (i) any  election  not or  failure to  exercise  any right of
setoff,  recoupment or counterclaim,  (ii) any acceptance of partial payments on
the Guaranteed Obligations; (iii) any election of remedies effected by


                                       -3-

<PAGE>



a Guaranteed Party,  including the foreclosure upon any real estate constituting
collateral,  whether  or not  such  election  affects  the  right  to  obtain  a
deficiency  judgment,  and  (iv) any  election  by the  Guaranteed  Party in any
proceeding under the Bankruptcy Code of the application of Section 1111(b)(2) of
such Code;

                  (f)  receipt by the Guaranteed  Parties (and holding  thereby)
of additional security of guaranties for the Guaranteed  Obligations or any part
thereof;

                  (g)  any bankruptcy, insolvency, reorganization,  arrangement,
adjustment, composition, dissolution, liquidation, or the like, of NACC, HCNA or
any other Person;

                  (h) any limitation of the remedies of the  Guaranteed  Parties
under the Lease Financing Documents,  or any limitation of the liability of NACC
under the Lease  Financing  Documents,  which may now or hereafter be imposed by
any Applicable Law;

                  (i) any merger or  consolidation  of NACC or HCNA into or with
any other Person, or any transfer,  conveyance, sale, lease or other disposition
of any or all of the assets of NACC or HCNA to any other Person,  or any consent
by the Guaranteed Parties to any such merger, consolidation,  transfer of assets
or any other  restructuring  or termination of the corporate  existence of NACC,
HCNA or any other Person;

                  (j)  any Debt of NACC to any Person, including HCNA;

                  (k)  any claim,  set-off,  deduction  or defense HCNA may have
against any of the  Guaranteed  Parties,  whether  hereunder  or under the Lease
Financing   Documents  or  independent  of  or  unrelated  to  the  transactions
contemplated by the Lease Financing Documents (without prejudice to HCNA's right
to assert  such  claim,  set-off,  deduction  or defense  in a  separate  action
unrelated to any action for  enforcement of this HCNA Guaranty or the Guaranteed
Obligations, so long as HCNA does not set-off the amount of such claim, set-off,
deduction or defense  against its obligation to pay the  Guaranteed  Obligations
hereunder); and

                  (l)  ANY OTHER  ACT OR  FAILURE  TO ACT OR ANY OTHER  EVENT OR
CIRCUMSTANCE  THAT (i) VARIES THE RISK OF HCNA UNDER THIS HCNA  GUARANTY OR (ii)
BUT FOR THE PROVISIONS  HEREOF,  WOULD, AS A MATTER OF STATUTE OR RULE OF LAW OR
EQUITY, OPERATE TO REDUCE, LIMIT OR TERMINATE THE OBLIGATIONS OF HCNA THEREUNDER
OR DISCHARGE HCNA FROM ANY THEREOF.

                  Should any money due or owing under this HCNA  Guaranty not be
recoverable  from HCNA due to any of the matters  specified in this Section 4(a)
through  (l)  above,  then,  in any  case,  such  money  shall  nevertheless  be
recoverable  from HCNA as though HCNA were principal  obligor in respect thereof
and not merely a guarantor and shall be paid by HCNA forthwith.



                                       -4-

<PAGE>



                  Section 5.  Waivers.

                  (a) HCNA waives the  benefits  of any  statute of  limitations
affecting its liability under this HCNA Guaranty or the  enforcement  thereof to
the fullest extent permitted by Applicable Law.

                  (b) HCNA waives any  defense to, and any setoff,  counterclaim
and claim of recoupment against, the Guaranteed Obligations that may at any time
be available to NACC or any other guarantor  (without  prejudice to HCNA's right
to assert such  defense,  set-off,  counterclaim  or claim in a separate  action
unrelated to any action for  enforcement of this HCNA Guaranty or the Guaranteed
Obligations,  so long as HCNA  does not  set-off  the  amount  of such  defense,
set-off,  counterclaim  or  claim  against  its  obligation  to  pay  Guaranteed
Obligations hereunder).  Until the Termination Date, HCNA shall have no right of
subrogation, and HCNA waives, to the fullest extent permitted by Applicable Law:
(i) any  right to  enforce  any  remedy  which  Guaranteed  Party now has or may
hereafter have against NACC in respect of any of the Guaranteed Obligations, and
(ii) any benefit of, and any right to participate  in, any  collateral,  whether
real or personal  property,  now or hereafter  held by Guaranteed  Party for the
Guaranteed Obligations.

                  (c) HCNA waives:  (i) notice of acceptance of and intention to
rely on this HCNA  Guaranty,  (ii)  notice of the  incurrence  or renewal of any
other Guaranteed Obligations,  (iii) notice of any of the matters referred to in
Section 4, and (iv) all other notices that may be required by Applicable  Law or
otherwise  to  preserve  any  rights  against  HCNA  under  this HCNA  Guaranty,
including any notice of default, demand, dishonor, presentment and protest. HCNA
assumes  the  responsibility  for being and keeping  informed  of the  financial
condition  of NACC  and of all  other  circumstances  bearing  upon  the risk of
nonpayment of the Guaranteed  Obligations  which diligent  inquiry would reveal,
and  agrees  that  Guaranteed  Party  shall  have  no  duty  to  advise  HCNA of
information known to it regarding such condition or any such  circumstances.  It
is not and shall not be  necessary  for  Guaranteed  Party to  inquire  into the
powers  of NACC or any of its  agents  acting  or  purporting  to act on  behalf
thereof,  and any  Guaranteed  Obligations  made or created in reliance upon the
professed  exercise of such powers shall be  guaranteed  hereunder.  HCNA agrees
that Guaranteed Party's books and records showing the account between Guaranteed
Party and NACC shall be admissible in any proceeding or action.

                  (d) HCNA  waives any  requirement,  and any right to  require,
that any right or power be exercised or any action be taken  against  NACC,  any
other guarantor or any collateral for the Guaranteed Obligations and HCNA waives
the right to have the  property of NACC first  applied to the  discharge  of the
Guaranteed Obligations.  Guaranteed Party may at its election exercise any right
or remedy it may have against NACC or any  collateral  now or hereafter  held by
Guaranteed Party, including, without limitation, the right to foreclose upon any
such collateral by judicial or


                                       -5-

<PAGE>



nonjudicial  sale,  without  affecting or impairing in any way the  liability of
HCNA  hereunder.  HCNA  understands  that the  exercise by  Guaranteed  Party of
certain  rights and  remedies  contained  in the Lease  Financing  Documents  or
otherwise arising under Applicable Law could affect or eliminate HCNA's right of
subrogation,  contribution  or  indemnification  against  NACC and that HCNA may
therefore succeed to a partially or totally nonreimbursable liability hereunder.
Nevertheless,  HCNA hereby authorizes and empowers Guaranteed Party to exercise,
in its sole  discretion any rights and remedies or any combination of rights and
remedies that may then be available,  since it is the intent and purpose of HCNA
that the Guaranteed  Obligations  hereunder  shall be absolute,  independent and
unconditional  under any and all  circumstances.  HCNA  waives:  (i) any defense
arising by reason of any disability or other defense of NACC or by reason of the
cessation  from any cause  whatsoever  of the  liability,  either in whole or in
part,  of NACC to  Guaranteed  Party  for the  Guaranteed  Obligations  (without
prejudice to HCNA's right to assert such defense, in a separate action unrelated
to  any  action  for  enforcement  of  this  HCNA  Guaranty  or  the  Guaranteed
Obligations, so long as HCNA does not set-off the amount of such defense against
its obligation to pay Guaranteed Obligations hereunder),  (ii) any defense based
on the discharge of NACC by operation of law,  notwithstanding  any intervention
or omission by Guaranteed  Party,  and (iii) any defense based on or arising out
of the absence,  impairment or loss of any right of reimbursement,  contribution
or  subrogation  or any other right or remedy of HCNA  against  NACC or any such
collateral,  whether  resulting  from  such  election  by  Guaranteed  Party  or
otherwise.

                  (e) HCNA  waives all rights,  benefits  or defenses  under any
Applicable Laws which: (i) reduce the obligation of a surety upon the acceptance
by a  creditor  of  anything  in partial  satisfaction  of an  obligation,  (ii)
exonerate the surety if by any act of the  creditor,  without the consent of the
surety, the original  obligation of the principal is altered in any respect,  or
the  remedies  or rights of the  creditor  against  the  principal,  in  respect
thereto, are in any way suspended or impaired, (iii) exonerate the surety to the
extent that the creditor does not proceed  against the principal,  or pursue any
other remedy in the creditor's  power which the surety cannot pursue,  and which
would  lighten the surety's  burden,  (iv) reduce the  guaranteed  obligation in
proportion  to the  principal  obligation,  (v)  prohibit  the  recovery  of any
deficiency on a real property purchase money  obligation,  and (vi) prohibit the
recovery of any deficiency on a note secured by a deed of trust on real property
in case such real  property  is sold under the power of sale  contained  in such
deed of trust. Without limiting the generality of the foregoing, HCNA waives all
rights, benefits and defenses arising under (a) Sections 2809, 2810, 2819, 2822,
2825, 2845, 2899 and 3433 of the California Civil Code, and (b) Sections 580(a),
580(b), 580(d) and 726 of the California Code of Civil Procedure,  to the extent
such sections, or any of them, have any application hereto or any application to
HCNA.



                                       -6-

<PAGE>



                  (f)  Without  limiting  the  application  of any of the  other
waivers contained in this Section 5, HCNA hereby expressly waives all rights and
defenses arising out of an election of remedies by Guaranteed Party, even though
that election of remedies, such as a nonjudicial foreclosure with respect to any
real property  collateral for the Guaranteed  Obligations,  has destroyed HCNA's
rights of subrogation and  reimbursement  against the principal (i.e.,  NACC) by
the  operation  of Section  580d of the  California  Code of Civil  Procedure or
otherwise.  Additionally,  HCNA  understands and agrees that: (i) by waiving the
anti-deficiency  protections and the subrogation rights and defenses referred to
in this Section 5 which protections,  rights and defenses might otherwise afford
HCNA with protection  from a deficiency  judgment  following  foreclosure of any
real property collateral for the Guaranteed Obligations, HCNA can be held liable
for a deficiency judgment following a judicial or non-judicial  foreclosure sale
of  such  real  property  collateral   (including  a  judicial  or  non-judicial
foreclosure sale of a purchase money  obligation) even if the price paid for the
real property  collateral at the non-judicial  foreclosure sale is less than the
fair value of the real  property  collateral,  (ii) HCNA is waiving  its defense
that  the  price  paid  for  the  real  property  collateral  at a  judicial  or
non-judicial  foreclosure  sale  may  not be  equal  to the  fair  value  of the
property,  and (iii) by HCNA waiving its right to a fair value hearing following
the foreclosure sale Guaranteed  Party can seek a deficiency  against HCNA up to
the entire amount of the  indebtedness  secured by the real property  collateral
with  interest  and costs of sale less the amount  paid for the  property at the
judicial or non-judicial foreclosure sale.

                  (g) HCNA WAIVES ALL OTHER RIGHTS,  BENEFITS AND DEFENSES UNDER
APPLICABLE LAW THAT WOULD, BUT FOR THIS  SUBPARAGRAPH  (g), BE AVAILABLE TO HCNA
AS A DEFENSE AGAINST OR A REDUCTION OR LIMITATION OF ITS OBLIGATIONS  UNDER THIS
HCNA GUARANTY (without prejudice to HCNA's right to assert such rights, benefits
or defenses in a separate action unrelated to any action for enforcement of this
HCNA Guaranty or the  Guaranteed  Obligations,  so long as HCNA does not set-off
the amount of such rights,  benefits or defenses  against its  obligation to pay
Guaranteed Obligations hereunder).

                  Section  6.  Payments  by HCNA.  (a)  Place  and  Manner.  All
payments due to the  Guaranteed  Party under this HCNA Guaranty shall be made to
the  Guaranteed  Party at the address and the  account  provided  for payment in
Section 9.1 of the  Participation  Agreement  or to such other Person or at such
other  address as the  Guaranteed  Party may  designate by notice to HCNA.  HCNA
agrees  that it will make all  payments  due  hereunder  by wire  transfer at or
before 1:00 p.m., New York time, in immediately  available funds to the party to
which payment is to be made.

                  (b)  No  Reductions.  All  payments due the  Guaranteed  Party
under  this  HCNA  Guaranty  shall  be made by HCNA  without  any  reduction  or
deduction  whatsoever,  including  any  reduction or deduction  for any set-off,
recoupment or counterclaim (whether, in


                                       -7-

<PAGE>



any case, in respect of an obligation owed by the Guaranteed Party to HCNA, NACC
or any other guarantor and, in the case of a counterclaim,  whether  sounding in
tort,  contract or otherwise),  without prejudice to HCNA's right to assert such
reduction  or  deduction  in a  separate  action  unrelated  to any  action  for
enforcement of this HCNA Guaranty or the Guaranteed Obligations, so long as HCNA
does  not  set-off  the  amount  of such  reduction  or  deduction  against  its
obligation to pay Guaranteed Obligations hereunder.

                  (c)  Extension of Payment  Dates.  Whenever any payment to the
Guaranteed  Party under this HCNA Guaranty would  otherwise be due on a day that
is not a Business Day, such payment shall instead be due on the next  succeeding
Business Day.

                  Section 7. Notices and Deliveries. All notices, communications
and materials to be given or delivered  pursuant to this HCNA Guaranty  shall be
given  or  delivered  in  accordance  with  Section  9.1  of  the  Participation
Agreement.

                  Section 8. Rights Cumulative.  Each of the rights and remedies
of each Guaranteed Party under this HCNA Guaranty shall be in addition to all of
its other rights and  remedies  under  Applicable  Law, and nothing in this HCNA
Guaranty shall be construed as limiting any such rights or remedies.

                  Section 9. Amendments;  Waivers. Any term, covenant, agreement
or condition of this HCNA Guaranty may be amended, and any right under this HCNA
Guaranty may be waived,  if, but only if, such amendment or waiver is in writing
and is signed by each  Guaranteed  Party and,  in the case of an  amendment,  by
HCNA.  No election not to exercise,  failure to exercise or delay in  exercising
any right,  nor any course of dealing or performance,  shall operate as a waiver
of any right of a Guaranteed  Party under this HCNA Guaranty or Applicable  Law,
nor shall any single or partial exercise of any such right preclude any other or
further  exercise  thereof or the  exercise of any other  right of a  Guaranteed
Party under this HCNA Guaranty or Applicable Law.

                  Section 10.  Assignments.  Except  pursuant to Section 6.2(h),
6.3(a)(ii)  or  6.3(b)(ii)  of the  Participation  Agreement  or to  the  extent
otherwise  permitted in the Lease Financing  Documents,  (a) HCNA may not assign
any of its rights or  obligations  under this HCNA  Guaranty  without  the prior
written  consent of each  Guaranteed  Party,  and (b) no  assignment of any such
obligation  shall release HCNA therefrom unless each Guaranteed Party shall have
consented to such release in a writing specifically  referring to the obligation
from which HCNA is to be released.

                  Section 11.  Governing  Law. THIS HCNA GUARANTY AND ANY BREACH
OR  DISPUTE  WITH  RESPECT TO THIS HCNA  GUARANTY  SHALL,  PURSUANT  TO NEW YORK
GENERAL  OBLIGATIONS  LAW  SECTION  5-1401,  BE  GOVERNED  BY AND  CONSTRUED  IN
ACCORDANCE  WITH  THE LAWS OF THE  STATE OF NEW  YORK.  In  connection  with the
foregoing, it is further


                                       -8-

<PAGE>



acknowledged and agreed that it is the specific intent and understanding of HCNA
and the Guaranteed Parties that this HCNA Guaranty be governed by the law of the
State of New York as set forth above under all circumstances and notwithstanding
any  reference  in this HCNA  Guaranty  to the laws of any  other  jurisdiction,
including, without limitation, the laws of the State of California.

                  Section 12. Severability of Provisions.  Any provision of this
HCNA Guaranty that is prohibited or unenforceable in any jurisdiction  shall, as
to such  jurisdiction,  be  ineffective  to the  extent of such  prohibition  or
unenforceability   without  invalidating  the  remaining  provisions  hereof  or
affecting  the  validity  or  enforceability  of  such  provision  in any  other
jurisdiction.  To the extent permitted by Applicable Law, HCNA hereby waives any
provision of  Applicable  Law that renders any  provision of this HCNA  Guaranty
prohibited or unenforceable in any respect.

                  Section 13.  Termination and Release.  The HCNA Guaranty shall
terminate,  and HCNA shall be released from its obligations  hereunder and under
the other Operative Documents, if any,

                  (a)  on the HCNA Guaranty Termination Date; or

                  (b)  if, (i) immediately  after giving effect to a transaction
(A) in which NACC  consolidates  with, merges with or into or is merged into by,
any other Person (other than any Restricted  Subsidiary of HCNA) or, directly or
indirectly,  transfers,  conveys, sells, leases or otherwise disposes of (1) all
or substantially all of its properties and assets as an entirety,  or (2) all or
substantially  all of the  properties and assets that comprise the Complex as an
entirety,  to any other Person (other than any Restricted Subsidiary of HCNA) or
(B) as a result of which NACC is no longer a Restricted Subsidiary of HCNA (NACC
or such  surviving  Person  after  giving  effect to any such  transaction,  the
"Surviving  Lessee") and (ii)  continuously for a period of at least twelve (12)
months immediately  following such transaction,  the outstanding Debt of (A) the
Surviving  Lessee,  or (B) an Affiliate of the Surviving Lessee that has entered
into a guaranty on terms  substantially  equivalent to the HCNA Guaranty in form
reasonably  acceptable to the Owner  Participant,  with an Average Weighted Life
equal to or greater than the Average  Weighted Life of the remaining  Basic Rent
during the Basic Term or the  Renewal  Term,  as  applicable,  shall be rated at
least BBB (or subsequent  equivalent rating) by Standard & Poor's, at least Baa2
(or  subsequent  equivalent  rating)  by  Moody's  or at least 2 (or  subsequent
equivalent rating) by National Association of Insurance Commissioners, or if any
such agency no longer publishes ratings, then the equivalent rating as published
by another Rating Agency.

                  Section 14.  Successors and Assigns.  All of the provisions of
this HCNA Guaranty shall be binding upon HCNA and its


                                       -9-

<PAGE>



successors  and  assigns  and shall inure to the benefit of, and may be enforced
by, each Guaranteed Party and its respective successors and permitted assigns.

                  Section 15. Defined Terms.  Capitalized  terms used herein and
not otherwise  defined herein shall have the meanings  assigned to such terms in
Annex A to that  certain  Participation  Agreement,  dated as of July 15,  1996,
among North American  Chemical  Company,  Harris  Chemical North America,  Inc.,
[Owner Participant],  [OP Guarantor] and U.S. Trust Company of California, N.A.,
not in its individual  capacity except as otherwise  expressly provided therein,
but  solely as trustee  under the Trust  Agreement,  dated as of July 12,  1996,
creating the Searles Valley Trust 1996.



                                      -10-

<PAGE>



                  IN WITNESS  WHEREOF,  HCNA has caused this HCNA Guaranty to be
executed and  delivered by its duly  authorized  officer as of the date and year
first above written.


                                       HARRIS CHEMICAL NORTH AMERICA, INC.


                                       By  _____________________________________
                                           Name:
                                           Title:





                                      -11-

<PAGE>


                                                      FORM OF GUARANTY AGREEMENT
                                                      --------------------------




- - --------------------------------------------------------------------------------

                               GUARANTY AGREEMENT
                           (Searles Valley Trust 1996)

                            dated as of July 15, 1996


                                       by


                       HARRIS CHEMICAL NORTH AMERICA, INC.


                               for the Benefit of


                              [OWNER PARTICIPANT],

                                 [OP GUARANTOR]

                                       and

                     U.S. TRUST COMPANY OF CALIFORNIA, N.A.,
                         not in its individual capacity,
                           but solely as owner trustee
                     under the Trust Agreement that creates
                  the trust identified under the title hereof.


- - --------------------------------------------------------------------------------



<PAGE>





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