IMPAC MORTGAGE HOLDINGS INC
SC 13E4/A, 1999-04-09
REAL ESTATE INVESTMENT TRUSTS
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<PAGE>
 
                      SECURITIES AND EXCHANGE COMMISSION

                               WASHINGTON, D.C.
                           ________________________
                                AMENDMENT NO. 2
                                      To
                                SCHEDULE 13E-4

                         ISSUER TENDER OFFER STATEMENT
     (PURSUANT TO SECTION 13(e)(1) OF THE SECURITIES EXCHANGE ACT OF 1934)
                           ________________________

                         IMPAC MORTGAGE HOLDINGS, INC.
                               (Name of Issuer)

                         IMPAC MORTGAGE HOLDINGS, INC.
                     (Name of Person(s) Filing Statement)

                   COMMON STOCK,  $0.01 PAR VALUE PER SHARE
                        (Title of Class of Securities)

                                 452922  10  7
                     (Cusip Number of Class of Securities)
                           ________________________

                              JOSEPH R. TOMKINSON
                            Chief Executive Officer
                         Impac Mortgage Holdings, Inc.
                              20371 Irvine Avenue
                     Santa Ana Heights, California  92707
                                (949) 556-0122
           (Name, Address and Telephone Number of Person Authorized
                to Receive Notices and Communications on Behalf
                    of the Person(s) Filing this Statement)
                           ________________________

                                   COPY TO:
                            Thomas J. Poletti, Esq.
                             Susan B. Kalman, Esq.
                             David M. Tamman, Esq.
                  Freshman, Marantz, Orlanski, Cooper & Klein
                      9100 Wilshire Boulevard, Suite 8-E
                       Beverly Hills, California  90212
                          Telephone:  (310) 273-1870
                          Facsimile:  (310) 274-8357

                               February 24, 1999
    (Date Tender Offer First Published, Sent or Given to Security Holders)

     This Amendment No. 2 amends and supplements the Issuer Tender Offer
Statement on Schedule 13E-4 filed February 24, 1999, as amended on March 24,
1999, by Impac Mortgage Holdings, Inc. (the "Company") relating to an offer by
the Company to exchange up to $35,000,000, aggregate principal amount of its 11%
Senior Subordinated Debentures due 2004 for up to 5,000,000 Shares of its Common
Stock, par value $.01 per share (the "Common Stock," including the associated
Preferred Stock Purchase Rights (the "Rights," and together with the Common
Stock, the "Shares")).  Upon the terms and subject to the conditions set forth
in the Company's Offering 
<PAGE>
 
Circular dated February 24, 1999 relating to the Exchange Offer (the "Offering
Circular") and the related Letter of Transmittal, as amended hereby, (which are
herein collectively referred to as the "Exchange Offer"), copies of such
documents are filed as Exhibit (a)(1) and Exhibit (a)(2), respectively, to this
Statement. The purpose of this Amendment is to add Exhibit (a)(11) and Exhibit
(a)(12).

Item 8.  Additional Information.

     Item 8. Is hereby amended by adding the following:

     The Exchange Offer expired on Friday, March 26, 1999 at 5:00 p.m. New York
City time. In accordance with the terms of the Exchange Offer, the Company
accepted for exchange all 1,359,507 validly tendered shares of Common Stock.
The exchange price of $5.70 per share was issued in 11% Senior Subordinated
Debentures.  The Debentures are listed on the American Stock Exchange under the
symbol "IMHA." The 1,359,507 shares purchased represented approximately 5.5% of
the shares outstanding as of March 26, 1999.  The Company now has 22,723,477
shares outstanding.

Item 9.  Material to Be Filed as Exhibits.

     Item 9. Is hereby amended by the addition of the following Exhibits:

     (a)  (11) Indenture between the Company and IBJ Whitehall Bank & Trust
               Company, dated March 29, 1999
     (a)  (12) First Supplemental Indenture to Indenture between the Company
               and IBJ Whitehall Bank & Trust Company, dated March 29, 1999

                                   SIGNATURE

     After due inquiry and to the best of my knowledge and belief, I certify
that the information set forth in this statement is true, complete and correct.

                                          IMPAC MORTGAGE HOLDINGS, INC.,
 



Dated: April 9, 1999                          
                                          /s/ Richard J. Johnson
                                          ________________________________
                                          Richard J. Johnson
                                          Executive Vice President and
                                          Chief Financial Officer

                                       2
<PAGE>
 
                                 EXHIBIT INDEX


<TABLE>
<CAPTION>
EXHIBIT NO.      DESCRIPTION
- -----------      -----------
<C>              <S>
99.(a)(11)       Indenture between the Company and IBJ Whitehall Bank & Trust
                 Company, dated March 29, 1999

99.(a)(12)       First Supplemental Indenture to Indenture between the Company
                 and IBJ Whitehall Bank & Trust Company, dated March 29, 1999
 
</TABLE>

                                       3

<PAGE>
 
                                                              EXHIBIT 99(a)(11)




                         IMPAC MORTGAGE HOLDINGS, INC.


                                      AND

                       IBJ WHITEHALL BANK & TRUST COMPANY

                                   As Trustee


                                   INDENTURE


                          Dated as of March 29, 1999

  (For Subordinated Securities or, if Article Fourteen is made non-applicable

             (as permitted by Section 301), for Senior Securities)
<PAGE>
 
Certain Sections of this Indenture relating to Sections 310 through 318,
inclusive, of the Trust Indenture Act of 1939:

<TABLE>
<CAPTION>
Trust Indenture Act Section                        Indenture Section
<S>                                                <C>
Section 310   (a)(1)............................................ 609
              (a)(2)............................................ 609
              (a)(3)................................. Not Applicable
              (a)(4)................................. Not Applicable
              (a)(5)............................................ 609
              (b)............................................... 608
                 ............................................... 609
Section 311   (a)............................................... 613
              (b)............................................... 613
Section 312   (a)............................................... 701
                 ............................................... 702
              (b)............................................... 702
              (c)............................................... 702
Section 313   (a)............................................... 703
              (b)............................................... 703
              (c)............................................... 703
              (d)............................................... 703
Section 314   (a)............................................... 704
              (a)(4)............................................ 101
                 ...............................................1004
              (b).................................... Not Applicable
              (c)(1)............................................ 102
              (c)(2)............................................ 102
              (c)(3)............................................1304
              (d).................................... Not Applicable
              (e)............................................... 102
Section 315   (a)............................................... 601
              (b)............................................... 602
              (c)............................................... 601
              (d)............................................... 601
                 ................................................607
              (e)............................................... 514
Section 316   (a)............................................... 101
              (a)(1)(A)......................................... 502
                 ............................................... 512
              (a)(1)(B)......................................... 513
              (a)(2)................................. Not Applicable
              (b)............................................... 508
              (c)............................................... 104
Section 317   (a)(1)............................................ 503
                 ............................................... 505
</TABLE> 
<PAGE>
 
<TABLE> 
<S>                                                <C>

              (a)(2)............................................ 504
              (b)...............................................1003
Section 318   (a)............................................... 107
</TABLE>

Note: This reconciliation and tie shall not, for any purpose, be deemed to be a
part of the Indenture.
<PAGE>
 
                               TABLE OF CONTENTS
                               -----------------
<TABLE>
<CAPTION>
                                                                                 Page
                                                                                 ----
<S>                                                                              <C>

ARTICLE ONE DEFINITIONS AND OTHER PROVISIONSOF GENERAL APPLICATION..............    1
    Section 101.    Definitions.................................................    1
    Section 102.    Compliance Certificates and Opinions........................    8
    Section 103.    Form of Documents Delivered to Trustee......................    9
    Section 104.    Acts of Holders; Record Dates...............................    9
    Section 105.    Notices, Etc., to Trustee and Company.......................   11
    Section 106.    Notice to Holders; Waiver...................................   11
    Section 107.    Conflict with Trust Indenture Act...........................   12
    Section 108.    Effect of Headings and Table of Contents....................   12
    Section 109.    Successors and Assigns......................................   12
    Section 110.    Separability Clause.........................................   12
    Section 111.    Benefits of Indenture.......................................   12
    Section 112.    Governing Law...............................................   12
    Section 113.    Legal Holidays..............................................   12

ARTICLE TWO SECURITY FORMS......................................................   13
    Section 201.    Forms Generally.............................................   13
    Section 202.    Form of Face of Security....................................   13
    Section 203.    Form of Reverse of Security.................................   15
    Section 204.    Form of Legend for Global Securities........................   18
    Section 205.    Form of Trustee's Certificate of Authentication.............   19

ARTICLE THREE THE SECURITIES....................................................   19
    Section 301.    Amount Unlimited; Issuable in Series........................   19
    Section 302.    Denominations...............................................   22
    Section 303.    Execution, Authentication, Delivery and Dating..............   22
    Section 304.    Temporary Securities........................................   23
    Section 305.    Registration, Registration of Transfer and Exchange.........   23
    Section 306.    Mutilated, Destroyed, Lost and Stolen Securities............   25
    Section 307.    Payment of Interest; Interest Rights Preserved..............   26
    Section 308.    Persons Deemed Owners.......................................   27
    Section 309.    Cancellation................................................   27
    Section 310.    Computation of Interest.....................................   27
    Section 311.    CUSIP Numbers...............................................   27

ARTICLE FOUR SATISFACTION AND DISCHARGE.........................................   28
    Section 401.    Satisfaction and Discharge of Indenture.....................   28
    Section 402.    Application of Trust Money..................................   29

ARTICLE FIVE REMEDIES...........................................................   29
    Section 501.    Events of Default...........................................   29
</TABLE>

                                       i
<PAGE>
 
<TABLE>
<S>                                                                                  <C>
    Section 502.    Acceleration of Maturity; Rescission and Annulment..............   30
    Section 503.    Collection of Indebtedness and Suits for Enforcement by Trustee.   31
    Section 504.    Trustee May File Proofs of Claim................................   31
    Section 505.    Trustee May Enforce Claims Without Possession of Securities.....   32
    Section 506.    Application of Money Collected..................................   32
    Section 507.    Limitation on Suits.............................................   32
    Section 508.    Unconditional Right of Holders to Receive Principal, Premium and
                    Interest........................................................   33
    Section 509.    Restoration of Rights and Remedies..............................   33
    Section 510.    Rights and Remedies Cumulative..................................   33
    Section 511.    Delay or Omission Not Waiver....................................   34
    Section 512.    Control by Holders..............................................   34
    Section 513.    Waiver of Past Defaults.........................................   34
    Section 514.    Undertaking for Costs...........................................   35
    Section 515.    Waiver of Usury, Stay or Extension Laws.........................   35

ARTICLE SIX THE TRUSTEE.............................................................   35
    Section 601.    Certain Duties and Responsibilities.............................   35
    Section 602.    Notice of Defaults..............................................   35
    Section 603.    Certain Rights of the Trustee...................................   36
    Section 604.    Not Responsible for Recitals or Issuance of Securities..........   37
    Section 605.    May Hold Securities.............................................   37
    Section 606.    Money Held in Trust.............................................   37
    Section 607.    Compensation and Reimbursement..................................   37
    Section 608.    Conflicting Interests...........................................   39
    Section 609.    Corporate Trustee Required; Eligibility.........................   39
    Section 610.    Resignation and Removal; Appointment of Successor...............   39
    Section 611.    Acceptance of Appointment by Successor..........................   40
    Section 612.    Merger, Conversion, Consolidation or Succession to Business.....   41
    Section 613.    Preferential Collection of Claims Against Company...............   42
    Section 614.    Appointment of Authenticating Agent.............................   42

ARTICLE SEVEN HOLDERS' LISTS AND REPORTS BY TRUSTEE AND COMPANY.....................   43
    Section 701.    Company to Furnish Trustee Names and Addresses of Holders.......   43
    Section 702.    Preservation of Information; Communications to Holders..........   43
    Section 703.    Reports by Trustee..............................................   44
    Section 704.    Reports by Company..............................................   44

ARTICLE EIGHT CONSOLIDATION, MERGER, CONVEYANCE, TRANSFER OR LEASE..................   44
    Section 801.    Company May Consolidate, Etc., Only on Certain Terms............   44
    Section 802.    Successor Substituted...........................................   45

ARTICLE NINE SUPPLEMENTAL INDENTURES................................................   46
    Section 901.    Supplemental Indentures Without Consent of Holders..............   46
    Section 902.    Supplemental Indentures With Consent of Holders.................   47
</TABLE>

                                      ii
<PAGE>
 
<TABLE>
<S>                                                                                  <C>
   Section 903.    Execution of Supplemental Indentures.............................   48
   Section 904.    Effect of Supplemental Indentures................................   48
   Section 905.    Conformity with Trust Indenture Act..............................   48
   Section 906.    Reference in Securities to Supplemental Indentures...............   48

ARTICLE TEN COVENANTS...............................................................   48
   Section 1001.   Payment of Principal, Premium and Interest......................    48
   Section 1002.   Maintenance of Office or Agency.................................    49
   Section 1003.   Money for Securities Payments to Be Held in Trust...............    49
   Section 1004.   Statement by Officers as to Default.............................    50
   Section 1005.   Existence.......................................................    50
   Section 1006.   Maintenance of Properties.......................................    50
   Section 1007.   Payment of Taxes and Other Claims...............................    51
   Section 1008.   Waiver of Certain Covenants.....................................    51
   Section 1009.   Calculation of Original Issue Discount..........................    51

ARTICLE ELEVEN REDEMPTION OF SECURITIES.............................................   51
   Section 1101.   Applicability of Article.........................................   51
   Section 1102.   Election to Redeem; Notice to Trustee............................   52
   Section 1103.   Selection by Trustee of Securities to Be Redeemed................   52
   Section 1104.   Notice of Redemption.............................................   53
   Section 1105.   Deposit of Redemption Price......................................   54
   Section 1106.   Securities Payable on Redemption Date............................   54
   Section 1107.   Securities Redeemed in Part......................................   54

ARTICLE TWELVE SINKING FUNDS........................................................   54
   Section 1201.   Applicability of Article.........................................   55
   Section 1202.   Satisfaction of Sinking Fund Payments with Securities............   55
   Section 1203.   Redemption of Securities for Sinking Fund........................   55

ARTICLE THIRTEEN DEFEASANCE AND COVENANT DEFEASANCE.................................   56
   Section 1301.   Company's Option to Effect Defeasance or Covenant Defeasance.....   56
   Section 1302.   Defeasance and Discharge.........................................   56
   Section 1303.   Covenant Defeasance..............................................   56
   Section 1304.   Conditions to Defeasance or Covenant Defeasance..................   57
   Section 1305.   Deposited Money and U.S. Government Obligations to Be Held
                   in Trust; Miscellaneous Provisions...............................   59
   Section 1306.   Reinstatement....................................................   59

ARTICLE FOURTEEN SUBORDINATION OF SECURITIES........................................   60
   Section 1401.   Securities Subordinate to Senior Indebtedness....................   60
   Section 1402.   Suspension of Payment When Senior Indebtedness in Default........   60
   Section 1403.   Payment Over of Proceeds Upon Dissolution, Etc...................   61
   Section 1404.   Monies Held in Trust.............................................   62
   Section 1405.   Subrogation to Rights of Holders of Senior Indebtedness..........   63
</TABLE>

                                      iii
<PAGE>
 
<TABLE>
<S>                                                                                 <C>
   Section 1406.   Unconditional Obligation........................................   63
   Section 1407.   Trustee to Effectuate Subordination.............................   63
   Section 1408.   Notice to Trustee...............................................   63
   Section 1409.   Rights of Trustee as Holder of Senior Indebtedness; Preservation
                   of Trustee's Rights.............................................   65
   Section 1410.   Trustee Not Fiduciary for Holders of Senior Indebtedness........   65
   Section 1411.   No Waiver of Subordination Provisions...........................   65
   Section 1412.   Defeasance of this Article Fourteen.............................   66
</TABLE>
                                      iv
<PAGE>
 
                                                                            Page
                                                                            ----




Note:  This Table of Contents shall not, for any purpose, be deemed to be a part
of the Indenture.


                                       v
<PAGE>
 
     INDENTURE, dated as of March 29, 1999, between Impac Mortgage Holdings,
Inc., a corporation duly organized and existing under the laws of the State of
Maryland (herein called the "Company"), having its principal office at 20371
Irvine Avenue, Santa Ana Heights, California 92707, and IBJ Whitehall Bank &
Trust Company, a New York banking corporation, as Trustee (herein called the
"Trustee").

                            Recitals of the Company

     The Company has duly authorized the execution and delivery of this
Indenture to provide for the issuance from time to time of its unsecured
debentures, notes or other evidences of indebtedness (herein called the
"Securities"), to be issued in one or more series as in this Indenture provided.

     All things necessary to make this Indenture a valid agreement of the
Company, in accordance with its terms, have been done.

     NOW, THEREFORE, THIS INDENTURE WITNESSETH:

     For and in consideration of the premises and the purchase of the Securities
by the Holders thereof, it is mutually agreed, for the equal and proportionate
benefit of all Holders of the Securities or of series thereof, as follows:

                                  ARTICLE ONE

                        DEFINITIONS AND OTHER PROVISIONS
                             OF GENERAL APPLICATION

Section 101.  Definitions.

     For all purposes of this Indenture, except as otherwise expressly provided
or unless the context otherwise requires:

          (1) the terms defined in this Article have the meanings assigned to
     them in this Article and include the plural as well as the singular;

          (2) all other terms used herein which are defined in the Trust
     Indenture Act, either directly or by reference therein, have the meanings
     assigned to them therein;

          (3) all accounting terms not otherwise defined herein have the
     meanings assigned to them in accordance with generally accepted accounting
     principles, and, except as otherwise herein expressly provided, the term
     "generally accepted accounting principles" with respect to any computation
     required or permitted hereunder shall mean such accounting principles as
     are generally accepted in the United States of America;

          (4) unless the context otherwise requires, any reference to an
     "Article" or a "Section" refers to an Article or a Section, as the case may
     be, of this Indenture; and
<PAGE>
 
          (5) the words "herein", "hereof" and "hereunder" and other words of
     similar import refer to this Indenture as a whole and not to any particular
     Article, Section or other subdivision.

     "Act", when used with respect to any Holder, has the meaning specified in
      ---                                                                     
Section 104.

     "Affiliate" of any specified Person means any other Person directly or
      ---------                                                            
indirectly controlling or controlled by or under direct or indirect common
control with such specified Person. For the purposes of this definition,
"control" when used with respect to any specified Person means 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" have meanings correlative to the
foregoing.

     "Authenticating Agent" means any Person authorized by the Trustee pursuant
      --------------------                                                     
to Section 614 to act on behalf of the Trustee to authenticate Securities of one
or more series.

     "Board of Directors" means either the board of directors of the Company or
      ------------------                                                       
any duly authorized committee of that board.

     "Board Resolution" means a copy of a resolution certified by the Secretary
      ----------------                                                         
or an Assistant Secretary of the Company to have been duly adopted by the Board
of Directors and to be in full force and effect on the date of such
certification, and delivered to the Trustee.

     "Business Day", when used with respect to any Place of Payment, means each
      ------------                                                             
Monday, Tuesday, Wednesday, Thursday and Friday which is not a day on which
banking institutions in New York, New York, or that Place of Payment are
authorized or obligated by law or executive order to close.

     "Capitalized Lease Obligation" means, as to any Person, the obligations of
      ----------------------------                                             
such Person under a lease that are required to be classified and accounted for
as capital lease obligations under GAAP and, for purposes of this definition,
the amount of such obligations at any date shall be the capitalized amount of
such obligations at such date, determined in accordance with GAAP.

     "Collateralized Mortgage Obligation" means an adjustable- or fixed-rate
      ----------------------------------                                    
debt obligation (bond) that is collateralized by mortgage loans or mortgage
certificates and issued by private institutions or issued or guaranteed by the
Federal National Mortgage Association, the Federal Home Loan Mortgage
Corporation or the Government National Mortgage Association.

     "Commission" means the Securities and Exchange Commission, as from time to
      ----------                                                               
time constituted, or, if at any time after the execution of this instrument such
Commission is not existing and performing the duties now assigned to it under
the Trust Indenture Act, then the body performing such duties at such time.
<PAGE>
 
     "Company" means the Person named as the "Company" in the first paragraph of
      -------                                                                   
this instrument until a successor Person shall have become such pursuant to the
applicable provisions of this Indenture, and thereafter "Company" shall mean
such successor Person.

     "Company Request" or "Company Order" means a written request or order
      ---------------      -------------                                  
signed in the name of the Company by its Chairman of the Board, its Vice
Chairman of the Board, its President or a Vice President, and by its Treasurer,
an Assistant Treasurer, its Secretary or an Assistant Secretary, and delivered
to the Trustee.

     "Conditional Notice" has the meaning specified in Section 1104.
      ------------------                                            

     "Corporate Trust Office" means the principal corporate trust office of the
      ----------------------                                                   
Trustee at which at any particular time its corporate trust business shall be
administered, which office at the date hereof is located at One State Street ,
New York, New York 10004.

     "Corporation" means a corporation, association, company, joint-stock
      -----------                                                        
company or business trust.

     "Covenant Defeasance" has the meaning specified in Section 1303.
      -------------------                                            

     "Defaulted Interest" has the meaning specified in Section 307.
      ------------------                                           

     "Defeasance" has the meaning specified in Section 1302.
      ----------                                            

     "Depositary" means, with respect to Securities of any series issuable in
      ----------                                                             
whole or in part in the form of one or more Global Securities, a clearing agency
registered under the Exchange Act that is designated to act as Depositary for
such Securities as contemplated by Section 301.

     "Designated Senior Indebtedness" means Collateralized Mortgage Obligations,
      ------------------------------                                            
Warehouse Facilities, Warehouse Indebtedness, Purchase Facilities and any other
similar facility or any other Senior Indebtedness designated by the Company as
"Designated Senior Indebtedness" from time to time.

     "Event of Default" has the meaning specified in Section 501.
      ----------------                                           

     "Exchange Act" means the Securities Exchange Act of 1934 and any statute
      ------------                                                           
successor thereto, in each case as amended from time to time.

     "Expiration Date" has the meaning specified in Section 104.
      ---------------                                           

     "GAAP" means generally accepted accounting principles in the United States
      ----                                                                     
of America as in effect from time to time.

                                       3
<PAGE>
 
     "Global Security" means a Security that evidences all or part of the
      ---------------                                                    
Securities of any series and bears the legend set forth in Section 204 (or such
legend as may be specified as contemplated by Section 301 for such Securities).

     "Holder" means a Person in whose name a Security is registered in the
      ------                                                              
Security Register.

     "Indebtedness" means with respect to any Person, without duplication, (i)
      ------------                                                            
all Obligations of such Person for borrowed money, (ii) all Obligations of such
Person evidenced by bonds, debentures, notes or other similar instruments, (iii)
all Capitalized Lease Obligations of such Person, (iv) all obligations of such
Person issued or assumed as the deferred purchase price of property, all
conditional sale obligations and all Obligations under any title retention
agreement (but excluding trade accounts payable and other similar accrued
liabilities arising in the ordinary course of business and payable in accordance
with customary terms), (v) all obligations for the reimbursement of any obligor
on any letter of credit, banker's acceptance or similar credit transaction, (vi)
guarantees and other contingent obligations in respect of Indebtedness referred
to in clauses (i) through (v) above and clause (viii) below, (vii) all
obligations of any other Person of the type referred to in clauses (i) through
(vi) which are secured by any lien on any property or asset of such Person, the
amount of such obligation being deemed to be the lesser of the fair market value
of such property or asset or the amount of the obligation so secured, and (viii)
all obligations under currency agreements and interest swap agreements of such
Person.

     "Indenture" means this instrument as originally executed and as it may from
      ---------                                                                 
time to time be supplemented or amended by one or more indentures supplemental
hereto entered into pursuant to the applicable provisions hereof, including, for
all purposes of this instrument and any such supplemental indenture, the
provisions of the Trust Indenture Act that are deemed to be a part of and govern
this instrument and any such supplemental indenture, respectively. The term
"Indenture" shall also include the terms of particular series of Securities
established as contemplated by Section 301.

     "Interest", when used with respect to an Original Issue Discount Security
      --------                                                                
which by its terms bears interest only after Maturity, means interest payable
after Maturity.

     "Interest Payment Date", when used with respect to any Security, means the
      ---------------------                                                    
Stated Maturity of an instalment of interest on such Security.

     "Investment Company Act" means the Investment Company Act of 1940 and any
      ----------------------                                                  
statute successor thereto, in each case as amended from time to time.

     "Maturity", when used with respect to any Security, means the date on which
      --------                                                                  
the principal of such Security or an instalment of principal becomes due and
payable as therein or herein provided, whether at the Stated Maturity or by
declaration of acceleration, call for redemption or otherwise.

     "Notice of Default" means a written notice of the kind specified in Section
      -----------------                                                         
501(4).


                                       4
<PAGE>
 
     "Obligations" means all obligations for principal, premium, interest,
      -----------                                                         
penalties, fees, indemnifications, reimbursements, damages and other liabilities
payable under the documentation governing any Indebtedness.

     "Officers' Certificate" means a certificate signed by the Chairman of the
      ---------------------                                                   
Board, a Vice Chairman of the Board, the President or a Vice President, and by
the Treasurer, an Assistant Treasurer, the Secretary or an Assistant Secretary,
of the Company, and delivered to the Trustee. One of the officers signing an
Officers' Certificate given pursuant to Section 1004 shall be the principal
executive, financial or accounting officer of the Company.

     "Opinion of Counsel" means a written opinion of counsel, who may be counsel
      ------------------                                                        
for the Company, or other counsel who shall be acceptable to the Trustee.

     "Original Issue Discount Security" means any Security which provides for an
      --------------------------------                                          
amount less than the principal amount thereof to be due and payable upon a
declaration of acceleration of the Maturity thereof pursuant to Section 502.

     "Outstanding", when used with respect to Securities, means, as of the date
      -----------                                                              
of determination, all Securities theretofore authenticated and delivered under
this Indenture, except:

          (1) Securities theretofore canceled by the Trustee or delivered to the
     Trustee for cancellation;

          (2) Securities for whose payment or redemption money in the necessary
     amount has been theretofore deposited with the Trustee or any Paying Agent
     (other than the Company) in trust or set aside and segregated in trust by
     the Company (if the Company shall act as its own Paying Agent) for the
     Holders of such Securities; provided that, if such Securities are to be
     redeemed, notice of such redemption has been duly given pursuant to this
     Indenture or provision therefor satisfactory to the Trustee has been made;

          (3) Securities as to which Defeasance has been effected pursuant to
     Section 1302; and

          (4) Securities which have been paid pursuant to Section 306 or in
     exchange for or in lieu of which other Securities have been authenticated
     and delivered pursuant to this Indenture, other than any such Securities in
     respect of which there shall have been presented to the Trustee proof
     satisfactory to it that such Securities are held by a bona fide purchaser
     in whose hands such Securities are valid obligations of the Company;

provided, however, that in determining whether the Holders of the requisite
principal amount of the Outstanding Securities have given, made or taken any
request, demand, authorization, direction, notice, consent, waiver or other
action hereunder as of any date, (A) the principal amount of an Original Issue
Discount Security which shall be deemed to be Outstanding shall be the amount of
the principal thereof which would be due and payable as of such date upon
acceleration of the Maturity thereof to such date pursuant to Section 502, (B)
if, as of such date, the principal amount
 
                                       5
<PAGE>
 
payable at the Stated Maturity of a Security is not determinable, the principal
amount of such Security which shall be deemed to be Outstanding shall be the
amount as specified or determined as contemplated by Section 301, (C) the
principal amount of a Security denominated in one or more foreign currencies or
currency units which shall be deemed to be Outstanding shall be the U.S. dollar
equivalent, determined as of such date in the manner provided as contemplated by
Section 301, of the principal amount of such Security (or, in the case of a
Security described in Clause (A) or (B) above, of the amount determined as
provided in such Clause), and (D) Securities owned by the Company or any other
obligor upon the Securities or any Affiliate of the Company or of such other
obligor shall be disregarded and deemed not to be Outstanding, except that, in
determining whether the Trustee shall be protected in relying upon any such
request, demand, authorization, direction, notice, consent, waiver or other
action, only Securities which the Trustee actually knows to be so owned shall be
so disregarded. Securities so owned which have been pledged in good faith may be
regarded as Outstanding if the pledgee establishes to the satisfaction of the
Trustee the pledgee's right so to act with respect to such Securities and that
the pledgee is not the Company or any other obligor upon the Securities or any
Affiliate of the Company or of such other obligor.

     "Paying Agent" means any Person authorized by the Company to pay the
      ------------                                                       
principal of or any premium or interest on any Securities on behalf of the
Company.

     "Person" means any individual, corporation, partnership, limited liability
      ------                                                                   
company, joint venture, trust, unincorporated organization or government or any
agency or political subdivision thereof.

     "Place of Payment", when used with respect to the Securities of any series,
      ----------------                                                          
means the place or places where the principal of and any premium and interest on
the Securities of that series are payable as specified as contemplated by
Section 301.

     "Predecessor Security" of any particular Security means every previous
      --------------------                                                 
Security evidencing all or a portion of the same debt as that evidenced by such
particular Security; and, for the purposes of this definition, any Security
authenticated and delivered under Section 306 in exchange for or in lieu of a
mutilated, destroyed, lost or stolen Security shall be deemed to evidence the
same debt as the mutilated, destroyed, lost or stolen Security.

     "Purchase Facility" means any Warehouse Facility in the form of a purchase
      -----------------                                                        
and sale facility pursuant to which the Company or a Subsidiary of the Company
sells Receivables to a financial institution and retains a right of first
refusal upon the subsequent resale of such Receivables by such financial
institution.

     "Receivables" means consumer, mortgage and commercial loans, equipment or
      -----------                                                             
other lease receivables and receivables purchased or originated by the Company
or any Subsidiary in the ordinary course of business; provided , however, that
for purposes of determining the amount of a Receivable at any time, such amount
shall be determined in accordance with GAAP, consistently applied, as of he most
recent practicable date.

                                       6
<PAGE>
 
     "Redemption Date", when used with respect to any Security to be redeemed,
      ---------------                                                         
means the date fixed for such redemption by or pursuant to this Indenture.

     "Redemption Price", when used with respect to any Security to be redeemed,
      ----------------                                                         
means the price at which it is to be redeemed pursuant to this Indenture.

     "Regular Record Date" for the interest payable on any Interest Payment Date
      -------------------                                                       
on the Securities of any series means the date specified for that purpose as
contemplated by Section 301.

     "Responsible Officer", when used with respect to the Trustee, means the
      -------------------                                                   
chairman or any vice-chairman of the board of directors, the chairman or any
vice-chairman of the executive committee of the board of directors, the chairman
of the trust committee, the president, any vice president, the secretary, any
assistant secretary, the treasurer, any assistant treasurer, any senior trust
officer, any trust officer or assistant trust officer, the controller or any
assistant controller or any other officer of the Trustee customarily performing
functions similar to those performed by any of the above designated officers and
also means, with respect to a particular corporate trust matter, any other
officer to whom such matter is referred because of his knowledge of and
familiarity with the particular subject.

     "Securities" has the meaning stated in the first recital of this Indenture
      ----------                                                               
and more particularly means any Securities authenticated and delivered under
this Indenture.

     "Securities Act" means the Securities Act of 1933 and any statute successor
      --------------                                                            
thereto, in each case as amended from time to time.

     "Security Register" and "Security Registrar" have the respective meanings
      -----------------       ------------------                              
specified in Section 305.

     "Senior Indebtedness" means all Obligations on any Indebtedness of the
      -------------------                                                  
Company, whether outstanding on the date of original issuance of the Securities
of any series or thereafter created, incurred or assumed, unless, in the case of
any particular Indebtedness, the instrument creating or evidencing the same or
pursuant to which the same is outstanding expressly provides that such
Indebtedness shall not be senior in right of payment to the Securities of any
series. Notwithstanding the foregoing, except as otherwise provided with respect
to a series of Securities, "Senior Indebtedness" shall not include (i) any
Indebtedness of the Company to a Subsidiary of the Company, (ii) Indebtedness
to, or guaranteed on behalf of, any stockholder, director, officer or employee
of the Company (including, without limitation, amounts owed for compensation),
(iii) any liability for federal, state, local or other taxes owed or owing by
the Company, and (iv) Indebtedness which, when incurred and without respect to
any election under Section 1111(b) of Title 11, United States Code, is without
recourse to the Company.

     "Special Record Date" for the payment of any Defaulted Interest means a
      -------------------                                                   
date fixed by the Trustee pursuant to Section 307.

                                       7
<PAGE>
 
     "Stated Maturity", when used with respect to any Security or any instalment
      ---------------                                                           
of principal thereof or interest thereon, means the date specified in such
Security as the fixed date on which the principal of such Security or such
instalment of principal or interest is due and payable.

     "Subsidiary" means, in respect of any Person, any corporation, association,
      ----------                                                                
partnership or other business entity of which more than 50% of the total voting
power of shares of capital stock or other interests (including partnership
interests) entitled (without regard to the occurrence of any contingency) to
vote in the election of directors, managers or trustees thereof is at the time
owned or controlled, directly or indirectly, by (i) such Person, (ii) such
Person and one or more other Subsidiaries of such Person or (iii) one or more
other Subsidiaries of such Person. Unless otherwise specified, "Subsidiary"
means a Subsidiary of the Company, and in no event shall be deemed to include
Impac Funding Corporation.

     "Trust Indenture Act" means the Trust Indenture Act of 1939 as in force at
      -------------------                                                      
the date as of which this instrument was executed; provided, however, that in
the event the Trust Indenture Act of 1939 is amended after such date, "Trust
Indenture Act" means, to the extent required by any such amendment, the Trust
Indenture Act of 1939 as so amended.

     "Trustee" means the Person named as the "Trustee" in the first paragraph of
      -------                                                                   
this instrument until a successor Trustee shall have become such pursuant to the
applicable provisions of this Indenture, and thereafter "Trustee" shall mean or
include each Person who is then a Trustee hereunder, and if at any time there is
more than one such Person, "Trustee" as used with respect to the Securities of
any series shall mean the Trustee with respect to Securities of that series.

     "U.S. Government Obligation" has the meaning specified in Section 1304.
      --------------------------                                            

     "Vice President", when used with respect to the Company or the Trustee,
      --------------                                                        
means any vice president, whether or not designated by a number or a word or
words added before or after the title "vice president".

     "Warehouse Facility" means any funding arrangement, including a Purchase
      ------------------                                                     
Facility, with a financial institution or other lender or purchaser, to the
extent (and only to the extent) funding thereunder is used exclusively to
finance or refinance the purchase or origination of Receivables by the Company
or a Subsidiary of the Company for the purpose of (i) pooling such Receivables
prior to securitization or (ii) sale, in each case in the ordinary course of
business.

     "Warehouse Indebtedness" means the greater of (x) the consideration
      ----------------------                                            
received by the Company or its Subsidiaries under a Warehouse Facility and (y)
in the case of a Purchase Facility, the book value of the Receivables financed
under such Warehouse Facility until such time as such Receivables are
securitized, (ii) repurchased by the Company or its Subsidiaries or (iii) sold
by the counter party under the Warehouse Facility to a Person who is not an
Affiliate of the Company.

Section 102.  Compliance Certificates and Opinions.

     Upon any application or request by the Company to the Trustee to take any
action under any provision of this Indenture, the Company shall furnish to the
Trustee an Officer's Certificate, 

                                       8
<PAGE>
 
Opinion of Counsel and such certificates and opinions as may be required under
the Trust Indenture Act. Each such certificate or opinion shall be given in the
form of an Officers' Certificate, if to be given by an officer of the Company,
or an Opinion of Counsel, if to be given by counsel, and shall comply with the
requirements of the Trust Indenture Act and any other requirements set forth in
this Indenture.

     Every certificate or opinion with respect to compliance with a condition or
covenant provided for in this Indenture shall include,

          (1) a statement that each individual signing such certificate or
     opinion has read such covenant or condition and the definitions herein
     relating thereto;

          (2) a brief statement as to the nature and scope of the examination or
     investigation upon which the statements or opinions contained in such
     certificate or opinion are based;

          (3) a statement that, in the opinion of each such individual, he has
     made such examination or investigation as is necessary to enable him to
     express an informed opinion as to whether or not such covenant or condition
     has been complied with; and

          (4) a statement as to whether, in the opinion of each such individual,
     such condition or covenant has been complied with.

Section 103.  Form of Documents Delivered to Trustee.

     In any case where several matters are required to be certified by, or
covered by an opinion of, any specified Person, it is not necessary that all
such matters be certified by, or covered by the opinion of, only one such
Person, or that they be so certified or covered by only one document, but one
such Person may certify or give an opinion with respect to some matters and one
or more other such Persons as to other matters, and any such Person may certify
or give an opinion as to such matters in one or several documents.

     Any certificate or opinion of an officer of the Company may be based,
insofar as it relates to legal matters, upon a certificate or opinion of, or
representations by, counsel, unless such officer knows, or in the exercise of
reasonable care should know, that the certificate or opinion or representations
with respect to the matters upon which his certificate or opinion is based are
erroneous. Any such certificate or opinion of counsel may be based, insofar as
it relates to factual matters, upon a certificate or opinion of, or
representations by, an officer or officers of the Company stating that the
information with respect to such factual matters is in the possession of the
Company, unless such counsel knows, or in the exercise of reasonable care should
know, that the certificate or opinion or representations with respect to such
matters are erroneous.

     Where any Person is required to make, give or execute two or more
applications, requests, consents, certificates, statements, opinions or other
instruments under this Indenture, they may, but need not, be consolidated and
form one instrument.

                                       9
<PAGE>
 
Section 104.  Acts of Holders; Record Dates.

     Any request, demand, authorization, direction, notice, consent, waiver or
other action provided or permitted by this Indenture to be given, made or taken
by Holders must be embodied in and evidenced by one or more instruments of
substantially similar tenor signed by such Holders in person or by an agent duly
appointed in writing; and, except as herein otherwise expressly provided, such
action shall become effective when such instrument or instruments are delivered
to the Trustee and, where it is hereby expressly required, to the Company. Such
instrument or instruments (and the action embodied therein and evidenced
thereby) are herein sometimes referred to as the "Act" of the Holders signing
such instrument or instruments. Proof of execution of any such instrument or of
a writing appointing any such agent shall be sufficient for any purpose of this
Indenture and (subject to Section 601) conclusive in favor of the Trustee and
the Company, if made in the manner provided in this Section.

     The fact and date of the execution by any Person of any such instrument or
writing may be proved by the affidavit of a witness of such execution or by a
certificate of a notary public or other officer authorized by law to take
acknowledgments of deeds, certifying that the individual signing such instrument
or writing acknowledged to him the execution thereof. Where such execution is by
a signer acting in a capacity other than his individual capacity, such
certificate or affidavit shall also constitute sufficient proof of his
authority. The fact and date of the execution of any such instrument or writing,
or the authority of the Person executing the same, may also be proved in any
other manner which the Trustee deems sufficient.

     The ownership of Securities shall be proved by the Security Register.

     Any request, demand, authorization, direction, notice, consent, waiver or
other Act of the Holder of any Security shall bind every future Holder of the
same Security and the Holder of every Security issued upon the registration of
transfer thereof or in exchange therefor or in lieu thereof in respect of
anything done, omitted or suffered to be done by the Trustee or the Company in
reliance thereon, whether or not notation of such action is made upon such
Security.

     The Company may set any day as a record date for the purpose of determining
the Holders of Outstanding Securities of any series entitled to give, make or
take any request, demand, authorization, direction, notice, consent, waiver or
other action provided or permitted by this Indenture to be given, made or taken
by Holders of Securities of such series, provided that the Company may not set a
record date for, and the provisions of this paragraph shall not apply with
respect to, the giving or making of any notice, declaration, request or
direction referred to in the next paragraph. If any record date is set pursuant
to this paragraph, the Holders of Outstanding Securities of the relevant series
on such record date, and no other Holders, shall be entitled to take the
relevant action, whether or not such Holders remain Holders after such record
date; provided that no such action shall be effective hereunder unless taken on
or prior to the applicable Expiration Date by Holders of the requisite principal
amount of Outstanding Securities of such series on such record date. Nothing in
this paragraph shall be construed to prevent the Company from setting a new
record date for any action for which a record date has previously been set
pursuant to this paragraph 

                                      10
<PAGE>
 
(whereupon the record date previously set shall automatically and with no action
by any Person be canceled and of no effect), and nothing in this paragraph shall
be construed to render ineffective any action taken by Holders of the requisite
principal amount of Outstanding Securities of the relevant series on the date
such action is taken. Promptly after any record date is set pursuant to this
paragraph, the Company, at its own expense, shall cause notice of such record
date, the proposed action by Holders and the applicable Expiration Date to be
given to the Trustee in writing and to each Holder of Securities of the relevant
series in the manner set forth in Section 106.

     The Trustee may set any day as a record date for the purpose of determining
the Holders of Outstanding Securities of any series entitled to join in the
giving or making of (i) any Notice of Default, (ii) any declaration of
acceleration referred to in Section 502, (iii) any request to institute
proceedings referred to in Section 507(2), or (iv) any direction referred to in
Section 512, in each case with respect to Securities of such series. If any
record date is set pursuant to this paragraph, the Holders of Outstanding
Securities of such series on such record date, and no other Holders, shall be
entitled to join in such notice, declaration, request or direction, whether or
not such Holders remain Holders after such record date; provided that no such
action shall be effective hereunder unless taken on or prior to the applicable
Expiration Date by Holders of the requisite principal amount of Outstanding
Securities of such series on such record date. Nothing in this paragraph shall
be construed to prevent the Trustee from setting a new record date for any
action for which a record date has previously been set pursuant to this
paragraph (whereupon the record date previously set shall automatically and with
no action by any Person be canceled and of no effect), and nothing in this
paragraph shall be construed to render ineffective any action taken by Holders
of the requisite principal amount of Outstanding Securities of the relevant
series on the date such action is taken. Promptly after any record date is set
pursuant to this paragraph, the Trustee, at the Company's expense, shall cause
notice of such record date, the proposed action by Holders and the applicable
Expiration Date to be given to the Company in writing and to each Holder of
Securities of the relevant series in the manner set forth in Section 106.

     With respect to any record date set pursuant to this Section, the party
hereto which sets such record date may designate any day as the "Expiration
Date" and from time to time may change the Expiration Date to any earlier or
later day; provided that no such change shall be effective unless notice of the
proposed new Expiration Date is given to the other party hereto in writing, and
to each Holder of Securities of the relevant series in the manner set forth in
Section 106, on or prior to the existing Expiration Date. If an Expiration Date
is not designated with respect to any record date set pursuant to this Section,
the party hereto which set such record date shall be deemed to have initially
designated the 180th day after such record date as the Expiration Date with
respect thereto, subject to its right to change the Expiration Date as provided
in this paragraph. Notwithstanding the foregoing, no Expiration Date shall be
later than the 180th day after the applicable record date.

     Without limiting the foregoing, a Holder entitled hereunder to take any
action hereunder with regard to any particular Security may do so with regard to
all or any part of the principal amount of such Security or by one or more duly
appointed agents each of which may do so pursuant to such appointment with
regard to all or any part of such principal amount.

                                      11
<PAGE>
 
Section 105.  Notices, Etc., to Trustee and Company.

     Any request, demand, authorization, direction, notice, consent, waiver or
Act of Holders or other document provided or permitted by this Indenture to be
made upon, given or furnished to, or filed with,

          (1) the Trustee by any Holder or by the Company shall be sufficient
     for every purpose hereunder if in writing and given by hand delivery, or
     first class mail postage prepaid or by a nationally-recognized overnight
     express courier service addressed to its Corporate Trust Office, Attention:
     Corporate Trust Trustee Administration, or

          (2) the Company by the Trustee or by any Holder shall be sufficient
     for every purpose hereunder (unless otherwise herein expressly provided) if
     in writing and mailed, first-class postage prepaid, to the Company
     addressed to it at the address of its principal office specified in the
     first paragraph of this instrument or at any other address previously
     furnished in writing to the Trustee by the Company.

Section 106.  Notice to Holders; Waiver.

     Where this Indenture provides for notice to Holders of any event, such
notice shall be sufficiently given (unless otherwise herein expressly provided)
if in writing and mailed, first-class postage prepaid, to each Holder affected
by such event, at his address as it appears in the Security Register, not later
than the latest date (if any), and not earlier than the earliest date (if any),
prescribed for the giving of such notice. In any case where notice to Holders is
given by mail, neither the failure to mail such notice, nor any defect in any
notice so mailed, to any particular Holder shall affect the sufficiency of such
notice with respect to other Holders. Where this Indenture provides for notice
in any manner, such notice may be waived in writing by the Person entitled to
receive such notice, either before or after the event, and such waiver shall be
the equivalent of such notice. Waivers of notice by Holders shall be filed with
the Trustee, but such filing shall not be a condition precedent to the validity
of any action taken in reliance upon such waiver.

     In case by reason of the suspension of regular mail service or by reason of
any other cause it shall be impracticable to give such notice by mail, then such
notification as shall be made with the approval of the Trustee shall constitute
a sufficient notification for every purpose hereunder.

Section 107.  Conflict with Trust Indenture Act.

     If any provision hereof limits, qualifies or conflicts with a provision of
the Trust Indenture Act which is required under such Act to be a part of and
govern this Indenture, the latter provision shall control. If any provision of
this Indenture modifies or excludes any provision of the Trust Indenture Act
which may be so modified or excluded, the latter provision shall be deemed to
apply to this Indenture as so modified or to be excluded, as the case may be.

                                      12
<PAGE>
 
Section 108.  Effect of Headings and Table of Contents.

     The Article and Section headings herein and the Table of Contents are for
convenience only and shall not affect the construction hereof.

Section 109.  Successors and Assigns.

     All covenants and agreements in this Indenture by the Company shall bind
its successors and assigns, whether so expressed or not.

Section 110.  Separability Clause.

     In case any provision in this Indenture or in the Securities shall be
invalid, illegal or unenforceable, the validity, legality and enforceability of
the remaining provisions shall not in any way be affected or impaired thereby.

Section 111.  Benefits of Indenture.

     Nothing in this Indenture or in the Securities, express or implied, shall
give to any Person, other than the parties hereto and their successors hereunder
and the Holders, any benefit or any legal or equitable right, remedy or claim
under this Indenture.

Section 112.  Governing Law.

     This Indenture and the Securities shall be governed by and construed in
accordance with the law of the State of California, without regard to conflicts
of laws principles thereof.

Section 113.  Legal Holidays.

     In any case where any Interest Payment Date, Redemption Date or Stated
Maturity of any Security shall not be a Business Day at any Place of Payment,
then (notwithstanding any other provision of this Indenture or of the Securities
(other than a provision of any Security which specifically states that such
provision shall apply in lieu of this Section)) payment of interest or principal
(and premium, if any) need not be made at such Place of Payment on such date,
but may be made on the next succeeding Business Day at such Place of Payment
with the same force and effect as if made on the Interest Payment Date or
Redemption Date, or at the Stated Maturity.

                                      13
<PAGE>
 
                                  ARTICLE TWO

                                SECURITY FORMS

Section 201.  Forms Generally.

     The Securities of each series shall be in substantially the form set forth
in this Article, or in such other form as shall be established by or pursuant to
a Board Resolution or in one or more indentures supplemental hereto, in each
case with such appropriate insertions, omissions, substitutions and other
variations as are required or permitted by this Indenture, and may have such
letters, numbers or other marks of identification and such legends or
endorsements placed thereon as may be required to comply with the rules of any
securities exchange or Depositary therefor or as may, consistently herewith, be
determined by the officers executing such Securities, as evidenced by their
execution thereof. If the form of Securities of any series is established by
action taken pursuant to a Board Resolution, a copy of an appropriate record of
such action shall be certified by the Secretary or an Assistant Secretary of the
Company and delivered to the Trustee at or prior to the delivery of the Company
Order contemplated by Section 303 for the authentication and delivery of such
Securities.

     The definitive Securities shall be printed, lithographed or engraved on
steel engraved borders or may be produced in any other manner, all as determined
by the officers executing such Securities, as evidenced by their execution of
such Securities.

Section 202.  Form of Face of Security.

  [Insert any legend required by the Internal Revenue Code and the regulations
                                  thereunder.]

                         IMPAC MORTGAGE HOLDINGS, INC.


No. _____________                                                  $____________

                                                             CUSIP NO. _________

     Impac Mortgage Holdings, Inc., a corporation duly organized and existing
under the laws of Maryland (herein called the "Company," which term includes any
successor Person under the Indenture hereinafter referred to), for value
received, hereby promises to pay to __________________ or registered assigns,
the principal sum of __________________ Dollars on __________________ [if the
Security is to bear interest prior to Maturity, insert --, and to pay interest
thereon from __________________ or from the most recent Interest Payment Date to
which interest has been paid or duly provided for, quarterly on
__________________ and __________________ in each year, commencing
__________________ , at the rate of __________________ % per annum, until the
principal hereof is paid or made available for payment [if applicable, insert --
, provided that any principal and premium, and any such instalment of interest,
which is overdue shall bear interest at the rate of __________________ % per
annum (to the extent 

                                      14
<PAGE>
 
that the payment of such interest shall be legally enforceable), from the dates
such amounts are due until they are paid or made available for payment, and such
interest shall be payable on demand]. The interest so payable, and punctually
paid or duly provided for, on any Interest Payment Date will, as provided in
such Indenture, be paid to the Person in whose name this Security (or one or
more Predecessor Securities) is registered at the close of business on the
Regular Record Date for such interest, which shall be the __________________ or
__________________ (whether or not a Business Day), as the case may be, next
preceding such Interest Payment Date. Any such interest not so punctually paid
or duly provided for will forthwith cease to be payable to the Holder on such
Regular Record Date and may either be paid to the Person in whose name this
Security (or one or more Predecessor Securities) is registered at the close of
business on a Special Record Date for the payment of such Defaulted Interest to
be fixed by the Trustee, notice whereof shall be given to Holders of Securities
of this series not less than 10 days prior to such Special Record Date, or be
paid at any time in any other lawful manner not inconsistent with the
requirements of any securities exchange on which the Securities of this series
may be listed, and upon such notice as may be required by such exchange, all as
more fully provided in said Indenture].

     [If the Security is not to bear interest prior to Maturity, insert -- The
principal of this Security shall not bear interest except in the case of a
default in payment of principal upon acceleration, upon redemption or at Stated
Maturity and in such case the overdue principal and any overdue premium shall
bear interest at the rate of __________________ % per annum (to the extent that
the payment of such interest shall be legally enforceable), from the dates such
amounts are due until they are paid or made available for payment. Interest on
any overdue principal or premium shall be payable on demand. Any such interest
on overdue principal or premium which is not paid on demand shall bear interest
at the rate of __________________ % per annum (to the extent that the payment of
such interest on interest shall be legally enforceable), from the date of such
demand until the amount so demanded is paid or made available for payment.
Interest on any overdue interest shall be payable on demand.]

     Payment of the principal of (and premium, if any) and [if applicable,
insert -- any such] interest on this Security will be made at the office or
agency of the Company maintained for that purpose in __________________ , in
such coin or currency of the United States of America as at the time of payment
is legal tender for payment of public and private debts [if applicable, insert--
; provided, however, that at the option of the Company payment of interest may
be made by (i) check mailed to the address of the Person entitled thereto as
such address shall appear in the Security Register, or (ii) transfer to an
account of the payee located in the United States].

     Reference is hereby made to the further provisions of this Security set
forth on the reverse hereof, which further provisions shall for all purposes
have the same effect as if set forth at this place.

     Unless the certificate of authentication hereon has been executed by the
Trustee referred to on the reverse hereof by manual signature, this Security
shall not be entitled to any benefit under the Indenture or be valid or
obligatory for any purpose.

                                      15
<PAGE>
 
     IN WITNESS WHEREOF, the Company has caused this instrument to be duly
executed.

                              IMPAC MORTGAGE HOLDINGS, INC.

                              By ____________________________________
Attest:
 


                                      16
<PAGE>
 
Section 203.  Form of Reverse of Security.

     This Security is one of a duly authorized issue of securities of the
Company (herein called the "Securities"), issued and to be issued in one or more
series under an Indenture, dated as of __________________ , 1999___________
(herein called the "Indenture", which term shall have the meaning assigned to it
in such instrument), between the Company and IBJ Whitehall Bank & Trust Company
, as Trustee (herein called the "Trustee", which term includes any successor
trustee under the Indenture), and reference is hereby made to the Indenture for
a statement of the respective rights, limitations of rights, duties and
immunities thereunder of the Company, the Trustee and the Holders of the
Securities and of the terms upon which the Securities are, and are to be,
authenticated and delivered. This Security is one of the series designated on
the face hereof [if applicable, insert --, limited in aggregate principal amount
to $__________________ ].

     [If applicable, insert -- The Securities of this series are subject to
redemption upon not less than 30 days' notice by mail, [if applicable, insert --
(1) on __________________ in any year commencing with the year
__________________ and ending with the year __________________ through operation
of the sinking fund for this series at a Redemption Price equal to 100% of the
principal amount, and (2)] at any time [if applicable, insert -- on or after
__________________ , 19__________________ ], in whole at anytime or in part from
time to time, at the election of the Company, at the following Redemption Prices
(expressed as percentages of the principal amount): If redeemed [if applicable,
insert -- on or before __________________ , and if redeemed] during the 12-month
period beginning __________________ of the years indicated,


     Year      Redemption Price          Year      Redemption Price
     ----      ----------------          ----      ----------------



and thereafter at a Redemption Price equal to __________________ % of the
principal amount, together in the case of any such redemption [if applicable,
insert -- (whether through operation of the sinking fund or otherwise)] with
accrued interest to the Redemption Date, but interest installments whose Stated
Maturity is on or prior to such Redemption Date will be payable to the Holders
of such Securities, or one or more Predecessor Securities, of record at the
close of business on the relevant Record Dates referred to on the face hereof
for such interest installments, all as provided in the Indenture.]

     [If applicable, insert -- The Securities of this series are subject to
redemption upon not less than 30 days' notice by mail, (1) on __________________
in any year commencing with the year __________________ and ending with the year
__________________ through operation of the sinking fund for this series at the
Redemption Prices for redemption through operation of the sinking fund
(expressed as percentages of the principal amount) set forth in the table below,
and (2) at any time [if applicable, insert -- on or after __________________ ],
as a whole or in part, at the election of the Company, at the Redemption Prices
for redemption otherwise than through operation of the sinking fund (expressed
as percentages of the principal amount) set forth in the table below: If
redeemed during the 12-month period beginning __________________ of the years
indicated,


                                      17
<PAGE>
 
                              Redemption Price


                            Redemption Price For  
                             Redemption Through               Redemption
                                 Operation                  Otherwise Than
                                   of the                 Through Operation
         Year                   Sinking Fund             of the Sinking Fund
                             

and thereafter at a Redemption Price equal to __________________ % of the
principal amount, together in the case of any such redemption (whether through
operation of the sinking fund or otherwise) with accrued interest to the
Redemption Date, but interest installments whose Stated Maturity is on or prior
to such Redemption Date will be payable to the Holders of such Securities, or
one or more Predecessor Securities, of record at the close of business on the
relevant Record Dates referred to on the face hereof for such interest
installments, all as provided in the Indenture.]

     [If applicable, insert -- The sinking fund for this series provides for the
redemption on __________________ in each year beginning with the year
__________________ and ending with the year __________________ of [if
applicable, insert -- not less than $__________________ ("mandatory sinking
fund") and not more than] $__________________ aggregate principal amount of
Securities of this series. Securities of this series acquired or redeemed by the
Company otherwise than through [if applicable, insert -- mandatory] sinking fund
payments may be credited against subsequent [if applicable, insert -- mandatory]
sinking fund payments otherwise required to be made [if applicable, insert -- in
the inverse order in which they become due].]

     [If the Security is subject to redemption of any kind, insert -- In the
event of redemption of this Security in part only, a new Security or Securities
of this series and of like tenor for the unredeemed portion hereof will be
issued in the name of the Holder hereof upon the cancellation hereof.]

     [If applicable, insert paragraph regarding subordination of the Security.]

     [If applicable, insert -- The Indenture contains provisions for defeasance
at any time of [the entire indebtedness of this Security] [or] [certain
restrictive covenants and Events of Default with respect to this Security] [, in
each case] upon compliance with certain conditions set forth in the Indenture.]

     [If the Security is not an Original Issue Discount Security, insert -- If
an Event of Default with respect to Securities of this series shall occur and be
continuing, the principal of the Securities of this series may be declared due
and payable in the manner and with the effect provided .]

     [If the Security is an Original Issue Discount Security, insert -- If an
Event of Default with respect to Securities of this series shall occur and be
continuing, an amount of principal of the Securities of this series may be
declared due and payable in the manner and with the effect provided in the
Indenture. Such amount shall be equal to [insert -- formula for determining the
amount]. Upon 

                                      18
<PAGE>
 
payment (i) of the amount of principal so declared due and payable and (ii) of
interest on any overdue principal, premium and interest (in each case to the
extent that the payment of such interest shall be legally enforceable), all of
the Company's obligations in respect of the payment of the principal of and
premium and interest, if any, on the Securities of this series shall terminate.]

     The Indenture permits, with certain exceptions as therein provided, the
amendment thereof and the modification of the rights and obligations of the
Company and the rights of the Holders of the Securities of each series to be
affected under the Indenture at any time by the Company and the Trustee without
the consent of any Holders in certain limited cases, and with the consent of the
Holders of a majority in principal amount of the Securities at the time
Outstanding of each series to be affected subject to certain exceptions. The
Indenture also contains provisions permitting the Holders of specified
percentages in principal amount of the Securities of each series at the time
Outstanding, on behalf of the Holders of all Securities of such series, to waive
compliance by the Company with certain provisions of the Indenture and certain
past defaults under the Indenture and their consequences. Any such consent or
waiver shall be conclusive and binding upon the Holder of this Security and upon
all future Holders of this Security and of any Security issued upon the
registration of transfer hereof or in exchange herefor or in lieu hereof,
whether or not notation of such consent or waiver is made upon this Security.

     As provided in and subject to the provisions of the Indenture, the Holder
of this Security shall not have the right to institute any proceeding with
respect to the Indenture or for the appointment of a receiver or trustee or for
any other remedy thereunder, unless such Holder shall have previously given the
Trustee written notice of a continuing Event of Default with respect to the
Securities of this series, the Holders of not less than 25% in principal amount
of the Securities of this series at the time Outstanding shall have made written
request to the Trustee to institute proceedings in respect of such Event of
Default as Trustee and offered the Trustee reasonable indemnity, and the Trustee
shall not have received from the Holders of a majority in principal amount of
Securities of this series at the time Outstanding a direction inconsistent with
such request, and shall have failed to institute any such proceeding, for 60
days after receipt of such notice, request and offer of indemnity. The foregoing
shall not apply to any suit instituted by the Holder of this Security for the
enforcement of any payment of principal hereof or any premium or interest hereon
on or after the respective due dates expressed herein.

     No reference herein to the Indenture and no provision of this Security or
of the Indenture shall alter or impair the obligation of the Company, which is
absolute and unconditional, to pay the principal of and any premium and interest
on this Security at the times, place and rate, and in the coin or currency,
herein prescribed.

     As provided in the Indenture and subject to certain limitations therein set
forth, the transfer of this Security is registrable in the Security Register,
upon surrender of this Security for registration of transfer at the office or
agency of the Company in any place where the principal of and any premium and
interest on this Security are payable, duly endorsed by, or accompanied by a
written instrument of transfer in form satisfactory to the Company and the
Security Registrar duly executed by, the Holder hereof or his attorney duly
authorized in writing, and thereupon one or more new 

                                      19
<PAGE>
 
Securities of this series and of like tenor, of authorized denominations and for
the same aggregate principal amount, will be issued to the designated transferee
or transferees.

     The Securities of this series are issuable only in registered form without
coupons in denominations of $__________________ and any integral multiple
thereof. As provided in the Indenture and subject to certain limitations therein
set forth, Securities of this series are exchangeable for a like aggregate
principal amount of Securities of this series and of like tenor of a different
authorized denomination, as requested by the Holder surrendering the same.

     No service charge shall be made for any such registration of transfer or
exchange, but the Company may require payment of a sum sufficient to cover any
tax or other governmental charge payable in connection therewith.

     Prior to due presentment of this Security for registration of transfer, the
Company, the Trustee and any agent of the Company or the Trustee may treat the
Person in whose name this Security is registered as the owner hereof for all
purposes, whether or not this Security be overdue, and neither the Company, the
Trustee nor any such agent shall be affected by notice to the contrary.

     All terms used in this Security which are defined in the Indenture shall
have the meanings assigned to them in the Indenture.

I or we assign and transfer this Security to:
 
(Insert social security or other identifying number of assignee.)
 
 
 
(Print or type name, address and zip code of assignee)

and irrevocably appoint _____________________________________________ Agent to
transfer this Security on the books of the Company. The agent may substitute
another to act for him.

Dated: _________________________________________________
Signed:_________________________________________________
(Sign exactly as name appears on the other side of this Security)

Section 204.  Form of Legend for Global Securities.

     Unless otherwise specified as contemplated by Section 301 for the
Securities evidenced thereby, every Global Security authenticated and delivered
hereunder shall bear a legend in substantially the following form:

THIS SECURITY IS A GLOBAL SECURITY WITHIN THE MEANING OF THE INDENTURE
HEREINAFTER REFERRED TO AND IS REGISTERED IN THE NAME OF A DEPOSITARY OR A
NOMINEE THEREOF. THIS SECURITY MAY NOT BE 

                                      20
<PAGE>
 
EXCHANGED IN WHOLE OR IN PART FOR A SECURITY REGISTERED, AND NO TRANSFER OF THIS
SECURITY IN WHOLE OR IN PART MAY BE REGISTERED, IN THE NAME OF ANY PERSON OTHER
THAN SUCH DEPOSITARY OR A NOMINEE THEREOF, EXCEPT IN THE LIMITED CIRCUMSTANCES
DESCRIBED IN THE INDENTURE.



                                      21
<PAGE>
 
Section 205.  Form of Trustee's Certificate of Authentication.

     The Trustee's certificates of authentication shall be in substantially the
following form:

     This is one of the Securities of the series designated therein referred to
in the within-mentioned Indenture.



                              --------------------------------------------------
                                                   As Trustee

                              By
                                ------------------------------------------------
                                                   Authorized Officer


                                 ARTICLE THREE

                                THE SECURITIES

Section 301.  Amount Unlimited; Issuable in Series.

     The aggregate principal amount of Securities which may be authenticated and
delivered under this Indenture is unlimited.

     The Securities may be issued in one or more series. There shall be
established in one or more Board Resolutions or pursuant to authority granted in
one or more Board Resolutions, and subject to Section 303, set forth, or
determined in the manner provided, in an Officers' Certificate, or established
in one or more indentures supplemental hereto, prior to the issuance of
Securities of any series,

          (1) the title of the Securities of the series (which shall distinguish
     the Securities of the series from Securities of any other series);

          (2) any limit upon the aggregate principal amount of the Securities of
     the series which may be authenticated and delivered under this Indenture
     (except for Securities authenticated and delivered upon registration of
     transfer of, or in exchange for, or in lieu of, other Securities of the
     series pursuant to Section 304, 305, 306, 906 or 1107 and except for any
     Securities which, pursuant to Section 303, are deemed never to have been
     authenticated and delivered hereunder);

          (3) the Person to whom any interest on a Security of the series shall
     be payable, if other than the Person in whose name that Security (or one or
     more Predecessor Securities) is registered at the close of business on the
     Regular Record Date for such interest;

          (4) the date or dates, or the method by which such date or dates will
     be determined, on which the principal of any Securities of the series is
     payable;

                                      22
<PAGE>
 
          (5) the rate or rates at which any Securities of the series shall bear
     interest, if any, the basis of computation of such interest (if other than
     as provided in Section 310), the date or dates from which any such interest
     shall accrue, or the method by which such date or dates will be determined,
     the Interest Payment Dates on which any such interest shall be payable the
     manner of determination of such Interest Payment Dates and the Regular
     Record Date for any such interest payable on any Interest Payment Date, or
     the method by which such date or dates will be determined;

          (6) the right, if any, to extend the interest payment periods and the
     duration of such extension;

          (7) the place or places where the principal of and any premium and
     interest on any Securities of the series shall be payable;

          (8) the period or periods within which, the price or prices at which
     and the terms and conditions upon which any Securities of the series may be
     redeemed, in whole or in part, at the option of the Company and, if other
     than by a Board Resolution, the manner in which any election by the Company
     to redeem the Securities shall be evidenced;

          (9) the obligation, if any, of the Company to redeem or purchase any
     Securities of the series pursuant to any sinking fund or analogous
     provisions or at the option of the Holder thereof and the period or periods
     within which or the date or dates on which, the price or prices at which
     and the terms and conditions upon which any Securities of the series shall
     be redeemed or purchased, in whole or in part, pursuant to such obligation;

          (10) if other than denominations of $1,000 and any integral multiple
     thereof, the denominations in which any Securities of the series shall be
     issuable;

          (11) if the amount of principal of or any premium or interest on any
     Securities of the series may be determined with reference to an index or
     pursuant to a formula, the manner in which such amounts shall be
     determined;

          (12) if other than the currency of the United States of America, the
     currency, currencies or currency units in which the principal of or any
     premium or interest on any Securities of the series shall be payable and
     the manner of determining the equivalent thereof in the currency of the
     United States of America for any purpose, including for purposes of the
     definition of "Outstanding" in Section 101;

          (13) if the principal of or any premium or interest on any Securities
     of the series is to be payable, at the election of the Company or the
     Holder thereof, in one or more currencies or currency units other than that
     or those in which such Securities are stated to be payable, the currency,
     currencies or currency units in which the principal of or any premium or
     interest on such Securities as to which such election is made shall be
     payable, the periods 

                                      23
<PAGE>
 
     within which and the terms and conditions upon which such election is to be
     made and the amount so payable (or the manner in which such amount shall be
     determined);

          (14) if other than the entire principal amount thereof, the portion of
     the principal amount of any Securities of the series which shall be payable
     upon declaration of acceleration of the Maturity thereof pursuant to
     Section 502;

          (15) if the principal amount payable at the Stated Maturity of any
     Securities of the series will not be determinable as of any one or more
     dates prior to the Stated Maturity, the amount which shall be deemed to be
     the principal amount of such Securities as of any such date for any purpose
     thereunder or hereunder, including the principal amount thereof which shall
     be due and payable upon any Maturity other than the Stated Maturity or
     which shall be deemed to be Outstanding as of any date prior to the Stated
     Maturity (or, in any such case, the  manner in which such amount deemed to
     be the principal amount shall be determined);

          (16) if applicable, that the Securities of the series, in whole or any
     specified part, shall be defeasible pursuant to Section 1302 or Section
     1303 or both such Sections and, if other than by a Board Resolution, the
     manner in which any election by the Company to defease such Securities
     shall be evidenced;

          (17) if applicable, that any Securities of the series shall be
     issuable in whole or in part in the form of one or more Global Securities
     and, in such case, the respective Depositaries for such Global Securities,
     the form of any legend or legends which shall be borne by any such Global
     Securities in addition to or in lieu of that set forth in Section 204 and
     any circumstances in addition to or in lieu of those set forth in Clause
     (2) of the last paragraph of Section 305 in which any such Global Security
     may be exchanged in whole or in part for Securities registered, and any
     transfer of such Global Security in whole or in part may be registered, in
     the name or names of Persons other than the Depositary for such Global
     Security or a nominee thereof;

          (18) any addition to or change in the Events of Default which applies
     to any Securities of the series and any change in the right of the Trustee
     or the requisite Holders of such Securities to declare the principal amount
     thereof due and payable pursuant to Section 502;

          (19) any addition to or change in the covenants set forth in Article
     Ten which applies to Securities of the series;

          (20) the non-application of, or any addition to or change in, Article
     Fourteen with respect to Securities of the series; and

          (21) any other terms of the series (which terms shall not be
     inconsistent with the provisions of this Indenture, except as permitted by
     Section 901(5)).

                                      24
<PAGE>
 
     All Securities of any one series shall be substantially identical except as
to denomination and except as may otherwise be provided in or pursuant to the
Board Resolution referred to above and (subject to Section 303) set forth, or
determined in the manner provided, in the Officers' Certificate referred to
above or in any such indenture supplemental hereto.

     If any of the terms of the series are established by action taken pursuant
to a Board Resolution, a copy of an appropriate record of such action shall be
certified by the Secretary or an Assistant Secretary of the Company and
delivered to the Trustee at or prior to the delivery of the Officers'
Certificate setting forth the terms of the series.

Section 302.  Denominations.

     The Securities of each series shall be issuable only in registered form
without coupons and only in such denominations as shall be specified as
contemplated by Section 301. In the absence of any such specified denomination
with respect to the Securities of any series, the Securities of such series
shall be issuable in denominations of $1,000 and any integral multiple thereof.

Section 303.  Execution, Authentication, Delivery and Dating.

     The Securities shall be executed on behalf of the Company by its Chairman
of the Board, its Vice Chairman of the Board, its President or one of its Vice
Presidents, and attested by its Secretary or one of its Assistant Secretaries.
The signature of any of these officers on the Securities may be manual or
facsimile.

     Securities bearing the manual or facsimile signatures of individuals who
were at any time the proper officers of the Company shall bind the Company,
notwithstanding that such individuals or any of them have ceased to hold such
offices prior to the authentication and delivery of such Securities or did not
hold such offices at the date of such Securities.

     At any time and from time to time after the execution and delivery of this
Indenture, the Company may deliver Securities of any series executed by the
Company to the Trustee for authentication, together with a Company Order for the
authentication and delivery of such Securities, and the Trustee in accordance
with the Company Order shall authenticate and deliver such Securities. If the
form or terms of the Securities of the series have been established by or
pursuant to one or more Board Resolutions as permitted by Sections 201 and 301,
in authenticating such Securities, and accepting the additional responsibilities
under this Indenture in relation to such Securities, the Trustee shall be
entitled to receive, and (subject to Section 601) shall be fully protected in
relying upon, an Opinion of Counsel stating,

          (1) if the form of such Securities has been established by or pursuant
     to Board Resolution as permitted by Section 201, that such form has been
     established in conformity with the provisions of this Indenture;

                                      25
<PAGE>
 
          (2) if the terms of such Securities have been established by or
     pursuant to Board Resolution as permitted by Section 301, that such terms
     have been established in conformity with the provisions of this Indenture;
     and

          (3) that such Securities, when authenticated and delivered by the
     Trustee and issued by the Company in the manner and subject to any
     conditions specified in such Opinion of Counsel, will constitute valid and
     legally binding obligations of the Company enforceable in accordance with
     their terms, subject to bankruptcy, insolvency, fraudulent transfer,
     reorganization, moratorium and similar laws of general applicability
     relating to or effecting creditors' rights and to general equity
     principles.

If such form or terms have been so established, the Trustee shall not be
required to authenticate such Securities if the issue of such Securities
pursuant to this Indenture will affect the Trustee's own rights, duties or
immunities under the Securities and this Indenture or otherwise in a manner
which is not reasonably acceptable to the Trustee.

     Notwithstanding the provisions of Section 301 and of the preceding
paragraph, if all Securities of a series are not to be originally issued at one
time, it shall not be necessary to deliver the Officers' Certificate otherwise
required pursuant to Section 301 or the Company Order and Opinion of Counsel
otherwise required pursuant to such preceding paragraph at or prior to the
authentication of each Security of such series if such documents are delivered
at or prior to the authentication upon original issuance of the first Security
of such series to be issued.  Each Security shall be dated the date of its
authentication.

     No Security shall be entitled to any benefit under this Indenture or be
valid or obligatory for any purpose unless there appears on such Security a
certificate of authentication substantially in the form provided for herein
executed by the Trustee by manual signature, and such certificate upon any
Security shall be conclusive evidence, and the only evidence, that such Security
has been duly authenticated and delivered hereunder. Notwithstanding the
foregoing, if any Security shall have been authenticated and delivered hereunder
but never issued and sold by the Company, and the Company shall deliver such
Security to the Trustee for cancellation as provided in Section 309, for all
purposes of this Indenture such Security shall be deemed never to have been
authenticated and delivered hereunder and shall never be entitled to the
benefits of this Indenture.

Section 304.  Temporary Securities.

     Pending the preparation of definitive Securities of any series, the Company
may execute, and upon Company Order the Trustee shall authenticate and deliver,
temporary Securities which are printed, lithographed, typewritten, mimeographed
or otherwise produced, in any authorized denomination, substantially of the
tenor of the definitive Securities in lieu of which they are issued and with
such appropriate insertions, omissions, substitutions and other variations as
the officers executing such Securities may determine, as evidenced by their
execution of such Securities.

     If temporary Securities of any series are issued, the Company will cause
definitive Securities of that series to be prepared without unreasonable delay.
After the preparation of definitive Securities of such series, the temporary
Securities of such series shall be exchangeable for definitive Securities 

                                      26
<PAGE>
 
of such series upon surrender of the temporary Securities of such series at the
office or agency of the Company in a Place of Payment for that series, without
charge to the Holder. Upon surrender for cancellation of any one or more
temporary Securities of any series, the Company shall execute and the Trustee
shall authenticate and deliver in exchange therefor one or more definitive
Securities of the same series, of any authorized denominations and of like tenor
and aggregate principal amount. Until so exchanged, the temporary Securities of
any series shall in all respects be entitled to the same benefits under this
Indenture as definitive Securities of such series and tenor.

Section 305.  Registration, Registration of Transfer and Exchange.

     The Company shall cause to be kept at the Corporate Trust Office of the
Trustee a register (the register maintained in such office or in any other
office or agency of the Company in a Place of Payment being herein sometimes
referred to as the "Security Register") in which, subject to such reasonable
regulations as it may prescribe, the Company shall provide for the registration
of Securities and of transfers of Securities. The Trustee is hereby appointed
"Security Registrar" for the purpose of registering Securities and transfers of
Securities as herein provided.

     Upon surrender for registration of transfer of any Security of a series at
the office or agency of the Company in a Place of Payment for that series, the
Company shall execute, and the Trustee shall authenticate and deliver, in the
name of the designated transferee or transferees, one or more new Securities of
the same series, of any authorized denominations and of like tenor and aggregate
principal amount.

     At the option of the Holder, Securities of any series may be exchanged for
other Securities of the same series, of any authorized denominations and of like
tenor and aggregate principal amount, upon surrender of the Securities to be
exchanged at such office or agency. Whenever any Securities are so surrendered
for exchange, the Company shall execute, and the Trustee shall authenticate and
deliver, the Securities which the Holder making the exchange is entitled to
receive.

     All Securities issued upon any registration of transfer or exchange of
Securities shall be the valid obligations of the Company, evidencing the same
debt, and entitled to the same benefits under this Indenture, as the Securities
surrendered upon such registration of transfer or exchange.

     Every Security presented or surrendered for registration of transfer or for
exchange shall (if so required by the Company or the Trustee) be duly endorsed,
or be accompanied by a written instrument of transfer in form satisfactory to
the Company and the Security Registrar duly executed, by the Holder thereof or
his attorney duly authorized in writing.

     No service charge shall be made for any registration of transfer or
exchange of Securities, but the Company may require payment of a sum sufficient
to cover any tax or other governmental charge that may be imposed in connection
with any registration of transfer or exchange of Securities, other than
exchanges pursuant to Section 304, 906 or 1107 not involving any transfer.

     If the Securities of any series (or of any series and specified tenor) are
to be redeemed, the Company shall not be required (A) to issue, register the
transfer of or exchange any Securities of that 

                                      27
<PAGE>
 
series (or of that series and specified tenor, as the case may be) during a
period beginning at the opening of business 15 days before the day of the
mailing of a notice of redemption of any such Securities selected for redemption
and ending at the close of business on the day of such mailing, or (B) to
register the transfer of or exchange any Security so selected for redemption in
whole or in part, except the unredeemed portion of any Security being redeemed
in part.

     The provisions of Clauses (1), (2), (3) and (4) below shall apply only to
Global Securities:

          (1) Each Global Security authenticated under this Indenture shall be
     registered in the name of the Depositary designated for such Global
     Security or a nominee thereof and delivered to such Depositary or a nominee
     thereof or custodian therefor, and each such Global Security shall
     constitute a single Security for all purposes of this Indenture.

          (2) Notwithstanding any other provision in this Indenture, no Global
     Security may be exchanged in whole or in part for Securities registered and
     no transfer of a Global Security in whole or in part may be registered, in
     the name of any Person other than the Depositary for such Global Security
     or a nominee thereof unless (A) such Depositary (i) has notified the
     Company that it is unwilling or unable to continue as Depositary for such
     Global Security or (ii) has ceased to be a clearing agency registered under
     the Exchange Act, (B) there shall have occurred and be continuing an Event
     of Default with respect to such Global Security, (C) the Company executes
     and delivers to the Trustee a Company Order that such Global Security shall
     be so transferable or exchangeable, or (D) there shall exist such
     circumstances, if any, in addition to or in lieu of the foregoing as have
     been specified for this purpose as contemplated by Section 301.

          (3) Subject to Clause (2) above, any exchange of a Global Security for
     other Securities may be made in whole or in part, and all Securities issued
     in exchange for a Global Security or any portion thereof shall be
     registered in such names as the Depositary for such Global Security shall
     direct.

          (4) Every Security authenticated and delivered upon registration of
     transfer of, or in exchange for or in lieu of, a Global Security or any
     portion thereof, whether pursuant to this Section, Section 304, 306, 906 or
     1107 or otherwise, shall be authenticated and delivered in the form of, and
     shall be, a Global Security, unless such Security is registered in the name
     of a Person other than the Depositary for such Global Security or a nominee
     thereof.

Section 306.  Mutilated, Destroyed, Lost and Stolen Securities.

     If any mutilated Security is surrendered to the Trustee, the Company shall
execute and the Trustee shall authenticate and deliver in exchange therefor a
new Security of the same series and of like tenor and principal amount and
bearing a number not contemporaneously outstanding.

     If there shall be delivered to the Company and the Trustee (i) evidence to
their satisfaction of the destruction, loss or theft of any Security and (ii)
such security or indemnity as may be required 

                                      28
<PAGE>
 
by them to save each of them and any agent of either of them harmless, then, in
the absence of notice to the Company or the Trustee that such Security has been
acquired by a bona fide purchaser, the Company shall execute and the Trustee
shall authenticate and deliver, in lieu of any such destroyed, lost or stolen
Security, a new Security of the same series and of like tenor and principal
amount and bearing a number not contemporaneously outstanding.

     In case any such mutilated, destroyed, lost or stolen Security has become
or is about to become due and payable, the Company in its discretion may,
instead of issuing a new Security, pay such Security.

     Upon the issuance of any new Security under this Section, the Company may
require the payment of a sum sufficient to cover any tax or other governmental
charge that may be imposed in relation thereto and any other expenses (including
the fees and expenses of the Trustee) connected therewith.

     Every new Security of any series issued pursuant to this Section in lieu of
any destroyed, lost or stolen Security shall constitute an original additional
contractual obligation of the Company, whether or not the destroyed, lost or
stolen Security shall be at any time enforceable by anyone, and shall be
entitled to all the benefits of this Indenture equally and proportionately with
any and all other Securities of that series duly issued hereunder.

     The provisions of this Section are exclusive and shall preclude (to the
extent lawful) all other rights and remedies with respect to the replacement or
payment of mutilated, destroyed, lost or stolen Securities.

Section 307.  Payment of Interest; Interest Rights Preserved.

     Except as otherwise provided as contemplated by Section 301 with respect to
any series of Securities, interest on any Security which is payable, and is
punctually paid or duly provided for, on any Interest Payment Date shall be paid
to the Person in whose name that Security (or one or more Predecessor
Securities) is registered at the close of business on the Regular Record Date
for such interest, at the office or agency of the Company maintained for that
purpose in a Place of Payment for such series of Securities, in such coin or
currency of the United States of America as at the time of payment is legal
tender for payment of public and private debts; provided, however, that at the
option of the Company payment of interest may be made by (i) check mailed to the
address of the Person entitled thereto as such address shall appear in the
Security Register or (ii) transfer to an account maintained by the payee located
inside the United States.

     Any interest on any Security of any series which is payable, but is not
punctually paid or duly provided for, on any Interest Payment Date (herein
called "Defaulted Interest") shall forthwith cease to be payable to the Holder
on the relevant Regular Record Date by virtue of having been such Holder, and
such Defaulted Interest may be paid by the Company, at its election in each
case, as provided in Clause (1) or (2) below:

                                      29
<PAGE>
 
          (1) The Company may elect to make payment of any Defaulted Interest to
     the Persons in whose names the Securities of such series (or their
     respective Predecessor Securities) are registered at the close of business
     on a Special Record Date for the payment of such Defaulted Interest, which
     shall be fixed in the following manner. The Company shall notify the
     Trustee in writing of the amount of Defaulted Interest proposed to be paid
     on each Security of such series and the date of the proposed payment, and
     at the same time the Company shall deposit with the Trustee an amount of
     money equal to the aggregate amount proposed to be paid in respect of such
     Defaulted Interest or shall make arrangements satisfactory to the Trustee
     for such deposit prior to the date of the proposed payment, such money when
     deposited to be held in trust for the benefit of the Persons entitled to
     such Defaulted Interest as in this Clause provided. Thereupon the Trustee
     shall fix a Special Record Date for the payment of such Defaulted Interest
     which shall be not more than 15 days and not less than 10 days prior to the
     date of the proposed payment and not less than 10 days after the receipt by
     the Trustee of the notice of the proposed payment.  The Trustee shall
     promptly notify the Company of such Special Record Date and, in the name
     and at the expense of the Company, shall cause notice of the proposed
     payment of such Defaulted Interest and the Special Record Date therefor to
     be given to each Holder of Securities of such series in the manner set
     forth in Section 106, not less than 10 days prior to such Special Record
     Date. Notice of the proposed payment of such Defaulted Interest and the
     Special Record Date therefor having been so mailed, such Defaulted Interest
     shall be paid to the Persons in whose names the Securities of such series
     (or their respective Predecessor Securities) are registered at the close of
     business on such Special Record Date and shall no longer be payable
     pursuant to the following Clause (2).

          (2) The Company may make payment of any Defaulted Interest on the
     Securities of any series in any other lawful manner not inconsistent with
     the requirements of any securities exchange on which such Securities may be
     listed, and upon such notice as may be required by such exchange, if, after
     notice given by the Company to the Trustee of the proposed payment pursuant
     to this Clause, such manner of payment shall be deemed practicable by the
     Trustee.

     Subject to the foregoing provisions of this Section, each Security
delivered under this Indenture upon registration of transfer of or in exchange
for or in lieu of any other Security shall carry the rights to interest accrued
and unpaid, and to accrue, which were carried by such other Security.

Section 308.  Persons Deemed Owners.

     Prior to due presentment of a Security for registration of transfer, the
Company, the Trustee and any agent of the Company or the Trustee may treat the
Person in whose name such Security is registered as the owner of such Security
for the purpose of receiving payment of principal of and any premium and
(subject to Section 307) any interest on such Security and for all other
purposes whatsoever, whether or not such Security be overdue, and neither the
Company, the Trustee nor any agent of the Company or the Trustee shall be
affected by notice to the contrary.

                                      30
<PAGE>
 
Section 309.  Cancellation.

     All Securities surrendered for payment, redemption, registration of
transfer or exchange or for credit against any sinking fund payment shall, if
surrendered to any Person other than the Trustee, be delivered to the Trustee
and shall be promptly canceled by it. The Company may at any time deliver to the
Trustee for cancellation any Securities previously authenticated and delivered
hereunder which the Company may have acquired in any manner whatsoever, and may
deliver to the Trustee (or to any other Person for delivery to the Trustee) for
cancellation any Securities previously authenticated hereunder which the Company
has not issued and sold, and all Securities so delivered shall be promptly
canceled by the Trustee. No Securities shall be authenticated in lieu of or in
exchange for any Securities canceled as provided in this Section, except as
expressly permitted by this Indenture. All canceled Securities held by the
Trustee shall be disposed of as directed by a Company Order.

Section 310.  Computation of Interest.

     Except as otherwise specified as contemplated by Section 301 for Securities
of any series, interest on the Securities of each series shall be computed on
the basis of a 360-day year of twelve 30-day months.

Section 311.  CUSIP Numbers.

     The Company in issuing the Securities may use "CUSIP" numbers (if then
generally in use), and, if so, the Trustee shall use "CUSIP" numbers in notices
of redemption as a convenience to Holders; provided that any such notice may
state that no representation is made as to the correctness of such numbers
either as printed on the Securities or as contained in any notice of a
redemption and that reliance may be placed only on the other identification
numbers printed on the Securities, and any such redemption shall not be affected
by any defect in or omission of such numbers.


                                  ARTICLE FOUR

                           SATISFACTION AND DISCHARGE

Section 401.  Satisfaction and Discharge of Indenture.

     This Indenture shall upon Company Request cease to be of further effect
(except as to any surviving rights of registration of transfer or exchange of
Securities herein expressly provided for), and the Trustee, at the expense of
the Company, shall execute proper instruments acknowledging satisfaction and
discharge of this Indenture, when

                                      31
<PAGE>
 
     (1)  either

          (A) all Securities theretofore authenticated and delivered (other than
     (i) Securities which have been destroyed, lost or stolen and which have
     been replaced or paid as provided in Section 306 and (ii) Securities for
     whose payment money has theretofore been deposited in trust or segregated
     and held in trust by the Company and thereafter repaid to the Company or
     discharged from such trust, as provided in Section 1003) have been
     delivered to the Trustee for cancellation; or

          (B) all such Securities not theretofore delivered to the Trustee for
     cancellation (i) have become due and payable, or (ii) will become due and
     payable at their Stated Maturity within one year, or (iii) are to be called
     for redemption within one year under arrangements satisfactory to the
     Trustee for the giving of notice of redemption by the Trustee in the name,
     and at the expense, of the Company, and the Company, in the case of (i),
     (ii) or (iii) above, has deposited or caused to be deposited with the
     Trustee as trust funds in trust for the purpose money in an amount
     sufficient to pay and discharge the entire indebtedness on such Securities
     not theretofore delivered to the Trustee for cancellation, for principal
     and any premium and interest to the date of such deposit (in the case of
     Securities which have become due and payable) or to the Stated Maturity or
     Redemption Date, as the case may be;

     (2) the Company has paid or caused to be paid all other sums payable
hereunder by the Company; and

     (3) the Company has delivered to the Trustee an Officers' Certificate and
an Opinion of Counsel, each stating that all conditions precedent herein
provided for relating to the satisfaction and discharge of this Indenture have
been complied with.

     Notwithstanding the satisfaction and discharge of this Indenture, the
obligations of the Company to the Trustee under Section 607, the obligations of
the Company to any Authenticating Agent under Section 614 and, if money shall
have been deposited with the Trustee pursuant to subclause (B) of Clause (1) of
this Section, the obligations of the Trustee under Section 402 and the last
paragraph of Section 1003 shall survive.

Section 402.  Application of Trust Money.

     Subject to the provisions of the last paragraph of Section 1003, all money
deposited with the Trustee pursuant to Section 401 shall be held in trust and
applied by it, in accordance with the provisions of the Securities and this
Indenture, to the payment, either directly or through any Paying Agent
(including the Company acting as its own Paying Agent) as the Trustee may
determine, to the Persons entitled thereto, of the principal and any premium and
interest for whose payment such money has been deposited with the Trustee.

                                      32
<PAGE>
 
                                  ARTICLE FIVE

                                    REMEDIES

Section 501.  Events of Default.

     "Event of Default", wherever used herein with respect to Securities of any
series, means any one of the following events (whatever the reason for such
Event of Default and whether it shall be voluntary or involuntary or be effected
by operation of law or pursuant to any judgment, decree or order of any court or
any order, rule or regulation of any administrative or governmental body):

              (1) default in the payment of any interest upon any Security of
     that series when it becomes due and payable, and continuance of such
     default for a period of 30 days; or

              (2) default in the payment of the principal of or any premium on
     any Security of that series at its Maturity; or

              (3) default in the deposit of any sinking fund payment, when and
     as due by the terms of a Security of that series; or

              (4) default in the performance, or breach, of any covenant or
     warranty of the Company in this Indenture (other than a covenant or
     warranty a default in whose performance or whose breach is elsewhere in
     this Section specifically dealt with or which has expressly been included
     in this Indenture solely for the benefit of a series of Securities other
     than that series), and continuance of such default or breach for a period
     of 90 days after there has been given, by registered or certified mail, to
     the Company by the Trustee or to the Company and the Trustee by the Holders
     of at least 25% in principal amount of the Outstanding Securities of that
     series a written notice specifying such default or breach and requiring it
     to be remedied and stating that such notice is a "Notice of Default"
     hereunder; or

              (5) the entry by a court having jurisdiction in the premises of
     (A) a decree or order for relief in respect of the Company in an
     involuntary case or proceeding under any applicable Federal or state
     bankruptcy, insolvency, reorganization or other similar law or (B) a decree
     or order adjudging the Company a bankrupt or insolvent, or approving as
     properly filed a petition seeking reorganization, arrangement, adjustment
     or composition of or in respect of the Company under any applicable Federal
     or State law, or appointing a custodian, receiver, liquidator, assignee,
     trustee, sequestrator or other similar official of the Company or of any
     substantial part of its property, or ordering the winding up or liquidation
     of its affairs, and the continuance of any such decree or order for relief
     or any such other decree or order unstayed and in effect for a period of 90
     consecutive days; or

              (6) the commencement by the Company of a voluntary case or
     proceeding under any applicable Federal or state bankruptcy, insolvency,
     reorganization or other similar law or of any other case or proceeding to
     be adjudicated a bankrupt or insolvent, or the consent by it to the entry
     of a decree or order for relief in respect of the Company in an involuntary
     case or proceeding under any applicable Federal or state bankruptcy,
     insolvency,

                                      33
<PAGE>
 
     reorganization or other similar law or to the commencement of any
     bankruptcy or insolvency case or proceeding against it, or the filing by it
     of a petition or answer or consent seeking reorganization or relief under
     any applicable Federal or state law, or the consent by it to the filing of
     such petition or to the appointment of or taking possession by a custodian,
     receiver, liquidator, assignee, trustee, sequestrator or other similar
     official of the Company or of any substantial part of its property, or the
     making by it of an assignment for the benefit of creditors, or the
     admission by it in writing of its inability to pay its debts generally as
     they become due, or the taking of corporate action by the Company in
     furtherance of any such action; or

              (7) any other Event of Default provided with respect to Securities
     of that series.

Section 502.  Acceleration of Maturity; Rescission and Annulment.

     If an Event of Default (other than an Event of Default specified in Section
501(5) or 501(6)) with respect to Securities of any series at the time
Outstanding occurs and is continuing, then in every such case the Trustee or the
Holders of not less than 25% in principal amount of the Outstanding Securities
of that series may declare the principal amount of all the Securities of that
series (or, if any Securities of that series are Original Issue Discount
Securities, such portion of the principal amount of such Securities as may be
specified by the terms thereof) to be due and payable immediately, by a notice
in writing to the Company (and to the Trustee if given by Holders), and upon any
such declaration such principal amount (or specified amount) shall become
immediately due and payable. If an Event of Default specified in Section 501(5)
or 501(6) with respect to Securities of any series at the time Outstanding
occurs, the principal amount of all the Securities of that series (or, if any
Securities of that series are Original Issue Discount Securities, such portion
of the principal amount of such Securities as may be specified by the terms
thereof) shall automatically, and without any declaration or other action on the
part of the Trustee or any Holder, become immediately due and payable.

     At any time after such a declaration of acceleration with respect to
Securities of any series has been made and before a judgment or decree for
payment of the money due has been obtained by the Trustee as hereinafter in this
Article provided, the Holders of a majority in principal amount of the
Outstanding Securities of that series, by written notice to the Company and the
Trustee, may rescind and annul such declaration and its consequences if

     (1)      the Company has paid or deposited with the Trustee a sum
sufficient to pay

              (A) all overdue interest on all Securities of that series,

              (B) the principal of (and premium, if any, on) any Securities of
     that series which have become due otherwise than by such declaration of
     acceleration and any interest thereon at the rate or rates prescribed
     therefor in such Securities,

              (C) to the extent that payment of such interest is lawful,
     interest upon overdue interest at the rate or rates prescribed therefor in
     such Securities, and

                                      34
<PAGE>
 
              (D) all sums paid or advanced by the Trustee hereunder and the
     reasonable compensation, expenses, disbursements and advances of the
     Trustee, its agents and counsel;

and

     (2)      all Events of Default with respect to Securities of that series
other than the non-payment of the principal of Securities of that series which
has become due solely by such declaration of acceleration, have been cured or
waived as provided in Section 513.

No such rescission shall affect any subsequent default or impair any right
consequent thereon.

Section 503.  Collection of Indebtedness and Suits for Enforcement by Trustee.

     The Company covenants that if

              (1) default is made in the payment of any interest on any Security
     when such interest becomes due and payable and such default continues for a
     period of 30 days, or

              (2) default is made in the payment of the principal of (or
     premium, if any, on) any Security at the Maturity thereof,

the Company will, upon demand of the Trustee, pay to it, for the benefit of the
Holders of such Securities, the whole amount then due and payable on such
Securities for principal and any premium and interest and, to the extent that
payment of such interest shall be legally enforceable, interest on any overdue
principal and premium and on any overdue interest, at the rate or rates
prescribed therefor in such Securities, and, in addition thereto, such further
amount as shall be sufficient to cover the costs and expenses of collection,
including the reasonable compensation, expenses, disbursements and advances of
the Trustee, its agents and counsel.

     If an Event of Default with respect to Securities of any series occurs and
is continuing, the Trustee may in its discretion proceed to protect and enforce
its rights and the rights of the Holders of Securities of such series by such
appropriate judicial proceedings as the Trustee shall deem most effectual to
protect and enforce any such rights, whether for the specific enforcement of any
covenant or agreement in this Indenture or in aid of the exercise of any power
granted herein, or to enforce any other proper remedy.

Section 504.  Trustee May File Proofs of Claim.

     In case of any judicial proceeding relative to the Company (or any other
obligor upon the Securities), its property or its creditors, the Trustee shall
be entitled and empowered, by intervention in such proceeding or otherwise, to
take any and all actions authorized under the Trust Indenture Act in order to
have claims of the Holders and the Trustee allowed in any such proceeding. In
particular, the Trustee shall be authorized to collect and receive any moneys or
other property payable or deliverable on any such claims and to distribute the
same; and any custodian, receiver, assignee, 

                                      35
<PAGE>
 
trustee, liquidator, sequestrator or other similar official in any such judicial
proceeding is hereby authorized by each Holder to make such payments to the
Trustee and, in the event that the Trustee shall consent to the making of such
payments directly to the Holders, to pay to the Trustee any amount due it for
the reasonable compensation, expenses, disbursements and advances of the
Trustee, its agents and counsel, and any other amounts due the Trustee under
Section 607.

     No provision of this Indenture shall be deemed to authorize the Trustee to
authorize or consent to or accept or adopt on behalf of any Holder any plan of
reorganization, arrangement, adjustment or composition affecting the Securities
or the rights of any Holder thereof or to authorize the Trustee to vote in
respect of the claim of any Holder in any such proceeding; provided, however,
that the Trustee may, on behalf of the Holders, vote for the election of a
trustee in bankruptcy or similar official and be a member of a creditors' or
other similar committee.

Section 505.  Trustee May Enforce Claims Without Possession of Securities.

     All rights of action and claims under this Indenture or the Securities may
be prosecuted and enforced by the Trustee without the possession of any of the
Securities or the production thereof in any proceeding relating thereto, and any
such proceeding instituted by the Trustee shall be brought in its own name as
trustee of an express trust, and any recovery of judgment shall, after provision
for the payment of the reasonable compensation, expenses, disbursements and
advances of the Trustee, its agents and counsel, be for the ratable benefit of
the Holders of the Securities in respect of which such judgment has been
recovered.

Section 506.  Application of Money Collected.

     Any money collected by the Trustee pursuant to this Article shall be
applied in the following order, at the date or dates fixed by the Trustee and,
in case of the distribution of such money on account of principal or any premium
or interest, upon presentation of the Securities and the notation thereon of the
payment if only partially paid and upon surrender thereof if fully paid:

     First:  To the payment of all amounts due the Trustee under Section 607;

     Second:  To the payment of the amounts then due and unpaid for principal of
and any premium and interest on the Securities in respect of which or for the
benefit of which such money has been collected, ratably, without preference or
priority of any kind, according to the amounts due and payable on such
Securities for principal and any premium and interest, respectively, and

     Third:  To the payment of the balance, if any, to the Company or any other
Person or Persons legally entitled thereto.

Section 507.  Limitation on Suits.

     No Holder of any Security of any series shall have any right to institute
any proceeding, judicial or otherwise, with respect to this Indenture, or for
the appointment of a receiver or trustee, or for any other remedy hereunder,
unless

                                      36
<PAGE>
 
              (1) such Holder has previously given written notice to the Trustee
     of a continuing Event of Default with respect to the Securities of that
     series;

              (2) the Holders of not less than 25% in principal amount of the
     Outstanding Securities of that series shall have made written request to
     the Trustee to institute proceedings in respect of such Event of Default in
     its own name as Trustee hereunder;

              (3) such Holder or Holders have offered to the Trustee reasonable
     indemnity against the costs, expenses and liabilities to be incurred in
     compliance with such request;

              (4) the Trustee for 60 days after its receipt of such notice,
     request and offer of indemnity has failed to institute any such proceeding;
     and

              (5) no direction inconsistent with such written request has been
     given to the Trustee during such 60-day period by the Holders of a majority
     in principal amount of the Outstanding Securities of that series;

it being understood and intended that no one or more of such Holders shall have
any right in any manner whatever by virtue of, or by availing of, any provision
of this Indenture to affect, disturb or prejudice the rights of any other of
such Holders, or to obtain or to seek to obtain priority or preference over any
other of such Holders or to enforce any right under this Indenture, except in
the manner herein provided and for the equal and ratable benefit of all of such
Holders.

Section 508.  Unconditional Right of Holders to Receive Principal, Premium and
              Interest.

     Notwithstanding any other provision in this Indenture, the Holder of any
Security shall have the right, which is absolute and unconditional, to receive
payment of the principal of and any premium and (subject to Section 307)
interest on such Security on the respective Stated Maturities expressed in such
Security (or, in the case of redemption, except as provided in any Conditional
Notice given with respect thereto, on the Redemption Date) and to institute suit
for the enforcement of any such payment, and such rights shall not be impaired
without the consent of such Holder.

Section 509.  Restoration of Rights and Remedies.

     If the Trustee or any Holder has instituted any proceeding to enforce any
right or remedy under this Indenture and such proceeding has been discontinued
or abandoned for any reason, or has been determined adversely to the Trustee or
to such Holder, then and in every such case, subject to any determination in
such proceeding, the Company, the Trustee and the Holders shall be restored
severally and respectively to their former positions hereunder and thereafter
all rights and remedies of the Trustee and the Holders shall continue as though
no such proceeding had been instituted.

Section 510.  Rights and Remedies Cumulative.

     Except as otherwise provided with respect to the replacement or payment of
mutilated, destroyed, lost or stolen Securities in the last paragraph of Section
306, no right or remedy herein 

                                      37
<PAGE>
 
conferred upon or reserved to the Trustee or to the Holders is intended to be
exclusive of any other right or remedy, and every right and remedy shall, to the
extent permitted by law, be cumulative and in addition to every other right and
remedy given hereunder or now or hereafter existing at law or in equity or
otherwise. The assertion or employment of any right or remedy hereunder, or
otherwise, shall not prevent the concurrent assertion or employment of any other
appropriate right or remedy.

Section 511.  Delay or Omission Not Waiver.

     No delay or omission of the Trustee or of any Holder of any Securities to
exercise any right or remedy accruing upon any Event of Default shall impair any
such right or remedy or constitute a waiver of any such Event of Default or an
acquiescence therein. Every right and remedy given by this Article or by law to
the Trustee or to the Holders may be exercised from time to time, and as often
as may be deemed expedient, by the Trustee or by the Holders, as the case may
be.

Section 512.  Control by Holders.

     The Holders of a majority in principal amount of the Outstanding Securities
of any series shall have the right to direct the time, method and place of
conducting any proceeding for any remedy available to the Trustee, or exercising
any trust or power conferred on the Trustee, with respect to the Securities of
such series, provided that

              (1) such direction shall not be in conflict with any rule of law
     or with this Indenture,

              (2) the Trustee may take any other action deemed proper by the
     Trustee which is not inconsistent with such direction, and

              (3) subject to the provisions of Section 601, the Trustee shall
     have the right to decline to follow any such direction if the Trustee in
     good faith shall, by a Responsible Officer or Officers of the Trustee,
     determine that the proceeding so directed would involve the Trustee in
     personal liability.

Section 513.  Waiver of Past Defaults.

     The Holders of not less than a majority in principal amount of the
Outstanding Securities of any series may on behalf of the Holders of all the
Securities of such series waive any past default hereunder with respect to such
series and its consequences, except a default

              (1) in the payment of the principal of or any premium or interest
     on any Security of such series, or

              (2) in respect of a covenant or provision hereof which under
     Article Nine cannot be modified or amended without the consent of the
     Holder of each Outstanding Security of such series affected.

                                      38
<PAGE>
 
     Upon any such waiver, such default shall cease to exist, and any Event of
Default arising therefrom shall be deemed to have been cured, for every purpose
of this Indenture; but no such waiver shall extend to any subsequent or other
default or impair any right consequent thereon.

Section 514.  Undertaking for Costs.

     In any suit for the enforcement of any right or remedy under this
Indenture, or in any suit against the Trustee for any action taken, suffered or
omitted by it as Trustee, a court may require any party litigant in such suit to
file an undertaking to pay the costs of such suit, and may assess costs against
any such party litigant, in the manner and to the extent provided in the Trust
Indenture Act; provided that neither this Section nor the Trust Indenture Act
shall be deemed to authorize any court to require such an undertaking or to make
such an assessment in any suit instituted by the Company or the Trustee.

Section 515.  Waiver of Usury, Stay or Extension Laws.

     The Company covenants (to the extent that it may lawfully do so) that it
will not at any time insist upon, or plead, or in any manner whatsoever claim or
take the benefit or advantage of, any usury, stay or extension law wherever
enacted, now or at any time hereafter in force, which may affect the covenants
or the performance of this Indenture; and the Company (to the extent that it may
lawfully do so) hereby expressly waives all benefit or advantage of any such law
and covenants that it will not hinder, delay or impede the execution of any
power herein granted to the Trustee, but will suffer and permit the execution of
every such power as though no such law had been enacted.


                                  ARTICLE SIX

                                  THE TRUSTEE

Section 601.  Certain Duties and Responsibilities.

     The duties and responsibilities of the Trustee shall be as provided by the
Trust Indenture Act. Notwithstanding the foregoing, no provision of this
Indenture shall require the Trustee to expend or risk its own funds or otherwise
incur any financial liability in the performance of any of its duties hereunder,
or in the exercise of any of its rights or powers, if it shall have reasonable
grounds for believing that repayment of such funds or adequate indemnity against
such risk or liability is not reasonably assured to it. Whether or not therein
expressly so provided, every provision of this Indenture relating to the conduct
or affecting the liability of or affording protection to the Trustee shall be
subject to the provisions of this Section.

Section 602.  Notice of Defaults.

     If a default occurs hereunder and is actually known to the Trustee with
respect to Securities of any series, the Trustee shall give the Holders of
Securities of such series notice of such default within ninety (90) days after
its occurrence as and to the extent provided by the Trust Indenture Act;

                                      39
<PAGE>
 
provided, however, that in the case of any default of the character specified in
Section 501(4) with respect to Securities of such series, no such notice to
Holders shall be given until at least 30 days after the occurrence thereof. For
the purpose of this Section, the term "default" means any event which is, or
after notice or lapse of time or both would become, an Event of Default with
respect to Securities of such series.  Except in the case of a default in the
payment of a principal of, premium, if any, or interest on any Security, the
Trustee may withhold notice, if, and so long as, a committee of Responsible
Officers in good faith determines that withholding the notice is in the best
interest of the Holders.

Section 603.  Certain Rights of the Trustee.

Subject to the provisions of Section 601:

              (1) the Trustee may rely and shall be protected in acting or
     refraining from acting upon any resolution, certificate, statement,
     instrument, opinion, report, notice, request, direction, consent, order,
     bond, debenture, note, other evidence of indebtedness or other paper or
     document believed by it to be genuine and to have been signed or presented
     by the proper party or parties;

              (2) any demand, request, notice or direction of the Company
     mentioned herein shall be sufficiently evidenced by a Company Request or
     Company Order, and any resolution of the Board of Directors shall be
     sufficiently evidenced by a Board Resolution;

              (3) whenever in the administration of this Indenture the Trustee
     shall deem it desirable that a matter be proved or established prior to
     taking, suffering or omitting any action hereunder, the Trustee (unless
     other evidence be herein specifically prescribed) may require and, in the
     absence of bad faith on its part, rely upon an Officers' Certificate and
     shall not be liable for any action it takes or omits to take in good faith
     reliance upon such Officer's Certificate;

              (4) the Trustee may consult with counsel of its selection and the
     advice of such counsel or any Opinion of Counsel shall be full and complete
     authorization and protection in respect of any action taken, suffered or
     omitted by it hereunder in good faith and in reliance thereon;

              (5) the Trustee shall be under no obligation to exercise any of
     the rights or powers vested in it by this Indenture at the request or
     direction of any of the Holders pursuant to this Indenture, unless such
     Holders shall have offered to the Trustee reasonable security or indemnity
     against the costs, expenses and liabilities which might be incurred by it
     in compliance with such request or direction;

              (6) the Trustee shall not be bound to make any investigation into
     the facts or matters stated in any resolution, certificate, statement,
     instrument, opinion, report, notice, request, direction, consent, order,
     bond, debenture, note, other evidence of indebtedness or other paper or
     document, but the Trustee, in its discretion, may make such further inquiry
     or 

                                      40
<PAGE>
 
     investigation into such facts or matters as it may see fit, and, if the
     Trustee shall determine to make such further inquiry or investigation, it
     shall be entitled to examine the books, records and premises of the
     Company, personally or by agent or attorney; and

              (7)  the Trustee may execute any of the trusts or powers hereunder
     or perform any duties hereunder either directly or by or through agents or
     attorneys and the Trustee shall not be responsible for any misconduct or
     negligence on the part of any agent or attorney appointed with due care by
     it hereunder.

              (8)  the Trustee shall not be liable for any action it takes or
     omits to take in good faith that it believes to be authorized or within the
     rights or powers conferred upon it by this Indenture.

              (9)  the Trustee shall not be required to give any bond or surety
     in respect of its performance of its powers and duties hereunder.

              (10) Delivery of reports, information and documents to the Trustee
     under Section 704 is for informational purposes only and the Trustee's
     receipt of the foregoing shall not constitute constructive notice of any
     information contained therein or determinable from information obtained
     therein, including the Company's compliance with any of its covenants
     hereunder (as to which the Trustee is entitled to rely exclusively on
     Officers' Certificates).

              (11) the Trustee shall not be charged with knowledge of any
     Defaults or Events of Default unless either (i) a Trust Officer of the
     Trustee shall have actual knowledge of such Default or Event of Default or
     (ii) written notice of such Default or Event of Default shall have been
     given to the Trustee by any Holder or by the Company.

Section 604.  Not Responsible for Recitals or Issuance of Securities.

     The recitals contained herein and in the Securities, except the Trustee's
certificates of authentication, shall be taken as the statements of the Company,
and neither the Trustee nor any Authenticating Agent assumes any responsibility
for their correctness. The Trustee makes no representations as to the validity
or sufficiency of this Indenture or of the Securities. Neither the Trustee nor
any Authenticating Agent shall be accountable for the use or application by the
Company of Securities or the proceeds thereof.

Section 605.  May Hold Securities.

     The Trustee, any Authenticating Agent, any Paying Agent, any Security
Registrar or any other agent of the Company, in its individual or any other
capacity, may become the owner or pledgee of Securities and, subject to Sections
608 and 613, may otherwise deal with the Company with the same rights it would
have if it were not Trustee, Authenticating Agent, Paying Agent, Security
Registrar or such other agent.

                                      41
<PAGE>
 
Section 606.  Money Held in Trust.

     Money held by the Trustee in trust hereunder need not be segregated from
other funds except to the extent required by law. The Trustee shall be under no
liability for interest on any money received by it hereunder except as otherwise
agreed in writing with the Company.

Section 607.  Compensation and Reimbursement.

     The Company agrees

              (1) to pay to the Trustee from time to time such compensation as
     shall be agreed to in writing between the Company and the Trustee for all
     services rendered by it hereunder (which compensation shall not be limited
     by any provision of law in regard to the compensation of a trustee of an
     express trust);

              (2) except as otherwise expressly provided herein, to reimburse
     the Trustee upon its request for all reasonable expenses, disbursements and
     advances incurred or made by the Trustee in accordance with any provision
     of this Indenture (including the reasonable compensation, expenses and
     disbursements of its agents and counsel), except any such expense,
     disbursement or advance as may be attributable to its negligence or bad
     faith; and

              (3) to indemnify the Trustee and its officers, directors,
     shareholders, agents and employees (each, an "Indemnified Party") and holds
     the same harmless against any and all losses, liabilities or expenses
     incurred by it arising out of or in connection with the acceptance or
     administration of its duties and the exercise of its rights and powers
     under this Indenture or the Securities, including the costs and expenses of
     enforcing this Indenture against the Company (including this Section 607)
     and defending itself against any claim (whether asserted by the Company or
     any Holder or any other person) or liability in connection with the
     exercise or performance of any of its powers or duties hereunder, except to
     the extent any such loss, liability or expense may be attributable to
     negligence or bad faith. The Trustee and its officers, directors,
     shareholders, agents and employees, in its capacity as Paying Agent,
     Security, Registrar, Authentication Agent, Custodian for the Securities,
     Exchange Agent and agent for service of notices and demands and any other
     agent capacity shall have the full benefit of the foregoing indemnity.  The
     Indemnified Party shall notify the Company promptly of any claim or which
     it may seek indemnity.  Failure by the Indemnified Party to so notify the
     Company shall not relieve the Company of its obligations hereunder. The
     Company shall defend the claim and the Trustee shall cooperate in the
     defense.  If there is a conflict of interest between the Company and the
     Indemnified Party, then the Indemnified Party may have separate counsel
     reasonably satisfactory to the Indemnified Party and the Company shall pay
     the reasonable fees and expenses of such counsel.  The Trustee's right to
     receive payment of any amounts under this Indenture shall not be
     subordinate to any other indebtedness of the Company.

     The obligations of the Company under this Section 607 shall survive the
satisfaction and discharge of this Indenture.

                                      42
<PAGE>
 
     The Trustee shall have a lien prior to the Securities upon all property and
funds held by it hereunder for any amount owing it or any predecessor Trustee
pursuant to this Section 607, except with respect to funds held in trust for the
benefit of the Holders of particular Securities.  Such lien shall survive the
satisfaction and discharge of this Indenture.

     Without limiting any rights available to the Trustee under applicable law,
when the Trustee incurs expenses or renders services in connection with an Event
of Default specified in Section 501(5) or Section 501(6), the expenses
(including the reasonable charges and expenses of its counsel) and compensation
for the services are intended to constitute expenses of administration under any
applicable Federal or state bankruptcy, insolvency or other similar law.

     The provisions of this Section shall survive the termination of this
Indenture.

Section 608.  Conflicting Interests.

     If the Trustee has or shall acquire a conflicting interest within the
meaning of the Trust Indenture Act, the Trustee shall either eliminate such
interest or resign, to the extent and in the manner provided by, and subject to
the provisions of, the Trust Indenture Act and this Indenture. To the extent
permitted by such Act, the Trustee shall not be deemed to have a conflicting
interest by virtue of being a trustee under this Indenture with respect to
Securities of more than one series.

Section 609.  Corporate Trustee Required; Eligibility.

     There shall at all times be one (and only one) Trustee hereunder with
respect to the Securities of each series, which may be Trustee hereunder for
Securities of one or more other series. Each Trustee shall be a Person that is
eligible pursuant to the Trust Indenture Act to act as such and has a combined
capital and surplus of at least $50,000,000. If any such Person publishes
reports of condition at least annually, pursuant to law or to the requirements
of its supervising or examining authority, then for the purposes of this Section
and to the extent permitted by the Trust Indenture Act, the combined capital and
surplus of such Person shall be deemed to be its combined capital and surplus as
set forth in its most recent report of condition so published. If at any time
the Trustee with respect to the Securities of any series shall cease to be
eligible in accordance with the provisions of this Section, it shall resign
immediately in the manner and with the effect hereinafter specified in this
Article.  This Indenture shall always have a Trustee who satisfies the
requirements or the Trust Indenture Act.

Section 610.  Resignation and Removal; Appointment of Successor.

     No resignation or removal of the Trustee and no appointment of a successor
Trustee pursuant to this Article shall become effective until the acceptance of
appointment by the successor Trustee in accordance with the applicable
requirements of Section 611.

     The Trustee may resign at any time with respect to the Securities of one or
more series by giving written notice thereof to the Company. If the instrument
of acceptance by a successor Trustee required by Section 611 shall not have been
delivered to the Trustee within 30 days after the giving 

                                      43
<PAGE>
 
of such notice of resignation, the resigning Trustee may petition any court of
competent jurisdiction for the appointment of a successor Trustee with respect
to the Securities of such series.

     The Trustee may be removed at any time with respect to the Securities of
any series by Act of the Holders of a majority in principal amount of the
Outstanding Securities of such series, delivered to the Trustee and to the
Company.

     If at any time:

          (1) the Trustee shall fail to comply with Section 608 after written
     request therefor by the Company or by any Holder who has been a bona fide
     Holder of a Security for at least six months, or

          (2) the Trustee shall cease to be eligible under Section 609 and shall
     fail to resign after written request therefor by the Company or by any such
     Holder, or

          (3) the Trustee shall become incapable of acting or shall be adjudged
     a bankrupt or insolvent or a receiver of the Trustee or of its property
     shall be appointed or any public officer shall take charge or control of
     the Trustee or of its property or affairs for the purpose of
     rehabilitation, conservation or liquidation,

then, in any such case, (A) the Company by a Board Resolution may remove the
Trustee with respect to all Securities, or (B) subject to Section 514, any
Holder who has been a bona fide Holder of a Security for at least six months
may, on behalf of himself and all others similarly situated, petition any court
of competent jurisdiction for the removal of the Trustee with respect to all
Securities and the appointment of a successor Trustee or Trustees.

     If the Trustee shall resign, be removed or become incapable of acting, or
if a vacancy shall occur in the office of Trustee for any cause, with respect to
the Securities of one or more series, the Company, by a Board Resolution, shall
promptly appoint a successor Trustee or Trustees with respect to the Securities
of that or those series (it being understood that any such successor Trustee may
be appointed with respect to the Securities of one or more or all of such series
and that at any time there shall be only one Trustee with respect to the
Securities of any particular series) and shall comply with the applicable
requirements of Section 611. If, within one year after such resignation, removal
or incapability, or the occurrence of such vacancy, a successor Trustee with
respect to the Securities of any series shall be appointed by Act of the Holders
of a majority in principal amount of the Outstanding Securities of such series
delivered to the Company and the retiring Trustee, the successor Trustee so
appointed shall, forthwith upon its acceptance of such appointment in accordance
with the applicable requirements of Section 611, become the successor Trustee
with respect to the Securities of such series and to that extent supersede the
successor Trustee appointed by the Company. If no successor Trustee with respect
to the Securities of any series shall have been so appointed by the Company or
the Holders and accepted appointment in the manner required by Section 611, any
Holder who has been a bona fide Holder of a Security of such series for at least
six months may, on behalf of himself and all others similarly situated, petition
any court of competent jurisdiction for the appointment of a successor Trustee
with respect to the Securities of such series.

                                      44
<PAGE>
 
     The Company shall give notice of each resignation and each removal of the
Trustee with respect to the Securities of any series and each appointment of a
successor Trustee with respect to the Securities of any series to all Holders of
Securities of such series in the manner provided in Section 106. Each notice
shall include the name of the successor Trustee with respect to the Securities
of such series and the address of its Corporate Trust Office.

Section 611.  Acceptance of Appointment by Successor.

     In case of the appointment hereunder of a successor Trustee with respect to
all Securities, every such successor Trustee so appointed shall execute,
acknowledge and deliver to the Company and to the retiring Trustee an instrument
accepting such appointment, and thereupon the resignation or removal of the
retiring Trustee shall become effective and such successor Trustee, without any
further act, deed or conveyance, shall become vested with all the rights,
powers, trusts and duties of the retiring Trustee; but, on the request of the
Company or the successor Trustee, such retiring Trustee shall, upon payment of
its charges, execute and deliver an instrument transferring to such successor
Trustee all the rights, powers and trusts of the retiring Trustee and shall duly
assign, transfer and deliver to such successor Trustee all property and money
held by such retiring Trustee hereunder.

     In case of the appointment hereunder of a successor Trustee with respect to
the Securities of one or more (but not all) series, the Company, the retiring
Trustee and each successor Trustee with respect to the Securities of one or more
series shall execute and deliver an indenture supplemental hereto wherein each
successor Trustee shall accept such appointment and which (1) shall contain such
provisions as shall be necessary or desirable to transfer and confirm to, and to
vest in, each successor Trustee all the rights, powers, trusts and duties of the
retiring Trustee with respect to the Securities of that or those series to which
the appointment of such successor Trustee relates, (2) if the retiring Trustee
is not retiring with respect to all Securities, shall contain such provisions as
shall be deemed necessary or desirable to confirm that all the rights, powers,
trusts and duties of the retiring Trustee with respect to the Securities of that
or those series as to which the retiring Trustee is not retiring shall continue
to be vested in the retiring Trustee, and (3) shall add to or change any of the
provisions of this Indenture as shall be necessary to provide for or facilitate
the administration of the trusts hereunder by more than one Trustee, it being
understood that nothing herein or in such supplemental indenture shall
constitute such Trustees co-trustees of the same trust and that each such
Trustee shall be trustee of a trust or trusts hereunder separate and apart from
any trust or trusts hereunder administered by any other such Trustee; and upon
the execution and delivery of such supplemental indenture the resignation or
removal of the retiring Trustee shall become effective to the extent provided
therein and each such successor Trustee, without any further act, deed or
conveyance, shall become vested with all the rights, powers, trusts and duties
of the retiring Trustee with respect to the Securities of that or those series
to which the appointment of such successor Trustee relates; but, on request of
the Company or any successor Trustee, such retiring Trustee shall duly assign,
transfer and deliver to such successor Trustee all property and money held by
such retiring Trustee hereunder with respect to the Securities of that or those
series to which the appointment of such successor Trustee relates, provided all
sums owing to the Trustee hereunder have been paid and subject to the lien
provided for in Section 607 hereof.  Notwithstanding 

                                      45
<PAGE>
 
replacement of the Trustee pursuant to this Section 611, the Company's
obligations under Section 607 hereof shall continue for the benefit of the
retiring Trustee.

     Upon request of any such successor Trustee, the Company shall execute any
and all instruments for more fully and certainly vesting in and confirming to
such successor Trustee all such rights, powers and trusts referred to in the
first or second preceding paragraph, as the case may be.

     No successor Trustee shall accept its appointment unless at the time of
such acceptance such successor Trustee shall be qualified and eligible under
this Article.

Section 612.  Merger, Conversion, Consolidation or Succession to Business.

     Any corporation into which the Trustee may be merged or converted or with
which it may be consolidated, or any corporation resulting from any merger,
conversion or consolidation to which the Trustee shall be a party, or any
corporation succeeding to all or substantially all the corporate trust business
of the Trustee, shall be the successor of the Trustee hereunder, provided such
corporation shall be otherwise qualified and eligible under this Article,
without the execution or filing of any paper or any further act on the part of
any of the parties hereto. In case any Securities shall have been authenticated,
but not delivered, by the Trustee then in office, any successor by merger,
conversion or consolidation to such authenticating Trustee may adopt such
authentication and deliver the Securities so authenticated with the same effect
as if such successor Trustee had itself authenticated such Securities.

Section 613.  Preferential Collection of Claims Against Company.

     If and when the Trustee shall be or become a creditor of the Company (or
any other obligor upon the Securities), the Trustee shall be subject to the
provisions of the Trust Indenture Act regarding the collection of claims against
the Company (or any such other obligor).

Section 614.  Appointment of Authenticating Agent.

     The Trustee may appoint an Authenticating Agent or Agents (by giving notice
of the appointment to the Company and with respect to one or more series of
Securities, which Authenticating Agent(s) shall be authorized to act on behalf
of the Trustee to authenticate Securities of such series issued upon original
issue and upon exchange, registration of transfer or partial redemption thereof
or pursuant to Section 306, and Securities so authenticated shall be entitled to
the benefits of this Indenture and shall be valid and obligatory for all
purposes as if authenticated by the Trustee hereunder. Wherever reference is
made in this Indenture to the authentication and delivery of Securities by the
Trustee or the Trustee's certificate of authentication, such reference shall be
deemed to include authentication and delivery on behalf of the Trustee by an
Authenticating Agent and a certificate of authentication executed on behalf of
the Trustee by an Authenticating Agent.  Each Authenticating Agent shall be
reasonably acceptable to the Company and shall at all times be a corporation
organized and doing business under the laws of the United States of America, any
State thereof or the District of Columbia, authorized under such laws to act as
Authenticating Agent, having a combined capital and surplus of not less than
$50,000,000 and subject to supervision 

                                      46
<PAGE>
 
or examination by Federal or state authority. If such Authenticating Agent
publishes reports of condition at least annually, pursuant to law or to the
requirements of said supervising or examining authority, then for the purposes
of this Section, the combined capital and surplus of such Authenticating Agent
shall be deemed to be its combined capital and surplus as set forth in its most
recent report of condition so published. If at any time an Authenticating Agent
shall cease to be eligible in accordance with the provisions of this Section,
such Authenticating Agent shall resign immediately in the manner and with the
effect specified in this Section.

     Any corporation into which an Authenticating Agent may be merged or
converted or with which it may be consolidated, or any corporation resulting
from any merger, conversion or consolidation to which such Authenticating Agent
shall be a party, or any corporation succeeding to the corporate agency or
corporate trust business of an Authenticating Agent, shall continue to be an
Authenticating Agent, provided such corporation shall be otherwise eligible
under this Section, without the execution or filing of any paper or any further
act on the part of the Trustee or the Authenticating Agent.

     An Authenticating Agent may resign at any time by giving written notice
thereof to the Trustee and to the Company. The Trustee may at any time terminate
the agency of an Authenticating Agent by giving written notice thereof to such
Authenticating Agent and to the Company. Upon receiving such a notice of
resignation or upon such a termination, or in case at any time such
Authenticating Agent shall cease to be eligible in accordance with the
provisions of this Section, the Trustee may appoint a successor Authenticating
Agent which shall be reasonably acceptable to the Company and shall give notice
to the Company of such appointment.  Any successor Authenticating Agent upon
acceptance of its appointment hereunder shall become vested with all the rights,
powers and duties of its predecessor hereunder, with like effect as if
originally named as an Authenticating Agent. No successor Authenticating Agent
shall be appointed unless eligible under the provisions of this Section.

     The Company agrees to pay to each Authenticating Agent from time to time
reasonable compensation for its services under this Section.

     If an appointment with respect to one or more series is made pursuant to
this Section, the Securities of such series may have endorsed thereon, in
addition to the Trustee's certificate of authentication, an alternative
certificate of authentication in the following form:

     This is one of the Securities of the series designated therein referred to
in the within-mentioned Indenture.


                              -------------------------------------------- 
                              As Trustee

                              By
                                ------------------------------------------ 
                                    As Authenticating Agent

                              By
                                ------------------------------------------ 
                                    Authorized Officer

                                      47
<PAGE>
 
                                 ARTICLE SEVEN

               HOLDERS' LISTS AND REPORTS BY TRUSTEE AND COMPANY

Section 701.  Company to Furnish Trustee Names and Addresses of Holders.

     The Company will furnish or cause to be furnished to the Trustee

              (1) fifteen days after each Regular Record Date, a list, in such
     form as the Trustee may reasonably require, of the names and addresses of
     the Holders of Securities of each series as of such Regular Record Date,
     and

              (2) at such other times as the Trustee may request in writing,
     within 30 days after the receipt by the Company of any such request, a list
     in similar form and content as of a date not more than 15 days prior to the
     time such list is furnished;

excluding from any such list names and addresses received by the Trustee in its
capacity as Security Registrar.

Section 702.  Preservation of Information; Communications to Holders.

     The Trustee shall preserve, in as current a form as is reasonably
practicable, the names and addresses of Holders contained in the most recent
list furnished to the Trustee as provided in Section 701 and the names and
addresses of Holders received by the Trustee in its capacity as Security
Registrar. The Trustee may destroy any list furnished to it as provided in
Section 701 upon receipt of a new list so furnished.

     The rights of Holders to communicate with other Holders with respect to
their rights under this Indenture or under the Securities, and the corresponding
rights and privileges of the Trustee, shall be as provided by the Trust
Indenture Act.

     Every Holder of Securities, by receiving and holding the same, agrees with
the Company and the Trustee that neither the Company nor the Trustee nor any
agent of either of them shall be held accountable by reason of any disclosure of
information as to names and addresses of Holders made pursuant to the Trust
Indenture Act.

Section 703.  Reports by Trustee.

     The Trustee shall transmit to Holders such reports concerning the Trustee
and its actions under this Indenture as may be required pursuant to the Trust
Indenture Act at the times and in the manner provided pursuant thereto. If
required by Section 313(a) of the Trust Indenture Act, the Trustee shall, within
sixty days after each May 15 following the date of this Indenture deliver to

                                      48
<PAGE>
 
Holders a brief report, dated as of such May 15, which complies with the
provisions of such Section 313(a).

     A copy of each such report shall, at the time of such transmission to
Holders, be filed by the Trustee with each stock exchange upon which any
Securities are listed, with the Commission and with the Company. The Company
will promptly notify the Trustee when any Securities are listed on any stock
exchange.

Section 704.  Reports by Company.

     The Company shall file with the Trustee and the Commission, and transmit to
Holders, such information, documents and other reports, and such summaries
thereof, as may be required pursuant to the Trust Indenture Act at the times and
in the manner provided pursuant to such Act; provided that any such information,
documents or reports required to be filed with the Commission pursuant to
Section 13 or 15(d) of the Exchange Act shall be filed with the Trustee within
15 days after the same is so required to be filed with the Commission.


                                 ARTICLE EIGHT

              CONSOLIDATION, MERGER, CONVEYANCE, TRANSFER OR LEASE

Section 801.  Company May Consolidate, Etc., Only on Certain Terms.

     The Company shall not consolidate with or merge into any other Person or
convey, transfer or lease its properties and assets substantially as an entirety
to any Person, and the Company shall not permit any Person to consolidate with
or merge into the Company or convey, transfer or lease its properties and assets
substantially as an entirety to the Company, unless:

              (1) in case the Company shall consolidate with or merge into
     another Person or convey, transfer or lease its properties and assets
     substantially as an entirety to any Person, the Person formed by such
     consolidation or into which the Company is merged or the Person which
     acquires by conveyance or transfer, or which leases, the properties and
     assets of the Company substantially as an entirety shall be a corporation,
     partnership, unincorporated organization, trust, or other entity 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 indenture supplemental hereto, executed and delivered to the
     Trustee, in form satisfactory to the Trustee, the due and punctual payment
     of the principal of and any premium and interest on all the Securities and
     the performance or observance of every covenant of this Indenture on the
     part of the Company to be performed or observed;

              (2) immediately after giving effect to such transaction and
     treating any indebtedness which becomes an obligation of the Company or any
     Subsidiary as a result of such transaction as having been incurred by the
     Company or such Subsidiary at the time of 

                                      49
<PAGE>
 
     such transaction, no Event of Default, and no event which, after notice or
     lapse of time or both, would become an Event of Default, shall have
     happened and be continuing;

              (3) if, as a result of any such consolidation or merger or such
     conveyance, transfer or lease, properties or assets of the Company would
     become subject to a mortgage, pledge, lien, security interest or other
     encumbrance which would not be permitted by this Indenture, the Company or
     such successor Person, as the case may be, shall take such steps as shall
     be necessary effectively to secure the Securities equally and ratably with
     (or prior to) all indebtedness secured thereby; and

              (4) the Company has delivered to the Trustee an Officers'
     Certificate and an Opinion of Counsel, each stating that such
     consolidation, merger, conveyance, transfer or lease and, if a supplemental
     indenture is required in connection with such transaction, such
     supplemental indenture comply with this Article and that all conditions
     precedent herein provided for relating to such transaction have been
     complied with.

Section 802.  Successor Substituted.

     Upon any consolidation of the Company with, or merger of the Company into,
any other Person or any conveyance, transfer or lease of the properties and
assets of the Company substantially as an entirety in accordance with Section
801, the successor Person formed by such consolidation or into which the Company
is merged or to which such conveyance, transfer or lease is made shall succeed
to, and be substituted for, and may exercise every right and power of, the
Company under this Indenture with the same effect as if such successor Person
had been named as the Company herein, and thereafter, except in the case of a
lease, the predecessor Person shall be relieved of all obligations and covenants
under this Indenture and the Securities.


                                  ARTICLE NINE

                            SUPPLEMENTAL INDENTURES

Section 901.  Supplemental Indentures Without Consent of Holders.

     Without the consent of any Holders, the Company, when authorized by a Board
Resolution, and the Trustee, at any time and from time to time, may enter into
one or more indentures supplemental hereto, in form satisfactory to the Trustee,
for any of the following purposes:

              (1) to evidence the succession of another Person to the Company
     and the assumption by any such successor of the covenants of the Company
     herein and in the Securities; or

              (2) to add to the covenants of the Company for the benefit of the
     Holders of all or any series of Securities (and if such covenants are to be
     for the benefit of less than all series of Securities, stating that such
     covenants are expressly being included solely for the 

                                      50
<PAGE>
 
     benefit of such series) or to surrender any right or power herein conferred
     upon the Company; or

              (3) to add any additional Events of Default for the benefit of the
     Holders of all or any series of Securities (and if such additional Events
     of Default are to be for the benefit of less than all series of Securities,
     stating that such additional Events of Default are expressly being included
     solely for the benefit of such series); or

              (4) to add to or change any of the provisions of this Indenture to
     such extent as shall be necessary to permit or facilitate the issuance of
     Securities in bearer form, registrable or not registrable as to principal,
     and with or without interest coupons, or to permit or facilitate the
     issuance of Securities in uncertificated form; or

              (5) to add to, change or eliminate any of the provisions of this
     Indenture in respect of one or more series of Securities, provided that any
     such addition, change or elimination (A) shall neither (i) apply to any
     Security of any series created prior to the execution of such supplemental
     indenture and entitled to the benefit of such provision nor (ii) modify the
     rights of the Holder of any such Security with respect to such provision or
     (B) shall become effective only when there is no such Security Outstanding;
     or

              (6)  to secure the Securities; or

              (7) to issue and establish the form or terms of Securities of any
     series as permitted by Sections 201 and 301; or

              (8) to evidence and provide for the acceptance of appointment
     hereunder by a successor Trustee with respect to the Securities of one or
     more series and to add to or change any of the provisions of this Indenture
     as shall be necessary to provide for or facilitate the administration of
     the trusts hereunder by more than one Trustee, pursuant to the requirements
     of Section 611; or

              (9) to cure any ambiguity, to correct or supplement any provision
     herein which may be defective or inconsistent with any other provision
     herein, or to make any other provisions with respect to matters or
     questions arising under this Indenture, provided that such action pursuant
     to this Clause (9) shall not adversely affect the interests of the Holders
     of Securities of any series in any material respect.

Section 902.  Supplemental Indentures With Consent of Holders.

     With the consent of the Holders of not less than a majority in principal
amount of the Outstanding Securities of each series affected by such
supplemental indenture, by Act of said Holders delivered to the Company and the
Trustee, the Company, when authorized by a Board Resolution, and the Trustee may
enter into an indenture or indentures supplemental hereto for the purpose of
adding any provisions to or changing in any manner or eliminating any of the
provisions of this Indenture or of modifying in any manner the rights of the
Holders of Securities of such series 

                                      51
<PAGE>
 
under this Indenture; provided, however, that no such supplemental indenture
shall, without the consent of the Holder of each Outstanding Security affected
thereby,

              (1) change the Stated Maturity of the principal of, or any
     instalment of principal of or interest on, any Security, or reduce the
     principal amount thereof or the rate of interest thereon or any premium
     payable upon the redemption thereof, or reduce the amount of the principal
     of an Original Issue Discount Security or any other Security which would be
     due and payable upon a declaration of acceleration of the Maturity thereof
     pursuant to Section 502, or change any Place of Payment where, or the coin
     or currency in which, any Security or any premium or interest thereon is
     payable, or impair the right to institute suit for the enforcement of any
     such payment on or after the Stated Maturity thereof (or, in the case of
     redemption, except as provided in any Conditional Notice given with respect
     thereto, on or after the Redemption Date), or

              (2) reduce the percentage in principal amount of the Outstanding
     Securities of any series, the consent of whose Holders is required for any
     such supplemental indenture, or the consent of whose Holders is required
     for any waiver (of compliance with certain provisions of this Indenture or
     certain defaults hereunder and their consequences) provided for in this
     Indenture, or

              (3) modify any of the provisions of this Section, Section 513 or
     Section 1008, except to increase any such percentage or to provide that
     certain other provisions of this Indenture cannot be modified or waived
     without the consent of the Holder of each Outstanding Security affected
     thereby; provided, however, that this clause shall not be deemed to require
     the consent of any Holder with respect to changes in the references to "the
     Trustee" and concomitant changes in this Section and Section 1008, or the
     deletion of this proviso, in accordance with the requirements of Sections
     611 and 901(8).

A supplemental indenture which changes or eliminates any covenant or other
provision of this Indenture which has expressly been included solely for the
benefit of one or more particular series of Securities, or which modifies the
rights of the Holders of Securities of such series with respect to such covenant
or other provision, shall be deemed not to affect the rights under this
Indenture of the Holders of Securities of any other series.

     It shall not be necessary for any Act of Holders under this Section to
approve the particular form of any proposed supplemental indenture, but it shall
be sufficient if such Act shall approve the substance thereof.

Section 903.  Execution of Supplemental Indentures.

     In executing, or accepting the additional trusts created by, any
supplemental indenture permitted by this Article or the modifications thereby of
the trusts created by this Indenture, the Trustee shall be entitled to receive,
and (subject to Section 601) shall be fully protected in relying upon, an
Opinion of Counsel stating that the execution of such supplemental indenture is
authorized or permitted by this Indenture. The Trustee may, but shall not be
obligated to, enter into any such 

                                      52
<PAGE>
 
supplemental indenture which affects the Trustee's own rights, duties or
immunities under this Indenture or otherwise.

Section 904.  Effect of Supplemental Indentures.

     Upon the execution of any supplemental indenture under this Article, this
Indenture shall be modified in accordance therewith, and such supplemental
indenture shall form a part of this Indenture for all purposes; and every Holder
of Securities theretofore or thereafter authenticated and delivered hereunder
shall be bound thereby.

Section 905.  Conformity with Trust Indenture Act.

     Every supplemental indenture executed pursuant to this Article shall
conform to the requirements of the Trust Indenture Act.

Section 906.  Reference in Securities to Supplemental Indentures.

     Securities of any series authenticated and delivered after the execution of
any supplemental indenture pursuant to this Article may, and shall if required
by the Trustee, bear a notation in form approved by the Trustee as to any matter
provided for in such supplemental indenture. If the Company shall so determine,
new Securities of any series so modified as to conform, in the opinion of the
Trustee and the Company, to any such supplemental indenture may be prepared and
executed by the Company and authenticated and delivered by the Trustee in
exchange for Outstanding Securities of such series.


                                  ARTICLE TEN

                                   COVENANTS

Section 1001. Payment of Principal, Premium and Interest.

     The Company covenants and agrees for the benefit of each series of
Securities that it will duly and punctually pay the principal of and any premium
and interest on the Securities of that series in accordance with the terms of
the Securities and this Indenture.

                                      53
<PAGE>
 
Section 1002. Maintenance of Office or Agency.

     The Company will maintain in each Place of Payment for any series of
Securities an office or agency where Securities of that series may be presented
or surrendered for payment, where Securities of that series may be surrendered
for registration of transfer or exchange and where notices and demands to or
upon the Company in respect of the Securities of that series and this Indenture
may be served. The Company will give prompt written notice to the Trustee of the
location, and any change in the location, of such office or agency. If at any
time the Company shall fail to maintain any such required office or agency or
shall fail to furnish the Trustee with the address thereof, such presentations,
surrenders, notices and demands may be made or served at the Corporate Trust
Office of the Trustee, and the Company hereby appoints the Trustee as its agent
to receive all such presentations, surrenders, notices and demands.

     The Company may also from time to time designate one or more other offices
or agencies where the Securities of one or more series may be presented or
surrendered for any or all such purposes and may from time to time rescind such
designations; provided, however, that no such designation or rescission shall in
any manner relieve the Company of its obligation to maintain an office or agency
in each Place of Payment for Securities of any series for such purposes. The
Company will give prompt written notice to the Trustee of any such designation
or rescission and of any change in the location of any such other office or
agency.

Section 1003. Money for Securities Payments to Be Held in Trust.

     If the Company shall at any time act as its own Paying Agent with respect
to any series of Securities, it will, on or before each due date of the
principal of or any premium or interest on any of the Securities of that series,
segregate and hold in trust for the benefit of the Persons entitled thereto a
sum sufficient to pay the principal and any premium and interest so becoming due
until such sums shall be paid to such Persons or otherwise disposed of as herein
provided and will promptly notify the Trustee of its action or failure so to
act.

     Whenever the Company shall have one or more Paying Agents for any series of
Securities, it will, prior to each due date of the principal of or any premium
or interest on any Securities of that series, deposit with a Paying Agent a sum
sufficient to pay such amount, such sum to be held as provided by the Trust
Indenture Act, and (unless such Paying Agent is the Trustee) the Company will
promptly notify the Trustee of its action or failure so to act.

     The Company will cause each Paying Agent for any series of Securities other
than the Trustee to execute and deliver to the Trustee an instrument in which
such Paying Agent shall agree with the Trustee, subject to the provisions of
this Section, that such Paying Agent will (1) comply with the provisions of the
Trust Indenture Act applicable to it as a Paying Agent and (2) during the
continuance of any default by the Company (or any other obligor upon the
Securities of that series) in the making of any payment in respect of the
Securities of that series, upon the written request of the Trustee, forthwith
pay to the Trustee all sums held in trust by such Paying Agent for payment in
respect of the Securities of that series.

                                      54
<PAGE>
 
     The Company may at any time, for the purpose of obtaining the satisfaction
and discharge of this Indenture or for any other purpose, pay, or by Company
Order direct any Paying Agent to pay, to the Trustee all sums held in trust by
the Company or such Paying Agent, such sums to be held by the Trustee upon the
same trusts as those upon which such sums were held by the Company or such
Paying Agent; and, upon such payment by any Paying Agent to the Trustee, such
Paying Agent shall be released from all further liability with respect to such
money.

     Any money deposited with the Trustee or any Paying Agent, or then held by
the Company, in trust for the payment of the principal of or any premium or
interest on any Security of any series and remaining unclaimed for two years
after such principal, premium or interest has become due and payable shall be
paid to the Company on Company Request, or (if then held by the Company) shall
be discharged from such trust; and the Holder of such Security shall thereafter,
as an unsecured general creditor, look only to the Company for payment thereof,
and all liability of the Trustee or such Paying Agent with respect to such trust
money, and all liability of the Company as trustee thereof, shall thereupon
cease; provided, however, that the Trustee or such Paying Agent, before being
required to make any such repayment, may at the expense of the Company cause to
be published once, in a newspaper published in the English language, customarily
published on each business day and of general circulation in the Borough of
Manhattan, The City of New York, New York, notice that such money remains
unclaimed and that, after a date specified therein, which shall not be less than
30 days from the date of such publication, any unclaimed balance of such money
then remaining will be repaid to the Company and the Holder of the Security
entitled to receive such payment shall thereafter only look to the Company for
the payment thereof.

Section 1004. Statement by Officers as to Default.

     The Company will deliver to the Trustee, within 120 days after the end of
each fiscal year of the Company ending after the date hereof, an Officers'
Certificate, stating whether or not to the best knowledge of the signers thereof
after due inquiry the Company is in default in the performance and observance of
any of the terms, provisions and conditions of this Indenture (without regard to
any period of grace or requirement of notice provided hereunder) and, if the
Company shall be in default, specifying all such defaults and the nature and
status thereof of which they may have knowledge.

Section 1005. Existence.

     Subject to Article Eight, the Company 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 the
Company shall not be required to preserve any such right or franchise if the
Board of Directors shall determine that the preservation thereof is no longer
desirable in the conduct of the business of the Company and that the loss
thereof is not disadvantageous in any material respect to the Holders.

                                      55
<PAGE>
 
Section 1006. Maintenance of Properties.

     The Company will cause all properties used or useful in the conduct of its
business to be maintained and kept in good condition, repair and working order
and supplied with all necessary equipment and will cause to be made all
necessary repairs, renewals replacements, betterments and improvements thereof,
all as in the judgment of the Company may be necessary so that the business
carried on in connection therewith may be properly and advantageously conducted
at all times; provided, however, that nothing in this Section shall prevent the
Company from discontinuing the operation or maintenance of any of such
properties if such discontinuance is, in the judgment of the Company, desirable
in the conduct of its business and not disadvantageous in any material respect
to the Holders.

Section 1007. Payment of Taxes and Other Claims.

     The Company will pay or discharge or cause to be paid or discharged, before
the same shall become delinquent, (1) all taxes, assessments and governmental
charges levied or imposed upon the Company or upon the income, profits or
property of the Company, and (2) all lawful claims for labor, materials and
supplies which, if unpaid, might by law become a lien upon the property of the
Company; provided, however, that the Company shall not be required to pay or
discharge or cause to be paid or discharged any such tax, assessment, charge or
claim (i) whose amount, applicability or validity is being contested in good
faith by appropriate proceedings or (ii) if the failure to pay such tax,
assessment, charge or claim is not likely to have a material adverse effect on
the financial condition of the Company and its consolidated Subsidiaries, taken
as a whole.

Section 1008. Waiver of Certain Covenants.

     Except as otherwise specified as contemplated by Section 301 for Securities
of such series, the Company may, with respect to the Securities of any series,
omit in any particular instance to comply with any term, provision or condition
set forth in any covenant provided pursuant to Section 301(19), 901(2) or 901(7)
for the benefit of the Holders of such series or in any of Sections 1006 through
1007 if before the time for such compliance the Holders of at least a majority
in principal amount of the Outstanding Securities of such series shall, by Act
of such Holders, either waive such compliance in such instance or generally
waive compliance with such term, provision or condition, but no such waiver
shall extend to or affect such term, provision or condition except to the extent
so expressly waived, and, until such waiver shall become effective, the
obligations of the Company and the duties of the Trustee in respect of any such
term, provision or condition shall remain in full force and effect.

Section 1009. Calculation of Original Issue Discount.

     The Company shall file with the Trustee promptly at the end of each
calendar year a written notice specifying the amount of original issue discount
(including daily rates and accrual periods) accrued on Outstanding Securities as
of the end of such year.

                                      56
<PAGE>
 
                                 ARTICLE ELEVEN

                            REDEMPTION OF SECURITIES

Section 1101. Applicability of Article.

     Securities of any series which are redeemable before their Stated Maturity
shall be redeemable in accordance with their terms and (except as otherwise
specified as contemplated by Section 301 for such Securities) in accordance with
this Article.

Section 1102. Election to Redeem; Notice to Trustee.

     The election of the Company to redeem any Securities shall be evidenced by
a Board Resolution or in another manner specified as contemplated by Section 301
for such Securities. In case of any redemption at the election of the Company
the Company shall, at least 45 days prior to the Redemption Date fixed by the
Company (unless a shorter notice shall be satisfactory to the Trustee), notify
the Trustee of such Redemption Date, of the principal amount of Securities of
such series to be redeemed and, if applicable, of the tenor of the Securities to
be redeemed. In the case of any redemption of Securities (a) prior to the
expiration of any restriction on such redemption provided in the terms of such
Securities or elsewhere in this Indenture, or (b) pursuant to an election of the
Company which is subject to a condition specified in the terms of such
Securities or elsewhere in this Indenture, the Company shall furnish the Trustee
with an Officers' Certificate and Opinion of Counsel evidencing compliance with
such restriction.

Section 1103. Selection by Trustee of Securities to Be Redeemed.

     If less than all the Securities of any series are to be redeemed (unless
all the Securities of such series and of a specified tenor are to be redeemed or
unless such redemption affects only a single Security), the particular
Securities to be redeemed shall be selected at least 30 but not more than 60
days prior to the Redemption Date by the Trustee, from the Outstanding
Securities of such series not previously called for redemption, (i) on a pro
rata basis, or (ii) by lot.  If less than all the Securities of such series and
of a specified tenor are to be redeemed (unless such redemption affects only a
single Security), the particular Securities to be redeemed shall be selected at
least 30 but not more than 60 days prior to the Redemption Date by the Trustee,
from the Outstanding Securities of such series and specified tenor not
previously called for redemption in accordance with the preceding sentence.

     The Trustee shall promptly notify the Company in writing of the Securities
selected for redemption as aforesaid and, in case of any Securities selected for
partial redemption as aforesaid, the principal amount thereof to be redeemed.

     The provisions of the two preceding paragraphs shall not apply with respect
to any redemption affecting only a single Security, whether such Security is to
be redeemed in whole or in 

                                      57

<PAGE>
 
part. In the case of any such redemption in part, the unredeemed portion of the
principal amount of the Security shall be in an authorized denomination (which
shall not be less than the minimum authorized denomination) for such Security.

     For all purposes of this Indenture, unless the context otherwise requires,
all provisions relating to the redemption of Securities shall relate, in the
case of any Securities redeemed or to be redeemed only in part, to the portion
of the principal amount of such Securities which has been or is to be redeemed.

Section 1104. Notice of Redemption.

     Notice of redemption shall be given by first-class mail, postage prepaid,
mailed not less than 30 nor more than 60 days prior to the Redemption Date, to
each Holder of Securities to be redeemed, at his address appearing in the
Security Register.

     All notices of redemption shall identify the Securities to be redeemed
(including CUSIP number) and shall state:

              (1)  the Redemption Date,

              (2)  the Redemption Price,
  
              (3) if less than all the Outstanding Securities of any series and
     of a specified tenor consisting of more than a single Security are to be
     redeemed, the identification (and, in the case of partial redemption of any
     such Securities, the principal amounts) of the particular Securities to be
     redeemed and, if less than all the Outstanding Securities of any series and
     of a specified tenor consisting of a single Security are to be redeemed,
     the principal amount of the particular Security to be redeemed,

              (4) that on the Redemption Date, except as otherwise provided in
     any Conditional Notice (as defined below), the Redemption Price will become
     due and payable upon each such Security to be redeemed and, if applicable,
     that interest thereon will cease to accrue on and after said date,

              (5) the place or places where each such Security is to be
     surrendered for payment of the Redemption Price, and

              (6) that the redemption is for a sinking fund, if such is the
     case.

     Notice of redemption of Securities to be redeemed at the election of the
Company shall be given by the Company or, at the Company's request, by the
Trustee in the name and at the expense of the Company and shall be irrevocable.

     Each notice of redemption (except with respect to any mandatory sinking
fund payment, as defined in Section 1201) may include a statement that such
redemption shall be conditional upon the 

                                      58
<PAGE>
 
receipt by the Trustee on or prior to the Redemption Date of amounts sufficient
to pay principal of, and premium, if any, and interest on, the Securities to be
redeemed, and that if such amounts shall not have been so received, said notice
shall be of no force and effect, the Securities to be redeemed will not become
due and payable, and the Company shall not be required to redeem such Securities
(a "Conditional Notice"). In the event that a Conditional Notice is given and
sufficient amounts as referred to in the Conditional Notice are not so received,
the redemption shall not be made and the Trustee shall, within a reasonable time
thereafter, give notice, to the persons and in the manner in which the notice of
redemption was given, that such amounts were not received and the redemption was
not effected.

Section 1105. Deposit of Redemption Price.

     Prior to any Redemption Date, the Company shall deposit with the Trustee or
with a Paying Agent (or, if the Company is acting as its own Paying Agent,
segregate and hold in trust as provided in Section 1003) an amount of money
sufficient to pay the Redemption Price of, and (except if the Redemption Date
shall be an Interest Payment Date) accrued interest on, all the Securities which
are to be redeemed on that date.

Section 1106. Securities Payable on Redemption Date.

     Notice of redemption having been given as aforesaid, and, in the event that
a Conditional Notice was given, money for the payment of the Redemption Price
having been deposited as provided in Section 1105, the Securities so to be
redeemed shall, on the Redemption Date, become due and payable at the Redemption
Price therein specified, and from and after such date (unless the Company shall
default in the payment of the Redemption Price and accrued interest) such
Securities shall cease to bear interest and the holders thereof will have no
rights in respect to the Securities so to be redeemed except to receive payment
of the Redemption Price thereof, without interest accrued on any funds held
after the Redemption Date to pay such Redemption Price. Upon surrender of any
such Security for redemption in accordance with said notice, such Security shall
be paid by the Company at the Redemption Price, together with accrued interest
to the Redemption Date; provided, however, that, unless otherwise specified as
contemplated by Section 301, installments of interest whose Stated Maturity is
on or prior to the Redemption Date will be payable to the Holders of such
Securities, or one or more Predecessor Securities, registered as such at the
close of business on the relevant Record Dates according to their terms and the
provisions of Section 307.

     If any Security called for redemption shall not be so paid upon surrender
thereof for redemption, the principal and any premium shall, until paid, bear
interest from the Redemption Date at the rate prescribed therefor in the
Security.

Section 1107. Securities Redeemed in Part.

     Any Security which is to be redeemed only in part shall be surrendered at a
Place of Payment therefor (with, if the Company or the Trustee so requires, due
endorsement by, or a written instrument of transfer in form satisfactory to the
Company and the Trustee duly executed by, the Holder thereof or his attorney
duly authorized in writing), and the Company shall execute, and the 

                                      59
<PAGE>
 
Trustee shall authenticate and deliver to the Holder of such Security without
service charge, a new Security or Securities of the same series and of like
tenor, of any authorized denomination as requested by such Holder, in aggregate
principal amount equal to and in exchange for the unredeemed portion of the
principal of the Security so surrendered.


                                 ARTICLE TWELVE

                                 SINKING FUNDS

Section 1201. Applicability of Article.

     The provisions of this Article shall be applicable to any sinking fund for
the retirement of Securities of any series except as otherwise specified as
contemplated by Section 301 for such Securities.

     The minimum amount of any sinking fund payment provided for by the terms of
any Securities is herein referred to as a "mandatory sinking fund payment", and
any payment in excess of such minimum amount provided for by the terms of such
Securities is herein referred to as an "optional sinking fund payment". If
provided for by the terms of any Securities, the cash amount of any sinking fund
payment may be subject to reduction as provided in Section 1202. Each sinking
fund payment shall be applied to the redemption of Securities as provided for by
the terms of such Securities.

Section 1202. Satisfaction of Sinking Fund Payments with Securities.

     The Company (1) may deliver Outstanding Securities of a series (other than
any previously called for redemption) and (2) may apply as a credit Securities
of a series which have been redeemed either at the election of the Company
pursuant to the terms of such Securities or through the application of permitted
optional sinking fund payments pursuant to the terms of such Securities, in each
case in satisfaction of all or any part of any sinking fund payment with respect
to any Securities of such series required to be made pursuant to the terms of
such Securities as and to the extent provided for by the terms of such
Securities; provided that the Securities to be so credited have not been
previously so credited. The Securities to be so credited shall be received and
credited for such purpose by the Trustee at the Redemption Price, as specified
in the Securities so to be redeemed, for redemption through operation of the
sinking fund and the amount of such sinking fund payment shall be reduced
accordingly.

Section 1203. Redemption of Securities for Sinking Fund.

     Not less than 60 days prior to each sinking fund payment date for any
Securities, the Company will deliver to the Trustee an Officers' Certificate
specifying the amount of the next ensuing sinking fund payment for such
Securities pursuant to the terms of such Securities, the portion thereof, if
any, which is to be satisfied by payment of cash and the portion thereof, if
any, which is to be satisfied by delivering and crediting Securities pursuant to
Section 1202 and stating 

                                      60
<PAGE>
 
the basis for such credit and that such Securities have not been previously so
credited and will also deliver to the Trustee any Securities to be so delivered.
Not less than 30 days prior to each such sinking fund payment date, the Trustee
shall select the Securities to be redeemed upon such sinking fund payment date
in the manner specified in Section 1103 and cause notice of the redemption
thereof to be given in the name of and at the expense of the Company in the
manner provided in Section 1104. Such notice having been duly given, the
redemption of such Securities shall be made upon the terms and in the manner
stated in Sections 1106 and 1107.


                                ARTICLE THIRTEEN

                       DEFEASANCE AND COVENANT DEFEASANCE

Section 1301. Company's Option to Effect Defeasance or Covenant Defeasance.

     The Company may elect, at its option at any time, to have Section 1302 or
Section 1303 applied to any Securities or any series of Securities, as the case
may be, designated pursuant to Section 301 as being defeasible pursuant to such
Section 1302 or 1303, in accordance with any applicable requirements provided
pursuant to Section 301 and upon compliance with the conditions set forth below
in this Article. Any such election shall be evidenced by a Board Resolution or
in another manner specified as contemplated by Section 301 for such Securities.

Section 1302. Defeasance and Discharge.

     Upon the Company's exercise of its option (if any) to have this Section
applied to any Securities or any series of Securities, as the case may be, the
Company shall be deemed to have been discharged from its obligations, and the
provisions of Article Fourteen shall cease to be effective, with respect to such
Securities as provided in this Section on and after the date the conditions set
forth in Section 1304 are satisfied (hereinafter called "Defeasance"). For this
purpose, such Defeasance means that the Company shall be deemed to have paid and
discharged the entire indebtedness represented by such Securities and to have
satisfied all its other obligations under such Securities and this Indenture
insofar as such Securities are concerned (and the Trustee, at the expense of the
Company, shall execute proper instruments acknowledging the same), subject to
the following which shall survive until otherwise terminated or discharged
hereunder: (1) the rights of Holders of such Securities to receive, solely from
the trust fund described in Section 1304 and as more fully set forth in such
Section, payments in respect of the principal of and any premium and interest on
such Securities when payments are due, (2) the Company's obligations with
respect to such Securities under Sections 304, 305, 306, 1002 and 1003 and with
respect to the Trustee under Section 607, (3) the rights, powers, trusts, duties
and immunities of the Trustee hereunder and (4) this Article. Subject to
compliance with this Article, the Company may exercise its option (if any) to
have this Section applied to any Securities notwithstanding the prior exercise
of its option (if any) to have Section 1303 applied to such Securities.

                                      61
<PAGE>
 
Section 1303. Covenant Defeasance.

     Upon the Company's exercise of its option (if any) to have this Section
applied to any Securities or any series of Securities, as the case may be, (1)
the Company shall be released from its obligations under Section 801(3),
Sections 1006 through 1007, inclusive, and any covenants provided pursuant to
Section 301(19), 901(2), 901(6) or 901(7) for the benefit of the Holders of such
Securities and (2) the occurrence of any event specified in Sections 501(4)
(with respect to any of Section 801(3), Sections 1006 through 1007, inclusive,
and any such covenants provided pursuant to Section 301(19), 901(2), 901(6) or
901(7)), and 501(7) shall be deemed not to be or result in an Event of Default
and the provisions of Article Fourteen shall cease to be effective, in each case
with respect to such Securities as provided in this Section on and after the
date the conditions set forth in Section 1304 are satisfied (hereinafter called
"Covenant Defeasance"). For this purpose, such Covenant Defeasance means that,
with respect to such Securities, the Company may omit to comply with and shall
have no liability in respect of any term, condition or limitation set forth in
any such specified Section (to the extent so specified in the case of Section
501(4)) or Article Fourteen, whether directly or indirectly by reason of any
reference elsewhere herein to any such Section or Article or by reason of any
reference in any such Section or Article to any other provision herein or in any
other document, but the remainder of this Indenture and such Securities shall be
unaffected thereby.

Section 1304. Conditions to Defeasance or Covenant Defeasance.

     The following shall be the conditions to the application of Section 1302 or
Section 1303 to any Securities or any series of Securities, as the case may be:

              (1) The Company shall irrevocably have deposited or caused to be
     deposited with the Trustee as trust funds in trust for the purpose of
     making the following payments, specifically pledged as security for, and
     dedicated solely to, the benefit of the Holders of such Securities, (A)
     money in an amount, or (B) U.S. Government Obligations which through the
     scheduled payment of principal and interest in respect thereof in
     accordance with their terms will provide, not later than one day before the
     due date of any payment, money in an amount, or (C) a combination thereof,
     in each case sufficient, in the opinion of a nationally recognized firm of
     independent public accountants expressed in a written certification thereof
     delivered to the Trustee, to pay and discharge, and which shall be applied
     by the Trustee to pay and discharge, the principal of and any premium and
     interest on such Securities on the respective Stated Maturities or on any
     Redemption Date established pursuant to clause (9) below, in accordance
     with the terms of this Indenture and such Securities. As used herein, "U.S.
     Government Obligation" means (x) any security which is (i) a direct
     obligation of the United States of America for the payment of which the
     full faith and credit of the United States of America is pledged or (ii) an
     obligation of a Person controlled or supervised by and acting as an agency
     or instrumentality of the United States of America the payment of which is
     unconditionally guaranteed as a full faith and credit obligation by the
     United States of America, which, in either case (i) or (ii), is not
     callable or redeemable at the option of the issuer thereof, and (y) any
     depositary receipt issued by a bank (as defined in Section 3(a)(2) of the
     Securities Act) as custodian with respect to any U.S. Government Obligation
     which is specified in Clause (x) above and held by such bank for the
     account of the holder of such depositary receipt, or with respect to any
     specific payment of 

                                      62
<PAGE>
 
     principal of or interest on any U.S. Government Obligation which is so
     specified and held, provided that (except as required by law) such
     custodian is not authorized to make any deduction from the amount payable
     to the holder of such depositary receipt from any amount received by the
     custodian in respect of the U.S. Government Obligation or the specific
     payment of principal or interest evidenced by such depositary receipt.

          (2) In the event of an election to have Section 1302 apply to any
     Securities or any series of Securities, as the case may be, the Company
     shall have delivered to the Trustee an Opinion of Counsel stating that (A)
     the Company has received from, or there has been published by, the Internal
     Revenue Service a ruling or (B) since the date of this instrument, there
     has been a change in the applicable Federal income tax law, in either case
     (A) or (B) to the effect that, and based thereon such opinion shall confirm
     that, the Holders of such Securities will not recognize gain or loss for
     Federal income tax purposes as a result of the deposit, Defeasance and
     discharge to be effected with respect to such Securities and will be
     subject to Federal income tax on the same amount, in the same manner and at
     the same times as would be the case if such deposit, Defeasance and
     discharge were not to occur.

          (3) In the event of an election to have Section 1303 apply to any
     Securities or any series of Securities, as the case may be, the Company
     shall have delivered to the Trustee an Opinion of Counsel to the effect
     that the Holders of such Securities will not recognize gain or loss for
     Federal income tax purposes as a result of the deposit and Covenant
     Defeasance to be effected with respect to such Securities and will be
     subject to Federal income tax on the same amount, in the same manner and at
     the same times as would be the case if such deposit and Covenant Defeasance
     were not to occur.

          (4) The Company shall have delivered to the Trustee an Officers'
     Certificate to the effect that neither such Securities nor any other
     Securities of the same series, if then listed on any securities exchange,
     will be delisted as a result of such deposit.

          (5) No event which is, or after notice or lapse of time or both would
     become, an Event of Default with respect to such Securities or any other
     Securities shall have occurred and be continuing at the time of such
     deposit or, with regard to any such event specified in Sections 501(5) and
     (6), at any time on or prior to the 90th day after the date of such deposit
     (it being understood that this condition shall not be deemed satisfied
     until after such 90th day).

          (6) Such Defeasance or Covenant Defeasance shall not cause the Trustee
     to have a conflicting interest within the meaning of the Trust Indenture
     Act (assuming all Securities are in default within the meaning of such
     Act).

          (7) Such Defeasance or Covenant Defeasance shall not result in a
     breach or violation of, or constitute a default under, any other agreement
     or instrument to which the Company is a party or by which it is bound.

                                      63
<PAGE>
 
              (8)  Such Defeasance or Covenant Defeasance shall not result in
     the trust arising from such deposit constituting an investment company
     within the meaning of the Investment Company Act unless such trust shall be
     registered under such Act or exempt from registration thereunder.

              (9)  If the Securities are to be redeemed prior to Stated Maturity
     (other than from mandatory sinking fund payments or analogous payments),
     notice of such redemption shall have been duly given pursuant to this
     Indenture or provision therefor satisfactory to the Trustee shall have been
     made.

              (10) At the time of such deposit, (A) no default in the payment of
     any principal of or premium or interest on any Senior Debt shall have
     occurred and be continuing, (B) no event of default with respect to any
     Senior Debt shall have resulted in such Senior Debt becoming, and
     continuing to be, due and payable prior to the date on which it would
     otherwise have become due and payable (unless payment of such Senior Debt
     has been made or duly provided for), and (C) no other event of default with
     respect to any Senior Debt shall have occurred and be continuing permitting
     (after notice or lapse of time or both) the holders of such Senior Debt (or
     a trustee on behalf of such holders) to declare such Senior Debt due and
     payable prior to the date on which it would otherwise have become due and
     payable.

              (11) The Company shall have delivered to the Trustee an Officers'
     Certificate and an Opinion of Counsel, each stating that all conditions
     precedent with respect to such Defeasance or Covenant Defeasance have been
     complied with.

Section 1305. Deposited Money and U.S. Government Obligations to Be Held in
              Trust; Miscellaneous Provisions.

     Subject to the provisions of the last paragraph of Section 1003, all money
and U.S. Government Obligations (including the proceeds thereof) deposited with
the Trustee pursuant to Section 1304 in respect of any Securities shall be held
in trust and applied by the Trustee, in accordance with the provisions of such
Securities and this Indenture, to the payment, either directly or through any
such Paying Agent (including the Company acting as its own Paying Agent) as the
Trustee may determine, to the Holders of such Securities, of all sums due and to
become due thereon in respect of principal and any premium and interest, but
money so held in trust need not be segregated from other funds except to the
extent required by law.

     Money and U.S. Government Obligations so held in trust shall not be subject
to the provisions of Article Fourteen.

     The Company shall pay and indemnify the Trustee against any tax, fee or
other charge imposed on or assessed against the U.S. Government Obligations
deposited pursuant to Section 1304 or the principal and interest received in
respect thereof other than any such tax, fee or other charge which by law is for
the account of the Holders of Outstanding Securities.

                                      64
<PAGE>
 
     Anything in this Article to the contrary notwithstanding, the Trustee shall
deliver or pay to the Company from time to time upon Company Request any money
or U.S. Government Obligations held by it as provided in Section 1304 with
respect to any Securities which, in the opinion of a nationally recognized firm
of independent public accountants expressed in a written certification thereof
delivered to the Trustee, are in excess of the amount thereof which would then
be required to be deposited to effect the Defeasance or Covenant Defeasance, as
the case may be, with respect to such Securities.

Section 1306. Reinstatement.

     If the Trustee or the Paying Agent is unable to apply any money in
accordance with this Article with respect to any Securities by reason of any
order or judgment of any court or governmental authority enjoining, restraining
or otherwise prohibiting such application, then the obligations under this
Indenture and such Securities from which the Company has been discharged or
released pursuant to Section 1302 or 1303 shall be revived and reinstated as
though no deposit had occurred pursuant to this Article with respect to such
Securities, until such time as the Trustee or Paying Agent is permitted to apply
all money held in trust pursuant to Section 1305 with respect to such Securities
in accordance with this Article; provided, however, that at any such time or
during the continuance of any such event, the Company may request the return of
all money or securities deposited hereunder with respect to such Securities and
the Trustee will return to the Company all such money and securities.


                                ARTICLE FOURTEEN

                          SUBORDINATION OF SECURITIES

Section 1401. Securities Subordinate to Senior Indebtedness.

     Unless otherwise provided in a supplemental indenture or pursuant to
Section 301, the Company covenants and agrees, and each Holder of Securities
issued hereunder by his acceptance thereof likewise covenants and agrees, that
all Securities shall be issued subject to the provisions of this Article
Fourteen; and each Holder of a Security, whether upon original issue or upon
transfer or assignment thereof, accepts and agrees to be bound by such
provisions.

     The payment of all Obligations on all Securities issued hereunder shall, to
the extent and in the manner hereinafter set forth, be subordinate and junior in
right of payment to the prior payment in full of all Obligations on Senior
Indebtedness, whether outstanding at the date of this Indenture or thereafter
incurred.

     No provision of this Article Fourteen shall prevent the occurrence of any
default or Event of Default hereunder.

                                      65
<PAGE>
 
Section 1402. Suspension of Payment When Senior Indebtedness in Default.

     (1)      If any default occurs and is continuing in the payment when due,
whether at maturity, upon any redemption, by acceleration or otherwise, of any
principal, premium or interest on any Senior Indebtedness, no payment of any
kind or character shall be made by or on behalf of the Company or any other
Person on its behalf with respect to any Obligations on the Securities or to
acquire any of the Securities for cash or property or otherwise.

     (2)      In addition, if any other event of default occurs and is
continuing with respect to any Senior Indebtedness, other than Designated Senior
Indebtedness, as such event of default is defined in the instrument creating or
evidencing such Senior Indebtedness, permitting the holders of such Senior
Indebtedness then outstanding to immediately accelerate the maturity thereof and
if a representative for such issue of Senior Indebtedness gives written notice
of the event of default to the Trustee (a "Default Notice"), then unless and
until all events of default with respect to such Senior Indebtedness have been
cured, or waived in writing or have ceased to exist or the Trustee receives
notice from such representative for the respective issue of Senior Indebtedness
terminating the Blockage Period (as defined below), during the 179 days after
the delivery of such Default Notice (the "Blockage Period"), neither the Company
nor any other Person on its behalf shall (x) make any payment of any kind or
character with respect to any Obligations on the Securities or (y) acquire any
of the Securities for cash or property or otherwise. Notwithstanding anything
herein to the contrary, in no event will a Blockage Period extend beyond 179
days from the date the payment on the Securities was due and only one such
Blockage Period may be commenced within any 365 consecutive days, irrespective
of the number of defaults with respect to Senior Indebtedness during such
period. In no event may the total number of days during which any Blockage
Period is or Blockage Periods are in effect exceed 179 days in the aggregate
during any consecutive 365 day period. No event of default which existed or was
continuing on the date of the commencement of any Blockage Period with respect
to the Senior Indebtedness shall be, or be made, the basis for commencement of a
second Blockage Period by a representative of such Senior Indebtedness unless
such event of default shall have been cured or waived for a period of not less
than 90 consecutive days (it being acknowledged that any subsequent action, or
any breach of any financial covenants for a period commencing after the date of
commencement of such Blockage Period that, in either case, would give rise to an
event of default pursuant to any provisions under which an event of default
previously existed or was continuing shall constitute a new event of default for
this purpose.)

     (3)      In addition, if any event of default (as defined in the instrument
creating or evidencing any Designated Senior Indebtedness) occurs and is
continuing with respect to any Designated Senior Indebtedness or an executive
officer of the Company has actual knowledge of a default under any Designated
Senior Indebtedness, which with notice or lapse of time or both would result in
an event of default under such Designated Senior Indebtedness, then the Company
shall give notice thereof to the Trustee and, regardless of the giving of such
notice, no payment of any kind or character shall be made by or on behalf of the
Company or any other Person on its behalf with respect to any Obligations on the
Securities or to acquire any of the Securities for cash or property or otherwise
for a period of 179 days from the date of each such event of default on the date
that an executive officer obtains actual knowledge that there is such a default
(a "Designated Senior Indebtedness Blockage Period"), unless and until all such
events of defaults or defaults with respect to such Designated Senior
Indebtedness have been cured or waived in writing pursuant to the Designated
Senior Indebtedness or have ceased to exist or the Trustee receives notice from
a 

                                      66
<PAGE>
 
representative for the applicable issue of Designated Senior Indebtedness
terminating the Designated Senior Indebtedness Blockage Period. Immediately upon
receipt of a notice of default from a representative of any Designated Senior
Indebtedness by the Company, the Company shall give written notice thereof to
the Trustee, but the failure of the Company to give such notice shall not affect
the rights of the Designated Senior Indebtedness hereunder.

     (4)      The Company further agrees, for the benefit of the holders of
Designated Senior Indebtedness, that in the event any Security is declared due
and payable under Section 502 hereof before its expressed maturity, (i) the
Company will give prompt notice in writing of such happening to the holders of
Designated Senior Indebtedness and (ii) no payment of any kind or character
shall be made by or on behalf of the Company or any other Person on its behalf
with respect to any Obligations on the Securities or to acquire any of the
Securities for cash or property or otherwise without the consent of the
Designated Senior Indebtedness.

Section 1403. Payment Over of Proceeds Upon Dissolution, Etc.

     (1)      Upon any payment by the Company, or distribution of assets of the
Company of any kind or character, whether in cash, property or securities, to
creditors upon any liquidation, dissolution, winding-up, assignment for the
benefit of creditors or marshaling of assets of the Company or in bankruptcy,
reorganization, insolvency, receivership or other similar proceeding relating to
the Company or its property, whether voluntary or involuntary, all Obligations
due or to become due upon all Senior Indebtedness shall first be paid in full,
or payment thereof duly provided for to the satisfaction of holders of Senior
Indebtedness, before any payment or distribution of any kind or character is
made on account of any Obligations on the Securities, or for the acquisition of
any of the Securities for cash, or property, or otherwise. Upon any such
dissolution, winding-up, liquidation, reorganization, receivership or similar
proceeding, any payment by the Company, or distribution of assets of the Company
of any kind or character, whether in cash, property or securities, to which the
Holders of the Securities or the Trustee for the benefit of such Holders would
be entitled, except for the provisions of this Article Fourteen, shall be paid
by the Company or by any receiver, trustee in bankruptcy, liquidating trustee,
agent or other person making such payment or distribution, or by the Holders of
the Securities or by the Trustee under this Indenture if received by them or it,
directly to the holders of Senior Indebtedness (pro rata to such holders on the
basis of the respective amounts of Senior Indebtedness held by such holders) or
their representative or representatives, or to the trustee or trustees under any
indenture pursuant to which any instruments evidencing any Senior Indebtedness
may have been issued, as their respective interests may appear to the extent
necessary to pay all Senior Indebtedness in full, in money or money's worth,
after giving effect to any concurrent payment or distribution or provision
therefor to or for the holders of Senior Indebtedness, before any payment or
distribution is made to the Holders of Securities or to the Trustee for the
benefit of such Holders.

     (2)      To the extent any payment of Senior Indebtedness (whether by or on
behalf of the Company, as proceeds of security or enforcement of any right of
set off or otherwise) is declared to be fraudulent or preferential, set aside or
required to be paid to any receiver, trustee in bankruptcy, liquidating trustee,
agent or other similar Person under any bankruptcy, insolvency, receivership,
fraudulent conveyance or similar law, then, if such payment is recovered by, or
paid over to, such 

                                      67
<PAGE>
 
receiver, trustee in bankruptcy, liquidating trustee, agent or other similar
Person, the Senior Indebtedness or part thereof originally intended to be
satisfied shall be deemed to be reinstated and outstanding as if such payment
had not occurred.

     For purposes of this Article Fourteen, the words, "cash, property or
securities" shall not be deemed to include shares of stock of the Company as
reorganized or readjusted, or securities of the Company or any other corporation
provided for by a plan of reorganization or readjustment, the payment of which
is subordinated at least to the extent provided in this Article Fourteen with
respect to the Securities to the payment of all Senior Indebtedness which may at
the time be outstanding; provided that (i) the Senior Indebtedness is assumed by
the new corporation, if any, resulting from any such reorganization or
readjustment, and (ii) the rights of the holders of the Senior Indebtedness are
not, without the consent pursuant to such Senior Indebtedness, altered by such
reorganization or readjustment. The consolidation of the Company with, or the
merger of the Company into, another corporation or the liquidation or
dissolution of the Company following the conveyance, transfer or lease of its
property as an entirety, or substantially as an entirety, to another corporation
upon the terms and conditions provided for in Article Eight hereof shall not be
deemed a dissolution, winding-up, or liquidation for the proposes of this
Section 1403 if such other corporation shall, as a part of such consolidation,
merger, conveyance or transfer, comply with the conditions stated in Article
Eight hereof.

Section 1404. Monies Held in Trust.

     In the event that, notwithstanding the foregoing, any payment or
distribution of assets of the Company of any kind or character, whether in cash,
property or securities, prohibited by the foregoing, shall be received by the
Holders of the Securities or by the Trustee on behalf of such Holders in
violation of this Article Fourteen, such payment or distribution shall be held
in trust for the benefit of and shall be paid over or delivered to the holders
of Senior Indebtedness (pro rata to such holders on the basis of the respective
amounts of Senior Indebtedness held by such holders) or their representative or
representatives, or to the trustee or trustees under any indenture pursuant to
which any instruments evidencing any Senior Indebtedness may have been issued,
as their respective interests may appear, for application to the payment of all
Senior Indebtedness remaining unpaid in full in money or monies worth in
accordance with its terms, after giving effect to any concurrent payment or
distribution or provision therefor to or for the holders of such Senior
Indebtedness.

Section 1405. Subrogation to Rights of Holders of Senior Indebtedness.

     Subject to the payment in full of all Senior Indebtedness, the Holders of
the Securities shall be subrogated to the rights of the holders of Senior
Indebtedness to receive payments or distributions of cash, property or
securities of the Company applicable to the Senior Indebtedness until the
Obligations on the Securities shall be paid in full; and, for the purposes of
such subrogation, no payment or distributions to the holders of the Senior
Indebtedness of any cash, property or securities to which the Holders of the
Securities or the Trustee would be entitled except for the provisions of this
Article Fourteen, and no payment over pursuant to the provisions of this Article
Fourteen, to or for the benefit of the holders of Senior Indebtedness by Holders
of the Securities or the Trustee, shall, as between the Company, its creditors
other than holders of Senior Indebtedness, and the 

                                      68
<PAGE>
 
Holders of the Securities, be deemed to be a payment by the Company to or on
account of the Senior Indebtedness. It is understood that the provisions of this
Article Fourteen are and are intended solely for the purposes of defining the
relative rights of the Holders of the Securities, on the one hand, and the
holders of the Senior Indebtedness on the other hand.

Section 1406. Unconditional Obligation.

     Nothing contained in this Article Fourteen or elsewhere in this Indenture
or in the Securities is intended to or shall impair, as between the Company and
the Holders of the Securities, the obligation of the Company, which is absolute
and unconditional, to pay to the Holders of the Securities the principal of (and
premium, if any) and interest on the Securities as and when the same shall
become due and payable in accordance with their terms, or is intended to or
shall affect the relative rights of the Holders of the Securities and creditors
of the Company other than the holders of the Senior Indebtedness, nor shall
anything herein or therein prevent the Trustee or the Holder of any Security
from taking any action to accelerate the maturity of Securities pursuant to
Section 502 or from exercising all remedies otherwise permitted by applicable
law upon default under this Indenture, subject to the rights, if any, under this
Article Fourteen of the holders of Senior Indebtedness in respect of cash,
property or securities of the Company received upon the exercise of any such
remedy.

Section 1407. Trustee to Effectuate Subordination.

     Each Holder of a Security by his acceptance thereof authorizes and directs
the Trustee in his behalf to take such action as may be necessary or appropriate
to effectuate the subordination provided in this Article Fourteen and appoints
the Trustee his attorney-in-fact for any and all such purposes.

Section 1408. Notice to Trustee.

     The Company shall give prompt written notice to a Responsible Officer of
the Trustee of any fact known to the Company which would prohibit the making of
any payment of monies to or by the Trustee in respect of the Securities pursuant
to the provisions of this Article Fourteen; provided, however, that except as
provided in Section 1402(c) hereof, nothing herein shall require the Company to
give any notice of a default on any of the Senior Indebtedness other than a
payment default, and the Company shall not be deemed a representative of the
Senior Indebtedness for purposes of instituting a Blockage Period.
Notwithstanding the provisions of this Article Fourteen or any other provision
of this Indenture, the Trustee shall not be charged with knowledge of the
existence of any facts which would prohibit the making of any payment of monies
to or by the Trustee in respect of the Securities pursuant to the provisions of
this Article Fourteen, unless and until a Responsible Officer of the Trustee
shall have received written notice thereof at the Corporate Trust Office of the
Trustee from the Company or a holder or holders of Senior Indebtedness or their
representative or representatives or from any trustee or trustees therefor; and
before the receipt of any such written notice, the Trustee, subject to the
provisions of Article Six, shall be entitled in all respects to assume that no
such facts exist; provided, however, that if the Trustee shall not have received
the notice provided for in this Section 1408 prior to the date upon which by the
terms hereof 

                                      69
<PAGE>
 
any money may become payable for any purpose (including, without limitation, the
payment of the principal of (or premium, if any) or interest on any Security),
then, anything herein contained to the contrary notwithstanding, the Trustee
shall have full power and authority to receive such money and to apply the same
to the purposes for which they were received.

     The Trustee shall be entitled to rely on information regarding amounts then
due and owing on the Senior Indebtedness, if any, received from the holders of
Senior Indebtedness (or their representatives) or, if such information is not
received from such holders or their representatives, from the Company and only
amounts included in the information provided to the Trustee shall be paid to the
holders of Senior Indebtedness.

     The Trustee, subject to the provisions of Article Six, shall be entitled to
rely on the delivery to it of a written notice by a Person representing himself
to be a holder of Senior Indebtedness (or a representative or trustee on behalf
of such holder) to establish that such notice has been given by a holder of
Senior Indebtedness or a representative or trustee on behalf of any such holder
or holders. In the event that the Trustee determines in good faith that further
evidence is required with respect to the right of any Person as a holder of
Senior Indebtedness to participate in any payment or distribution pursuant to
this Article Fourteen, the Trustee may request such Person to furnish evidence
to the reasonable satisfaction of the Trustee as to the amount of Senior
Indebtedness held by such Person, the extent to which such Person is entitled to
participate in such payment or distribution and any other facts pertinent to the
rights of such Person under this Article Fourteen, and if such evidence is not
furnished the Trustee may defer any payment to such Person pending judicial
determination as to the right of such Person to receive such payment.

     Upon any payment or distribution of assets of the Company referred to in
this Article Fourteen, the Trustee, subject to the provision of Article Six, and
the Holders of the Securities shall be entitled to rely upon any order or decree
made by any court of competent jurisdiction in which such dissolution, winding-
up, liquidation or reorganization proceedings are pending, or a certificate of
the receiver, trustee in bankruptcy, liquidation trustee, agent or other person
making such payment or distribution, delivered to the Trustee or to the Holders
of the Securities, for the purposes of ascertaining the persons entitled to
participate in such distribution, the holders of the Senior Indebtedness and
other indebtedness of the Company, the amount thereof or payable thereon, the
amount or amounts paid or distributed thereon and all other facts pertinent
thereto or to this Article Fourteen.

Section 1409. Rights of Trustee as Holder of Senior Indebtedness; Preservation
              of Trustee's Rights.

     The Trustee in its individual capacity shall be entitled to all the rights
set forth in this Article Fourteen in respect of any Senior Indebtedness at any
time held by it, to the same extent as any other holder of Senior Indebtedness,
and nothing in this Indenture shall deprive the Trustee of any of its rights as
such holder.

     Nothing in this Article Fourteen shall apply to claims of, or payments to,
the Trustee under or pursuant to Section 607.

                                      70
<PAGE>
 
Section 1410. Trustee Not Fiduciary for Holders of Senior Indebtedness.

     The Trustee shall not be deemed to owe any fiduciary duty to the holders of
Senior Indebtedness and, subject to the provisions of Article Six, the Trustee
shall not be liable to any holder of Senior Indebtedness if it shall in good
faith mistakenly pay over or deliver to Holders of Securities, the Company or
any other person money or assets to which any holder of Senior Indebtedness
shall be entitled by virtue of this Article Fourteen or otherwise.

Section 1411. No Waiver of Subordination Provisions.

     No right of any present or future holder of any Senior Indebtedness to
enforce subordination as herein provided shall at any time in any way be
prejudiced or impaired by any act or failure to act on the part of the Company
or by any act or failure to act, in good faith, by any such holder, or by any
noncompliance by the Company with the terms, provisions and covenants of this
Indenture, regardless of any knowledge thereof which any such holder may have or
otherwise be charged with.

     Without in any way limiting the generality of the foregoing paragraph, the
holders of Senior Indebtedness may, at any time and from time to time, without
the consent of or notice to the Trustee or the Holders of the Securities,
without incurring responsibility to the Holders of the Securities and without
impairing or releasing the subordination provided in this Article or the
obligations hereunder of the Holders of the Securities to the holders of Senior
Indebtedness, do any one or more of the following: (i) change the manner, place
or terms of payment or extend the time of payment of, or renew or alter, Senior
Indebtedness, or otherwise amend or supplement in any manner Senior Indebtedness
or any instrument evidencing the same or any agreement under which Senior
Indebtedness is outstanding; (ii) sell, exchange, release or otherwise deal with
any property pledged, mortgaged or otherwise securing Senior Indebtedness; (iii)
release any person liable in any manner for the collection of Senior
Indebtedness; and (iv) exercise or refrain from exercising any rights against
the Company and any other Person.

     Each Holder by purchasing or accepting a Security waives any and all notice
of the creation, modification, renewal, extension or accrual of any Senior
Indebtedness and notice of or proof of reliance by any holder or owner of Senior
Indebtedness upon this Article Fourteen and Senior Indebtedness shall
conclusively be deemed to have been created, contracted or incurred in reliance
upon this Article Fourteen, and all dealings between the Company and the holders
and owners of Senior Indebtedness shall be deemed to have been consummated in
reliance upon this Article Fourteen.

                                      71
<PAGE>
 
Section 1412. Defeasance of this Article Fourteen.

     The subordination of the Securities provided by this Article Fourteen shall
apply only to Securities that are Outstanding under this Indenture and is
expressly made subject to the provisions for Defeasance or Covenant Defeasance
in Article Thirteen hereof and the provisions for satisfaction and discharge of
this Indenture in Article Four hereof and, anything herein to the contrary
notwithstanding, upon the effectiveness of any such Defeasance or Covenant
Defeasance or any such satisfaction and discharge, the Securities then
Outstanding shall thereupon cease to be subordinated pursuant to this Article
Fourteen.

     This instrument may be executed in any number of counterparts, each of
which so executed shall be deemed to be an original, but all such counterparts
shall together constitute but one and the same instrument.

     IN WITNESS WHEREOF, the parties hereto have caused this Indenture to be
duly executed all as of the day and year first above written.

                              IMPAC MORTGAGE HOLDINGS, INC.


                              By: /s/ Richard J. Johnson
                                 ----------------------------------------

                              Its: Executive Vice President &
                                  ---------------------------------------
                                   Chief Financial Officer

Attest:


By: /s/ Ron Morrison
   ----------------------

Its: Secretary
    ---------------------
                              By: /s/ Terence Rawlins
                                 ----------------------------------------

                               IBJ WHITEHALL BANK & TRUST COMPANY
                               as Trustee


                              By: Assistant Vice President
                                 ----------------------------------------

Attest:

By: /s/ Michael Daly
   ----------------------

Its: Assistant Secretary
   ----------------------

<PAGE>
 
STATE OF            )
                    ) ss.
COUNTY OF           )

          On the 26th day of March, 1999 before me ___________________________,
personally came Richard Johnson, to me known, who, being by me duly sworn, did
depose and say that he is EVP, CFO of Impac Mortgage Holdings, Inc., one of the
corporations described in and which executed the foregoing instrument.


                                                    Official Stamp
                                                    J. Smith

STATE OF            )
                    ) ss.
COUNTY OF           )

          On the 29 day of March, 1999, before me __________________________,
personally came Terence Rawlins, to me known, who, being by me duly sworn, did
depose and say that he is AVP of IBJ Whitehall Bank & Trust Company, one of the
corporations described in and which executed the foregoing instrument; that he
knows the seal of said corporation; that the seal affixed to said instrument is
such corporate seal; that it was so affixed by authority of the Board of
Directors of said corporation; and that he signed his name thereto by like
authority.


                                                    Official Stamp
                                                    Theresa C. Guarino
                                      73

<PAGE>
 
                                                               EXHIBIT 99(a)(12)

                         IMPAC MORTGAGE HOLDINGS, INC.
                                      AND
                      IBJ WHITEHALL BANK & TRUST COMPANY
                                  As Trustee

                         First Supplemental Indenture
                          Dated as of March 29, 1999
                                      To
                                   Indenture
                          Dated as of March 29, 1999

           11% Senior Subordinated Debentures due February 15, 2004


     FIRST SUPPLEMENTAL INDENTURE, dated as of March 29, 1999, between Impac
Mortgage Holdings, Inc., a corporation duly organized and existing under the
laws of the State of Maryland (herein called the "Company"), having its
principal office at 20371 Irvine Avenue, Santa Ana Heights, California 92707,
and IBJ Whitehall Bank & Trust Company, a New York banking corporation, as
Trustee (herein called the "Trustee") under the Indenture dated as of March 29,
1999 between the Company and the Trustee (the "Indenture"). All terms used in
this First Supplemental Indenture which are defined in the Indenture shall have
the meanings assigned to them in the Indenture.

                            RECITALS OF THE COMPANY

     WHEREAS, the Company has executed and delivered the Indenture to the
Trustee to provide for the issuance from time to time of its unsecured
debentures, notes or other evidences of indebtedness (the "Securities"), said
Securities to be issued in one or more series as provided in the Indenture.

     WHEREAS, pursuant to the terms of the Indenture, the Company desires to
provide for the establishment of a new series of its Securities to be known as
its 11% Senior Subordinated Debentures due February 15, 2004 (herein called the
"Debentures"), the form and substance of such Debentures and the terms,
provisions and conditions thereof to be set forth as provided in the Indenture
and this First Supplemental Indenture.

     WHEREAS, all things necessary to make this First Supplemental Indenture a
valid agreement of the Company, and to make the Debentures, when executed by the
Company and authenticated and delivered by the Trustee, the valid obligations of
the Company, have been done.

     Now, Therefore, This First Supplemental Indenture Witnesseth:

     For and in consideration of the premises and the purchase of the Debentures
by the Holders thereof, and for the purpose of setting forth, as provided in the
Indenture, the form and substance of the Debentures and the terms, provisions
and conditions thereof, it is mutually agreed, for the equal and proportionate
benefit of all Holders of the Debentures, as follows:
<PAGE>
 
                                  ARTICLE ONE

                        GENERAL TERMS AND CONDITIONS OF
                                 THE DEBENTURES

     Section 101.  Section 301 of the Indenture is hereby amended by adding the
following Section 301.1:

          Section 301.1  11% Senior Subordinated Debentures due February 15,
          2004

          There shall be and is hereby authorized:

          (1) A series of Securities designated the "11% Senior Subordinated
          Debentures due February 15, 2004" (the "Debentures").

          (2) This series is limited in aggregate principal amount to no more
          than $35,000,000, which amount shall be as set forth in any written
          order of the Company for the authentication and delivery of
          Debentures.

          (3) Principal and interest on the Debentures will be payable to all
          Holders of record on the last day of the month preceding the relevant
          Interest Payment Date.

          (4) The Debentures shall mature and the principal shall be due and
          payable together with all accrued and unpaid interest thereon on
          February 15, 2004, except as otherwise provided in Section 301.1(6),
          below.

          (5) The Debentures shall bear interest at the rate of 11% per annum
          from their date of original  issuance, payable quarterly on February
          15, May 15, August 15 and November 15, or, in the event that such
          15/th/ day is not a Business Day, then on the Business Day immediately
          following such 15/th/ day (and without any interest or other payment
          in respect of any such delay) in each case with the same force and
          effect as if made on such date (each an "Interest Payment Date"),
          commencing on May 15, 1999. The amount of interest payable for any
          period will be computed on the basis of a 360-day year of twelve 30-
          day months. Interest will accrue from the date of original issuance
          to, but not including, the relevant Interest Payment Date. Any such
          interest installment not punctually paid or duly provided for shall
          forthwith cease to be payable to the registered holders on such
          Regular Record Date, and may be paid to the person in whose name the
          Debenture (or one or more Predecessor Securities) is registered at the
          close of business on a Special Record Date to be fixed by the Trustee
          for the payment of such defaulted interest, notice whereof shall be
          given to the registered holders of the Debentures not less than 10
          days prior to such Special Record Date, or may be paid at any time in
          any other lawful manner not inconsistent with the requirements of any
          securities exchange on which the Debentures may be listed, and upon
          such notice as may be required by such exchange, all as more fully
          provided in the Indenture.
 
          (6) The Company may at any time before the day which is 15 days before
          February 15, 2004, make a one time election to extend the Maturity to
          May 15, 2004, provided that,

                                       2
<PAGE>
 
          (i) the Company gives notice of its election to the Holders and the 
          Trustee and (ii) an Event of Default does not exist at the date of
          notice of the extension. In the event the Company elects to extend the
          Maturity, interest will accrue from and after February 15, 2004 to the
          extended Maturity at the rate of 11.025% per annum.

          (7) Principal and interest on the Debentures will be payable, the
          transfer of such Debentures will be registrable and such Debentures
          will be exchangeable for the Debentures bearing identical terms and
          provisions at the Corporate Trust Office of the Trustee from time to
          time, which is initially in New York, New York; provided, however,
          that payment of interest may be made at the option of the Company by
          (i) check mailed to the registered holder at such address as shall
          appear in the Security Register or (ii) transfer to an account
          maintained by the payee in the United States.
 
          (8) The Debentures will be redeemable in whole at any time or in part
          from time to time, any time on or after February 15, 2001and prior to
          Maturity at the option of the Company,  upon not less than 30 nor more
          than 60 days' notice, at the principal amount to be redeemed, together
          with accrued and unpaid interest thereon, if any, to the date fixed
          for redemption.

          (9) The Company will not establish a sinking fund for the retirement
          of the Debentures.

          (10) The Debentures will be issuable in denominations of $25 and any
          integral multiple thereof.

          (11) The Debentures shall be defeasible pursuant to Section 1302 and
          Section 1303 of the Indenture.

                                  ARTICLE TWO

                              FORM OF DEBENTURES

     Section 201.  The Debentures and the Trustee's certificate of
authentication to be endorsed thereon are to be substantially in the following
form:


                         IMPAC MORTGAGE HOLDINGS, INC.
           11% Senior Subordinated Debentures due February 15, 2004


No. _____________                                       $_________

                                                                CUSIP NO. 45254P

     Impac Mortgage Holdings, Inc., a corporation duly organized and existing
under the laws of Maryland (herein called the "Company," which term includes any
successor Person under the Indenture hereinafter referred to), for value
received, hereby promises to pay to ______________________________ or
registered assigns, the ______________ principal sum of Dollars on
February 15, 2004,

                                       3
<PAGE>
 
unless extended to a date no later than May 15, 2004, and to pay interest
thereon from the original date of issuance or from the most recent Interest
Payment Date to which interest has been paid or duly provided for, quarterly on
February 15, May 15, August 15 and November 15 in each year, commencing May 15,
1999, at the rate of 11% per annum, until the principal hereof is paid or made
available for payment, provided that any principal and any such installment of
interest outstanding after February 15, 2004 shall bear interest at the rate of
11.025% per annum. The interest so payable, and punctually paid or duly provided
for, on any Interest Payment Date will, as provided in such Indenture, be paid
to the Person in whose name this Security (or one or more Predecessor
Securities) is registered at the close of business on the Regular Record Date
for such interest, which shall be January 31, April 30, July 31 or October 31
(whether or not a Business Day), as the case may be, next preceding such
Interest Payment Date. Any such interest not so punctually paid or duly provided
for will forthwith cease to be payable to the Holder on such Regular Record Date
and may either be paid to the Person in whose name this Security (or one or more
Predecessor Securities) is registered at the close of business on a Special
Record Date for the payment of such Defaulted Interest to be fixed by the
Trustee, notice whereof shall be given to Holders of Securities of this series
not less than 10 days prior to such Special Record Date, or be paid at any time
in any other lawful manner not inconsistent with the requirements of any
securities exchange on which the Securities of this series may be listed, and
upon such notice as may be required by such exchange, all as more fully provided
in said Indenture.

     Payment of the principal of and interest on this Security will be made at
the office or agency of the Company maintained for that purpose in New York, New
York, in such coin or currency of the United States of America as at the time of
payment is legal tender for payment of public and private debts; provided,
however, that at the option of the Company payment of interest may be made by
(i) check mailed to the address of the Person entitled thereto as such address
shall appear in the Security Register; or (ii) transfer to an account maintained
by the payee located in the United States.

     Reference is hereby made to the further provisions of this Security set
forth on the reverse hereof, which further provisions shall for all purposes
have the same effect as if set forth at this place.

     Unless the certificate of authentication hereon has been executed by the
Trustee referred to on the reverse hereof by manual signature, this Security
shall not be entitled to any benefit under the Indenture or be valid or
obligatory for any purpose.

     IN WITNESS WHEREOF, the Company has caused this instrument to be duly
executed.

                              IMPAC MORTGAGE HOLDINGS, INC.


By:_____________________________

   Attest:

   ______________________________
     Form of Reverse of Security.

     This Security is one of a duly authorized issue of securities of the
Company (herein called the "Securities"), issued and to be issued in one or more
series under an Indenture, dated as of _______ __, 1999 (herein called the
"Indenture", which term shall have the meaning assigned to it in such
instrument), between the Company and IBJ Whitehall Bank & Trust Company, as
Trustee (herein called the "Trustee", which term includes any successor trustee
under the Indenture), and reference is hereby made to the Indenture for a

                                       4
<PAGE>
 
statement of the respective rights, limitations of rights, duties and immunities
thereunder of the Company, the Trustee and the Holders of the Securities and of
the terms upon which the Securities are, and are to be, authenticated and
delivered. This Security is one of the series designated on the face hereof,
limited in aggregate principal amount to $35,000,000.

     The Securities of this series are subject to redemption upon not less than
30 days' notice by mail, at any time after February 15, 2001, in whole at any
time or in part from time to time, at the election of the Company, at a
Redemption Price equal to 100% of the principal amount, together with accrued
interest to the Redemption Date, but interest installments whose Stated Maturity
is on or prior to such Redemption Date will be payable to the Holders of such
Securities, or one or more Predecessor Securities, of record at the close of
business on the relevant Record Dates referred to on the face hereof for such
interest installments, all as provided in the Indenture. The Indenture provides
that a notice of redemption may be given that is conditional upon the receipt by
the Trustee on or prior to the Redemption Date of amounts sufficient to pay
principal of, and premium, if any, and interest on, the Securities to be
redeemed, and that if such amounts shall not have been so received, said notice
shall be of no force and effect, the Securities to be redeemed will not become
due and payable on the Redemption Date, and the Company will not be required to
redeem such Securities on such date.

     In the event of redemption of this Security in part only, a new Security or
Securities of this series and of like tenor for the unredeemed portion hereof
will be issued in the name of the Holder hereof upon the cancellation hereof.

     The Securities of this series are subordinate in right of payment, in the
manner and to the extent set forth in the Indenture, to the prior payment in
full of all Obligations on Senior Indebtedness,  including any  Designated
Senior Indebtedness, of the Company. To the extent and in the manner provided in
the Indenture, Obligations on Senior Indebtedness, including any Designated
Senior Indebtedness,  must be paid before any payment may be made to any Holder
of this Security. Any Holder by accepting this Security agrees to the
subordination and authorizes the Trustee to give it effect.

     The Indenture contains provisions for defeasance at any time of the entire
indebtedness of this Security or certain restrictive covenants and Events of
Default with respect to this Security, in each case upon compliance with certain
conditions set forth in the Indenture.

     If an Event of Default with respect to Securities of this series shall
occur and be continuing, the principal of the Securities of this series may be
declared due and payable in the manner and with the effect provided in the
Indenture.

     The Indenture permits, with certain exceptions as therein provided, the
amendment thereof and the modification of the rights and obligations of the
Company and the rights of the Holders of the Securities of each series to be
affected under the Indenture at any time by the Company and the Trustee without
the consent of any Holders in certain limited cases, and with the consent of the
Holders of a majority in principal amount of the Securities at the time
Outstanding of each series to be affected subject to certain exceptions. The
Indenture also contains provisions permitting the

                                       5
<PAGE>
 
Holders of specified percentages in principal amount of the Securities of each
series at the time Outstanding, on behalf of the Holders of all Securities of
such series, to waive compliance by the Company with certain provisions of the
Indenture and certain past defaults under the Indenture and their consequences.
Any such consent or waiver shall be conclusive and binding upon the Holder of
this Security and upon all future Holders of this Security and of any Security
issued upon the registration of transfer hereof or in exchange herefor or in
lieu hereof, whether or not notation of such consent or waiver is made upon this
Security.

     As provided in and subject to the provisions of the Indenture, the Holder
of this Security shall not have the right to institute any proceeding with
respect to the Indenture or for the appointment of a receiver or trustee or for
any other remedy thereunder, unless such Holder shall have previously given the
Trustee written notice of a continuing Event of Default with respect to the
Securities of this series, the Holders of not less than 25% in principal amount
of the Securities of this series at the time Outstanding shall have made written
request to the Trustee to institute proceedings in respect of such Event of
Default as Trustee and offered the Trustee reasonable indemnity, and the Trustee
shall not have received from the Holders of a majority in principal amount of
Securities of this series at the time Outstanding a direction inconsistent with
such request, and shall have failed to institute any such proceeding, for 60
days after receipt of such notice, request and offer of indemnity. The foregoing
shall not apply to any suit instituted by the Holder of this Security for the
enforcement of any payment of principal hereof or any premium or interest hereon
on or after the respective due dates expressed herein.

     No reference herein to the Indenture and no provision of this Security or
of the Indenture shall alter or impair the obligation of the Company, which is
absolute and unconditional, to pay the principal of and any premium and interest
on this Security at the times, place and rate, and in the coin or currency,
herein prescribed.

     As provided in the Indenture and subject to certain limitations therein set
forth, the transfer of this Security is registrable in the Security Register,
upon surrender of this Security for registration of transfer at the office or
agency of the Company in any place where the principal of and any premium and
interest on this Security are payable, duly endorsed by, or accompanied by a
written instrument of transfer in form satisfactory to the Company and the
Security Registrar duly executed by the Holder hereof or his attorney duly
authorized in writing, and thereupon one or more new Securities of this series
and of like tenor, of authorized denominations and for the same aggregate
principal amount, will be issued to the designated transferee or transferees.

     The Securities of this series are issuable only in registered form without
coupons in denominations of $25.00 and any integral multiple thereof. As
provided in the Indenture and subject to certain limitations therein set forth,
Securities of this series are exchangeable for a like aggregate principal amount
of Securities of this series and of like tenor of a different authorized
denomination, as requested by the Holder surrendering the same.

     No service charge shall be made for any such registration of transfer or
exchange, but the Company may require payment of a sum sufficient to cover any
tax or other governmental charge

 

                                       6
<PAGE>
 
payable in connection therewith.

     Prior to due presentment of this Security for registration of transfer, the
Company, the Trustee and any agent of the Company or the Trustee may treat the
Person in whose name this Security is registered as the owner hereof for all
purposes, whether or not this Security be overdue, and neither the Company, the
Trustee nor any such agent shall be affected by notice to the contrary.

     All terms used in this Security which are defined in the Indenture shall
have the meanings assigned to them in the Indenture.

I or we assign and transfer this Security to:

- ----------------------------------------------------------------
(Insert social security or other identifying number of assignee.)

- ----------------------------------------------------------------

- ----------------------------------------------------------------

- ----------------------------------------------------------------
(Print or type name, address and zip code of assignee)

and irrevocably appoint                               Agent to
                       -------------------------------
transfer this Security on the books of the Company. The agent may substitute
another to act for him.

Dated:
      ------------------------------------------------------------------

Signed:
       -----------------------------------------------------------------
(Sign exactly as name appears on the other side of this Security)


                                 ARTICLE THREE

                             ADDITIONAL COVENANTS

     Section 301.  Definitions for purposes of this Article Three, except as
otherwise expressly provided:  "Consolidated Net Worth" as of any date of
                                ----------------------                   
determination means the consolidated net worth of the Company and its
consolidated Subsidiaries as determined in accordance with GAAP.

     Section 302.  Minimum Equity.

     The Company shall, at all times while any of the Debentures remain
Outstanding, maintain Consolidated Net Worth of the lesser of $70 million or two
times the aggregate principal amount of Debentures issued.

                                       7
<PAGE>
 
                                  ARTICLE FOUR

                        APPLICATION OF ARTICLE FOURTEEN

     Section 401.  The Debentures will be subject to the subordination
provisions of Article Fourteen of the Indenture. Notwithstanding the definition
of Senior Indebtedness in the Indenture, for purposes of the Debentures, Senior
Indebtedness will include Designated Senior Indebtedness.


                                  ARTICLE FIVE

                          ORIGINAL ISSUE OF DEBENTURES

     Section 501.  Debentures in the aggregate principal amount of $7,747,100,
may, upon execution of this First Supplemental Indenture, or from time to time
thereafter, be executed by the Company and delivered to the Trustee for
authentication, and the Trustee shall thereupon authenticate and deliver said
Debentures upon receipt of a Company Order.


                                  ARTICLE SIX

                PAYING AGENT, EXCHANGE AGENT AND TRANSFER AGENT

     Section 601.  The Trustee will be the Paying Agent, Exchange Agent and
Transfer Agent for the Debentures.

     This instrument may be executed in any number of counterparts, each of
which so executed shall be deemed to be an original, but all such counterparts
shall together constitute but one and the same instrument.

                                       8
<PAGE>
 
     IN WITNESS WHEREOF, the parties hereto have caused this First Supplemental
Indenture to be duly executed all as of the day and year first above written.

                              IMPAC MORTGAGE HOLDINGS, INC.



                              By: /s/ Richard J. Johnson
                                 --------------------------
                              Its: Executive Vice President &
                                  ---------------------------
                                   Chief Financial Officer

Attest:   

By: /s/ Ron Morrison
   -------------------------
Its: Secretary
    ------------------------
                              
                              IBJ WHITEHALL BANK & TRUST COMPANY,
                              As Trustee

                              By: /s/ Terence Rawlins
                                 -------------------------
                              Its: Assistant Vice President
                                  -------------------------

 Attest:


By: /s/ Michael Daly
   ------------------------
Its: Assistant Secretary
    -----------------------

<PAGE>
 
State of California )
                    ) ss.:
County of Orange    )

     On the 26 day of March 1999, before me personally came Richard Johnson to
me known, who being by me duly sworn, did depose and say that she/he is the EVP,
CFO of Impac Mortgage Holdings, Inc., one of the corporations described in and
which executed the foregoing instrument; and that she/he signed her/his name
thereto by the authority of the Board of Directors of said Corporation.


     Official Seal                             Official Stamp
                                               J. Smith
     (seal) 
     



State of New York,  )
                    ) ss.:
County of ________  )

     On the 29 day of March, 1999, before me personally came Terence Rawlins,
to me known, who being by me duly sworn, did depose and say that she/he is the
AVP of IBJ Whitehall Bank & Trust Company, one of the corporations described in
and which executed the foregoing instrument; that she/he knows the seal of said
corporation; that the seal affixed to said instrument is such corporate seal;
that it was so affixed by authority of the Board of Directors of said
corporation; and that she/he signed her/his name thereto by like authority.


     Official Seal                             Official Stamp
                                               Theresa C. Guarino
     (seal)

                                       10


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