TETRA TECH INC
8-K/A, 1997-09-19
ENGINEERING SERVICES
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<PAGE>

                          SECURITIES AND EXCHANGE COMMISSION
                               Washington, D.C.  20549


                                      Form 8-K/A
                                  (Amendment No. 3)
                                           

                  Current Report Pursuant to Section 13 or 15(d) of
                              The Securities Act of 1934
                                           



Date of Report (Date of earliest event reported)          June 11, 1997
                                                 -----------------------------



                                Tetra Tech, Inc.
- ------------------------------------------------------------------------------
                (Exact name of registrant as specified in its charter)



         Delaware                      0-19566                 95-4148514
- ----------------------------         -----------           ------------------
(State or other jurisdiction         (Commission            (I.R.S. Employer
     of incorporation)               File Number)          Identification No.)



   670 N. Rosemead Boulevard, Pasadena, California             91107-2190
   -----------------------------------------------             ----------
       (Address of principal executive offices)                (Zip Code)  



Registrant's telephone number, including area code       (626) 351-4664
                                                   ---------------------------



                               Not Applicable
       --------------------------------------------------------------
       (Former name or former address, if changed since last report.)


<PAGE>

    The undersigned Registrant hereby amends the following item of its Current
Report on Form 8-K for the event of June 11, 1997:

ITEM 7.  FINANCIAL STATEMENTS AND EXHIBITS.

         (a) FINANCIAL STATEMENTS OF BUSINESSES ACQUIRED.

                (i) Independent Auditors' Report of Deloitte & Touche LLP 
                    dated August 8, 1997

               (ii) Independent Public Accountants' Report of 
                    Arthur Andersen LLP dated November 1, 1996

              (iii) Whalen & Company, Inc. Balance Sheets for the Years 
                    Ended December 31, 1996 and 1995

               (iv) Whalen & Company, Inc. Statements of Income for the Years 
                    Ended December 31, 1996, 1995 and 1994

                (v) Whalen & Company, Inc. Statements of Stockholder's Equity 
                    for the Years Ended December 31, 1996, 1995 and 1994

               (vi) Whalen & Company, Inc. Statements of Cash Flows for the 
                    Years Ended December 31, 1996, 1995 and 1994

              (vii) Whalen & Company, Inc. Notes to Financial Statements for 
                    the Years Ended December 31, 1996, 1995 and 1994

             (viii) Whalen & Company, Inc. Unaudited Balance Sheets as of 
                    March 31, 1997 and December 31, 1996

               (ix) Whalen & Company, Inc. Unaudited Statements of Income for 
                    the Three Months Ended March 31, 1997 and March 31, 1996

                (x) Whalen & Company, Inc. Unaudited Statements of Cash Flows 
                    for the Three Months Ended March 31, 1997 and March 31, 1996

               (xi) Whalen & Company, Inc. Notes to the Unaudited Financial 
                    Statements for the Three Months Ended March 31, 1997 and
                    March 31, 1996


         (b) PRO FORMA FINANCIAL INFORMATION.

                (i) Tetra Tech, Inc. and Whalen & Company, Inc. Unaudited 
                    Pro Forma Condensed Consolidated Statement of Operations 
                    for the Year Ended September 29, 1996

<PAGE>

               (ii) Tetra Tech, Inc. and Whalen & Company, Inc. Unaudited 
                    Pro Forma Condensed Consolidated Statement of Operations 
                    for the Nine Months Ended June 29, 1997

              (iii) Tetra Tech, Inc. and Whalen & Company, Inc. Notes to 
                    Unaudited Pro Forma Condensed Consolidated Financial 
                    Statements for the Year Ended September 29, 1996 and 
                    the Nine Months Ended June 29, 1997


         (c)  EXHIBITS.

               23.1 Consent of Deloitte & Touche LLP
              
               23.2 Consent of Arthur Andersen LLP

               27   Financial Data Schedule (previously filed with Amendment 
                    No. 2 to this Report on Form 8-K)

<PAGE>

REPORT OF DELOITTE & TOUCHE LLP


To the Board of Directors and Stockholder 
  of Whalen & Company, Inc.:

We have audited the accompanying balance sheet of Whalen & Company, Inc. as 
of December 31, 1996, and the related statements of income, stockholder's 
equity and cash flows for the year then ended.  We have also audited the 
statements of income, stockholder's equity and cash flows for the year ended 
December 31, 1994.  These financial statements are the responsibility of the 
Company's management.  Our responsibility is to express an opinion on the 
financial statements based on our audits.

We conducted our audits in accordance with generally accepted auditing 
standards.  Those standards require that we plan and perform the audit to 
obtain reasonable assurance about whether the financial statements are free 
of material misstatement.  An audit includes examining, on a test basis, 
evidence supporting the amounts and disclosures in the financial statements.  
An audit also includes assessing the accounting principles used and 
significant estimates made by management as well as evaluating the overall 
financial statement presentation. We believe that our audits provide a 
reasonable basis for our opinion.

In our opinion, such financial statements present fairly, in all material 
respects, the financial position of Whalen & Company, Inc. at December 31, 
1996, and the results of their operations and their cash flows for the years 
ended December 31, 1996 and December 31, 1994 in conformity with generally 
accepted accounting principles.

DELOITTE & TOUCHE LLP


San Jose, California
August 8, 1997


<PAGE>

                       REPORT OF INDEPENDENT PUBLIC ACCOUNTANTS
                                           
                                           
                                           
To the Management of 
Whalen & Company, Inc.:

We have audited the accompanying balance sheet of Whalen & Company, Inc. (the 
Company) as of December 31, 1995, and the related statements of operations, 
stockholder's equity and cash flows for the year then ended.  These financial 
statements are the responsibility of the Company's management.  Our 
responsibility is to express an opinion on these financial statements based 
on our audit.

We conducted our audit in accordance with generally accepted auditing 
standards. Those standards require that we plan and perform the audit to 
obtain reasonable assurance about whether the financial statements are free 
of material misstatement.  An audit includes examining, on a test basis, 
evidence supporting the amounts and disclosures in the financial statements.  
An audit also includes assessing the accounting principles used and 
significant estimates made by management, as well as evaluating the overall 
financial statement presentation. We believe that our audit provides a 
reasonable basis for our opinion.

In our opinion, the financial statements referred to above present fairly, in 
all material respects, the financial position of Whalen & Company, Inc. as of 
December 31, 1995, and the results of its operations and its cash flows for 
the year then ended, in conformity with generally accepted accounting 
principles.

ARTHUR ANDERSEN LLP


San Francisco, California,
  November 1, 1996
<PAGE>


                                WHALEN & COMPANY, INC.
                                    BALANCE SHEETS
                        YEARS ENDED DECEMBER 31, 1996 AND 1995
                                           
                                           

(In thousands, except share amounts)                          1996       1995 
                                                            --------   --------
                                ASSETS
CURRENT ASSETS:
  Cash and equivalents. . . . . . . . . . . . . . . . . .   $  3,126   $    783
  Accounts receivable, less allowance for doubtful accounts                    
    of $2,020 and $195 in 1996 and 1995, respectively . .     24,941     15,205
  Prepaid expenses and other. . . . . . . . . . . . . . .        472        566
                                                            --------   --------
         Total current assets . . . . . . . . . . . . . .     28,539     16,554
                                                                               
PROPERTY AND EQUIPMENT, Net . . . . . . . . . . . . . . .        705        456
                                                                               
OTHER ASSETS. . . . . . . . . . . . . . . . . . . . . . .        682        360
                                                            --------   --------
TOTAL . . . . . . . . . . . . . . . . . . . . . . . . . .   $ 29,926   $ 17,370
                                                            --------   --------
                                                            --------   --------

                     LIABILITIES AND STOCKHOLDER'S EQUITY                      
                                                                               
CURRENT LIABILITIES:                                                           
  Accounts payable. . . . . . . . . . . . . . . . . . . .   $  1,119   $    804
  Accrued employee benefits . . . . . . . . . . . . . . .      2,830      2,766
  Other accrued liabilities . . . . . . . . . . . . . . .        509         --
  Deferred revenue. . . . . . . . . . . . . . . . . . . .         --      2,511
  Note payable to stockholder . . . . . . . . . . . . . .      1,446         --
                                                            --------   --------
         Total liabilities. . . . . . . . . . . . . . . .      5,904      6,081
                                                            --------   --------
COMMITMENTS AND CONTINGENCIES (Note 5)                                         
                                                                               
STOCKHOLDER'S EQUITY:                                                          
  Common stock, $1 par value; 150,000 shares authorized;                       
    100 shares issued outstanding . . . . . . . . . . . .         10         10
  Retained earnings . . . . . . . . . . . . . . . . . . .     24,012     11,279
                                                            --------   --------
                                                                               
         Total stockholder's equity . . . . . . . . . . .     24,022     11,289
                                                            --------   --------
                                                                               
TOTAL . . . . . . . . . . . . . . . . . . . . . . . . . .   $ 29,926   $ 17,370
                                                            --------   --------
                                                            --------   --------

                       See notes to financial statements.


<PAGE>
<TABLE>
<CAPTION>
                               WHALEN & COMPANY, INC.
                                STATEMENTS OF INCOME
                     YEARS ENDED DECEMBER 31, 1996, 1995 AND 1994
                                                                      
<S>                                              <C>          <C>          <C>
(In thousands)                                       1996        1995        1994
                                                  ---------    ---------   ---------

NET REVENUES:
  Management fees. . . . . . . . . . . . . . . .  $  45,773    $  44,733   $  41,145
  Per-site fees. . . . . . . . . . . . . . . . .     10,783        7,366       3,888
  Contract termination fee . . . . . . . . . . .         --           --         900
                                                   ---------    ---------   ---------
  Total net revenues . . . . . . . . . . . . . .     56,556       52,099      45,933

FIELD OPERATING EXPENSES . . . . . . . . . . . .     26,058       29,586      23,890
                                                   ---------    ---------   ---------
OPERATING INCOME . . . . . . . . . . . . . . . .     30,498       22,513      22,043

GENERAL AND ADMINISTRATIVE EXPENSES. . . . . . .     11,220        6,193       3,976
                                                   ---------    ---------   ---------
INCOME FROM OPERATIONS . . . . . . . . . . . . .     19,278       16,320      18,067
                                                   ---------    ---------   ---------
OTHER INCOME (EXPENSE), Net:
  Interest income. . . . . . . . . . . . . . . .         66          533          79
  Interest expense . . . . . . . . . . . . . . .        (35)        (110)       (234)
  Other expense, net . . . . . . . . . . . . . .        (74)        (756)        (48)
                                                   ---------    ---------   ---------
  Total other expense, net . . . . . . . . . . .        (43)        (333)       (203)
                                                   ---------    ---------   ---------
INCOME BEFORE INCOME TAXES . . . . . . . . . . .     19,235       15,987      17,864

STATE INCOME TAXES . . . . . . . . . . . . . . .        385          500         357
                                                   ---------    ---------   ---------
NET INCOME . . . . . . . . . . . . . . . . . . .  $  18,850    $  15,487   $  17,507
                                                   ---------    ---------   ---------
                                                   ---------    ---------   ---------

</TABLE>
                         See notes to financial statements.

<PAGE>

                           WHALEN & COMPANY, INC.
                    STATEMENTS OF STOCKHOLDER'S EQUITY
               YEARS ENDED DECEMBER 31, 1996, 1995 AND 1994


(In thousands, except share amounts)
  
                                        Common Stock                Total
                                       --------------  Retained  Stockholder's  
                                       Shares  Amount  Earnings     Equity
                                       ------  ------  --------  -------------
BALANCES, January 1, 1994. . . . . . .   100   $  10    $   705    $    715

Net income . . . . . . . . . . . . . .    --      --     17,507      17,507
                                       ------  ------   -------    --------
BALANCES, December 31, 1994. . . . . .   100      10     18,212      18,222

Stockholder distribution . . . . . . .    --      --    (22,420)    (22,420)
Net income . . . . . . . . . . . . . .    --      --     15,487      15,487
                                       ------  ------   -------    --------
BALANCES, December 31, 1995. . . . . .   100      10     11,279      11,289

Stockholder distribution . . . . . . .    --      --     (6,117)     (6,117)
Net income . . . . . . . . . . . . . .    --      --     18,850      18,850
                                       ------  ------   -------    --------
BALANCES, December 31, 1996. . . . . .   100   $  10    $24,012    $ 24,022
                                       ------  ------   -------    --------
                                       ------  ------   -------    --------

                         See notes to financial statements.

<PAGE>

                                    WHALEN & COMPANY, INC.
                                   STATEMENTS OF CASH FLOWS
                         YEARS ENDED DECEMBER 31, 1996, 1995 AND 1994
<TABLE>
<CAPTION>
                                                                            
(In thousands)                                                       1996        1995       1994
                                                                   --------    --------   --------
<S>                                                              <C>         <C>        <C>
CASH FLOWS FROM OPERATING ACTIVITIES:                                                           
  Net income . . . . . . . . . . . . . . . . . . . . . . . . .   $ 18,850    $ 15,487   $ 17,507
  Reconciliation of net income to net cash provided by                                          
    operating activities:                                                                       
    Depreciation . . . . . . . . . . . . . . . . . . . . . . .        510         170         60
    Provision for doubtful accounts. . . . . . . . . . . . . .      1,825         195         --
    Changes in assets and liabilities:                                                          
      Accounts receivable. . . . . . . . . . . . . . . . . . .    (11,561)      1,001    (14,119)
      Prepaid expenses and other . . . . . . . . . . . . . . .         94        (151)      (291)
      Contract termination receivable. . . . . . . . . . . . .        180         180       (540)
      Other assets . . . . . . . . . . . . . . . . . . . . . .       (502)         --         --
      Accounts payable . . . . . . . . . . . . . . . . . . . .        315         755         35
      Accrued employee benefits. . . . . . . . . . . . . . . .         64         422      1,495
      Other accrued liabilities. . . . . . . . . . . . . . . .        509        (782)       553
      Deferred revenue . . . . . . . . . . . . . . . . . . . .     (2,511)      2,511         --
                                                                 --------    --------   --------
                                                                                                
        Net cash provided by operating activities. . . . . . .      7,773      19,788      4,700
                                                                 --------    --------   --------
                                                                                                
CASH FLOWS FROM INVESTING ACTIVITIES:                                                           
  Purchase of long-term investment . . . . . . . . . . . . . .         --          --        (25)
  Sale of long-term investment . . . . . . . . . . . . . . . .         --          25         --
  Purchases of property and equipment. . . . . . . . . . . . .       (763)       (369)      (173)
  Proceeds from sale of property and equipment . . . . . . . .          4          16         --
                                                                 --------    --------   --------
                                                                                                
        Net cash used in investing activities. . . . . . . . .       (759)       (328)      (198)
                                                                 --------    --------   --------
                                                                                                
CASH FLOWS FROM FINANCING ACTIVITIES:                                                           
  Issuance of note payable to stockholder. . . . . . . . . . .      1,500          --      1,002
  Repayments of notes payable to stockholder . . . . . . . . .       (54)     (3,069)       (251)
  Distribution to stockholder. . . . . . . . . . . . . . . . .     (6,117)    (22,420)        --
                                                                 --------    --------   --------

        Net cash provided by (used in) financing activities. .     (4,671)    (25,489)       751
                                                                 --------    --------   --------

NET CHANGE IN CASH AND EQUIVALENTS . . . . . . . . . . . . . .      2,343      (6,029)     5,253

CASH AND EQUIVALENTS, Beginning of year. . . . . . . . . . . .        783       6,812      1,559
                                                                 --------    --------   --------

CASH AND EQUIVALENTS, End of year. . . . . . . . . . . . . . .   $  3,126    $    783   $  6,812
                                                                 --------    --------   --------
                                                                 --------    --------   --------
SUPPLEMENTAL DISCLOSURE OF CASH FLOW 
  INFORMATION:
  Cash paid for interest . . . . . . . . . . . . . . . . . . .   $     --    $    110   $    234
                                                                 --------    --------   --------
                                                                 --------    --------   --------

  Cash paid for income taxes . . . . . . . . . . . . . . . . .   $     53    $    495   $     40
                                                                 --------    --------   --------
                                                                 --------    --------   --------
</TABLE>
                                See notes to financial statements.

<PAGE>
                                WHALEN & COMPANY, INC.
                            NOTES TO FINANCIAL STATEMENTS
                     YEARS ENDED DECEMBER 31, 1996, 1995 AND 1994
                                                  
1.   SIGNIFICANT ACCOUNTING POLICIES

     DESCRIPTION OF BUSINESS - Whalen & Company, Inc. (the "Company") is a
Delaware Chapter S corporation that was formed effective August 25, 1987.  Dan
Whalen is the founder and sole stockholder of the Company.

     The Company provides program and turnkey project development consulting
services on a contract basis to customers who build and operate wireless
networks.  The Company offers a range of services from single-site deployments
to the implementation of complete wireless network systems.   The Company has
consulting experience in PCS, cellular, ESMR, wireless, air-to-ground,
microwave, paging, fiber optic and switching center systems.

     The Company provides services in North America, South America, Asia,
Australia and Europe.

     FINANCIAL STATEMENT ESTIMATES - The preparation of financial statements in
conformity with generally accepted accounting principles requires management to
make estimates and assumptions that affect the reported amounts of assets and
liabilities and disclosure of contingent assets and liabilities at the date of
the financial statements and the reported amounts of revenues and expenses
during the reporting period.  Significant estimates include a provision for
doubtful accounts.  Actual results could differ from estimates.

     CASH AND EQUIVALENTS - Cash and equivalents include cash and highly liquid
debt instruments with original maturities of three months or less.

     ACCOUNTS RECEIVABLE - Accounts receivable includes billed and unbilled
accounts receivable.  Total unbilled accounts receivable were $6,794,000 and
$3,061,000 as of December 31, 1996 and 1995, respectively.

     CONCENTRATION OF CREDIT RISK - Financial instruments which potentially
subject the Company to concentrations of credit risk consist primarily of cash
and equivalents and accounts receivable.  The Company places its cash and
equivalents for safekeeping with high-credit-quality financial institutions. 
The Company performs ongoing credit evaluations of its customers and generally
requires that customers remit payment for billed revenue within 30 days.  The
Company maintains reserves for estimated credit losses.  See Note 7 concerning
significant customers.

     PROPERTY AND EQUIPMENT - Property and equipment are stated at cost. 
Depreciation is computed using the straight-line method over the estimated
useful lives of the assets ranging from two to seven years.

<PAGE>

     REVENUE RECOGNITION - The Company recognizes management fee revenue as
project management and consulting services are performed in accordance with
customer contracts.  The recognition of revenue related to per-site fees is
deferred until milestones in the Company's customer contracts have been met and
collection is reasonably assured.  Per-site fees in 1996 include $8,407,000 from
a single customer of which $2,511,000 were related to 1995 and had been deferred
as of December 31, 1995 due to the uncertainty of collection as of that date.

     REIMBURSABLE EXPENSES - Certain expenses incurred by the Company are passed
on to customers in accordance with customer contract agreements.  The Company
records the expense and reimbursement on a gross basis.  The amounts included in
management fees and field operating expenses were $6,861,000, $7,122,000 and
$6,128,000 in 1996, 1995 and 1994, respectively.

     FAIR VALUE OF FINANCIAL INSTRUMENTS - Financial instruments include cash
equivalents and long-term obligations.  Cash equivalents are stated at cost
which approximates fair market value based on quoted market prices.  The
carrying amount of the Company's long-term obligations approximates fair market
value.

     INCOME TAXES - The Company's stockholder elected to be taxed as an S
corporation under the provisions of the Internal Revenue Code.  Under these
provisions, the Company does not pay federal corporate income taxes on its
taxable income.  As a Chapter S corporation, the Company is required to pay
state income taxes to the states in which it conducts business.

     RECLASSIFICATIONS - Certain reclassifications to the 1995 financial
statements have been made to conform to the 1996 presentation.


2.   PROPERTY AND EQUIPMENT, NET

     Property and equipment at December 31 consist of the following (in
thousands):
     
                               1996           1995

     Furniture and fixtures   $  197         $ 168
     Office equipment            247           127
     Computer equipment          814           281
     Computer software            89           191
                              ------         -----
                               1,347           767
     Accumulated depreciation   (642)         (311)
                              ------         -----
                              $  705         $ 456
                              ------         -----
                              ------         -----

<PAGE>

3.   LONG-TERM RECEIVABLE

     On December 8, 1994, the Company reached a settlement on a contract
termination with a customer relating to a contract to provide construction
administration services that was canceled prior to December 8, 1994.  The
customer agreed to pay, as a settlement of all past and future amounts due,
$900,000 over five years beginning in 1994.  As of December 31, 1996, $360,000
of the settlement amount is still outstanding.
     
     The Company has included $180,000 of the outstanding balance in current
accounts receivable for the portion due in 1997.  The remaining amount of
$180,000 is due during 1998 and is included in other assets.
     
     The principal amount of the receivable is adjusted each year for increases
in the Consumer Price Index.
          
          
4.   LINE OF CREDIT

     The Company has a revolving line of credit with a bank under which it may
borrow up to $5,000,000 through February 1998.  Borrowings bear interest at the
bank's reference rate (8.25% at December 31, 1996) and are personally guaranteed
by the sole stockholder.  There were no borrowings outstanding under the
revolving line of credit at December 31, 1996.
     
     
5.   COMMITMENTS AND CONTINGENCIES

     The Company leases office space for its corporate facilities.  All leases
are classified as operating leases.  The following is a schedule of the future
minimum rental payments required under operating leases that have initial or
remaining noncancelable terms in excess of one year as of December 31, 1996 (in
thousands):
     
          1997...............................   $ 87
          1998...............................     13
          1999...............................     13
          2000...............................     13
          2001...............................     12
                                                ----

          Total minimum lease payments          $138
                                                ----
                                                ----

     Lease payments charged to operations totaled $222,000, $153,000 and $80,000
for 1996, 1995 and 1994, respectively.



<PAGE>

6.   RELATED PARTY TRANSACTIONS

     NOTE PAYABLE TO STOCKHOLDER

     The sole stockholder of the Company advances the Company funds through
notes payable that are used for current operating and other costs and are due
upon demand.  In 1994, the stockholder note payable accrued interest at a rate
varying from 7% to 9%.  In January 1995, the note was amended to bear interest
at a rate of 9%.  Total interest expense related to the stockholder note payable
was $21,000, $110,000 and $234,000 for 1996, 1995 and 1994, respectively.

     At December 31, 1994, the Company had an outstanding stockholder note 
payable of $3,069,000.  The balance of the note payable was settled during 
1995. The Company paid income taxes and various expenses of the sole 
stockholder, which were recorded as a reduction in the stockholder note 
payable balance.

     In November 1996, the sole stockholder advanced the Company an 
additional $1,500,000 which accrues interest at 8.5%.

7.   MAJOR CUSTOMER INFORMATION

     Customers which accounted for 10% or more of total revenues were as
follows:
     
                                          1996       1995     1994
                                          ----       ----     ----
     Customer A                            27%       72%       89%
     Customer B                            18        --        --
     Customer C                            16        --        --
     Customer D                            15        --        --
     Customer E                            10        --        --
     
     At December 31, 1996, three customers' balances accounted for 40%, 26% 
and 11% of accounts receivable.  At December 31, 1995, one customer's balance 
accounted for 73% of accounts receivable.

8.   EMPLOYEE BENEFITS PLAN

     The Company maintains a 401(k) plan for employees who have completed 12
consecutive months of service and during that period have worked 1,000 hours. 
The Company makes matching contributions to the plan based on the amounts
contributed by eligible employees.  Company contributions to the plan totaled
$264,000, $223,000 and $105,000 for 1996, 1995 and 1994, respectively.


<PAGE>

9.   SUBSEQUENT EVENT

     On June 11, 1997, the Company entered into an Agreement and Plan of
Reorganization with Tetra Tech, Inc., a Delaware corporation (the "Agreement"). 
The Agreement provided for the merger of the Company, along with Whalen Service
Corps Inc., with Tetra Tech, Inc. for aggregate consideration of $52,456,000.
     
     The consideration consisted of 1,680,000 shares of Tetra Tech, Inc. common
stock with a $.01 par value ("Common Stock"), 1,231,840 shares of Tetra Tech,
Inc. Series A convertible preferred stock with a $.01 par value ("Series A
Stock") and $8,051,000 in cash. 
     
     Each share of Series A Stock will automatically be converted into one share
of Common Stock immediately upon the filing of an amendment to Tetra Tech,
Inc.'s Certificate of Incorporation which increases the number of authorized
shares of Common Stock to a number sufficient to permit the conversion of all
the outstanding shares of Series A Stock.
     
     As part of the Agreement, on the business day prior to the merger, the
Company distributed to the stockholder (i) cash in the amount of $4,138,000 and
(ii) accounts receivable having a net value of $18,456,000. 


                                    *  *  *  *  *



<PAGE>

                               WHALEN & COMPANY, INC.
                               UNAUDITED BALANCE SHEETS
                      AS OF MARCH 31, 1997 AND DECEMBER 31, 1996

(IN THOUSANDS, EXCEPT SHARE AMOUNTS)          MARCH 31, 1997   DECEMBER 31, 1996

                                      ASSETS

CURRENT ASSETS:
   Cash and equivalents                           $ 2,260           $ 3,126
   Accounts receivable, less allowance 
    for doubtful accounts of $2,020 for 
    each respective period                         29,595            24,941
   Prepaid expenses and other                         831               472
                                                 --------         ---------
     Total current assets                          32,686            28,539

PROPERTY AND EQUIPMENT, NET                         1,015               705

OTHER ASSETS                                          180               682
                                                 --------         ---------
TOTAL                                            $ 33,881         $  29,926
                                                 --------         ---------
                                                 --------         ---------

                    LIABILITIES AND STOCKHOLDER'S EQUITY 

CURRENT LIABILITIES:
   Accounts payable                              $  1,002         $   1,119
   Accrued employee benefits                        2,245             2,830
   Other accrued liabilities                          719               509
   Note payable to stockholder                      1,476             1,446
                                                 --------         ---------
      Total liabilities                             5,442             5,904
                                                 --------         ---------


STOCKHOLDER'S EQUITY: 
  Common stock, $1 par value; 150,000
    shares authorized; 
    100 shares issued and outstanding                  10                10
   Retained earnings                               28,429            24,012
                                                 --------         ---------

     Total stockholder's equity                    28,439            24,022
                                                 --------         ---------

TOTAL                                            $ 33,881         $  29,926
                                                 --------         ---------
                                                 --------         ---------

                      SEE NOTES TO FINANCIAL STATEMENTS


<PAGE>

                                WHALEN & COMPANY, INC. 
                            UNAUDITED STATEMENTS OF INCOME 
                  THREE MONTHS ENDED MARCH 31, 1997 AND MARCH 31, 1996 


                                       Three Months Ended    Three Months Ended
(In thousands)                           March 31, 1997        March 31, 1996 
                                       ------------------    ------------------

NET REVENUES: 
   Management fees                        $      13,821        $        8,993 
   Per-site fees                                    833                 3,501 
                                          -------------        --------------
     Total net revenues                          14,654                12,494 

FIELD OPERATING EXPENSES                          7,470                 5,312 
                                          -------------        --------------

OPERATING INCOME                                  7,184                 7,182 

GENERAL AND ADMINISTRATIVE EXPENSES               3,206                 2,035 
                                          -------------        --------------

INCOME FROM OPERATIONS                            3,978                 5,147 
                                          -------------        --------------

OTHER INCOME (EXPENSE), NET: 
   Interest income                                   47                    87 
   Interest expense                                 (36)                   (5)
   Other expense, net                              (149)                 (157)
                                          -------------        --------------
     Total other expense, net                      (138)                  (75)

INCOME BEFORE INCOME TAXES                        3,840                 5,072 

STATE INCOME TAXES                                    -                     -
                                          -------------        --------------

NET INCOME                                $       3,840        $        5,072 
                                          -------------        --------------
                                          -------------        --------------


                           See notes to financial statements 


<PAGE>

                                 WHALEN & COMPANY, INC. 
                          UNAUDITED STATEMENTS OF CASH FLOWS 
                 THREE MONTHS ENDED MARCH 31, 1997 AND MARCH 31, 1996 

<TABLE>
<CAPTION>
                                                       Three Months Ended   Three Months Ended
(In thousands)                                           March 31, 1997       March 31, 1996 
                                                       ------------------   ------------------
<S>                                                          <C>                <C>
CASH FLOWS FROM OPERATING ACTIVITIES: 
  Net Income                                                 $ 3,840            $ 5,072
  Reconciliation of net income to net cash provided by  
    operating activities: 
    Depreciation                                                 (96)                58
    Changes in assets and liabilities: 
      Accounts receivable                                     (4,654)              (570)
      Prepaid expenses and other                                (359)               (30)
      Other assets                                               502                  -
      Accounts payable                                          (117)              (770)
      Accrued employee benefits                                 (585)              (617)
      Other accrued liabilities                                  210                742 
                                                           ---------          ---------
        Net cash (used in) provided by operating activities   (1,259)             3,885
                                                           ---------          ---------

 CASH FLOWS FROM INVESTING ACTIVITIES: 
   Purchases of property and equipment                          (238)              (118)
   Disposal of property and equipment                             24                  -
                                                           ---------          ---------
        Net cash used in investing activities                   (214)              (118)
                                                           ---------          ---------

 CASH FLOWS FROM FINANCING ACTIVITIES: 
   Increase of note payable to stockholder                        30                  -
   Contribution by stockholder                                   577                  -
                                                           ---------          ---------
        Net cash provided by financing activities                607                  -
                                                           ---------          ---------

 NET CHANGE IN CASH AND EQUIVALENTS                             (866)             3,767

 CASH AND EQUIVALENTS, BEGINNING OF PERIOD                     3,126                783
                                                           ---------          ---------

 CASH AND EQUIVALENTS, END OF PERIOD                         $ 2,260            $ 4,550
                                                           ---------          ---------
                                                           ---------          ---------
 SUPPLEMENTAL DISCLOSURE OF CASH FLOW 
   INFORMATION: 

   Cash paid for interest                                    $    35            $     5
                                                           ---------          ---------
                                                           ---------          ---------
   Cash paid for income taxes                                $     -            $     -
                                                           ---------          ---------
                                                           ---------          ---------


                             See notes to financial statements
</TABLE>

<PAGE>

                                           
                                WHALEN & COMPANY, INC.
                     NOTES TO THE UNAUDITED FINANCIAL STATEMENTS
                     THREE MONTHS ENDED MARCH 31, 1997 AND 1996
                                           

1.   BASIS OF PRESENTATION

     The accompanying balance sheet as of March 31, 1997, the statements of 
income and the statements of cash flows for the three-month periods ended 
March 31, 1997 and 1996 are unaudited, and in the opinion of management
include all adjustments, which are of a normal recurring nature, necessary for
a fair presentation of the financial position and the results of operations
for the period presented.

     The financial statements should be read in conjunction with the audited 
financial statements and the notes thereto for the year ended December 31, 
1996 included in the Tetra Tech, Inc. Form 8-K/A filed August 25, 1997.

     The results of operations for the three-month period ended March 31, 
1997 are not necessarily indicative of the results to be expected for the 
fiscal year ending September 28, 1997.

2.   CURRENT ASSETS

     The Company considers all highly liquid investments purchased with a 
maturity of three months or less to be cash equivalents.  Cash equivalents 
totaled $1,900,000 and $2,200,000 at March 31, 1997 and 1996, respectively.

3.   RELATED PARTY TRANSACTIONS

     The sole stockholder of the Company advances the Company funds through 
notes payable that are used for current operating and other costs and are due 
upon demand and bear interest at a rate of 9%.  Total interest expense 
related to the stockholder note payable was $30,000 and $0 for the three months
ended March 31, 1997 and 1996, respectively.

4.   SUBSEQUENT EVENT

     On June 11, 1997, the Company entered into an Agreement and Plan of 
Reorganization with Tetra Tech, Inc., a Delaware corporation (the 
"Agreement"). The Agreement provided for the merger of the Company, along 
with Whalen Service Corps Inc., with Tetra Tech, Inc. for aggregate 
consideration of $52,456,000.

     The consideration consisted of 1,680,000 shares of Tetra Tech, Inc. 
common stock with a $.01 par value ("Common Stock"), 1,231,840 shares of 
Tetra Tech, Inc. Series A convertible preferred stock with a $.01 par value 
("Series A Stock") and $8,051,000 in cash.

<PAGE>

Each share of Series A Stock will automatically be converted into one share 
of common stock immediately upon the filing of an amendment to Tetra Tech, 
Inc.'s Certificate of Incorporation which will increase the number of 
authorized shares of Common Stock to a number sufficient to permit the 
conversion of all the outstanding shares of Series A Stock.  If an amendment 
to Tetra Tech, Inc.'s Certificate of Incorporation is not executed by 
December 10, 1997, the holders of the Series A Stock may put the Series A 
Stock to Tetra Tech, Inc. for cash at the average closing price of the 
Company's common stock on the five days ending one day prior to the exercise 
of the put.

     As part of the Agreement, on the business day prior to the merger, the 
Company distributed to the stockholder (i) cash in the amount of $4,138,000 
and (ii) accounts receivable having a net value of $18,456,000.
                                           


<PAGE>

                          TETRA TECH, INC. AND WHALEN & COMPANY, INC.
             Unaudited Pro Forma Condensed Consolidated Statement of Operations
                            For the Year Ended September 29, 1996

                             (In thousands except per share data)

<TABLE>
<CAPTION>
                                                        Historical (Note 1)           Pro forma (Note 2)   
                                                     --------------------------  --------------------------
                                                     Tetra Tech,    Whalen &           
                                                        Inc.      Company, Inc.  Adjustments   Consolidated 
                                                     -----------  -------------  -----------   ------------
<S>                                                  <C>             <C>           <C>           <C>
Gross Revenue. . . . . . . . . . . . . . . . . . . . $ 220,099       $ 56,556      $   -         $ 276,655 
  Subcontractor costs. . . . . . . . . . . . . . . .    59,062            -            -            59,062 
                                                     ---------       --------      -------       ---------
Net Revenue. . . . . . . . . . . . . . . . . . . . .   161,037         56,556          -           217,593 
                                                    
Cost of Net Revenue. . . . . . . . . . . . . . . . .   122,084         26,058        1,726         149,868 
                                                     ---------       --------      -------       ---------
Gross Profit . . . . . . . . . . . . . . . . . . . .    38,953         30,498       (1,726)         67,725 
                                                    
Selling, General and Adminstrative Expenses. . . . .    21,218         11,220        1,864          34,302 
                                                     ---------       --------      -------       ---------
Income From Operations . . . . . . . . . . . . . . .    17,735         19,278       (3,590)         33,423 
                                                    
Interest Expense . . . . . . . . . . . . . . . . . .     1,076             35          700           1,811 
Interest Income. . . . . . . . . . . . . . . . . . .       300             66          -               366 
Other Income (Expense), net. . . . . . . . . . . . .       -              (74)         -               (74)
                                                     ---------       --------      -------       ---------
Income Before Income Taxes . . . . . . . . . . . . .    16,959         19,235       (4,290)         31,904 
                                                    
Income Tax Expense . . . . . . . . . . . . . . . . .     6,854            385        5,892          13,131 
                                                    
Net Income . . . . . . . . . . . . . . . . . . . . . $  10,105         18,850     $(10,182)      $  18,773 
                                                     ---------       --------      -------       ---------
                                                     ---------       --------      -------       ---------
                                                    
Net Income Per Common Share (Note 3) . . . . . . . .      0.70                                        1.08
                                                     ---------                                   ---------
                                                     ---------                                   ---------
                                                    
Shares Used in Per Share Calculations (Note 3) . . .    14,452                                      17,364
                                                     ---------                                   ---------
                                                     ---------                                   ---------

      See accompanying notes to unaudited pro forma condensed consolidated financial statements.       

</TABLE>


<PAGE>

                 TETRA TECH, INC. AND WHALEN & COMPANY, INC.
    UNAUDITED PRO FORMA CONDENSED CONSOLIDATED STATEMENT OF OPERATIONS
                   FOR THE NINE MONTHS ENDED JUNE 29, 1997

                     (IN THOUSANDS EXCEPT PER SHARE DATA)
<TABLE>
<CAPTION>
                                                      Historical (Note 1)          Pro Forma (Note 2)
                                                   --------------------------  -------------------------
                                                    Tetra Tech,   Whalen &
                                                       Inc.     Company, Inc.  Adjustments  Consolidated
                                                    ---------   -------------  -----------  ------------
<S>                                                 <C>           <C>            <C>          <C>
Gross Revenue. . . . . . . . . . . . . . . . . .    $ 171,406     $ 39,624       $    -       $ 211,030
  Subcontractor costs. . . . . . . . . . . . . .       38,447          -              -          38,447
                                                    ---------   ----------       ---------    ---------
Net Revenue. . . . . . . . . . . . . . . . . . .      132,959       39,624            -         172,583

Cost of Net Revenue. . . . . . . . . . . . . . .      100,077       26,519          (3,542)     123,054
                                                    ---------   ----------       ---------    ---------

Gross Profit . . . . . . . . . . . . . . . . . .       32,882       13,105           3,542       49,529

Selling, General and Adminstrative Expenses. . .       17,390       12,365           (960)       28,795
                                                    ---------   ----------       ---------    ---------
Income From Operations . . . . . . . . . . . . .       15,492          740           4,502       20,734

Interest Expense . . . . . . . . . . . . . . . .          127          -               525          652
Interest Income. . . . . . . . . . . . . . . . .          201          -               -            201
Other Income (Expense) . . . . . . . . . . . . .          -             27             -             27
                                                    ---------   ----------       ---------    ---------

Income Before Income Taxes . . . . . . . . . . .       15,566          767           3,977       20,310

Income Tax Expense . . . . . . . . . . . . . . .        6,464          -             1,992        8,456

Net Income . . . . . . . . . . . . . . . . . . .    $   9,102   $      767       $   1,985    $  11,854
                                                    ---------   ----------       ---------    ---------
                                                    ---------   ----------       ---------    ---------
Net Income Per Common Share (Note 3) . . . . . .         0.61                                      0.67
                                                    ---------   ----------       ---------    ---------
                                                    ---------   ----------       ---------    ---------
Shares Used in Per Share Calculations (Note 3) .       14,918                                    17,784
                                                    ---------   ----------       ---------    ---------
                                                    ---------   ----------       ---------    ---------

       See accompanying notes to unaudited pro forma condensed consolidated financial statements.

</TABLE>

<PAGE>

                    TETRA TECH, INC. AND WHALEN & COMPANY, INC.
      NOTES TO UNAUDITED PRO FORMA CONDENSED CONSOLIDATED FINANCIAL STATEMENTS
   FOR THE YEAR ENDED SEPTEMBER 29, 1996 AND THE NINE MONTHS ENDED JUNE 29, 1997
                                           
                                    (In thousands)
                                           
1.   PERIODS PRESENTED

     On June 11, 1997, Tetra Tech, Inc. ("Tetra Tech") purchased 100% of the 
capital stock of Whalen & Company, Inc. and Whalen Service Corps Inc. 
(collectively, "WAC") for approximately $43,070 consisting of cash and Tetra 
Tech common and preferred stock. The common and preferred stock was issued in 
a private placement and had a combined value of approximately $33,304. Tetra 
Tech's stock was valued based upon the extended restriction period and 
economic factors specific to Tetra Tech's circumstances which resulted in a 
fair valuation approximately 28% below the then prevailing market price.

     The Unaudited Pro Forma Condensed Consolidated Statements of Operations 
have been prepared by combining the separate historical financial statements 
of Tetra Tech and WAC for the year ended September 29, 1996 and the nine 
months ended June 29, 1997.  The historical statements of operations for WAC 
included in the Unaudited Pro Forma Condensed Consolidated Statement of 
Operations for the year ended September 29, 1996 represent the results of 
operations for the year ended December 31, 1996.  The historical statement of 
operations for WAC included in the Unaudited Pro Forma Condensed Consolidated 
Statement of Operations for the nine months ended June 29, 1997 represents 
the results of operations for the period October 1, 1996 through May 31, 
1997.  The Statement of Operations for the period June 1, 1997 through June 
29, 1997 for WAC is reflected in the historical Condensed Consolidated 
Statement of Operations of Tetra Tech for the period ended June 29, 1997.

     An Unaudited Pro Forma Condensed Consolidated Balance Sheet has not been 
prepared as WAC is included in the Unaudited Condensed Consolidated Balance 
Sheet at June 29, 1997 for Tetra Tech, Inc. as filed in Tetra Tech's 
Quarterly Report on Form 10-Q for the period ended June 29, 1997.

2.   PRO FORMA ADJUSTMENTS RELATED TO THE ACQUISITION

     The adjustments to Cost of Net Revenue of $1,726 and $3,542 and the 
adjustments to Selling, General and Administrative Expenses of $547 and 
$1,947 for the year ended September 29, 1996 and the nine months ended June 
29, 1997, respectively, represent salary and bonus expense adjustments for 
WAC employees and WAC's principal stockholder.  Prior to the acquisition, WAC 
was an S corporation and made distributions to its principal stockholder in 
lieu of increased salary and bonus.  Immediately prior to the acquisition, 
WAC declared a one-time bonus of approximately $5,000 for certain employees 
as a result of terms negotiated in the acquisition.  The pro forma 
adjustments reflect the net effect of the bonus that would have been 
<PAGE>

recognized under Tetra Tech's established bonus policy, net of the bonuses 
declared by WAC, and the terms of the Employment Agreement between Tetra Tech 
and the principal stockholder for each of the periods provided.

     The adjustments to Selling, General and Administrative Expenses of 
$1,317 and $987 for the year ended September 29, 1996 and the nine months 
ended June 29, 1997, respectively, represent the amortization of intangible 
assets resulting from the acquisition.  The intangible assets are amortized 
on a straight-line basis over thirty years.

     The adjustments to Interest Expense of $700 and $263 for the year ended 
September 29, 1996 and the nine months ended June 29, 1997, respectively, 
represent expense on borrowings under Tetra Tech's existing credit 
facility that relate to the acquisition of WAC.  Such adjustments are based 
upon the average interest rates and terms of the credit facility for the 
periods presented.

     The adjustments to Income Tax Expense of $4,239 and $1,992 for the year 
ended September 29, 1996 and the nine months ended June 29, 1997, 
respectively, represent the income tax effect of the pro forma adjustments 
(since WAC was, as indicated above, an S corporation taxpayer) and an 
adjustment to reflect the consolidated effective income tax rate.

3.  EARNINGS PER SHARE

     The adjustments to Shares Used in Per Share Calculations of 2,912 shares 
and 2,866 shares for the year ended September 29, 1996 and the nine months 
ended June 29, 1997, respectively, represent the number of additional shares 
that would have been outstanding had the shares issued in the acquisition 
been outstanding for the entire periods reflected.

     The unaudited pro forma consolidated Net Income Per Common Share was 
computed by dividing the pro forma consolidated Net Income by the pro forma 
weighted average number of common shares and common stock equivalents 
outstanding for each period.
<PAGE>

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

     Date:  September 18, 1997


                                       TETRA TECH, INC.


                                       By:     /s/ JAMES M. JASKA   
                                               ---------------------
                                               James M. Jaska
                                               Vice President and
                                               Chief Financial Officer




<PAGE>
                                                              EXHIBIT 23.1






INDEPENDENT AUDITORS' CONSENT

We consent to the incorporation by reference in Registration Statement Nos. 
33-46240, 33-47533, 33-80606, and 33-94706 on Form S-8 and Registration 
Statement No. 333-26199 on Form S-3 of Tetra Tech, Inc. of our report dated 
August 8, 1997 appearing in this Form 8-K/A.


/s/ DELOITTE & TOUCHE LLP

Los Angeles, California
September 18, 1997





<PAGE>

                                                                 EXHIBIT 23.2


                  CONSENT OF INDEPENDENT PUBLIC ACCOUNTANTS'


As independent public accountants, we hereby consent to the incorporation by 
reference of our report dated November 1, 1996, included in this Form 8-K/A, 
into Tetra Tech, Inc.'s previously filed Registration Statement File Nos. 
33-46240, 33-47533, 33-80606, 33-94706 and 333-26199.


ARTHUR ANDERSEN LLP


San Francisco, California
 September 18, 1997


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