Document:

<PAGE>

                                 EXHIBIT 10.3.2

Amendment Nos. 2 and 3 to Third Amended and Restated Revolving Credit Agreement,
by and among TRC Companies, Inc. and its subsidiaries and Fleet National Bank,
dated March 14, 2000 and May 19, 2000, respectively.

                                       14
<PAGE>

                                 AMENDMENT NO. 2
                                       TO
                           REVOLVING CREDIT AGREEMENT

         Amendment No. 2 (the "Amendment"), dated as of March 14, 2000, among
TRC Companies, Inc., a Delaware corporation ("TRC"), its Subsidiaries
(collectively with TRC, the "Borrowers") and Fleet National Bank (f/k/a
BankBoston, N.A.) (the "Bank"). Capitalized terms used herein unless otherwise
defined shall have the respective meanings set forth in the Credit Agreement.

         WHEREAS, certain of the Borrowers and the Bank are parties to that
certain Third Amended and Restated Revolving Credit Agreement dated as of July
10, 1998 (as amended and in effect from time to time, the "Credit Agreement");
and

         WHEREAS, the Borrowers have requested, and the Bank has agreed upon the
terms and conditions described herein, to make certain amendments to the Credit
Agreement;

         NOW, THEREFORE, in consideration of the foregoing premises, the parties
hereby agree as follows:

         SECTION 1. GLOBAL AMENDMENT TO LOAN DOCUMENTS. All references in the
Loan Documents to the "Bank" or to "BankBoston, N.A." shall be deemed to refer
to "Fleet National Bank (f/k/a BankBoston, N.A.)".

         SECTION 2. AMENDMENTS TO CREDIT AGREEMENT. The Credit Agreement is
hereby amended as follows:

         SECTION 2.1. AMENDMENT TO SECTION 1 OF THE CREDIT AGREEMENT.

         (a) The table set forth in the definition of "APPLICABLE LETTER OF
CREDIT RATE" is amended and restated in its entirety to read as follows:

<TABLE>
<CAPTION>

------------------------------------------------------ ----------------------------------------------
                                                                       APPLICABLE RATE FOR
                   LEVERAGE RATIO                                       LETTERS OF CREDIT
------------------------------------------------------ ----------------------------------------------
<S>                                                    <C>
------------------------------------------------------ ----------------------------------------------
Less than 1.00:1                                                              1.50%
------------------------------------------------------ ----------------------------------------------
Greater than or equal to 1.00:1 but less than 2.00:1                          1.75%
------------------------------------------------------ ----------------------------------------------
Greater than or equal to 2.00:1                                               2.00%
------------------------------------------------------ ----------------------------------------------
</TABLE>

                                       15

<PAGE>

         (b) The table set forth in the definition of "APPLICABLE RATE" is
amended and restated in its entirety to read as follows:

<TABLE>
<CAPTION>

  ------------------------------------- --------------------------- ----------------------------------------
                                           APPLICABLE RATE FOR                APPLICABLE RATE FOR
             LEVERAGE RATIO                  BASE RATE LOANS                   EURODOLLAR LOANS
  ------------------------------------- --------------------------- ----------------------------------------
  <S>                                   <C>                         <C>
  ------------------------------------- --------------------------- ----------------------------------------
  Less than 1.00:1                      Base Rate                   Eurodollar Rate PLUS 1.50%
  ------------------------------------- --------------------------- ----------------------------------------
  Greater than or equal to 1.00:1 but   Base Rate                   Eurodollar Rate PLUS 1.75%
  less than 2.00:1
  ------------------------------------- --------------------------- ----------------------------------------
  Greater than or equal to 2.00:1       Base Rate PLUS 0.25%        Eurodollar Rate PLUS 2.00%
  ------------------------------------- --------------------------- ----------------------------------------
</TABLE>

         (c) The definition of "BALANCE SHEET DATE" is amended and restated in
its entirety to read as follows:

                  BALANCE SHEET DATE.  June 30, 1999.

         (d) The definition of "BANK'S HEAD OFFICE" is amended and restated in
its entirety to read as follows:

                  BANK'S HEAD OFFICE. The Bank's head office located at 111
Westminister Street, Providence, Rhode Island 02903.

         (e) The definition of "BASE RATE" is amended and restated in its
entirety to read as follows:

                  BASE RATE. The higher of (i) the variable annual rate of
interest so designated from time to time by the Bank at the Bank's Head Office,
as its "prime rate," such rate being a reference rate and not necessarily
representing the lowest or best rate being charged to any customer, and (ii)
one-half of one percent (1/2%) above the Federal Funds Effective Rate. For the
purposes of this definition, "Federal Funds Effective Rate" shall mean for any
day, the rate per annum equal to the weighted average of the rates on overnight
federal funds transactions with members of the Federal Reserve System arranged
by federal funds brokers, as published for such day (or, if such day is not a
Business Day, for the next preceding Business Day) by the Federal Reserve Bank
of New York, or, if such rate is not so published for any day that is a Business
Day, the average of the quotations for such day on such transactions received by
the Bank from three funds brokers of recognized standing selected by the Bank.
Changes in the Base Rate resulting from any changes in the Bank's "prime rate"
shall take place immediately without notice or demand of any kind.

         (f) The definitions of "COLLATERAL VALUE RATIO" and "ELIGIBLE
RECEIVABLES" are deleted in their entirety.

         (g) The definition of "COMMITMENT" is amended by deleting the number
"$15,000,000" and substituting in lieu thereof the number "$20,000,000".

                                       16
<PAGE>

         (h) The definition of "DISTRIBUTION" is amended and restated in its
entirety to read as follows:

                  DISTRIBUTION. The declaration or payment of any dividend on or
in respect of any shares of any class of capital stock or other equity interests
of any Borrower, other than dividends payable solely in shares of common stock
or other equity interests of a Borrower; or the purchase, redemption, or other
retirement of any shares of any class of capital stock or other equity interests
of any Borrower, directly or indirectly through a Subsidiary or otherwise; the
return of capital by any Borrower to its shareholders or other equityholders as
such; any other distribution on or in respect of any shares of any class of
capital stock or other equity interests of any Borrower.

         (i) The definition of "LEVERAGE RATIO" is amended and restated in its
entirety to read as follows:

                  LEVERAGE RATIO. For any period, the ratio of (a) Consolidated
Funded Debt as of the end of such period to (b) Consolidated EBITDA for the
period of four consecutive fiscal quarters then ended.

         (j) The definition of "MATURITY DATE" is amended and restated in its
entirety to read as follows:

                  MATURITY DATE.  March 13, 2003.

         (k) The definition of "NOTE" is amended and restated in its entirety to
read as follows:

                  NOTE. The fourth amended and restated promissory note of the
Borrowers in favor of the Bank evidencing the Loans dated as of the date of the
Second Amendment, in substantially the form of EXHIBIT A hereto.

         (l) The definition of "OBLIGATIONS" is amended and restated in its
entirety to read as follows:

                  OBLIGATIONS. All indebtedness, obligations and liabilities of
the Borrowers, individually or collectively, to the Bank, existing on the date
of this Agreement or arising thereafter, direct or indirect, joint or several,
absolute or contingent, matured or unmatured, liquidated or unliquidated,
secured or unsecured, arising by contract, operation of law or otherwise,
arising or incurred under this Agreement, a Letter of Credit Agreement or the
Chilean Guaranty or in respect of Loans made and the Note or other instruments
at any time evidencing any thereof and any other obligations owing at any time
to the Bank.

         (m) The following new definitions are inserted in ss.1 in the
appropriate place in the alphabetical sequence thereof:

                  SECOND AMENDMENT.  The Amendment No. 2 to Revolving Credit
Agreement dated as of March 14, 2000, among the Borrowers and the Bank.

                  CHILEAN GUARANTY. The Limited Guaranty dated as of July 29,
1999 made by TRC in favor of the Bank pursuant to which TRC guaranties the
payment and performance of the obligations of TRC Ingenieria Ambiental LTDA to
the Bank.

                                       17
<PAGE>

                  CONSOLIDATED CURRENT ASSETS. All assets of the Borrowers, on a
consolidated basis, which may properly be classified as current assets in
accordance with Generally Accepted Accounting Principles.

                  CONSOLIDATED NET WORTH. The excess of Consolidated Total
Assets over Consolidated Total Liabilities, determined in accordance with
Generally Accepted Accounting Principles.

                  CONSOLIDATED TOTAL ASSETS. All assets of the Borrowers, on a
consolidated basis, determined in accordance with Generally Accepted Accounting
Principles.

                  CONSOLIDATED TOTAL LIABILITIES.  All liabilities of the
Borrowers, on a consolidated basis, determined in accordance with Generally
Accepted Accounting Principles.

         SECTION 2.2. AMENDMENT TO SECTION 2 OF THE CREDIT AGREEMENT.

         (a) Section 2.2(f) of the Credit Agreement is amended by deleting the
word "The" as the first word of such paragraph and substituting in place thereof
the following phrase: "In addition to the Banks' customary issuance and
administrative fees, the".

         (b) Section 2.4 of the Credit Agreement is amended by inserting the
words "of $500,000 in excess" after the words "an integral multiple" appearing
in the first sentence thereof.

         SECTION 2.3. AMENDMENT TO SECTION 4 OF THE CREDIT AGREEMENT. (a)
Section 4.17 of the Credit Agreement is amended by deleting the phrase "to pay a
portion of the Subordinated Debt" and substituting in place thereof the phrase
"for capital expenditures".

         (b) Section 4.1(b) is deleted in its entirety and the following
subsection (b) is substituted in its place:

         "(b) AUTHORIZATION. The execution, delivery and performance of the Loan
Documents and the transactions contemplated hereby and thereby (i) are within
the corporate or other organizational authority of each of the Borrowers and
their Subsidiaries, (ii) have been duly authorized by all necessary corporate or
other organizational proceedings, (iii) do not conflict with or result in any
material breach or contravention of any provision of law, statute, rule or
regulation to which any of the Borrowers or any of their Subsidiaries is subject
or any judgment, order, writ, injunction, license or permit applicable to any of
the Borrowers or any of their Subsidiaries so as to materially adversely affect
the assets, business or any activity of any of the Borrowers or any of their
Subsidiaries, and (iv) do not conflict with any provision of the corporate
charter or bylaws or any other internal governance document of any of the
Borrowers or any

                                       18
<PAGE>

of their Subsidiaries or any agreement or other instrument binding upon any of
the Borrowers or any of their Subsidiaries."

         SECTION 2.4. AMENDMENT TO SECTION 5 OF THE CREDIT AGREEMENT.

         Section 5.2(e) is amended and restated in its entirety to read:

         (e) when requested by the Bank, within 20 days after the end of each
calendar month, an accounts receivable aging summary as of the end of each
month;

         SECTION 2.5. AMENDMENTS TO SECTION 6 OF THE CREDIT AGREEMENT.

         (a) Section 6.4 of the Credit Agreement is amended and restated in its
entirety to read as follows:

         SECTION 6.4. MERGER, CONSOLIDATION, AND ACQUISITIONS. No Borrower will
become a party to any merger, consolidation, or acquisition except (a) for the
merger or consolidation of a Borrower with another Borrower or (b) where (i)
such Borrower is the surviving corporation of a merger; (ii) such merger,
consolidation, or acquisition is of a company in the environmental consulting,
engineering or related field; (iii) the Bank has been provided with a
certificate demonstrating that the Borrowers are in current compliance with and,
after giving effect to the proposed acquisition (including any borrowings made
or to be made in connection therewith), will continue to be in compliance with,
all of the covenants in this ss.6; (iv) all of the assets to be acquired shall
be owned by an existing or newly created Subsidiary of TRC which is a Borrower,
or, in the case of a stock acquisition, the acquired company shall become or
shall be merged with a wholly-owned Subsidiary of TRC that is a Borrower, and
each newly created Subsidiary shall grant to the Bank a security interest in its
Accounts Receivable to secure its Obligations and shall otherwise comply with
the provisions of ss.5.13 hereof; (v) the required majority of the Board of
Directors of the target company incumbent at the time such acquisition, merger
or consolidation is proposed has acquiesced either voluntarily or by order of a
court of competent jurisdiction, or the transaction is otherwise deemed in the
reasonable judgment of the Bank to be a "friendly" acquisition; (vi) the total
consideration for such merger, consolidation or acquisition (including cash and
assumed Indebtedness) shall not exceed $5,000,000 for any merger, consolidation
or acquisition or series thereof; and (vii) the Borrowers shall have delivered
to the Bank, in form and substance satisfactory to the Bank, information, on the
transaction to be completed including, without limitation, pro forma covenant
compliance calculations, historical financial statements and due diligence
summaries; and PROVIDED FURTHER that both immediately before and after any such
merger, consolidation or acquisition, no Defaults or Events of Default shall
have occurred or be continuing.

                                       19
<PAGE>

         (b) Section 6.7 of the Credit Agreement is amended and restated in its
entirety to read as follows:

         SECTION 6.7. CURRENT ASSETS TO TOTAL LIABILITIES. The Borrowers will
not permit at any time the ratio of Consolidated Current Assets to Consolidated
Total Liabilities to be less than 1.25:1.

         (c) Section 6.9 of the Credit Agreement is amended by deleting the
ratio "3.5:1" and substituting in place thereof the ratio "3.0:1".

         (d) Section 6 of the Credit Agreement is further amended by inserting
the following new sections at the end thereof:

                  SECTION 6.13. NET WORTH. The Borrowers will not permit
Consolidated Net Worth at any time to be less than (a) $44,000,000 plus (b) the
sum of (i) 75% of quarterly positive net income earned after December 31, 1999
on a cumulative basis and (ii) 100% of the value of all property received by the
Borrowers in exchange for the issuance of new equity securities (or the sale of
treasury shares) of any of the Borrowers.

                  SECTION 6.14. RESTRICTIONS ON NEGATIVE PLEDGES. The Borrower
will not enter into any agreement (excluding this Credit Agreement and the other
Loan Documents) prohibiting the creation or assumption of any lien upon its
properties, revenues or assets, whether now owned or hereafter acquired.

         SECTION 2.6. AMENDMENT TO SCHEDULE 1. SCHEDULE 1 to the Credit
Agreement is amended and replaced in its entirety by the SCHEDULE 1 attached
hereto.

         SECTION 3. AMENDMENT FEE. The Borrowers jointly and severally agree to
pay to the Bank, in consideration for making the amendments contained herein, an
amendment fee (the "Amendment Fee") of $60,000, such fee to be payable in three
equal installments of $20,000, with the first such installment due and payable
on the date hereof and the remaining two installments due and payable on July 1,
2000 and October 1, 2000, respectively.

         SECTION 4. CONDITIONS TO EFFECTIVENESS. The effectiveness of this
Amendment shall be conditioned upon the satisfaction of the following conditions
precedent:

         SECTION 4.1. DELIVERY OF DOCUMENTS. The Borrowers shall have delivered
to the Bank, contemporaneously with the execution hereof, the following, in form
and substance satisfactory to the Bank:

         (a) this Amendment signed by the Borrowers;

         (b) a Fourth Amended and Restated Note signed by the Borrowers and
issued to the Bank in the amount of $20,000,000;

         (c) certificates of an appropriate officer of each of the Borrowers,
dated as of the date hereof, as to (i) the charter documents and by-laws, each
as amended, of each of the Borrowers, (ii) the corporate actions taken by each
of the Borrowers authorizing the execution, delivery, and performance hereof,
and (iii) the names, titles, incumbency, and specimen signatures of the officers
of each of the Borrowers authorized to sign this Amendment and the Note on
behalf of each of the Borrowers; and

                                       20
<PAGE>

         (d) a favorable written legal opinion addressed to the Bank, dated as
of the date hereof, from counsel to the Borrowers, with respect to such matters
as to the Borrowers and the Loan Documents as the Bank may reasonably request,
including (without limitation) opinions as to the corporate authority of each of
the Borrowers to execute, deliver, and perform this Amendment, the Note, and the
other documents contemplated hereby, and the enforceability thereof;.

         SECTION 4.2. PAYMENT OF FEES. The Borrowers shall have paid the portion
of the Amendment Fee due and payable on the date hereof and the legal fees of
Bank's counsel.

         SECTION 4.3. LEGALITY OF TRANSACTION. No change in applicable law shall
have occurred as a consequence of which it shall have become and continue to be
unlawful on the date this Amendment is to become effective (a) for the Bank to
perform any of its obligations under any of the Loan Documents or (b) for the
Borrowers to perform any of their agreements or obligations under any of the
Loan Documents.

         SECTION 4.4. PERFORMANCE. Each Borrower shall have duly and properly
performed, complied with and observed in all material respects its covenants,
agreements and obligations contained in the Loan Documents required to be
performed, complied with or observed by it on or prior to the date this
Amendment is to become effective. No event shall have occurred on or prior to
the date this Amendment is to become effective and be continuing, and no
condition shall exist on the date this Amendment is to become effective which
constitutes a Default or Event of Default under any of the Loan Documents.

         SECTION 4.5. PROCEEDINGS AND DOCUMENTS. All corporate, governmental and
other proceedings in connection with the transactions contemplated by this
Amendment and all instruments and documents incidental thereto shall be in the
form and substance reasonably satisfactory to the Bank and the Bank shall have
received all such counterpart originals or certified or other copies of all such
instruments and documents as the Bank shall have reasonably requested.

         SECTION 5. AFFIRMATION AND ACKNOWLEDGMENT OF THE BORROWERS. Each
Borrower hereby ratifies and confirms all of its Obligations to the Bank, and
hereby affirms its absolute and unconditional promise to pay to the Bank the
Loans, the Reimbursement Obligations, and all other amounts due under the Credit
Agreement as amended hereby. Each Borrower hereby confirms that the Obligations
are and remain secured pursuant to the Security Documents and pursuant to all
other instruments and documents executed and delivered by the Borrowers as
security for the Obligations. TRC hereby acknowledges and agrees that its
obligations in respect of the Chilean Guaranty constitute Obligations hereunder
and are secured pursuant to the Security Documents to which TRC is a party and
all other instruments and documents executed and delivered by TRC as security
for the Obligations.

                                       21
<PAGE>

         SECTION 6. REPRESENTATIONS AND WARRANTIES. Each of the Borrowers hereby
represents and warrants to the Banks as follows:

         (a) The representations and warranties of the Borrowers contained in
the Credit Agreement, as amended hereby, were true and correct in all material
respects when made and continue to be true and correct in all material respects
on the date hereof, except, in each case to the extent of changes resulting from
transactions contemplated or permitted by the Loan Documents and this Amendment
and changes occurring in the ordinary course of business which singly or in the
aggregate are not materially adverse, and to the extent that such
representations and warranties relate expressly to an earlier date.

         (b) The execution, delivery and performance by the Borrowers of this
Amendment and the consummation of the transactions contemplated hereby; (i) are
within the corporate powers of each Borrower and have been duly authorized by
all necessary corporate action on the part of such Borrower, (ii) do not require
any approval, consent of, or filing with, any governmental agency or authority,
or any other person, association or entity, which bears on the validity of this
Amendment and which is required by law or the regulation or rule of any agency
or authority, or other person, association or entity, (iii) do not violate any
provisions of any order, writ, judgment, injunction, decree, determination or
award presently in effect in which any Borrower is named, or any provision of
the charter documents or by-laws of such Borrower, (iv) do not result in any
breach of or constitute a default under any agreement or instrument to which any
Borrower is a party or to which it or any of its properties are bound, including
without limitation any indenture, loan or credit agreement, lease, debt
instrument or mortgage, except for such breaches and defaults which would not
have a material adverse effect on any Borrower and its subsidiaries taken as a
whole, and (v) do not result in or require the creation or imposition of any
mortgage, deed of trust, pledge or encumbrance of any nature upon any of the
assets or properties of any Borrower.

         (c) This Amendment, the Credit Agreement as amended hereby, and the
other Loan Documents constitute the legal, valid and binding obligations of the
Borrowers, enforceable against each Borrower in accordance with their respective
terms, provided that (i) enforcement may be limited by applicable bankruptcy,
insolvency, reorganization, moratorium or similar laws of general application
affecting the rights and remedies of creditors, and (ii) enforcement may be
subject to general principles of equity, and the availability of the remedies of
specific performance and injunctive relief may be subject to the discretion of
the court before which any proceeding for such remedies may be brought.

         (d) No Default or Event of Default under any of the Loan Documents is
existing as of the date hereof.

         (e) SCHEDULE 1 is a complete and accurate list of all Subsidiaries.

                                       22
<PAGE>

         SECTION 7. NO OTHER AMENDMENTS. Except as expressly provided in this
Amendment, all of the terms and conditions of the Credit Agreement, the Note and
the other Loan Documents shall remain in full force and effect.

         SECTION 8. EXECUTION IN COUNTERPARTS. This Amendment may be executed in
any number of counterparts and by each party on a separate counterpart, each of
which when so executed and delivered shall be an original, but all of which
together shall constitute one instrument. In proving this Amendment, it shall
not be necessary to produce or account for more than one such counterpart signed
by the party against whom enforcement is sought.

                  [REMAINDER OF PAGE INTENTIONALLY LEFT BLANK]

                                       23
<PAGE>

         IN WITNESS WHEREOF, the undersigned have duly executed this Amendment
under seal as of the date first set forth above.

                                       TRC COMPANIES, INC.

                                       By: /s/ HAROLD C. ELSTON, JR.
                                               ---------------------
                                               Harold C. Elston, Jr.

                                       Title:  Senior Vice President and
                                               Chief Financial Officer

                                       TRC ENVIRONMENTAL CORPORATION

                                       By: /s/ HAROLD C. ELSTON, JR.
                                               ---------------------
                                               Harold C. Elston, Jr.

                                       Title:  Vice President and Treasurer

                                       TRC ENGINEERS, INC.

                                       By: /s/ HAROLD C. ELSTON, JR.
                                               ---------------------
                                               Harold C. Elston, Jr.

                                       Title:  Vice President and Treasurer

                                       ENVIRONMENTAL SOLUTIONS, INC.

                                       By: /s/ HAROLD C. ELSTON, JR.
                                               ---------------------
                                               Harold C. Elston, Jr.

                                       Title:  Assistant Secretary and
                                               Assistant Treasurer

                                       TRC MARIAH ASSOCIATES, INC.

                                       By: /s/ HAROLD C. ELSTON, JR.
                                               ---------------------
                                               Harold C. Elston, Jr.

                                       Title:  Vice President and Treasurer

                                       TRC GARROW ASSOCIATES, INC.

                                       By: /s/ HAROLD C. ELSTON, JR.
                                               ---------------------
                                               Harold C. Elston, Jr.

                                       Title:  Treasurer

                                       24
<PAGE>

                                       ALTON GEOSCIENCE, INC.

                                       By: /s/ HAROLD C. ELSTON, JR.
                                               ---------------------
                                               Harold C. Elston, Jr.

                                       Title:  Assistant Treasurer

                                       VECTRE CORPORATION

                                       By: /s/ HAROLD C. ELSTON, JR.
                                               ---------------------
                                               Harold C. Elston, Jr.

                                       Title:  Treasurer

                                       HUNTER ASSOCIATES TEXAS, LTD.

                                       By: /s/ HAROLD C. ELSTON, JR.
                                               ---------------------
                                               Harold C. Elston, Jr.

                                       Title:  Vice President

                                       FLEET NATIONAL BANK
                                       (f/k/a BankBoston, N.A.)

                                       By: /s/ MICHAEL NATOLA
                                               ---------------------
                                               Michael Natola

                                       Title:  Vice President

                                       25
<PAGE>

                                 AMENDMENT NO. 3
                                       TO
                           REVOLVING CREDIT AGREEMENT

         Amendment No. 3 (the "Amendment"), dated as of May 19, 2000, among TRC
Companies, Inc., a Delaware corporation ("TRC"), its Subsidiaries (collectively
with TRC, the "Borrowers") and Fleet National Bank (f/k/a BankBoston, N.A.) (the
"Bank"). Capitalized terms used herein unless otherwise defined shall have the
respective meanings set forth in the Credit Agreement.

         WHEREAS, the Borrowers and the Bank are parties to that certain Third
Amended and Restated Revolving Credit Agreement dated as of July 10, 1998 (as
amended and in effect from time to time, the "Credit Agreement"); and

         WHEREAS, the Borrowers have requested, and the Bank has agreed upon the
terms and conditions described herein, to make certain amendments to the Credit
Agreement;

         NOW, THEREFORE, in consideration of the foregoing premises, the parties
hereby agree as follows:

         SECTION 1. AMENDMENT TO CREDIT AGREEMENT. Section 1.1. of the Credit
Agreement is hereby amended as follows:

         (a) The definition of "COMMITMENT" is amended by deleting the number
"$20,000,000" and substituting in lieu thereof the number "$25,000,000".

         (b) The definition of "NOTE" is amended and restated in its entirety to
read as follows:

                  NOTE. The fifth amended and restated promissory note of the
Borrowers in favor of the Bank evidencing the Loans dated as of the date of the
Third Amendment, in substantially the form of EXHIBIT A hereto.

         (c) The following new definition is inserted in ss.1 in the appropriate
place in the alphabetical sequence thereof:

                  THIRD AMENDMENT. The Amendment No. 3 to Revolving Credit
Agreement dated as of May 19, 2000, among the Borrowers and the Bank.

         SECTION 2. AMENDMEnT FEe. The Borrowers jointly and severally agree to
pay to the Bank, in consideration for making the amendments contained herein, an
amendment fee (the "Amendment Fee") of $15,000, such fee to be due and payable
on the date hereof. The payment of the Amendment Fee hereunder does not affect
in any way the Borrowers' joint and several obligations to pay the remaining
$20,000 installments of the Amendment Fee under the Second Amendment which are
due and payable on July 1, 2000 and October 1, 2000, respectively.

                                       26
<PAGE>

         SECTION 3. CONDITIONS TO EFFECTIVENESS. The effectiveness of this
Amendment shall be conditioned upon the satisfaction of the following conditions
precedent:

         SECTION 3.1. DELIVERY OF DOCUMENTS. The Borrowers shall have delivered
to the Bank, contemporaneously with the execution hereof, the following, in form
and substance satisfactory to the Bank:

         (a) this Amendment signed by the Borrowers;

         (b) a Fifth Amended and Restated Note signed by the Borrowers and
issued to the Bank in the amount of $25,000,000;

         (c) certificates of an appropriate officer of each of the Borrowers,
dated as of the date hereof, as to (i) the charter documents and by-laws, each
as amended, of each of the Borrowers, (ii) the corporate actions taken by each
of the Borrowers authorizing the execution, delivery, and performance hereof,
and (iii) the names, titles, incumbency, and specimen signatures of the officers
of each of the Borrowers authorized to sign this Amendment and the Note on
behalf of each of the Borrowers; and

         (d) a favorable written legal opinion addressed to the Bank, dated as
of the date hereof, from counsel to the Borrowers, with respect to such matters
as to the Borrowers and the Loan Documents as the Bank may reasonably request,
including (without limitation) opinions as to the corporate authority of each of
the Borrowers to execute, deliver, and perform this Amendment, the Note, and the
other documents contemplated hereby, and the enforceability thereof;.

         SECTION 3.2. PAYMENT OF FEES. The Borrowers shall have paid the
Amendment Fee and the legal fees of Bank's counsel.

         SECTION 3.3. LEGALITY OF TRANSACTION. No change in applicable law shall
have occurred as a consequence of which it shall have become and continue to be
unlawful on the date this Amendment is to become effective (a) for the Bank to
perform any of its obligations under any of the Loan Documents or (b) for the
Borrowers to perform any of their agreements or obligations under any of the
Loan Documents.

         SECTION 3.4. PERFORMANCE. Each Borrower shall have duly and properly
performed, complied with and observed in all material respects its covenants,
agreements and obligations contained in the Loan Documents required to be
performed, complied with or observed by it on or prior to the date this
Amendment is to become effective. No event shall have occurred on or prior to
the date this Amendment is to become effective and be continuing, and no
condition shall exist on the date this Amendment is to become effective which
constitutes a Default or Event of Default under any of the Loan Documents.

                                       27
<PAGE>

         SECTION 3.5. PROCEEDINGS AND DOCUMENTS. All corporate, governmental and
other proceedings in connection with the transactions contemplated by this
Amendment and all instruments and documents incidental thereto shall be in the
form and substance reasonably satisfactory to the Bank and the Bank shall have
received all such counterpart originals or certified or other copies of all such
instruments and documents as the Bank shall have reasonably requested.

         SECTION 4. AFFIRMATION AND ACKNOWLEDGMENT OF THE BORROWERS. Each
Borrower hereby ratifies and confirms all of its Obligations to the Bank, and
hereby affirms its absolute and unconditional promise to pay to the Bank the
Loans, the Reimbursement Obligations, and all other amounts due under the Credit
Agreement as amended hereby. Each Borrower hereby confirms that the Obligations
are and remain secured pursuant to the Security Documents and pursuant to all
other instruments and documents executed and delivered by the Borrowers as
security for the Obligations. TRC hereby acknowledges and agrees that its
obligations in respect of the Chilean Guaranty constitute Obligations hereunder
and are secured pursuant to the Security Documents to which TRC is a party and
all other instruments and documents executed and delivered by TRC as security
for the Obligations.

         SECTION 5. REPRESENTATIONS AND WARRANTIES. Each of the Borrowers hereby
represents and warrants to the Banks as follows:

         (a) The representations and warranties of the Borrowers contained in
the Credit Agreement, as amended hereby, were true and correct in all material
respects when made and continue to be true and correct in all material respects
on the date hereof, except, in each case to the extent of changes resulting from
transactions contemplated or permitted by the Loan Documents and this Amendment
and changes occurring in the ordinary course of business which singly or in the
aggregate are not materially adverse, and to the extent that such
representations and warranties relate expressly to an earlier date.

         (b) The execution, delivery and performance by the Borrowers of this
Amendment and the consummation of the transactions contemplated hereby; (i) are
within the corporate powers of each Borrower and have been duly authorized by
all necessary corporate action on the part of such Borrower, (ii) do not require
any approval, consent of, or filing with, any governmental agency or authority,
or any other person, association or entity, which bears on the validity of this
Amendment and which is required by law or the regulation or rule of any agency
or authority, or other person, association or entity, (iii) do not violate any
provisions of any order, writ, judgment, injunction, decree, determination or
award presently in effect in which any Borrower is named, or any provision of
the charter documents or by-laws of such Borrower, (iv) do not result in any
breach of or constitute a default under any agreement or instrument to which any
Borrower is a party or to which it or any of its properties are bound, including
without limitation any indenture, loan or credit agreement, lease, debt
instrument or mortgage, except for such breaches and defaults which would not
have a material adverse effect on any Borrower and its subsidiaries taken as a
whole, and (v) do not result in or require the creation or imposition of any

                                       28
<PAGE>

mortgage, deed of trust, pledge or encumbrance of any nature upon any of the
assets or properties of any Borrower.

         (c) This Amendment, the Credit Agreement as amended hereby, and the
other Loan Documents constitute the legal, valid and binding obligations of the
Borrowers, enforceable against each Borrower in accordance with their respective
terms, provided that (i) enforcement may be limited by applicable bankruptcy,
insolvency, reorganization, moratorium or similar laws of general application
affecting the rights and remedies of creditors, and (ii) enforcement may be
subject to general principles of equity, and the availability of the remedies of
specific performance and injunctive relief may be subject to the discretion of
the court before which any proceeding for such remedies may be brought.

         (d) No Default or Event of Default under any of the Loan Documents is
existing as of the date hereof.

         SECTION 6. NO OTHER AMENDMENTS. Except as expressly provided in this
Amendment, all of the terms and conditions of the Credit Agreement, the Note and
the other Loan Documents shall remain in full force and effect.

         SECTION 7. EXECUTION IN COUNTERPARTS. This Amendment may be executed in
any number of counterparts and by each party on a separate counterpart, each of
which when so executed and delivered shall be an original, but all of which
together shall constitute one instrument. In proving this Amendment, it shall
not be necessary to produce or account for more than one such counterpart signed
by the party against whom enforcement is sought.

                  [REMAINDER OF PAGE INTENTIONALLY LEFT BLANK]

                                       29
<PAGE>

         IN WITNESS WHEREOF, the undersigned have duly executed this Amendment
under seal as of the date first set forth above.

                                          TRC COMPANIES, INC.

                                          By: /s/ HAROLD C. ELSTON, JR.
                                                  ---------------------
                                                  Harold C. Elston, Jr.

                                          Title:  Senior Vice President and
                                                  Chief Financial Officer

                                          MONITORING INSTRUMENTS
                                          FOR THE ENVIRONMENT, INC.

                                          By: /s/ HAROLD C. ELSTON, JR.
                                                  ---------------------
                                                  Harold C. Elston, Jr.

                                          Title:  Treasurer and Clerk

                                          TRC ENVIRONMENTAL
                                          CORPORATION

                                          By: /s/ HAROLD C. ELSTON, JR.
                                                  ---------------------
                                                  Harold C. Elston, Jr.

                                          Title:  Vice President and Treasurer

                                          TRC ENGINEERS, INC.

                                          By: /s/ HAROLD C. ELSTON, JR.
                                                  ---------------------
                                                  Harold C. Elston, Jr.

                                          Title:  Vice President and Treasurer

                                          TRC WEATHER CONSULTANTS, INC.
                                          (f/k/a North American Weather
                                          Consultants)

                                          By: /s/ HAROLD C. ELSTON, JR.
                                                  ---------------------
                                                  Harold C. Elston, Jr.

                                          Title:   Secretary and Treasurer

                                          ENVIRONMENTAL SOLUTIONS, INC.

                                          By: /s/ HAROLD C. ELSTON, JR.
                                                  ---------------------
                                                  Harold C. Elston, Jr.

                                          Title:  Assistant Secretary
                                                  and Assistant Treasurer

                                       30
<PAGE>

                                          TRC MARIAH ASSOCIATES, INC.

                                          By: /s/ HAROLD C. ELSTON, JR.
                                                  ---------------------
                                                  Harold C. Elston, Jr.

                                          Title:  Vice President and Treasurer

                                          TRC GARROW ASSOCIATES, INC.

                                          By: /s/ HAROLD C. ELSTON, JR.
                                                  ---------------------
                                                  Harold C. Elston, Jr.

                                          Title:   Treasurer

                                          ALTON GEOSCIENCE, INC.

                                          By: /s/ HAROLD C. ELSTON, JR.
                                                  ---------------------
                                                  Harold C. Elston, Jr.

                                          Title:   Assistant Treasurer

                                          VECTRE CORPORATION

                                          By: /s/ HAROLD C. ELSTON, JR.
                                                  ---------------------
                                                  Harold C. Elston, Jr.

                                          Title:  Treasurer

                                          HUNTER ASSOCIATES TEXAS, LTD.

                                          By: /s/ HAROLD C. ELSTON, JR.
                                                  ---------------------
                                                  Harold C. Elston, Jr.

                                          Title:  Vice President

                                          FLEET NATIONAL BANK
                                          (f/k/a BankBoston, N.A.)

                                          By: /s/ MICHAEL NATOLA
                                                  ---------------------
                                                  Michael Natola

                                          Title:  Vice President

                                       31<PAGE>

                                 EXHIBIT 10.125

                                 AMENDMENT NO. 6 (the "Amendment") dated as of
                                 March 29, 2000 to the CREDIT, SECURITY,
                                 GUARANTY AND PLEDGE AGREEMENT, dated as of
                                 December 20, 1996, as amended (the "Credit
                                 Agreement"), among TRIMARK PICTURES, INC., a
                                 California corporation, and TRIMARK TELEVISION,
                                 INC., a Delaware corporation (each a "Borrower"
                                 and together, the "Borrowers"), the Guarantors
                                 named herein, the Lenders referred to herein,
                                 THE CHASE MANHATTAN BANK, a New York banking
                                 corporation, as Agent (the "Administrative
                                 Agent") for the Lenders and THE CHASE
                                 MANHATTAN BANK as Fronting Bank (the "Fronting
                                 Bank").

                             INTRODUCTORY STATEMENT

                  The Borrowers and the Guarantors have now requested that the
Lenders amend certain provisions of the Credit Agreement. The Lenders are
willing to comply with such request on the terms and subject to the conditions
hereinafter set forth.

                  Accordingly, the parties hereto hereby agree as follows:

                  Section 1. DEFINED TERMS. All capitalized terms not otherwise
defined in this Amendment are used herein as defined in the Credit Agreement.

                  Section 2. AMENDMENT TO THE CREDIT AGREEMENT. Subject to the
satisfaction of the conditions in Section 3 hereof, the Credit Agreement is
hereby amended effective as of the date hereof, as follows:

                  (a) Section 6.5 of the Credit Agreement is hereby amended to
insert $750,000 for $50,000 in each place it appears.

<PAGE>

EXHIBIT 10.125.  (CONTINUED)

                  Section 3. CONDITIONS TO EFFECTIVENESS. The effectiveness of
this Amendment is subject to the satisfaction in full of the following
conditions precedent.

                  (a)      The Administrative Agent shall have received executed
                           counterparts of this Amendment, which, when taken
                           together, bear the signatures of each party hereto;

                  (b)      All legal matters in connection with this Amendment
                           shall be reasonably satisfactory to Morgan, Lewis &
                           Bockius LLP, counsel for the Administrative Agent.

                  Section 4. REPRESENTATIONS AND WARRANTIES. Each of the Credit
Parties hereby represents, warrants and acknowledges to the Administrative Agent
(on behalf of itself, Fronting Bank and the Lenders) that:

                  (a)      Their respective obligations to the Lenders under the
                           Credit Agreement remain in full force and effect.

                  (b)      The representations and warranties contained in the
                           Credit Agreement and in the other Fundamental
                           Documents are true and correct in all material
                           respects on and as of the date hereof as if such
                           representations and warranties had been made on and
                           as of the date hereof (except to the extent such
                           representations and warranties expressly relate to an
                           earlier date).

                  (c)      After giving effect hereto, each of the Credit
                           Parties is in compliance with all the terms and
                           provisions set forth in the Credit Agreement and the
                           other Fundamental Documents and no Default or Event
                           of Default has occurred or is continuing under the
                           Credit Agreement or any other Fundamental Document.

                  (d)      The acknowledgments, representations and warranties
                           in this Section 4 have been a material inducement for
                           the Lenders to agree to enter into this Amendment,
                           (ii) the Lenders are relying on

<PAGE>

EXHIBIT 10.125.  (CONTINUED)

                           such acknowledgments, representations and warranties,
                           and (iii) the Lenders would not have entered into
                           this Amendment without such acknowledgments,
                           representations and warranties.

                  Section 5. FULL FORCE AND EFFECT. Except as expressly set
forth herein, this Amendment does not constitute a waiver or modification of any
provision of the Credit Agreement or a waiver of any Default or Event of Default
under the Credit Agreement, in either case whether or not known to the Lenders.
Except as expressly amended hereby, the Credit Agreement shall continue in full
force and effect in accordance with the provisions thereof on the date hereof.
As used herein, the terms "Credit Agreement", "this Agreement", "herein",
"hereafter", "hereto", "hereof", and words of similar import, shall, unless the
context otherwise requires, mean the Credit Agreement as amended by this
Amendment. References to the terms "Agreement" or "Credit Agreement" appearing
in the Exhibits or Schedules hereto or to the Credit Agreement, shall, unless
the context otherwise requires, mean the Credit Agreement as amended by this
Amendment.

                  SECTION 6. APPLICABLE LAW. THIS AMENDMENT SHALL BE GOVERNED
BY, AND CONSTRUED IN ACCORDANCE WITH, THE LAWS OF THE STATE OF NEW YORK WHICH
ARE APPLICABLE TO CONTRACTS MADE AND TO BE PERFORMED WHOLLY WITHIN THE STATE OF
NEW YORK.

                  Section 7. COUNTERPARTS. This Amendment may be executed in two
or more counterparts, each of which shall constitute as an original, but all of
which when taken together shall constitute but one instrument.

                  Section 8. EXPENSES. The Borrowers agree to pay all reasonable
out-of-pocket expenses incurred by the Administrative Agent in connection with
the preparation, execution, delivery, performance or enforcement of this
Amendment, the Credit Agreement or the other Fundamental Documents and any other
documentation contemplated hereby or thereby, including, but not limited to, the
reasonable fees and disbursements of external legal counsel for the
Administrative Agent and the allocated costs and charges of its internal legal
counsel.

<PAGE>

EXHIBIT 10.125.  (CONTINUED)

                  Section 9. HEADINGS. The headings of this Amendment are for
the purposes of reference only and shall not affect the construction of, or be
taken into consideration in interpreting, this Amendment.

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

                                     TRIMARK PICTURES, INC.
                                     TRIMARK TELEVISION, INC.
                                     TRIMARK HOLDINGS, INC.
                                     TRIMARK MUSIC
                                     CHEAP DATE, INC.
                                     WRITERS ON THE WAVE
                                     PURPLE TREE PRODUCTIONS, INC.
                                     LOVING GUN PRODUCTIONS, INC.
                                     TRIMARK INTERACTIVE

                                     By
                                       ----------------------------------------
                                     Name:
                                     Title:
                                     Authorized Signatory for each of the
                                     foregoing

                                     THE CHASE MANHATTAN BANK,
                                     individually and as Administrative Agent

                                     By:
                                        ---------------------------------------
                                        Name:
                                        Title:

                                     CITY NATIONAL BANK

                                     By
                                       ---------------------------------------
                                       Name:
                                       Title:

<PAGE>

EXHIBIT 10.125.  (CONTINUED)

                                     COMERICA BANK-CALIFORNIA

                                     By
                                       ----------------------------------------
                                       Name:
                                       Title:

                                     FIRST HAWAIIAN BANK

                                     By
                                       ----------------------------------------
                                       Name:
                                       Title:

                                     IMPERIAL BANK

                                     By
                                       ----------------------------------------
                                       Name:
                                       Title:

                                     SILICON VALLEY BANK

                                     By
                                       ----------------------------------------
                                       Name:
                                       Title:

                                     THE SUMITOMO TRUST & BANKING CO.,
                                     LTD., NEW YORK BRANCH

                                     By
                                       ----------------------------------------
                                       Name:
                                       Title:

                                     UNION BANK OF CALIFORNIA, N.A.

                                     By
                                       ----------------------------------------
                                       Name:
                                       Title:

                                     DE NATIONALE INVESTERINGSBANK N.V.

                                     By
                                       ----------------------------------------
                                       Name:
                                       Title:

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