Document:

<PAGE>

                                                                     EXHIBIT 4.2

                              First Amendment to
                     Amended and Restated Credit Agreement

          This First Amendment to Amended and Restated Credit Agreement (the
"First Amendment" or this "Amendment"), effective as of July 7, 2000 is entered
 ---------------           ---------
into by and among U.S. Concrete, Inc., a Delaware corporation, (the "Company"),
                                                                     -------
the Guarantors signatory hereto under the caption "Guarantors" (together with
each other Person who becomes a Guarantor, collectively, the "Guarantors"), the
                                                              ----------
Lenders signatory hereto under the caption "Lenders" (together with each other
Person who becomes a Lender, collectively, the "Lenders") and Chase Bank of
                                                -------
Texas, National Association, a national banking association, as administrative
agent for the other Lenders (in such capacity, together with any other Person
who becomes the administrative agent, the "Administrative Agent"), Bankers Trust
                                           --------------------
Company, as syndication agent, First Union National Bank, as documentation
agent, and Bank One, Texas, NA, Branch Banking & Trust Company, Credit Lyonnais
New York Branch and The Bank of Nova Scotia, collectively as co-managing agents
for the Lenders.

                             Preliminary Statement

          Whereas, the Company, the Guarantors, the Lenders, the Administrative
Agent, the syndication agent, the documentation agent and the co-managing agents
have entered into that certain Amended and Restated Credit Agreement dated as of
February 9, 2000 (said Credit Agreement, as amended and as may be further
amended, extended, supplemented or restated from time to time, the "Credit
                                                                    ------
Agreement") under the terms of which the Lenders agreed to make Revolving Credit
---------
Loans to the Company in an amount not exceeding $200,000,000.00; and

          Whereas, the Company has requested the Lenders and the Administrative
Agent to amend certain terms of the Credit Agreement; and

          Whereas, the Lenders and the Administrative Agent have agreed to do so
to the extent reflected in this Amendment, provided that each of the Company and
the Guarantors ratifies and confirms all of its respective obligations under the
Credit Agreement and the Loan Documents.

          NOW, THEREFORE, in consideration of the premises and for other good
and valuable consideration and the mutual benefits, covenants and agreements
herein expressed, the receipt and sufficiency of which are hereby acknowledged,
the parties hereby agree as follows:

          1.   Defined Terms.  (a)  All capitalized terms used in this Amendment
               -------------
and not otherwise defined herein shall have the meanings ascribed to such terms
in the Credit Agreement.
<PAGE>

               (b)   Amendment to Section 1.01.  Section 1.01 of the Credit
                     -------------------------
     Agreement is hereby amended by restating subsection (e) of the definition
     of Permitted Investments in its entirety to read as follows (the remainder
     of the definition of Permitted Investments is unchanged):

               "(e)  other advances and loans to officers and employees of the
               Borrower or any Subsidiary, so long as the aggregate principal
               amount of such advances and loans does not exceed $500,000 at any
               one time outstanding;".

               (c)   Amendment to Section 1.01.  Section 1.01 of the Credit
                     -------------------------
     Agreement is further amended by adding a new definition, "Bankruptcy Code"
                                                               ---------------
     to read in its entirety as follows:

               "Bankruptcy Code" means Title 11 of the United States Code, as
                ---------------
               amended and in effect from time to time.".

          2.   Ratification.  Each of the Company, as to itself and each
               ------------
Guarantor, and each Guarantor, as to itself, hereby ratifies all of its
respective obligations under the Credit Agreement (including the Guaranty
contained in Article X thereof) and each of the Loan Documents to which it is a
party, and agrees and acknowledges that the Credit Agreement and each of the
Loan Documents to which it is a party remains in full force and effect and shall
continue in full force and effect as amended and modified by this Amendment.
Nothing in this Amendment extinguishes, novates or releases any right, claim,
lien, security interest or entitlement of any of the Lenders or the
Administrative Agent created by or contained in any of such documents nor is the
Company or any Guarantor released from any covenant, warranty or obligation
created by or contained therein or herein.

          2.   Representations and Warranties. Each of the Company, as to itself
               ------------------------------
and each Guarantor, and each Guarantor, as to itself, hereby represents and
warrants to the Administrative Agent and the Lenders that (a) this Amendment has
been duly executed and delivered on behalf of the Company and such Guarantor,
subject to applicable bankruptcy, insolvency, fraudulent transfer,
reorganization, moratorium or other laws affecting creditors' rights generally
and subject to general principles of equity, regardless of whether considered in
a proceeding in equity or at law, (b) this Amendment constitutes a valid and
legally binding agreement enforceable against the Company or such Guarantor, as
the case may be, in accordance with its terms, (c) the representations and
warranties contained in the Credit Agreement and the Loan Documents are true and
correct on and as of the date hereof in all material respects as though made as
of the date hereof, except as heretofore otherwise disclosed in writing to the
Administrative Agent, (d) no Default exists under the Credit Agreement or under
any other Loan Document and (e) the execution, delivery and performance of this
Amendment has been duly authorized by the Company and each Guarantor.
<PAGE>

          3.   Conditions to Effectiveness.  This Amendment shall be effective
               ---------------------------
upon the execution and delivery hereof by all parties to the Administrative
Agent and receipt by the Administrative Agent of this Amendment.

          4.   Counterparts.  This Amendment may be signed in any number of
               ------------
counterparts, which may be delivered in original or facsimile form each of which
shall be construed as an original, but all of which together shall constitute
one and the same instrument.

          5.   Governing Law. This Agreement, all Notes, the other Loan
               -------------
Documents and all other documents executed in connection herewith shall be
deemed to be contracts and agreements under the laws of the State of Texas and
of the United States of America and for all purposes shall be construed in
accordance with, and governed by, the laws of Texas and of the United States.

          6.   Final Agreement of the Parties.  THIS AMENDMENT AND THE CREDIT
               ------------------------------
AGREEMENT AND THE OTHER LOAN DOCUMENTS REPRESENT THE FINAL AGREEMENT BETWEEN THE
PARTIES AND MAY NOT BE CONTRADICTED BY EVIDENCE OF PRIOR, CONTEMPORANEOUS OR
SUBSEQUENT ORAL AGREEMENTS OF THE PARTIES. THERE ARE NO UNWRITTEN ORAL
AGREEMENTS BETWEEN THE PARTIES.

                    [Remainder of Page Intentionally Blank]
<PAGE>

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

                                   Company:

                                        U.S. CONCRETE

                                        By:  /s/ Michael W. Harlan
                                             ---------------------
                                             Michael W. Harlan
                                             Senior Vice President
<PAGE>

                         Guarantors:

                         AFTM Corporation, a Michigan corporation
                         Atlas Concrete, Inc., an Oklahoma corporation
                         Atlas-Tuck Concrete, Inc., an Oklahoma corporation
                         B.W.B., Inc. of Michigan, a Delaware corporation
                         Baer Concrete, Inc., a New Jersey corporation
                         Beall Concrete Enterprises, Ltd., a Texas limited
                            partnership
                         Beall Industries, Inc., a Texas corporation
                         Beall Management, Inc., a Texas corporation
                         Beall Trucking, Inc., an Oklahoma corporation
                         Carrier Excavation and Foundation Company, a Delaware
                            corporation
                         Central Concrete Supply Co., Inc., a California
                            corporation
                         Concrete XX Acquisition, Inc., a Delaware corporation
                         Corden, Inc., a Michigan corporation
                         Cornillie Fuel & Supply, Inc., a Michigan corporation
                         Cornillie Leasing, Inc., a Michigan corporation
                         Dencor, Inc., a Michigan corporation
                         DYNA, Inc., a Delaware corporation
                         E.B. Metzen, Inc., a Michigan corporation
                         Fendt Transit Mix, Inc., a Michigan corporation
                         Hunter Equipment Company, a Michigan corporation
                         Olive Branch Ready Mix, Inc., a Delaware corporation
                         Opportunity Concrete Corporation, a District of
                            Columbia corporation
                         Premix Concrete Corp., a Delaware corporation
                         R.G. Evans/Associates d/b/a/ Santa Rosa Cast Products
                            Co., a California corporation
                         Ready Mix Concrete Company of Knoxville, a Delaware
                            corporation
                         San Diego Precast Concrete, Inc., a Delaware
                            corporation
                         Stokes Transit Mix, Inc., an Oklahoma corporation
                         Superior Materials Company, Inc., a Delaware
                            corporation
                         Superior Redi-Mix, Inc., a Michigan corporation
                         USC GP, Inc., a Delaware corporation
                         USC Management Co., LP, a Texas limited partnership
                         Western Concrete Products, Inc., a Delaware corporation

                         By:               /s/ Michael W. Harlan
                             ------------------------------------------------
                                               Michael W. Harlan
                                                Vice President
<PAGE>

                              Administrative Agent/Lender:
                              ---------------------------

                                   CHASE BANK OF TEXAS,
                                   NATIONAL ASSOCIATION

                                   By:     /s/ James R. Dolphin
                                         ------------------------------------
                                                 James R. Dolphin
                                                 Senior Vice President
<PAGE>

                              Syndication Agent/Lender:
                              ------------------------

                                   BANKERS TRUST COMPANY

                                   By:   /s/ Pam Divino
                                        -------------------------------
                                   Name:  Pam Divino
                                   Title: Vice President
<PAGE>

                              Documentation Agent/Lender:
                              --------------------------

                                   FIRST UNION NATIONAL BANK

                                   By:   /s/ David C. Hauglid
                                        --------------------------------
                                   Name:  David C. Hauglid
                                   Title: Vice President
<PAGE>

                              Lender:
                              ------

                                   BANK OF AMERICA, N.A.,

                                   By:   /s/ William B. Borus
                                        ------------------------------------
                                   Name:  William B. Borus
                                   Title: Senior Vice President
<PAGE>

                              Co-Managing Agent/Lender:
                              ------------------------

                                   BANK ONE, TEXAS, N.A.

                                   By:   /s/ John J. Zollinger, IV
                                        ------------------------------------
                                   Name:  John J. Zollinger, IV
                                   Title: Vice President
<PAGE>

                              Co-Managing Agent/Lender:
                              ------------------------

                                   CREDIT LYONNAIS
                                   NEW YORK BRANCH

                                   By:   /s/ Robert Ivosevich
                                        ---------------------------------
                                   Name:  Robert Ivosevich
                                   Title: Senior Vice President
<PAGE>

                              Co-Managing Agent/Lender:
                              ------------------------

                                   THE BANK OF NOVA SCOTIA

                                   By:   /s/ F. C. H. Ashby
                                        -------------------------------------
                                   Name:  F. C. H. Ashby
                                   Title: Senior Manager Loan Operations
<PAGE>

                                   Co-Managing Agent/Lender:
                                   ------------------------

                                   BRANCH BANKING & TRUST COMPANY

                                   By:   /s/ Cory Boyte
                                        ----------------------------------
                                   Name:  Cory Boyte
                                   Title: Vice President
<PAGE>

                              Lender:
                              ------

                                   COMERICA BANK

                                   By:   /s/ Mark B. Grover
                                        -------------------------------------
                                   Name:  Mark B. Grover
                                   Title: First Vice President<PAGE>

                                                                     EXHIBIT 4.3

                              Second Amendment to
                     Amended and Restated Credit Agreement

          This Second Amendment to Amended and Restated Credit Agreement (this
"Second Amendment"), effective as of September 30, 2000, is entered into by and
 ----------------
among U.S. Concrete, Inc., a Delaware corporation, (the "Company"), the
                                                         -------
Guarantors signatory hereto under the caption "Guarantors" (together with each
other Person who becomes a Guarantor, collectively, the "Guarantors"), the
                                                         ----------
Lenders signatory hereto under the caption "Lenders" (together with each other
Person who becomes a Lender, collectively, the "Lenders") and The Chase
                                                -------
Manhattan Bank, a New York banking corporation, successor-in-interest by merger
to Chase Bank of Texas, National Association, as administrative agent for the
other Lenders (in such capacity, together with any other Person who becomes the
administrative agent, the "Administrative Agent"), Bankers Trust Company, as
                           --------------------
syndication agent, First Union National Bank, as documentation agent, and Bank
One, Texas, NA, Branch Banking & Trust Company, Credit Lyonnais New York Branch
and The Bank of Nova Scotia, collectively as co-managing agents for the Lenders.

                             Preliminary Statement

          Whereas, the Company, the Guarantors, the Lenders, the Administrative
Agent, the syndication agent, the documentation agent and the co-managing agents
have entered into that certain Amended and Restated Credit Agreement dated as of
February 9, 2000 (the "Original Credit Agreement") under the terms of which the
                       -------------------------
Lenders agreed to make Revolving Credit Loans to the Company in an amount not
exceeding $200,000,000.00; and

          Whereas, the Company, the Guarantors, the Lenders, the Administrative
Agent, the syndication agent, the documentation agent and the co-managing agents
have amended the Original Credit Agreement pursuant to that certain First
Amendment to Amended and Restated Credit Agreement dated as of July 7, 2000 (the
"First Amendment")(the Original Credit Agreement, as amended by the First
Amendment and as may be further amended, extended, supplemented or restated from
time to time, the "Credit Agreement"); and
                   ----------------

          Whereas, the Company has requested the Lenders and the Administrative
Agent to further amend certain terms of the Credit Agreement; and

          Whereas, the Lenders and the Administrative Agent have agreed to do so
to the extent reflected in this Second Amendment, provided that each of the
Company and the Guarantors ratifies and confirms all of its respective
obligations under the Credit Agreement and the Loan Documents.

          NOW, THEREFORE, in consideration of the premises and for other good
and valuable consideration and the mutual benefits, covenants and agreements
herein expressed, the receipt and sufficiency of which are hereby acknowledged,
the parties hereby agree as follows:
<PAGE>

          1.   Defined Terms. All capitalized terms used in this Second
               -------------
Amendment and not otherwise defined herein shall have the meanings ascribed to
such terms in the Credit Agreement.

          2.   Amendment to Section 1.01.  Section 1.01 of the Credit Agreement
               -------------------------
is hereby amended as follows:

          (a)  The definition of "Capital Markets Event" in Section 1.01 of the
                                  ---------------------
     Credit Agreement is hereby deleted in its entirety and replaced by the
     following:

          ""Capital Markets Event" means the first issuance after the Effective
            ---------------------
          Date by the Borrower or any Subsidiary of (i) Subordinated Debt, (ii)
          preferred stock on terms reasonably satisfactory to the Administrative
          Agent and the Lenders or (iii) common equity of the Borrower, from
          which the gross proceeds, when added to the aggregate gross proceeds
          of any other previous issuance after the Effective Date by the
          Borrower or any Subsidiary of (i) Subordinated Debt, (ii) preferred
          stock on terms reasonably satisfactory to the Administrative Agent and
          the Lenders and (iii) common equity of the Borrower, equals an
          aggregate principal amount of not less than $75,000,000.".

          (b)  The definition of "Applicable Margin" in Section 1.01 of the
                                  -----------------
     Credit Agreement is hereby deleted in its entirety and replaced by the
     following:

          ""Applicable Margin" means, for any day during any period between two
            -----------------
          successive Financial Statement Delivery Dates commencing on the first
          Financial Statement Delivery Date in such period and ending on the day
          before the following Financial Statement Delivery Date, with respect
          to any ABR Loan, Eurodollar Revolving Loan, or with respect to the
          commitment fees payable hereunder, as the case may be, the applicable
          margin per annum set forth in the appropriate column below under the
          caption "ABR Spread Before Capital Markets Event", "Eurodollar Spread
          Before Capital Markets Event" or "Commitment Fee Rate", as the case
          may be, for the ratio of Funded Debt to EBITDA for the fiscal period
          for which such financial statements were delivered as of the Financial
          Statement Delivery Date; provided that, upon the occurrence of any
                                   --------
          Capital Markets Event, the columns under the captions "ABR Spread
          After Capital Markets Event" and "Eurodollar Spread After Capital
          Markets Event" shall be used to determine the applicable margin with
          respect to any ABR Loan or Eurodollar Revolving Loan, as the case may
          be.  The applicable margin for all of the rows of such table under the
          caption "Commitment Fee" shall remain unchanged:
<PAGE>

<TABLE>
<CAPTION>
                                                 ABR     Eurodollar    ABR     Eurodollar
                                                Spread     Spread    Spread      Spread
                                                Before     Before     After       After
                                               Capital    Capital    Capital     Capital
             Ratio of Funded Debt              Markets    Markets    Markets     Markets   Commitment
                 To EBITDA                      Event      Event      Event       Event     Fee Rate
                 ---------                     --------  --------  -----------  --------  -----------
           <S>                                 <C>       <C>       <C>          <C>       <C>
           * 3.0 to 1.0                         2.00%     3.00%        1.75%     2.75%         .50%
           * 2.5 to 1.0 but ** 3.0 to 1.0       1.75%     2.75%        1.50%     2.50%         .50%
           * 2.0 to 1.0 but ** 2.5 to 1.0       1.50%     2.50%        1.25%     2.25%         .50%
           * 1.5 to 1.0 but ** 2.0 to 1.0       1.00%     2.00%        1.00%     2.00%         .50%
           * 1.0 to 1.0 but ** 1.5 to 1.0        .75%     1.75%         .75%     1.75%        .375%
           *  .5 to 1.0 but ** 1.0 to 1.0        .50%     1.50%         .50%     1.50%        .375%
          **  .5 to 1.0                          .25%     1.25%         .25%     1.25%        .250%
</TABLE>

                    For purposes of the foregoing, (a) if sufficient information
          does not exist to calculate the Applicable Margin, or the Borrower has
          not delivered such information to the Administrative Agent in a timely
          manner, Eurodollar Loans shall not be available to the Borrower and
          the Applicable Margin for ABR Loans shall be 2.00% per annum and for
          the commitment fee shall be .50% per annum; and (b) if (i) the Ratio
          of Funded Debt to EBITDA shall change upon delivery of any financial
          statement required under Section 5.01 or (ii) a Capital Markets Event
                                   ------------
          shall have occurred, such change in the Applicable Margin shall be
          effective as of the date on which any such financial statement is
          delivered or on the date of the Capital Markets Event shall have
          occurred, as the case may be, irrespective of whether it is in the
          middle of an Interest Period or when notice of such change shall have
          been furnished by the Borrower to the Administrative Agent and the
          Lenders pursuant to Section 5.01(c) hereof or otherwise.  Each change
          in the Applicable Margin shall apply during the period commencing on
          the effective date of such change and ending on the date immediately
          preceding the effective date of the next such change.".

          (c)  The definition of "Commitment" in Section 1.01 of the Credit
                                  ----------
     Agreement is hereby deleted in its entirety and replaced by the following:

          ""Commitment" means (a) with respect to each Lender, the commitment of
            ----------
          such Lender to make Revolving Loans and to acquire participations in
          Letters of Credit and Swingline Loans hereunder, expressed as an
          amount representing the maximum aggregate amount of such Lender's
          Revolving Credit Exposure hereunder, as such commitment may be (i)
          reduced from time to time pursuant to Section 2.08 and/or (ii) reduced
                                                ------------
          or increased from time to time pursuant to assignments by or to such
          Lender pursuant to Section 9.04 and (b) with respect to the Swingline
                             ------------
          Lender, its commitment to make Swingline Loans.  The initial amount of
          each Lender's Commitment is set forth on Schedule 2.01 under the
                                                   -------------
          caption "Initial Commitment", or in the Assignment and Acceptance
          pursuant to which such Lender shall have assumed its Commitment, as
          applicable.  The aggregate amount of the Lenders' total Commitments is
          $200,000,000.00, unless reduced pursuant to Section 2.08.".
                                                      ------------
___________
*  more than or equal to
** less than
<PAGE>

          (d) The definition of "Restricted Payment" in Section 1.01 of the
                                 ------------------
     Credit Agreement is hereby deleted in its entirety and replaced by the
     following:

          ""Restricted Payment" means any dividend or other distribution
            ------------------
          (whether in cash, securities or other property, except distributions
          payable in capital stock) with respect to any shares of any class of
          capital stock of the Borrower or any Subsidiary (other than
          distributions to the Borrower or any Subsidiary), any payment (whether
          in cash, securities or other property), including any sinking fund or
          similar deposit, on account of the purchase, redemption, retirement,
          acquisition, cancellation or termination of any such shares of capital
          stock of the Borrower, any option, warrant or other right to acquire
          any such shares of capital stock of the Borrower or any voluntary
          prepayment, purchase, redemption, retirement or acquisition of any
          debt of the Borrower subordinated to the Obligations which is made at
          the option of the Borrower.".

          (e) The definition of "Subordinated Debt" in Section 1.01 of the
                                 -----------------
     Credit Agreement is hereby deleted in its entirety and replaced by the
     following:

          ""Subordinated Debt" means any Indebtedness of the Borrower or any
            -----------------
          Subsidiary permitted hereunder that is (i) subordinated to the
          Indebtedness incurred under this Agreement on terms substantially in
          form and substance to those contained in Exhibit 1.01C to the Credit
                                                   -------------
          Agreement, and (ii) incurred pursuant to the terms and conditions
          contained in the Summary of Principal Terms attached as Exhibit A to
                                                                  ---------
          the Second Amendment to Amended and Restated Credit Agreement, or
          (iii) otherwise approved by the Required Lenders, including such
          Indebtedness incurred in connection with a Capital Markets Event, and,
          upon obtaining the consent of the Required Lenders, any renewals, or
          extensions thereof, amendments thereto, substitutions therefor or
          restatements and refinancing thereof.".

          3.   Amendment to Section 2.08(b).  Section 2.08(b) of the Credit
               ----------------------------
Agreement is hereby deleted in its entirety and is replaced by the following:

     "(b)  Intentionally Deleted.".

          4.   Amendment to Section 2.09(b).  Section 2.09(b) of the Credit
               ----------------------------
Agreement is hereby deleted in its entirety and is replaced by the following:

     "(b)  Intentionally Deleted.".

          5.   Amendment to Section 5.01.  Section 5.01 of the Credit Agreement
               -------------------------
is hereby amended by adding a new subsection 5.01(j) to read in its entirety as
follows:

     "(j)  on or before November 15, 2000 the Company shall provide to the
     Administrative Agent and the Lenders an officer's certificate executed by a
     Financial Officer of the
<PAGE>

     Company, which certificate shall contain, and shall certify as correct,
     recalculations made by the Company as of October 31, 2000 of the
     calculations set forth in the certificate most recently delivered pursuant
     to Section 5.01(c), evidencing the Company's compliance as of October 31,
     2000 with the covenants contained in Section 6.08 through 6.10, inclusive.
     In the event a Capital Markets Event has not occurred on or before October
     31, 2000, the certificate described in the immediately preceding sentence
     shall also include pro forma calculations showing the effect that a Capital
     Markets Event would have on the Company's compliance as of October 31, 2000
     with the covenants contained in Section 6.08 through 6.10, inclusive.

          6.   Amendment to Section 6.08(b).  Section 6.08(b) of the Credit
               ----------------------------
Agreement is hereby deleted in its entirety and replaced by the following:

     "(b)  Asset Coverage Ratio.  The Borrower will not at any time permit the
           --------------------
     ratio of: (a) (i) accounts receivable plus (ii) inventory plus (iii) the
     net book value of all property, plant and equipment in each case as
     reflected on the financial statements delivered pursuant to Section 5.01,
                                                                 ------------
     to (b) Funded Debt minus Subordinated Debt, to be less than (i) 1.0 to 1.0
     for the period from the Effective Date through November 15, 2000 and (ii)
     1.25 to 1.0 for the period from November 16, 2000 and thereafter.  For the
     purposes of calculating this Asset Coverage Ratio, the Borrower may use (i)
     the book value of such assets as recorded on the financials delivered under
     Section 5.01 hereof or (ii) the fair market value of such assets, as such
     fair market value is determined by a third party approved by the
     Administrative Agent in its sole discretion; provided, that in the event
                                                  --------
     any fair market valuation has been determined which for any asset is less
     that its book value, such fair market valuation must be used in the
     calculation of this Asset Coverage Ratio.".

          7.   Amendment to Section 6.08(c). Section 6.08(c) of the Credit
               ----------------------------
Agreement is hereby deleted in its entirety and replaced by the following:

     "(c)  Senior Debt Leverage Ratio.  The Borrower will not at any time permit
           --------------------------
     the ratio of (i) Funded Debt minus Subordinated Debt to (ii) EBITDA
     calculated on a rolling four (4) quarter basis, to be greater than (i) 2.75
     to 1.0 for the period from the Effective Date through June 29, 2000, (ii)
     2.50 to 1.0 for the period from June 30, 2000 through November 15, 2000 and
     (iii) 2.25 to 1.0 for the period from November 16, 2000 and thereafter;
     provided, that upon the occurrence of a Capital Markets Event, such ratio
     --------
     will not be greater than 2.25 to 1.0 for the period from the date of
     occurrence of the Capital Markets Event and thereafter.".

          8.   Amendment to Section 6.11(vi).  Section 6.11(vi) of the Credit
               -----------------------------
Agreement is hereby deleted in its entirety and replaced by the following:

     "(vi)  at any time prior to the occurrence of a Capital Markets Event,
     concurrently with the delivery of the Permitted Acquisition Notice, the
     Borrower shall have provided to the Administrative Agent and the Lenders a
     calculation by the Borrower of the ratio of pro forma Funded Debt minus
     Subordinated Debt (after giving effect to the proposed
<PAGE>

     Acquisition) to pro forma EBITDA (after giving effect to the proposed
     Acquisition) showing that such ratio will not at any time be greater than
     (A) 2.50 to 1.0 for the period from the Effective Date through June 29,
     2000, (B) 2.25 to 1.0 for the period from June 30, 2000 through November
     15, 2000 and (C) 2.00 to 1.0 for the period from November 16, 2000 and
     thereafter."

          9.   Amendment to Exhibit 1.01C.  Exhibit 1.01C to the Credit
               --------------------------
Agreement is hereby amended by deleting in its entirety the last sentence on the
second page of such Exhibit which reads "If a payment or distribution is made to
holders of the Notes that, due to the subordination provisions, should not have
been made to them, such holders are required to hold it in trust for the holders
of Senior Indebtedness and pay the payment or distribution over to holders of
Senior Indebtedness as their interests may appear" and replacing such sentence
by the following:

     "If a payment or distribution is made to holders of the Notes that, due to
     the subordination provisions, should not have been made to them, such
     holders are required to hold it in trust for the holders of Senior
     Indebtedness and pay the payment or distribution over to holders of Senior
     Indebtedness as their interests may appear; provided, however, that
                                                 --------  -------
     distributions of securities of U.S. Concrete to the holders of the Notes,
     the payment of which securities is subordinate to the Senior Indebtedness,
     may be made to and retained by the holders of the Notes."

          10.  Amendment to Schedule 2.01.  The column in Schedule 2.01 to the
               --------------------------
Credit Agreement captioned "Commitment Subsequent to Capital Markets Event" is
hereby deleted in its entirety.

          11.  Ratification.  Each of the Company, as to itself and each
               ------------
Guarantor, and each Guarantor, as to itself, hereby ratifies all of its
respective obligations under the Credit Agreement (including the Guaranty
contained in Article X thereof) and each of the Loan Documents to which it is a
party, and agrees and acknowledges that the Credit Agreement and each of the
Loan Documents to which it is a party remains in full force and effect and shall
continue in full force and effect as amended and modified by this Second
Amendment.  Nothing in this Second Amendment extinguishes, novates or releases
any right, claim, lien, security interest or entitlement of any of the Lenders
or the Administrative Agent created by or contained in any of such documents nor
is the Company or any Guarantor released from any covenant, warranty or
obligation created by or contained therein or herein.

          12.  Representations and Warranties.  Each of the Company, as to
               ------------------------------
itself and each Guarantor, and each Guarantor, as to itself, hereby represents
and warrants to the Administrative Agent and the Lenders that (a) this Second
Amendment has been duly executed and delivered on behalf of the Company and such
Guarantor, subject to applicable bankruptcy, insolvency, fraudulent transfer,
reorganization, moratorium or other laws affecting creditors' rights generally
and subject to general principles of equity, regardless of whether considered in
a proceeding in equity or at law, (b) this Second Amendment constitutes a valid
and legally binding agreement enforceable against the Company or such Guarantor,
as the case may be, in accordance with its terms, subject to applicable
bankruptcy, insolvency, fraudulent transfer, reorganization, moratorium or other
laws
<PAGE>

affecting creditors' rights generally and subject to general principles of
equity, regardless of whether considered in a proceeding in equity or at law,
(c) the representations and warranties contained in the Credit Agreement and the
Loan Documents shall be true and correct on and as of the date of each Borrowing
and the date of issuance, amendment, renewal or extension of each Letter of
Credit, as applicable, except to the extent such representations and warranties
relate to a prior date or, after prior notice to the Administrative Agent, are
untrue or incorrect as a result of transactions permitted by the Loan Documents,
(d) no Default exists under the Credit Agreement or under any other Loan
Document and (e) the execution, delivery and performance of this Second
Amendment has been duly authorized by the Company and each Guarantor.

          13.  Conditions to Effectiveness.  This Second Amendment shall be
               ---------------------------
effective upon (i) the execution and delivery hereof by all parties to the
Administrative Agent and receipt by the Administrative Agent of this Second
Amendment, and (ii) receipt by the Administrative Agent of an amendment fee due
and payable by the Company to the Administrative Agent for the pro rata benefit
of the Lenders of .075% of the total Commitments.

          14.  Counterparts.  This Second Amendment may be signed in any number
               ------------
of counterparts, which may be delivered in original or facsimile form each of
which shall be construed as an original, but all of which together shall
constitute one and the same instrument.

          15.  Governing Law. This Second Amendment, the Credit Agreement, all
               -------------
Notes, the other Loan Documents and all other documents executed in connection
herewith shall be deemed to be contracts and agreements under the laws of the
State of Texas and of the United States of America and for all purposes shall be
construed in accordance with, and governed by, the laws of Texas and of the
United States.

          16.  Final Agreement of the Parties.  THIS SECOND AMENDMENT AND THE
               ------------------------------
CREDIT AGREEMENT AND THE OTHER LOAN DOCUMENTS REPRESENT THE FINAL AGREEMENT
BETWEEN THE PARTIES AND MAY NOT BE CONTRADICTED BY EVIDENCE OF PRIOR,
CONTEMPORANEOUS OR SUBSEQUENT ORAL AGREEMENTS OF THE PARTIES.  THERE ARE NO
UNWRITTEN ORAL AGREEMENTS BETWEEN THE PARTIES.

                    [Remainder of Page Intentionally Blank]
<PAGE>

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

                         Company:

                              U.S. CONCRETE

                              By: /s/ Michael W. Harlan
                                  ---------------------
                                  Michael W. Harlan
                                  Senior Vice President
<PAGE>

Guarantors:

AFTM Corporation, a Michigan corporation
Atlas Concrete, Inc., an Oklahoma corporation
Atlas-Tuck Concrete, Inc., an Oklahoma corporation
B.W.B., Inc. of Michigan, a Delaware corporation
Baer Concrete, Inc., a New Jersey corporation
Beall Concrete Enterprises, Ltd., a Texas limited partnership
Beall Industries, Inc., a Texas corporation
Beall Management, Inc., a Texas corporation
Beall Trucking, Inc., an Oklahoma corporation
Carrier Excavation and Foundation Company, a Delaware corporation
Central Concrete Supply Co., Inc., a California corporation
Concrete XX Acquisition, Inc., a Delaware corporation
Corden, Inc., a Michigan corporation
Cornillie Fuel & Supply, Inc., a Michigan corporation
Cornillie Leasing, Inc., a Michigan corporation
Dencor, Inc., a Michigan corporation
DYNA, Inc., a Delaware corporation
E.B. Metzen, Inc., a Michigan corporation
Fendt Transit Mix, Inc., a Michigan corporation
Hunter Equipment Company, a Michigan corporation
Olive Branch Ready Mix, Inc., a Delaware corporation
Opportunity Concrete Corporation, a District of Columbia corporation
Premix Concrete Corp., a Delaware corporation
R.G. Evans/Associates d/b/a/ Santa Rosa Cast Products Co., a California
     corporation
Ready Mix Concrete Company of Knoxville, a Delaware corporation
San Diego Precast Concrete, Inc., a Delaware corporation
Stokes Transit Mix, Inc., an Oklahoma corporation
Superior Materials Company, Inc., a Delaware corporation
Superior Redi-Mix, Inc., a Michigan corporation
USC GP, Inc., a Delaware corporation
USC Management Co., LP, a Texas limited partnership
Western Concrete Products, Inc., a Delaware corporation

By:          /s/ Michael W. Harlan
    ------------------------------------------
                Michael W. Harlan
                 Vice President
<PAGE>

                         Administrative Agent/Lender:
                         ---------------------------

                              CHASE BANK OF TEXAS,
                              NATIONAL ASSOCIATION

                              By: /s/ James R. Dolphin
                                  -------------------------
                                  James R. Dolphin
                                  Senior Vice President
<PAGE>

                         Syndication Agent/Lender:
                         ------------------------

                              BANKERS TRUST COMPANY

                              By:    /s/ Pam Divino
                                     --------------------
                              Name:  Pam Divino
                              Title: Vice President
<PAGE>

                           Documentation Agent/Lender:
                           --------------------------

                              FIRST UNION NATIONAL BANK

                              By:    /s/ David C. Hauglid
                                     --------------------
                              Name:  David C. Hauglid
                              Title: Vice President
<PAGE>

                           Lender:
                           ------

                              BANK OF AMERICA, N.A.,

                              By:    /s/ William B. Borus
                                     --------------------
                              Name:  William B. Borus
                              Title: Senior Vice President
<PAGE>

                           Co-Managing Agent/Lender:
                           ------------------------

                              BANK ONE, TEXAS, N.A.

                              By:    /s/ John J. Zollinger, IV
                                     -------------------------
                              Name:  John J. Zollinger, IV
                              Title: Vice President
<PAGE>

                         Co-Managing Agent/Lender:
                         ------------------------

                              CREDIT LYONNAIS
                              NEW YORK BRANCH

                              By:    /s/ Atilla Koc
                                     --------------
                              Name:  Atilla Koc
                              Title: Senior Vice President
<PAGE>

                         Co-Managing Agent/Lender:
                         ------------------------

                              THE BANK OF NOVA SCOTIA

                              By:    /s/ F. C. H. Ashby
                                     ------------------
                              Name:  F. C. H. Ashby
                              Title: Senior Manager Loan Operations
<PAGE>

                         Co-Managing Agent/Lender:
                         ------------------------

                              BRANCH BANKING & TRUST COMPANY

                              By:    /s/ Cory Boyte
                                     --------------
                              Name:  Cory Boyte
                              Title: Vice President
<PAGE>

                         Lender:
                         ------

                              COMERICA BANK

                              By:    /s/ Mark B. Grover
                                     ------------------
                              Name:  Mark B. Grover
                              Title: First Vice President
<PAGE>

                                   EXHIBIT A
                                   ---------

                Summary of Principal Terms of Subordinated Debt
                -----------------------------------------------

----------------------
Issue                    Senior Subordinated Notes (the "Notes").

----------------------
Issuer                   U.S. Concrete, Inc. (the "Company").

----------------------
Guarantors               The Notes shall be unconditionally guaranteed, on a
                         subordinated basis, as to the payment of principal,
                         interest and premium, if any, by each Material
                         Subsidiary.

----------------------
Principal Amount         Approximately $75,000,000

----------------------
Noteholders              Accredited institutional investors

----------------------
Final Maturity           Ten years from the date of takedown.

----------------------
Amortization             Seven equal annual principal repayments beginning on
                         the fourth anniversary of the issuance of the Notes
                         resulting in an average life of seven years.

----------------------
Interest Rate            12%. Interest will be payable quarterly in arrears.

----------------------
Price                    100% of Principal Amount

----------------------
Takedown                 Immediately following completion of documentation.

----------------------
Use of Proceeds          General corporate purposes of the Company including the
                         repayment of debt.

----------------------
Ranking                  The Notes shall be subordinated to the Company's Senior
                         Indebtedness.

----------------------
Optional Redemption      The Issuer may redeem the Notes, in whole or pro rata
                         in part, at any time. In the event of prepayment, the
                         Issuer will pay an amount equal to par plus accrued
                         interest plus a "Make Whole Premium", as defined
                         herein.

----------------------
Make Whole Premium       Make Whole Premium shall be defined as the difference
                         (not to be less than zero) between (a) the present
                         value of the expected future cash flows from the Notes
                         (minus any accrued Interest) discounted at a rate equal
                         to the then-current Treasury Note yield corresponding
                         closest to

                              EXHIBIT A - Page 1
<PAGE>

                              the remaining weighted average life on the Notes
                              calculated at the time of the prepayment plus 150
                              basis points, and (b) the Principal Amount
                              outstanding.

---------------------------
Change of Control             In the event that one person or a group of related
                              persons (other than the existing management group)
                              acquires more than 50% of the voting shares of the
                              Company, a Change of Control will be deemed to
                              have occurred. In the event of a Change of
                              Control, the Noteholders individually will have
                              the right, but not the obligation, to put their
                              Notes back to the Company at an amount equal to
                              par plus accrued interest plus the Modified Make
                              Whole Premium, if any.

---------------------------
Modified Make Whole Premium   Shall mean the Make Whole Premium computed as if
                              the phrase "150 basis points" read "250 basis
                              points."

---------------------------
Financial Covenants

  Total Debt Leverage Ratio   The Company will maintain the ratio of
                              Consolidated Total Debt to EBITDA at no greater
                              than 3.25 to 1.0. This ratio will be calculated at
                              the end of each fiscal quarter based on the
                              previous four fiscal quarters.

  Senior Debt Leverage Ratio  The Company will maintain the ratio of
                              Consolidated Senior Debt to EBITDA at no greater
                              than 2.25 to 1.0. This ratio will be calculated at
                              the end of each fiscal quarter based on the
                              previous four fiscal quarters. In the event that
                              the covenants pertaining to Consolidated Senior
                              Debt in the Company's principal bank lending
                              agreement shall allow a greater amount of
                              Consolidated Senior Debt than is otherwise
                              permitted herein, then such greater amount shall
                              be the maximum allowable amount of Consolidated
                              Senior Debt; provided that, in any event, The
                              Company will maintain the ratio of Consolidated
                              Senior Debt to EBITDA at no greater than 2.50 to
                              1.0.

  Fixed Charge Coverage Ratio The Company will not permit the ratio of (i)
                              EBITDA less cash taxes plus rent payments under
                              operating leases to (ii) the sum of (a) cash
                              interest plus (b) rent payments under operating
                              leases plus (c) maintenance capital expenditures
                              (defined as depreciation for the same period) to
                              be less than 1.0 to 1.0. This ratio will be
                              calculated at the end of each fiscal quarter based
                              on the previous four fiscal quarters.

  Mergers and Consolidations  The Company will not merge into or consolidate
                              with (or sell or convey all or substantially all
                              of its assets to) any other person unless (a) the
                              Company is the surviving entity or the surviving
                              entity expressly assumes the punctual payment and
                              observance of all obligations under the Notes, (b)
                              the surviving entity shall not immediately after
                              such merger or sale of assets be in default on the
                              Notes, and (c) the surviving entity shall be
                              organized in the United States; except that any
                              Subsidiary may merge with the Company (provided
                              that the Company shall be the surviving entity) or
                              with any one or more other Subsidiary.

                              EXHIBIT A - Page 2
<PAGE>

Sale of Assets           The Company will not sell, lease or transfer or
                         otherwise dispose of all or a substantial part of its
                         assets (defined to be in excess of 15% of Consolidated
                         Total Assets at the time of the sale), other than in
                         the ordinary course of business in any given fiscal
                         year and provided that such sale of substantial assets
                         on a cumulative basis shall not exceed 35% of
                         Consolidated Total Assets at the time of the sale,
                         except that: (x) any Subsidiary, other than the
                         Company, may sell, lease, transfer or otherwise dispose
                         of its assets to the Company or any other Subsidiary;
                         and (y) the Company may sell, lease, transfer or
                         otherwise dispose of its assets in excess of the
                         limitations set forth above if the proceeds of such
                         sales are used within one year of such sale (i) to
                         purchase other property useful in the business of the
                         Company or any Subsidiary and/or (ii) to repay Senior
                         Indebtedness.

  Restricted Payments    The Company's Restricted Payments and those of its
                         Subsidiaries will be limited to the amount in the pool
                         (the "Pool"). The following amounts will be included in
                         the Pool: (1) 25% (or minus 100% in the case of a
                         deficit) of Consolidated Net Earnings for each
                         quarterly period subsequent to June 30, 2000, and (2)
                         all proceeds from the issuance or sale of shares of any
                         class of stock for the period. The Restricted Payments
                         for each quarterly period will be subtracted from the
                         Pool and the outstanding balance in the Pool will be
                         carried over to the next period.

  Other Covenants        The Issuer and Company will agree to observe certain
                         covenants including covenants as to transactions with
                         affiliates, payment of taxes, maintenance of business
                         lines, compliance with laws, maintenance of properties,
                         and delivery of financial statements.

-----------------------
Subordination            The Notes shall rank pari passu with the Company's
                         other senior subordinated obligations but shall be
                         subordinated and junior in right of payment to all
                         Senior Indebtedness. Furthermore, the Company agrees
                         not to create any class of obligations which is senior
                         to the Notes but expressly subordinated to the
                         Company's Senior Indebtedness.

                         If (i) the Company shall default in the payment of
                         principal, interest, or premium, if any, on any Senior
                         Indebtedness, or (ii) an event of default occurs which
                         shall permit the holders of Senior Indebtedness to
                         accelerate the maturity thereof, then:

                         (a)  during any period in which the holders of Senior
                              Indebtedness shall have accelerated the payment
                              thereof and shall be pursuing the remedies
                              available to them, or if the Company shall default
                              in the payment of interest, principal or premium,
                              if any, on any Senior Indebtedness, unless and
                              until such default in payment or event of default
                              shall have been cured or waived or shall cease to
                              exist, no payment shall be made on account of the
                              Notes; and

                         (b)  during any period not described in clause (a)
                              above, the holders of a majority of the unpaid
                              principal balance of Senior Indebtedness

                              EXHIBIT A - Page 3
<PAGE>

                              may block payments of principal and interest to
                              the holders of the Notes for a period not to
                              exceed 179 days. Unless and until the earliest to
                              occur of (x) such default in payment or event of
                              default being cured, waived, or ceasing to exist,
                              or (y) the commencement of the 179/th/ consecutive
                              day of payment blockage pursuant to the provisions
                              of this clause (b), no payment shall be made on
                              the Notes; provided, however, that (i) no more
                              than one blockage period under this clause (b) may
                              occur during any period of 360 consecutive days.

                         In the event of bankruptcy or insolvency of the
                         Company, all Senior Indebtedness shall be paid in full
                         before any payment shall be made on account of the
                         Notes. In any such bankruptcy event, any payment or
                         distribution which would otherwise be payable to the
                         holders of the Notes shall be paid or delivered
                         directly to the holders of Senior Indebtedness until
                         Senior Indebtedness has been paid in full.

                         Nothing contained in these provisions is intended to
                         affect the relative rights of the holders of the Notes
                         and other creditors of the Company (other than holders
                         of Senior Indebtedness) nor shall any of these
                         provisions prevent any holder of the Notes from
                         exercising all remedies otherwise permitted by
                         applicable law upon the occurrence of an event of
                         default under this agreement.

-----------------------
Events of Default        Events of Default will include the following:

                              i)   default in the payment of interest on the
                                   Notes for more than five business days;

                              ii)  default in the payment of principal or Make-
                                   Whole Premium on the Notes when due;

                              iii) default in the observance of any financial
                                   covenant;

                              iv)  default in the observance of any non-
                                   financial covenant which continues unremedied
                                   for 30 days;

                              v)   any representations or warranties shall be
                                   false or misleading in any material respect;

                              vi)  cross acceleration on other indebtedness of
                                   the Company or any Subsidiary in excess of
                                   $5,000,000; and

                              vii) certain events involving bankruptcy of the
                                   Company.

-----------------------
Noteholders' Rights upon
Event of Default         Upon the occurrence of any Event of Default described
                         in paragraph 1 or 2 above, any Noteholder may declare
                         its Notes immediately due and payable in an amount
                         equal to par plus accrued interest plus the Make-Whole
                         Premium, if any. Upon the occurrence of any Event of
                         Default described in paragraphs 3-6 above, the holder
                         or holders of a majority of the aggregate unpaid
                         principal amount may declare all of the Notes to be
                         immediately due and payable in an amount equal to par
                         plus accrued interest plus the Make-Whole Premium, if
                         any. Upon the occurrence of

                              EXHIBIT A - Page 4
<PAGE>

                              any Event of Default described in paragraph 7
                              above, all the Notes shall be immediately due and
                              payable in an amount equal to the outstanding
                              principal amount plus any interest accrued
                              thereon, plus the Make Whole Premium, if any (to
                              the full extent permitted by applicable law). The
                              holders of a majority of the aggregate unpaid
                              principal amount may rescind acceleration any time
                              within 90 days of the date thereof in the event
                              the Company shall have cured.
---------------------------
Governing Law                 The Notes will be governed by, and construed in
                              accordance with the laws of the State of New York.

---------------------------
Amendments                    Any provisions of the Notes may be amended or
                              waived with the written consent of the holders of
                              a majority of the aggregate principal amount of
                              Notes outstanding except that each Noteholder must
                              consent in writing to any amendment or waiver
                              which adversely affects the interest rate,
                              maturity, prepayment or redemption provisions, or
                              the percentage required to amend the Notes.

---------------------------
Expenses                      The Company will pay reasonable legal fees of
                              Investor's Counsel, whether or not the transaction
                              closes.

---------------------------
Definitions

  Capital Lease               Shall mean any lease of property which in
                              accordance with GAAP would be capitalized as a
                              liability on the lessee's balance sheet or for
                              which the amount of the asset and liability
                              thereunder as if so capitalized should be
                              disclosed in a note to such balance sheet.

  Consolidated Net Earnings   Shall mean the net earnings of the Company and its
                              Subsidiaries in accordance with GAAP, excluding
                              (i) extraordinary items and (ii) any equity
                              interest of the Company on the unremitted earnings
                              of any corporation not a Subsidiary.

  Consolidated Total Assets   Shall mean the total assets of the Company and its
                              Subsidiaries, determined on a consolidated basis
                              in accordance with GAAP.

  Consolidated Senior Debt    Shall mean, at any time, the sum of all Senior
                              Indebtedness of the Company and all of its
                              Subsidiaries outstanding at such time determined
                              on a consolidated basis.

  Consolidated Total Debt     Shall mean, at any time, the sum of all
                              Indebtedness of the Company and all of its
                              Subsidiaries outstanding at such time determined
                              on a consolidated basis.

                              EXHIBIT A - Page 5
<PAGE>

EBITDA                                 Shall mean, for the most recently ended
                                       period of four full fiscal quarters of
                                       the Company, the sum of:

                                   a)  Consolidated Net Earnings plus the
                                       aggregate amount which was deducted for
                                       such period for federal, state and local
                                       income and franchise taxes, interest
                                       expense, depreciation expense, and
                                       amortization expense; and

                                   b)  Without duplication, Pro Forma Operating
                                       Income, if any, for such period. Pro
                                       Forma Operating Income shall mean, for
                                       any date of determination, Consolidated
                                       Net Earnings with respect to each company
                                       acquired by the Company during the four
                                       quarters preceding the date as of which
                                       EBITDA is calculated plus the aggregate
                                       amount which was deducted for such period
                                       for federal, state and local income and
                                       franchise taxes, interest expense,
                                       depreciation expense, and amortization
                                       expense, in each case limited to amounts
                                       reported by the Company on Form 8-K to
                                       the Securities and Exchange Commission.

  GAAP                                 Shall mean generally accepted accounting
                                       principles as in effect from time to time
                                       in the United States of America.

  Indebtedness                         Shall mean all liabilities for borrowed
                                       money which, in accordance with GAAP,
                                       would be included in determining total
                                       liabilities, obligations in respect of
                                       any Capital Lease, and any guarantee of
                                       the foregoing, but shall exclude such
                                       liabilities, obligations and guarantees
                                       if owed or guaranteed by a Subsidiary to
                                       the Company or another Subsidiary or by
                                       the Company to a Subsidiary.

  Material Subsidiary                  Any Subsidiary comprising more than 5% of
                                       Consolidated Total Assets and any other
                                       Subsidiary that provides a guarantee to
                                       any Senior Indebtedness.

  Restricted Payments                  Shall mean any of the following: (1)
                                       payment or declaration of any dividend or
                                       any other distribution on account of any
                                       class of its stock (except dividends or
                                       stock splits payable solely in common
                                       stock of the Company), (2) redemptions,
                                       purchases, or other acquisitions (direct
                                       or indirect) of shares of the Company's
                                       stock, and (3) any optional prepayment of
                                       any Indebtedness of the Company or any
                                       Subsidiary ranking junior to the Notes.

  Senior Indebtedness                  Shall mean any Indebtedness which is not
                                       expressly subordinated to other
                                       Indebtedness of the Company provided such
                                       Indebtedness is incurred in compliance
                                       with the Senior Debt Leverage Ratio.

  Senior Subordinated Indebtedness     Shall mean the Notes and any other
                                       Indebtedness which, by its terms, shall
                                       be subordinated to any Senior
                                       Indebtedness.

                              EXHIBIT A - Page 6
<PAGE>

  Subsidiary                           Shall mean any corporation of which such
                                       first mentioned corporation at the time
                                       owns, directly or through any intervening
                                       medium, that number of shares of voting
                                       stock which has the power to elect a
                                       majority of the board of directors.

                              EXHIBIT A - Page 7

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