EXHIBIT 10.6.3
                                                            --------------
                                                         Ref. No. 582-07596

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                                UNCONDITIONAL GUARANTY


          FOR VALUE RECEIVED, and in order to induce MERRILL LYNCH BUSINESS
          FINANCIAL SERVICES  INC. ("MLBFS") to advance moneys or extend or
          continue to extend credit to or for the benefit of, or modify its
          credit relationship  with AMERICAN  ECO/SP CORPORATION (with  any
          successor-in-interest,   including,   without   limitation,   any
          successor by merger  or by operation of law,  herein collectively
          referred to as  "Customer"), under: (a)  that certain WCMA  NOTE,
          LOAN  AND  SECURITY AGREEMENT  NO.  582-07596  between MLBFS  and
          Customer (the "Loan Agreement"), (b) any "Additional Agreements",
          as that term is defined in the Loan Agreement (including, without
          limitation,  the NOTE  incorporated  by reference  into the  Loan
          Agreement), and (c)  all present and future  amendments and other
          evidences  of  any  extensions,  increases,  renewals  and  other
          changes  of or  to  the Loan  Agreement or  Additional Agreements
          (collectively, the  "Guaranteed Documents"),  and for  other good
          and valuable consideration, the  receipt and sufficiency of which
          is hereby acknowledged, THE UNDERSIGNED  C.A. TURNER MAINTENANCE,
          INC.,  a corporation organized and existing under the laws of the
          State of Texas  ("Guarantor"), HEREBY UNCONDITIONALLY  GUARANTEES
          TO  MLBFS  (i)  the   prompt  and  full  payment  when   due,  by
          acceleration  or otherwise, of all sums now or any time hereafter
          due from Customer to  MLBFS under the Guaranteed  Documents; (ii)
          the  prompt,  full  and  faithful performance  and  discharge  by
          Customer of  each  and  every  other  covenant  and  warranty  of
          Customer set  forth in  the Guaranteed  Documents, and (iii)  the
          prompt   and  full   payment   and  performance   of  all   other
          indebtedness, liabilities and obligations  of customers to MLBFS,
          howsoever  created  or  evidenced  and whether  now  existing  or
          hereafter arising  (collectively, the "Obligations").   Guarantor
          further  agrees   to  pay  all  reasonable   costs  and  expenses
          (including,  but  not  limited  to, court  costs  and  reasonable
          attorneys'  fees) paid  or  incurred by  MLBFS in  endeavoring to
          collect or enforce performance  of any of the Obligations,  or in
          enforcing this Guaranty.  

          This Guaranty is absolute, unconditional and continuing and shall
          remain in effect  until all  of the Obligations  shall have  been
          fully paid,  performed and discharged.   Upon the  occurrence and
          during the continuance of  any default or Event of  Default under
          the Guaranteed Documents, any  or all of the  indebtedness hereby
          guaranteed then  existing shall, at  the option of  MLBFS, become
          immediately due and payable  from Guarantor.  Notwithstanding the
          occurrence of any  such event, this  Guaranty shall continue  and
          remain in full force and effect.

          The  liability  of  Guarantor  hereunder  shall  in  no  event be
          affected or impaired by any of the following, any of which may be
          done or  omitted by MLBFS from time to time, without notice to or
          the  consent  of  Guarantor:     (a)  any  renewals,  amendments,
          modifications  or supplements  of  or to  any  of the  Guaranteed
          Documents,  or  any  extensions,  forbearances,   compromises  or
          releases  of any of the Obligations or any of MLBFS' rights under
          any of the Guaranteed  Documents; (b) any acceptance by  MLBFS of
          any  collateral or security for,  or other guarantors  of, any of
          the Obligations; (c) any failure, neglect or omission on the part
          of MLBFS  to realize upon  or protect any of  the Obligations, or
          any collateral or security therefor, or to exercise any lien upon
          or right of appropriation  of any moneys, credits or  property of
          Customer or  any  other  guarantor,  possessed by  or  under  the
          control of MLBFS or any of its affiliates, toward the liquidation
          or reduction of  the Obligations; (d) any application of payments
          or credits by MLBFS; (e) the granting of credit from time to time
          by  MLBFS to Customer  in excess of  the amount set  forth in the
          Guaranteed  Documents;  or (f)  any  other act  or  commission or
          omission of any kind or at any time upon the part of MLBFS or any
          of  its affiliates or any of their respective employees or agents
          with  respect to  any  matter whatsoever.    MLBFS shall  not  be
          required  at any time, as a  condition of Guarantor's obligations
          hereunder, to resort to payment from Customer or other persons or
          entities whatsoever, or  any of their  properties or estates,  or
          resort to any collateral or pursue or exhaust any other rights or
          remedies whatsoever.  

          No  release  or  discharge in  whole  or  in  part of  any  other
          guarantor of the Obligations shall release or discharge Guarantor
          unless and until  all of  the Obligations shall  have been  fully
          paid and  discharged.   Guarantor  expressly waives  presentment,
          protest,  demand,  notice  of  dishonor  or  default,  notice  of
          acceptance of this Guaranty, notice of advancement of funds under
          the Guaranteed Documents and all other notices and formalities to
          which Customer  or  Guarantor might  be entitled,  by statute  or
          otherwise, and, so long as there  are any Obligations or MLBFS is
          committed  to extend  credit  to Customer,  waives  any right  to
          revoke  or terminate  this Guaranty  without the  express written
          consent of MLBFS.

          So  long as there any  Obligations, Guarantor shall  not have any
          claim,   remedy   or   right   of   subrogation,   reimbursement,
          exoneration,  contribution,  indemnification or  participation in
          any  claim, right,  or remedy  of MLBFS  against Customer  or any
          security which MLBFS  now has or  hereafter acquires, whether  or
          not such claim, right or remedy arises in equity, under contract,
          by statute, under common law, or otherwise.

          MLBFS  is hereby irrevocably authorized by  Guarantor at any time
          during  the continuance  of an  Event of  Default under  the Loan
          Agreement  or any other of the Guaranteed Documents or in respect
          of any of  the Obligations,  in its sole  discretion and  without
          demand or notice of  any kind, to appropriate, hold, set  off and
          apply toward the  payment of  any amount due  hereunder, in  such
          order  of application  as  MLBFS may  elect,  all cash,  credits,
          deposits,  accounts,   securities  and  any  other   property  of
          Guarantor which is in transit to or in the possession, custody or
          control  of  MLBFS  or  Merrill  Lynch,  Pierce,  Fenner &  Smith
          Incorporated  ("MLPF&S"), or  any  of  their  respective  agents,
          bailees  or  affiliates,   including,  without  limitation,   all
          securities  accounts  with MLPF&S  and  all  cash and  securities
          therein  or   controlled  thereby,  and   all  proceeds  thereof.
          Guarantor  hereby  collaterally assigns  and  grants  to MLBFS  a
          security interest in all such property as additional security for
          the Obligations.  Upon the  occurrence and during the continuance
          of  an Event  of Default,  MLBFS shall  have  all rights  in such
          property  available to collateral  assignees and  secured parties
          under  all applicable  laws, including,  without limitation,  the
          UCC.

          Guarantor agrees  to furnish to MLBFS  such financial information
          concerning  Guarantor as may be required by any of the Guaranteed
          Documents  or as MLBFS may otherwise from time to time reasonably
          request.   Guarantor further  hereby irrevocably authorizes MLBFS
          and each of its  affiliates, including without limitation MLPF&S,
          to at  any time (whether  or not an  Event of Default  shall have
          occurred)  obtain from  and disclose  to each  other any  and all
          financial and other information about Guarantor.

          No delay  on the part of  MLBFS in the  exercise of any  right or
          remedy under  any agreement (including, but not  limited to, this
          Guaranty)  shall  operate  as  a  waiver  thereof,  and,  without
          limiting  the  foregoing, no  delay  in  the enforcement  of  any
          security  interest, and no single or partial exercise by MLBFS of
          any  right or remedy shall preclude any other or further exercise
          thereof  or the  exercise  of any  other right  or remedy.   This
          Guaranty may be executed  in any number of counterparts,  each of
          which counterparts,  once they are executed  and delivered, shall
          be deemed to be  an original and all of which counterparts, taken
          together, shall constitute but  one and the same Guaranty.   This
          Guaranty shall be binding  upon Guarantor and its successors  and
          assigns,  and shall  inure  to  the  benefit  of  MLBFS  and  its
          successors  and assigns.  If there are more than one guarantor of
          the  Obligations,  all  of  the  obligations  and  agreements  of
          Guarantor are joint and several with such other guarantors.

          This  Guaranty shall  be  governed by  the laws  of the  State of
          Illinois.  GUARANTOR AGREES THAT THIS GUARANTY MAY BE ENFORCED BY
          MLBFS IN ANY JURISDICTION  AND VENUE IN WHICH THE  LOAN AGREEMENT
          MAY BE ENFORCED.  GUARANTOR AND MLBFS HEREBY EACH EXPRESSLY WAIVE
          ANY AND ALL RIGHTS TO  A TRIAL BY JURY IN ANY  ACTION, PROCEEDING
          OR  COUNTERCLAIM  BROUGHT BY  EITHER OF  THE PARTIES  AGAINST THE
          OTHER PARTY IN ANY WAY RELATED TO OR ARISING OUT OF THIS GUARANTY
          OR THE  OBLIGATIONS.   Wherever possible each  provision of  this
          Guaranty shall be interpreted  in such manner as to  be effective
          and  valid under  applicable law,  but if  any provision  of this
          Guaranty shall be prohibited  by or invalid under such  law, such
          provision  shall  be  ineffective  only  to  the  extent  of such
          prohibition of invalidity, without invalidating the remainder  of
          such  provision or the remaining provisions of this Guaranty.  No
          modification  or waiver of any of the provisions of this Guaranty
          shall be effective unless in writing and signed by both Guarantor
          and an  officer of MLBFS.  Each  signatory on behalf of Guarantor
          warrants  that he  or  she has  authority  to sign  on  behalf of
          Guarantor, and by so signing, to bind Guarantor hereunder.


          Dated as of August 26, 1996.

          C.A. TURNER MAINTENANCE, INC.



          By: /s/ Michael E. McGinnis
              --------------------------------------------------------
                    Signature (1)                 Signature (2)



              Michael E. McGinnis
          ------------------------------------------------------------
                    Printed Name                  Printed Name



              Chairman
          ------------------------------------------------------------
                    Title                         Title


          Address of Guarantor:
               6201 Procter Street
               Port Arthur, TX 77643


          <PAGE>


          MERRILL LYNCH
          =================================================================

                               CERTIFICATE OF SECRETARY
                                      (GUARANTY)

          THE  UNDERSIGNED  CERTIFIES  that  the undersigned  is  the  duly
          appointed and  acting Secretary (or Assistant  Secretary) of C.A.
          TURNER MAINTENANCE,  INC., a corporation duly  organized, validly
          existing  and in  good standing  under the laws  of the  State of
          Texas; that  the  following  is a  true,  accurate  and  compared
          transcript of  resolutions duly, validly and  lawfully adopted on
          the  __________ day of  _________________, 1996  by the  Board of
          Directors of said corporation acting in accordance with the  laws
          of the state of incorporation and the charter and by-laws of said
          corporation:

          "RESOLVED, that it is advisable and in the  best interests and to
          the  benefit of this  Corporation to guaranty  the obligations of
          AMERICAN  ECO/SP  CORPORATION   ("Customer")  to  MERRILL   LYNCH
          BUSINESS FINANCIAL SERVICES INC. ("MLBFS"); and

          "FURTHER  RESOLVED,  that  the  President,  any  Vice  President,
          Treasurer, Secretary or other officer of this Corporation, or any
          one or more of them, be and each of them hereby is authorized and
          empowered for and on  behalf of this Corporation to:  (a) execute
          and deliver  to  MLBFS:  (i)  an Unconditional  Guaranty  of  the
          obligations of  Customer, (ii) any other  agreements, instruments
          and  documents   required  by  MLBFS   in  connection  therewith,
          including,  without limitation,  any agreements,  instruments and
          documents evidencing  liens or security interests  on any present
          or future amendments to any of the foregoing; all in such form as
          such  officer  shall  approve,  as  evidenced  by  his  signature
          thereon; and (b) to do and perform all such acts and things deemed
          by any such officer to be necessary or advisable to carry out and
          perform the  undertakings and agreements of  this Corporation set
          forth  therein;  and all  prior acts  of  said officers  in these
          premises are hereby ratified and confirmed; and

          "FURTHER RESOLVED,  that  MLBFS is  authorized to  rely upon  the
          foregoing  resolutions until  it receives  written notice  of any
          change or revocation, which change or revocation shall not in any
          event affect the obligations of  this Corporation with respect to
          any transaction committed  to by  MLBFS or  having its  inception
          prior to the receipt of such notice by MLBFS."

          THE UNDERSIGNED  FURTHER CERTIFIES that the foregoing resolutions
          have not been rescinded,  modified or repealed in any  manner and
          are in  full force and effect as of the date of this Certificate,
          and that the following  individuals are now the duly  elected and
          acting officers of said corporation:

               President:  /s/ Michael E. McGinnis
                          ---------------------------------------

               Vice President: 
                               ----------------------------------

               Secretary:  /s/ John D. Walker
                          ---------------------------------------

               Treasurer: 
                          ---------------------------------------

          IN WITNESS WHEREOF, the undersigned has executed this Certificate
          and  has affixed the seal of said corporation hereto, pursuant to
          due authorization, all as of this 27 day of August, 1996.


          (Corporate Seal)           /s/ John D. Walker
                                    -----------------------------
                                        Secretary

                                     John D. Walker
                                    -----------------------------
                                        Printed Name