<PAGE>   1
                                                                    Exhibit 4(d)

                                 THIRD AMENDMENT
                                       TO
                    REVOLVING CREDIT AND TERM LOAN AGREEMENT

         THIS THIRD AMENDMENT TO REVOLVING CREDIT AND TERM LOAN AGREEMENT (the
"Amendment"), dated as of June 19, 1998, is made and entered into by and among
MPW Industrial Services Group, Inc. ("MPW Group"), MPW Industrial Services, Inc.
("MPW, Inc."), MPW Industrial Services, Ltd. ("MPW, Ltd."), MPW Management
Services Corp. ("MPW Corp."), Weston Engineering, Inc. ("Weston"), Aquatech
Environmental, Inc. ("Aquatech), ESI International, Inc. ("ESII"), ESI-North
Limited ("ESI"), and MPW Container Management Corp. ("Container Corp.", which,
together the foregoing entities, shall be referred to herein collectively as the
"Borrowers" and individually as a "Borrower"), Bank One, NA, a national banking
association ("Bank One"), National City Bank, a national banking association
("NCB"), and Bank One, NA, as Agent, acting in the manner and to the extent
described in the Agreement described herein.

                             BACKGROUND INFORMATION

         A. The Borrowers and the Banks entered into a certain Revolving Credit
and Term Loan Agreement dated as of December 10, 1997, as amended by (i) a First
Amendment to Revolving Credit and Term Loan Agreement, dated as of February 11,
1998, and (ii) a Second Amendment to Revolving Credit and Term Loan Agreement,
dated as of April 7, 1998 (such agreement, as so amended, being referred to
herein as the "Agreement").

         B. The Banks and the Borrowers desire to amend certain provisions of
the Agreement and to make a new Subsidiary a party to the Agreement and other
applicable Facility Documents, upon the terms and conditions set forth herein.

                                   PROVISIONS

         NOW, THEREFORE, in consideration of the foregoing, the mutual covenants
and agreements hereunder, and for other good and valuable consideration, the
receipt and sufficiency of which are hereby acknowledged, the Borrowers, the
Banks and the Agent hereby agree as follows:

         SECTION 1. Capitalized Terms. Except as otherwise provided for herein,
the capitalized terms used herein shall have the same meanings as set forth in
the Agreement.

         SECTION 2. Amendment to Agreement.

               (a)  Section 7.6(a) of the Agreement is hereby amended in its
entirety to provide as follows:
<PAGE>   2
                      (a) Consolidated Tangible Net Worth. Permit Consolidated
         Tangible Net Worth to be less than (i) $26,500,000 prior to April 6,
         1998, (ii) $25,000,000 as and after April 7, 1998 through and including
         June 18, 1998, (iii) $21,400,000 as and after June 19, 1998 through and
         including June 29, 1998, and (iii) $21,700,000 as and after June 30,
         1998, provided such amount shall increase (but not decrease by any
         losses) quarterly on the last day of each Fiscal Quarter by 50% of
         Consolidated Net Income (determined at the end of each Fiscal Quarter
         for such Fiscal Quarter), commencing with the Fiscal Quarter ending
         September 30, 1998.

               (b)  Section 7.6(c) of the Agreement is hereby amended in its
entirety to provide as follows:

                      (c) Coverage Ratio. Permit the Coverage Ratio to be less
         than 1.50 to 1.00. For purposes of determining Consolidated Net Income
         and Consolidated Interest Expense in calculating the Coverage Ratio,
         (x) the "Adjusted Pro Forma Results of Operations" of the Borrowers as
         of the end of each Fiscal Quarter that ended on or prior to December
         31, 1997 shall be utilized, and (y) the actual results of operations of
         the Borrowers as of the end of each Fiscal Quarter that ended or will
         end after December 31, 1997 shall be utilized. As used herein,
         "Adjusted Pro Forma Results of Operations" will be the same information
         that is presented by MPW Group in its Forms 10-K and 10-Q filings with
         the Securities and Exchange Commission in the section in such filings
         entitled "Management's Discussion and Analysis of Results of Operations
         and Financial Condition".

               (c)  Section 7.16 of the Agreement is hereby amended in its
entirety to provide as follows:

                      Derivatives Obligations. Except for interest rate swap
         transactions (in form and substance, and evidenced by documents,
         satisfactory to the Agent) in an aggregate amount not exceeding
         $5,000,000 at any time entered into with either or both Banks, incur
         any Derivatives Obligations.

         SECTION 3. Adjustment in Applicable Margins. As of July 1, 1998, the
Applicable Margins with respect to the determination of the Interest Rates with
respect to the Loans shall be adjusted as follows:

               (a)  the Applicable Margin for Revolving Credit Loans bearing
interest based on the Base Rate shall be -25 basis points;

               (b)  the Applicable Margin for Revolving Credit Loans bearing
interest based on the Eurodollar Rate shall be +125 basis points;


                                       -2-
<PAGE>   3
               (c) the Applicable Margin for Term Loans bearing interest based
on the Base Rate shall be +0 basis points; and

               (d) the Applicable Margin for Term Loans bearing interest based
on the Eurodollar Rate shall be +150 basis points.

Such adjusted Applicable Margins shall remain in effect until otherwise changed
in accordance with the terms of the Agreement.

         SECTION 4. Truth of Representations and Warranties; No Defaults. The
Borrowers hereby represent and warrant that the following are true and correct
as of the date of this Amendment:

                  (a) The representations and warranties of the Borrowers
         contained in Article V of the Agreement are true and correct on and as
         of the date of this Amendment as if made on and as of such date unless
         stated to relate to a specific earlier date;

                  (b) No Default nor Event of Default has occurred; and

                  (c) All financial information heretofore provided to the Banks
         and the Agent is true, accurate and complete in all material respects.

         SECTION 5. Reaffirmation of Liability; Furnishing of Information. The
Borrowers hereby reaffirm their liability to the Banks and Agent under the
Agreement and all other Facility Documents. In addition, (i) the Borrowers agree
that the Banks and the Agent have performed all of their respective obligations
under the Facility Documents and that neither Bank nor the Agent is in default
under any obligation any of them has or ever did have to the Borrowers under the
Facility Documents or any other agreement; and (ii) the Banks and the Agent have
received all information and documentation required to be delivered to them by
the Borrowers pursuant to the Facility Documents.

         SECTION 6. Effectiveness of Amendment. All of the terms, covenants and
conditions of, and the obligations of the Borrowers under, the Agreement and the
Facility Documents shall remain in full force and effect as amended hereby.

         SECTION 7. Consent to Acquisition. The Banks hereby consent to the
purchase by the Borrowers of the capital stock of Maintenance Concepts, Inc. and
the assets of Tank Management, Inc. pursuant to, and in accordance with, the
documentation and information previously furnished to the Banks. Such consent
shall include, without limitation, the consent required of the Banks pursuant
Section 2.11 of the Agreement.


                                       -3-
<PAGE>   4
         SECTION 8. Conditions to Banks' Obligations. The obligations of the
Banks to enter into this Amendment and be bound by the terms hereof, including
without limitation the giving of the consent set forth in Section 7 hereof, are
subject to the satisfaction of the following conditions precedent:

               (a) Additional Borrower. Maintenance Concepts, Inc., an Ohio
corporation, shall execute this Amendment to acknowledge and evidence (i) its
becoming a party to the Agreement as a "Borrower", and (ii) its liability to the
Banks under the Agreement and all other agreements and instruments executed by
the Borrower for the benefit of the Banks and/or the Agent in connection with
the Agreement, including the Facility Documents.

               (b) Delivery of Documents. The Agent shall have received, for the
benefit of the Banks, the following, each in form and substance satisfactory to
the Agent and its counsel:

                   (i) Second Amended and Restated Promissory Notes. Second
         Amended and Restated Revolving Credit Promissory Notes in the form of
         Exhibit A attached hereto and incorporated herein by reference, duly
         executed and delivered by the Borrowers, including Maintenance
         Concepts, Inc.;

                   (ii) Governing Documents of Maintenance Concepts, Inc. True
         and complete certified copies of the articles (certificate) of
         incorporation (formation), code of regulations (by-laws), operating
         agreement or other governing documents of Maintenance Concepts, Inc.,
         and a copy of the resolutions (in form and substance satisfactory to
         the Agent) of the Board of Directors (or other governing Person) of
         Maintenance Concepts, Inc. authorizing (i) the execution, delivery and
         performance of this Amendment, the Notes and the other Facility
         Documents, as applicable, (ii) the consummation of the transactions
         contemplated hereby and thereby, (iii) the borrowing and other
         financial transactions provided for in the Agreement, and (iv) the
         documents provided for in the Agreement, certified by the secretary or
         an assistant secretary (or other appropriate representative) of
         Maintenance Concepts, Inc. Such certificate shall state that the
         resolutions set forth therein have not been amended, modified, revoked
         or rescinded as of the date hereof;

                   (iii) Good Standing Certificate. A copy of a certificate
         dated as of a recent date from the Secretary of State, or other
         appropriate authority of such jurisdiction, evidencing the good
         standing (or comparable status) of Maintenance Concepts, Inc. in the
         jurisdiction of its incorporation (formation) and the State of Ohio;


                                       -4-
<PAGE>   5
                   (iv) Incumbency Certificate. A certificate of the secretary
         or an assistant secretary (or other appropriate representative) of
         Maintenance Concepts, Inc. as to the incumbency and signature of the
         officer(s) or other representatives of Maintenance Concepts, Inc.
         executing this Amendment, the Notes, the other Facility Documents and
         any certificate or other documents to be delivered pursuant hereto or
         thereto;

                   (v) Opinion Letter. Opinion letter of the Borrowers' legal
         counsel as to Maintenance Concepts, Inc.; and

                   (vi) Other Requirements. Such other certificates, documents
         and other items as the Banks or the Agent, in their reasonable
         discretion, deem necessary or desirable.

               (c) Representations and Warranties. The representations and
warranties made by the Borrowers in this Amendment shall be true and correct in
all material respects as of the date of this Amendment.

         SECTION 9. Applicable Law. This Amendment shall be deemed to be a
contract made under the laws of the State of Ohio and for all purposes shall be
construed in accordance with the laws of such state.

         SECTION 10. Severability. Any provision of this Amendment which is
prohibited or unenforceable in any jurisdiction shall, as to such jurisdiction,
be ineffective only to the extent of such prohibition or unenforceability,
without invalidating the remaining provisions hereof or affecting the validity
or enforceability of such provision in any other jurisdiction.

         SECTION 11. Counterparts. This Amendment may be executed in one or more
counterparts, each of which shall be deemed an original, but all of which
together shall constitute one and the same instrument.

         SECTION 12. Headings. The headings of the sections of this Amendment
are for convenience only and shall not affect the construction of this
Amendment.

         SECTION 13. Expenses. The Borrowers agree to pay all out-of-pocket
expenses (including reasonable fees and expenses of counsel) of the Agent and
the Banks incurred in connection with this Amendment.

         SECTION 14. Interpretation. This Amendment is to be deemed to have been
prepared jointly by the parties hereto, and any uncertainty or ambiguity
existing herein shall not be interpreted against any party but shall be
interpreted according to the rules for the interpretation of arm's length
agreements.


                                       -5-
<PAGE>   6
         SECTION 15. WAIVER OF JURY TRIAL. THE BANKS, THE AGENT AND THE
BORROWERS, AFTER CONSULTING OR HAVING HAD THE OPPORTUNITY TO CONSULT WITH
COUNSEL, KNOWINGLY, VOLUNTARILY AND INTENTIONALLY WAIVE ANY RIGHT ANY OF THEM
MAY HAVE TO A TRIAL BY JURY IN ANY LITIGATION BASED UPON OR ARISING OUT OF THE
AGREEMENT AS AMENDED BY THIS AMENDMENT, THE NOTES, THE OTHER FACILITY DOCUMENTS,
OR ANY RELATED INSTRUMENT OR AGREEMENT, OR ANY OF THE TRANSACTIONS CONTEMPLATED
THEREBY, OR ANY COURSE OF CONDUCT, DEALING, STATEMENTS (WHETHER ORAL OR
WRITTEN), OR ACTIONS OF ANY OF THEM. NEITHER THE BANKS, THE AGENT NOR THE
BORROWERS SHALL SEEK TO CONSOLIDATE, BY COUNTERCLAIM OR OTHERWISE, ANY ACTION IN
WHICH A JURY TRIAL HAS BEEN WAIVED WITH ANY OTHER ACTION IN WHICH A JURY TRIAL
CANNOT BE OR HAS NOT BEEN WAIVED. THESE PROVISIONS SHALL NOT BE DEEMED TO HAVE
BEEN MODIFIED IN ANY RESPECT OR RELINQUISHED BY THE BANKS, THE AGENT OR THE
BORROWERS EXCEPT BY A WRITTEN INSTRUMENT EXECUTED BY ALL OF THEM.

                   [Balance of Page Intentionally Left Blank]



                                       -6-
<PAGE>   7
         IN WITNESS WHEREOF, the parties hereto have caused this Agreement to be
executed by their duly authorized officers as of the date first written above.

BANKS:
Bank One, NA                                 National City Bank

By:  /s/ Thomas E. Redmond                   By: /s/ Brian T. Strayton
     --------------------------                --------------------------
Name:  Thomas E. Redmond                     Name: Brian T. Strayton
     --------------------------                --------------------------
Title: Vice President                        Title: Vice President
     --------------------------                --------------------------

AGENT:

Bank One, NA

By:  /s/ Thomas E. Redmond
     --------------------------                
Name:  Thomas E. Redmond
     --------------------------                
Title: Vice President
     --------------------------                

BORROWERS:

MPW Industrial Services Group, Inc.          MPW Industrial Services, Inc.

By:  /s/ Daniel P. Buettin                   By:  /s/ Daniel P. Buettin
     --------------------------                --------------------------
Name: Daniel P. Buettin                      Name: Daniel P. Buettin
     --------------------------                --------------------------
Title: Vice President and Chief              Title: Vice President and Chief
     --------------------------                --------------------------
          Financial Officer                             Financial Officer
     --------------------------                --------------------------

MPW Industrial Services, Ltd.                MPW Management Services Corp.

By:  /s/ Daniel P. Buettin                   By:  /s/ Daniel P. Buettin
     --------------------------                --------------------------
Name: Daniel P. Buettin                      Name: Daniel P. Buettin
     --------------------------                --------------------------
Title: Vice President and Chief              Title: Vice President and Chief
     --------------------------                --------------------------
          Financial Officer                             Financial Officer
     --------------------------                --------------------------

                                       -7-
<PAGE>   8
Weston Engineering, Inc.                      Aquatech Environmental, Inc.

By:  /s/ Daniel P. Buettin                    By: /s/ Peter G. Schumacher
     --------------------------                --------------------------
Name: Daniel P. Buettin                       Name: Peter G. Schumacher
     --------------------------                --------------------------
Title: Vice President and Chief               Title:  Vice President, Treasurer
     --------------------------                --------------------------
          Financial Officer                              and Assistant Secretary
     --------------------------                --------------------------

ESI International, Inc.                       ESI-North Limited

By:  /s/ Daniel P. Buettin                    By:  /s/ Daniel P. Buettin
     --------------------------                --------------------------
Name: Daniel P. Buettin                       Name: Daniel P. Buettin
     --------------------------                --------------------------
Title: Vice President and Chief               Title: Vice President and Chief
     --------------------------                --------------------------
          Financial Officer                              Financial Officer
     --------------------------                --------------------------

MPW Container Management Corp.

By:  /s/ Daniel P. Buettin
     --------------------------               
Name: Daniel P. Buettin
     --------------------------               
Title: Vice President and Chief
     --------------------------               
          Financial Officer
     --------------------------               


                                       -8-
<PAGE>   9
         Maintenance Concepts, Inc., an Ohio corporation, enters into this
Amendment to acknowledge and evidence (i) its becoming a party to the Agreement
as a "Borrower", and (ii) its liability to the Banks under the Agreement and all
other agreements and instruments executed by the Borrower for the benefit of the
Banks and/or the Agent in connection with the Agreement, including the Facility
Documents.

                                           Maintenance Concepts, Inc.

                                           By:  /s/ Daniel P. Buettin
                                              ------------------------------
                                           Name: Daniel P. Buettin
                                                ----------------------------
                                           Title: Vice President and Secretary
                                                  ----------------------------


                                       -9-
<PAGE>   10
                                    EXHIBIT A

         FORM OF SECOND AMENDED AND RESTATED REVOLVING CREDIT LOAN NOTES
<PAGE>   11
                           SECOND AMENDED AND RESTATED
                           REVOLVING CREDIT LOAN NOTE


$10,500,000.00                   Columbus, Ohio                  June 19, 1998


         Promise to Pay. Not later than December 31, 2000, for value received,
the undersigned, MPW Industrial Services Group, Inc., MPW Industrial Services,
Inc., MPW Industrial Services, Ltd., MPW Management Services Corp., Weston
Engineering, Inc., Aquatech Environmental, Inc., ESI International, Inc.,
ESI-North Limited, MPW Container Management Corp. and Maintenance Concepts, Inc.
(collectively, the "Borrowers"), jointly and severally, hereby promise to pay to
the order of Bank One, NA (the "Bank") or its assigns, as further provided
herein, the principal amount of Ten Million Five Hundred Thousand Dollars
($10,500,000) or, if such principal is less, the aggregate unpaid principal
amount of all Revolving Credit Loans made by the Bank to the Borrowers pursuant
to the Revolving Credit and Term Loan Agreement referred to below, together with
interest on the unpaid principal balance from time to time outstanding hereunder
until paid in full at the rates of interest determined in accordance with such
Revolving Credit and Term Loan Agreement. Such interest shall be due and payable
on the dates set forth in such Revolving Credit and Term Loan Agreement. Both
principal and interest are payable in federal funds or other immediately
available money of the United States of America at the main office of the Agent
(defined below) located at 100 East Broad Street, Columbus, Ohio 43215, or such
other address as the Agent may hereafter designate by notice to the Borrowers.

         Loan Agreement. This Second Amended and Restated Revolving Credit Loan
Note amends and restates in its entirety the Amended and Restated Revolving
Credit Loan Note dated April 7, 1998, in the original principal amount of
$10,500,000, executed by the Borrower and payable to the order of the Bank, and
is one of the Revolving Credit Loan Notes referred to in the Revolving Credit
and Term Loan Agreement among the Borrowers, the Bank, National City Bank and
Bank One, NA, as Agent (the "Agent"), dated as of December 10, 1997, as the same
may be amended, modified, supplemented, restated or replaced from time to time
(the "Agreement"), which Agreement, as so amended, is incorporated by reference
herein. This Second Amended and Restated Revolving Credit Loan Note evidences
the continuing indebtedness under the Agreement and is not to be construed as a
satisfaction or refinancing of such indebtedness. All capitalized terms used
herein shall have the same meanings as are assigned to such terms in the
Agreement. This Second Amended and Restated Revolving Credit Loan Note is
entitled to the benefits of and is subject to the terms, conditions and
provisions of the Agreement. The Agreement, among other things, contains
provisions for acceleration of the maturity hereof upon the happening of certain
stated events, and also for repayments and reborrowings on account of the
principal hereof prior to maturity upon the terms, conditions and provisions
specified therein.
<PAGE>   12
         The Borrowers and each endorser and any other party liable on this
Second Amended and Restated Revolving Credit Loan Note severally waive demand,
presentment, notice of dishonor and protest, and consent to any extension or
postponement of time of its payment without limit as to the number or period, to
any substitution, exchange or release of all or part of any collateral securing
this Second Amended and Restated Revolving Credit Loan Note, to the addition of
any party, and to the release or discharge of, or suspension of any rights and
remedies against, any person who may be liable for the payment of this Second
Amended and Restated Revolving Credit Loan Note.

         Setoff. Any and all moneys now or at any time hereafter owing to the
Borrowers from the holder hereof are hereby pledged for the security of this and
all other Debt from the Borrowers to the holder hereof, and may, upon the
occurrence and during the continuation of any Event of Default, be paid and
applied thereon whether such Debt be then due or is to become due, except for
(a) funds necessary to cover checks for the payment of taxes or employee
contributions in which the Borrowers have no beneficial interest issued to third
parties prior to the date any setoff is claimed by the Bank and (b) accounts
maintained, but not substantially overfunded, for the payment of taxes or
employee contributions in which the Borrowers have no beneficial interest.

BORROWERS:

MPW Industrial Services Group, Inc.             MPW Industrial Services, Inc.


By:__________________________                   By:__________________________

Name:_______________________                    Name:_______________________

Title: ________________________                 Title: ________________________


MPW Industrial Services, Ltd.                   MPW Management Services Corp.

By:__________________________                   By:__________________________

Name:_______________________                    Name:_______________________

Title: ________________________                 Title: ________________________

                       [signatures continued on next page]


                                   Page 2 of 3
<PAGE>   13
Weston Engineering, Inc.                         Aquatech Environmental, Inc.

By:__________________________                    By:__________________________

Name:_______________________                     Name:_______________________

Title: ________________________                  Title: ________________________


ESI International, Inc.                          ESI-North Limited

By:__________________________                    By:__________________________

Name:_______________________                     Name:_______________________

Title: ________________________                  Title: ________________________


MPW Container Management Corp.                   Maintenance Concepts, Inc.

By:__________________________                    By:__________________________

Name:_______________________                     Name:_______________________

Title: ________________________                  Title: ________________________


                                   Page 3 of 3
<PAGE>   14
                           SECOND AMENDED AND RESTATED
                           REVOLVING CREDIT LOAN NOTE


$4,500,000.00                     Columbus, Ohio                 June 19, 1998


         Promise to Pay. Not later than December 31, 2000, for value received,
the undersigned, MPW Industrial Services Group, Inc., MPW Industrial Services,
Inc., MPW Industrial Services, Ltd., MPW Management Services Corp., Weston
Engineering, Inc., Aquatech Environmental, Inc., ESI International, Inc.,
ESI-North Limited, MPW Container Management Corp. and Maintenance Concepts, Inc.
(collectively, the "Borrowers"), jointly and severally, hereby promise to pay to
the order of National City Bank (the "Bank") or its assigns, as further provided
herein, the principal amount of Four Million Five Hundred Thousand Dollars
($4,500,000) or, if such principal is less, the aggregate unpaid principal
amount of all Revolving Credit Loans made by the Bank to the Borrowers pursuant
to the Revolving Credit and Term Loan Agreement referred to below, together with
interest on the unpaid principal balance from time to time outstanding hereunder
until paid in full at the rates of interest determined in accordance with such
Revolving Credit and Term Loan Agreement. Such interest shall be due and payable
on the dates set forth in such Revolving Credit and Term Loan Agreement. Both
principal and interest are payable in federal funds or other immediately
available money of the United States of America at the main office of the Agent
(defined below) located at 100 East Broad Street, Columbus, Ohio 43215, or such
other address as the Agent may hereafter designate by notice to the Borrowers.

         Loan Agreement. This Second Amended and Restated Revolving Credit Loan
Note amends and restates in its entirety the Amended and Restated Revolving
Credit Loan Note dated April 7, 1998, in the original principal amount of
$4,500,000, executed by the Borrower and payable to the order of the Bank, and
is one of the Revolving Credit Loan Notes referred to in the Revolving Credit
and Term Loan Agreement among the Borrowers, the Bank, Bank One, NA and Bank
One, NA, as Agent (the "Agent"), dated as of December 10, 1997, as the same may
be amended, modified, supplemented, restated or replaced from time to time (the
"Agreement"), which Agreement, as so amended, is incorporated by reference
herein. This Second Amended and Restated Revolving Credit Loan Note evidences
the continuing indebtedness under the Agreement and is not to be construed as a
satisfaction or refinancing of such indebtedness. All capitalized terms used
herein shall have the same meanings as are assigned to such terms in the
Agreement. This Second Amended and Restated Revolving Credit Loan Note is
entitled to the benefits of and is subject to the terms, conditions and
provisions of the Agreement. The Agreement, among other things, contains
provisions for acceleration of the maturity hereof upon the happening of certain
stated events, and also for repayments and reborrowings on account of the
principal hereof prior to maturity upon the terms, conditions and provisions
specified therein.
<PAGE>   15
         The Borrowers and each endorser and any other party liable on this
Second Amended and Restated Revolving Credit Loan Note severally waive demand,
presentment, notice of dishonor and protest, and consent to any extension or
postponement of time of its payment without limit as to the number or period, to
any substitution, exchange or release of all or part of any collateral securing
this Second Amended and Restated Revolving Credit Loan Note, to the addition of
any party, and to the release or discharge of, or suspension of any rights and
remedies against, any person who may be liable for the payment of this Second
Amended and Restated Revolving Credit Loan Note.

         Setoff. Any and all moneys now or at any time hereafter owing to the
Borrowers from the holder hereof are hereby pledged for the security of this and
all other Debt from the Borrowers to the holder hereof, and may, upon the
occurrence and during the continuation of any Event of Default, be paid and
applied thereon whether such Debt be then due or is to become due, except for
(a) funds necessary to cover checks for the payment of taxes or employee
contributions in which the Borrowers have no beneficial interest issued to third
parties prior to the date any setoff is claimed by the Bank and (b) accounts
maintained, but not substantially overfunded, for the payment of taxes or
employee contributions in which the Borrowers have no beneficial interest.


BORROWERS:

MPW Industrial Services Group, Inc.              MPW Industrial Services, Inc.


By:__________________________                    By:__________________________

Name:_______________________                     Name:_______________________

Title: ________________________                  Title: ________________________


MPW Industrial Services, Ltd.                    MPW Management Services Corp.

By:__________________________                    By:__________________________

Name:_______________________                     Name:_______________________

Title: ________________________                  Title: ________________________

                       [signatures continued on next page]


                                   Page 2 of 3
<PAGE>   16
Weston Engineering, Inc.                       Aquatech Environmental, Inc.

By:__________________________                  By:__________________________

Name:_______________________                   Name:_______________________

Title: ________________________                Title: ________________________


ESI International, Inc.                        ESI-North Limited

By:__________________________                  By:__________________________

Name:_______________________                   Name:_______________________

Title: ________________________                Title: ________________________


MPW Container Management Corp.                 Maintenance Concepts, Inc.

By:__________________________                  By:__________________________

Name:_______________________                   Name:_______________________

Title: ________________________                Title: ________________________


                                   Page 3 of 3