Document:

<PAGE>   1
                                                                    EXHIBIT 10.1

                              AMENDMENT NUMBER TWO
                         TO LOAN AND SECURITY AGREEMENT

                  THIS AMENDMENT NUMBER TWO TO LOAN AND SECURITY AGREEMENT (this
"Amendment") dated as of November 13, 2000, is entered into among PHONETEL
TECHNOLOGIES, INC., an Ohio corporation ("Phonetel"), CHEROKEE COMMUNICATIONS,
INC., a Texas corporation ("Cherokee," and together with Phonetel, each a
"Borrower" and collectively, jointly and severally, the "Borrowers"), on the one
hand, and, on the other hand, Agent (as hereinafter defined) and the financial
institutions (collectively, the "Lenders" and individually, a "Lender") that are
signatories to that certain Loan and Security Agreement, dated as of November
17, 1999 (as amended, restated, supplemented, or otherwise modified from time to
time, the "Loan Agreement"), entered into among the Borrowers, Lenders, and
FOOTHILL CAPITAL CORPORATION, a California corporation, as agent for the Lenders
(herein, in such capacity, referred to as "Agent"), in light of the following:

                                    RECITALS

                  A. Borrowers have requested that the Lenders amend the Loan
Agreement.

                  B. Lenders are willing to amend the Loan Agreement under the
terms and conditions set forth in this Amendment.

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

         1. DEFINITIONS. Capitalized terms not otherwise defined herein shall
have the meaning ascribed thereto in the Loan Agreement.

         2. AMENDMENTS TO THE LOAN AGREEMENT. Upon the Second Amendment
Effective Date, the parties agree to amend the Loan Agreement as follows:

                  (a) SECTION 1.1 of the Loan Agreement hereby is amended by
inserting the following new defined terms in the proper alphanumerical order:

                  "SECOND AMENDMENT" means that certain Amendment Number Two to
         Loan and Security Agreement, dated as of November 13, 2000, among
         Borrowers, Lenders and Agent.

                  "SECOND AMENDMENT EFFECTIVE DATE" means the date that all
         conditions set forth in SECTION 3 of the Second Amendment have been
         satisfied.

                                      -1-
<PAGE>   2

                  (b) SECTION 2.11(e) of the Loan Agreement hereby is amended by
deleting the text "the first anniversary of the Closing Date" appearing in said
Section and inserting the text "January 1, 2001" in lieu thereof.

                  (c) SECTION 3.4 of the Loan Agreement hereby is amended by
deleting the text "November 17, 2001" appearing in said Section and inserting
the text "January 1, 2002" in lieu thereof.

         3. CONDITIONS PRECEDENT TO AMENDMENT. The satisfaction of each of the
following unless waived or deferred by Lenders, in their sole discretion, shall
constitute conditions precedent to the effectiveness of this Amendment and each
and every provisions hereof:

                  (a) Agent shall have received this Amendment, in form and
substance satisfactory to Agent, duly executed by each party hereto, and in full
force and effect;

                  (b) The representations and warranties in this Amendment, the
Loan Agreement as amended by this Amendment, and the other Loan Documents shall
be true and correct in all respects on and as of the date hereof, as though made
on such date (except to the extent that such representations and warranties
relate solely to an earlier date);

                  (c) No Default or Event of Default shall have occurred and be
continuing on the date hereof, nor shall result from the consummation of the
transactions contemplated herein; and

                  (d) No injunction, writ, restraining order, or other order of
any nature prohibiting, directly or indirectly, the consummation of the
transactions contemplated herein shall have been issued and remain in force by
any Governmental Authority against either of the Borrowers, Agent or any of the
Lenders.

         4. REPRESENTATIONS AND WARRANTIES. Each Borrower hereby represents and
warrants to the Lenders that (a) the execution, delivery, and performance of
this Amendment and of the Loan Agreement, as amended by this Amendment, are
within such Borrower's corporate powers, have been duly authorized by all
necessary corporate action, and are not in contravention of any law, rule, or
regulation, or any order, judgment, decree, writ, injunction, or award of any
arbitrator, court, or Governmental Authority, or of the terms of its Governing
Documents, or of any contract or undertaking to which it is a party or by which
any of its properties may be bound or affected, (b) this Amendment and the Loan
Agreement, as amended by this Amendment, constitute such Borrower's legal,
valid, and binding obligation, enforceable against such Borrower in accordance
with its terms, and (c) this Amendment has been duly executed and delivered by
such Borrower.

         5. CHOICE OF LAW. The validity of this Amendment, its construction,
interpretation and enforcement, the rights of the parties hereunder, shall be
determined under, governed by, and construed in accordance with the laws of the
State of New York.

                                      -2-
<PAGE>   3

         6. COUNTERPARTS; TELEFACSIMILE EXECUTION. This Amendment may be
executed in any number of counterparts and by different parties and separate
counterparts, each of which when so executed and delivered, shall be deemed an
original, and all of which, when taken together, shall constitute one and the
same instrument. Delivery of an executed counterpart of a signature page to this
Amendment by telefacsimile shall be effective as delivery of a manually executed
counterpart of this Amendment. Any party delivering an executed counterpart of
this Amendment by telefacsimile also shall deliver a manually executed
counterpart of this Amendment but the failure to deliver a manually executed
counterpart shall not affect the validity, enforceability, and binding effect of
this Amendment.

         7. EFFECT ON LOAN AGREEMENT. The Loan Agreement, as amended hereby,
shall be and remain in full force and effect in accordance with its respective
terms and hereby is ratified and confirmed in all respects. The execution,
delivery, and performance of this Amendment shall not operate as a waiver of or,
except as expressly set forth herein, as an amendment of, any right, power, or
remedy of Agent or any Lender under the Loan Agreement, as in effect prior to
the date hereof.

         8. FURTHER ASSURANCES. Each Borrower shall execute and deliver all
agreements, documents, and instruments, in form and substance satisfactory to
Agent, and take all actions as Agent may reasonably request from time to time,
to perfect and maintain the perfection and priority of Liens in the Collateral
held by Agent for the benefit of the Lenders and to fully consummate the
transactions contemplated under this Amendment and the Loan Agreement, as
amended by this Amendment.

         9. MISCELLANEOUS.

                  (a) Upon and after the effectiveness of this Amendment, each
reference in the Loan Agreement to "this Agreement", "hereunder", "herein",
"hereof" or words of like import referring to the Loan Agreement, and each
reference in the other Loan Documents to "the Loan Agreement", "thereunder",
"therein", "thereof" or words of like import referring to the Loan Agreement,
shall mean and be a reference to the Loan Agreement as modified and amended
hereby.

                  (b) The Loan Agreement and all other Loan Documents, are and
shall continue to be in full force and effect and are hereby in all respects
ratified and confirmed and shall constitute the legal, valid, binding and
enforceable obligations of each Borrower to Agent and Lenders.

                  [Remainder of page intentionally left blank]

                                      -3-
<PAGE>   4

                  IN WITNESS WHEREOF, the parties have entered into this
Amendment as of the date first above written.

                                        PHONETEL TECHNOLOGIES, INC.,
                                        an Ohio corporation

                                        By /s/John D. Chichester
                                           ---------------------------------
                                        Name: John D. Chichester
                                              ------------------------------
                                        Title: President and Chief Executive
                                               -----------------------------
                                               Officer
                                               -----------------------------

                                        CHEROKEE COMMUNICATIONS, INC.,
                                        a Texas corporation

                                        By /s/John D. Chichester
                                           ---------------------------------
                                        Name: John D. Chichester
                                              ------------------------------
                                        Title: President
                                               -----------------------------

                           [signature page continues]

<PAGE>   5

                                        FOOTHILL CAPITAL CORPORATION, a
                                        California corporation, as
                                        Agent and a Lender

                                        By /s/Andrew D. Hall
                                           -------------------------------
                                        Name: Andrew D. Hall
                                              ----------------------------
                                        Title: Senior Vice President, Loan
                                               ---------------------------
                                               Portfolio
                                               ---------------------------

                           [signature page continues]

                                      -2-
<PAGE>   6

                                        FOOTHILL PARTNERS III, L.P.,
                                        a Delaware limited partnership, as a
                                        Lender

                                        By /s/Jeff T. Nikora
                                           -----------------------------
                                        Name: Jeff T. Nikora
                                              --------------------------
                                        Title: Managing General Partner
                                               -------------------------

                           [signature page continues]

                                      -3-
<PAGE>   7

                                        ABLECO FINANCE LLC,
                                        a Delaware limited liability company,
                                        as a Lender and as agent for its
                                        successors and assigns

                                        By /s/Kevin Genda
                                           ---------------------------------
                                        Name: Kevin Genda
                                              ------------------------------
                                        Title: Senior Vice President, Chief
                                               -----------------------------
                                               Credit Officer
                                               -----------------------------

                                      -4-<PAGE>   1
                                                                    Exhibit 4(c)

                      SECOND AMENDMENT TO CREDIT AGREEMENT

         THIS SECOND AMENDMENT TO CREDIT AGREEMENT (the "Amendment"), dated as
of November 10, 2000 (the "Effective Date"), is entered into by and among MPW
Industrial Services Group, Inc. ("MPW Group"), Aquatech Environmental, Inc.,
each of the other Subsidiaries of MPW Group listed on the Schedule of Subsidiary
Borrowers attached hereto, the Lenders listed on the signature pages of this
Amendment, Bank One, NA, as Administrative Agent and LC Issuer, and National
City Bank, as Documentation Agent.

                             BACKGROUND INFORMATION

         A. Borrowers, Lenders, Administrative Agent, LC Issuer and
Documentation Agent entered into a certain Credit Agreement, dated as of October
20, 1999, as amended by a certain First Amendment to Credit Agreement and Other
Loan Documents, dated as of July 17, 2000 (the "First Amendment") (such credit
agreement, as so amended, the "Agreement").

         B. Lenders extended a revolving line of credit loan (the "Revolving
Loan") to Borrowers in the original maximum principal amount of $100 million
pursuant to the Agreement.

         C. The Aggregate Commitment was reduced from the maximum principal
amount of $100 million to the maximum principal amount of $70 million pursuant
to the request of Borrowers set forth in a letter to Administrative Agent, dated
August 30, 2000.

         D. Pursuant to the First Amendment, Lenders approved the entering into
by Borrowers of a Recapitalization Agreement (the "Recapitalization Agreement")
with certain investment partnerships affiliated with Robert W. Baird & Co.
Incorporated ("BCP"), whereby Pentagon Technologies Group, Inc. ("PTG"),
previously a Borrower under the Loan Documents, was merged with and into a newly
formed subsidiary of BCP (the "Merger"), with PTG as the surviving corporation
(PTG and the surviving corporation are hereinafter referred to as "Pentagon").
Pursuant to the Recapitalization Agreement and upon the consummation of the
Merger, Pentagon's issued and outstanding shares of Common Stock, which were
owned by MPW Management Services Corp., a subsidiary of MPW Group ("MSC"), were
converted into shares of New Series A Preferred Stock and New Common Stock of
Pentagon (the "New Shares"). Upon consummation of the Merger, Pentagon redeemed
certain of the New Shares held by MSC (the "Redemption", and, collectively with
the Merger and the transactions contemplated by the Recapitalization Agreement,
the "Sale"), and after consummation of the Sale, MSC now owns certain shares of
New Series A Preferred Stock and the New Common Stock of Pentagon, as described
in the First Amendment.

         E. In connection with the Sale, Borrowers incurred and reported an
extraordinary loss of $5,712,000 (the "Original Loss"), as shown in their
quarterly financial statements for their fiscal quarter ended March 31, 2000. In
calculating Consolidated EBIT in accordance with the terms of the Agreement,
Consolidated Interest Expense and expense for taxes paid or accrued are added
back to Consolidated Net Income, but extraordinary gains are not deducted from,
and extraordinary losses

<PAGE>   2

are not added back to, Consolidated Net Income. Pursuant to the First Amendment,
Lenders approved that the Original Loss could be added back when calculating
Consolidated EBIT.

         F. Borrowers have informed the Administrative Agent and Lenders that
the actual extraordinary loss incurred in connection with the Sale exceeded the
Original Loss by $1,535,000 (the "Additional Loss"). Borrowers have requested
that the Additional Loss, as well as some other expenses, be added back when
calculating Consolidated EBIT for purposes of calculating certain financial
covenants set forth in the Agreement, and Lenders are willing to consent to such
request, as well as other modifications to the Agreement, upon and subject to
the terms and conditions set forth herein.

                                   PROVISIONS

         NOW, THEREFORE, in consideration of their mutual agreements hereunder
and under the Agreement, and for other good and valuable consideration, the
receipt and sufficiency of which are hereby acknowledged, Borrowers,
Administrative Agent, Lenders, Documentation Agent and LC Issuer, hereby agree
as follows:

         1. CAPITALIZED TERMS. Except as otherwise defined herein, the
capitalized terms used herein shall have the same meanings as set forth in the
Agreement.

         2. AMENDMENT AND MODIFICATION OF THE AGREEMENT, THE SECURITY AGREEMENT
AND OTHER LOAN DOCUMENTS. On the Effective Date:

                  (a) CAPITAL EXPENDITURES. The limitation on Capital
         Expenditures by Borrowers and their Subsidiaries set forth in the
         Agreement shall be reduced (x) from $15,000,000 to $12,000,000 with
         respect to fiscal year 2001, and (y) from $17,500,000 to $15,000,000
         with respect to each fiscal year thereafter; and Section 6.16 of the
         Agreement shall be amended in its entirety to provide as follows:

                                    "6.16. CAPITAL EXPENDITURES. Each Borrower
                  will not, nor will it permit any Subsidiary to, expend, or be
                  committed to expend, in excess of the following amounts for
                  Capital Expenditures during any one fiscal year in the
                  aggregate for Borrowers and their Subsidiaries: (i)
                  $15,000,000 during fiscal year 2000; (ii) $12,000,000 during
                  fiscal year 2001; and (iii) $15,000,000 during any fiscal year
                  thereafter. "

                  (b) INTEREST COVERAGE RATIO. The ratio of Consolidated EBIT to
         Consolidated Interest Expense required to be maintained by Borrowers
         and their Subsidiaries as set forth in the Agreement shall be reduced
         from 2.5 to 1.0 to 2.1 to 1.0 for the fiscal quarters of Borrowers
         ending on September 30, 2000, December 31, 2000 and March 31, 2001; and
         Section 6.25.1 of the Agreement shall be amended in its entirety to
         provide as follows:

                                       2
<PAGE>   3

                           "6.25.1. INTEREST COVERAGE RATIO. The Borrowers will
                  not permit the ratio, determined as of the end of each of
                  their fiscal quarters for the then most-recently ended four
                  fiscal quarters, of (i) Consolidated EBIT to (ii) Consolidated
                  Interest Expense to be less than (x) 2.1 to 1.0 for such
                  fiscal quarters ending September 30, 2000, December 31, 2000,
                  and March 31, 2001, and (y) 2.5 to 1.0 thereafter."

         3. CALCULATION OF INTEREST COVERAGE RATIO FINANCIAL COVENANT. Lenders
hereby consent to allowing the following amounts, to the extent deducted in
determining Consolidated Net Income for any fiscal quarter, to be added back to
Consolidated EBIT for such fiscal quarter for the purpose of calculating the
ratio of Consolidated EBIT to Consolidated Interest Expense in each case where
the financial results for such fiscal quarter are included in determining
Consolidated EBIT pursuant to Section 6.25.1 of the Agreement:

                  (i)      the Original Loss;

                  (ii)     the Additional Loss;

                  (iii)    $560,000 in aggregate severance payments to former
                           officers of Borrowers; and

                  (iv)     $1,200,000 aggregate amount written off in accounts
                           receivable owed by account debtors to MPW Filtration
                           Management Services Corp.

         4. CALCULATION OF LEVERAGE RATIO FINANCIAL COVENANT. Lenders hereby
consent to allowing the amount of the Original Loss and the Additional Loss, to
the extent deducted in determining Consolidated Net Income for any fiscal
quarter, to be added back to Consolidated EBIT for such fiscal quarter for the
purpose of calculating the ratio of Consolidated Funded Indebtedness to
Consolidated EBITDA in each case where the financial results for such fiscal
quarter are included in determining Consolidated EBITDA pursuant to Section
6.25.2 of the Agreement.

         5. APPLICABLE MARGIN. From the Effective Date until the date the
Applicable Margin may be adjusted pursuant to the Agreement with respect to
financial information for the fiscal quarter of Borrowers ending March 31, 2001,
the Applicable Margin and the Applicable Fee Rate shall not be less than the
Applicable Margin and the Applicable Fee Rate applicable to Level Status IV as
set forth in the Pricing Schedule.

         6. CONDITIONS TO LENDER'S OBLIGATIONS. The obligations of
Administrative Agent, on behalf of Lenders, to enter into this Amendment, and
for Lenders to be bound by the terms hereof, are subject to the satisfaction of
the following conditions precedent:

                  (a) DELIVERY OF DOCUMENTS. On or prior to the date of this
         Amendment, Administrative Agent shall have received the following:

                           (i) a copy of the resolutions (in form and substance
                  satisfactory to Lender) of the board of directors of each
                  Borrower authorizing (A) the execution,

                                       3
<PAGE>   4

                  delivery and performance of this Amendment and all other
                  documents in connection herewith or therewith, as applicable,
                  and (B) the consummation of the transactions contemplated
                  hereby and thereby, certified by the secretary or an assistant
                  secretary (or other appropriate representative) of each
                  Borrower. Each such certificate shall state that the
                  resolutions set forth therein have not been amended, modified,
                  revoked or rescinded as of the date hereof; and

                           (ii) such other certificates, documents and other
                  items as Administrative Agent, in its reasonable discretion,
                  deems necessary or desirable.

                  (b) Borrowers shall pay to Administrative Agent, for the
         ratable benefit of Lenders, an amendment fee in the amount of $105,000.

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

         7. EXHIBITS AND SCHEDULES. Each Borrower confirms and warrants that the
information set forth in all schedules and exhibits to the Agreement is true,
accurate and complete as of the date hereof.

         8. TRUTH OF REPRESENTATIONS AND WARRANTIES; NO DEFAULTS. Each Borrower
hereby represents and warrants to Lenders and Administrative Agent that the
following are true and correct as of the date of this Amendment:

                  (a) the representations and warranties of each Borrower
         contained in 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, in which case they were true,
         correct and complete in all material respects on and as of such earlier
         date;

                  (b) all financial statements and information of Borrowers
         provided to Administrative Agent and Lenders are true, accurate and
         complete in all material respects as of the date of, and for the
         periods covered by, such financial statements and information;

                  (c) neither this Amendment nor any other document, certificate
         or written statement furnished to Administrative Agent and/or Lenders
         or to special counsel to Administrative Agent by or on behalf of any
         Borrower in connection with the transactions contemplated hereby
         contains any untrue statement of a material fact or omits to state a
         material fact necessary in order to make the statements contained
         herein and therein not misleading;

                  (d) each Borrower has full power and authority (i) to execute,
         deliver and perform this Amendment, and (ii) to incur the obligations
         provided for herein and therein, all of which have been duly authorized
         by all necessary and proper action by each Borrower;

                                       4
<PAGE>   5

                  (e) no consent, waiver or authorization of, or filing with,
         any person, entity or governmental authority is required to be made or
         obtained by any Borrower in connection with the execution, delivery,
         performance, validity or enforceability of this Amendment;

                  (f) this Amendment constitutes the legal, valid and binding
         obligation of Borrowers, enforceable against Borrowers in accordance
         with its terms;

                  (g) no Unmatured Default nor Default has occurred and is
         continuing; and

                  (h) the execution and delivery by Borrowers of this Amendment
         and the performance by Borrowers of this Amendment: (i) do not and will
         not violate any law or regulation; (ii) do not and will not violate any
         order, decree or judgment by which any Borrower is bound; (iii) do not
         and will not violate or conflict with, result in a breach of or
         constitute (with notice, lapse of time, or otherwise) a default under
         any material agreement, mortgage, indenture or other contractual
         obligation to which any Borrower is a party, or by which any Borrower's
         properties are bound; or (iv) do not and will not result in the
         creation or imposition of any lien upon any property or assets of any
         Borrower.

         9. REAFFIRMATION OF LIABILITY. Each Borrower hereby reaffirms its
liability to Lender under the Agreement, the Security Agreement, the Notes, the
other Loan Documents and all other agreements and instruments executed by
Borrowers for the benefit of Administrative Agent, Lenders, LC Issuer or
Documentation Agent in connection with the Agreement (collectively, the "Bank
Documents"). Without limiting the generality of the foregoing, each Borrower
reaffirms all of its payment obligations, including with respect to the
Revolving Loan under the Agreement and the Notes and with respect to the
Facility LCs. In addition, each Borrower agrees that Administrative Agent, each
Lender, LC Issuer and Documentation Agent have performed all of their
obligations under the Bank Documents and that none of Administrative Agent, any
Lender, LC Issuer or Documentation Agent is in default under any obligation any
of them has or ever did have to any Borrower under the Bank Documents or any
other agreement.

         10. EFFECTIVENESS OF AMENDMENT. All of the terms, covenants and
conditions of, and the obligations of Borrowers under, the Bank Documents shall
remain in full force and effect as amended hereby.

         11. PRESERVATION OF EXISTING SECURITY INTERESTS. Each mortgage,
security interest, pledge, assignment, lien or other conveyance or encumbrance
of any right, title, or interest in any property of any kind delivered to
Administrative Agent for the benefit of Lenders at any time by any Borrower or
any other Person in connection with the Bank Documents or to secure the
performance of the obligations of Borrowers under the Bank Documents, including
pursuant to the Security Agreement, shall remain in full force and effect
following the execution of this Amendment.

         12. 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.

                                       5
<PAGE>   6

         13. SEVERABILITY. Any provision of this Amendment that 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.

         14. 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.

         15. AMENDMENTS AND SUPPLEMENTS. This Amendment may not be amended or
supplemented except by an instrument in writing executed by Borrowers and Agent.

         16. COVENANTS TO SURVIVE, BINDING AGREEMENT. This Amendment shall be
binding upon and inure to the benefit of Borrowers, Lenders, Administrative
Agent, LC Issuer and Documentation Agent and their respective successors or
assigns; provided, however, that Borrowers may not assign or otherwise dispose
of any of their rights or obligations hereunder.

         17. ENTIRE AGREEMENT. This Amendment embodies the entire agreement and
understanding among Borrowers, Administrative Agent, Lenders, Documentation
Agent and LC Issuer relating to, and supersedes all prior agreements and
understandings among Borrowers, Administrative Agent, Lenders, Documentation
Agent and LC Issuer relating to, the subject matter hereof.

         18. HEADINGS. The headings of the sections of this Amendment are for
convenience only and shall not affect the meaning or interpretation of this
Amendment.

         19. 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.

         20. WAIVER OF JURY TRIAL. EACH BORROWER, ADMINISTRATIVE AGENT,
DOCUMENTATION AGENT, LC ISSUER AND EACH LENDER HEREBY WAIVE TRIAL BY JURY IN ANY
JUDICIAL PROCEEDING INVOLVING, DIRECTLY OR INDIRECTLY, ANY MATTER (WHETHER
SOUNDING IN TORT, CONTRACT OR OTHERWISE) IN ANY WAY ARISING OUT OF, RELATED TO,
OR CONNECTED WITH ANY LOAN DOCUMENT OR THE RELATIONSHIP ESTABLISHED THEREUNDER.

                                       6
<PAGE>   7

         IN WITNESS WHEREOF, the parties hereto have made this Amendment
effective as of the day and year first above written.

                                       BORROWERS:

                                       MPW Industrial Services Group, Inc.

                                       By: /s/ Ira O. Kane
                                          ------------------------------------
                                          Ira O. Kane, President and Chief
                                                Operating Officer

                                       Aquatech Environmental, Inc.

                                       By: /s/ Peter G. Schumacher
                                          ------------------------------------
                                          Peter G. Schumacher, Vice President
                                                and Treasurer

                                       Each of the Other Borrowers Listed
                                       on the Schedule of Subsidiary Borrowers

                                       By: /s/ Ira O. Kane
                                          ------------------------------------
                                          Ira O. Kane, President and Chief
                                                Operating Officer

 [Signatures of Lenders, Administrative Agent, LC Issuer and Documentation Agent
                          Continued on Following Pages]

                                       7
<PAGE>   8

                                       BANK ONE, NA,
                                       as a Lender and as Administrative Agent
                                       and LC Issuer

                                       By: /s/ Thomas E. Redmond
                                          ------------------------------------

                                       Name: Thomas E. Redmond
                                            ----------------------------------

                                       Title: Managing Director
                                             ---------------------------------

                                       8
<PAGE>   9

                                       NATIONAL CITY BANK,
                                       as a Lender and as Documentation Agent

                                       By: /s/ Brian T. Strayton
                                          --------------------------------------

                                       Name: Brian T. Strayton
                                            ------------------------------------

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

                                       9
<PAGE>   10

                                       LASALLE BANK NATIONAL ASSOCIATION

                                       By: /s/ Bijon Talaie
                                          -----------------------------------

                                       Name: Bijon Talaie
                                            ---------------------------------

                                       Title: Assistant Vice President
                                             --------------------------------

                                       10
<PAGE>   11

                                       SUNTRUST BANK

                                       By: /s/ Stephen L. Leister
                                          ----------------------------------

                                       Name: Stephen L. Leister
                                            --------------------------------

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

                                       11
<PAGE>   12

                        SCHEDULE OF SUBSIDIARY BORROWERS

MPW Industrial Services, Inc.
MPW Management Services Corp.
MPW Filtration Management Services Corp.
MPW Industrial Water Services, Inc.
MPW Container Management Corp.
MPW Container Management Corp. of Michigan
ESI International, Inc.
ESI-North Limited
Gauthier Enterprises, Inc.
MPW Industrial Services of Indiana, LLC
MPW Industrial Cleaning Corp.

                                       12
<PAGE>   13

                       CONSENT AND AGREEMENT OF GUARANTORS

         Each of the undersigned, MPW Industrial Services, Ltd. and MPW
Industrial, Sociedad de Responsibilidad Limitada de Capital Variable (the
"Guarantors"), being a guarantor pursuant to the Subsidiary Guaranty dated as of
October 20, 1999 in favor of Lenders (the "Guaranty") whereby each of Guarantors
has guaranteed the payment and performance of Borrowers' obligations and
indebtedness owed to Lenders, joins in the execution of this Amendment and
hereby consents and agrees to the terms, conditions, execution and performance
of the this Amendment. Each of Guarantors has read and understands all terms and
provisions of the Guaranty, the Bank Documents and this Amendment, and agrees
that all of the terms, covenants and conditions of, and the obligations of each
of Guarantors under, the Guaranty shall continue in full force and effect and be
binding upon Guarantors.

         Each of Guarantors represents and warrants that all representations and
warranties contained in the Guaranty are true, correct and complete in all
material respects on and as of the date hereof to the same extent as though made
on and as of this date, except to the extent such representations and warranties
specifically relate to an earlier date, in which case they were true, correct
and complete in all material respects on and as of such earlier date.

         Each of Guarantors hereby reaffirms its liability to Lenders under the
Guaranty and all other agreements and instruments executed by each of Guarantors
for the benefit of Lenders in connection therewith. Each of Guarantors agrees
that Administrative Agent, each Lender, LC Issuer and Documentation Agent have
performed all of their obligations under the Bank Documents and that none of
Administrative Agent, any Lender, LC Issuer or Documentation Agent is in default
under any obligation any of them has or ever did have to either of Guarantors
under the Guaranty or the other Bank Documents or any other agreement.

         Each of Guarantors acknowledges and agrees that (i) notwithstanding the
conditions to effectiveness set forth in this Amendment, each of Guarantors is
not required by the terms of the Guaranty or any other Bank Document to consent
to the terms of this Amendment, and (ii) nothing in the Guaranty, this Amendment
or any other Bank Document shall require, or be deemed to require, the consent
of either of Guarantors to any future amendments to any Bank Document.

GUARANTOR:                          GUARANTOR:

MPW Industrial Services, Ltd.       MPW Industrial, Sociedad de
                                    Responsibilidad Limitada de Capital Variable
By: /s/ Ira O. Kane
   ---------------------------------
    Ira O. Kane, President and Chief
    Operating Officer               By: /s/ Ira O. Kane
                                       ---------------------------------
                                        Ira O. Kane, President and Chief
                                        Operating Officer

                                       13

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