ATC GROUP SERVICES INC /DE/
SC 14D1, 1997-12-04
TESTING LABORATORIES
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<PAGE>
 
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- -------------------------------------------------------------------------------
 
                      SECURITIES AND EXCHANGE COMMISSION
                            WASHINGTON, D.C. 20549
 
                               ----------------
 
                                SCHEDULE 14D-1
 
TENDER OFFER STATEMENT PURSUANT TO SECTION 14(D)(1) OF THE SECURITIES EXCHANGE
                                  ACT OF 1934
 
                                      AND
 
                        SCHEDULE 13D (AMENDMENT NO. 1)
 
                            ATC GROUP SERVICES INC.
                           (Name of Subject Company)
 
                               ACQUISITION CORP.
 
                          ACQUISITION HOLDINGS, INC.
                                   (Bidders)
 
                    COMMON STOCK, PAR VALUE $0.01 PER SHARE
                        (Title of Class of Securities)
 
                                  0000020671
                     (CUSIP Number of Class of Securities)
 
                             STEVEN N. HUTCHINSON
                          ACQUISITION HOLDINGS, INC.
                        C/O WEISS, PECK & GREER, L.L.C.
                              ONE NEW YORK PLAZA
                           NEW YORK, NEW YORK 10004
                                (212) 908-9500
         (Name, Address and Telephone Number of Persons Authorized to
            Receive Notices and Communications on Behalf of Bidder)
 
                               ----------------
 
                                   Copy To:
 
                           DENNIS J. FRIEDMAN, ESQ.
                              DAVID M. WILF, ESQ.
                            CHADBOURNE & PARKE LLP
                             30 ROCKEFELLER PLAZA
                              NEW YORK, NY 10112
                                (212) 408-5100
 
                           CALCULATION OF FILING FEE
 
 
<TABLE>
<CAPTION>
         TRANSACTION VALUATION*                           AMOUNT OF FILING FEE
         ----------------------                           --------------------
         <S>                                              <C>
              $117,247,008                                     $23,449.40
</TABLE>
 
 
*  Based on the offer to purchase all outstanding shares of Common Stock of
   the Subject Company at $12.00 cash per share. As of November 12, 1997, as
   reported to the Offeror by the Subject Company, the number of shares of
   Common Stock issued and outstanding was 7,930,107, the number of shares of
   Common Stock reserved for issuance upon the exercise of outstanding options
   to purchase shares of Common Stock was 750,070 and the number of shares of
   Common Stock issuable upon the exercise of certain outstanding warrants was
   1,090,407.
 
[_]Check box if any part of the fee is offset as provided by Rule 0-11(a)(2)
   and identify the filing with which the offsetting fee was previously paid.
   Identify the previous filing by registration statement number, or the Form
   or Schedule and the date of its filing.
 
      Amount Previously Paid: N/A             Filing Party:  N/A
 
      Form or Registration No.: N/A              Date filed: N/A
 
- -------------------------------------------------------------------------------
- -------------------------------------------------------------------------------
<PAGE>
 
  This statement relates to a tender offer by Acquisition Corp., a Delaware
corporation (the "Offeror"), and a wholly owned subsidiary of Acquisition
Holdings, Inc., a Delaware corporation ("Parent"), to purchase all outstanding
shares of Common Stock, par value $0.01 per share (the "Common Stock"), of ATC
Group Services Inc., a Delaware corporation (the "Company"), at a purchase
price of $12.00 per share, net to the seller in cash, without interest, upon
the terms and subject to the conditions set forth in the Offer to Purchase,
dated December 4, 1997 (the "Offer to Purchase"), and in the related Letter of
Transmittal (which together constitute the "Offer"), copies of which are filed
as Exhibits (a)(1) and (a)(2) hereof, respectively, and which are incorporated
herein by reference, and constitutes Amendment Number 1 to the Schedule 13D
filed by the Offeror on October 28, 1997 with respect to the beneficial
acquisition of securities of the same class referred to in Item 1 of this
statement. Parent has been formed in connection with the Offer and the
transactions contemplated thereby, and is currently wholly owned by WPG
Corporate Development Associates V, L.P., a Delaware limited partnership (the
"WPG Fund"). An affiliate of the WPG Fund, WPG Corporate Development
Associates V (Overseas), L.P., a Cayman Islands exempted limited partnership
(the "WPG Overseas Fund") will, on or prior to the Merger referred to below,
acquire approximately 20% of the equity capital of Parent. The Offeror is
wholly owned by the Parent.
 
ITEM 1. SECURITY AND SUBJECT COMPANY.
 
  (a) The name of the subject company is ATC Group Services Inc., a Delaware
Corporation, and the address of its principal executive offices is 104 East
25th Street, 10th Floor, New York, New York 10010.
 
  (b) The exact title of the class of equity securities being sought in the
Offer is Common Stock, par value $0.01 per share, of the Company. The
information set forth in the Introduction to the Offer to Purchase is
incorporated herein by reference.
 
  (c) The information set forth in Section 6 ("Price Range of Shares;
Dividends") of the Offer to Purchase is incorporated herein by reference.
 
ITEM 2. IDENTITY AND BACKGROUND.
 
  (a)--(d); (g) The information set forth in the Introduction and Section 9
("Certain Information Concerning the WPG Fund, the WPG Overseas Fund, Parent
and the Offeror") of the Offer to Purchase, and in Annex I thereto, is
incorporated herein by reference.
 
  (e)--(f) None of the Offeror, Parent, the WPG Fund, the WPG Overseas Fund,
WPG Private Equity Partners II, L.L.C., a Delaware limited liability company
(the sole general partner of the WPG Fund), WPG Private Equity Partners II
(Overseas), L.L.C., a Delaware limited liability company, WPG CDA V
(Overseas), Ltd., a Cayman Islands exempted company (the two general partners
of the WPG Overseas Fund), or, to the best of their knowledge, any of the
persons listed in Annex I of the Offer to Purchase, has during the last five
years (i) been convicted in a criminal proceeding (excluding traffic
violations or similar misdemeanors) or (ii) been a party to a civil proceeding
of a judicial or administrative body of competent jurisdiction and as a result
of such proceeding was or is subject to a judgment, decree or final order
enjoining future violations of, or prohibiting activities subject to, federal
or state securities laws or finding any violation of such laws.
 
ITEM 3. PAST CONTACTS, TRANSACTIONS OR NEGOTIATIONS WITH THE SUBJECT COMPANY.
 
  (a) None.
 
  (b) The information set forth in the Introduction, Section 9 ("Certain
Information Concerning the WPG Fund, the WPG Overseas Fund, Parent and the
Offeror") and Section 11 ("Background of the Offer; Past Contacts,
Transactions or Negotiations with the Company") of the Offer to Purchase is
incorporated herein by reference.
 
ITEM 4. SOURCE AND AMOUNT OF FUNDS OR OTHER CONSIDERATION.
 
  (a)--(b) The information set forth in Section 10 ("Source and Amount of
Funds") of the Offer to Purchase is incorporated herein by reference.
 
  (c) Not applicable.
 
                                       2
<PAGE>

ITEM 5. PURPOSE OF THE TENDER OFFER AND PLANS OR PROPOSALS OF THE BIDDER.
 
  (a)--(e) The information set forth in the Introduction, Section 11
("Background of the Offer; Past Contacts, Transactions or Negotiations with
the Company"), Section 12 ("Purpose of the Offer and the Merger; Plans for the
Company"), Section 13 ("The Merger Agreement") and Section 14 ("Dividends and
Distributions") of the Offer to Purchase is incorporated herein by reference.
 
  (f)--(g) The information set forth in Section 7 ("Certain Effects of the
Transaction") of the Offer to Purchase is incorporated herein by reference.
 
ITEM 6. INTEREST IN SECURITIES OF THE SUBJECT COMPANY.
 
  (a)--(b) The information set forth in the Introduction, Section 9 ("Certain
Information Concerning the WPG Fund, the WPG Overseas Fund, Parent and the
Offeror") and Section 13 ("The Merger Agreement") of the Offer to Purchase is
incorporated herein by reference.
 
ITEM 7. CONTRACTS, ARRANGEMENTS, UNDERSTANDINGS OR RELATIONSHIPS WITH RESPECT
       TO THE SUBJECT COMPANY'S SECURITIES.
 
  The information set forth in the Introduction, Section 9 ("Certain
Information Concerning the WPG Fund, Parent and the Offeror"), Section 10
("Source and Amount of Funds") and Section 11 ("Background of the Offer; Past
Contacts, Transactions or Negotiations with the Company") of the Offer to
Purchase is incorporated herein by reference.
 
ITEM 8. PERSONS RETAINED, EMPLOYED OR TO BE COMPENSATED.
 
  The information set forth in the Introduction and in Section 17 ("Fees and
Expenses") of the Offer to Purchase is incorporated herein by reference.
 
ITEM 9. FINANCIAL STATEMENTS OF CERTAIN BIDDERS.
 
  The information set forth in Section 9 ("Certain Information Concerning the
WPG Fund, the WPG Overseas Fund, Parent and the Offeror") of the Offer to
Purchase is incorporated herein by reference.
 
  The incorporation by reference herein of the above-mentioned financial
information does not constitute an admission that such information is material
to a decision by a security holder of the Company as whether to sell, tender
or hold Shares being sought in the Offer.
 
ITEM 10. ADDITIONAL INFORMATION.
 
  (a) The information set forth in the Introduction, Section 9 ("Certain
Information Concerning the WPG Fund, WPG Overseas Fund, Parent and the
Offeror") and Section 11 ("Background of the Offer; Past Contacts,
Transactions or Negotiations with the Company") of the Offer to Purchase is
incorporated herein by reference.
 
  (b)--(c) The information set forth in Section 16 ("Certain Legal Matters")
of the Offer to Purchase is incorporated herein by reference.
 
  (d) The information set forth in Section 7 ("Certain Effects of the
Transaction") of the Offer to Purchase is incorporated herein by reference.
 
  (e) The information set forth in Section 16 ("Certain Legal Matters") of the
Offer to Purchase is incorporated herein by reference.
 
  (f) The information set forth in the Offer to Purchase and the Letter of
Transmittal is incorporated herein by reference in its entirety.
 
ITEM 11. MATERIAL TO BE FILED AS EXHIBITS.
 
    (a)(1) Offer to Purchase, dated December 4, 1997.
 
    (a)(2) Letter of Transmittal with respect to the Shares.
 
                                       3
<PAGE>
 
    (a)(3) Letter, dated December 4, 1997, from BT Alex. Brown Incorporated,
          as Dealer Manager, to Brokers, Dealers, Commercial Banks, Trust
          Companies and Other Nominees.
 
    (a)(4) Letter to be sent by Brokers, Dealers, Commercial Banks, Trust
          Companies and Other Nominees to their Clients.
 
    (a)(5) Notice of Guaranteed Delivery.
 
    (a)(6) IRS Guidelines for Certification of Taxpayer Identification Number
  on Substitute Form W-9.
 
    (a)(7) Press Release issued by the Company on October 17, 1997.
 
    (a)(8) Press Release issued by the Company and Weiss, Peck & Greer,
          L.L.C., dated November 28, 1997.
 
    (b)(1) Highly Confident Letter, dated November 25, 1997, from BT Alex.
  Brown Incorporated.
 
    (b)(2) Commitment Letter, dated November 26, 1997, from Bankers Trust
  Company.
 
    (c)(1) Agreement and Plan of Merger, dated as of November 26, 1997, among
          the Parent, the Offeror and the Company.
 
    (c)(2) Stockholders Agreement, dated as of October 17, 1997, among the
          Parent and George Rubin and Morry F. Rubin.
 
    (c)(3) Form of Severance, Consulting and Non-Competition Agreement
          between the Company and George Rubin.
 
    (c)(4) Form of Severance, Consulting and Non-Competition Agreement
          between the Company and Morry F. Rubin.
 
    (d)None.
 
    (e)Not applicable.
 
    (f)None.
 
                                       4
<PAGE>
 
                                   SIGNATURE
 
  After due inquiry and to the best of my knowledge and belief, I certify that
the information set forth in this statement is true, complete and correct.
 
  Dated: December 4, 1997
 
                                          WPG CORPORATE DEVELOPMENT ASSOCIATES
                                           V, L.P.
 
 
 
                                      By:  WPG PRIVATE EQUITY PARTNERS II,
                                            L.L.C.
                                      Title: General Partner
 
 
                                                 /s/ Steven N. Hutchinson
                                          By: _________________________________
                                            NAME: STEVEN N. HUTCHINSON
                                            Title:Managing Member
 
 
                                          ACQUISITION CORP.
 
                                                 /s/ Steven N. Hutchinson
                                          By: _________________________________
                                            NAME: STEVEN N. HUTCHINSON
                                            Title:Director and President
 
 
 
                                       5
<PAGE>
 
                                 EXHIBIT INDEX
 
<TABLE>
     <C>    <S>
     (a)(1) Offer to Purchase, dated December 4, 1997.
     (a)(2) Letter of Transmittal with respect to the Shares.
     (a)(3) Letter, dated December 4, 1997, from BT Alex. Brown Incorporated,
            as Dealer Manager, to Brokers, Dealers, Commercial Banks, Trust
            Companies and Other Nominees.
     (a)(4) Letter to be sent by Brokers, Dealers, Commercial Banks, Trust
            Companies and Other Nominees to their Clients.
     (a)(5) Notice of Guaranteed Delivery.
     (a)(6) IRS Guidelines for Certification of Taxpayer Identification Number
            on Substitute Form W-9.
     (a)(7) Press Release issued by the Company on October 17, 1997.
     (a)(8) Press Release issued by the Company and Weiss, Peck & Greer,
            L.L.C., dated November 28, 1997.
     (b)(1) Highly Confident Letter, dated November 25, 1997, from BT Alex.
            Brown Incorporated.
     (b)(2) Commitment Letter, dated November 26, 1997, from Bankers Trust
            Company.
     (c)(1) Agreement and Plan of Merger, dated as of November 26, 1997, among
            the Parent, the Offeror and the Company.
     (c)(2) Stockholders Agreement, dated as of October 17, 1997, among the
            Parent and George Rubin and Morry F. Rubin.
     (c)(3) Form of Severance, Consulting and Non-Competition Agreement between
            the Company and George Rubin.
     (c)(4) Form of Severance, Consulting and Non-Competition Agreement between
            the Company and Morry F. Rubin.
     (d)    None.
     (e)    Not applicable.
     (f)    None.
</TABLE>

<PAGE>
 
                                                                 EXHIBIT (a)(1)
 
                          OFFER TO PURCHASE FOR CASH
                    ALL OUTSTANDING SHARES OF COMMON STOCK
                                      OF
                            ATC GROUP SERVICES INC.
                                      AT
                             $12.00 NET PER SHARE
                                      BY
                               ACQUISITION CORP.
                            A CORPORATION FORMED BY
                 WPG CORPORATE DEVELOPMENT ASSOCIATES V, L.P.
 
 THE OFFER AND WITHDRAWAL RIGHTS WILL EXPIRE AT 12:00 MIDNIGHT, NEW YORK
 CITY TIME, ON WEDNESDAY, JANUARY 21, 1998, UNLESS THE OFFER IS EXTENDED.
 
  THE OFFER IS CONDITIONED UPON, AMONG OTHER THINGS, (I) THERE BEING VALIDLY
TENDERED AND NOT WITHDRAWN PRIOR TO THE EXPIRATION DATE THAT NUMBER OF SHARES
OF COMMON STOCK, PAR VALUE $0.01 PER SHARE ("SHARES"), OF ATC GROUP SERVICES
INC. (THE "COMPANY") CONSTITUTING A MAJORITY OF THE OUTSTANDING SHARES
(DETERMINED ON A FULLY DILUTED BASIS FOR ALL OUTSTANDING STOCK OPTIONS AND ANY
OTHER RIGHTS TO ACQUIRE SHARES), (II) EXPIRATION OR TERMINATION OF THE
APPLICABLE WAITING PERIOD UNDER THE HART-SCOTT-RODINO ANTITRUST IMPROVEMENTS
ACT OF 1976, AS AMENDED, (III) SATISFACTION OF THE FINANCING CONDITION (AS
DEFINED BELOW) AND (IV) SATISFACTION OF CERTAIN OTHER TERMS AND CONDITIONS.
SEE SECTION 15.
 
THE OFFER IS BEING MADE IN CONNECTION WITH THE AGREEMENT AND PLAN OF MERGER,
DATED AS OF NOVEMBER 26, 1997, AMONG ACQUISITION HOLDINGS, INC., ACQUISITION
CORP. AND THE COMPANY. THE BOARD OF DIRECTORS OF THE COMPANY HAS UNANIMOUSLY
APPROVED THE OFFER, THE MERGER AND THE MERGER AGREEMENT (EACH AS DEFINED
BELOW), HAS DETERMINED THAT THE TERMS OF EACH OF THE OFFER AND THE MERGER ARE
FAIR TO, ADEQUATE, AND IN THE BEST INTERESTS OF THE COMPANY'S STOCKHOLDERS AND
RECOMMENDS THAT HOLDERS OF THE SHARES ACCEPT THE OFFER AND TENDER THEIR SHARES
IN THE OFFER.
 
                             ---------------------
 
                                   IMPORTANT
 
  Any stockholder desiring to tender Shares should either (i) complete and
sign the Letter of Transmittal or a facsimile thereof in accordance with the
instructions in the Letter of Transmittal and deliver the Letter of
Transmittal with the Shares and all other required documents to the
Depositary, or follow the procedure for book-entry transfer set forth in
Section 2, or (ii) request such stockholder's broker, dealer, commercial bank,
trust company or other nominee to effect the transaction for the stockholder.
Stockholders having Shares registered in the name of a broker, dealer,
commercial bank, trust company or other nominee must contact such person if
they desire to tender their Shares.
 
  Any stockholder who desires to tender Shares and whose certificates
representing such Shares are not immediately available, or who cannot comply
with the procedures for book-entry transfer on a timely basis, may tender such
Shares pursuant to the guaranteed delivery procedure set forth in Section 2.
 
  Questions and requests for assistance or additional copies of this Offer to
Purchase and the Letter of Transmittal may be directed to the Information
Agent or the Dealer Manager at their respective addresses and telephone
numbers set forth on the back cover of this Offer to Purchase.
 
                             ---------------------
                     The Dealer Manager for the Offer is:
 
                                BT ALEX. BROWN
 
                               DECEMBER 4, 1997
<PAGE>
 
                               TABLE OF CONTENTS
 
<TABLE>
<CAPTION>
                                                                          PAGE
                                                                          ----
<S>                                                                       <C>
INTRODUCTION.............................................................   3
 1.Terms Of The Offer....................................................   4
 2.Procedure For Tendering Shares........................................   7
 3.Withdrawal Rights.....................................................   9
 4.Acceptance For Payment And Payment For Shares.........................  10
 5.Certain Federal Income Tax Consequences...............................  11
 6.Price Range Of Shares; Dividends......................................  12
 7.Certain Effects Of The Transaction....................................  12
 8.Certain Information Concerning The Company............................  13
 9.Certain Information Concerning the WPG Fund, the WPG Overseas Fund,
     Parent and the Offeror..............................................  17
10.Source And Amount Of Funds............................................  18
11.Background Of The Offer; Past Contacts, Transactions Or Negotiations
 With The Company........................................................  21
12.Purpose Of The Offer and the Merger; Plans For The Company............  22
13.The Merger Agreement..................................................  23
14.Dividends And Distributions...........................................  30
15.Certain Conditions Of The Offer.......................................  31
16.Certain Legal Matters.................................................  32
17.Fees And Expenses.....................................................  34
18.Miscellaneous.........................................................  34
ANNEX I. CERTAIN INFORMATION CONCERNING THE MANAGING MEMBERS OF WPG
 PARTNERS II, THE GENERAL PARTNERS OF THE WPG OVERSEAS FUND AND THE
 DIRECTORS AND EXECUTIVE OFFICERS OF PARENT AND THE OFFEROR.............. A-1
</TABLE>
 
                                       2
<PAGE>
 
To The Holders Of Common Stock of ATC Group Services Inc.:
 
                                 INTRODUCTION
 
  Acquisition Corp., a Delaware corporation (the "Offeror") and a wholly owned
subsidiary of Acquisition Holdings, Inc., a Delaware corporation ("Parent"),
hereby offers to purchase all outstanding shares of Common Stock, par value
$0.01 per share (the "Common Stock"), of ATC Group Services Inc., a Delaware
corporation (the "Company"), at a purchase price of $12.00 per Share (the
"Offer Price"), net to the seller in cash, without interest, upon the terms
and subject to the conditions set forth in this Offer to Purchase and in the
related Letter of Transmittal (which together constitute the "Offer").
Tendering holders of Shares will not be obligated to pay brokerage fees or
commissions or, except as set forth in the Letter of Transmittal, transfer
taxes on the purchase of Shares by the Offeror pursuant to the Offer. The
Offeror will pay all charges and expenses of BT Alex. Brown Incorporated (the
"Dealer Manager"), Bankers Trust Company (the "Depositary") and MacKenzie
Partners, Inc. (the "Information Agent") in connection with the Offer.
 
  Parent was formed, and is currently wholly owned, by WPG Corporate
Development Associates V, L.P., a Delaware limited partnership (the "WPG
Fund"), in connection with the Offer and the transactions contemplated
thereby. WPG Corporate Development Associates V (Overseas), L.P., a Cayman
Islands exempted limited partnership (the "WPG Overseas Fund") and an
affiliate of the WPG Fund, will, on or prior to the Merger referred to below,
acquire approximately 13% of the equity capital of Parent. The Offeror is
wholly owned by Parent. For information concerning the WPG Fund and the WPG
Overseas Fund, see Section 9.
 
  THE BOARD OF DIRECTORS OF THE COMPANY HAS UNANIMOUSLY APPROVED THE OFFER,
THE MERGER AND THE MERGER AGREEMENT, HAS DETERMINED THAT THE TERMS OF EACH OF
THE OFFER AND THE MERGER ARE FAIR TO, ADEQUATE, AND IN THE BEST INTERESTS OF
THE COMPANY'S STOCKHOLDERS AND RECOMMENDS THAT HOLDERS OF THE SHARES ACCEPT
THE OFFER AND TENDER THEIR SHARES IN THE OFFER.
 
  THE OFFER IS CONDITIONED UPON, AMONG OTHER THINGS, (i) THERE BEING VALIDLY
TENDERED AND NOT WITHDRAWN PRIOR TO THE EXPIRATION DATE THAT NUMBER OF SHARES
OF THE COMPANY CONSTITUTING A MAJORITY OF THE OUTSTANDING SHARES (DETERMINED
ON A FULLY DILUTED BASIS FOR ALL OUTSTANDING STOCK OPTIONS AND ANY OTHER
RIGHTS TO ACQUIRE SHARES) (THE "MINIMUM CONDITION"), (ii) EXPIRATION OR
TERMINATION OF THE APPLICABLE WAITING PERIOD UNDER THE HART-SCOTT-RODINO
ANTITRUST IMPROVEMENTS ACT OF 1976, AS AMENDED (THE "HSR ACT"), (iii) THE
OFFEROR HAVING OBTAINED FINANCING IN AMOUNTS SUFFICIENT TO CONSUMMATE THE
OFFER AND THE MERGER INCLUDING, WITHOUT LIMITATION (a) TO PAY, WITH RESPECT TO
ALL COMMON STOCK IN THE MERGER, THE MERGER CONSIDERATION (AS DEFINED HEREIN),
(b) TO REFINANCE CERTAIN OUTSTANDING INDEBTEDNESS OF THE COMPANY, (c) TO PAY
ANY FEES AND EXPENSES IN CONNECTION WITH THE OFFER AND THE MERGER OR THE
FINANCING THEREOF AND (d) TO PROVIDE FOR THE WORKING CAPITAL NEEDS OF THE
COMPANY FOLLOWING THE MERGER, INCLUDING, WITHOUT LIMITATION, IF APPLICABLE,
LETTERS OF CREDIT (THE "FINANCING CONDITION") AND (iv) SATISFACTION OF CERTAIN
OTHER TERMS AND CONDITIONS. SEE SECTION 15.
 
  LEHMAN BROTHERS INC., THE COMPANY'S FINANCIAL ADVISOR, HAS DELIVERED TO THE
SPECIAL COMMITTEE OF THE COMPANY'S BOARD OF DIRECTORS ITS WRITTEN OPINION
THAT, AS OF THE DATE OF SUCH OPINION, THE CONSIDERATION TO BE OFFERED TO THE
STOCKHOLDERS OF THE COMPANY PURSUANT TO THE OFFER AND THE MERGER IS FAIR TO
SUCH STOCKHOLDERS FROM A FINANCIAL POINT OF VIEW. A COPY OF SUCH OPINION IS
CONTAINED IN THE COMPANY'S STATEMENT ON SCHEDULE 14D-9, WHICH IS BEING
DISTRIBUTED TO THE COMPANY'S STOCKHOLDERS.
 
  The Offer is being made pursuant to the Agreement and Plan of Merger dated
as of November 26, 1997 (the "Merger Agreement"), among Parent, the Offeror
and the Company pursuant to which, following the consummation of the Offer and
the satisfaction or waiver of certain conditions, the Offeror will be merged
with
 
                                       3
<PAGE>
 
and into the Company (the "Merger"), with the Company surviving the Merger (as
such, the "Surviving Corporation") as a wholly owned subsidiary of Parent. In
the Merger, each outstanding Share (other than Shares owned by the Company,
any subsidiary of the Company, Parent, the Offeror or any other subsidiary of
Parent or by stockholders, if any, who are entitled to and who properly
exercise dissenters' rights under Delaware law) will be converted into the
right to receive from the Surviving Corporation the Offer Price in cash,
without interest (the "Merger Consideration"). See Section 12.
 
  The Merger is subject to a number of conditions, including approval by
stockholders of the Company, if such approval is required by applicable law.
If the Offeror acquires 90% or more of the outstanding Shares pursuant to the
Offer or otherwise, the Offeror would be able to effect the Merger pursuant to
the short-form merger provisions of the Delaware General Corporation Law (the
"DGCL"), without prior notice to, or any action by, any other stockholder of
the Company. See Section 12.
 
  The Merger Agreement is more fully described in Section 13. The Company has
informed the Offeror that, as of November 12, 1997, there were 7,930,107
Shares issued and outstanding, 750,070 Shares reserved for issuance upon the
exercise of outstanding options to purchase Shares ("Options") and 1,090,407
Shares issuable upon the exercise of certain outstanding Warrants (as defined
herein). Based upon the foregoing, the Offeror believes that approximately
4,885,293 Shares constitute a majority of the outstanding Shares on a fully
diluted basis. Accordingly, the Minimum Condition will be satisfied if at
least 4,885,293 Shares, (approximately 50.00% plus one share of the Shares on
a fully diluted basis), are validly tendered and not withdrawn prior to the
Expiration Date (as defined herein). However, the actual number of Shares that
would satisfy the Minimum Condition will depend on the facts as they exist on
the date of purchase. If the Minimum Condition is satisfied and the Offeror
accepts for payment Shares tendered pursuant to the Offer, the Offeror will be
able to elect a majority of the members of the Company's Board of Directors
and to effect the Merger without the affirmative vote of any other stockholder
of the Company.
 
  Certain Federal income tax consequences of the sale of Shares pursuant to
the Offer and the conversion of Shares pursuant to the Merger are described in
Section 5.
 
  THIS OFFER TO PURCHASE AND THE RELATED LETTER OF TRANSMITTAL CONTAIN
IMPORTANT INFORMATION WHICH SHOULD BE READ BEFORE ANY DECISION IS MADE WITH
RESPECT TO THE OFFER.
 
1. TERMS OF THE OFFER.
 
  Upon the terms and subject to the conditions of the Offer (including if the
Offer is extended or amended, the terms and conditions of any extension or
amendment), the Offeror will accept for payment and pay for all Shares validly
tendered prior to the Expiration Date and not theretofore withdrawn in
accordance with Section 3. The term "Expiration Date" means 12:00 midnight,
New York City time, on January 21, 1998, unless and until the Offeror shall
have extended the period of time during which the Offer is open, in which
event the term "Expiration Date" shall mean the latest time and date at which
the Offer, as so extended by the Offeror, will expire.
 
  THE OFFER IS CONDITIONED UPON SATISFACTION OF THE MINIMUM CONDITION AND THE
FINANCING CONDITION, THE EXPIRATION OR TERMINATION OF ALL WAITING PERIODS
IMPOSED BY THE HSR ACT AND THE SATISFACTION OF THE OTHER CONDITIONS SET FORTH
IN SECTION 15.
 
  In the Merger Agreement the Offeror has agreed that it will not, without the
consent of the Company, extend the Offer, except that, without the consent of
the Company, the Offeror may extend the Offer (a) if at the scheduled or
extended Expiration Date any of the conditions to the Offeror's obligation to
accept Shares for payment are not satisfied or waived, until such time as such
conditions are satisfied or waived, (b) for any period required by any rule,
regulation, interpretation or position of the Securities and Exchange
Commission (the "Commission") or the staff thereof applicable to the Offer,
(c) from time to time until two business days after
 
                                       4
<PAGE>
 
the expiration of the waiting period under the HSR Act and (d) for a period of
not more than 15 business days, notwithstanding that all conditions to the
Offer are satisfied as of such Expiration Date if, immediately prior to such
Expiration Date (as it may be extended), the Shares tendered and not withdrawn
pursuant to the Offer equal less than 90% of the outstanding Shares (on a
fully diluted basis). In addition, the Offeror shall be obligated to extend
the Offer, if at the scheduled Expiration Date any of the conditions to the
Offeror's obligation to accept shares for payment capable of satisfaction
shall not have been satisfied or waived, until the satisfaction or waiver
thereof; provided, however, that there shall be no such obligation to extend
the Offer beyond the 60th business day after the commencement of the Offer. As
used in this Offer to Purchase, "business day" has the meaning set forth in
Rule 14d-1 under the Securities and Exchange Act of 1934, as amended (the
"Exchange Act").
 
  In addition, the Offeror has agreed in the Merger Agreement that it will
not, without the consent of the Company, (a) reduce the number of Shares
subject to the Offer, (b) reduce the Offer Price, (c) add to or modify (other
than waive) the conditions set forth in Section 15, (d) change the form of the
consideration payable in the Offer, (e) extend the Offer, except as provided
in the Merger Agreement, (f) amend any other term of or add any new term to
the Offer in any manner materially adverse to the Company's stockholders or
(g) waive the Minimum Condition.
 
  Subject to the terms of the Merger Agreement and the applicable rules and
regulations of the Commission, the Offeror reserves the right, in its sole
discretion, at any time and from time to time, and regardless of whether or
not any of the events or facts set forth in Section 15 hereof shall have
occurred to, (a) extend the period of time during which the Offer is open, and
thereby delay acceptance for payment of and the payment for any Shares, by
giving oral or written notice of such extension to the Depositary and (b)
amend the Offer in any other respect by giving oral or written notice of such
amendment to the Depositary. UNDER NO CIRCUMSTANCES WILL INTEREST BE PAID ON
THE PURCHASE PRICE FOR TENDERED SHARES, WHETHER OR NOT THE OFFEROR EXERCISES
ITS RIGHT TO EXTEND THE OFFER.
 
  If by 12:00 midnight, New York City time, on January 21, 1998 (or any date
or time then set as the Expiration Date), any or all of the conditions to the
Offer have not been satisfied or waived, the Offeror reserves the right (but
shall not be obligated), subject to the terms and conditions contained in the
Merger Agreement and to the applicable rules and regulations of the Commission
to, (a) terminate the Offer and not accept for payment or pay for any Shares
and return all tendered Shares to tendering stockholders, (b) waive any or all
of the unsatisfied conditions and accept for payment and pay for all Shares
validly tendered prior to the Expiration Date and not theretofore withdrawn,
(c) extend the Offer and, subject to the right of stockholders to withdraw
Shares until the Expiration Date, retain the Shares that have been tendered
during the period or periods for which the Offer is extended or (d) amend the
Offer.
 
  There can be no assurance that the Offeror will exercise its right to extend
the Offer beyond any required extensions. Any extension, waiver, amendment or
termination will be followed as promptly as practicable by a public
announcement. In the case of an extension, Rule 14e-l(d) under the Exchange
Act, requires that the announcement be issued no later than 9:00 a.m., New
York City time, on the next business day after the previously scheduled
Expiration Date in accordance with the public announcement requirements of
Rule 14d-4(c) under the Exchange Act. Subject to applicable law (including
Rules 14d-4(c) and 14d-6(d) under the Exchange Act, which require that any
material change in the information published, sent or given to stockholders in
connection with the Offer be promptly disseminated to stockholders in a manner
reasonably designed to inform stockholders of such change) and without
limiting the manner in which the Offeror may choose to make any public
announcement, the Offeror will not have any obligation to publish, advertise
or otherwise communicate any such public announcement other than by making a
release to the Dow Jones News Service.
 
  If the Offeror extends the Offer or if the Offeror is delayed in its
acceptance for payment of or payment (whether before or after its acceptance
for payment of Shares) for Shares or it is unable to pay for Shares pursuant
to the Offer for any reason, then, without prejudice to the Offeror's rights
under the Offer, the Depositary may retain tendered Shares on behalf of the
Offeror, and such Shares may not be withdrawn except to the extent tendering
stockholders are entitled to withdrawal rights as described in Section 3.
However, the ability of the Offeror to delay the payment for Shares that the
Offeror has accepted for payment is limited by Rule 14e-1(c)
 
                                       5
<PAGE>
 
under the Exchange Act, which requires that a bidder pay the consideration
offered or return the securities deposited by or on behalf of holders of
securities promptly after the termination or withdrawal of such bidder's
offer.
 
  If the Offeror makes a material change in the terms of the Offer or the
information concerning the Offer or waives a material condition of the Offer
(including, with the Company's consent, a waiver of the Minimum Condition),
the Offeror will disseminate additional tender offer materials and extend the
Offer to the extent required by Rules 14d-4(c), 14d-6(d) and 14e-1 under the
Exchange Act. The minimum period during which an offer must remain open
following material changes in the terms of the offer or information concerning
the offer, other than a change in price or a change in the percentage of
securities sought, will depend upon the facts and circumstances then existing,
including the relative materiality of the changed terms or information. With
respect to a change in price or a change in the percentage of securities
sought, a minimum period of 10 business days is generally required to allow
for adequate dissemination to stockholders.
 
  Consummation of the Offer is conditioned upon the satisfaction of the
Minimum Condition and the Financing Condition, the expiration or termination
of all waiting periods imposed by the HSR Act and the other conditions set
forth in Section 15. Subject to the terms and conditions contained in the
Merger Agreement, the Offeror reserves the right (but shall not be obligated)
to waive any or all such conditions. However, if the Offeror waives or amends
the Minimum Condition (which action may not be taken without the Company's
consent) during the last five business days during which the Offer is open,
the Offeror will be required to extend the Expiration Date so that the Offer
will remain open for at least five business days after the announcement of
such waiver or amendment is first published, sent or given to holders of
Shares and may also be required to extend the Offer if other conditions are
waived, depending on the materiality of the waiver.
 
  The Company has provided the Offeror with the Company's stockholder lists
and security position listings for the purpose of disseminating the Offer to
holders of Shares. This Offer to Purchase, the related Letter of Transmittal
and other relevant materials will be mailed by the Offeror to record holders
of Shares, and will be furnished to brokers, dealers, banks, trust companies
and similar persons whose names, or the names of whose nominees, appear on the
stockholder lists, or, if applicable, who are listed as participants in a
clearing agency's security position listing, for subsequent transmittal to
beneficial owners of Shares.
 
  The Offeror is not offering to purchase any of the options or warrants to
acquire Shares. The Merger Agreement provides that the Company will amend its
Stock Option Plans (as defined herein) to provide that all outstanding,
unexercised Options (as defined herein) shall be immediately excercisable and
that if the optionees do not exercise their unexercised Options prior to the
effectiveness of the Merger, each optionee shall receive, in settlement of
each Option held by the optionee, a "cash amount" (less any applicable
withholding taxes) with respect to the number of previously unexercised Shares
underlying the option immediately prior to the effectiveness of the Merger.
The Company shall use its commercially reasonable efforts to amend the Stock
Option Plans to provide that each Option shall terminate no later than the
effectiveness of the Merger. The cash amount payable for each Option shall
equal the product of (i) the Merger Consideration minus the exercise price per
Share of each such Option and (ii) the number of previously unexercised Shares
covered by each Option. Pursuant to the Merger Agreement, the Company is
required to provide notice of the above amendments to the Stock Option Plans
to participants in its Stock Option Plans. Except as may otherwise be agreed
to by Parent or the Offeror and the Company, the Company shall use its
commercially reasonable efforts so that its Stock Option Plans shall terminate
as of the effectiveness of the Merger and the provisions of any other plan,
program or arrangement providing for the issuance or grant of any other
interest in respect of the capital stock of the Company or any of its
subsidiaries shall be deleted as of the effective time of the Merger (the
"Effective Time"). The Company shall use its commercially reasonable efforts
so that following the Effective Time of the Merger no holder of Options will
have any right to receive Shares upon exercise of an Option. See Section 13,
"The Merger Agreement--Options; Warrants."
 
  The holders of the Warrants (as defined herein) shall be entitled either to
exercise their Warrants for Shares in accordance with the applicable agreement
under which such Warrants were issued and tender such Shares in
 
                                       6
<PAGE>
 
the Offer or upon execution and delivery to the Company of a cancellation
agreement in form and substance reasonably satisfactory to the Company, to
receive from the Company at the Effective Time a "cash amount" equal to the
product of (i) the Merger Consideration minus the exercise price per share of
each such Warrant and (ii) the number of unexercised Shares covered by each
such Warrant.
 
2. PROCEDURE FOR TENDERING SHARES.
 
  Valid Tenders. For Shares to be validly tendered pursuant to the Offer, a
properly completed and duly executed Letter of Transmittal (or a manually
signed facsimile thereof), with any required signature guarantees, or, in the
case of a book-entry transfer, an Agent's Message (as defined herein), and any
other required documents, must be received by the Depositary at one of its
addresses set forth on the back cover of this Offer to Purchase prior to the
Expiration Date, or the tendering stockholder must comply with the guaranteed
delivery procedure set forth below. In addition, either (i) certificates
representing such Shares must be received by the Depositary along with the
Letter of Transmittal or such Shares must be tendered pursuant to the
procedure for book-entry transfer set forth below, and a Book-Entry
Confirmation must be received by the Depositary, in each case prior to the
Expiration Date, or (ii) the guaranteed delivery procedures set forth below
must be complied with. No alternative, conditional or contingent tenders will
be accepted.
 
  DELIVERY OF DOCUMENTS TO A BOOK-ENTRY TRANSFER FACILITY IN ACCORDANCE WITH
SUCH BOOK-ENTRY TRANSFER FACILITY'S PROCEDURES DOES NOT CONSTITUTE DELIVERY TO
THE DEPOSITARY.
 
  Book-Entry Transfer. The Depositary will make a request to establish an
account with respect to the Shares at each Book-Entry Transfer Facility for
purposes of the Offer within two business days after the date of this Offer to
Purchase. Any financial institution that is a participant in a Book-Entry
Transfer Facility's system may make book-entry delivery of Shares by causing a
Book-Entry Transfer Facility to transfer such Shares into the Depositary's
account at a Book-Entry Transfer Facility in accordance with such Book-Entry
Transfer Facility's procedures for transfer. Although delivery of Shares may
be effected through book-entry at a Book-Entry Transfer Facility prior to the
Expiration Date, (i) the Letter of Transmittal (or a manually signed facsimile
thereof), properly completed and duly executed, with any required signature
guarantees, or an Agent's Message in connection with a book-entry transfer,
and any other required documents, must, in any case, be transmitted to and
received by the Depositary at one of its addresses set forth on the back cover
of this Offer to Purchase or (ii) the guaranteed delivery procedures described
below must be complied with.
 
  Signature Guarantee. Signatures on the Letter of Transmittal must be
guaranteed by a member in good standing of the Securities Transfer Agents
Medallion Program, or by any other bank, broker, dealer, credit union, savings
association or other entity which is an "eligible guarantor institution," as
such term is defined in Rule 17Ad-15 under the Exchange Act (each of the
foregoing being referred to as an "Eligible Institution" and, collectively, as
"Eligible Institutions"), unless the Shares tendered thereby are tendered (i)
by a registered holder of Shares who has not completed either the box labeled
"Special Delivery Instructions" or the box labeled "Special Payment
Instructions" on the Letter of Transmittal or (ii) for the account of any
Eligible Institution. If the certificates evidencing Shares are registered in
the name of a person or persons other than the signer of the Letter of
Transmittal, or if payment is to be made, or delivered to, or certificates
evidencing unpurchased Shares are to be issued or returned to, a person other
than the registered owner or owners, then the tendered certificates must be
endorsed or accompanied by duly executed stock powers, in either case signed
exactly as the name or names of the registered owner or owners appear on the
certificates, with the signatures on the certificates or stock powers
guaranteed by an Eligible Institution as provided in the Letter of
Transmittal. See Instructions 1 and 5 to the Letter of Transmittal.
 
  Guaranteed Delivery. If a stockholder desires to tender Shares pursuant to
the Offer and such stockholder's certificates for Shares are not immediately
available or time will not permit all required documents to reach the
Depositary prior to the Expiration Date or the procedure for book-entry
transfer cannot be completed
 
                                       7
<PAGE>
 
on a timely basis, such Shares may nevertheless be tendered if all of the
following guaranteed delivery procedures are duly complied with:
 
    (i) the tender is made by or through an Eligible Institution;
 
    (ii) a properly completed and duly executed Notice of Guaranteed
  Delivery, substantially in the form made available by the Offeror, is
  received by the Depositary, as provided below, prior to the Expiration
  Date; and
 
    (iii) the certificates for all tendered Shares, in proper form for
  transfer (or a Book-Entry Confirmation with respect to such Shares),
  together with a properly completed and duly executed Letter of Transmittal
  (or a manually signed facsimile thereof), with any required signature
  guarantees, or, in the case of a book-entry transfer, an Agent's Message,
  and any other documents required by the Letter of Transmittal are received
  by the Depositary within three trading days after the date of such Notice
  of Guaranteed Delivery. The term "trading day" is any day on which The
  Nasdaq Stock Market, Inc.'s National Market ("NASDAQ") is open for
  business.
 
  The Notice of Guaranteed Delivery may be delivered by hand or transmitted by
facsimile transmission or by mail to the Depositary and must include a
guarantee by an Eligible Institution in the form set forth in such Notice of
Guaranteed Delivery.
 
  THE METHOD OF DELIVERY OF SHARES, THE LETTER OF TRANSMITTAL AND ALL OTHER
REQUIRED DOCUMENTS, INCLUDING DELIVERY THROUGH ANY BOOK-ENTRY TRANSFER
FACILITY, IS AT THE ELECTION AND SOLE RISK OF THE TENDERING STOCKHOLDER. IF
DELIVERY IS BY MAIL, REGISTERED MAIL WITH RETURN RECEIPT REQUESTED, PROPERLY
INSURED, IS RECOMMENDED. DELIVERY OF THIS LETTER OF TRANSMITTAL AND
ACCOMPANYING SHARES WILL BE DEEMED EFFECTIVE AND RISK OF LOSS WITH RESPECT TO
SUCH LETTER OF TRANSMITTAL AND ACCOMPANYING CERTIFICATE(S) WILL PASS ONLY WHEN
SUCH LETTER OF TRANSMITTAL AND ACCOMPANYING CERTIFICATE(S) ARE ACTUALLY
RECEIVED BY THE DEPOSITARY.
 
  Notwithstanding any other provision hereof, payment for Shares accepted for
payment pursuant to the Offer will in all cases be made only after timely
receipt by the Depositary of (i) certificates for such Shares or a Book-Entry
Confirmation, (ii) a properly completed and duly executed Letter of
Transmittal (or a manually signed facsimile thereof), with all required
signature guarantees, or, in the case of a book-entry transfer, an Agent's
Message, and (iii) any other documents required by the Letter of Transmittal.
 
  BACKUP FEDERAL INCOME TAX WITHHOLDING. TO PREVENT "BACKUP" FEDERAL INCOME
TAX WITHHOLDING WITH RESPECT TO PAYMENT OF THE PURCHASE PRICE OF SHARES
PURCHASED PURSUANT TO THE OFFER, EACH STOCKHOLDER MUST PROVIDE THE DEPOSITARY
WITH SUCH STOCKHOLDER'S CORRECT TAXPAYER IDENTIFICATION NUMBER ("TIN") AND
CERTIFY THAT SUCH STOCKHOLDER IS NOT SUBJECT TO BACKUP FEDERAL INCOME TAX
WITHHOLDING BY COMPLETING THE SUBSTITUTE FORM W-9 INCLUDED IN THE LETTER OF
TRANSMITTAL. FOREIGN HOLDERS MUST SUBMIT A COMPLETED FORM W-8 TO AVOID BACKUP
WITHHOLDING. THIS FORM MAY BE OBTAINED FROM THE DEPOSITARY. SEE INSTRUCTIONS 8
AND 9 SET FORTH IN THE LETTER OF TRANSMITTAL.
 
  Determination of Validity. All questions as to the form of documents and the
validity, eligibility (including time of receipt) and acceptance for payment
of any tender of Shares will be determined by the Offeror, in its sole
discretion, and its determination will be final and binding on all parties.
The Offeror reserves the absolute right to reject any or all tenders of any
Shares that are determined by it not to be in proper form or the acceptance of
or payment for which may, in the opinion of the Offeror, be unlawful. The
Offeror also reserves the absolute right to waive any of the conditions of the
Offer, subject to the limitations set forth in the Merger Agreement, or any
defect or irregularity in the tender of any Shares. Subject to the terms of
the Merger Agreement and
 
                                       8
<PAGE>
 
applicable law, the Offeror's interpretation of the terms and conditions of
the Offer (including the Letter of Transmittal and the Instructions to the
Letter of Transmittal) will be final and binding on all parties. No tender of
Shares will be deemed to have been validly made until all defects and
irregularities have been cured or waived. None of the Offeror, Parent, the WPG
Fund, the WPG Overseas Fund, the Dealer Manager, the Depositary, the
Information Agent or any other person will be under any duty to give
notification of any defects or irregularities in tenders or incur any
liability for failure to give any such notification.
 
  Other Requirements. By executing the Letter of Transmittal as set forth
above (including through delivery of an Agent's Message), a tendering
stockholder irrevocably appoints designees of the Offeror as such
stockholder's attorneys-in-fact and proxies, each with full power of
substitution, in the manner set forth in the Letter of Transmittal, to the
full extent of such stockholder's right with respect to the Shares tendered by
such stockholder and accepted for payment by the Offeror (and any and all
other Shares or other securities issued or issuable in respect of such Shares
on or after November 26, 1997). All such powers of attorney and proxies shall
be considered coupled with an interest in the tendered Shares. This
appointment is effective when, and only to the extent that, the Offeror
accepts for payment the Shares deposited with the Depositary. Upon acceptance
for payment, all prior powers of attorney and proxies given by the stockholder
with respect to such Shares or other securities or rights will, without
further action, be revoked and no subsequent proxies may be given or written
consent executed (and, if given or executed, will not be deemed effective).
The designees of the Offeror will, with respect to the Shares and other
securities or rights, be empowered to exercise all voting and other rights of
such stockholder as they in their sole judgment deem proper in respect of any
annual or special meeting of the Company's stockholders, or any adjournment or
postponement thereof. The Offeror reserves the right to require that, in order
for Shares to be deemed validly tendered, immediately upon the Offeror's
payment for such Shares, the Offeror must be able to exercise full voting and
other rights with respect to such Shares and the other securities or rights
issued or issuable in respect of such Shares, including voting at any meeting
of stockholders (whether annual or special or whether or not adjourned) in
respect of such Shares.
 
  A tender of Shares pursuant to any one of the procedures described above
will constitute the tendering stockholder's acceptance of the terms and
conditions of the Offer, as well as the tendering stockholder's representation
and warranty that (i) such stockholder has the full power and authority to
tender, sell, assign and transfer the tendered Shares (and any and all other
Shares or other securities issued or issuable in respect of such Shares on or
after November 26, 1997), and (ii) when the same are accepted for payment by
the Offeror, the Offeror will acquire good and unencumbered title thereto,
free and clear of all liens, restrictions, charges and encumbrances and not
subject to any adverse claims. The Offeror's acceptance for payment of Shares
tendered pursuant to the Offer will constitute a binding agreement between the
tendering stockholder and the Offeror upon the terms and subject to the
conditions of the Offer.
 
3. WITHDRAWAL RIGHTS.
 
  Except as otherwise provided in this Section 3, tenders of Shares made
pursuant to the Offer are irrevocable. Shares tendered pursuant to the Offer
may be withdrawn at any time prior to the Expiration Date and, unless
theretofore accepted for payment pursuant to the Offer, may also be withdrawn
at any time after February 2, 1998. If purchase of or payment for Shares is
delayed for any reason or if the Offeror is unable to purchase or pay for
Shares for any reason, then, without prejudice to the Offeror's rights under
the Offer, tendered Shares may be retained by the Depositary on behalf of the
Offeror and may not be withdrawn except to the extent that tendering
stockholders are entitled to withdrawal rights as set forth in this Section 3,
subject to Rule 14e-1(c) under the Exchange Act, which provides that no person
who makes a tender offer shall fail to pay the consideration offered or return
the securities deposited by or on behalf of security holders promptly after
the termination or withdrawal of the Offer.
 
  For a withdrawal of Shares tendered pursuant to the Offer to be effective, a
written, telegraphic, telex or facsimile transmission notice of withdrawal
must be timely received by the Depositary at one of its addresses set forth on
the back cover of this Offer to Purchase. Any notice of withdrawal must
specify the name of the person who tendered the Shares to be withdrawn, the
number of Shares to be withdrawn and the name in which the
 
                                       9
<PAGE>
 
certificates representing such Shares are registered, if different from that
of the person who tendered the Shares. If certificates for Shares to be
withdrawn have been delivered or otherwise identified to the Depositary, then,
prior to the physical release of such certificates, the serial numbers shown
on such certificates must be submitted to the Depositary and, unless such
Shares have been tendered by an Eligible Institution, the signatures on the
notice of withdrawal must be guaranteed by an Eligible Institution. If Shares
have been tendered pursuant to the procedures for book-entry transfer set
forth in Section 2, any notice of withdrawal must also specify the name and
number of the account at the Book-Entry Transfer Facility to be credited with
the withdrawn Shares and must otherwise comply with such Book-Entry Transfer
Facility's procedures. All questions as to the form and validity (including
time of receipt) of notices of withdrawal will be determined by the Offeror,
in its sole discretion, and its determination will be final and binding on all
parties. None of the Offeror, Parent, the WPG Fund, the WPG Overseas Fund, the
Dealer Manager, the Depositary, the Information Agent or any other person will
be under any duty to give notification of any defects or irregularities in any
notice of withdrawal or incur any liability for failure to give any such
notification.
 
  Any Shares properly withdrawn will be deemed not validly tendered for
purposes of the Offer, but may be retendered at any subsequent time prior to
the Expiration Date by following any of the procedures described in Section 2.
 
4. ACCEPTANCE FOR PAYMENT AND PAYMENT FOR SHARES.
 
  Upon the terms and subject to the conditions of the Offer (including, if the
Offer is extended or amended, the terms and conditions of any such extension
or amendment), the Offeror will accept for payment and will pay for all Shares
validly tendered prior to the Expiration Date and not theretofore withdrawn in
accordance with Section 3 promptly after the later to occur of (a) the
Expiration Date and (b) subject to compliance with Rule 14e-1(c) under the
Exchange Act, the satisfaction or waiver of the conditions set forth in
Section 15. Subject to compliance with Rule 14e-1(c) under the Exchange Act,
the Offeror expressly reserves the right to delay payment for Shares in order
to comply in whole or in part with any applicable law. See Sections 1 and 16.
In all cases, payment for Shares tendered and accepted for payment pursuant to
the Offer will be made only after timely receipt by the Depositary of (i)
certificates for such Shares or timely confirmation (a "Book-Entry
Confirmation") of a book-entry transfer of such Shares into the Depositary's
account at The Depository Trust Company or the Philadelphia Depository Trust
Company (collectively, the "Book-Entry Transfer Facilities"), pursuant to the
procedures set forth in Section 2, (ii) a properly completed and duly executed
Letter of Transmittal (or a manually signed facsimile thereof) with all
required signature guarantees or, in the case of a book-entry transfer, an
Agent's Message (as defined below) and (iii) any other documents required by
the Letter of Transmittal.
 
  The term "Agent's Message" means a message transmitted by a Book-Entry
Transfer Facility to, and received by, the Depositary and forming a part of a
Book-Entry Confirmation, which states that such Book-Entry Transfer Facility
has received an express acknowledgment from the participant in such Book-Entry
Transfer Facility tendering the Shares that such participant has received and
agrees to be bound by the terms of the Letter of Transmittal and that the
Offeror may enforce such agreement against the participant.
 
  For purposes of the Offer, the Offeror will be deemed to have accepted for
payment, and thereby purchased, Shares validly tendered and not withdrawn as,
if and when the Offeror gives oral or written notice to the Depositary of the
Offeror's acceptance of such Shares for payment. In all cases, payment for
Shares purchased pursuant to the Offer will be made by deposit of the purchase
price with the Depositary, which will act as agent for tendering stockholders
for the purpose of receiving payment from the Offeror and transmitting such
payment to tendering stockholders. If, for any reason whatsoever, acceptance
for payment of any Shares tendered pursuant to the Offer is delayed, or the
Offeror is unable to accept for payment Shares tendered pursuant to the Offer,
then, without prejudice to the Offeror's rights under Section 1, the
Depositary may, nevertheless, on behalf of the Offeror, retain tendered
Shares, and such Shares may not be withdrawn, except to the extent that the
tendering stockholders are entitled to withdrawal rights as described in
Section 3 above and as otherwise required by
 
                                      10
<PAGE>
 
Rule 14e-1(c) under the Exchange Act. Under no circumstances will interest be
paid by the Offeror because of any delay in making such payment.
 
  If any tendered Shares are not accepted for payment pursuant to the terms
and conditions of the Offer for any reason, or if certificates are submitted
for more Shares than are tendered, certificates for such unpurchased or
untendered Shares will be returned, without expense to the tendering
stockholder (or, in the case of Shares delivered by book-entry transfer to a
Book-Entry Transfer Facility, such Shares will be credited to an account
maintained within such Book-Entry Transfer Facility), as promptly as
practicable after the expiration, termination or withdrawal of the Offer.
 
  If, prior to the Expiration Date, the Offeror increases the price being paid
for Shares accepted for payment pursuant to the Offer, such increased
consideration will be paid to all stockholders whose Shares are purchased
pursuant to the Offer, whether or not such Shares were tendered prior to such
increase in consideration.
 
  The Offeror reserves the right to transfer or assign, in whole or from time
to time in part, to one or more of its affiliates the right to purchase Shares
tendered pursuant to the Offer, but any such transfer or assignment will not
relieve the Offeror of its obligations under the Offer or prejudice the rights
of tendering stockholders to receive payment for Shares validly tendered and
accepted for payment.
 
5. CERTAIN FEDERAL INCOME TAX CONSEQUENCES.
 
  The following is a summary of certain United States federal income tax
consequences of the Offer and the Merger to holders whose Shares are purchased
pursuant to the Offer or whose Shares are converted to cash in the Merger
(including pursuant to the exercise of appraisal rights). The discussion is
for general information only and does not purport to consider all aspects of
federal income taxation that may be relevant to holders of Shares. The
discussion is based on current provisions of the Internal Revenue Code of
1986, as amended (the "Code"), existing, proposed and temporary regulations
promulgated thereunder and administrative and judicial interpretations
thereof, all of which are subject to change. The discussion applies only to
holders of Shares in whose hands Shares are capital assets within the meaning
of Section 1221 of the Code, and may not apply to Shares received pursuant to
the exercise of employee stock options or otherwise as compensation, or to
certain types of holders of Shares (such as insurance companies, tax-exempt
organizations and broker-dealers) who may be subject to special rules. This
discussion does not discuss the federal income tax consequences to a holder of
Shares who, for United States federal income tax purposes, is a non-resident
alien individual, a foreign corporation, a foreign partnership or a foreign
estate or trust, nor does it consider the effect of any foreign, state or
local tax laws.
 
  BECAUSE INDIVIDUAL CIRCUMSTANCES MAY DIFFER, EACH HOLDER OF SHARES SHOULD
CONSULT SUCH HOLDER'S OWN TAX ADVISOR TO DETERMINE THE APPLICABILITY OF THE
RULES DISCUSSED BELOW TO SUCH HOLDER AND THE PARTICULAR TAX EFFECTS TO SUCH
HOLDER OF THE OFFER AND THE MERGER, INCLUDING THE APPLICATION AND EFFECT OF
STATE, LOCAL AND OTHER INCOME TAX LAWS.
 
  The receipt of cash for Shares pursuant to the Offer or the Merger will be a
taxable transaction for federal income tax purposes. In general, for federal
income tax purposes, a holder of Shares will recognize gain or loss equal to
the difference between the holder's adjusted tax basis in the Shares sold
pursuant to the Offer or converted to cash in the Merger and the amount of
cash received therefor. Gain or loss must be determined separately for each
block of Shares (i.e., Shares acquired at the same cost in a single
transaction) sold pursuant to the Offer or converted to cash in the Merger.
Such gain or loss will be capital gain or loss, in the case of an individual,
will be taxable at a maximum rate of 28% if the holder held the Shares for
more than one year but not more than eighteen months or at a maximum rate of
20% if the holder held the Shares for more than eighteen months, on the date
of sale (in the case of the Offer) or the Effective Time (in the case of the
Merger). The receipt of cash for Shares pursuant to the exercise of appraisal
rights will generally be taxed in the same manner as described above. Payments
in connection with the Offer or the Merger may be subject to "backup
 
                                      11
<PAGE>
 
withholding" at a rate of 31%, unless a holder of Shares (a) is a corporation
or comes within certain exempt categories and, when required, demonstrates
this fact or (b) provides a correct TIN to the payor, certifies as to no loss
of exemption from backup withholding and otherwise complies with applicable
requirements of the backup withholding rules. A holder who does not provide a
correct TIN may be subject to penalties imposed by the Internal Revenue
Service. Any amount paid as backup withholding does not constitute an
additional tax and will be creditable against the holder's federal income tax
liability. Each holder of Shares should consult with his or her own tax
advisor as to his or her qualification for exemption from backup withholding
and the procedure for obtaining such exemption. Holders tendering their Shares
in the Offer may prevent backup withholding by completing the Substitute Form
W-9 included in the Letter of Transmittal. See Section 2. Similarly, holders
who convert their Shares into cash in the Merger may prevent backup
withholding by completing a Substitute Form W-9 and submitting it to the
paying agent for the Merger.
 
6. PRICE RANGE OF SHARES; DIVIDENDS.
 
  The Shares are traded on NASDAQ under the symbol ATCS. Prior to August 23,
1995, the Shares were listed on the NASDAQ Small Cap Market under the symbol
ATCE. The following table sets forth for the periods indicated the high and
low sales prices per Share on NASDAQ as reported by the Company in its 1997
Annual Report on Form 10-K with respect to the fiscal years ended February 29,
1996 and February 28, 1997, and as reported by published financial sources
with respect to periods after February 28, 1997. Price information with
respect to periods prior to August 23, 1995 does not represent actual
transactions.
 
<TABLE>
<CAPTION>
                                                                   HIGH   LOW
                                                                  ------ ------
   <S>                                                            <C>    <C>
   Fiscal Year Ended February 29, 1996:
     First Quarter............................................... $18.38 $ 8.88
     Second Quarter (through August 22, 1995).................... $15.75 $13.25
     Second Quarter (August 23 through August 31, 1995).......... $15.13 $13.75
     Third Quarter............................................... $17.00 $12.00
     Fourth Quarter.............................................. $13.50 $10.50
   Fiscal Year Ended February 28, 1997:
     First Quarter............................................... $15.88 $11.88
     Second Quarter.............................................. $15.38 $12.25
     Third Quarter............................................... $13.75 $10.38
     Fourth Quarter.............................................. $10.63 $ 7.25
   Year Ending February 28, 1998:
     First Quarter............................................... $11.50 $ 7.88
     Second Quarter.............................................. $12.00 $10.63
     Third Quarter (through November 26, 1997)................... $13.06 $10.56
</TABLE>
 
  On October 16, 1997, the last full day of trading prior to the public
announcement by the Company of the Offeror's offer to purchase all outstanding
Shares at $12.00 per Share, the closing price per Share as reported on NASDAQ
was $12.00. On November 26, 1997, the last full day of trading prior to the
commencement of the Offer, the closing price per Share as reported on NASDAQ
was $11.06. STOCKHOLDERS ARE URGED TO OBTAIN CURRENT MARKET QUOTATIONS FOR THE
SHARES.
 
7. CERTAIN EFFECTS OF THE TRANSACTION.
 
  Market for the Shares. The purchase of the Shares by the Offeror pursuant to
the Offer will reduce the number of Shares that might otherwise trade publicly
and will reduce the number of holders of Shares, which will adversely affect
the liquidity and market value of the remaining Shares held by stockholders
other than the Offeror.
 
 
                                      12
<PAGE>
 
  NASDAQ Listing. Depending upon the number of Shares purchased pursuant to
the Offer, the Shares may no longer meet the standards for continued inclusion
in NASDAQ, which require that an issuer have at least 100,000 publicly held
shares with a market value of at least $200,000, held by at least 300
shareholders, and have at least two registered market makers. If these
standards are not met, the Shares might nevertheless continue to be quoted in
the over-the-counter "additional list" or in one of the "local lists", but if
the number of holders of the Shares falls below 300, or if the number of
publicly held Shares falls below 100,000 or there are not at least two
registered and active market makers for the Shares, the Shares would no longer
be "qualified" for NASDAQ reporting and NASDAQ would cease to provide any
quotations. Shares held directly or indirectly by directors, officers or
beneficial owners of more than 10% of the Shares are not considered as being
publicly held for this purpose. In the event the Shares were no longer
eligible for NASDAQ quotation, quotations might still be available from other
sources. The extent of the public market for the Shares and the availability
of such quotations would, however, depend on the number of holders of Shares
remaining at such time, the interest in maintaining a market in the Shares on
the part of securities firms, the possible termination of registration under
the Exchange Act, as described below, and other factors. According to the
Company, as of November 12 , 1997, there were approximately 583 holders of
record of Shares and 7,083 beneficial owners of Shares and as of November 12,
1997, there were 7,930,107 Shares outstanding.
 
  Exchange Act Registration. The Shares are currently registered under the
Exchange Act. Such registration may be terminated upon application by the
Company to the Commission if the Shares are not listed on a national
securities exchange and there are fewer than 300 record holders of Shares. It
is the intention of the Offeror to seek to cause an application for such
termination to be made as soon after consummation of the Offer as the
requirements for termination of registration of the Shares are met. If such
registration were terminated, the Company would no longer legally be required
to disclose publicly in proxy materials distributed to stockholders the
information which it now must provide under the Exchange Act or to make public
disclosure of financial and other information in annual, quarterly and other
reports required to be filed with the Commission under the Exchange Act; and
the officers, directors and 10% stockholders of the Company would no longer be
subject to the "short-swing" insider trading reporting and profit recovery
provisions of the Exchange Act. Furthermore, if such registration were
terminated, persons holding "restricted securities" of the Company may be
deprived of their ability to dispose of such securities under Rule 144 or 144A
promulgated under the Securities Act of 1933, as amended (the "Securities
Act").
 
  If the registration of the Shares is not terminated prior to the Merger,
then the Shares will be delisted from all stock exchanges and the registration
of the shares under the Exchange Act will be terminated following the
consummation of the Merger.
 
  Margin Regulations. The Shares are currently "margin securities" under the
regulations of the Board of Governors of the Federal Reserve System (the
"Federal Reserve Board"), which has the effect, among other things, of
allowing brokers to extend credit on the collateral of the Shares. Depending
upon factors similar to those described above regarding listing and market
quotations, it is possible that, following the Offer, the Shares would no
longer constitute "margin securities" for the purposes of the margin
regulations of the Federal Reserve Board and therefore could no longer be used
as collateral for loans made by brokers. If registration of Shares under the
Exchange Act were terminated, the Shares would no longer be "margin
securities."
 
8. CERTAIN INFORMATION CONCERNING THE COMPANY.
 
  Except as otherwise set forth herein, the information concerning the Company
contained in this Offer to Purchase, including financial information, has been
taken from or based upon publicly available documents and records on file with
the Commission and other public sources. Although neither the Offeror nor
Parent has any knowledge that would indicate that statements contained herein
based upon such documents are untrue, neither the Offeror, any affiliate of
the Offeror nor the Dealer Manager or Information Agent assumes any
responsibility for the accuracy or completeness of the information concerning
the Company, furnished by the Company, or contained in such documents and
records or for any failure by the Company to disclose events which may have
 
                                      13
<PAGE>
 
occurred or may affect the significance or accuracy of any such information
but which are unknown to the Offeror or its affiliates.
 
  The Company is a corporation organized under the laws of Delaware with its
principal executive offices located at 104 East 25th Street, New York, New
York 10010. The Company is a specialized provider of technical and project
management services, primarily including environmental consulting and
engineering services and information technology services to businesses and
governmental agencies at the federal, state and local levels.
 
  Recent Developments. The Offeror has been advised by the Company of the
following: (i) On November 26, 1997, the Company completed the purchase of all
of the outstanding stock of Bing Yen & Associates ("Bing Yen") for a total
purchase price of $5.4 million. Bing Yen provides geotechnical and forensic
structural services to a wide variety of clients in the western United States;
(ii) On November 4, 1997, the Company purchased for approximately $1.5 million
all the outstanding stock of Environmental Warranty, Inc. ("EWI"), a managing
general agent for a major insurance company. EWI sells insurance products
covering environmental liabilities to large property owners and municipal
government clients; and (iii) On August 20,
1997, the Company purchased certain assets and assumed certain liabilities of
the environmental consulting and engineering services of Smith Technology
Corporation, which operated primarily as BCM Engineers, Inc. ("BCM") for a
purchase price of $12.5 million.
 
  Set forth below is certain summary consolidated financial data with respect
to the Company excerpted or derived from financial information contained in
the Company's 1997 Form 10-K. More comprehensive financial information is
included in such Form 10-K and other documents filed by the Company with the
Commission, and the following summary is qualified in its entirety by
reference to such reports and such other documents and all the financial
information (including any related notes) contained therein. Such Form 10-K
and other documents should be available for inspection and copies thereof
should be obtainable in the manner set forth below under "--Available
Information."
 
                                      14
<PAGE>
 
                            ATC GROUP SERVICES INC.
 
                  SELECTED CONSOLIDATED FINANCIAL INFORMATION
                     (IN THOUSANDS, EXCEPT PER SHARE DATA)
 
<TABLE>
<CAPTION>
                                            FOR YEARS ENDED FEBRUARY 28 (29),
                                           ------------------------------------
                                               1997        1996        1995
                                           ------------ ----------- -----------
   <S>                                     <C>          <C>         <C>
   STATEMENT OF OPERATIONS DATA
     Revenues............................. $    113,855 $    44,965 $   36,272
     Income before income taxes...........       10,398       5,671      5,301
     Net income...........................        6,308       3,866      3,257
     Net earnings (loss) per share........          .74         .54        .56
<CAPTION>
                                           AS OF FEBRUARY 28 (29),
                                           ------------------------
                                               1997        1996
                                           ------------ -----------
   <S>                                     <C>          <C>         <C>
   BALANCE SHEET DATA
     Total current assets.................       45,444      31,312
     Total assets.........................       86,294      46,685
     Total current liabilities............       17,743       6,335
     Long-term debt (less current maturi-
      ties)...............................       22,123         362
     Total stockholders' equity...........       45,439      39,192
</TABLE>
 
  Certain Projections. To the knowledge of Parent and the Offeror, the Company
does not as a matter of course make public forecasts as to its future
financial performance. However, in connection with a proposed sale of the
Company, certain employees of the Company prepared certain financial
projections in early fiscal 1997 and furnished copies thereof to Parent and
the Offeror in September 1997. Neither Parent, the Offeror nor the Company
verified the accuracy of such financial forecasts and neither the Parent nor
the Offeror relied on them in evaluating whether or not to proceed with the
Offer.
 
  The projections presented in the tables below (the "Projections") are
derived or excerpted from the financial forecasts provided to Parent and the
Offeror in September 1997 by certain employees of the Company and are based on
numerous assumptions concerning future events. The Projections have not been
adjusted to reflect the effects of the Offer or the Merger or the incurrence
of indebtedness in connection therewith. The Projections should be read
together with the other information contained in this Section 8.
 
                 PRELIMINARY FORECASTS PREPARED EXCLUSIVELY BY
                     CERTAIN EMPLOYEES OF THE COMPANY (1)
                        WITHOUT FUTURE ACQUISITIONS (2)
                             (DOLLARS IN MILLIONS)
 
<TABLE>
<CAPTION>
                                              FOR YEARS ENDED FEBRUARY 28 (29),
                                             -----------------------------------
                                                1997        1998P       1999P
                                             ----------- ----------- -----------
   <S>                                       <C>         <C>         <C>
   Sales.................................... $     113.9 $     133.5 $     140.8
   Net income...............................         6.3         6.0         6.8
</TABLE>
- --------
(1) Preliminary forecasts were prepared in early fiscal 1997 by certain
    employees of the Company and were not independently verified by Parent or
    the Offeror.
(2) Only includes acquisitions completed as of February 1997. Does not include
    subsequent acquisitions such as BCM, EWI or Bing Yen.
 
                                      15
<PAGE>
 
                 PRELIMINARY FORECASTS PREPARED EXCLUSIVELY BY
                     CERTAIN EMPLOYEES OF THE COMPANY (1)
                         WITH FUTURE ACQUISITIONS (2)
                             (DOLLARS IN MILLIONS)
 
<TABLE>
<CAPTION>
                                              FOR YEARS ENDED FEBRUARY 28 (29),
                                             -----------------------------------
                                                1997        1998P       1999P
                                             ----------- ----------- -----------
   <S>                                       <C>         <C>         <C>
   Sales.................................... $     113.9 $     151.7 $     206.4
   Net income...............................         6.3         8.5        14.1
</TABLE>
- --------
(1) Preliminary forecasts were prepared in early fiscal 1997 by certain
    employees of the Company and were not independently verified by the
    Company, Parent or the Offeror.
(2) For fiscal 1998, projections assume BCM is acquired as of October 1, 1997,
    Bing Yen is acquired as of July 1, 1997 and EWI is acquired as of June 1,
    1997. In fiscal 1999, projections reflect the assumed financial impact of
    two hypothetical acquisitions, including an assumed $25 million increase
    in sales.
 
  THE PROJECTIONS WERE NOT PREPARED WITH A VIEW TO PUBLIC DISCLOSURE OR
COMPLIANCE WITH PUBLISHED GUIDELINES OF THE COMMISSION OR THE GUIDELINES
ESTABLISHED BY THE AMERICAN INSTITUTE OF CERTIFIED PUBLIC ACCOUNTANTS
REGARDING PROJECTIONS OR FORECASTS AND ARE INCLUDED HEREIN ONLY BECAUSE SUCH
INFORMATION WAS PROVIDED TO PARENT AND THE OFFEROR. THESE FORWARD-LOOKING
STATEMENTS ARE SUBJECT TO CERTAIN RISKS AND UNCERTAINTIES THAT COULD CAUSE
ACTUAL RESULTS TO DIFFER MATERIALLY FROM THE PROJECTIONS. THE PROJECTIONS
REFLECT NUMEROUS ASSUMPTIONS, ALL MADE BY CERTAIN EMPLOYEES OF THE COMPANY,
WITH RESPECT TO INDUSTRY PERFORMANCE, GENERAL BUSINESS, ECONOMIC, MARKET AND
FINANCIAL CONDITIONS AND OTHER MATTERS, INCLUDING HYPOTHETICAL ACQUISITION
ASSUMPTIONS AND ASSUMED INTEREST EXPENSE AND EFFECTIVE TAX RATES, ALL OF WHICH
ARE DIFFICULT TO PREDICT, MANY OF WHICH ARE BEYOND THE COMPANY'S CONTROL AND
NONE OF WHICH WERE SUBJECT TO APPROVAL BY PARENT OR THE OFFEROR. ACCORDINGLY,
THERE CAN BE NO ASSURANCE THAT THE ASSUMPTIONS MADE IN PREPARING THE
PROJECTIONS WILL PROVE ACCURATE, AND ACTUAL RESULTS MAY BE MATERIALLY GREATER
OR LESS THAN THOSE CONTAINED IN THE PROJECTIONS. THE INCLUSION OF THE
PROJECTIONS HEREIN SHOULD NOT BE REGARDED AS AN INDICATION THAT ANY OF PARENT,
THE OFFEROR, THE COMPANY OR THEIR RESPECTIVE FINANCIAL ADVISORS CONSIDERED OR
CONSIDER THE PROJECTIONS TO BE A RELIABLE PREDICTION OF FUTURE EVENTS, AND THE
PROJECTIONS SHOULD NOT BE RELIED UPON AS SUCH. NONE OF PARENT, THE OFFEROR,
THE COMPANY AND THEIR RESPECTIVE FINANCIAL ADVISORS ASSUMES ANY RESPONSIBILITY
FOR THE VALIDITY, REASONABLENESS, ACCURACY OR COMPLETENESS OF THE PROJECTIONS.
NONE OF PARENT, THE OFFEROR, THE COMPANY AND THEIR RESPECTIVE FINANCIAL
ADVISORS HAS MADE, OR MAKES, ANY REPRESENTATION TO ANY PERSON REGARDING THE
INFORMATION CONTAINED IN THE PROJECTIONS AND NONE OF THEM INTENDS TO UPDATE OR
OTHERWISE REVISE THE PROJECTIONS TO REFLECT CIRCUMSTANCES EXISTING AFTER THE
DATE WHEN MADE OR TO REFLECT THE OCCURRENCE OF FUTURE EVENTS EVEN IN THE EVENT
THAT ANY OR ALL OF THE ASSUMPTIONS UNDERLYING THE PROJECTIONS ARE SHOWN TO BE
IN ERROR.
 
  Available Information. The Company is subject to the informational
requirements of the Exchange Act and in accordance therewith files periodic
reports, proxy statements and other information with the Commission relating
to its business, financial condition and other matters. The Company is
required to disclose in such proxy statements certain information, as of
particular dates, concerning the Company's directors and officers, their
remuneration, stock options granted to them, the principal holders of the
Company's securities and any material interests of such persons in
transactions with the Company. Such reports, proxy statements and other
information may be inspected at the public reference facilities maintained by
the Commission at Room 1024, 450 Fifth Street, N.W., Washington, D.C. 20549,
and at the regional offices of the Commission located at Seven World Trade
Center, 13th Floor, New York, New York 10048 and Citicorp Center, 500 West
Madison Street (Suite 400), Chicago, Illinois 60661. Copies of such material
may also be obtained by mail, at prescribed rates, from the Commission's
principal office at 450 Fifth Street, N.W., Washington, D.C. 20549. Such
material may also be accessed electronically by means of the Commission's
World Wide Web site on the internet at http://www.sec.gov. Such material
should also be available for inspection at the offices of NASDAQ, 1735 K
Street, N.W., Washington, D.C. 20006.
 
                                      16
<PAGE>
 
9. CERTAIN INFORMATION CONCERNING THE WPG FUND, THE WPG OVERSEAS FUND, PARENT
   AND THE OFFEROR
 
  The Offeror, a Delaware corporation, is a wholly owned subsidiary of Parent.
To date, the Offeror has not conducted any business other than that incident
to its formation, the execution and delivery of the Merger Agreement and the
commencement of the Offer. It is not anticipated that, prior to the
consummation of the Offer and the Merger, the Offeror or Parent will have any
significant assets or liabilities or will engage in any activities other than
those incident to the Offer and the Merger and the financing thereof. The
principal executive office of the Offeror is located c/o Weiss, Peck & Greer,
L.L.C., One New York Plaza, 30th Floor, New York, New York 10004.
 
  Parent, a Delaware corporation, is a holding company and has not conducted
any business other than that incident to its formation and the execution and
delivery of the Merger Agreement. The common stock of Parent is currently
owned 100% by the WPG Fund, but it is anticipated that the WPG Overseas Fund
will purchase approximately 13% of the equity of Parent prior to the Merger.
The principal executive office of Parent is located c/o Weiss, Peck & Greer,
L.L.C., One New York Plaza, 30th Floor, New York, New York 10004.
 
  The WPG Fund, a Delaware limited partnership, is a private investment fund
headquartered in New York. The sole general partner of the WPG Fund is WPG
Private Equity Partners II, L.L.C., a Delaware limited liability company ("WPG
Partners II"). The offices of each of the WPG Fund and WPG Partners II are
located c/o Weiss, Peck & Greer, L.L.C., One New York Plaza, 30th Floor, New
York, New York 10004.
 
  The WPG Overseas Fund, a Cayman Islands exempted limited partnership, is a
private investment fund headquartered in Grand Cayman Islands, British West
Indies. The general partners of the WPG Overseas Fund are WPG Private Equity
Partners II (Overseas), L.L.C., a Delaware limited liability company ("WPG
Partners II (Overseas)"), and WPG CDA V (Overseas), Ltd., a Cayman Islands
limited corporation ("WPG CDA V (Overseas)"). The offices of each of the WPG
Overseas Fund and its general partners are located c/o BankAmerica Trust and
Banking Corporation (Cayman) Limited, BankAmerica House, Fort Street,
Georgetown, Grand Cayman Island, British West Indies.
 
  The name, citizenship, business address, present principal occupation and
material positions held during the past five years of the (i) managing members
of WPG Partners II and WPG Partners II (Overseas) and (ii) the directors and
executive officers of Parent, the Offeror and WPG CDA V (Overseas) are set
forth in Annex I to this Offer to Purchase.
 
  The WPG Fund and the WPG Overseas Fund intend to offer members of the
management buyout team from the Company, led by Nicholas J. Malino and
Christopher P. Vincze (the "Management Team"), an opportunity to acquire an
equity interest in Parent or in the Surviving Corporation. While general
discussions have been held with certain members of the Management Team, and it
is expected that senior executive and operating management will be offered
equity ownership in an aggregate amount of approximately $2.5 million, no
decisions have been made at this time, either as to the identity of the
persons who may be offered the opportunity to invest in Parent or in the
Surviving Corporation or as to the precise nature of any equity interest any
members of the Management Team may be offered. If and to the extent members of
the Management Team are given the opportunity to, and do, invest in such
equity, the equity interests of the WPG Fund and the WPG Overseas Fund in
Parent or in the Surviving Corporation would be reduced on a pro rata basis.
 
  Pursuant to the Stockholders Agreement, dated as of October 17, 1997, among
Parent and the stockholders who are parties thereto, granting Parent an
irrevocable proxy with respect to the voting of 1,170,030 Shares in favor of
the Merger, Parent may be deemed beneficially to own such Shares, representing
14.99% of the issued and outstanding Shares. Each of the Offeror, Parent, the
WPG Fund and the WPG Overseas Fund disclaims beneficial ownership of such
shares. Except as described in this Offer to Purchase, none of the Offeror,
Parent, the WPG Fund, the WPG Overseas Fund or, to the best knowledge of the
Offeror, any of the persons listed in Annex I to this Offer to Purchase owns
or has any right to acquire any Shares and none of them has effected any
transaction in the Shares during the past 60 days.
 
 
                                      17
<PAGE>
 
  Pursuant to the Stockholders Agreement, Parent has agreed to cause the
Company, on the one hand, and each of George Rubin, Chairman of the Board of
Directors of the Company, and Morry F. Rubin, President, Chief Executive
Officer and a director of the Company, on the other hand (together, the
"Rubins"), have agreed to enter into a Severance, Consulting and Non-
Competition Agreement (collectively, the "Severance Agreements") at the time
of the Merger pursuant to which the Rubins would resign as employees of the
Company on and as of the effectiveness of the Merger. The Rubins will resign
as directors of the Company at the time of the completion of the Offer. Under
the Severance Agreements the Rubins would be required, for a period of three
years following the effective date of the Merger, to perform consulting
services as requested by the Company. The Severance Agreements would also
restrict the Rubins, for periods ranging from three to four years, from (i)
competing in any aspect of the Company's business as conducted on the
effective date of the Merger anywhere in the United States; (ii) requesting or
causing any employee of the Company to terminate employment with the Company;
(iii) competing with ATC InSys Inc. or 3D Information Services, Inc. anywhere
in the State of the New Jersey or soliciting certain customers of ATC InSys
Inc. within New York City. In consideration for these agreements, the Company
would be required to pay to each of the Rubins $1,550,000 upon the effective
date of the Merger and $276,715 on the first day of each calendar quarter
thereafter, commencing on the first such day that occurs at least one month
following the effective date of the Merger and terminating with the sixth such
payment; and to continue for an agreed-upon time certain benefits currently
provided by the Company.
 
  Except as set forth in this Offer to Purchase, none of the Offeror, Parent,
the WPG Fund, the WPG Overseas Fund or, to the best knowledge of the Offeror,
any of the persons listed in Annex I hereto, has any contract, arrangement,
understanding or relationship with any other person with respect to any
securities of the Company, including, but not limited to, any contract,
arrangement, understanding or relationship concerning the transfer or the
voting of any such securities, joint ventures, loan or option arrangements,
puts or calls, guaranties of loans, guaranties against loss or the giving or
withholding of proxies. Except as set forth in this Offer to Purchase, there
have been no contacts, negotiations or transactions between the WPG Fund, the
WPG Overseas Fund, the Offeror or Parent, or, to the best of their knowledge,
any of the persons listed in Annex I hereto, on the one hand, and the Company
or its affiliates, on the other hand, concerning a merger, consolidation or
acquisition, a tender offer or other acquisition of securities, an election of
directors, or a sale or other transfer of a material amount of assets. Except
as described in this Offer to Purchase, none of the WPG Fund, the WPG Overseas
Fund, the Offeror, Parent or, to the best knowledge of Parent or the Offeror,
any of the persons listed in Annex I hereto, has had any transaction with the
Company or any of its executive officers, directors or affiliates that would
require disclosure under the rules and regulations of the Commission
applicable to the Offer.
 
10. SOURCE AND AMOUNT OF FUNDS.
 
  The Offer is conditioned upon, among other things, the Offeror receiving the
proceeds of financing pursuant to the Commitment Letter and as described in
the Highly Confident Letter (both as defined below) or involving such other
financing sources as Parent and the Company shall reasonably agree and are not
materially more onerous, in amounts sufficient to consummate the Offer and the
Merger, including without limitation, (i) to pay the Merger Consideration with
respect to all Shares in the Offer and the Merger, (ii) to refinance certain
outstanding indebtedness of the Company, (iii) to pay for any fees and
expenses in connection with the Offer and the Merger or the financing thereof
and (iv) to provide for the working capital needs of the Company following the
Merger, including, without limitation, if applicable, letters of credit.
 
  Parent and the Offeror estimate that the total amount of funds required by
the Purchaser to (i) purchase all of the Shares pursuant to the Offer and
finance the Merger Consideration, (ii) refinance certain existing indebtedness
of the Company, (iii) pay fees and expenses incurred in connection with the
Offer and the Merger and (iv) provide additional working capital for the
Company will be approximately $157 million. Of these funds, it is anticipated
that (i) approximately $2.5 million will be obtained from an equity
contribution by the Management Team and certain Company employees (including
the rollover of the Offer proceeds with respect to Shares and options to
acquire Shares owned by certain members of the Management Team into capital
stock of the Surviving Corporation) (the "Management Equity Contribution"),
(ii) approximately $22 million will be
 
                                      18
<PAGE>
 
obtained from an equity contribution from the WPG Fund and approximately $3
million will be obtained from an equity contribution from the WPG Overseas
Fund (both equity contributions, together with the Management Equity
Contribution, the "Equity Contributions"), (iii) approximately $100 million
will be obtained from the proceeds of an offering (the "Note Offering") of
Senior Subordinated Notes Due 2008 of the Offeror (the "Notes") pursuant to
Rule 144A of the Securities Act, to become obligations of the Surviving
Corporation, the anticipated principal terms of which are described below,
(iv) approximately $9.0 million will be financed through a $30 million
revolving credit facility (the "Revolving Credit Facility"), the principal
terms of which are described below, and (v) approximately $20 million will be
available pursuant to a term loan facility (the "Term Loan Facility"), the
terms of which are described below. The Revolving Credit Facility and Term
Loan Facility are referred to collectively as the "Senior Secured Financing."
The WPG Fund has received a letter from BT Alex. Brown Incorporated ("BTAB")
dated November 25, 1997 (the "Highly Confident Letter") indicating that, based
upon market conditions existing at the time of delivery of the Highly
Confident Letter and subject to certain terms and conditions, BTAB was highly
confident of its ability to sell or place the Notes. The Highly Confident
Letter is filed as an exhibit to the Tender Offer Statement on Schedule 14D-1
of the Offeror filed on December 4, 1997 and is available for inspection and
copying by any Stockholder of the Company, or representative of such
Stockholder who has been so designated in writing, at the principal executive
offices of the Company. Additionally, the WPG Fund has received a letter dated
November 26, 1997 (the "Commitment Letter") from Bankers Trust Company
("BTCo") stating that, subject to the conditions set forth in such letter,
BTCo has committed to provide the Senior Secured Financing.
 
  The Note Offering. In connection with the Offer and the Merger, the Offeror
will issue and sell at least $100 million aggregate principal amount of debt
securities of the Offeror through the Note Offering. The following description
of the Highly Confident Letter is qualified in its entirety by reference to
the actual terms of the Highly Confident Letter. The interest rate on the
Notes, and the other terms of the Notes, will depend upon interest rate and
market conditions at the time the Notes are placed. However, it is anticipated
that the Notes will have the following features: (i) a maturity of ten years
from issue date, (ii) be subordinated to all senior indebtedness of the
Company, including the Senior Secured Financing, and senior to any
subordinated indebtedness of the Company (in each case after consummation of
the Merger and assumption of the obligations under the Notes by the Surviving
Corporation), (iii) have semiannual interest payment dates beginning in 1998,
(iv) have non-call and redemption provisions to be determined, (v) have
subsequent registration rights and (vi) have such other or different terms as
the Offeror agrees. The Notes will also contain covenants that are customary
for similar transactions and financings including restrictions on dividends,
stock repurchases, liens, indebtedness, affiliate transactions, asset sales
and mergers. The Highly Confident Letter states that BTAB's conclusion is
subject to specified customary conditions.
 
  Revolving Credit Facility. The WPG Fund has obtained a commitment from BTCo
to make available to the Company the Revolving Credit Facility. The final
maturity of the Revolving Credit Facility will be five years from the closing
date of the Merger, with all loans made thereunder to be repaid as a bullet
payment on such date and with all letters of credit issued thereunder to
terminate by such date. The Revolving Credit Facility is expected to be used
in the future for general working capital purposes and general corporate
purposes, although a portion may be used to effect the refinancing of certain
existing indebtedness and to pay fees and expenses incurred in connection with
the Offer and the Merger and related financings. Parent and each direct and
indirect subsidiary of the Company (collectively, the "Guarantors") will
provide unconditional guaranties of all amounts owing under the Revolving
Credit Facility. Additionally, the Revolving Credit Facility will be secured
by (i) a first priority perfected pledge of all (a) notes owned by the Company
and the Guarantors and (b) all capital stock owned by the Company and the
Guarantors (excluding all Shares purchased pursuant to the Offer, it being
understood that all shares of capital stock of the Surviving Corporation shall
be required to be pledged only from and after the consummation of the Merger)
and (ii) a first priority perfected security interest in all other assets
owned by the Company and the Guarantors, subject to certain exceptions
(collectively, the "Collateral"). Loans made under the Revolving Credit
Facility may be maintained from time to time as (i) base rate loans, which
will bear interest at the Applicable Margin (as defined below) plus the base
rate in effect from time to time or (ii) reserve adjusted Eurodollar ("RAE")
loans, which will bear interest at the Applicable Margin (as defined below)
plus the Eurodollar rate (adjusted for maximum reserves) as determined by BTCo
for the respective interest
 
                                      19
<PAGE>
 
period. A commitment fee will be paid with respect to the unutilized total
commitment under the Revolving Credit Facility in an amount equal to 50 basis
points per annum, payable quarterly and upon the termination of the Revolving
Credit Facility. The Company will also pay customary funding and letter of
credit fees. "Applicable Margin" shall mean a percentage per annum equal to
(i) in the case of base rate loans, 1.25% and (ii) in the case of RAE loans,
2.25%. The Applicable Margin will be adjusted quarterly based on a leverage
formula to be agreed upon.
 
  Loans made under the Revolving Credit Facility may be prepaid voluntarily by
the Company at any time without premium or penalty, subject to customary
breakage costs associated with RAE loans. The Company will be required to
repay loans made under the Revolving Credit Facility with (i) 100% of the net
proceeds from asset dispositions, (i) 100% of the net proceeds of issuances of
indebtedness, (iii) 100% of the net proceeds from insurance recovery and
condemnation events, (iv) 50% of the net proceeds from equity issuances and
capital contributions and (v) 75% of annual excess cash flow in respect of the
first year of the Senior Secured Financing and 50% of annual excess cash flow
for each year thereafter, in each case with certain customary exceptions. In
addition, to the extent the aggregate principal amount of all outstanding
loans made under the Revolving Credit Facility exceeds the total Revolving
Credit Facility commitment, the Company will be required to make a prepayment
in the amount of such excess.
 
  The Revolving Credit Facility will contain certain affirmative and negative
covenants customary for this type of facility. The covenants will impose
limitations upon, among other things, the ability of the Company and its
subsidiaries to (i) incur liens; (ii) merge, consolidate or acquire or dispose
of assets; (iii) incur other indebtedness; (iv) engage in certain transactions
with affiliates and form subsidiaries; (v) make investments or enter into
joint ventures and partnerships; (vi) enter into sale-leaseback transactions
or make lease payments; (vii) pay dividends; (viii) make voluntary prepayments
of or amend other debt; (ix) make capital expenditures and (x) amend their
organizational documents. The covenants also will include certain financial
covenants customary for a transaction of this type.
 
  The Revolving Credit Facility will include representations and warranties
from the Offeror, Parent and the Company that are customary for this type of
financing.
 
  The Revolving Credit Facility will include conditions precedent typical for
this type of credit facility, including, without limitation, (i) for the
initial loans, (a) the consummation of the Merger, (b) the receipt by Parent
of at least $27.5 million from the Equity Contributions and the contribution
of the Equity Contributions to the Offeror in exchange for 100% of the common
stock of the Offeror, (c) the receipt by the Offeror of gross cash proceeds of
either $100 million from the issuance of the Notes, (d) receipt by BTCo of
customary opinions of counsel, (e) the absence of any occurrence which has, or
could reasonably be expected to have, a material adverse effect on the
business, property, assets, operations, liabilities, condition (financial or
otherwise) or prospects of the Offeror, Parent, the Company or the Company and
its subsidiaries taken as a whole, and (ii) for all loans, (a) the absence of
any default or event of default under the Revolving Credit Facility or the
Term Loan Facility and (b) the continued material accuracy of the
representations and warranties.
 
  The Revolving Credit Facility will include customary events of default
typical for this type of financing, including, without limitation, a default
on a change in control of the Offeror, Parent or the Company. The Revolving
Credit Facility will include certain other customary provisions, including,
without limitation, indemnification rights for the Indemnified Parties (as
defined in the Commitment Letter), expense payment undertakings and other
terms as agreed upon by the parties.
 
  All commitments in respect of the Revolving Credit Facility will terminate
on February 28, 1998, unless (i) definitive documents for the Revolving Credit
Facility and the Term Loan Facility have been executed and delivered and (ii)
the Offer, the Merger and the refinancing of certain indebtedness of the
Company have been consummated, in each case before such date.
 
  Term Loan Facility. The WPG Fund has obtained a commitment from BTCo to make
available to the Company the Term Loan Facility, which will be in the amount
of $20 million. The Term Loan Facility will mature on the fifth anniversary
after the closing of the Merger. The Term Loan Facility is expected to be used
to
 
                                      20
<PAGE>
 
refinance certain existing indebtedness of the Company. The Guarantors will
provide unconditional guaranties of all amounts owing under the Term Loan
Facility. Additionally, the Term Loan Facility (and all obligations of the
Guarantors) will be secured by the Collateral. Loans made under the Term Loan
Facility may be maintained from time to time as (i) base rate loans, which
will bear interest at the Applicable Margin plus the base rate in effect from
time to time or (ii) RAE loans, which will bear interest at the Applicable
Margin plus the Eurodollar rate (adjusted for maximum reserves) as determined
by BTCo for the respective interest period.
 
  The Term Loan Facility will also include voluntary and mandatory pre-payment
and repayment terms, commitment termination provisions, representations and
warranties, the conditions precedent, covenants, events of default and
additional provisions that are substantially similar to those in the Revolving
Credit Facility.
 
11. BACKGROUND OF THE OFFER; PAST CONTACTS, TRANSACTIONS OR NEGOTIATIONS WITH
THE COMPANY.
 
  On August 5, 1997, the management of the WPG Fund received an inquiry,
through Chadbourne & Parke LLP, counsel to the WPG Fund, as to the interest of
the WPG Fund in meeting with the Management Team. The WPG Fund expressed a
willingness to meet with members of the Management Team to discuss a possible
transaction.
 
  On September 3, 1997, the Management Team contacted the management of the
WPG Fund to engage in preliminary discussions regarding a possible
transaction. The parties met on September 8, 1997 and on a number of days
subsequent thereto to discuss the Company's operations, strategy and
prospects. During this period and up until the execution of the Merger
Agreement, the WPG Fund conducted certain due diligence investigations.
 
  On September 19, 1997, the Management Team and management of the WPG Fund
met with two stockholders of the Company, George Rubin and Morry F. Rubin,
who, in the aggregate, own approximately 24 percent of the Shares on a fully
diluted basis, in their capacity as stockholders of the Company (the
"Stockholders"), to discuss the terms of a potential transaction and to
discuss a possible stockholders agreement (the "Stockholders Agreement"),
pursuant to which, for a period of time ending upon the earlier of the date of
the consummation of the Merger and the date that would be one year from the
date of the Stockholders Agreement, (i) the Stockholders would grant Parent an
irrevocable proxy to vote that number of the Stockholders' Shares that equals
14.99 percent of the outstanding Shares of the Company (the "Proxy Shares") in
favor of the potential transaction contemplated by the WPG Fund, (ii) the
Stockholders would give Parent the right to receive all consideration above
$12.00 per Share received by the Stockholders with respect to all of the
Stockholders' Shares and options or other rights to acquire Shares in the
event that the Company is acquired by a party other than the WPG Fund or its
affiliates at a price above $12.00 per Share, (iii) the Stockholders would
enter into severance agreements on and as of the date of the Merger (which
severance agreements are more fully described in Section 9), and (iv) Parent
would negotiate a merger agreement in good faith and use its commercially
reasonable efforts to consummate the Merger on mutually acceptable terms.
 
  A number of other meetings and discussions took place among the Management
Team, the Stockholders and the management of the WPG Fund from September 22,
1997 through October 16, 1997.
 
  On October 17, 1997, the Stockholders entered into the Stockholders
Agreement with Parent. On the same day, the WPG Fund delivered to the Board of
Directors of the Company its proposal (the "WPG Proposal") to purchase all
outstanding Shares for $12.00 per Share, and the Company publicly announced
that it had received an offer relating to an acquisition of all outstanding
Shares of the Company at $12.00 per Share.
 
  On October 20, 1997, the Board of Directors of the Company appointed a
special committee (the "Special Committee") comprised of the two independent
directors, Julia S. Heckman and Richard S. Greenberg, and empowered the
Special Committee to, among other things, evaluate and review the WPG
Proposal, to negotiate the terms of the WPG Proposal with the WPG Fund and to
recommend action to the full Board of Directors of the Company, all on behalf
of, and in furtherance of the best interests of, the non-affiliated
stockholders of the Company. The Board of Directors of the Company also
empowered the Special Committee to engage such advisors (including legal and
financial advisors) as it deemed necessary, and reaffirmed the previously
granted
 
                                      21
<PAGE>
 
indemnity agreement in favor of Ms. Heckman and Mr. Greenberg. The Special
Committee commenced review and analysis of the proposed form of merger
agreement initially prepared by legal counsel for the WPG Fund and the terms
of the merger as well as the terms of the Stockholders Agreement and the
Severance Agreements. On October 23, 1997, the Special Committee orally
retained its independent legal counsel. Such retention was subsequently
confirmed by written agreement dated October 27, 1997. During the week of
October 27, 1997, in consultation with its legal counsel, the Special
Committee initiated discussions and negotiations concerning the terms of the
proposed merger agreement and on October 28 and 29, 1997, interviewed several
prospective financial advisors. On October 31, 1997, the Special Committee
orally engaged Lehman Brothers Inc. ("Lehman Brothers") to render an opinion
with respect to the fairness, from a financial point of view, to the Company's
stockholders of the consideration to be offered to such stockholders by
affiliates of the WPG Fund and to assist in the Special Committee's
negotiations with respect to the proposed transaction. The Special Committee's
engagement of Lehman Brothers was subsequently formalized by a written
engagement letter dated November 12, 1997. During the week of November 3,
1997, the Special Committee, in consultation with its legal and financial
advisors, prepared its initial comments concerning the terms and conditions of
the proposed merger agreement. Negotiations with respect thereto began during
the week of November 10 and continued through the date of the execution of the
Merger Agreement on November 26, 1997. The Special Committee took note of the
fact that the Rubins desired to terminate their investment in the Company and
that the Management Team wished to assume a more significant role in the
management of the Company. On November 12, 1997, the Special Committee met
with Lehman Brothers to discuss Lehman Brothers' preliminary analysis and
assessment of the financial aspects of the WPG Proposal and the draft merger
agreement proposed by the WPG Fund's legal advisors. During the week of
November 17, 1997, the Special Committee conferred on numerous occasions with
its legal counsel and Lehman Brothers concerning the WPG proposal and the
terms of the draft merger agreement initially proposed by legal counsel to the
WPG Fund and, through its legal advisors and Lehman Brothers, negotiated with
the WPG Fund's legal advisors.
 
  At a meeting of the Special Committee held on November 26, 1997, the Special
Committee, with the assistance of its independent legal counsel, considered
and discussed the terms and conditions of the Merger Agreement which reflected
changes made in response to their negotiations with the WPG Fund and its legal
counsel and received the final report of Lehman Brothers. At the November 26
meeting, the Special Committee (i) received the opinion of Lehman Brothers to
the effect that, as of the date of such opinion and based upon and subject to
the matters set forth in such opinion, the consideration to be received by the
Company's stockholders pursuant to the Offer and the Merger Agreement is fair
to the Company's stockholders from a financial point of view, and (ii)
resolved to recommend to the full Board of Directors that the Company enter
into a transaction with the WPG Fund on the terms set forth in the Merger
Agreement.
 
  At a meeting of the Board of Directors of the Company held immediately after
the Special Committee meeting, the Special Committee gave its report to the
full Board of Directors and made its recommendation to approve the transaction
with the WPG Fund on the terms set forth in the Merger Agreement.
 
  On November 26, 1997, by unanimous vote, after disclosure by the
Stockholders of their interests in the Offer and the Merger, including the
Stockholders Agreement and the Severance Agreements contemplated thereby, and
the receipt of the positive recommendation of the Special Committee, the full
Board of Directors of the Company adopted resolutions approving the Merger
Agreement, Offer and the Merger. The Company's Board of Directors also adopted
resolutions (i) determining that the terms of the Offer and the Merger are
fair to, adequate, and in the best interest of the Company's stockholders and
(ii) recommending that the Company's stockholders accept the Offer, tender
their Shares pursuant to the Offer and adopt the Merger Agreement.
 
12. PURPOSE OF THE OFFER AND THE MERGER; PLANS FOR THE COMPANY.
 
  Purpose. The purpose of the Offer is to enable Parent to acquire control of,
and the entire equity interest in, the Company. The Offer, as the first step
in the acquisition of the Company, is intended to facilitate the acquisition
of all the Shares. Parent currently intends, as soon as practicable following
consummation of the Offer, to propose and seek to consummate the Merger. The
purpose of the Merger is to acquire all Shares not
 
                                      22
<PAGE>
 
tendered and purchased pursuant to the Offer. Pursuant to the Merger, each
then outstanding Share (other than Shares owned by the Offeror, Parent or any
of their subsidiaries, Shares held in the treasury of the Company and Shares
owned by the stockholders who properly perfect any appraisal rights under the
DGCL) would be converted into the right to receive an amount in cash equal to
the price per Share paid by the Offeror pursuant to the Offer. Upon the
acceptance for payment of 50.1% of the Shares by the Offeror, the Offeror will
have certain rights to designate a majority of the directors on the Company's
Board of Directors. See "The Merger Agreement--Board of Directors" in Section
13. The Company has agreed that, upon the acceptance for payment of 50.1% of
the Shares, the directors comprising the Special Committee will remain on the
Company's Board of Directors and the Offeror will designate three additional
directors to sit on the Board. Additionally, pursuant to the Severance
Agreements, on and as of the date of the Merger, the Stockholders will resign
their positions as officers of the Company. Further, the Offeror, Parent and
the WPG Fund intend that, from the date of the Merger, the members of the
Management Team will remain employed by and serve as officers of the Company
and that certain members of the Management Team will be entitled to purchase
equity in the Surviving Corporation.
 
  Appraisal Rights. Holders of Shares do not have appraisal rights as a result
of the Offer. However, if the Merger is consummated, holders of Shares at the
Effective Time will have certain rights pursuant to the provisions of Section
262 of the DGCL ("Section 262") to dissent and demand appraisal of their
Shares. Under Section 262, dissenting stockholders who comply with the
applicable statutory procedures will be entitled to receive a judicial
determination of the fair value of their Shares (exclusive of any element of
value arising from the accomplishment or expectation of the Merger) and to
receive payment of such fair value in cash, together with a fair rate of
interest, if any. Any such judicial determination of the fair value of Shares
could be based upon factors other than, or in addition to, the price per Share
to be paid in the Merger or the market value of the Shares. The value so
determined could be more or less than the price per Share to be paid in the
Merger.
 
  The foregoing summary of Section 262 does not purport to be complete and is
qualified in its entirety by reference to Section 262. FAILURE TO FOLLOW THE
STEPS REQUIRED BY SECTION 262 OF THE DGCL FOR PERFECTING APPRAISAL RIGHTS MAY
RESULT IN THE LOSS OF SUCH RIGHTS.
 
  Going Private Transactions. The Commission has adopted Rule 13e-3 under the
Exchange Act which is applicable to certain "going private" transactions. The
Offeror does not believe that Rule 13e-3 will be applicable to the Merger
unless the Merger is consummated more than one year after the termination of
the Offer. If applicable, Rule 13e-3 requires, among other things, that
certain financial information concerning the fairness of the Merger and the
consideration offered to minority stockholders in such transaction be filed
with the Commission and disclosed to stockholders prior to the consummation of
the Merger.
 
  Except as otherwise described in this Offer to Purchase, the Offeror and
Parent have no current plans or proposals that would relate to, or result in,
any extraordinary corporate transaction involving the Company, such as a
merger, reorganization or liquidation involving the Company or any of its
subsidiaries, a sale or transfer of a material amount of assets of the Company
or any of its subsidiaries, any change in the Company's capitalization or
dividend policy or any other material change in the Company's business,
corporate structure or personnel.
 
13. THE MERGER AGREEMENT.
 
  The Merger Agreement. The Merger Agreement provides that following the
satisfaction or waiver of the conditions described below under "Conditions to
the Obligations of the Parties to Effect the Merger," the Offeror will be
merged with and into the Company, and each then outstanding Share (other than
Shares owned by the Company, any subsidiary of the Company, Parent, the
Offeror, any other subsidiary of Parent or by stockholders, if any, who are
entitled to and who properly exercise dissenters' rights under Delaware law)
will be converted into the right to receive an amount in cash equal to the
price per Share paid pursuant to the Offer, without interest.
 
  Vote Required To Approve Merger. The DGCL requires, among other things, that
the adoption of any plan of merger or consolidation of the Company must be
approved by the Board of Directors and generally by the
 
                                      23
<PAGE>
 
holders of the Company's outstanding voting securities. The Board of Directors
of the Company has unanimously approved the Offer and the Merger;
consequently, the only additional action of the Company that may be necessary
to effect the Merger is approval by the Company's stockholders if the "short-
form" merger procedure described below is not available. Under the DGCL, the
affirmative vote of holders of a majority of the outstanding Shares (including
any Shares owned by the Offeror) is generally required to approve the Merger.
If the Offeror acquires, through the Offer or otherwise, voting power with
respect to a majority of the outstanding Shares (which would be the case if
the Minimum Condition were satisfied and the Offeror were to accept for
payment Shares tendered pursuant to the Offer), it would have sufficient
voting power to effect the Merger without the vote of any other stockholder of
the Company.
 
  The DGCL also provides that if a parent company owns at least 90% of each
class of stock of a subsidiary, such parent company can effect a short-form
merger with that subsidiary without the action of the other stockholders of
the subsidiary. Accordingly, if, as a result of the Offer or otherwise, the
Offeror owns at least 90% of the outstanding Shares, the Offeror could, and
intends to, effect the Merger without prior notice to, or any action by, any
other stockholder of the Company.
 
  Conditions to the Obligations of the Parties to Effect the Merger. The
Merger Agreement provides that the obligation of the parties to effect the
Merger is subject to the satisfaction of certain conditions, including the
following: (a) if required by applicable law, the Merger Agreement and the
transactions contemplated thereby shall have been approved by the affirmative
vote of the holders of a majority of the Shares; (b) no statute, rule,
regulation, executive order, decree, temporary restraining order, preliminary
or permanent injunction or other order issued by any court of competent
jurisdiction or other federal, state or local government or any court,
tribunal, administrative agency or commission or other governmental or other
regulatory authority or agency, domestic, foreign or supranational (a
"Governmental Entity") or other legal restraint or prohibition preventing the
consummation of the Merger shall be in effect; provided, however, that each of
the Company, the Offeror and Parent shall have used reasonable efforts to
prevent the entry of any such injunction or other order and to appeal as
promptly as possible any injunction or other order that may be entered; (c)
the Offeror shall have previously accepted for payment and paid for Shares
pursuant to the Offer; and (d) the applicable waiting period under the HSR Act
shall have expired or been terminated.
 
  Termination of the Merger Agreement. The Merger Agreement may be terminated
at any time prior to the Effective Time, whether before or after approval of
the terms of the Merger Agreement by the stockholders of the Company:
 
    (1) by mutual written consent of Parent and the Company, by action of
  their respective Boards of Directors;
 
    (2) by Parent or the Company if (i) the Merger shall not have been
  consummated on or before June 30, 1998; provided; however, that neither
  Parent nor the Company may terminate the Merger Agreement under the
  foregoing clause (2)(i) if such party shall have materially breached the
  Agreement or (ii) if any court of competent jurisdiction in the United
  States or other United States Governmental Entity has issued an order,
  decree or ruling or taken any other action restraining, enjoining or
  otherwise prohibiting the Merger and such order, decree, ruling or other
  action shall have become final and nonappealable; provided; however, that
  the party seeking to terminate the Merger Agreement shall have used its
  reasonable best efforts to remove or lift such order, decree, ruling or
  other action;
 
    (3) by the Company if, prior to the consummation of the Offer, any person
  has made a bona fide proposal relating to an Acquisition Proposal (as
  defined below), or has commenced a tender or exchange offer for the Shares,
  and the Board of Directors of the Company concludes, consistent with its
  fiduciary duties and after the receipt of advice from such Delaware counsel
  as may be appointed by the Board of Directors, that such proposal if
  consummated would be a Superior Proposal (as defined below);
 
    (4) by Parent if, prior to the consummation of the Offer, the Board of
  Directors of the Company shall have (i) failed to recommend to the
  stockholders of the Company that they accept the Offer, tender their Shares
  pursuant to the Offer and approve and adopt the Merger Agreement (the
  "Stockholder Acceptance"), (ii) withdrawn or materially modified its
  approval or recommendation of the Merger Agreement, the Offer or the
  Merger, (iii) shall have approved or recommended a Superior Proposal (as
 
                                      24
<PAGE>
 
  defined below), (iv) shall have resolved to effect any of the foregoing or
  (v) shall have otherwise taken steps to impede the Stockholder Acceptance;
 
    (5) by Parent, if prior to the consummation of the Offer, there has been
  a material violation or breach by the Company of any representation,
  warranty, covenant or agreement contained in the Merger Agreement (which
  violation or breach is not cured by the Company, within ten days after
  written notice reasonably describing such breach); or
 
    (6) by the Company, if prior to the consummation of the Offer, there has
  been a material violation or breach by Parent or the Offeror of any
  representation, warranty, covenant or agreement contained in the Merger
  Agreement (which violation or breach is not cured by Parent or the Offeror
  within ten days after written notice reasonably describing such breach;
  provided, however, that the obligation under the Offer and the Merger
  Agreement pursuant to which the Offeror shall, and Parent shall cause the
  Offeror to accept for payment, and pay for, all shares validly tendered and
  not withdrawn pursuant to the Offer that the Offeror becomes obligated to
  accept for payment, and pay for, pursuant to the Offer promptly (and in no
  event later than five days) after the expiration of the Offer, shall have
  no cure period).
 
  Acquisition Proposals. The Merger Agreement provides that, from the date
thereof until such time as Parent's designees shall constitute a majority of
the members of the Board of Directors of the Company, the Company shall not,
and shall not permit any of its subsidiaries, or any of its or their officers,
directors, employees, representatives, agents or affiliates (including,
without limitation, any investment banker, attorney or accountant retained by
the Company or any of its subsidiaries) to, directly or indirectly, solicit or
initiate any discussions or negotiations with any corporation, partnership,
person or other entity or group (each, a "Person"), concerning any offer or
proposal which constitutes or is reasonably likely to lead to any Acquisition
Proposal as defined below. Information may be provided in response to a bona
fide inquiry subject to the confidentiality agreement referred to below, and
negotiations may be conducted in response to such inquiry. Upon having
received a bona fide proposal that the Board of Directors of the Company,
consistent with its fiduciary duties and after the receipt of advice from such
Delaware counsel as may be appointed by the Board of Directors concludes if
consummated would be a Superior Proposal, the Board of Directors of the
Company may withdraw or modify its approval or recommendation of the Offer,
the Merger Agreement or the Merger, approve or recommend the Superior Proposal
or terminate the Merger Agreement pursuant to clause 3 under "Termination of
the Merger Agreement" above and shall promptly notify Parent in writing of any
such determination. For five (5) business days after Parent has been informed
of the above conclusion with respect to such Superior Proposal, Parent shall
have the right to match (the "Counterproposal") the economic value of any such
Superior Proposal. The Company shall negotiate in good faith with respect to
such Counterproposal. Any information furnished to any Person in connection
with an Acquisition Proposal shall be provided pursuant to a confidentiality
agreement in customary form on terms not more favorable to such Person than
the terms contained in the confidentiality agreement, dated as of November 5,
1997, between Parent and the Company. Subject to all of the foregoing
requirements, the Company will immediately notify Parent orally and in writing
if any discussions or negotiations are sought to be initiated, any inquiry or
proposal is made, or any information is requested by any Person with respect
to any Acquisition Proposal or which could lead to an Acquisition Proposal and
immediately notify Parent of all material terms of any proposal which it may
receive in respect of any such Acquisition Proposal, including the identify of
the Person making the Acquisition Proposal or the request for information, if
known, and thereafter shall inform Parent on a timely, ongoing basis of the
status and content of any discussions or negotiations with such a third party,
including immediately reporting any material changes to the terms and
conditions thereof. The Merger Agreement defines "Acquisition Proposal" as any
inquiry, proposal or offer from any person relating to any direct or indirect
acquisition or purchase of 15% or more of any class of equity securities of
the Company or any of its subsidiaries, any tender offer or exchange offer
that if consummated would result in any person beneficially owning 15% or more
of any class of equity securities of the Company or any of its subsidiaries,
any merger, consolidation, business combination, sale of substantially all the
assets, recapitalization, liquidation, dissolution or similar transaction
involving the Company or any of its subsidiaries, other than the transactions
contemplated by the Merger Agreement, or any other transaction the
consummation of which could reasonably be expected to impede, interfere with,
prevent or materially delay the Offer and/or the
 
                                      25
<PAGE>
 
Merger or which would reasonably be expected to dilute materially the benefits
to Parent of the transactions contemplated thereby. For purposes of the Merger
Agreement, "Superior Proposal" means any bona fide written offer made by a
third party that is either fully financed or with respect to which a highly
confident and/or a commitment letter from a financial institution of adequate
sophistication and capitalization has been issued to acquire, directly or
indirectly, for consideration consisting of cash and/or securities, more than
50% of the Shares then outstanding or all or substantially all the assets of
the Company and otherwise on terms which the Board of Directors of the Company
determines (after consultation with a nationally recognized investment bank)
to be economically superior to the transaction contemplated by the Merger
Agreement.
 
  The Merger Agreement provides that nothing contained therein shall prohibit
the Company from taking and disclosing to its stockholders a position
contemplated by Rule 14e-2(a) promulgated under the Exchange Act or from
making any disclosure to the Company's stockholders if, in the good faith
judgment of the Board of Directors of the Company, after consultation with
outside counsel, failure so to disclose would be inconsistent with its
fiduciary duties to the Company's stockholders under applicable law; provided,
however, that neither the Company nor its Board of Directors nor any committee
thereof shall, except as permitted by the Merger Agreement and as described
above, withdraw or modify, or propose to withdraw or modify its position with
respect to the Merger or approve or recommend, or propose to approve or
recommend, an Acquisition Proposal.
 
  Fees and Expenses. The Merger Agreement provides that, in the event that (i)
the Merger Agreement is terminated pursuant to clause 3 or 4 under
"Termination of the Merger Agreement" above, or (ii) any person (other than
Parent or any of its affiliates) shall have consummated an Acquisition
Proposal within twelve months following the termination of the Offer at a
value at or above $12 per share, then the Company shall pay to Parent, in the
case of an event under clause (i) above, promptly upon any such termination,
and, in the case of an event under clause (ii) above, at the time of any such
consummation, a termination fee of $4.5 million (the "Termination Fee");
provided, that in no event shall the aggregate payment by the Company of fees
and expenses as described below and of the Termination Fee under such clause
of the Merger Agreement exceed $6.0 million.
 
  The Merger Agreement also provides that, in addition to any other amounts
which may be payable or become payable pursuant to the above paragraph, in the
event that the Merger Agreement is terminated for any reason other than a
material breach by Parent or the Offeror, the Company shall promptly reimburse
Parent or the Offeror, as the case may be, upon receipt of reasonably
satisfactory supporting documentation, for all out-of-pocket expenses and fees
(including, without limitation, fees and expenses payable to all Governmental
Entities, banks, investment banking firms and other financial institutions,
and their respective agents and counsel, and all fees and expenses of counsel,
accountants, financial printers, proxy solicitors, exchange agents, experts
and consultants to Parent and its affiliates), whether incurred prior to, on
or after the date thereof, in connection with the Merger and the consummation
of all transactions contemplated by the Merger Agreement, and the financing
thereof up to a maximum of $2.5 million. Except as otherwise specifically
provided for in the Merger Agreement, whether or not the Merger is
consummated, all costs and expenses incurred in connection with the Merger
Agreement and the transactions contemplated by the Merger Agreement shall be
paid by the party incurring such expenses.
 
  The Merger Agreement provides that the prevailing party in any legal action
undertaken to enforce the Merger Agreement or any provision thereof shall be
entitled to recover from the other party the costs and expenses (including
attorneys' and expert witness fees and expenses) incurred in connection with
such action.
 
  Conduct of Business by the Company. The Merger Agreement provides that,
except as contemplated by the Merger Agreement or as expressly agreed to in
writing by Parent, during the period from the date of the Merger Agreement
until such time as Parent's designees shall constitute a majority of the
members of the Board of Directors of the Company, the Company will, and will
cause each of its subsidiaries to, conduct its operations according to its
ordinary and usual course of business and consistent with past practice and,
subject to its obligations under clause (d) under "--Options; Warrants" below,
use its and their respective reasonable best efforts to preserve intact their
current business organizations, keep available the services of their current
officers and employees and preserve their relationships with customers,
suppliers, licensors, licensees, advertisers,
 
                                      26
<PAGE>
 
distributors and others having business dealings with them and to preserve
goodwill. Without limiting the generality of the foregoing, and except as (x)
otherwise expressly provided in the Merger Agreement, (y) required by law, or
(z) set forth on Schedule 6.01 to the Merger Agreement, the Company will not,
and will cause its subsidiaries not to, without the consent of Parent, which
shall not be unreasonably withheld: (i) except with respect to annual bonuses
made in the ordinary course of business consistent with past practice, adopt
or amend in any material respect any bonus, profit sharing, compensation,
severance, termination, stock option, stock appreciation right, pension,
retirement, employment or other employee benefit agreement, trust, plan or
other arrangement for the benefit or welfare of any director, officer or
employee of the Company or any of its subsidiaries or increase in any manner
the compensation or fringe benefits of any director, officer or employee of
the Company or any of its subsidiaries (except, in each case, for normal
annual salary increases and cost of living increases for the benefit of
officers and employees of the Company with positions below the level of vice
president) or pay any benefit not required by any existing agreement or place
any assets in any trust for the benefit of any director, officer or employee
of the Company or any of its subsidiaries (in each case, except with respect
to employees and directors in the ordinary course of business consistent with
past practice); (ii) incur any indebtedness for borrowed money in excess of
$500,000, other than in consultation with Parent; (iii) expend funds for
individual capital expenditures in excess of $50,000 or $2,000,000 in the
aggregate for any 12-month period (to be apportioned pro-rata over any period
less than 12 months), other than in consultation with Parent; (iv) sell,
lease, license, mortgage or otherwise encumber or subject to any lien or
otherwise dispose of any of its properties or assets other than immaterial
properties or assets (or immaterial portions of properties or assets), except
in the ordinary course of business consistent with past practice; (v) (1)
declare, set aside or pay any dividends on, or make any other distributions in
respect of, any of its capital stock, (2) split, combine or reclassify any of
its capital stock or issue or authorize the issuance of any other securities
in respect of, in lieu of or in substitution for shares of its capital stock
or (3) purchase, redeem or otherwise acquire any shares of capital stock of
the Company or any of its subsidiaries or any other securities thereof or any
rights, warrants or options to acquire any such shares or other securities;
(vi) other than in connection with options and warrants outstanding as of the
date hereof, authorize for issuance, issue, deliver, sell or agree or commit
to issue, sell or deliver (whether through the issuance or granting of
options, warrants, commitments, subscriptions, rights to purchase or
otherwise), pledge or otherwise encumber any shares of its capital stock or
the capital stock of any of its subsidiaries, any other voting securities or
any securities convertible into, or any rights, warrants or options to
acquire, any such shares, voting securities or convertible securities or any
other securities or equity equivalents (including without limitation stock
appreciation rights) other than issuances upon exercise of Options or Warrants
(as defined herein); (vii) amend its Certificate of Incorporation, By-Laws or
equivalent organizational documents or alter through merger, liquidation,
reorganization, restructuring or in any other fashion the corporate structure
or ownership of any material subsidiary of the Company; (viii) make or agree
to make any acquisition of assets which is material to the Company and its
subsidiaries, taken as a whole, except for (1) purchases of inventory in the
ordinary course of business, (2) pursuant to purchase orders entered into in
the ordinary course of business which do not call for payments in excess of
$50,000 per annum or (3) project-related expenditures which, individually, do
not exceed $250,000; or (ix) settle or compromise any shareholder derivative
suits arising out of the transactions contemplated hereby or any other
litigation (whether or not commenced prior to the date of the Merger
Agreement) or settle, pay or compromise any claims not required to be paid.
 
  Board of Directors. The Merger Agreement provides that promptly upon the
acceptance for payment of, and payment for, 50.1% of the Shares by the Offeror
pursuant to the Offer, the Offeror shall be entitled to designate, subject to
compliance with Section 14(f) of the Exchange Act, a majority of the directors
on the Company's Board of Directors, and the Company shall, at such time, take
all such action needed to cause the Offeror's designees to be so elected by
its existing Board of Directors. Subject to applicable law, the Company has
agreed to take all action requested by Parent necessary to effect any such
election, including mailing to its stockholders the Information Statement
containing the information required by Section 14(f) of the Exchange Act and
Rule 14f-1 promulgated thereunder.
 
  Options; Warrants. The Merger Agreement provides that (a) the Company shall
amend its (i) ATC Group Services Inc. 1988 Incentive and Non-Statutory Stock
Option Plan, ATC Group Services Inc. 1993 Incentive
 
                                      27
<PAGE>
 
and Non-Statutory Stock Option Plan, ATC Group Services Inc. 1995 Nonqualified
Stock Option Plan, and any other program pursuant to which there are holders
of Options to purchase Shares granted by the Company (collectively, the "Stock
Option Plans") to provide that all outstanding, unexercised Options shall be
immediately exercisable and that if the optionees do not exercise their
unexercised Options, each optionee shall receive, in settlement of each Option
held by such optionee, a "cash amount" (less any applicable withholding taxes)
with respect to the number of previously unexercised Shares underlying the
Option immediately prior to the effectiveness of the Merger. The Company shall
use its commercially reasonable efforts to amend the Stock Option Plans to
provide that each Option shall terminate as of the effectiveness of the
Merger. The cash amount payable for each Option shall equal the product of (i)
the Merger Consideration minus the exercise price per Share of each such
Option and (ii) the number of previously unexercised Shares covered by each
such option; (b) except as may be otherwise agreed to by Parent or the Offeror
and the Company, the Company's Stock Option Plans shall terminate as of the
effectiveness of the Merger and the provisions in any other plan, program or
arrangement providing for the issuance or grant of any other interest in
respect of the capital stock of the Company or any of its Subsidiaries shall
be deleted as of the effectiveness of the Merger; and (c) the Company shall
use its commercially reasonable efforts so that following the effectiveness of
the Merger no holder of Options will have any right to receive Shares upon
exercise of an Option.
 
  Pursuant to the terms of (i) the Warrant Agreement, dated October 15, 1990,
relating to 568,207 Class C Redeemable Common Stock Purchase Warrants, (ii)
warrant agreements relating to 490,500 warrants issued pursuant to the merger
between the Company and Aurora Environmental Inc. and (iii) the Consulting
Agreement, dated March 14, 1997, relating to 35,000 warrants issued to First
Montauk Securities Corp., the Company has issued Warrants (collectively, the
"Warrants") to certain persons. The holders of the Warrants shall be entitled
either to exercise their Warrants for Shares in accordance with the applicable
agreement under which such Warrants were issued and tender such Shares in the
Offer or upon execution and delivery to the Company of a cancellation
agreement in form and substance reasonably satisfactory to the Company, to
receive from the Company at the Effective Time a cash amount equal to the
product of (i) the Merger Consideration minus the exercise price per share of
each such Warrant and (ii) the number of unexercised Shares covered by each
such Warrant.
 
  The Merger Agreement, however, provides that, notwithstanding anything to
the contrary in clauses (a) through (d), if it is determined that compliance
with any of the actions described in such clauses would cause any individual
subject to Section 16 of the Exchange Act to become subject to the profit
recovery provisions thereof, any Options or Warrants held by such individual
will be canceled or purchased, as the case may be, at the Effective Time or at
such later time as may be necessary to avoid application of such profit
recovery provisions and such individual will be entitled to receive from the
Company or the Surviving Corporation an amount equal to the excess, if any, of
the Merger Consideration over the per Share exercise price of such Option or
Warrant multiplied by the number of Shares subject thereto, and the parties to
the Merger Agreement will cooperate so as to achieve the intent of the
foregoing without giving rise to such profit recovery.
 
  Indemnification and Insurance. In the Merger Agreement, Parent and the
Offeror have agreed that all rights to indemnification for acts or omissions
occurring prior to the effectiveness of the Merger that are in existence as of
the date of the Merger Agreement in favor of the current or former directors,
officers, employees, fiduciaries or agents (the "Indemnified Parties") of the
Company and its subsidiaries as provided in their respective certificates of
incorporation or by-laws or contractual arrangements shall survive the Merger
and shall continue in full force and effect in accordance with their terms. In
the Merger Agreement, Parent and Offeror have agreed that the Company shall,
and from and after the Effective Time, the Surviving Corporation and Parent
shall, indemnify, defend and hold harmless the Indemnified Parties against all
losses, claims, damages, costs, expenses (including attorneys' fees and
expenses), liabilities or judgments, fines or amounts that are paid in
settlement in connection with any pending, threatened or actual claim, action,
suit, proceeding or investigation based in whole or in part or arising in
whole or part out of the fact that such person is or was a director, officer,
employee or agent of the Company or any of its subsidiaries or is or was
serving at the request of the Company as a director, officer, employee or
agent of another corporation, partnership, joint venture, employee benefit
plan,
 
                                      28
<PAGE>
 
trust or other enterprise or by reason of anything done or not done by such
person in any such capacity whether pertaining to any matter existing or
occurring at or prior to the Effective Time or any acts or omissions occurring
or existing at or prior to the Effective Time and whether asserted or claimed
prior to, or at or after, the Effective Time ("Indemnified Liabilities"),
including all Indemnified Liabilities based in whole or in part on, or arising
in whole or in part out of, or pertaining to the Merger Agreement or the
transactions contemplated thereby, in each case to the fullest extent
permitted by applicable law (and the Company, the Surviving Corporation, and
Parent, as the case may be, shall pay expenses in advance of the final
disposition of any such action or proceeding to each Indemnified Party to the
fullest extent permitted by applicable law). The Merger Agreement provides
that in determining whether an Indemnified Party is entitled to
indemnification, if requested by such Indemnified Party such determination
shall be made by special, independent counsel selected by the Surviving
Corporation and Parent and reasonably approved by the Indemnified Party, and
who has not otherwise performed services for the Surviving Corporation, Parent
or their respective affiliates within the last three years. Without limiting
the foregoing, in the event any such claim, action, suit, proceeding or
investigation is brought against any Indemnified Parties (whether arising
before or after the Effective Time), (i) the Indemnified Parties may retain
Squadron, Ellenoff, Plesent & Sheinfeld, LLP or other counsel reasonably
satisfactory to the Company (or the Surviving Corporation after the Effective
Time), and the Company (or, after the Effective Time, the Surviving
Corporation and Parent) shall pay all reasonable fees and expenses of such
counsel for the Indemnified Parties as promptly as statements therefor are
received; and (ii) the Company (or, after the Effective Time, the Surviving
Corporation and Parent) will use all reasonable best efforts to assist in the
vigorous defense of any such matter; provided, that none of the Company, the
Surviving Corporation or Parent shall be liable for any settlement effected
without its prior written consent, which consent shall not be unreasonably
withheld. Any Indemnified Party wishing to claim indemnification under the
relevant provisions of the Merger Agreement, upon learning of any such claim,
action, suit, proceeding or investigation, shall notify the Company (or, after
the Effective Time, the Surviving Corporation and Parent) (but the failure so
to notify shall not relieve a party from any liability which it may have under
such provisions except to the extent such failure prejudices such party's
position with respect to such claims) and shall deliver to the Company (or,
after the Effective Time, the Surviving Corporation and Parent) the
undertaking contemplated by Section 145(e) of the DGCL, but without any
requirement for the posting of the bond. The Indemnified Parties as a group
may retain one law firm (plus local counsel, if necessary) to represent them
with respect to each such matter unless the use of the counsel chosen to
represent the Indemnified Parties would present such counsel with a conflict
of interest, or the representation of all of the Indemnified Parties by the
same counsel would be inappropriate due to actual or potential differing
interests between them, in which case such additional counsel as may be
required (as shall be reasonably determined by the Indemnified Parties and the
Company, the Surviving Corporation or Parent, as the case may be) and
satisfactory to the Company, the Surviving Corporation or Parent, as the case
may be, may be retained by the Indemnified Parties at the cost and expense of
the Company, the Surviving Corporation or Parent, as the case may be. The
Merger Agreement provides that the Company and the Offeror agree that the
foregoing rights to indemnification, (including provisions relating to
advances of expenses) incurred in defense of any action or suit existing in
favor of the Indemnified Parties with respect to matters occurring through the
Effective Time, shall survive the Merger and shall continue in full force and
effect for a period of not less than six years after the Effective Time;
provided, however that all rights to indemnification, including rights
relating to advances of expenses, in respect of any Indemnified Liabilities
asserted or made within such period shall continue until the disposition of
such Indemnified Liabilities. Furthermore, the Merger Agreement provides that
the provisions with respect to indemnification set forth in the Certificate of
Incorporation or Bylaws of the Surviving Corporation shall not be amended for
a period of six years following the Effective Time to the extent that such
amendment would adversely affect the rights thereunder of individuals who at
any time prior to the Effective Time were directors, officers, employees or
agents of the Company in respect of actions or omissions occurring at or prior
to the Effective Time.
 
  Pursuant to the Merger Agreement, the Company (or, after the Effective Time,
the Surviving Corporation and Parent) shall indemnify any Indemnified Party
against all reasonable costs and expenses (including attorneys' fees and
expenses), such amounts to be payable in advance upon request as provided in
the Merger Agreement relating to the enforcement of such Indemnified Party's
rights under the Merger Agreement or under the
 
                                      29
<PAGE>
 
documents referred to above, but only to the extent that such Indemnified
Party is ultimately determined to be entitled to indemnification under the
Merger Agreement and other documents referred to above. Any amounts due
pursuant to the preceding sentence shall be payable upon request by the
Indemnified Party.
 
  Pursuant to the Merger Agreement, Parent will, for a period of six years
from the effectiveness of the Merger, unless Parent agrees in writing to
guarantee the indemnification obligations set forth above, maintain in effect
the Company's current directors' and officers' liability insurance covering
those persons who are currently covered by the Company's directors' and
officers' liability insurance policy except that, to the extent that such
coverage is not obtainable at less than or equal to 225% of the current per
annum cost, Parent will be obligated to purchase only so much coverage as may
then be obtained for such amount.
 
  The Merger Agreement provides that in the event the Company or the Surviving
Corporation or any of their respective successors or assigns (i) consolidates
with or merges into any other person and shall not be the continuing or
surviving corporation of such consolidation or merger, or (ii) transfers all
or substantially all of its properties to any person, then, and in each case,
proper provision shall be made so that the successors and assigns of the
Company and the Surviving Corporation, as the case may be, shall assume the
indemnification obligations set forth in the Merger Agreement.
 
  Representations and Warranties. The Merger Agreement contains various
customary representations and warranties.
 
  Procedure for Termination, Amendment, Extension or Waiver. The Merger
Agreement provides that in the event the Offeror's designees are appointed or
elected to the Board of Directors of the Company as described above under
"Board of Directors", after the acceptance for payment of Shares pursuant to
the Offer and prior to the Effective Time, the affirmative vote of the
directors of the Company not designated by Parent or Offeror is required for
the Company to amend or terminate the Merger Agreement, exercise or waive any
of its rights or remedies under the Merger Agreement, or extend the time for
performance of the Offeror's and Parent's respective obligations under the
Merger Agreement.
 
14. DIVIDENDS AND DISTRIBUTIONS.
 
  Pursuant to the terms of the Merger Agreement, the Company is prohibited
from taking any of the actions described in the two succeeding paragraphs, and
nothing herein shall constitute a waiver by the Offeror or Parent of any of
its rights under the Merger Agreement or a limitation of remedies available to
the Offeror or Parent for any breach of the Merger Agreement, including
termination thereof.
 
  If, on or after November 26, 1997, the Company should (a) split, combine or
otherwise change the Shares or its capitalization, (b) acquire or otherwise
cause a reduction in the number of outstanding Shares or other securities or
(c) issue or sell additional Shares, shares of any other class of capital
stock, other voting securities or any securities convertible into, or rights,
warrants or options, conditional or otherwise, to acquire any of the
foregoing, other than Shares issued pursuant to the exercise of outstanding
Company stock options or warrants, then, subject to the provisions of Section
15, the Offeror, in its sole discretion, may make such adjustments as it deems
appropriate in the Offer Price and other terms of the Offer, including,
without limitation, the number or type of securities offered to be purchased.
 
  If, on or after November 26, 1997, the Company should declare or pay any
cash dividend on the Shares or other distribution on the Shares, or issue with
respect to the Shares any additional Shares, shares of any other class of
capital stock, other voting securities or any securities convertible into, or
rights, warrants or options, conditional or otherwise, to acquire, any of the
foregoing, payable or distributable to stockholders of record on a date prior
to the transfer of the Shares purchased pursuant to the Offer to the Offeror
or its nominee or transferee on the Company's stock transfer records, then,
subject to the provisions of Section 15, (a) the Offer Price may, in the sole
discretion of the Offeror, be reduced by the amount of any such cash dividend
or cash distribution and (b) the whole of any such noncash dividend,
distribution or issuance to be received by the tendering
 
                                      30
<PAGE>
 
stockholders will (i) be received and held by the tendering stockholders for
the account of the Offeror and will be required to be promptly remitted and
transferred by each tendering stockholder to the Depositary for the account of
the Offeror, accompanied by appropriate documentation of transfer, or (ii) at
the direction of the Offeror, be exercised for the benefit of the Offeror, in
which case the proceeds of such exercise will promptly be remitted to the
Offeror. Pending such remittance and subject to applicable law, the Offeror
will be entitled to all rights and privileges as owner of any such noncash
dividend, distribution, issuance or proceeds and may withhold the entire Offer
Price or deduct from the Offer Price the amount or value thereof, as
determined by the Offeror in its sole discretion.
 
15. CERTAIN CONDITIONS OF THE OFFER.
 
  Notwithstanding any other term of the Offer or the Merger Agreement, the
Offeror shall not be required to accept for payment or, subject to any
applicable rules and regulations of the Commission, including Rule 14e-1(c)
under the Exchange Act (relating to the Offeror's obligation to pay for or
return tendered Shares after the termination or withdrawal of the Offer), to
pay for, and may delay the acceptance for payment of or, subject to the
restriction referred to above, the payment for, any Shares tendered pursuant
to the Offer unless (i) the Minimum Condition and the Financing Condition
shall have been satisfied and (ii) any waiting period under the HSR Act
applicable to the purchase of Shares pursuant to the Offer shall have expired
or been terminated. Furthermore, notwithstanding any other term of the Offer
or the Merger Agreement, the Offeror shall not be required to accept for
payment or, subject as aforesaid, to pay for any Shares not theretofore
accepted for payment or paid for, and may terminate the Offer if, at any time
on or after the date of the Merger Agreement and before the acceptance of such
Shares for payment or the payment therefor, any of the following conditions
exists:
 
    (a) there shall be any action or proceeding commenced by any Governmental
  Entity which has a reasonable likelihood of success and which if decided
  adversely to the Company, would have a material adverse effect on the
  Company (i) challenging the acquisition by Parent or the Offeror of any
  Shares under the Offer, seeking to restrain or prohibit the making or
  consummation of the Offer or the Merger or the performance of any of the
  other transactions contemplated by the Merger Agreement, or seeking to
  obtain from the Company, Parent or the Offeror any damages that are
  material in relation to the Company and its subsidiaries taken as a whole,
  (ii) seeking to prohibit or impose any material limitations on Parent's or
  the Offeror's ownership or operation (or that of any of their respective
  Subsidiaries or affiliates) of all or a material portion of the Company's
  businesses or assets, or to compel Parent or the Offeror or their
  respective Subsidiaries and affiliates to dispose of or hold separate any
  material portion of the business or assets of the Company and its
  Subsidiaries taken as a whole, (iii) seeking to impose material limitations
  on the ability of the Offeror, or render the Offeror unable, to accept for
  payment, pay for or purchase some or all of the Shares pursuant to the
  Offer and the Merger, (iv) seeking to impose material limitations on the
  ability of the Offeror or Parent effectively to exercise full rights of
  ownership of the Shares, including, without limitation, the right to vote
  the Shares purchased by it on all matters properly presented to the
  Company's stockholders, or (v) which otherwise is reasonably likely to have
  a material adverse effect on the Company;
 
    (b) there shall be any statute, rule, regulation, judgment, order or
  injunction enacted, entered, enforced, promulgated or deemed applicable to
  the Offer or the Merger, or any other action shall be taken by any
  Governmental Entity or court, other than the application to the Offer or
  the Merger of any applicable waiting period under the HSR Act that is
  reasonably likely to result, directly or indirectly, in any of the
  consequences referred to in clauses (i) through (v) of paragraph (a) above;
 
    (c) there shall have occurred any events after the date of the Merger
  Agreement that, either individually or in the aggregate, have caused or are
  reasonably likely to cause a material adverse change with respect to the
  Company other than a change resulting from the announcement of the Offer or
  the Merger;
 
    (d) (i) the Board of Directors of the Company or any committee thereof
  shall have publicly (including by amendment of its Schedule 14D-9)
  withdrawn or modified in a manner adverse to Parent or the Offeror its
  approval or recommendation of the Offer, the Merger or the Merger
  Agreement, or approved or
 
                                      31
<PAGE>
 
  recommended any Acquisition Proposal, (ii) the Company shall have entered
  into any agreement with respect to any Superior Proposal in accordance with
  the Merger Agreement or (iii) the Board of Directors of the Company or any
  committee thereof shall have resolved to take any of the foregoing actions
  (see "The Merger Agreement--Acquisition Proposals" in Section 13);
 
    (e) any of the representations and warranties of the Company set forth in
  the Merger Agreement shall not be true and correct in any material respect,
  in each case at the date of the Merger Agreement and at the scheduled or
  extended expiration of the Offer except for such breaches that would not
  have, individually or in the aggregate, a material adverse effect on the
  Company;
 
    (f) the Company shall have failed to perform in any material respect any
  material obligation or to comply in any material respect with any material
  agreement or covenant of the Company to be performed or complied with by it
  under the Merger Agreement except for such breaches that would not have,
  individually or in the aggregate, a material adverse effect on the Company;
 
    (g) the Merger Agreement shall have been terminated in accordance with
  its terms;
 
    (h) there shall have occurred (i) any general suspension of, or
  limitation on prices for, trading in securities on the New York Stock
  Exchange or on NASDAQ, (ii) a declaration of a banking moratorium or any
  suspension of payments in respect of banks in the United States, (iii) a
  commencement of a war, armed hostilities or other international or national
  calamity directly involving the armed forces of the United States that
  materially and adversely affects the financial markets in the United
  States, (iv) any material limitation (whether or not mandatory) by any
  governmental authority on the extension of credit by banks or other lending
  institutions, or (v) in the case of any of the foregoing existing at the
  time of the commencement of the Offer, a material acceleration or worsening
  thereof;
 
    (i) the Company shall fail to receive the proceeds of financing pursuant
  to the financing letters set forth on Schedule 5.06 of the Merger Agreement
  or involving such other financing sources, as Parent and the Company shall
  reasonably agree and are not materially more onerous, in amounts sufficient
  to consummate the transactions contemplated by this Agreement, including,
  without limitation (i) to pay, with respect to all Common Stock in the
  Merger, the Offer Price pursuant to the Merger Agreement, (ii) to refinance
  certain outstanding indebtedness of the Company, (iii) to pay any fees and
  expenses in connection with the transactions contemplated by this Agreement
  or the financing thereof and (iv) to provide for the working capital needs
  of the Company following the Merger, including, without limitation, if
  applicable, letters of credit.
 
  The foregoing conditions are for the sole benefit of Parent and the Offeror,
may be asserted by Parent or the Offeror regardless of the circumstances
giving rise to such condition (including any action or inaction by Parent or
the Offeror not in violation of the Merger Agreement) and may be waived by
Parent or the Offeror in whole or in part at any time and from time to time in
the sole discretion of Parent or the Offeror, subject in each case to the
terms of the Agreement. The failure by Parent or the Offeror at any time to
exercise any of the foregoing rights shall not be deemed a waiver of any such
right and each such right shall be deemed an ongoing right which may be
asserted at any time and from time to time.
 
16. CERTAIN LEGAL MATTERS.
 
  On or about November 5, 1997, a summons and complaint were filed in the
Court of Chancery of the State of Delaware in and for New Castle County (the
"Delaware Court") on behalf of Irv Richter, as plaintiff (the "Richter
Complaint"). The Richter Complaint names the Company and the members of the
Company's Board of Directors as defendants. On or about November 12, 1997,
another summons and complaint were filed in the Delaware Court on behalf of
Joseph I. Peters, as plaintiff (the "Peters Complaint" and, together with the
Richter Complaint, the "Complaints"). The Peters Complaint names the Company,
the members of the Company's Board of Directors, Weiss, Peck & Greer LLC and
WPG Fund as defendants. Both complaints challenge the Offer. Both complaints
seek class action status on behalf of the stockholders of the Company and
contain essentially the same allegations that the Offer Price is inadequate
and unfair and that the defendants have breached their fiduciary duties to the
plaintiffs and other stockholders of the Company. The plaintiffs seek among
 
                                      32
<PAGE>
 
other things, to enjoin or set aside the transactions contemplated by the
Offer or compensatory damages. The defendants have received extensions of time
from the plaintiffs to respond to the Complaints. The Company believes the
allegations contained in both Complaints are meritless and intends to defend
both actions vigorously.
 
  Except as set forth in this Section, the Offeror is not aware of any
approval or other action by any governmental or administrative agency which
would be required for the acquisition or ownership of Shares by the Offeror as
contemplated herein. Should any such approval or other action be required, it
will be sought, but the Offeror has no current intention to delay the purchase
of Shares tendered pursuant to the Offer pending the outcome of any such
matter, subject, however, to the Offeror's right to decline to purchase Shares
if any of the conditions specified in Section 15 shall have occurred. There
can be no assurance that any such approval or other action, if needed, would
be obtained or would be obtained without substantial conditions, or that
adverse consequences might not result to the Company's business or that
certain parts of the Company's business might not have to be disposed of if
any such approvals were not obtained or other action taken.
 
  U. S. Antitrust. Under the provisions of the HSR Act applicable to the
Offer, the acquisition of Shares under the Offer may be consummated following
the expiration of a 15-day waiting period following the filing by the WPG Fund
of a Premerger Notification and Report Form with respect to the Offer, unless
the WPG Fund receives a request for additional information or documentary
material from the Department of Justice, Antitrust Division (the "Antitrust
Division") or the Federal Trade Commission (the "FTC") or unless early
termination of the waiting period is granted. The WPG Fund made such a filing
on December 4, 1997 and, accordingly, the initial waiting period will expire
at 11:59 P.M. on December 19, 1997. If, within the initial 15-day waiting
period, either the Antitrust Division or the FTC request additional
information or documentary material concerning the Offer, the waiting period
will be extended through the tenth day after the date of substantial
compliance by all parties receiving such requests. Complying with a request
for additional information or documentary material can take a significant
amount of time.
 
  The Antitrust Division and the FTC frequently scrutinize the legality under
the antitrust laws of transactions such as the Offeror's proposed acquisition
of the Company. At any time before or after the Offeror's acquisition of
Shares pursuant to the Offer, the Antitrust Division or the FTC could take
such action under the antitrust laws as either deems necessary or desirable in
the public interest, including seeking to enjoin the purchase of Shares
pursuant to the Offer or the consummation of the Merger, or seeking the
divestiture of Shares acquired by the Offeror or the divestiture of
substantial assets of the Company or its subsidiaries or Parent or its
subsidiaries. Private parties may also bring legal action under the antitrust
laws under certain circumstances. There can be no assurance that a challenge
to the Offer or to the consummation of the Merger on antitrust grounds will
not be made, or, if such a challenge is made, of the result thereof.
 
  If any applicable waiting period under the HSR Act has not expired or been
terminated prior to the Expiration Date, the Offeror will not be obligated to
proceed with the Offer or the purchase of any Shares not theretofore purchased
pursuant to the Offer. See Section 15.
 
  Section 203 of the DGCL. Section 203 of the DGCL, in general, prohibits a
Delaware corporation such as the Company from engaging in a "Business
Combination" (defined as a variety of transactions, including mergers) with an
"Interested Stockholder" (defined generally as a person that is the beneficial
owner of 15% or more of a corporation's outstanding voting stock) for a period
of three years following the date that such person became an Interested
Stockholder unless, among other things, prior to the date such person became
an Interested Stockholder, the board of directors of the corporation approved
either the Business Combination or the transaction that resulted in the
stockholder becoming an Interested Stockholder. Neither the Offeror nor any of
its affiliates (as such term is defined in Section 203 of the DGCL) became an
Interested Stockholder prior to approval of the transaction by the Board of
Directors of the Company. Therefore, Section 203 of the DGCL is inapplicable
to the Merger.
 
  Other State Takeover Laws. A number of other states have adopted laws and
regulations applicable to attempts to acquire securities of corporations which
are incorporated, or have substantial assets, stockholders,
 
                                      33
<PAGE>
 
principal executive offices or principal places of business, or whose business
operations otherwise have substantial economic effects in such states. In
Edgar v. MITE Corp., in 1982, the Supreme Court of the United States (the
"U.S. Supreme Court") invalidated on constitutional grounds the Illinois
Business Takeover statute, which, as a matter of state securities law, made
takeovers of corporations meeting certain requirements more difficult. However
in 1987, in CTS Corp. v. Dynamics Corp. of America, the U.S. Supreme Court
held that the State of Indiana may, as a matter of corporate law and, in
particular, with respect to those aspects of corporate law concerning
corporate governance, constitutionally disqualify a potential acquirer from
voting on the affairs of a target corporation without the prior approval of
the remaining stockholders. The state law before the U.S. Supreme Court was by
its terms applicable only to corporations that had a substantial number of
stockholders in the state and were incorporated there.
 
  The Company, directly or through subsidiaries, conducts business in a number
of states throughout the United States, some of which have enacted takeover
laws. The Offeror does not know whether any of these laws will, by their
terms, apply to the Offer or the Merger and has not complied with any such
laws. Should any person seek to apply any state takeover law, the Offeror will
take such action as then appears desirable, which may include challenging the
validity or applicability of any such statute in appropriate court
proceedings. In the event it is asserted that one or more state takeover laws
is applicable to the Offer or the Merger, and an appropriate court does not
determine that it is inapplicable or invalid as applied to the Offer, the
Offeror might be required to file certain information with, or receive
approvals from, the relevant state authorities. In addition, if enjoined, the
Offeror might be unable to accept for payment any Shares tendered pursuant to
the Offer, or be delayed in continuing or consummating the Offer and the
Merger. In such case, the Offeror may not be obligated to accept for payment
any Shares tendered. See Section 15.
 
17. FEES AND EXPENSES.
 
  Neither the Offeror nor Parent, nor any officer, director, stockholder,
agent or other representative of the Offeror or Parent, will pay any fees or
commissions to any broker, dealer or other person (other than the Information
Agent and the Depositary) for soliciting tenders of Shares pursuant to the
Offer. Brokers, dealers, commercial banks and trust companies and other
nominees will, upon request, be reimbursed by the Offeror for customary
mailing and handling expenses incurred by them in forwarding materials to
their customers.
 
  BTAB is acting as Dealer Manager in connection with the Offer and has
provided certain financial advisory services to Parent and the Offeror in
connection with the proposed acquisition of the Shares. BTAB will not receive
a fee for its services as Dealer Manager in connection with the Offer. Parent
and the WPG Fund have jointly and severally agreed to reimburse BTAB for its
out-of-pocket expenses related to its engagement, including the fees and
expenses of its counsel, and have jointly and severally agreed to indemnify
BTAB against certain liabilities and expenses, including under the federal
securities laws.
 
  The Offeror has retained MacKenzie Partners, Inc. as Information Agent, and
Bankers Trust Company, as Depositary, in connection with the Offer. The
Information Agent and the Depositary will receive reasonable and customary
compensation for their services hereunder and reimbursement for their
reasonable out-of-pocket expenses. The Information Agent and the Depositary
will also be indemnified by the Offeror against certain liabilities in
connection with the Offer. The Information Agent may contact holders of Shares
by mail, telex, telegraph and personal interviews and may request brokers,
dealers and other nominee stockholders to forward materials relating to the
Offer to beneficial owners of Shares.
 
18. MISCELLANEOUS.
 
  The Offer is not being made to, nor will tenders be accepted from or on
behalf of, holders of Shares residing in any jurisdiction in which the making
or acceptance thereof would not be in compliance with the securities, blue sky
or other laws of such jurisdiction. In any jurisdiction where the securities,
blue sky or other laws require the Offer to be made by a licensed broker or
dealer, the Offer shall be deemed to be made on behalf of the
 
                                      34
<PAGE>
 
Offeror by the Dealer Manager or one or more registered brokers or dealers
licensed under the laws of such jurisdiction.
 
  No person has been authorized to give any information or make any
representation on behalf of the Offeror other than as contained in this Offer
to Purchase or in the Letter of Transmittal and, if any such information or
representation is given or made, it should not be relied upon as having been
authorized by the Offeror or Parent.
 
  The Offeror and Parent have filed with the Commission a Schedule 14D-1,
pursuant to Section 14(d)(1) of the Exchange Act and Rule 14d-3 promulgated
thereunder, furnishing certain information with respect to the Offer. Such
Schedule 14D-1 and any amendments thereto, including exhibits, may be examined
and copies may be obtained at the same places and in the same manner as set
forth with respect to the Company in Section 8 (except that they will not be
available at the regional offices of the Commission).
 
                                          Acquisition Corp.
 
December 4, 1997
 
                                       35
<PAGE>
 
                                                                        ANNEX I
 
  CERTAIN INFORMATION CONCERNING THE MANAGING MEMBERS OF WPG PARTNERS II, THE
   GENERAL PARTNERS OF THE WPG OVERSEAS FUND AND THE DIRECTORS AND EXECUTIVE
                      OFFICERS OF PARENT AND THE OFFEROR
 
  1. MANAGING MEMBERS OF WPG PARTNERS II. Set forth below are the name,
current business address, citizenship, present principal occupation or
employment and five-year employment history of each managing member of WPG
Partners II. Each person was designated in April 1997. Each person named below
is a citizen of the United States of America. Each persons' business address
is c/o Weiss Peck & Greer, L.L.C., One New York Plaza, New York, New York,
10004.
 
<TABLE>
<CAPTION>
                             PRINCIPAL OCCUPATION OR EMPLOYMENT DURING PAST FIVE YEARS,
  NAME                   AGE    POSITIONS WITH THE OFFEROR AND CERTAIN DIRECTORSHIPS
  ----                   --- ----------------------------------------------------------
<S>                      <C> <C>
Steven N. Hutchinson....  48      Managing Member. Steven N. Hutchinson has been a
                                  principal of WPG, an investment management
                                  company that sponsors the WPG Fund and the WPG
                                  Overseas Fund, since 1993. Prior to that time,
                                  Mr. Hutchinson served in numerous positions,
                                  including vice president and director, at The
                                  Hillman Company, a privately-owned investment
                                  firm. Mr. Hutchinson serves as a director of
                                  Centennial Resources, Inc., CoreSource, Inc. and
                                  Michael Alan Designs.
Wesley W. Lang..........  40      Managing Member. Wesley W. Lang has been a
                                  principal of WPG since 1985. Prior to joining
                                  WPG, Mr. Lang was employed by Manufacturers
                                  Hanover Trust Company, where he specialized in
                                  acquisition financing. He serves as a director
                                  of Chyron Corporation, Color Associates, Inc.,
                                  Dollar Financial Group, Meridian Aggregates
                                  Company, Powell Plant Farms, Inc. and Tire
                                  Kingdom, Inc.
</TABLE>
 
  2. MANAGING MEMBERS OF WPG PARTNERS II (OVERSEAS). Unless otherwise
indicated, for each person identified below all information concerning the
citizenship, current business address, present principal occupation or
employment and five-year employment history of such person is the same as the
information given above. Each person was designated in April 1997.
 
<TABLE>
<CAPTION>
                             PRINCIPAL OCCUPATION OR EMPLOYMENT DURING PAST FIVE YEARS,
  NAME                   AGE    POSITIONS WITH THE OFFEROR AND CERTAIN DIRECTORSHIPS
  ----                   --- ----------------------------------------------------------
<S>                      <C> <C>
Steven N. Hutchinson....  48      Managing Member.
Wesley W. Lang..........  40      Managing Member.
</TABLE>
 
  3. DIRECTORS AND EXECUTIVE OFFICERS OF WPG CDA V (OVERSEAS). Unless
otherwise indicated, for each person identified below all information
concerning citizenship, current business address, present principal occupation
or employment and five-year employment history of such person is the same as
the information given above. Each person was elected in April 1997.
 
                                      A-1
<PAGE>
 
<TABLE>
<CAPTION>
                             PRINCIPAL OCCUPATION OR EMPLOYMENT DURING PAST FIVE YEARS,
  NAME                   AGE    POSITIONS WITH THE OFFEROR AND CERTAIN DIRECTORSHIPS
  ----                   --- ----------------------------------------------------------
<S>                      <C> <C>
Patrick Keating.........  30      Director. Patrick Keating has been employed
 BankAmerica Trust and            since April 1995 as a Trust Officer at
 Banking Corporation              BankAmerica Trust and Banking Corporation
 (Cayman) Limited, Box            (Cayman) Limited ("BankAmerica). BankAmerica is
 192, Grand Cayman                a Cayman Islands corporation which provides
 Island, British West             trust and administration services to WPG CDA V
 Indies                           (Overseas) pursuant to a contract. Prior to
                                  joining BankAmerica, Mr. Keating was an
                                  Accountant at Irish Life Assurance PLC from June
                                  1994 to April 1995 and a Senior Auditor at
                                  Coopers & Lybrand in Ireland from October 1990
                                  to May 1994. Mr. Keating is a citizen of
                                  Ireland.
Philip Greer............  61      Director. Philip Greer co-founded WPG in 1970
 c/o Weiss, Peck &                and is currently its Senior Managing Principal.
 Greer, L.L.C., One New           He currently serves as a director of Federal
 York Plaza, New York,            Express Corporation, Network Computing Devices,
 New York 10004                   Robert Mondavi Corporation, Precept Software,
                                  Inc. and Newstar Inc. Mr. Greer is a citizen of
                                  the United States of America.
Wesley W. Lang..........  40      President.
Steven N. Hutchinson....  48      Secretary.
</TABLE>
 
  4. DIRECTORS AND EXECUTIVE OFFICERS OF PARENT. Unless otherwise indicated,
for each person identified below all information concerning the citizenship,
current business address, present principal occupation or employment and five-
year employment history for such person is the same as the information given
above. Each person was elected in October 1997.
 
<TABLE>
<CAPTION>
                             PRINCIPAL OCCUPATION OR EMPLOYMENT DURING PAST FIVE YEARS,
  NAME                   AGE    POSITIONS WITH THE OFFEROR AND CERTAIN DIRECTORSHIPS
  ----                   --- ----------------------------------------------------------
<S>                      <C> <C>
Steven N. Hutchinson....  48      Director and President.
Nora E. Kerppola........  32      Director and Secretary. Nora E. Kerppola has
                                  been a principal of WPG Private Equity Partners
                                  II, L.P., an affiliate of WPG Partners II, since
                                  January 1994. Prior to that time, Ms. Kerppola
                                  was employed as a private equity investor at
                                  Investor International (U.S.), a subsidiary of
                                  Sweden's Wallenberg Group since January 1990.
                                  Prior to that time, Ms. Kerppola was an
                                  associate in the Investment Banking Department
                                  of Credit Suisse First Boston Corporation. Ms.
                                  Kerppola serves as a director of Dollar
                                  Financial Group and Powell Plan Farms, Inc. Ms.
                                  Kerppola is a citizen of Finland.
Tania R. Cochran........  25      Director and Treasurer. Tania R. Cochran has
                                  been an associate at Weiss, Peck & Greer, L.L.C.
                                  since August 1997. Prior to that time, Ms.
                                  Cochran was employed as an analyst at J.P.
                                  Morgan & Co., Inc. since July 1994. Ms. Cochran
                                  is a citizen of the United States of America.
</TABLE>
 
  5. DIRECTORS AND EXECUTIVE OFFICERS OF THE OFFEROR. Unless otherwise
indicated, for each person identified below all information concerning the
age, citizenship, current business address, present principal occupation or
employment and five-year employment history for such person is the same as the
information given above. Each person was elected in October 1997.
 
<TABLE>
<CAPTION>
                             PRINCIPAL OCCUPATION OR EMPLOYMENT DURING PAST FIVE YEARS,
  NAME                   AGE    POSITIONS WITH THE OFFEROR AND CERTAIN DIRECTORSHIPS
  ----                   --- ----------------------------------------------------------
<S>                      <C> <C>
Steven N. Hutchinson....  48      Director and President.
Nora E. Kerppola........  32      Director and Secretary.
Tania R. Cochran........  25      Director and Treasurer
</TABLE>
 
                                      A-2
<PAGE>
 
  Facsimile copies of the Letter of Transmittal will be accepted. The Letter of
Transmittal and certificates for Shares and any other required documents should
be sent or delivered by each stockholder of the Company or his broker, dealer,
commercial bank, trust company or other nominee to the Depositary at one of the
addresses set forth below:
 
                        The Depositary for the Offer is:
 
                             BANKERS TRUST COMPANY
 
        By Mail:              By Overnight or                By Hand:
                                  Courier:
 
 BT Services Tennessee,    BT Services Tennessee,     Bankers Trust Company
          Inc.                      Inc.                Corporate Trust &
  Reorganization Unit        Corporate Trust &             Agency Group
    P.O. Box 292737             Agency Group           Attn: Reorganization
  Nashville, Tennessee      Reorganization Unit             Department
       37229-2737         648 Grassmere Park Road       Receipt & Delivery
                            Nashville, Tennessee              Window
                                   37211              123 Washington Street,
                                                            1st Floor
                                                        New York, New York
                                                              10006
 
 Facsimile Transmission    Confirm by Telephone:           Information:
        Number:                (615) 835-3572             (800) 735-7777
     (615) 835-3701
 
  Any questions or requests for assistance or additional copies of the Offer to
Purchase and the Letter of Transmittal and Notice of Guaranteed Delivery may be
directed to the Information Agent or the Dealer Manager at their respective
telephone numbers and locations listed below. Stockholders may also contact
their broker, dealer, commercial bank, trust company or other nominee for
assistance concerning the Offer.
 
                      The Dealer Manager for the Offer is:
 
                          BT ALEX. BROWN INCORPORATED
                         130 LIBERTY STREET, 30TH FLOOR
                            NEW YORK, NEW YORK 10006
                         (212) 250-2500 (CALL COLLECT)
 
                    The Information Agent for the Offer is:
 
 
 
                                    [LOGO]
                                   MACKENZIE
                                PARTNERS, INC.

                                156 FIFTH AVENUE
                            NEW YORK, NEW YORK 10010
                         (212) 929-5500 (CALL COLLECT)
                           (800) 322-2885 (TOLL-FREE)

<PAGE>
 
                                                                 EXHIBIT (a)(2)
                             LETTER OF TRANSMITTAL
                       TO TENDER SHARES OF COMMON STOCK
                                      OF
                            ATC GROUP SERVICES INC.
 
                       PURSUANT TO THE OFFER TO PURCHASE
                            DATED DECEMBER 4, 1997
                                      BY
                               ACQUISITION CORP.
                           AN INDIRECT SUBSIDIARY OF
                 WPG CORPORATE DEVELOPMENT ASSOCIATES V, L.P.
 
 THE OFFER AND WITHDRAWAL RIGHTS WILL EXPIRE AT 12:00 MIDNIGHT, NEW YORK CITY
           TIME, ON JANUARY 21, 1998, UNLESS THE OFFER IS EXTENDED.
 
 
                                The Depositary:
 
                             BANKERS TRUST COMPANY
 
         By Mail:          By Overnight or Courier:           By Hand:
 
 
 
  BT Services Tennessee,  BT Services Tennessee, Inc.  Bankers Trust Company
           Inc.         Corporate Trust & Agency GroupCorporate Trust & Agency
   Reorganization Unit        Reorganization Unit              Group
     P.O. Box 292737        648 Grassmere Park Road     Attn: Reorganization
   Nashville, Tennessee   Nashville, Tennessee 37211         Department
        37229-2737                                   Receipt & Delivery Window
                                                       123 Washington Street,
                                                             1st Floor
                                                      New York, New York 10006
 
  Facsimile Transmission     Confirm by Telephone:          Information:
         Number:                (615) 835-3572             (800) 735-7777
      (615) 835-3701
 
                               ---------------
 
  DELIVERY OF THIS LETTER OF TRANSMITTAL TO AN ADDRESS OTHER THAN AS SET FORTH
ABOVE WILL NOT CONSTITUTE A VALID DELIVERY. YOU MUST SIGN THIS LETTER OF
TRANSMITTAL IN THE APPROPRIATE SPACE THEREFOR PROVIDED BELOW AND COMPLETE THE
SUBSTITUTE FORM W-9 SET FORTH BELOW.
 
  THE INSTRUCTIONS ACCOMPANYING THIS LETTER OF TRANSMITTAL SHOULD BE READ
CAREFULLY BEFORE THIS LETTER OF TRANSMITTAL IS COMPLETED.
 
                        DESCRIPTION OF SHARES TENDERED
- -------------------------------------------------------------------------------
<TABLE>
<CAPTION>
NAME(S) AND ADDRESSES OF REGISTERED HOLDER(S)                     SHARES TENDERED
         (PLEASE FILL IN, IF BLANK)                   (ATTACH ADDITIONAL LIST, IF NECESSARY)
- ------------------------------------------------------------------------------------------------
                                                                     NUMBER OF
                                                     SHARE            SHARES           NUMBER OF
                                                  CERTIFICATE     REPRESENTED BY        SHARES
                                                  NUMBER(S)*      CERTIFICATE(S)*     TENDERED**
                                     -----------------------------------------------------------
                                     -----------------------------------------------------------
                                     -----------------------------------------------------------
                                     -----------------------------------------------------------
                                     -----------------------------------------------------------
                                     -----------------------------------------------------------
<S>                                            <C>               <C>               <C>
                                                 TOTAL SHARES
</TABLE>
- -------------------------------------------------------------------------------
  * Need not be completed by stockholders tendering by book-entry transfer.
 ** Unless otherwise indicated, it will be assumed that all Shares
    represented by any certificates delivered to the Depositary are being
    tendered. See Instruction 4.
<PAGE>
 
  This Letter of Transmittal is to be completed by stockholders of ATC Group
Services Inc. if certificates are to be forwarded herewith or, unless an
Agent's Message (as defined in the Offer to Purchase) is utilized, if delivery
of Shares (as defined below) is to be made by book-entry transfer to the
Depositary's account at The Depository Trust Company or the Philadelphia
Depository Trust Company (hereinafter collectively referred to as the "Book-
Entry Transfer Facilities") pursuant to the procedures set forth in Section 2
of the Offer to Purchase. Delivery of documents to a Book-Entry Transfer
Facility does not constitute delivery to the Depositary.
 
  Stockholders whose certificates for Shares are not immediately available or
who cannot deliver their Shares and all other documents required hereby to the
Depositary by the Expiration Date (as defined in the Offer to Purchase), or
who cannot comply with the book-entry transfer procedures on a timely basis,
may nevertheless tender their Shares pursuant to the guaranteed delivery
procedures set forth in Section 2 of the Offer to Purchase. See Instruction 2.
 
                   NOTE: SIGNATURES MUST BE PROVIDED BELOW.
             PLEASE READ THE ACCOMPANYING INSTRUCTIONS CAREFULLY.
 
[_]CHECK HERE IF TENDERED SHARES ARE BEING DELIVERED BY BOOK-ENTRY TRANSFER TO
   THE DEPOSITARY'S ACCOUNT AT ONE OF THE BOOK-ENTRY TRANSFER FACILITIES AND
   COMPLETE THE FOLLOWING:
 
  Name of Tendering Institution ______________________________________________
 
  Account No. _____________________________________________________________ at
 
  [_] The Depository Trust Company
 
  [_] Philadelphia Depository Trust Company
 
  Transaction Code No. _______________________________________________________
 
[_]CHECK HERE IF TENDERED SHARES ARE BEING DELIVERED PURSUANT TO A NOTICE OF
   GUARANTEED DELIVERY PREVIOUSLY SENT TO THE DEPOSITARY AND COMPLETE THE
   FOLLOWING:
 
  Name(s) of Tendering Stockholder(s) ________________________________________
 
  Date of Execution of Notice of Guaranteed Delivery _________________________
 
  Window Ticket Number (if any) ______________________________________________
 
  Name of Institution which Guaranteed Delivery ______________________________
 
  If delivery is by book-entry transfer ______________________________________
 
  Name of Tendering Institution ______________________________________________
 
  Account No. _____________________________________________________________ at
 
  [_] The Depository Trust Company
 
  [_] Philadelphia Depository Trust Company
 
  Transaction Code No. _______________________________________________________
 
                                       2
<PAGE>
 
Ladies and Gentlemen:
 
  The undersigned hereby tenders to Acquisition Corp., a Delaware corporation
(the "Offeror"), a wholly owned subsidiary of Acquisition Holdings, Inc., a
Delaware corporation ("Parent"), which is wholly owned by WPG Corporate
Development Associates V, L.P., a Delaware limited partnership (the "WPG
Fund") the above-described shares of Common Stock, par value $0.01 per share
(the "Shares"), of ATC Group Services Inc., a Delaware corporation (the
"Company"), pursuant to the Offeror's offer to purchase all of the outstanding
Shares at a purchase price of $12.00 per Share, net to the seller in cash,
without interest, upon the terms and subject to the conditions set forth in
the Offer to Purchase, dated December 4, 1997 (the "Offer to Purchase"),
receipt of which is hereby acknowledged, and in this Letter of Transmittal
(which together with the Offer to Purchase constitute the "Offer"). The Offer
is being made in connection with the Agreement and Plan of Merger, dated as of
November 26, 1997 (the "Merger Agreement"), among Parent, the Offeror and the
Company.
 
  Subject to and effective upon acceptance for payment of and payment for the
Shares tendered herewith, the undersigned hereby sells, assigns and transfers
to or upon the order of the Offeror all right, title and interest in and to
all the Shares that are being tendered hereby (and any and all other Shares or
other securities issued or issuable in respect thereof on or after November
26, 1997) and appoints the Depositary the true and lawful agent and attorney-
in-fact of the undersigned with respect to such Shares (and all such other
Shares or securities), with full power of substitution (such power of attorney
being deemed to be an irrevocable power coupled with an interest), to (a)
deliver certificates for such Shares (and all such other Shares or
securities), or transfer ownership of such Shares (and all such other Shares
or securities) on the account books maintained by any of the Book-Entry
Transfer Facilities, together, in any such case, with all accompanying
evidences of transfer and authenticity, to or upon the order of the Offeror,
(b) present such Shares (and all such other Shares or securities) for transfer
on the books of the Company and (c) receive all benefits and otherwise
exercise all rights of beneficial ownership of such Shares (and all such other
Shares or securities), all in accordance with the terms of the Offer.
 
  The undersigned hereby irrevocably appoints each designee of the Offeror as
the attorney-in-fact and proxy of the undersigned, each with full power of
substitution, to exercise all voting and other rights of the undersigned in
such manner as each such attorney and proxy or his substitute shall in his
sole judgment deem proper, with respect to all of the Shares tendered hereby
which have been accepted for payment by the Offeror prior to the time of any
vote or other action (and any and all other Shares or other securities or
rights issued or issuable in respect of such Shares on or after November 26,
1997) at any meeting of stockholders of the Company (whether annual or special
and whether or not an adjourned meeting) or otherwise. This proxy is
irrevocable, shall be coupled with an interest, and is granted in
consideration of, and is effective upon, the acceptance for payment of such
Shares by the Offeror in accordance with the terms of the Offer. Such
acceptance for payment shall revoke any other proxy or written consent granted
by the undersigned at any time with respect to such Shares (and all such other
Shares or other securities or rights), and no subsequent proxies will be given
or written consents will be executed by the undersigned (and if given or
executed, will not be deemed effective).
 
  The undersigned hereby represents and warrants (and if more than one, each
undersigned hereby represents and warrants jointly and severally) that the
undersigned has full power and authority to tender, sell, assign and transfer
the Shares tendered hereby and that when the same are accepted for payment by
the Offeror, the Offeror will acquire good and unencumbered title thereto,
free and clear of all liens, restrictions, charges and encumbrances and not
subject to any adverse claims.
 
  The undersigned will, upon request, execute and deliver any additional
documents deemed by the Depositary or the Offeror to be necessary or desirable
to complete the sale, assignment and transfer of the Shares tendered hereby
(and all such other Shares or other securities or rights).
 
  All authority herein conferred or agreed to be conferred shall survive the
death, bankruptcy or incapacity of the undersigned, and any obligation of the
undersigned hereunder shall be binding upon the heirs, personal
representatives, successors and assigns of the undersigned. Except as stated
in the Offer, this tender is irrevocable.
 
                                       3
<PAGE>
 
  The undersigned understands that tenders of Shares pursuant to any one of
the procedures described in Section 2 of the Offer to Purchase and in the
instructions hereto will constitute an agreement between the undersigned and
the Offeror upon the terms and subject to the conditions of the Offer.
 
  Unless otherwise indicated under "Special Payment Instructions," please
issue the check for the purchase price of any Shares purchased, and return any
Shares not tendered or not purchased, in the name(s) of the undersigned.
Similarly, unless otherwise indicated under "Special Delivery Instructions,"
please mail the check for the purchase price of any Shares purchased and
return any certificates for Shares not tendered or not purchased (and
accompanying documents, as appropriate) to the undersigned at the address
shown below the undersigned's signature(s). In the event that both "Special
Payment Instructions" and "Special Delivery Instructions" are completed,
please issue the check for the purchase price of any Shares purchased and
return any Shares not tendered or not purchased in the name(s) of, and mail
said check and any certificates to, the person(s) so indicated. The
undersigned recognizes that the Offeror has no obligation, pursuant to the
"Special Payment Instructions," to transfer any Shares from the name of the
registered holder(s) thereof if the Offeror does not accept for payment any of
the Shares so tendered.
 
 
 
   SPECIAL PAYMENT INSTRUCTIONS              SPECIAL DELIVERY INSTRUCTIONS
 (SEE INSTRUCTIONS 1, 5, 6 AND 7)          (SEE INSTRUCTIONS 1, 5, 6 AND 7)
 
 
  To be completed ONLY if the               To be completed ONLY if the
 check for the purchase price of           check for the purchase price of
 Shares purchased or certificates          Shares purchased or certificates
 for Shares not tendered or not            for Shares not tendered or not
 purchased are to be issued in             purchased are to be mailed to
 the name of someone other than            someone other than the under-
 the undersigned.                          signed or to the undersigned at
                                           an address other than that shown
                                           below the undersigned's signa-
                                           ture(s).
 
 Issue check and/or certifi-
 cate(s) to:
 
 
 Name ____________________________         Mail check and/or certificate(s)
          (PLEASE PRINT)                   to:
 _________________________________         Name_____________________________
 Address _________________________                  (PLEASE PRINT)
 _________________________________         _________________________________
                        (ZIP CODE)         Address _________________________
 _________________________________         _________________________________
   (TAXPAYER IDENTIFICATION NO.)                                  (ZIP CODE)
     (SEE SUBSTITUTE FORM W-9)
 
                                       4
<PAGE>
 
                                 INSTRUCTIONS
 
             FORMING PART OF THE TERMS AND CONDITIONS OF THE OFFER
 
  1. Guarantee of Signatures. Except as otherwise provided below, signatures
on all Letters of Transmittal must be guaranteed by a member in good standing
of the Securities Transfer Agents Medallion Program or by any other bank,
broker, dealer, credit union, savings association or other entity which is an
"eligible guarantor institution," as such term is defined in Rule 17Ad-15
under the Securities Exchange Act of 1934, as amended (each of the foregoing
constituting an "Eligible Institution"), unless the Shares tendered thereby
are tendered (i) by a registered holder of Shares who has not completed either
the box labeled "Special Payment Instructions" or the box labeled "Special
Delivery Instructions" on the Letter of Transmittal or (ii) for the account of
an Eligible Institution. See Instruction 5. If the certificates evidencing
Shares are registered in the name of a person or persons other than the signer
of this Letter of Transmittal, or if payment is to be made or delivered to, or
certificates evidencing unpurchased Shares are to be issued or returned to, a
person other than the registered owner or owners, then the tendered
certificates must be endorsed or accompanied by duly executed stock powers, in
either case signed exactly as the name or names of the registered owner or
owners appear on the certificates or stock powers, with the signatures on the
certificates or stock powers guaranteed by an Eligible Institution as provided
herein. See Instruction 5.
 
  2. Delivery of Letter of Transmittal and Shares. This Letter of Transmittal
is to be used either if certificates are to be forwarded herewith or, unless
an Agent's Message is utilized, if the delivery of Shares is to be made by
book-entry transfer pursuant to the procedures set forth in Section 2 of the
Offer to Purchase. Certificates for all physically delivered Shares, or a
confirmation of a book-entry transfer into the Depositary's account at one of
the Book-Entry Transfer Facilities of all Shares delivered electronically, as
well as a properly completed and duly executed Letter of Transmittal (or a
manually signed facsimile thereof) and any other documents required by this
Letter of Transmittal or an Agent's Message in the case of a book-entry
delivery, must be received by the Depositary at one of its addresses set forth
on the front page of this Letter of Transmittal by the Expiration Date.
Stockholders who cannot deliver their Shares and all other required documents
to the Depositary by the Expiration Date must tender their Shares pursuant to
the guaranteed delivery procedures set forth in Section 2 of the Offer to
Purchase. Pursuant to such procedures: (a) such tender must be made by or
through an Eligible Institution; (b) a properly completed and duly executed
Notice of Guaranteed Delivery, substantially in the form provided by the
Offeror, must be received by the Depositary prior to the Expiration Date; and
(c) the certificates for all tendered Shares, in proper form for transfer (or
a Book-Entry Confirmation with respect to such Shares), together with a
properly completed and duly executed Letter of Transmittal (or a manually
signed facsimile thereof), with any required signature guarantees, or, in the
case of a book-entry transfer, an Agent's Message, and any other documents
required by this Letter of Transmittal must be received by the Depositary
within three trading days after the date of such Notice of Guaranteed
Delivery, all as provided in Section 2 of the Offer to Purchase. The term
"trading day" is any day on which NASDAQ is open for business.
 
  The method of delivery of Shares, the Letter of Transmittal and all other
required documents, including delivery through a Book-Entry Transfer Facility,
is at the election and sole risk of the tendering stockholder. If delivery is
by mail, registered mail with return receipt requested, properly insured, is
recommended. Delivery of this Letter of Transmittal and accompanying
certificate(s) will pass only when such Letter of Transmittal and accompanying
certificate(s) are actually received by the Depositary.
 
  No alternative, conditional or contingent tenders will be accepted, and no
fractional Shares will be purchased. By executing this Letter of Transmittal
(or a manually signed facsimile thereof), the tendering stockholder waives any
right to receive any notice of the acceptance for payment of the Shares.
 
  3. Inadequate Space. If the space provided herein is inadequate, the
certificate numbers and/or the number of Shares should be listed on a separate
schedule attached hereto.
 
  4. Partial Tenders (not applicable to stockholders who tender by book-entry
transfer). If fewer than all the Shares represented by any certificate
delivered to the Depositary are to be tendered, fill in the number of Shares
which are to be tendered in the box entitled "Number of Shares Tendered." In
such case, a new certificate for the remainder of the Shares represented by
the old certificate will be sent to the person(s) signing this Letter of
Transmittal unless
 
                                       5
<PAGE>
 
otherwise provided in the appropriate box on this Letter of Transmittal, as
promptly as practicable following the expiration or termination of the Offer.
All Shares represented by certificates delivered to the Depositary will be
deemed to have been tendered unless otherwise indicated.
 
  5. Signatures on Letter of Transmittal; Stock Powers and Endorsements. If
this Letter of Transmittal is signed by the registered holder(s) of the Shares
tendered hereby, the signature(s) must correspond with the name(s) as written
on the face of the certificates without alteration, enlargement or any change
whatsoever.
 
  If any of the Shares tendered hereby are held of record by two or more
persons, all such persons must sign this Letter of Transmittal.
 
  If any of the Shares tendered hereby are registered in different names on
different certificates, it will be necessary to complete, sign and submit as
many separate Letters of Transmittal as there are different registrations of
certificates.
 
  If this Letter of Transmittal is signed by the registered holder(s) of the
Shares tendered hereby, no endorsements of certificates or separate stock
powers are required unless payment of the purchase price is to be made, or
Shares not tendered or not purchased are to be returned, in the name of any
person other than the registered holder(s). Signatures on any such
certificates or stock powers must be guaranteed by an Eligible Institution.
 
  If this Letter of Transmittal is signed by a person other than the
registered holder(s) of the Shares tendered hereby, the certificate must be
endorsed or accompanied by, appropriate stock powers, in either case, signed
exactly as the name(s) of the registered holder(s) appear(s) on the
certificates for such Shares. Signature(s) on any such certificates or stock
powers must be guaranteed by an Eligible Institution.
 
  If this Letter of Transmittal or any certificate or stock power is signed by
a trustee, executor, administrator, guardian, attorney-in-fact, officer of a
corporation or other person acting in a fiduciary or representative capacity,
such person should so indicate when signing, and proper evidence satisfactory
to the Offeror of the authority of such person so to act must be submitted.
 
  6. Stock Transfer Taxes. The Offeror will pay any stock transfer taxes with
respect to the sale and transfer of any Shares to it or its order pursuant to
the Offer. If, however, payment of the purchase price is to be made to, or
Shares not tendered or not purchased are to be returned in the name of, any
person other than the registered holder(s), then the amount of any stock
transfer taxes (whether imposed on the registered holder(s), such other person
or otherwise) payable on account of the transfer to such person will be
deducted from the purchase price unless satisfactory evidence of the payment
of such taxes, or exemption therefrom, is submitted.
 
  Except as provided in this Instruction 6, it will not be necessary for
transfer tax stamps to be affixed to the certificates listed in this Letter of
Transmittal.
 
  7. Special Payment and Delivery Instruction. If the check for the purchase
price of any Shares purchased is to be issued, or any Shares not tendered or
not purchased are to be returned, in the name of a person other than the
person(s) signing this Letter of Transmittal or if the check or any
certificates for Shares not tendered or not purchased are to be mailed to
someone other than the person(s) signing this Letter of Transmittal or to the
person(s) signing this Letter of Transmittal at an address other than that
shown above, the appropriate boxes on this Letter of Transmittal should be
completed. Stockholders tendering Shares by book-entry transfer may request
that Shares not purchased be credited to such account at any of the Book-Entry
Transfer Facilities as such stockholder may designate under "Special Payment
Instructions." If no such instructions are given, any such Shares not
purchased will be returned by crediting the account at the Book-Entry Transfer
Facilities designated above.
 
  8. Substitute Form W-9. The tendering stockholder is required to provide the
Depositary with such stockholder's correct TIN on Substitute Form W-9, which
is provided below, unless an exemption applies. Failure to provide the
information on the Substitute Form W-9 may subject the tendering stockholder
to a $50 penalty and to 31% federal income tax backup withholding on the
payment of the purchase price for the Shares.
 
 
                                       6
<PAGE>
 
  9. Foreign Holders. Foreign holders must submit a completed IRS Form W-8 to
avoid 31% backup withholding. IRS Form W-8 may be obtained by contacting the
Depositary at one of the addresses on the face of this Letter of Transmittal.
 
  10. Requests for Assistance or Additional Copies. Requests for assistance or
additional copies of the Offer to Purchase and this Letter of Transmittal may
be obtained from the Information Agent or the Dealer Manager at their
respective addresses or telephone numbers set forth below.
 
  11. Waiver of Conditions. The conditions of the Offer may be waived by
Offeror (subject to certain limitations in the Merger Agreement), in whole or
in part, at any time or from time to time, in Offeror's sole discretion.
 
  Important: This letter of Transmittal or a manually signed facsimile copy
hereof (together with certificates or confirmation of book-entry transfer and
all other required documents) or a Notice of Guaranteed Delivery must be
received by the Depositary on or prior to the Expiration Date (as defined in
the Offer to Purchase).
 
                           IMPORTANT TAX INFORMATION
 
  Under federal income tax law, a stockholder whose tendered Shares are
accepted for payment is required to provide the Depositary with such
stockholder's correct TIN on the Substitute Form W-9. If such stockholder is
an individual, the TIN is such stockholder's social security number. If the
Depositary is not provided with the correct TIN, the stockholder may be
subject to a $50 penalty imposed by the Internal Revenue Service. In addition,
payments that are made to such stockholder with respect to Shares purchased
pursuant to the Offer may be subject to backup withholding.
 
  Certain stockholders (including, among others, all corporations and certain
foreign individuals) are not subject to these backup withholding and reporting
requirements. In order for a foreign individual to qualify as an exempt
recipient, that stockholder must submit a statement, signed under penalties of
perjury, attesting to that individual's exempt status. Such statements may be
obtained from the Depositary. All exempt recipients (including foreign persons
wishing to qualify as exempt recipients) should see the enclosed Guidelines
for Certification of Taxpayer Identification Number on Substitute Form W-9 for
additional instructions.
 
  If backup withholding applies, the Depositary is required to withhold 31% of
any payments made to the stockholder. Backup withholding is not an additional
tax. Rather, the tax liability of persons subject to backup withholding will
be reduced by the amount of tax withheld. If backup withholding results in an
overpayment of taxes, a refund may be obtained.
 
PURPOSE OF SUBSTITUTE FORM W-9
 
  To prevent backup federal income tax withholding on payments that are made
to a stockholder with respect to Shares purchased pursuant to the Offer, the
stockholder is required to notify the Depositary of such stockholder's correct
TIN by completing the form certifying that the TIN provided on the Substitute
Form W-9 is correct.
 
WHAT NUMBER TO GIVE THE DEPOSITARY
 
  The stockholder is required to give the Depositary the social security
number or employer identification number of the record owner of the Shares. If
the Shares are in more than one name or are not in the name of the actual
owner, consult the enclosed Guidelines for Certification of Taxpayer
Identification Number on Substitute Form W-9 for additional guidelines on
which number to report.
 
                                       7
<PAGE>
 
 
                                   SIGN HERE
                   (Complete Substitute Form W-9 on reverse)
 
 ____________________________________________________________________________
 ____________________________________________________________________________
                           Signature(s) of Owner(s)
 ____________________________________________________________________________
 Name(s) ____________________________________________________________________
 ____________________________________________________________________________
 Capacity (full title) ______________________________________________________
 Address ____________________________________________________________________
 ____________________________________________________________________________
 ____________________________________________________________________________
                                                           (Include Zip Code)
 Area Code and Telephone Number _____________________________________________
 Taxpayer Identification Number _____________________________________________
 Dated: _______________________________________________________________, 199
 
   (Must be signed by registered holder(s) exactly as name(s) appear(s) on
 stock certificate(s) or on a security position listing or by the person(s)
 authorized to become registered holder(s) by certificates and documents
 transmitted herewith. If signature is by a trustee, executor,
 administrator, guardian, attorney-in-fact, agent, officer of a corporation
 or other person acting in a fiduciary or representative capacity, please
 set forth full title and see Instruction 5).
 
                           GUARANTEE OF SIGNATURE(S)
                           (See Instructions 1 and 5)
 
 FOR USE BY FINANCIAL INSTITUTIONS ONLY, PLACE MEDALLION GUARANTEE IN SPACE
 BELOW.
 
 Authorized signature(s) ____________________________________________________
 Name _______________________________________________________________________
 Name of Firm _______________________________________________________________
 Address ____________________________________________________________________
 ____________________________________________________________________________
                                                           (Include Zip Code)
 Area Code and Telephone Number _____________________________________________
 Dated: _______________________________________________________________, 199
 
 
                                       8
<PAGE>
 
                      PAYER'S NAME: BANKERS TRUST COMPANY
- -------------------------------------------------------------------------------
 
 
                         PART I--PLEASE PROVIDE YOUR
 SUBSTITUTE              TIN IN THE BOX AT THE RIGHT     TIN: _______________
 FORM W-9                AND CERTIFY BY SIGNING AND        Social Security
                         DATING BELOW.                    Number or Employer
                                                        Identification Number
 
 DEPARTMENT OF
 THE TREASURY           ------------------------------------------------------
 INTERNAL                PART II--For Payees exempt from backup withholding,
 REVENUE                 see the enclosed Guidelines for Certification of
 SERVICE                 Taxpayer Identification Number on Substitute Form
                         W-9 and complete as instructed therein.
                        ------------------------------------------------------
 
                         Certification--Under penalties of perjury, I certify
                         that:
 PAYER'S REQUEST FOR TAXPAYER IDENTIFICATION NUMBER ("TIN") AND CERTIFICATION
                         (1) The number shown on this form is my correct TIN
                             (or I am waiting for a number to be issued to
                             me); and
                         (2) I am not subject to backup withholding because
                             (a) I am exempt from backup withholding or (b)
                             I have not been notified by the Internal
                             Revenue Service ("IRS") that I am subject to
                             backup withholding as a result of a failure to
                             report all interest or dividends, or (c) the
                             IRS has notified me that I am no longer subject
                             to backup withholding.
                        ------------------------------------------------------
 
                         Signature: __________________________   Date: ______
 
 
CERTIFICATION INSTRUCTIONS--You must cross out item (2) above if you have been
notified by the IRS that you are subject to backup withholding because of
underreporting interest or dividends on your tax return. However, if after
being notified by the IRS that you were subject to backup withholding, you
received another notification from the IRS that you were no longer subject to
backup withholding, do not cross out item (2). (Also see the instructions in
the enclosed Guidelines.)
 
NOTE: FAILURE TO COMPLETE AND RETURN THIS SUBSTITUTE FORM W-9 MAY RESULT IN
      BACKUP WITHHOLDING OF 31% OF ANY PAYMENTS MADE TO YOU PURSUANT TO THE
      OFFER. PLEASE REVIEW THE ENCLOSED GUIDELINES FOR CERTIFICATION OF
      TAXPAYER IDENTIFICATION NUMBER ON SUBSTITUTE FORM W-9 FOR ADDITIONAL
      DETAILS.
 
    YOU MUST COMPLETE THE FOLLOWING CERTIFICATE IF YOU ARE AWAITING YOUR
    TIN.
 
 
            CERTIFICATE OF AWAITING TAXPAYER IDENTIFICATION NUMBER
 
   I certify under penalties of perjury that a TIN has not been issued to
 me, and either (1) I have mailed or delivered an application to receive a
 TIN to the appropriate IRS Center or Social Security Administration
 Officer or (2) I intend to mail or deliver an application in the near
 future. I understand that if I do not provide a TIN by the time of
 payment, 31% of all payments pursuant to the Offer made to me thereafter
 will be withheld until I provide a number.
 
 Signature: ____________________________________________   Date: ___________
 
 
                                       9
<PAGE>
 
                    The Information Agent for the Offer is:
 
                                 MACKENZIE
                                PARTNERS, INC.
                                156 Fifth Avenue
                            New York, New York 10010
                          Call Collect: (212) 929-5500
                         Call Toll-Free: (800) 322-2885
 
                      The Dealer Manager for the Offer is:
 
                          BT ALEX. BROWN INCORPORATED
                         130 Liberty Street, 30th Floor
                            New York, New York 10006
                          Call Collect: (212) 250-2500

<PAGE>
                                                
                                                                EXHIBIT (a)(3)
 
BT ALEX. BROWN INCORPORATED
130 LIBERTY STREET, 30TH FLOOR
NEW YORK, NEW YORK 10006
 
                          OFFER TO PURCHASE FOR CASH
                    ALL OUTSTANDING SHARES OF COMMON STOCK
                                      OF
 
                            ATC GROUP SERVICES INC.
                                      AT
                             $12.00 NET PER SHARE
                                      BY
                               ACQUISITION CORP.
                           AN INDIRECT SUBSIDIARY OF
 
                 WPG CORPORATE DEVELOPMENT ASSOCIATES V, L.P.
 
 THE OFFER AND WITHDRAWAL RIGHTS WILL EXPIRE AT 12:00 MIDNIGHT, NEW YORK CITY
           TIME, ON JANUARY 21, 1998, UNLESS THE OFFER IS EXTENDED.
 
 
                                                               December 4, 1997
 
To Brokers, Dealers, Commercial Banks,
 Trust Companies and Other Nominees:
 
  We have been appointed by Acquisition Corp., a Delaware corporation (the
"Offeror"), a wholly owned subsidiary of Acquisition Holdings, Inc., a
Delaware Corporation ("Parent"), which is wholly owned by WPG Corporate
Development Associates V, L.P., a Delaware limited partnership (the "WPG
Fund") to act as Dealer Manager in connection with the Offeror's offer to
purchase all outstanding shares of Common Stock, par value $0.01 per share
(the "Shares"), of ATC Group Services Inc., a Delaware corporation (the
"Company"), at a purchase price of $12.00 per Share, net to the seller in
cash, without interest, upon the terms and subject to the conditions set forth
in the Offer to Purchase, dated December 4, 1997 (the "Offer to Purchase"),
and in the related Letter of Transmittal (which together constitute the
"Offer") enclosed herewith. The Offer is being made in connection with the
Agreement and Plan of Merger, dated as of November 26, 1997, among Parent, the
Offeror and the Company (the "Merger Agreement"). Holders of Shares whose
certificates for such Shares (the "Certificates") are not immediately
available or who cannot deliver their Certificates and all other required
documents to the Depository or complete the procedures for book-entry transfer
prior to the Expiration Date (as defined in Section 1 of the Offer to
Purchase) must tender their Shares according to the guaranteed delivery
procedures set forth in Section 2 of the Offer to Purchase.
 
  Please furnish copies of the enclosed materials to those of your clients for
whose accounts you hold Shares in your name or in the name of your nominee.
 
  Enclosed herewith for your information and forwarding to your clients are
copies of the following documents:
 
    1. The Offer to Purchase, dated December 4, 1997.
 
    2. The Letter of Transmittal to tender Shares for your use and for the
  information of your clients facsimile copies of the Letter of Transmittal
  (with manual signatures) may be used to tender Shares.
<PAGE>
 
    3. The Solicitation/Recommendation Statement on Schedule 14D-9 filed with
  the Securities and Exchange Commission by the Company and mailed to the
  stockholders of the Company.
 
    4. The Notice of Guaranteed Delivery for Shares to be used to accept the
  Offer if neither of the two procedures for tendering Shares set forth in
  the Offer to Purchase can be completed on a timely basis.
 
    5. A printed form of letter which may be sent to your clients for whose
  accounts you hold Shares registered in your name, with space provided for
  obtaining such clients' instructions with regard to the Offer.
 
    6. Guidelines of the Internal Revenue Service for Certification of
  Taxpayer Identification Number on Substitute Form W-9.
 
    7. A return envelope addressed to the Depository.
 
  YOUR PROMPT ACTION IS REQUESTED. WE URGE YOU TO CONTACT YOUR CLIENTS AS
PROMPTLY AS POSSIBLE, PLEASE NOTE THAT THE OFFER AND WITHDRAWAL RIGHTS WILL
EXPIRE AT 12:00 MIDNIGHT, NEW YORK CITY TIME, ON JANUARY 21, 1998 UNLESS THE
OFFER IS EXTENDED.
 
  Please note the following:
 
    1. The tender price is $12.00 per Share, net to the seller in cash
  without interest.
 
    2. The Offer is being made for all of the outstanding Shares.
 
    3. The Offer and withdrawal rights will expire at 12:00 Midnight, New
  York City time, on January 21, 1998, unless the Offer is extended (the
  "Expiration Date").
 
    4. The Offer is conditioned upon, among other things (i) there being
  validly tendered and not withdrawn prior to the Expiration Date that number
  of Shares constituting a majority of the outstanding Shares (determined on
  a fully diluted basis for all outstanding stock options and any other
  rights to acquire Shares); (ii) the Offeror having received financing in
  amounts sufficient to consummate the Offer and the Merger (as defined in
  the Offer to Purchase), including, without limitation, (a) to pay, with
  respect to all common stock in the Merger, the Merger Consideration (as
  defined in the Offer to Purchase), (b) to refinance the outstanding
  indebtedness of the Company, (c) to pay any fees and expenses in connection
  with the Offer and the Merger or the financing thereof and (d) to provide
  for the working capital needs of the Company following the Merger,
  including, without limitation, if applicable, letters of credit; (iii) the
  expiration or termination of the applicable waiting period under the Hart-
  Scott-Rodino Antitrust Improvements Act of 1976, as amended and (iv) the
  satisfaction of certain other terms and conditions. See Section 15 of the
  Offer to Purchase.
 
    5. Tendering stockholders will not be obligated to pay brokerage fees or
  commissions or, except as set forth in Instruction 6 of the Letter of
  Transmittal, stock transfer taxes on the transfer of Shares pursuant to the
  Offer.
 
  In order to take advantage of the Offer, (i) a duly executed and properly
completed Letter of Transmittal (or a manually signed facsimile thereof) and
any required signature guarantees or, in the case of a book-entry transfer, an
Agent's Message (as defined in the Offer to Purchase) or other required
documents should be sent to the Depositary and (ii) Certificates representing
the tendered Shares or a timely Book-Entry Confirmation (as defined in the
Offer to Purchase) should be delivered to the Depositary in accordance with
the instructions set forth in the Offer.
 
  If holders of Shares wish to tender, but it is impracticable for them to
forward their Certificates or other required documents or complete the
procedures for book-entry transfer prior to the Expiration Date, a tender may
be effected by following the guaranteed delivery procedures specified in
Section 2 of the Offer to Purchase.
 
  Neither the Offeror, the Parent nor any officer, director, stockholder,
agent or other representative of the Offeror will pay any fees or commissions
to any broker, dealer or other person (other than the Dealer Manager,
 
                                       2
<PAGE>
 
the Depositary and the Information Agent as described in the Offer to
Purchase) for soliciting tenders of Shares pursuant to the Offer. The Offeror
will, however, upon request, reimburse you for customary mailing and handling
expenses incurred by you in forwarding any of the enclosed materials to your
clients. The Offeror will pay or cause to be paid any transfer taxes payable
on the transfer of Shares to it, except as otherwise provided in Instruction 6
of the Letter of Transmittal.
 
  Any inquiries you may have with respect to the Offer should be addressed to
MacKenzie Partners, Inc., the Information Agent for the Offer, 156 Fifth
Avenue, New York, New York 10010, (800) 322-2885 (toll-free) or BT Alex. Brown
Incorporated, the Dealer Manager for the Offer, at 130 Liberty Street, 30th
Floor, New York, New York 10006, (212) 250-2500 (call collect).
 
  Requests for additional copies of the enclosed materials may be directed to
the Information Agent at the above address and telephone number.
 
                                          Very truly yours,
 
                                          BT Alex. Brown Incorporated
 
  NOTHING CONTAINED HEREIN OR IN THE ENCLOSED DOCUMENTS SHALL CONSTITUTE YOU
OR ANY OTHER PERSON THE AGENT OF THE PARENT, THE OFFEROR, THE DEPOSITARY, THE
INFORMATION AGENT, THE DEALER MANAGER OR ANY AFFILIATE OF ANY OF THEM, OR
AUTHORIZE YOU OR ANY OTHER PERSON TO MAKE ANY STATEMENT OR USE ANY DOCUMENT ON
BEHALF OF ANY OF THEM IN CONNECTION WITH THE OFFER OTHER THAN THE ENCLOSED
DOCUMENTS AND THE STATEMENTS CONTAINED THEREIN.
 
                                       3

<PAGE>
                                                                EXHIBIT (a)(4)

 
                          OFFER TO PURCHASE FOR CASH
                    ALL OUTSTANDING SHARES OF COMMON STOCK
                                      OF
                            ATC GROUP SERVICES INC.
                                      AT
                             $12.00 NET PER SHARE
                                      BY
                               ACQUISITION CORP.
                           AN INDIRECT SUBSIDIARY OF
                 WPG CORPORATE DEVELOPMENT ASSOCIATES V, L.P.
 
 THE OFFER AND WITHDRAWAL RIGHTS WILL EXPIRE AT 12:00 MIDNIGHT, NEW YORK CITY
           TIME, ON JANUARY 21, 1998, UNLESS THE OFFER IS EXTENDED.
 
                                                               December 4, 1997
 
To Our Clients:
 
  Enclosed for your consideration are the Offer to Purchase, dated December 4,
1997 (the "Offer to Purchase"), and the related Letter of Transmittal (which
together constitute the "Offer"), relating to an offer by Acquisition Corp., a
Delaware corporation (the "Offeror"), a wholly owned subsidiary of Acquisition
Holdings, Inc., a Delaware Corporation (the "Parent"), which is wholly owned
by WPG Corporate Development Associates V, L.P., a Delaware limited
partnership (the "WPG Fund"), to purchase all outstanding shares of Common
Stock, par value $0.01 per share (the "Shares"), of ATC Group Services Inc., a
Delaware corporation (the "Company"), at a purchase price of $12.00 per Share,
net to the seller in cash, without interest, upon the terms and subject to the
conditions set forth in the Offer. The Offer is being made in connection with
the Agreement and Plan of Merger, dated as of November 26, 1997, among the
Parent, the Offeror and the Company (the "Merger Agreement"). This material is
being forwarded to you as the beneficial owner of Shares carried by us in your
account but not registered in your name.
 
  A tender of such Shares can be made only by us as the holder of record and
pursuant to your instructions. The Letter of Transmittal is furnished to you
for your information only and cannot be used by you to tender Shares held by
us for your account.
 
  Accordingly, we request instructions as to whether you wish to tender any or
all of the Shares held by us for your account, upon the terms and conditions
set forth in the Offer.
 
  Please note the following:
 
    1. The tender price is $12.00 per Share, net to the seller in cash
  without interest.
 
    2. The Offer is being made for all of the outstanding Shares.
 
    3. The Offer and withdrawal rights will expire at 12:00 Midnight, New
  York City time, on January 21, 1998, unless the Offer is extended (the
  "Expiration Date").
 
    4. The Offer is conditioned upon, among other things (i) there being
  validly tendered and not withdrawn prior to the Expiration Date that number
  of Shares constituting a majority of the outstanding Shares (determined on
  a fully diluted basis for all outstanding stock options and any other
  rights to acquire
<PAGE>
 
  Shares); (ii) the Offeror having received financing in amounts sufficient
  to consummate the Offer and the Merger (as defined in the Offer to
  Purchase), including, without limitation, (a) to pay, with respect to all
  common stock in the Merger, the Merger Consideration (as defined in the
  Offer to Purchase), (b) to refinance the outstanding indebtedness of the
  Company, (c) to pay any fees and expenses in connection with the Offer and
  the Merger or the financing thereof and (d) to provide for the working
  capital needs of the Company following the Merger, including, without
  limitation, if applicable, letters of credit; (iii) the expiration or
  termination of the applicable waiting period under the Hart-Scott-Rodino
  Antitrust Improvements Act of 1976, as amended and (iv) the satisfaction of
  certain other terms and conditions. See Section 15 of the Offer to
  Purchase.
 
    5. Tendering stockholders will not be obligated to pay brokerage fees or
  commissions or, except as set forth in Instruction 6 of the Letter of
  Transmittal, stock transfer taxes on the transfer of Shares pursuant to the
  Offer.
 
  If you wish to have us tender any or all of the Shares, please so instruct
us by completing, executing, detaching and returning to us the instruction
form contained in this letter. An envelope to return your instruction to us is
enclosed. If you authorize tender of your Shares, all such Shares will be
tendered unless otherwise indicated in such instruction form. PLEASE FORWARD
YOUR INSTRUCTIONS TO US AS SOON AS POSSIBLE TO ALLOW US AMPLE TIME TO TENDER
YOUR SHARES ON YOUR BEHALF PRIOR TO THE EXPIRATION OF THE OFFER.
 
  The Offer is made solely by the Offer to Purchase and the related Letter of
Transmittal and any supplements or amendments thereto. The Offer is not being
made to, nor will tenders be accepted from or on behalf of, holders of Shares
residing in any jurisdiction in which the making of the Offer or acceptance
thereof would not be in compliance with the securities laws of such
jurisdiction. In any jurisdiction where the securities, blue sky or other laws
require the Offer to be made by a licensed broker or dealer, the Offer will be
deemed to be made on behalf of the Offeror by BT Alex. Brown Incorporated or
by one or more registered brokers or dealers licensed under the laws of such
jurisdiction.
 
                                       2
<PAGE>
 
  INSTRUCTIONS WITH RESPECT TO THE OFFER TO PURCHASE FOR CASH ALL OUTSTANDING
               SHARES OF COMMON STOCK OF ATC GROUP SERVICES INC.
 
  The undersigned acknowledge(s) receipt of your letter and the enclosed Offer
to Purchase dated December 4, 1997, and the related Letter of Transmittal
(which together constitute the "Offer") in connection with the offer by
Acquisition Corp., a Delaware corporation (the "Offeror"), a wholly owned
subsidiary of Acquisition Holdings, Inc., a Delaware Corporation, a wholly
owned subsidiary of WPG Corporate Development Associates V, L.P., a Delaware
limited partnership, to purchase all outstanding shares of Common Stock, par
value $0.01 per share (the "Shares"), of ATC Group Services Inc., a Delaware
corporation.
 
  This will instruct you to tender to the Offeror the number of Shares
indicated below (or if no number is indicated below, all Shares) which are
held by you for the account of the undersigned, upon the terms and subject to
the conditions set forth in the Offer.
 
 
   Number of Shares to be
         Tendered:*
 
                                                        SIGN HERE
                                          -------------------------------------
 
                                          -------------------------------------
Account Number:                                       Signature(s)
 
                                          -------------------------------------
Date:                                     -------------------------------------
                                                     (Print Name(s))
 
Date:                                     -------------------------------------
                                          -------------------------------------
                                                   (Print Address(es))
                                          -------------------------------------
                                           (Area Code and Telephone Number(s))
                                          -------------------------------------
                                            (Taxpayer Identification orSocial
                                                   Security Number(s))
 
- --------
* Unless otherwise indicated, it will be assumed that all Shares held by us
  for your account are to be tendered.
 
                                       3

<PAGE>
 
                                                                 EXHIBIT (a)(5)
 
                         NOTICE OF GUARANTEED DELIVERY
 
                                      FOR
 
                       TENDER OF SHARES OF COMMON STOCK
 
                                      OF
 
                            ATC GROUP SERVICES INC.
 
 
 THE OFFER AND WITHDRAWAL RIGHTS WILL EXPIRE AT 12:00 MIDNIGHT, NEW YORK CITY
           TIME, ON JANUARY 21, 1998, UNLESS THE OFFER IS EXTENDED.
 
 
  This form, or one substantially equivalent hereto, must be used to accept
the Offer (as defined below) if certificates for shares of Common Stock, par
value $0.01 per share (the "Shares"), of ATC Group Services Inc., a Delaware
corporation (the "Company"), are not immediately available or if the procedure
for book-entry transfer cannot be completed on a timely basis or time will not
permit all required documents to reach the Depositary on or prior to the
Expiration Date (as defined in the Offer to Purchase). Such form may be
delivered by hand, facsimile transmission, or mail to the Depositary. See
Section 3 of the Offer to Purchase, dated December 4, 1997 (the "Offer to
Purchase").
 
                       The Depositary for the Offer is:
 
                             BANKERS TRUST COMPANY
 
         By Mail:           By Overnight or Courier           By Hand:
 
 
 
  BT Services Tennessee,  BT Services Tennessee, Inc.  Bankers Trust Company
           Inc.         Corporate Trust & Agency GroupCorporate Trust & Agency
   Reorganization Unit        Reorganization Unit              Group
     P.O. Box 292737        648 Grassmere Park Road     Attn: Reorganization
   Nashville, Tennessee   Nashville, Tennessee 37211         Department
        37229-2737                                   Receipt & Delivery Window
                                                       123 Washington Street,
                                                             1st Floor
                                                      New York, New York 10006
 
  Facsimile Transmission     Confirm by Telephone:          Information:
         Number:                (615) 835-3572             (800) 735-7777
      (615) 835-3701
 
  DELIVERY OF THIS NOTICE OF GUARANTEED DELIVERY TO AN ADDRESS, OR
TRANSMISSION OF INSTRUMENTS VIA A FACSIMILE, OTHER THAN AS SET FORTH ABOVE,
DOES NOT CONSTITUTE A VALID DELIVERY.
 
  This Notice of Guaranteed Delivery is not to be used to guarantee
signatures. If a signature on a Letter of Transmittal is required to be
guaranteed by an "Eligible Institution" under the instructions thereto, such
signature guarantee must appear in the applicable space provided in the
signature box on the Letter of Transmittal.
 
  The Eligible Institution that completes this form must communicate the
guarantee to the Depositary and must deliver the Letter of Transmittal or an
Agent's Message and certificates for Shares to the Depositary within the time
period shown herein. Failure to do so could result in a financial loss to such
Eligible Institution.
 
             THE GUARANTEE ON THE REVERSE SIDE MUST BE COMPLETED.
<PAGE>
 
Ladies and Gentlemen:
 
  The undersigned hereby tenders to Acquisition Corp., a Delaware corporation,
upon the terms and subject to the conditions set forth in the Offer to
Purchase, and the related Letter of Transmittal, receipt of which are hereby
acknowledged, Shares of the Company, pursuant to the guaranteed delivery
procedure set forth in Section 2 of the Offer to Purchase.
 
Number of Shares: ___________________
 
Certificate No(s). (if available):                     SIGN HERE
 
_____________________________________    Name(s)
 
_____________________________________    _____________________________________
 
If securities will be tendered by
book-entry transfer__________________
                                         _____________________________________
                                                    (Please Print)
 
Name of Tendering Institution:           Address: ____________________________
 
_____________________________________    _____________________________________
                                                                    (Zip Code)
Account Number: __________________ at
[_] Bankers Trust Company
                                         Area Code and Telephone No.:
 
                                         _____________________________________
 
                                         Signature(s): _______________________
 
                                         _____________________________________
 
                                   GUARANTEE
                   (NOT TO BE USED FOR SIGNATURE GUARANTEE)
 
  The undersigned, a bank, broker, dealer, credit union, savings association
or other entity which is a member in good standing of the Securities Transfer
Agents Medallion Program or a bank, broker, dealer, credit union, savings
association or other entity which is an "eligible guarantor institution," as
such term is defined in Rule 17Ad-15 under the Securities Exchange Act of
1934, as amended, guarantees the delivery to the Depositary of the Shares
tendered hereby, together with a properly completed and duly executed Letter
of Transmittal (or manually signed facsimile(s) thereof) and any other
required documents, or an Agent's Message (as defined in the Offer to
Purchase) in the case of a book-entry delivery of Shares, all within three New
York Stock Exchange trading days of the date hereof.
 
Name of Firm: _______________________    Title: ______________________________
 
_____________________________________    Name: _______________________________
       (Authorized Signature)                   (Please Print or Type)
 
Address: ____________________________    Area Code and Telephone No: _________
 
DO NOT SEND CERTIFICATES FOR SHARES WITH THIS FORM--CERTIFICATES SHOULD BE
SENT WITH LETTER OF TRANSMITTAL
 
Date:         , 1997
 
                                       2

<PAGE>

                                                                EXHIBIT (a)(6)
 
            GUIDELINES FOR CERTIFICATION OF TAXPAYER IDENTIFICATION
                         NUMBER ON SUBSTITUTE FORM W-9
 
GUIDELINES FOR DETERMINING THE PROPER IDENTIFICATION NUMBER TO GIVE THE
PAYER -- Social Security numbers have nine digits separated by two hyphens:
i.e. 000-00-0000. Employer identification numbers have nine digits separated
by only one hyphen: i.e., 00-0000000. The table below will help determine the
number to give the payer.
 
- -------------------------------------------------------------------------------
<TABLE>
<CAPTION>
                                               GIVE THE TAXPAYER
 FOR THIS TYPE OF ACCOUNT:                     IDENTIFICATION
                                               NUMBER OF --
- ----------------------------------------------------------------
 <S>                                           <C>
  1. An individual's account                   The individual
  2. Two or more individuals (joint            The actual owner
    account)                                   of the account
                                               or, if combined
                                               funds, the first
                                               individual on
                                               the account(1)
  3. Husband and wife (joint account)          The actual owner
                                               of the account
                                               or, if joint
                                               funds, either
                                               person(1)
  4. Custodian account of a minor              The minor(2)
    (Uniform Gift to Minors Act)
  5. Adult and minor (joint account)           The adult or, if
                                               the minor is the
                                               only
                                               contributor, the
                                               minor(1)
  6. Account in the name of guardian or        The ward, minor,
    committee for a designated ward,           or
    minor, or incompetent person(3)            incompetent(3)
  7. a. The usual revocable savings trust      The grantor-
    account (grantor is also trustee)          trustee(1)
     b. So-called trust account that is not a  The actual
    legal or valid trust under State  law      owner(1)
  8. Sole proprietorship account               The owner(4)
</TABLE>
 
- -------------------------------------------------------------------------------
- -------------------------------------------------------------------------------
<TABLE>
<CAPTION>
                                                               GIVE THE TAXPAYER
FOR THIS TYPE OF ACCOUNT:                                      IDENTIFICATION
                                                               NUMBER OF --
- --------------------------------------------------------------------------------
<S>                                                            <C>
 9. A valid trust, estate, or pension trust                    The legal entity
                                                               (Do not furnish
                                                               the identifying
                                                               number of the
                                                               personal
                                                               representative
                                                               or trustee
                                                               unless the legal
                                                               entity itself is
                                                               not designated
                                                               in the account
                                                               title.)(5)
10. Corporate account                                          The corporation
11. Religious, charitable, or educational organization         The organization
12. Partnership account held in the name of the business       The partnership
13. Association, club, or other tax-exempt organization        The organization
14. A broker or registered nominee                             The broker or
                                                               nominee
15. Account with the Department of Agriculture in the name of  The public
   a public entity (such as a State or local government,       entity
   school district, or prison) that receives agricultural
   program payments
</TABLE>
 
 
- -------------------------------------------------------------------------------
(1) List first and circle the name of the person whose number you furnish.
(2) Circle the minor's name and furnish the minor's social security number.
(3) Circle the ward's, minor's or incompetent person's name and furnish such
  person's social security number or employer identification number.
(4) Show your individual name. You may also enter your business name. You may
  use your social security number or employer identification number.
(5) List first and circle the name of the legal trust, estate, or pension
trust.
 
NOTE: If no name is circled when there is more than one name, the number will
    be considered to be that of the first name listed.
<PAGE>
 
            GUIDELINES FOR CERTIFICATION OF TAXPAYER IDENTIFICATION
                         NUMBER ON SUBSTITUTE FORM W-9
                                    PAGE 2
OBTAINING A NUMBER
If you don't have a taxpayer identification number or you do not know your
number, obtain Form SS-5, Application for a Social Security Number Card (for
individuals), or Form SS-4, Application for Employer Identification Number
(for businesses and all other entities), at the local office of the Social Se-
curity Administration or the Internal Revenue Service and apply for a number.
 
PAYEES EXEMPT FROM BACKUP WITHHOLDING
Payees specifically exempted from backup withholding on ALL payments include
the following:
 . A corporation.
 . A financial institution.
 . An organization exempt from tax under section 501(a) of the Internal Reve-
   nue Code of 1986, as amended (the "Code"), or an individual retirement
   plan.
 . The United States or any agency or instrumentality thereof.
 . A State, the District of Columbia, a possession of the United States, or
   any subdivision or instrumentality thereof.
 . A foreign government, a political subdivision of a foreign government, or
   any agency or instrumentality thereof.
 . An international organization or any agency or instrumentality thereof.
 . A registered dealer in securities or commodities registered in the U.S. or
   a possession of the U.S.
 . A real estate investment trust.
 . A common trust fund operated by a bank under section 584(a) of the Code.
 . An exempt charitable remainder trust, or a non-exempt trust described in
   section 4947(a)(1).
 . An entity registered at all times under the Investment Company Act of 1940.
 . A foreign central bank of issue.
 . A futures commission merchant registered with the Commodity Futures Trading
   Commission.
 Payments of dividends and patronage dividends not generally subject to backup
withholding include the following:
 . Payments to nonresident aliens subject to withholding under section 1441 of
   the Code.
 . Payments to partnerships not engaged in a trade or business in the U.S. and
   which have at least one nonresident partner.
 . Payments of patronage dividends where the amount received is not paid in
   money.
 . Payments made by certain foreign organizations.
 . Payments made to an appropriate nominee.
 . Section 404(k) payments made by an ESOP.
 Payments of interest not generally subject to backup withholding include the
following:
 . Payments of interest on obligations issued by indi- viduals. NOTE: You may
   be subject to backup withholding if this interest is $600 or more and is
   paid in the course of the payer's trade or business and you have not pro-
   vided your correct taxpayer identification number to the payer.
 . Payments of tax-exempt interest (including exempt-interest dividends under
   section 852 of the Code).
 . Payments described in section 6049(b)(5) of the Code to non-resident al-
   iens.
 . Payments on tax-free covenant bonds under section 1451 of the Code.
 . Payments made by certain foreign organizations.
 . Payments of mortgage interest to you.
 . Payments made to an appropriate nominee.
Exempt payees described above should file Form W-9 to avoid possible erroneous
backup withholding. FILE THIS FORM WITH THE PAYER. FURNISH YOUR TAXPAYER IDEN-
TIFICATION NUMBER, WRITE "EXEMPT" ON THE FACE OF THE FORM, AND RETURN IT TO
THE PAYER. IF THE PAYMENTS ARE INTEREST, DIVIDENDS, OR PATRONAGE DIVIDENDS,
ALSO SIGN AND DATE THE FORM. IF YOU ARE A NONRESIDENT ALIEN OR A FOREIGN EN-
TITY NOT SUBJECT TO BACKUP WITHHOLDING, FILE WITH PAYER A COMPLETED INTERNAL
REVENUE FORM W-8 (CERTIFICATE OF FOREIGN STATUS).
 Certain payments other than interest, dividends, and patronage dividends,
that are not subject to information reporting are also not subject to backup
withholding. For details, see the regulations under sections 6041, 6041A(a),
6045, and 6050A.
PRIVACY ACT NOTICE.--Section 6109 requires most recipients of dividend, inter-
est, or other payments to give correct taxpayer identification numbers to pay-
ers who must report the payments to the IRS. The IRS uses the numbers for
identification purposes. Payers must be given the numbers whether or not re-
cipients are required to file a tax return. Payers must generally withhold 31%
of taxable interest, dividend, and certain other payments to a payee who does
not furnish a correct taxpayer identification number to a payer. Certain pen-
alties may also apply.
 
PENALTIES
(1) PENALTY FOR FAILURE TO FURNISH TAXPAYER IDENTIFICATION NUMBER.--If you
fail to furnish your correct taxpayer identification number to a payer, you
are subject to a penalty of $50 for each failure unless your failure is due to
reasonable cause and not to willful neglect.
(2) FAILURE TO REPORT CERTAIN DIVIDEND AND INTEREST PAYMENTS.--If you fail to
include any portion of an includable payment for interest, dividends, or pat-
ronage dividends in gross income, such failure will be treated as being due to
negligence and will be subject to a penalty of 20% on any portion of an
underpayment attributable to that failure unless there is clear and convincing
evidence to the contrary.
(3) CIVIL PENALTY FOR FALSE INFORMATION WITH RESPECT TO WITHHOLDING.--If you
make a false statement with no reasonable basis which results in no imposition
of backup withholding, you are subject to a penalty of $500.
(4) CRIMINAL PENALTY FOR FALSIFYING INFORMATION.--Willfully falsifying certi-
fications or affirmations may subject you to criminal penalties including
fines and/or imprisonment.
FOR ADDITIONAL INFORMATION CONTACT YOUR TAX CONSULTANT OR THE INTERNAL REVENUE
SERVICE

<PAGE>
 
                                                                  Exhibit (a)(7)


                                  [ATC LOGO]



FOR IMMEDIATE RELEASE
- ---------------------

Company Contact                                     NASDAQ: Symbol
- ---------------                                     --------------
Morry F. Rubin                                      Common Stock - ATCS
President and Chief Executive Officer               Class C Warrants - ATCSL
ATC Group Services, Inc.
Tel: (212) 353-8280
Fax: (212) 598-4283



                            ATC GROUP SERVICES INC.

NEW YORK, NY, OCTOBER 17, 1997. ATC Group Services, Inc., (NASDAQ-NMS: "ATCS"),
announced today that it had received an offer for the acquisition of the company
at $12 per share from a group lead by senior members of management and a
financial investor group, WPG Corporate Development Associates V, L.P., an
affiliate of Weiss, Peck & Greer, L.L.C. The offer is supported by ATC
shareholders who hold in the aggregate approximately 28% of the outstanding
common stock of ATC on a fully diluted basis. The Company said that its board
will form a special committee of independent directors to consider the proposed
transactions.

The offer contemplates a cash tender offer for all outstanding shares of ATC 
common stock followed by a second-step merger with an acquisition corporation. 
The tender offer is conditioned, among other things, on obtaining financing, 
as is customary for transactions of this nature, and a minimum of 50.1% of the 
outstanding ATC shares being tendered. The offer is supported by a "highly 
confident" letter from a nationally recognized financing institution.

ATC is a specialized national provider of technical and project management 
services to a large, diverse customer base of Fortune 500 corporations, other 
businesses and federal, state, and government agencies. The Company's technical 
and project management services consist primarily of environmental and 
consulting engineering services and information technology services.

Weiss, Peck & Greer, L.L.C. is a private investment firm, founded in 1970, 
which manages in excess of $14 billion in public equities and fixed-income 
securities for institutional and individual clients worldwide. In addition to 
its money management activities, the firm has a twenty-seven year history as an 
investor of equity capital in over 200 venture capital and private equity 
transactions. Investments of the Private Equity Group are made through a $230 
million fund of committed capital, WPG Corporate Development Associates V, L.P.



     104 E. 25th St., Tenth Floor . New York, NY 10010 . (212) 353-8280 .
                              FAX (212) 353-8306


<PAGE>
 
                                                                EXHIBIT (a)(8)

FOR IMMEDIATE RELEASE
- ---------------------

ATC Group Services Inc. Contact
- -------------------------------
Morry F. Rubin
President and Chief Executive Officer
ATC Group Services Inc.
Tel: (212) 353-8220

Weiss, Peck & Greer Contact                             NASDAQ:SYMBOL
- ---------------------------                             -------------
Daniel H. Burch                                         Common Stock - ATCS
President                                               Class C Warrants - ATCSL
MacKenzie Partners, Inc.                                
Tel: (212) 929-5748


                            ATC GROUP SERVICES INC.
                          WEISS, PECK & GREER, L.L.C.
                                        
NEW YORK, NY, November 28, 1997.  ATC Group Services Inc., (NASDAQ-NMS: "ATCS"),
announced today that it had entered into a definitive agreement with a group led
by senior members of management and a financial investor group, WPG Corporate
Development Associates V, L.P., an affiliate of Weiss, Peck & Greer, L.L.C. to
merge in an all-cash transaction valued at approximately $150 million, including
assumed debt of ATC.  WPG Corporate Development Associates V, L.P., through an
indirect subsidiary, will commence an all-cash tender offer for all outstanding
shares of ATC Group Services Inc. at a price of $12 per share, to be followed by
a second-step merger with an acquisition corporation.  A special committee
established by the Board of Directors of ATC to consider the offer has been
advised by Lehman Brothers Inc. that the transaction is fair to ATC's
stockholders from a financial point of view.  The offer is supported by ATC
stockholders who hold in the aggregate approximately 24% of the outstanding
common stock of ATC on a fully diluted basis.

The expiration date of the tender offer is to be January 21, 1998, unless
extended pursuant to the terms of the offer.  The tender offer is conditioned,
among other things, on obtaining financing, a minimum of 50.1% of the
outstanding ATC shares being tendered and the expiration of any waiting periods
under the Hart-Scott-Rodino Antitrust Improvements Act of 1976, as amended,
related to the acquisition.  The offer is supported by a "highly confident"
letter supporting the placement by BT Alex. Brown incorporated of up to $100
million of senior subordinated notes and a commitment letter from Bankers Trust
Company with respect to a loan of up to $50 million of senior secured debt.

ATC is a specialized national provider of technical and project management
services to a large, diverse customer base of Fortune 500 corporations, other
businesses and federal, state, and government agencies.  The company's technical
and project management services consist primarily of environmental and
consulting engineering services and information technology services.
<PAGE>
 
Weiss, Peck & Greer, L.L.C. is a private investment firm, founded in 1970, which
manages in excess of $14 billion in public equities and fixed-income securities
for institutional and individual clients worldwide.  In addition to its money
management activities, the firm has a twenty-seven year history as an investor
of equity capital in over 200 venture capital and private equity transactions.
Investments of the private equity group are made through a $230 million fund of
committed capital, WPG Corporate Development Associates V, L.P.



                                       2

<PAGE>
 
                                                                  EXHIBIT (b)(1)

                          BT ALEX. BROWN INCORPORATED
                              130 LIBERTY STREET
                           NEW YORK, NEW YORK  10006

                                                        November 25, 1997

Weiss, Peck & Greer, L.L.C.
One New York Plaza
New York, NY  10004

Attention:  Mr. Steven N. Hutchinson
            Principal

Gentlemen:

          You have advised BT Alex. Brown Incorporated ("BTAB") of your
intention to enter into a transaction (the "Transaction") in which a company
("Newco") formed by you would acquire all of the outstanding capital stock or
all or substantially all of the assets of ATC Group Services Inc. (the "Acquired
Business").  You have asked us to assist you in raising a portion of the funds
required to consummate the Transaction through the sale or placement of senior
subordinated debt securities (the "Notes") to be issued by Newco and the
arrangement of senior bank financing (the "Bank Debt", and together with the
Notes, the "Acquisition Financing").  The aggregate principal amount of
Acquisition Financing to be funded on the closing of the Transaction will be
approximately $125 million, with undrawn revolving debt capacity of
approximately $25 million.

          We understand that the cash proceeds to be paid to the sellers of the
Acquired Business in connection with the Transaction will be approximately
$103.1 million and the total amount of funds necessary to effect the
Transaction, to refinance existing debt of the Acquired Business and to pay all
fees and expenses incurred in connection therewith will be provided through (i)
the Acquisition Financing, (ii) at least $25,000,000 from the issuance of
capital stock of Newco and (iii) at least $2,500,000 of equity contributed by
management.  It is our understanding that other than the Acquisition Financing,
Newco will have no other indebtedness for money borrowed after giving effect to
the consummation of the Transaction.

          We are pleased to inform you that, based upon our understanding of the
Transaction as summarized above and current 
<PAGE>
 
                                      -2-


market conditions and subject to the conditions set forth below, we are highly
confident of our ability to sell or place the Notes and arrange the Bank Debt,
in each case in connection with the Transaction. The structure, covenants and
terms of the Acquisition Financing will be as determined by BTAB in consultation
with you, on terms mutually acceptable to both parties based on market
conditions at the time of the sale or placement and on the structure and
documentation of the Transaction. Our confidence in our ability to consummate
the sale, placement or arrangement of the Acquisition Financing is subject to
(i) there not having occurred any material adverse change in the financial
condition, results of operations, business or prospects of the Acquired Business
since February 28, 1997, (ii) there not existing any pending or threatened
claim, suit or proceeding by any governmental or regulatory authority which BTAB
shall reasonably determine could have a materially adverse effect on the
business, property, assets, liabilities, condition (financial or otherwise) or
prospects of Newco or the Acquired Business, (iii) the receipt of all necessary
governmental, regulatory or third party approvals or consents in connection with
the Transaction, (iv) the execution and delivery of documentation for the
Transaction and related transactions in form and substance reasonably
satisfactory to BTAB and such documentation being in full force and effect, (v)
agreement on the terms of the Notes and negotiation and execution of
satisfactory documentation with respect to the Notes and the offering and sale
thereof, (vi) the terms and structure of the Bank Debt being reasonably
acceptable to BTAB (including but not limited to the availability of working
capital borrowing in a satisfactory amount) and the execution of documentation
relating thereto reasonably satisfactory in form and substance to BTAB, (vii)
BTAB and its representatives shall have completed and be satisfied with the
results of its continuing financial, business, environmental and legal due
diligence, (viii) the receipt and review (to our reasonable satisfaction) of
independent third party reports as to certain matters customarily so reported
upon in transactions of this type, including, without limitation, solvency, (ix)
the availability of audited and unaudited historical and pro forma financial
statements of the Acquired Business, in each case reasonably acceptable to BTAB
and in form and presentation as required by the Securities Act of 1933, as
amended, and the rules and regulations thereunder applicable to registration
statements filed thereunder, (x) no change or proposed change in law having
occurred that could reasonably be expected to adversely affect in a material way
the economic consequences that Newco or its stockholders contemplate deriving
from, or with respect to, the Transaction, (xi) there not having been any
disruption or material adverse 
<PAGE>
 
                                      -3-

change in the market for new issues of high yield securities or the financial or
capital markets in general, in the judgment of BTAB and (xii) BTAB having a
reasonable time to market the Notes and arrange the Bank Debt based on BTAB's
experience in comparable transactions.

          This letter is not intended to be and should not be construed as a
commitment with respect to the underwriting, sale or placement of the
Acquisition Financing.

          Except as otherwise required by law or unless BTAB has otherwise
consented in writing, you are not authorized to show or circulate this letter to
any other person or entity (other than your legal or financial advisors in
connection with your evaluation hereof and the sellers of the Acquired Business
and its legal and financial advisors).  If this letter is not accepted by you by
5:00 p.m. on November 26, 1997 you are to immediately return this letter (and
any copies hereof) to the undersigned.

                                    Very truly yours,


                                    BT ALEX. BROWN INCORPORATED

                                    By:   /s/ Daniel D. McCready
                                       -------------------------
                                       Name:  Daniel D. McCready
                                       Title: Vice President

AGREED TO AND ACCEPTED as of
the date first written above:

WPG CORPORATE DEVELOPMENT ASSOCIATES V, L.P.

BY WPG PRIVATE EQUITY PARTNERS II, L.L.C.,
ITS GENERAL PARTNER


By:   /s/ Steven N. Hutchinson
   ---------------------------
   NAME:  Steven N. Hutchinson
   TITLE: Managing Member

<PAGE>
 
                                                                  EXHIBIT (b)(2)


                             BANKERS TRUST COMPANY
                               130 LIBERTY STREET
                            NEW YORK, NEW YORK 10006



                                                               November 26, 1997


WPG Corporate Development Associates V, L.P.
c/o Weiss, Peck & Greer, L.L.C.
One New York Plaza
New York, New York  10004

Attention:  Steven N. Hutchinson, Principal

re Bank Commitment Letter
- -------------------------


Gentlemen:

          You have advised Bankers Trust Company ("BTCo") that (i) Weiss, Peck &
Greer, L.L.C. ("WPG") is considering a negotiated acquisition pursuant to which
Acquisition Holdings, Inc. ("Holdings"), a company formed by WPG Corporate
Development Associates V, L.P. ("WPG Corporate Development") and other investors
reasonably acceptable to BTCo would acquire, through Acquisition Corp.
("Acquisition Corp."), a newly-formed wholly-owned subsidiary of Holdings, all
of the issued and outstanding shares of common stock (the "Shares") of ATC Group
Services Inc. ("ATC") by way of (x) a cash tender offer for any and all of the
Shares, subject to the minimum tender condition referenced in the summary of
terms below (the "Tender Offer"), and (y) as soon as practicable after the
purchase of the Shares pursuant to the Tender Offer, a merger of Acquisition
Corp. and ATC (the "Merger" and, together with the Tender Offer, the
"Acquisition"), with ATC as the surviving corporation of the Merger, and (ii)
concurrently with the consummation of the Merger, ATC will effect a refinancing
of $42.0 million of existing debt of ATC and its subsidiaries (the
"Refinancing," and together with the Acquisition and the incurrence of the
financing described below, the "Transaction").

          BTCo understands that the purchase price in respect of the Acquisition
will be $104 million (net of cash proceeds received from the exercise of options
and warrants) and that the fees and expenses incurred in connection with the
Transaction will not exceed $10 million. BTCo further understands that the
funding needed to effect the Acquisition and the Refinancing, to pay fees and
expenses owing in connection with

<PAGE>
 
the Transaction and to provide working capital to ATC and its subsidiaries shall
be provided solely as follows: (i) the issuance by Acquisition Corp. of
unsecured senior subordinated notes (the "Senior Subordinated Notes"), which
shall generate $100 million of gross cash proceeds, (ii) an equity contribution
(the "Equity Funds") by WPG Corporate Development and existing management of ATC
consisting of $25 million of new cash common equity by WPG and/or its affiliates
and an equity investment by management of ATC of $2.5 million of common equity
and (iii) the incurrence by ATC of the Senior Secured Financing as defined
below.

          BTCo further understands that the senior bank financing (the "Senior
Secured Financing") will be in the form of (i) a term loan facility (the "Term
Loan Facility") in the amount of $20 million to be made available to ATC on the
date of the consummation of the Merger (the "Closing Date") to effect the
Refinancing and (ii) a revolving credit facility (the "Revolving Credit
Facility", and together with the Term Loan Facility, the "Credit Facilities") in
the amount of $30 million to be made available to ATC from and after the Closing
Date (it being understood that no more than $9 million of the Revolving Credit
Facility may be utilized to make payments owing in connection with the
Refinancing and that no portion of the Revolving Credit Facility may be utilized
to effect the Acquisition), as more fully described below.  BTCo is pleased to
confirm that it is committed to provide, on, and subject to, the terms and
conditions set forth herein, all of the Senior Secured Financing.  If BTCo
discovers information not previously known to it which BTCo reasonably believes
is materially negative information with respect to the Transaction or the
condition (financial or otherwise), business, operations, assets, liabilities or
prospects of Holdings, Acquisition Corp., ATC or any of their subsidiaries, BTCo
may, in its sole discretion, suggest alternative financing amounts or structures
that assure adequate protection for it or decline to provide or participate in
the proposed financing.

          BTCo reserves the right, prior to or after execution of the definitive
credit documentation for the Credit Facilities, to syndicate all or part of its
commitment for the Credit Facilities to one or more financial institutions
reasonably acceptable to you (together with BTCo, the "Banks") that will become
parties to such definitive credit documentation pursuant to a syndication to be
managed by BTCo as agent (the "Agent").  Such syndication will be accomplished
by a variety of means, including direct contact during the syndication between
senior management and advisors of WPG, ATC and its subsidiaries and the proposed
syndicate members.  To assist us in our syndication efforts, you hereby agree
(a) to provide to us and the other syndicate members upon request with all
reasonable information reasonably deemed necessary by us to complete
syndication, including, but not limited to, information and evaluations prepared
by WPG, ATC or its subsidiaries or on their behalf relating to the transactions
contemplated hereby and (b) to assist us upon request in the preparation of an
Information Memorandum to be used in connection with the syndication of the
Senior Secured Financing, including making available, upon reasonable advance
notice, the officers of WPG, ATC and its subsidiaries from time to time and to
attend and make presentations regarding the business and prospects of ATC and
its subsidiaries, as 

                                      -2-
<PAGE>
 
appropriate, at a meeting or meetings of Banks or prospective Banks. We will
provide you with a copy of the Information Memorandum for your review prior to
the distribu tion thereof to prospective Banks.

          Certain of the terms of the Credit Facilities are set forth below:

                            SUMMARY OF CERTAIN TERMS
                            ------------------------


I.   DESCRIPTION OF CREDIT FACILITIES
     --------------------------------


     A.   TERM LOAN FACILITY
          ------------------

AMOUNT:          $20 million Term Loan Facility.

MATURITY:        The Term Loan Facility will mature on the fifth anniversary of
                 the Closing Date.                 

AMORTIZATIONS:   The loans under the Term Loan Facility (the "Term Loans") shall
                 amortize quarterly in amounts to be determined.

USE OF PROCEEDS: The Term Loans shall only be utilized (x) to finance the
                 Refinancing and (y) to pay fees and expenses incurred in
                 connection with the Credit Facilities.

AVAILABILITY:    Term Loans may only be incurred on the Closing Date.  No amount
                 of Term Loans once repaid may be reborrowed.


B.  Revolving Credit Facility
    -------------------------

AMOUNT:          $30 million Revolving Credit Facility, with a letter of credit
                 sublimit to be agreed upon for the issuance of standby
                 letters of credit (the "Letters of Credit").

MATURITY:        The final maturity of the Revolving Credit Facility shall be
                 five years from the Closing Date, with all of the loans made
                 pursuant to the Revolving Credit Facility (the "Revolving
                 Loans", and together with the Term Loans, the "Loans") to be
                 repaid as a bullet on such date and all Letters of Credit to
                 terminate by such date.

                                      -3-
<PAGE>
 
USE OF PROCEEDS: Revolving Loans shall be utilized for the Borrower's and its
                 subsidiaries' working capital and general corporate purposes
                 (including permitted acquisitions), provided that up to $9
                 million of Revolving Loans may be used to finance the
                 Refinancing and to pay fees and expenses incurred in
                 connection with the Credit Facilities.

AVAILABILITY:    Revolving Loans may be borrowed, repaid and reborrowed on or
                 after the Closing Date.


II.  TERMS APPLICABLE TO THE ENTIRE SENIOR SECURED FINANCING
     -------------------------------------------------------

AGENT:           Bankers Trust Company ("BTCo").

LENDERS:         BTCo and/or a syndicate of lenders formed by BTCo and
                 reasonably acceptable to the Borrower (the "Banks").

BORROWER:        ATC.

GUARANTIES:      Holdings and each direct and indirect subsidiary of the
                 Borrower (each a "Guarantor") shall be required to pro vide
                 unconditional guaranties of all amounts owing under the Credit
                 Facilities (the "Guaranties").

SECURITY:        The Credit Facilities (and all obligations under the
                 Guaranties) will be secured by (i) a first priority perfected
                 pledge of (x) all notes owned by the Borrower and the
                 Guarantors and (y) all capital stock owned by the Borrower and
                 the Guarantors (excluding all Shares purchased pursuant to the
                 Tender Offer, it being understood, however, that all shares of
                 capital stock of the Borrower shall be required to be pledged
                 only from and after the consummation of the Merger) and (ii) a
                 first priority perfected security interest in all other assets
                 (including receivables, contracts, contract rights, securities,
                 inventory, equipment, real estate, copyrights, patents and
                 trademarks) owned by the Borrower and the Guarantors, subject
                 to (i) customary exceptions for transactions of this type, (ii)
                 the existing junior and subordinated security interest in favor
                 of American Testing and Engineering Corporation and (iii) such
                 other exceptions as are reasonably acceptable to BTCo.

INTEREST RATES:  At the Borrower's option, Loans may be maintained from 

                                      -4-
<PAGE>
 
                 time to time as (x) Base Rate Loans which shall bear interest
                 at the Applicable Margin plus the Base Rate in effect from time
                 to time or (y) Reserve Adjusted Eurodollar Loans which shall
                 bear interest at the Applicable Margin plus the Eurodollar Rate
                 (adjusted for maximum reserves) as determined by the Agent for
                 the respective interest period.

                 "Base Rate" shall mean the higher of (x) the rate that BTCo
                 announces from time to time as its prime lending rate, as in
                 effect from time to time and (y) 1/2 of 1% in excess of the
                 overnight federal funds rate.

                 "Applicable Margin" shall mean a percentage per annum equal to
                 (i) in the case of Base Rate Loans, 1.25% and (ii) in the case
                 of Reserve Adjusted Eurodollar Loans, 2.25%. The Applicable
                 Margin shall be adjusted on a quarterly basis based on a
                 leverage formula to be agreed upon.

                 Interest periods of 1, 2, 3 and 6 months shall be available
                 in the case of Reserve Adjusted Eurodollar Loans.

                 The Credit Facilities shall include customary protective
                 provisions for such matters as defaulting banks, capital
                 adequacy, increased costs, funding losses, illegality and
                 withholding taxes. Interest in respect of Base Rate Loans shall
                 be payable quarterly in arrears on the last business day of
                 each quarter. Interest in respect of Reserve Adjusted
                 Eurodollar Loans shall be payable in arrears at the end of the
                 applicable interest period and every three months in the case
                 of interest periods in excess of three months. Interest will
                 also be payable at the time of repayment of any Loans and at
                 maturity. All interest and commitment fees and other fee
                 calculations shall be based on a 360-day year and actual days
                 elapsed, provided that interest on Base Rate Loans shall be
                 calculated on a 365/366 day year and actual days elapsed.

                 Overdue principal, interest and other overdue amounts shall
                 bear interest at a rate per annum equal to the greater of (i)
                 the rate which is 2% in excess of the rate otherwise applicable
                 to Base Rate Loans from time to time and (ii) the rate which is
                 2% in excess of the rate then borne by such borrowings. Such
                 interest shall be payable on demand.

                                      -5-
<PAGE>
 
VOLUNTARY
PREPAYMENTS AND
COMMITMENT 
REDUCTIONS:         Voluntary prepayments of Loans under the Credit
                    Facilities, and voluntary reductions to the unutilized por
                    tion of the Revolving Credit Facility, may be made by the
                    Borrower at any time without premium or penalty, provided
                    that voluntary prepayments of Reserve Adjusted Eurodollar
                    Loans made on any day other than the last day of an interest
                    period applicable thereto shall be accompanied by customary
                    breakage costs.

MANDATORY REPAYMENTS
AND COMMITMENT REDUC-
TIONS:              Mandatory repayments of Term Loans (and after all Term
                    Loans have been repaid in full, mandatory commitment
                    reductions to the Revolving Credit Facility) shall be
                    required with (i) 100% of the net proceeds from asset
                    dispositions, (ii) 100% of the net proceeds of issuances of
                    indebtedness, (iii) 100% of the net proceeds from insurance
                    recovery and condemnation events, (iv) 50% of the net
                    proceeds from equity issuances and capital contributions and
                    (v) 75% of annual excess cash flow in respect of the first
                    year of the Credit Facilities and 50% of annual excess cash
                    flow for each year thereafter, in each case with customary
                    exceptions to be agreed upon.  In addition, Revolving Loans
                    shall be required to be prepaid (and Letters of Credit cash
                    collateralized) if at any time the aggregate principal
                    amount thereof exceeds the total Revolving Credit Facility
                    commitments, with such prepayment (and/or cash
                    collateralization) to be in an amount equal to such excess.

                    All voluntary and mandatory prepayments and repayments of
                    Term Loans will be applied to reduce future scheduled
                    amortization payments on a pro rata basis (after giving
                                               --- ----                    
                    effect to all prior reductions thereto).

AGENT/LENDER FEES:  The Agent and the Banks shall receive such fees as have
                    been separately agreed upon with the Borrower.

COMMITMENT FEES:    1/2 of 1% per annum of the unutilized total commitment
                    under the Revolving Credit Facility, as in effect from time
                    to time, commencing on the Closing Date to and including the
                    termination of the Revolving Credit Facility and 

                                      -6-
<PAGE>
 
                    payable quarterly in arrears and upon the termination of the
                    Revolving Credit Facility; provided that such commitment fee
                                               --------
                    may be adjusted on a quarterly basis based on a leverage
                    formula to be agreed upon.

LETTER OF CREDIT 
FEES:               Applicable Margin for Loans maintained as Reserve
                    Adjusted Eurodollar Loans on the outstanding stated amounts
                    of Letters of Credit, plus a facing fee for the account of
                    the letter of credit issuer of  1/4 of 1% on such
                    outstanding stated amounts.

ASSIGNMENTS AND
PARTICIPATIONS:     The Borrower may not assign its rights or obligations under
                    the Credit Facilities without the prior written consent of
                    the Banks. Any Bank may assign, and may sell participations
                    in, its rights and obligations under the Credit Facilities,
                    subject (x) in the case of participations, to customary
                    restrictions on voting rights of the participants and (y) in
                    the case of assignments, to such limitations as may be
                    established by BTCo, including the consent of the Agent and,
                    so long as no payment or bankruptcy default then exists, and
                    no event of default then exists, in each case under the
                    Credit Facilities, the consent of the Borrower (each of
                    which consents shall not be unreasonably withheld or
                    delayed).


COMMITMENT TERMINA-
TION:               All commitments under the Credit Facilities shall terminate
                    on February 28, 1998 unless (i) definitive documents for the
                    Credit Facilities have been executed and delivered and (ii)
                    the Transaction has been consummated.

                    In addition, unless otherwise consented to by the Banks
                    holding a majority of the Revolving Credit Facility
                    commitments and outstanding Term  Loans (the "Required
                    Banks"), all Loans shall be required to be repaid in full,
                    and all commitments under the Revolving Credit Facility
                    shall terminate, upon the occurrence of a change of control
                    of Holdings, Acquisition Corp. or the Borrower (to be
                    defined in a manner satisfactory to BTCo).

DOCUMENTATION:      The Banks' commitments for the Senior Secured Financing will
                    be subject to the negotiation, execution and delivery of
                    definitive financing agreements (and related security
                    documentation, Guaranties, etc.) consistent with

                                      -7-
<PAGE>
 
                    the terms of this letter, in each case prepared by White &
                    Case. All documentation (except security documentation that
                    BTCo determines should be governed by local law) shall be
                    governed by New York law.

CONDITIONS 
PRECEDENT:          In addition to conditions precedent typical for these
                    types of credit facilities and any other conditions
                    appropriate in the context of the proposed transaction, the
                    following conditions precedent shall apply:

A.  TO THE INITIAL LOANS
    --------------------

                 (i)    The Tender Offer and the Merger shall be made as
                        contemplated by the Merger Agreement to be entered into
                        by and between Acquisition Corp. and ATC prior to the
                        Closing Date (the "Merger Agreement")  and all
                        documentation therefor (and the terms thereof) shall be
                        reasonably satisfactory to the Agent and the Required
                        Banks.  All material conditions to the consummation of
                        the Tender Offer and the Merger as provided in the
                        Merger Agree ment and the other documents related
                        thereto shall be satisfied and not waived except with
                        the consent of the Agent and the Required Banks (which
                        consent shall not be unreasonably withheld or delayed).
                        Each State anti-takeover law, if any, regulating the
                        Tender Offer or the Merger shall have been complied with
                        or shall be inapplicable to the Tender Offer and the
                        Merger. At the time of the consummation of the Tender
                        Offer, no fair price provisions nor provisions of ATC's
                        charter shall require a higher price to be paid for each
                        Share in the Merger than in the Tender Offer. ATC
                        shareholders rights program, if any, shall have been
                        revoked or shall be inapplicable to the Tender Offer and
                        the Merger. Each component of the Transaction shall have
                        been consummated in all material respects in accordance
                        with the documentation therefor and all applicable law.

                 (ii)   Holdings shall have received gross cash proceeds of at
                        least $27.5 million from the Equity Funds (of which $2.5
                        million may be in the form of rollover equity by
                        existing management of ATC).  The terms and conditions
                        of the capital stock of Holdings and 

                                      -8-
<PAGE>
 
                        Acquisition Corp. issued in connection with the Equity
                        Funds shall be reasonably satisfactory to the Agent and
                        the Required Banks. Additionally, Holdings shall have
                        contributed all of the cash proceeds of the Equity Funds
                        to the capital of Acquisition Corp. in return for 100%
                        of the shares of common stock of Acquisition Corp.

                 (iii)  Acquisition Corp. shall have received gross cash
                        proceeds of $100 million from the issuance of a like
                        principal amount of Senior Subordinated Notes.  The
                        Senior Subordinated Notes shall be unsecured.  All terms
                        and conditions (and the documentation) of the Senior
                        Subordinated Notes (including, without limitation,
                        amortization, maturities, interest rates, covenants,
                        defaults, remedies, sinking fund provi sions,
                        subordination provisions and limitations on cash
                        interest payable) shall be reasonably satisfactory to
                        the Agent and the Required Banks.

                 (iv)   All necessary governmental (domestic and foreign) and
                        third party approvals in connection with the
                        Transaction, the transactions contemplated by the Credit
                        Facilities and otherwise referred to herein shall have
                        been obtained and remain in effect, and all applicable
                        waiting periods shall have expired without any action
                        being taken by any competent authority which restrains,
                        prevents, or imposes materially adverse conditions upon,
                        the consummation of the Transaction or the transactions
                        contemplated by the Credit Facilities. Additionally,
                        there shall not exist any judgment, order, injunction or
                        other restraint prohibiting or imposing materially
                        adverse conditions upon the Transaction or the
                        transactions contemplated by the Credit Facilities.

                 (v)    The Agent shall have received an opinion from an
                        independent valuation firm, in form and substance
                        reasonably acceptable to the Agent and the Required
                        Banks, setting forth the conclusions that, after giving
                        effect to the Transaction and the incurrence of all the
                        financings contemplated herein, Holdings and its
                        subsidiaries, Acquisition Corp. and its subsidiaries and
                        ATC and its subsidiaries, each taken as a whole, are not
                        insolvent and will not be 

                                      -9-
<PAGE>
 
                        rendered insolvent by the indebtedness incurred in
                        connection therewith, and will not be left with
                        unreasonably small capital with which to engage in their
                        businesses and will not have incurred debts beyond their
                        ability to pay such debts as they mature.

                 (vi)   Each of the Guaranties shall have been executed and
                        delivered.  The security agreements required as
                        described under the heading "Security" above, shall have
                        been executed and delivered, and the Banks shall have a
                        first priority perfected security interest in all assets
                        of the Borrower and the Guarantors as required above
                        subject to customary permitted liens and other permitted
                        liens as discussed above.

                 (vii)  After giving effect to the Transaction (including the
                        Refinancing) and the financings incurred in
                        connection therewith, Holdings and its subsidiaries
                        shall have no outstanding indebtedness or preferred
                        stock other than (i) the Senior Secured Financing, (ii)
                        the Senior Subordinated Notes, (iii) up to approximately
                        $6.5 million of seller notes, (iv) up to approximately
                        $2 million of capitalized lease obligations, (v) up to
                        approximately $505,000 of letters of credit, (vi) up to
                        approximately $3.3 million of severance, non-compete and
                        consulting payments payable as part of the Acquisition
                        and (vii) such other indebtedness, if any, as is
                        acceptable to the Agent and the Required Banks.

                 (viii)  No litigation by any entity (private or governmental)
                        shall be pending or threatened with respect to the
                        Transaction or the Credit Facilities or any
                        documentation executed in connection therewith, or which
                        the Agent or the Required Banks shall determine could
                        reasonably be expected to have a materially adverse
                        effect on the Transaction or on the business, property,
                        assets, operations, liabilities, condition (financial or
                        otherwise) or prospects of Holdings, Acquisition Corp.,
                        ATC or ATC and its subsidiaries taken as a whole.

                 (ix)   Nothing shall have occurred (and neither the Agent nor
                        the Banks shall have become aware of any fact 

                                      -10-
<PAGE>
 
                        or event not previously known) which the Agent or the
                        Required Banks shall determine has had, or could
                        reasonably be expected to have, a material adverse
                        effect on the rights or remedies of the Agent or the
                        Banks, or on the ability of Holdings or any of its
                        subsidiaries to perform their obligations to the Agent
                        or the Banks or which has had, or could reasonably be
                        expected to have, a materially adverse effect on the
                        business, property, assets, operations, liabilities,
                        condition (financial or otherwise) or prospects of
                        Holdings, Acquisition Corp., ATC or ATC and its
                        subsidiaries taken as a whole.

                 (x)    There shall not have occurred and be continuing a
                        disruption of, or an adverse change in, financial,
                        banking or capital markets that would have a material
                        adverse effect on the syndication of the Credit
                        Facilities, in each case as determined by the Agent in
                        its reasonable discretion.

                 (xi)   The Agent shall have received customary legal opinions
                        from counsel, and covering matters, reasonably
                        acceptable to the Agent and the Required Banks.

                 (xii)  All Loans and other financing to Holdings and its
                        subsidiaries (including Acquisition Corp. and ATC) shall
                        be in full compliance with all applicable requirements
                        of the margin regulations.

                 (xiii) The Agent and the Banks shall have completed their
                        business, accounting, financial and legal due diligence
                        analysis and review of the Transaction and of Holdings,
                        Acquisition Corp., ATC and their subsidiaries and shall
                        be satisfied with the results thereof.

                 (xiv)  The Agent shall have received, and the Agent and the
                        Required Banks shall be satisfied with, an opening pro
                                                                           ---
                        forma balance sheet and income statement of Holdings and
                        -----                                                   
                        its subsidiaries, after giving effect to the
                        Transaction.  In addition, the Agent and the Required
                        Banks shall be satisfied that, as of the Closing Date,
                        ATC's pro forma consolidated adjusted EBITDA for the
                              --- -----                                     
                        twelve month 

                                      -11-
<PAGE>
 
                        period ending February 28, 1997 is at least
                        $25.0 million (with such pro forma consolidated adjusted
                                                 --- -----                      
                        EBITDA to include any acquisitions consummated by ATC on
                        or prior to the Closing Date).

                 (xv)   All costs, fees, expenses (including, without
                        limitation, legal fees and expenses) and other
                        compensation contemplated hereby payable to the Agent or
                        the Banks shall have been paid to the extent due.


B.  CONDITIONS TO ALL LOANS
    -----------------------

                        Absence of any default or event of default under the
                        Credit Facilities and continued material accuracy of
                        representations and warranties.

REPRESENTATIONS
WARRANTIES:             The Credit Facilities and related documentation shall
                        contain representations and warranties typical for this
                        type of facility, as well as any additional ones
                        appropriate in the context of the proposed transaction.

COVENANTS:              "Special Purpose Company" covenants shall apply at all
                        times to Holdings and, prior to the Merger, Acquisition
                        Corp., and those typical for this type of facility shall
                        apply to ATC and its subsidiaries and any additional
                        covenants appropriate in the context of the proposed
                        transaction. Although the covenants have not yet been
                        specifically determined, we anticipate that the
                        covenants shall in any event include:

                 (i)    Restrictions on other indebtedness.

                 (ii)   Restrictions against mergers, consolidations and
                        acquisitions and dispositions of assets.

                 (iii)  Restrictions on sale-leaseback transactions and lease
                        payments.

                 (iv)   Restrictions on dividends.

                 (v)    Restrictions on voluntary prepayments of other debt and
                        amendments thereto.

                                      -12-
<PAGE>
 
                 (vi)   Restrictions on transactions with affiliates and
                        formation of subsidiaries.

                 (vii)  Restrictions on investments, joint ventures and
                        partnerships.

                 (viii) Restrictions on liens.



                 (ix)   Various financial covenants customary for a transaction
                        of this type.

                 (x)    Adequate insurance coverage.

                 (xi)   ERISA covenants.

                 (xii)  Limitations on capital expenditures.

                 (xiii) Restrictions on material amendments of organization
                        documents.

EVENTS OF
DEFAULT:    Those typical for this type of facility and any additional ones
                 appropriate in the context of the proposed transaction,
                 including, without limitation, a default in the event of a
                 change of control of Holdings, Acquisition Corp. or ATC.


       You hereby agree to pay all reasonable costs and expenses (including the
reasonable fees and expenses of White & Case and local counsel and BTCo's
reasonable out-of-pocket expenses) arising in connection with the preparation,
execution and delivery of this letter and the definitive financing agreements
(and BTCo's due diligence and syndication efforts in connection therewith),
whether or not the Transaction is consummated, the Credit Facilities are made
available or definitive credit documents are executed.  In addition, you hereby
agree to pay when and as due the fees described in the enclosed fee letter (the
"Fee Letter").  You further agree to indemnify and hold harmless each of the
Banks (including in any event BTCo), each affiliate thereof and each director,
officer, employee, agent or representative thereof (each an "indemnified
person") in connection with any losses, claims, damages, liabilities or other
reasonable expenses (whether asserted by you or any third party) to which  such
indemnified persons may become subject, insofar as such losses, claims, damages,
liabilities (or actions or other proceedings commenced or threatened in respect
thereof) or other expenses arise out of or in any way relate to or result from
the Transaction or this letter or the extension of the Senior Secured Financing
contemplated by this letter, or in any way arise from any use or intended use of
this letter or the proceeds of any of the Senior Secured Financing contemplated
by this letter, and you agree to reimburse each 

                                      -13-
<PAGE>
 
indemnified person for any reasonable legal or other expenses incurred in
connection with investigating, defending or participating in any such loss,
claim, damage, liability or action or other proceeding (whether or not such
indemnified person is a party to any action or proceeding out of which
indemnified expenses arise), provided that you shall have no obligation
hereunder to indemnify any indemnified person for any loss, claim, damage,
liability or expense to the extent that same resulted primarily from the gross
negligence or willful misconduct of such indemnified person. This letter is
furnished for your benefit only, and may not be relied upon by any other person
or entity. Neither BTCo nor any of the Banks shall be responsible or liable to
you or any other person for consequential damages which may be alleged as a
result of this letter.

       BTCo reserves the right to employ the services of its affiliates,
including BT Alex. Brown Incorporated ("BTAB"), in providing the services
contemplated by this letter and to allocate, in whole or in part, to such
affiliates (including BTAB) certain fees payable to BTCo in such manner as BTCo
and its affiliates (including BTAB) may agree in their sole discretion.  You
acknowledge that BTCo may share with any of its affiliates (including BTAB), and
such affiliates may share with BTCo, any information relating to Holdings,
Acquisition Corp., ATC or any of their subsidiaries (including, without
limitation, any non-public information regarding the creditworthiness of
Holdings, Acquisition Corp., ATC or any of their subsidiaries) or the
Transaction.  BTCo agrees to treat, and cause any such affiliate to treat, all
non-public information provided to it by you and identified as confidential, as
confidential information in accordance with the terms and conditions of the
confidentiality letter dated November 11, 1997 between BTCo and the Borrower.

       The provisions of the immediately preceding two paragraphs shall survive
any termination of this letter; provided, however, that upon the execution,
delivery and effectiveness of definitive documentation for the Senior Secured
Financing, you shall be released from all obligations under this letter.

       THIS LETTER AND THE FEE LETTER SHALL BE GOVERNED BY, AND CONSTRUED IN
ACCORDANCE WITH, THE LAWS OF THE STATE OF NEW YORK, AND ANY RIGHT TO TRAIL BY
JURY WITH RESPECT TO ANY CLAIM, ACTION, SUIT OR PROCEEDING ARISING OUT OF OR
CONTEMPLATED BY THIS LETTER AND/OR THE FEE LETTER IS HEREBY WAIVED.  THE PARTIES
HERETO HEREBY SUBMIT TO THE NON-EXCLUSIVE JURISDICTION OF THE FEDERAL AND NEW
YORK STATE COURTS LOCATED IN THE CITY OF NEW YORK IN CONNECTION WITH ANY DISPUTE
RELATED TO THIS LETTER AND/OR THE FEE LETTER OR ANY MATTERS CONTEMPLATED HEREBY
OR THEREBY.

       If you are in agreement with the foregoing, please sign and return to
BTCo the enclosed copy of this letter, together with an executed copy of the Fee
Letter.  This offer shall terminate at 5:30 P.M., New York time, on December 1,
1997 unless a signed copy of this letter and the Fee Letter have been delivered
to us (including by way 

                                      -14-
<PAGE>
 
of telecopier) by such time.

                                      -15-
<PAGE>
 
       You are not authorized to show or circulate this letter or to disclose
the terms hereof to any other person or entity (other than to your legal and
financial advisors in connection with your evaluation hereof) without our prior
consent until such time as you have accepted this letter as provided in the
immediately preceding paragraph.  If this letter is not accepted by you as
provided in the immediately preceding paragraph, you are directed to immediately
return this letter (and any copies hereof) to the undersigned.


                              Very truly yours,

                              BANKERS TRUST COMPANY



                              By   /s/ Victoria T. Page
                                -----------------------------
                                Name:  Victoria T. Page
                                Title: Managing Director

Agreed to and Accepted this
26th day of November, 1997.

WPG CORPORATE DEVELOPMENT ASSOCIATES V, L.P.
By:  WPG Private Equity Partners II, L.L.C., its
        general partner



By:   /s/ Steven N. Hutchinson
   ---------------------------
   NAME:  Steven N. Hutchinson
   TITLE: Managing Member

                                      -16-

<PAGE>
 
- --------------------------------------------------------------------------------
- --------------------------------------------------------------------------------
                                                                  EXHIBIT (c)(1)
 
                          AGREEMENT AND PLAN OF MERGER
 
                                     AMONG
 
                          ACQUISITION HOLDINGS, INC.,
 
                               ACQUISITION CORP.
 
                                      AND
 
                            ATC GROUP SERVICES INC.
 
                         DATED AS OF NOVEMBER 26, 1997
 
 
- --------------------------------------------------------------------------------
- --------------------------------------------------------------------------------
<PAGE>
 
                               TABLE OF CONTENTS
 
<TABLE>
<CAPTION>
                                                                          PAGE
                                                                          ----
 <C>            <S>                                                       <C>
 ARTICLE I      THE OFFER...............................................    1
 Section  1.01. The Offer...............................................    1
 Section  1.02. Company Actions.........................................    2
 ARTICLE II     THE MERGER..............................................    4
 Section  2.01. The Merger..............................................    4
 Section  2.02. Closing.................................................    4
 Section  2.03. Effective Time..........................................    4
 Section  2.04. Effects of the Merger...................................    4
 Section  2.05. Certificate of Incorporation and By-laws................    4
 Section  2.06. Directors...............................................    4
 Section  2.07. Officers................................................    4
 ARTICLE III    EFFECT OF THE MERGER ON THE CAPITAL STOCK OF THE
                CONSTITUENT CORPORATIONS; EXCHANGE OF CERTIFICATES......    5
 Section  3.01. Effect on Capital Stock.................................    5
 Section  3.02. Exchange of Certificates................................    5
 ARTICLE IV     REPRESENTATIONS AND WARRANTIES OF THE COMPANY...........    6
 Section  4.01. Organization............................................    7
 Section  4.02. Subsidiaries............................................    7
 Section  4.03. Capitalization..........................................    7
 Section  4.04. Authority...............................................    7
 Section  4.05. Consents and Approvals; No Violations...................    8
 Section  4.06. SEC Reports and Financial Statements....................    8
 Section  4.07. Absence of Certain Changes or Events....................    9
 Section  4.08. No Undisclosed Liabilities..............................    9
 Section  4.09. Information Supplied....................................   10
 Section  4.10. Benefit Plans...........................................   10
 Section  4.11. Other Compensation Arrangements.........................   11
 Section  4.12. Litigation..............................................   11
 Section  4.13. Compliance with Applicable Law..........................   11
 Section  4.14. Tax Matters.............................................   12
 Section  4.15. State Takeover Statutes.................................   13
 Section  4.16. Brokers; Fees and Expenses..............................   13
 Section  4.17. Opinion of Financial Advisor............................   13
 Section  4.18. Intellectual Property...................................   13
 Section  4.19. Labor Relations and Employment..........................   13
 Section  4.20. Change of Control.......................................   14
 Section  4.21. Environmental Matters...................................   14
 Section  4.22. Material Contracts......................................   16
 Section  4.23. Property................................................   16
 Section  4.24. Insurance...............................................   17
 ARTICLE V      REPRESENTATIONS AND WARRANTIES OF PARENT AND SUB........   17
 Section  5.01. Organization............................................   17
 Section  5.02. Authority...............................................   17
 Section  5.03. Consents and Approvals; No Violations...................   17
 Section  5.04. Information Supplied....................................   18
 Section  5.05. Interim Operations of Sub...............................   18
</TABLE>
 
                                       i
<PAGE>
 
<TABLE>
<CAPTION>
                                                                          PAGE
                                                                          ----
 <C>            <S>                                                       <C>
 Section  5.06. Financing...............................................   18
 Section  5.07. Brokers.................................................   18
 ARTICLE VI     COVENANTS...............................................   18
 Section  6.01. Conduct of Business of the Company......................   18
 Section  6.02. No Solicitation.........................................   20
 Section  6.03. Other Actions...........................................   21
 Section  6.04. Notice of Certain Events................................   21
 ARTICLE VII    ADDITIONAL AGREEMENTS...................................   21
 Section  7.01. Stockholder Approval; Preparation of Proxy Statement....   21
 Section  7.02. Access to Information...................................   22
 Section  7.03. Reasonable Efforts; Financing...........................   22
 Section  7.04. Options; Warrants.......................................   22
 Section  7.05. Directors...............................................   24
 Section  7.06. Fees and Expenses.......................................   24
 Section  7.07. Indemnification; Insurance..............................   24
 Section  7.08. Certain Litigation......................................   26
 Section  7.09. Solvency Opinion........................................   26
 ARTICLE VIII   CONDITIONS..............................................   26
                Conditions to Each Party's Obligation To Effect the
 Section  8.01. Merger..................................................   26
 ARTICLE IX     TERMINATION, AMENDMENT AND WAIVER.......................   27
 Section  9.01. Termination.............................................   27
 Section  9.02. Effect of Termination...................................   28
 Section  9.03. Amendment...............................................   28
 Section  9.04. Extension; Waiver.......................................   28
 ARTICLE X      MISCELLANEOUS...........................................   28
 Section 10.01. Nonsurvival of Representations and Warranties...........   28
 Section 10.02. Notices.................................................   28
 Section 10.03. Interpretation..........................................   29
 Section 10.04. Counterparts............................................   30
 Section 10.05. Entire Agreement; Third Party Beneficiaries.............   30
 Section 10.06. Governing Law...........................................   30
 Section 10.07. Publicity...............................................   30
 Section 10.08. Assignment..............................................   30
 Section 10.09. Enforcement.............................................   30
 EXHIBITS
 Exhibit A--Conditions of the Offer......................................  32
</TABLE>
 
                                       ii
<PAGE>
 
  This Agreement and Plan of Merger (this "Agreement") dated as of November
26, 1997, is among ACQUISITION HOLDINGS, INC., a Delaware Corporation
("Parent"), ACQUISITION CORP., a Delaware corporation and a wholly owned
subsidiary of Parent ("Sub"), and ATC GROUP SERVICES INC., a Delaware
corporation (the "Company").
 
  Whereas the respective Boards of Directors of Parent, Sub and the Company
have approved the acquisition of the Company by Parent on the terms and
subject to the conditions set forth in this Agreement;
 
  Whereas, in furtherance of such acquisition, Parent proposes to cause Sub to
make a tender offer (as it may be amended from time to time as permitted under
this Agreement, the "Offer") to purchase all the outstanding shares of Common
Stock, par value $0.01 per share, of the Company (the "Company Common Stock";
all the outstanding shares of Company Common Stock being hereinafter
collectively referred to as the "Shares" and each holder thereof, a "Company
Stockholder") at a purchase price of $12 per share (the "Offer Price"), net to
the seller in cash, without interest thereon, upon the terms and subject to
the conditions set forth in this Agreement; and the Board of Directors of the
Company has adopted resolutions approving the Offer and the Merger (as defined
below), recommending that the Company's stockholders accept the Offer and
approving the acquisition of Shares by Sub pursuant to the Offer;
 
  Whereas the respective Boards of Directors of Parent, Sub and the Company
have each approved the merger of Sub into the Company (the "Merger"), upon the
terms and subject to the conditions set forth in this Agreement, whereby each
share of Company Common Stock, other than shares of Company Common Stock owned
directly or indirectly by Parent or the Company and Dissenting Shares (as
defined in Section 3.01(d)), will be converted into the right to receive the
price per share paid in the Offer; and
 
  Whereas Parent, Sub and the Company desire to make certain representations,
warranties, covenants and agreements in connection with the Offer and the
Merger and also to prescribe various conditions to the Offer and the Merger.
 
  Now, Therefore, in consideration of the foregoing and the mutual covenants
and agreements herein contained, and intending to be legally bound hereby,
Parent, Sub and the Company hereby agree as follows:
 
                                   ARTICLE I
 
                                   The Offer
 
  Section 1.01. The Offer. (a) Subject to the provisions of this Agreement, as
promptly as practicable but in no event later than five business days after
the date of the public announcement by Parent and the Company of the execution
and delivery of this Agreement, Sub shall, and Parent shall cause Sub to,
commence the Offer. The obligation of Sub, and of Parent to cause Sub, to
commence the Offer and accept for payment, and pay for, any Shares tendered
pursuant to the Offer shall be subject to the conditions set forth in Exhibit
A (the "Offer Conditions") and to the terms and conditions of this Agreement;
provided, however, that paragraph (i) of the Offer Conditions shall apply only
to the obligation of Sub, and of Parent to cause Sub, to consummate the Offer.
Sub expressly reserves the right to modify the terms of the Offer, except
that, without the prior written consent of the Company, Sub shall not (i)
reduce the number of Shares subject to the Offer, (ii) reduce the Offer Price,
(iii) add to or modify (other than waive) the Offer Conditions, (iv) except as
provided in the next sentence, extend the Offer, (v) change the form of
consideration payable in the Offer, (vi) amend any other term of or add any
new term to the Offer in any manner materially adverse to the holders of the
Shares or (vii) waive the Minimum Condition (as defined in Exhibit A).
 
  (a) extend the Offer, if at the scheduled or extended expiration date of the
Offer any of the Offer Conditions shall not be satisfied or waived, until such
time as such conditions are satisfied or waived, (b) extend the Offer for any
period required by any rule, regulation, interpretation or position of the
Commission or the staff thereof
 
                                       1
<PAGE>
 
applicable to the Offer, (c) extend the Offer from time to time until two
business days after the expiration of the waiting period under the HSR Act and
(d) extend the Offer for a period not to exceed 15 business days,
notwithstanding that all conditions to the Offer are satisfied as of such
expiration date of the Offer, if, immediately prior to such expiration date
(as it may be extended), the Shares tendered and not withdrawn pursuant to the
Offer equal less than 90% of the outstanding Shares (on a fully diluted
basis). In addition, Sub shall be obligated to extend the Offer, if at the
scheduled expiration date of the Offer any of the Offer Conditions capable of
satisfaction shall not have been satisfied or waived, until the satisfaction
or waiver thereof; provided, however, that there shall be no such obligation
to extend the Offer beyond the 60th business day after the commencement of the
Offer. Subject to the terms and conditions of the Offer and this Agreement,
Sub shall, and Parent shall cause Sub to, accept for payment, and pay for, all
Shares validly tendered and not withdrawn pursuant to the Offer that Sub
becomes obligated to accept for payment, and pay for, pursuant to the Offer
promptly after the expiration of the Offer; provided, however, that in no
event shall the Offer expire prior to January 21, 1998.
 
  (b) Parent and Sub shall file with the SEC a Tender Offer Statement on
Schedule 14D-1 (the "Schedule 14D-1") with respect to the Offer acceptable in
form and substance to the Company and within the time period set forth in
subsection (a) above, which shall contain an offer to purchase and a related
letter of transmittal (the "Letter of Transmittal") and summary advertisement
(such Schedule 14D-1 and the documents included therein pursuant to which the
Offer will be made, together with any supplements or amendments thereto, the
"Offer Documents"). The Offer Documents shall be consistent with this
Agreement, shall add no conditions to the consummation of the Offer not set
forth in Exhibit A and shall add no provisions to the Offer materially adverse
to the Company Stockholders. Parent and Sub agree that the Offer Documents
shall comply as to form in all material respects with the Securities Exchange
Act of 1934, as amended (the "Exchange Act"), and the rules and regulations
promulgated thereunder and the Offer Documents, on the date first published,
sent or given to the Company's stockholders, shall not contain any untrue
statement of a material fact or omit to state any material fact required to be
stated therein or necessary in order to make the statements therein, in light
of the circumstances under which they were made, not misleading, except that
no representation or warranty is made by Parent or Sub with respect to written
information supplied by the Company or any of its stockholders specifically
for inclusion or incorporation by reference in the Offer Documents. Parent,
Sub and the Company each agrees promptly to correct any information provided
by it for use in the Offer Documents if and to the extent that such
information shall have become false or misleading in any material respect, and
Parent and Sub further agree to take all steps necessary to cause the Schedule
14D-1 as so corrected to be filed with the SEC and the other Offer Documents
as so corrected to be disseminated to holders of Shares, in each case as and
to the extent required by applicable securities laws. The Company and its
counsel shall be given reasonable opportunity to review and comment upon the
Offer Documents prior to their filing with the SEC or dissemination to the
stockholders of the Company. Parent and Sub agree to provide the Company and
its counsel any comments Parent, Sub or their counsel may receive from the SEC
or its staff with respect to the Offer Documents promptly after the receipt of
such comments. Parent and Sub shall also provide the Company and its counsel
with copies of all written responses filed by Parent or Sub with the SEC and a
reasonable opportunity to review and comment upon such responses prior to
filing with the SEC.
 
  (c) Parent shall provide or cause to be provided to Sub on a timely basis
the funds necessary to accept for payment, and pay for, all Shares that Sub
becomes obligated to accept for payment, and pay for, pursuant to the Offer.
 
  (d) The Company agrees that neither the Offer nor purchases of Shares
thereunder breach the terms of the Confidentiality Agreement (as defined in
Section 7.02 below).
 
  Section 1.02. Company Actions. (a) The Company hereby approves of and
consents to the Offer and represents that (i) the Board of Directors of the
Company (the "Board"), at a meeting duly called and held, upon recommendation
of a duly constituted special committee (the "Special Committee") of
independent directors, duly adopted resolutions approving this Agreement, the
Offer and the Merger, determining that the terms of the Offer and the Merger
are fair to, adequate and in the best interests of, the Company's stockholders
 
                                       2
<PAGE>
 
and recommending that the Company's stockholders accept the Offer, tender
their Shares pursuant to the Offer and approve and adopt this Agreement, and
(ii) Lehman Brothers Inc. (the "Financial Advisor") has delivered to the Board
its opinion (the "Fairness Opinion") to the effect that, as of the date
thereof and based upon and subject to the matters set forth in such Fairness
Opinion, the consideration to be received by the Company Stockholders in the
Offer and the Merger is fair to the Company Stockholders from a financial
point of view. The Company represents that such approval constitutes approval
of the Offer, this Agreement and the transactions contemplated hereby,
including the Merger, for purposes of Section 203 of the Delaware General
Corporation Law, as amended (the "DGCL"), such that Section 203 of the DGCL
will not apply to the transactions contemplated by this Agreement.
 
  (b) As promptly as practicable after the commencement of the Offer, the
Company shall file with the SEC a Solicitation/Recommendation Statement on
Schedule 14D-9 with respect to the Offer (such Schedule 14D-9, as amended from
time to time, the "Schedule 14D-9") containing the recommendation described in
paragraph (a) and shall mail the Schedule 14D-9 to the stockholders of the
Company. The Company will use its reasonable best efforts to cause the
Schedule 14D-9 to be filed on the same date as Sub's Tender Offer Statement on
Schedule 14D-1 is filed and mailed together with the Offer Documents; provided
that in any event the Schedule 14D-9 shall be filed and mailed no later than
10 business days following the commencement of the Offer. The Schedule 14D-9
shall comply as to form in all material respects with the requirements of the
Exchange Act and the rules and regulations promulgated thereunder and, on the
date filed with the SEC and on the date first published, sent or given to the
Company's stockholders, shall not contain any untrue statement of a material
fact or omit to state any material fact required to be stated therein or
necessary in order to make the statements therein, in light of the
circumstances under which they were made, not misleading, except that no
representation or warranty is made by the Company with respect to information
supplied by Parent or Sub specifically for inclusion in the Schedule 14D-9.
Each of the Company, Parent and Sub agrees promptly to correct any information
provided by it for use in the Schedule 14D-9 if and to the extent that such
information shall have become false or misleading in any material respect, and
the Company further agrees to take all steps necessary to amend or supplement
the Schedule 14D-9 and to cause the Schedule 14D-9 as so amended or
supplemented to be filed with the SEC and disseminated to the Company's
stockholders, in each case as and to the extent required by applicable Federal
securities laws. Parent and its counsel shall be given reasonable opportunity
to review and comment upon the Schedule 14D-9 prior to its filing with the SEC
or dissemination to stockholders of the Company. The Company agrees to provide
Parent and its counsel any comments the Company or its counsel may receive
from the SEC or its staff with respect to the Schedule 14D-9 promptly after
the receipt of such comments.
 
  (c) In connection with the Offer and the Merger, the Company shall furnish
or cause its transfer agent to furnish Sub as promptly as practicable with
mailing labels containing the names and addresses of the record holders of
Shares as of a recent date and of those persons becoming record holders
subsequent to such date, together with copies of all lists of stockholders,
security position listings and computer files and all other information in the
Company's possession or control regarding the beneficial owners of Shares, and
shall furnish to Sub such information and assistance (including updated lists
of stockholders, security position listings and computer files) as Parent may
reasonably request in communicating the Offer to the Company's stockholders.
Subject to the requirements of applicable law, and except for such steps as
are necessary to disseminate the Offer Documents and any other documents
necessary to consummate the Merger, Parent and Sub and their agents shall hold
in confidence the information contained in any such labels, listings and
files, will use such information only in connection with the Offer and the
Merger and, if this Agreement shall be terminated, will, upon request,
deliver, and will use their best efforts to cause their agents to deliver, to
the Company all copies of such information then in their possession or
control.
 
                                       3
<PAGE>
 
                                  ARTICLE II
 
                                  The Merger
 
  Section 2.01. The Merger. Upon the terms and subject to the conditions set
forth in this Agreement, and in accordance with the DGCL, Sub shall be merged
with and into the Company at the Effective Time (as defined in Section 2.03).
Following the Effective Time, the separate corporate existence of Sub shall
cease and the Company shall continue as the surviving corporation (the
"Surviving Corporation") and shall succeed to and assume all the rights and
obligations of Sub in accordance with the DGCL. At the election of Parent, any
direct or indirect wholly owned subsidiary (as defined in Section 10.03) of
Parent may be substituted for Sub as a constituent corporation in the Merger.
In such event, the parties agree to execute an appropriate amendment to this
Agreement in order to reflect the foregoing.
 
  Section 2.02. Closing. The closing of the Merger (the "Closing") will take
place at 10:00 a.m. (New York City time) on a date to be specified by Parent
or Sub, which shall be no later than the second business day after
satisfaction or waiver of the conditions set forth in Article VIII (the
"Closing Date"), at the offices of Chadbourne & Parke LLP, 30 Rockefeller
Plaza, New York, New York 10112, unless another date, time or place is agreed
to in writing by the parties hereto.
 
  Section 2.03. Effective Time. Subject to the provisions of this Agreement,
as soon as practicable on or after the Closing Date, the parties shall file
with the Secretary of State of Delaware a certificate of merger or other
appropriate documents as provided in Section 251 of the DGCL (in any such
case, the "Certificate of Merger") executed in accordance with the relevant
provisions of the DGCL and shall make all other filings or recordings required
under the DGCL. The Merger shall become effective at such time as the
Certificate of Merger is duly filed with the Delaware Secretary of State, or
at such other time as Sub and the Company shall agree should be specified in
the Certificate of Merger (the time the Merger becomes effective being
hereinafter referred to as the "Effective Time").
 
  Section 2.04. Effects of the Merger. The Merger shall have the effects set
forth in Section 259 of the DGCL.
 
  Section 2.05. Certificate of Incorporation and By-laws. (a) The Certificate
of Incorporation of the Company, as in effect immediately prior to the
Effective Time, shall be amended as of the Effective Time so that ARTICLE
FOURTH of such certificate of incorporation reads in its entirety as follows:
"The total number of shares of all classes of stock which the corporation
shall have authority to issue is 10,000 shares of Common Stock, par value $.01
per share" and, as so amended, such certificate of incorporation shall be the
certificate of incorporation of the Surviving Corporation until thereafter
changed or amended as provided therein or by applicable law.
 
  (b) The By-Laws of the Company as in effect immediately prior to the
Effective Time shall be the By-Laws of the Surviving Corporation, until
thereafter changed or amended as provided therein or by applicable law.
 
  Section 2.06. Directors. The directors of Sub immediately prior to the
Effective Time shall be the directors of the Surviving Corporation, until the
earlier of their resignation or removal or until their respective successors
are duly elected and qualified, as the case may be, and the Company shall
procure, prior to and as a condition to the Closing, the resignation of each
of its directors effective as of the Closing.
 
  Section 2.07. Officers. The officers of the Company immediately prior to the
Effective Time shall be the officers of the Surviving Corporation, until the
earlier of their resignation or removal or until their respective successors
are duly elected and qualified, as the case may be.
 
 
                                       4
<PAGE>
 
                                  ARTICLE III
 
   Effect of the Merger on the Capital Stock of theConstituent Corporations;
                           Exchange of Certificates
 
  Section 3.01. Effect on Capital Stock. As of the Effective Time, by virtue
of the Merger and without any action on the part of the holder of any Shares
or any shares of capital stock of Sub:
 
  (a) Capital Stock of Sub. Each issued and outstanding share of capital stock
of Sub shall be converted into and become one fully paid and nonassessable
share of Common Stock, par value $.01 per share, of the Surviving Corporation.
 
  (b) Cancellation of Treasury Stock and Parent Owned Stock. Each share of
Company Common Stock that is owned by the Company or by any subsidiary of the
Company and each Share that is owned by Parent, Sub or any other subsidiary of
Parent shall automatically be canceled and retired and shall cease to exist,
and no consideration shall be delivered in exchange therefor.
 
  (c) Conversion of Company Common Stock. Subject to Section 3.01(d), each
Share issued and outstanding (other than Shares to be canceled in accordance
with Section 3.01(b)) shall be converted into the right to receive from the
Surviving Corporation in cash, without interest, the price paid in the Offer
(the "Merger Consideration"). As of the Effective Time, all such Shares shall
no longer be outstanding and shall automatically be canceled and retired and
shall cease to exist, and each holder of a certificate representing any such
Shares shall cease to have any rights with respect thereto, except the right
to receive the Merger Consideration, without interest.
 
  (d) Shares of Dissenting Stockholders. Notwithstanding anything in this
Agreement to the contrary, any issued and outstanding Shares held by a person
(a "Dissenting Stockholder") who complies with all the provisions of Delaware
law concerning the right of holders of Company Common Stock to dissent from
the Merger and require appraisal of their Shares ("Dissenting Shares") shall
not be converted as described in Section 3.01(c) but shall become the right to
receive such consideration as may be determined to be due to such Dissenting
Stockholder pursuant to the laws of the State of Delaware. If, after the
Effective Time, such Dissenting Stockholder withdraws his demand for appraisal
or fails to perfect or otherwise loses his right of appraisal, in any case
pursuant to the DGCL, his Shares shall be deemed to be converted as of the
Effective Time into the right to receive the Merger Consideration. The Company
shall give Parent (i) prompt notice of any demands for appraisal of Shares
received by the Company and (ii) the opportunity to participate in and direct
all negotiations and proceedings with respect to any such demands. The Company
shall not, without the prior written consent of Parent, make any payment with
respect to, or settle, offer to settle or otherwise negotiate, any such
demands.
 
  (e) Withholding Tax. Parent shall be entitled to deduct and withhold from
the consideration otherwise payable pursuant to this Agreement to any holder
of shares of Common Stock outstanding immediately prior to the Effective Time
such amounts as may be required to be deducted and withheld with respect to
the making of such payment under the Internal Revenue Code of 1986, as amended
(the "Code"), or any provision of state, local or foreign tax law. To the
extent that amounts are so withheld, such withheld amounts shall be treated
for all purposes of this Agreement as having been paid to the holder of the
shares of Common Stock outstanding immediately prior to the Effective Time in
respect of which such deduction and withholding was made.
 
  Section 3.02. Exchange of Certificates.
 
  (a) Paying Agent. Prior to the Effective Time, Parent shall designate a
federally insured bank or trust company with assets of not less than
$1,000,000,000 satisfactory to the Company to act as paying agent in the
Merger (the "Paying Agent"), and, from time to time on, prior to or after the
Effective Time, Parent shall make available, or cause the Surviving
Corporation to make available, to the Paying Agent funds in amounts and at the
times necessary for the payment of the Merger Consideration upon surrender of
certificates representing
 
                                       5
<PAGE>
 
Shares as part of the Merger pursuant to Section 3.01 (it being understood
that any and all interest earned on funds made available to the Paying Agent
pursuant to this Agreement shall be turned over to Parent).
 
  (b) Exchange Procedure. As soon as reasonably practicable after the
Effective Time, the Paying Agent shall mail to each holder of record of a
certificate or certificates which immediately prior to the Effective Time
represented Shares (the "Certificates"), (i) a letter of transmittal in a form
mutually agreed upon by the Parent and Surviving Corporation (which shall
specify that delivery shall be effected, and risk of loss and title to the
Certificates shall pass, only upon delivery of the Certificates to the Paying
Agent and (ii) instructions for use in effecting the surrender of the
Certificates in exchange for the Merger Consideration. Upon surrender of a
Certificate for cancellation to the Paying Agent or to such other agent or
agents as may be appointed by Parent, together with such letter of
transmittal, duly executed, and such other documents as may reasonably be
required by the Paying Agent, Parent or the Surviving Corporation shall pay or
cause to be paid to the holder of such Certificate in exchange therefor the
amount of cash into which the Shares theretofore represented by such
Certificate shall have been converted pursuant to Section 3.01, and the
Certificate so surrendered shall forthwith be canceled. In the event of a
transfer of ownership of Shares that is not registered in the transfer records
of the Company, payment may be made to a person other than the person in whose
name the Certificate so surrendered is registered, if such Certificate shall
be properly endorsed or otherwise be in proper form for transfer and the
person requesting such payment shall pay any transfer or other taxes required
by reason of the payment to a person other than the registered holder of such
Certificate or establish to the satisfaction of the Surviving Corporation that
such tax has been paid or is not applicable. Until surrendered as contemplated
by this Section 3.02, each Certificate shall be deemed at any time after the
Effective Time to represent only the right to receive upon such surrender the
amount of cash, without interest, into which the Shares theretofore
represented by such Certificate shall have been converted pursuant to Section
3.01. No interest will be paid or will accrue on the cash payable upon the
surrender of any Certificate.
 
  (c) No Further Ownership Rights in Company Common Stock. All cash paid upon
the surrender of Certificates in accordance with the terms of this Article III
shall be deemed to have been paid in full satisfaction of all rights
pertaining to the Shares theretofore represented by such Certificates. At the
Effective Time, the stock transfer books of the Company shall be closed, and
there shall be no further registration of transfers on the stock transfer
books of the Surviving Corporation of the Shares that were outstanding
immediately prior to the Effective Time. If, after the Effective Time,
Certificates are presented to the Surviving Corporation or the Paying Agent
for any reason, they shall be canceled and exchanged as provided in this
Article III.
 
  (d) Termination of Fund; No Liability. At any time following six months
after the Effective Time, the Surviving Corporation shall be entitled to
require the Paying Agent to deliver to it any funds (including any interest
received with respect thereto) which had been made available to the Paying
Agent and which have not been disbursed to holders of Certificates, and
thereafter such holders shall be entitled to look to the Surviving Corporation
(subject to abandoned property, escheat or other similar laws) only as general
creditors thereof with respect to the Merger Consideration payable upon due
surrender of their Certificates, without any interest thereon. Notwithstanding
the foregoing, neither the Surviving Corporation nor the Paying Agent shall be
liable to any holder of a Certificate for Merger Consideration delivered to a
public official pursuant to any applicable abandoned property, escheat or
similar law.
 
                                  ARTICLE IV
 
                 Representations and Warranties of the Company
 
  Except as set forth in the schedules delivered to Parent in connection with
the execution of this Agreement setting forth exceptions to the Company's
representations and warranties set forth herein (the "Company Disclosure
Schedules"), the Company represents and warrants to Parent and Sub as set
forth below. The Company Disclosure Schedules will be arranged in sections
corresponding to sections of this Agreement to be modified by such disclosure
schedule. As used in this Agreement, "knowledge" means with respect to matters
 
                                       6
<PAGE>
 
relating to the Company, actual knowledge of any executive officer of the
Company or any individual in an equivalent position of the Company, or, in the
reasonable exercise of duty in the ordinary course of business of any such
officer, reason to know.
 
  Section 4.01. Organization. The Company and each of its subsidiaries is a
corporation duly organized, validly existing and in good standing under the
laws of the jurisdiction of its incorporation and has all requisite corporate
power and authority to carry on its business as now being conducted, except
where the failure to be so organized, existing and in good standing or to have
such power and authority would not have a material adverse effect (as defined
in Section 10.03) on the Company. The Company and each of its subsidiaries is
duly qualified or licensed to do business and in good standing in each
jurisdiction in which the property owned, leased or operated by it or the
nature of the business conducted by it makes such qualification or licensing
necessary, except in such jurisdictions where the failure to be so duly
qualified or licensed and in good standing would not have a material adverse
effect on the Company or prevent or materially delay the consummation of the
Offer and/or the Merger. The Company has made available to Parent complete and
correct copies of its Certificate of Incorporation and By-laws and the
certificates of incorporation and By-Laws (or similar organizational
documents) of its subsidiaries.
 
  Section 4.02. Subsidiaries. The subsidiaries of the Company are as set forth
on Schedule 4.02. All the outstanding shares of capital stock of each such
subsidiary, other than director qualifying shares of foreign subsidiaries, are
owned by the Company, by another wholly owned subsidiary of the Company or by
the Company and another wholly owned subsidiary of the Company, free and clear
of all pledges, claims, liens, charges, encumbrances and security interests of
any kind or nature whatsoever (collectively, "Liens"), except for immaterial
Liens on outstanding shares of capital stock of foreign subsidiaries of the
Company, and are duly authorized, validly issued, fully paid and
nonassessable. Except for the capital stock of its subsidiaries, the Company
does not own, directly or indirectly, any capital stock or other ownership
interest in any corporation, partnership, joint venture or other entity.
 
  Section 4.03. Capitalization. The authorized capital stock of the Company
consists of 20,000,000 shares of Company Common Stock. At the close of
business on November 12, 1997, (i) 7,930,107 shares of Company Common Stock
were issued and outstanding, (ii) no shares of Company Common Stock were held
by the Company in its treasury, (iii) except as set forth on Schedule 4.03,
750,070 shares of Company Common Stock were reserved for issuance upon
exercise of outstanding Options (as defined in Section 7.04) and (iv)
1,090,407 shares of Company Common Stock were reserved for issuance upon the
exercise of certain outstanding warrants. Except as set forth above and except
for Shares issued upon the exercise of Options or warrants, as of the date of
this Agreement, no shares of capital stock or other voting securities of the
Company were issued, reserved for issuance or outstanding. All outstanding
shares of capital stock of the Company are, and all shares which may be issued
will be, when issued, duly authorized, validly issued, fully paid and
nonassessable and not subject to preemptive rights. There are no bonds,
debentures, notes or other indebtedness of the Company having the right to
vote (or convertible into, or exchangeable for, securities having the right to
vote) on any matters on which stockholders of the Company may vote. Except as
set forth above, and except for obligations to grant options, subject to the
approval of the Board of Directors of the Company, as of the date of this
Agreement, there are no securities, options, warrants, calls, rights,
commitments, agreements, arrangements or undertakings of any kind to which the
Company or any of its subsidiaries is a party or by which any of them is bound
obligating the Company or any of its subsidiaries to issue, deliver or sell,
or cause to be issued, delivered or sold, additional shares of capital stock
or other voting securities of the Company or of any of its subsidiaries or
obligating the Company or any of its subsidiaries to issue, grant, extend or
enter into any such security, option, warrant, call, right, commitment,
agreement, arrangement or undertaking. As of the date of this Agreement, there
are not any outstanding contractual obligations (i) of the Company or any of
its subsidiaries to repurchase, redeem or otherwise acquire any shares of
capital stock of the Company or (ii) of the Company to vote or to dispose of
any shares of the capital stock of any of its subsidiaries.
 
  Section 4.04. Authority. The Company has the requisite corporate power and
authority to execute and deliver this Agreement and to consummate the
transactions contemplated hereby (other than, with respect to the
 
                                       7
<PAGE>
 
Merger, the approval and adoption of the terms of this Agreement by the
holders of a majority of the Shares (the "Company Stockholder Approval")). The
execution, delivery and performance of this Agreement and the consummation by
the Company of the Merger and of the other transactions contemplated hereby
have been duly authorized by all necessary corporate action on the part of the
Company and no other corporate proceedings on the part of the Company are
necessary to authorize this Agreement or to consummate the transactions so
contemplated (in each case, other than, with respect to the Merger, the
Company Stockholder Approval). This Agreement has been duly executed and
delivered by the Company and, assuming this Agreement constitutes a valid and
binding obligation of Parent and Sub, constitutes a valid and binding
obligation of the Company enforceable against the Company in accordance with
its terms, except (i) as limited by applicable bankruptcy, insolvency,
reorganization, moratorium and other laws of general application affecting
enforcement of creditors' rights generally and (ii) as limited by laws
relating to the availability of specific performance, injunctive relief or
other equitable remedies.
 
  Section 4.05. Consents and Approvals; No Violations. Except for filings,
permits, authorizations, consents and approvals as may be required under, and
other applicable requirements of, the Exchange Act (including the filing with
the SEC of the Schedule 14D-9 and a proxy statement relating to any required
approval by the Company's stockholders of this Agreement (the "Proxy
Statement")), the Hart-Scott-Rodino Antitrust Improvements Act of 1976, as
amended (the "HSR Act"), Section 203 of the DGCL and the laws of other states
in which the Company is qualified to do or is doing business, state takeover
laws and foreign laws, neither the execution, delivery or performance of this
Agreement by the Company nor the consummation by the Company of the
transactions contemplated hereby will (i) conflict with or result in any
breach of any provision of the Certificate of Incorporation or By-laws of the
Company or of the similar organizational documents of any of its subsidiaries,
(ii) require any filing with, or permit, authorization, consent or approval
of, any Federal, state or local government or any court, tribunal,
administrative agency or commission or other governmental or other regulatory
authority or agency, domestic, foreign or supranational (a "Governmental
Entity") (except where the failure to obtain such permits, authorizations,
consents or approvals or to make such filings would not have a material
adverse effect on the Company or prevent or materially delay the consummation
of the Offer and/or the Merger), (iii) except as set forth on Schedule 4.05,
result in a violation or breach of, or constitute (with or without due notice
or lapse of time or both) a default (or give rise to any right of termination,
amendment, cancellation or acceleration) under, any of the terms, conditions
or provisions of any note, bond, mortgage, indenture, lease, license,
contract, agreement or other instrument or obligation to which the Company or
any of its subsidiaries is a party or by which any of them or any of their
properties or assets may be bound; provided, however, that certain contracts
and agreements, the material ones of which have been made available to Parent
by the Company, (A) provide for their termination or require consent upon a
change of control of the Company or (B) contain provisions restricting their
assignment pursuant to a merger, or (iv) violate any order, writ, injunction,
decree, statute, rule or regulation applicable to the Company, any of its
subsidiaries or any of their properties or assets, except in the case of
clauses (iii) or (iv) for violations, breaches or defaults that would not have
a material adverse effect on the Company or prevent or materially delay the
consummation of the Offer and/or the Merger.
 
  Section 4.06. SEC Reports and Financial Statements. The Company has filed
with the SEC, and has heretofore made available to Parent true and complete
copies of, all forms, reports, schedules, statements and other documents
required to be filed by it since December 31, 1994, under the Exchange Act or
the Securities Act of 1933, as amended (the "Securities Act") (such forms,
reports, schedules, statements and other documents, including any financial
statements or schedules included therein, are referred to as the "Company SEC
Documents"). The Company SEC Documents, at the time filed, (a) did not contain
any untrue statement of a material fact or omit to state a material fact
required to be stated therein or necessary in order to make the statements
therein, in light of the circumstances under which they were made, not
misleading and (b) complied in all material respects with the applicable
requirements of the Exchange Act and the Securities Act, as the case may be,
and the applicable rules and regulations of the SEC thereunder. Except to the
extent revised or superseded by a subsequently filed Company Filed SEC
Document (as defined in Section 4.07) (a copy of which has been made available
to Parent prior to the date hereof), the Company SEC Documents, considered as
a whole as of their date, do not contain an untrue statement of a material
fact or omit to state a material fact required to
 
                                       8
<PAGE>
 
be stated or incorporated by reference therein or necessary in order to make
the statements therein, in light of the circumstances under which they were
made, not misleading (it being understood that the foregoing does not cover
future events resulting from public announcement of the Offer and the Merger).
The financial statements of the Company included in the Company SEC Documents
comply as to form in all material respects with applicable accounting
requirements and with the published rules and regulations of the SEC with
respect thereto, have been prepared in accordance with generally accepted
accounting principles applied on a consistent basis during the periods
involved (except as may be indicated in the notes thereto or, in the case of
the unaudited statements, as permitted by Forms 10-Q and 8-K of the SEC) and
fairly present (subject, in the case of the unaudited statements, to normal,
recurring audit adjustments) the consolidated financial position of the
Company and its consolidated subsidiaries as at the dates thereof and the
consolidated results of their operations and cash flows for the periods then
ended.
 
  Section 4.07. Absence of Certain Changes or Events. Except as disclosed in
the Company SEC Documents filed and publicly available prior to the date of
this Agreement (the "Company Filed SEC Documents"), and except as disclosed in
the Company's financial statements dated as of February 28, 1997 audited by
Deloitte & Touche LLP (the "Company Fiscal Year 1997 Financial Statements") (a
copy of which has been made available to Parent by the Company), and except as
disclosed on Schedule 4.07, since February 28, 1997, the Company and its
subsidiaries have conducted their respective businesses only in the ordinary
course, and there has not been any material adverse change (as defined in
Section 10.03) with respect to the Company. Except as disclosed in the Company
Filed SEC Documents or the Company Fiscal Year 1997 Financial Statements, and
except as disclosed on Schedule 4.07, since February 28, 1997, there has not
been (i) any declaration, setting aside or payment of any dividend or other
distribution with respect to its capital stock or any redemption, purchase or
other acquisition of any of its capital stock, (ii) any split, combination or
reclassification of any of its capital stock or any issuance or the
authorization of any issuance of any other securities in respect of, in lieu
of or in substitution for shares of its capital stock, (iii) (w) any granting
by the Company or any of its subsidiaries to any officer of the Company or any
of its subsidiaries of any increase in compensation, except in the ordinary
course of business (including in connection with promotions) consistent with
past practice, (x) any granting by the Company or any of its subsidiaries to
any such officer of any increase in severance or termination pay, except as
part of a standard employment package to any person promoted or hired (but not
including the five most senior officers) (y) except employment arrangements in
the ordinary course of business consistent with past practice with employees
other than any executive officer of the Company, any entry by the Company or
any of its subsidiaries into any employment, severance or termination
agreement with any such employee or executive officer or (z) any increase in
or establishment of any bonus, insurance, deferred compensation, pension,
retirement, profit-sharing, stock option (including the granting of stock
options, stock appreciation rights, performance awards or restricted stock
awards or the amendment of any existing stock options, stock appreciation
rights, performance awards or restricted stock awards), stock purchase or
other employee benefit plan or agreement or arrangement, except in the
ordinary course of business consistent with past practice, (iv) any damage,
destruction or loss, whether or not covered by insurance, that has or
reasonably could be expected to have a material adverse effect on the Company,
(v) any material payment to an affiliate of the Company or any of its
subsidiaries other than in the ordinary course of business consistent with
past practice, (vi) any revaluation by the Company of any of its material
assets, (vii) mortgage, lien, pledge, encumbrance, charge, agreement, claim or
restriction placed upon any of the material properties or assets of the
Company or any of its subsidiaries, (viii) any material change in accounting
methods, principles or practices by the Company or (ix) (A) any licensing or
other agreement with regard to the acquisition or disposition of any material
Intellectual Property Right (as defined in Section 4.18) or rights thereto
other than licenses or other agreements in the ordinary course of business
consistent with past practice or (B) any amendment or consent with respect to
any licensing agreement filed, or required to be filed, by the Company with
the SEC.
 
  Section 4.08. No Undisclosed Liabilities. Except as set forth on Schedule
4.08 and except as and to the extent set forth in the Company Fiscal Year 1997
Financial Statements, as of February 28, 1997, and as disclosed in Company
Filed SEC Documents, neither the Company nor any of its subsidiaries had any
liabilities or obligations of any nature, whether or not accrued, contingent
or otherwise, that would be required by generally
 
                                       9
<PAGE>
 
accepted accounting principles to be reflected on a consolidated balance sheet
of the Company and its subsidiaries (including the notes thereto). Since
February 28, 1997, except as and to the extent set forth in the Company Filed
SEC Documents and Schedule 4.08, neither the Company nor any of its
subsidiaries has incurred any liabilities of any nature, whether or not
accrued, contingent or otherwise, that would have a material adverse effect on
the Company. The consolidated indebtedness on the date hereof of the Company
and its subsidiaries is as set forth on Schedule 4.08.
 
  Section 4.09. Information Supplied. None of the written information supplied
or to be supplied by the Company specifically for inclusion or incorporation
by reference in (i) the Offer Documents, (ii) the Schedule 14D-9, (iii) the
information to be filed by the Company in connection with the Offer pursuant
to Rule 14f-1 promulgated under the Exchange Act (the "Information Statement")
or (iv) the Proxy Statement, will, in the case of the Offer Documents, the
Schedule 14D-9 and the Information Statement, at the respective times the
Offer Documents, the Schedule 14D-9 and the Information Statement are filed
with the SEC or first published, sent or given to the Company's stockholders,
or, in the case of the Proxy Statement, at the time the Proxy Statement is
first mailed to the Company's stockholders or at the time of the Stockholders
Meeting (as defined in Section 7.01), contain any untrue statement of a
material fact or omit to state any material fact required to be stated therein
or necessary in order to make the statements therein, in light of the
circumstances under which they are made, not misleading. The Schedule 14D-9,
the Information Statement and the Proxy Statement will comply as to form in
all material respects with the requirements of the Exchange Act and the rules
and regulations thereunder, except that no representation or warranty is made
by the Company with respect to statements made or incorporated by reference
therein based on information supplied by Parent or Sub specifically for
inclusion or incorporation by reference therein.
 
  Section 4.10. Benefit Plans. (a) Each "employee pension benefit plan" (as
defined in Section 3(2) of the Employee Retirement Income Security Act of
1974, as amended ("ERISA")) (a "Pension Plan"), "employee welfare benefit
plan" (as defined in Section 3(1) of ERISA) (a "Welfare Plan") and each other
plan, pension or welfare arrangement or policy (written or oral) relating to
stock options, stock purchases, compensation, deferred compensation, bonuses,
severance, fringe benefits or other employee benefits, in each case maintained
or contributed to, or required to be maintained or contributed to, by the
Company or its subsidiaries for the benefit of any present or former employee,
officer or director (each of the foregoing, a "Benefit Plan") has been
administered in all material respects in accordance with its terms. The
Company and its subsidiaries and all the Benefit Plans are in compliance in
all material respects with the applicable provisions of ERISA, the Code, and
all other applicable laws.
 
  (b) Schedule 4.10 attached hereto sets forth a complete list of each Benefit
Plan as well as each material employment, termination and severance agreement,
contract, binding arrangement and understanding (whether written or oral) with
employees of the Company and its subsidiaries.
 
  (c) None of the Pension Plans is subject to Title IV of ERISA or Section 412
of the Code and none of the Company or any other person or entity that,
together with the Company, is treated as a single employer under Section 414
(b), (c), (m) or (o) of the Code (each, including the Company, a "Commonly
Controlled Entity"): (i) currently has an obligation to contribute to, or
during any time during the last six years had an obligation to contribute to,
a Pension Plan subject to Title IV of ERISA or Section 412 of the Code, or
(ii) has incurred any liability to the Pension Benefit Guaranty Corporation,
which liability has not been fully paid. All contributions and other payments
required to be made by the Company to any Pension Plan with respect to any
period ending before the Closing Date have been made or reserves adequate for
such contributions or other payments have been or will be set aside therefor
and have been or will be reflected in financial statements.
 
  (d) Neither the Company nor any Commonly Controlled Entity is required to
contribute to any "multiemployer plan" (as defined in Section 4001(a)(3) of
ERISA) or has withdrawn from any multiemployer plan where such withdrawal has
resulted or would result in any "withdrawal liability" (within the meaning of
Section 4201 of ERISA) or "mass withdrawal liability" within the meaning of
PBGC Regulation 4219.2 that has not been fully paid.
 
                                      10
<PAGE>
 
  (e) Each Benefit Plan (and its related trust) that is intended to be
qualified under Sections 401 and 501(a) of the Code has been determined by the
IRS to qualify under such sections and, to the knowledge of the Company,
nothing has occurred to cause the loss of such qualified status.
 
  (f) Each Benefit Plan that is a Welfare Plan may be amended or terminated,
upon thirty (30) days notice, at any time after the Effective Time without
material liability to the Company or its subsidiaries.
 
  (g) Except as set forth in Schedule 4.10, or as required under Section 4980B
of the Code, the Company does not have any obligation to provide post-
retirement health benefits.
 
  (h) The Company has heretofore made available to Parent correct and complete
copies of each of the following:
 
    (1) All written, and descriptions of all binding oral, employment,
  termination and severance agreements, contracts, arrangements and
  understandings listed on Schedule 4.10;
 
    (2) Each Benefit Plan and all amendments thereto; the trust instrument
  and/or insurance contracts, if any, forming a part of such Benefit Plan and
  all amendments thereto;
 
    (3) The most recent IRS Form 5500 and all schedules thereto, if any;
 
    (4) The most recent determination letter issued by the IRS regarding the
  qualified status of each such Pension Plan;
 
    (5) The most recent accountant's report, if any; and
 
    (6) The most recent summary plan description, if any.
 
  Section 4.11. Other Compensation Arrangements. Except as disclosed in the
Company Filed SEC Documents or on Schedule 4.11, or except as provided in this
Agreement, as of the date of this Agreement, neither the Company nor any of
its subsidiaries is a party to any oral or written (i) consulting agreement
not terminable on not more than 60 calendar days notice (except for third
party agreements for the development of, and assignment to, the Company of
Intellectual Property in the ordinary course of business) and involving the
payment of more than $100,000 per annum, (ii) agreement with any executive
officer or other key employee of the Company or any of its subsidiaries (x)
the benefits of which are contingent, or the terms of which are materially
altered, upon the occurrence of a transaction involving the Company of the
nature contemplated by this Agreement or (y) providing any term of employment
or compensation guarantee extending for a period longer than two years or the
payment of more than $100,000 per annum or (iii) agreement or plan, including
any stock option plan, stock appreciation right plan, restricted stock plan or
stock purchase plan, any of the benefits of which will be increased, or the
vesting of the benefits of which will be accelerated, by the occurrence of any
of the transactions contemplated by this Agreement or the value of any of the
benefits of which will be calculated on the basis of any of the transactions
contemplated by this Agreement.
 
  Section 4.12. Litigation. Except as set forth on Schedule 4.12, there is no
suit, claim, action, proceeding or investigation pending before any
Governmental Entity or, to the best knowledge of the Company, threatened
against the Company or any of its subsidiaries that could reasonably be
expected to have a material adverse effect on the Company. Neither the Company
nor any of its subsidiaries is subject to any outstanding order, writ,
injunction or decree that could reasonably be expected to have a material
adverse effect on the Company.
 
  Section 4.13. Compliance with Applicable Law. Except as set forth on
Schedule 4.13, the Company and its subsidiaries hold all permits, licenses,
variances, exemptions, orders and approvals of all Governmental Entities
necessary for the lawful conduct of their respective businesses (the "Company
Permits"), except for failures to hold such permits, licenses, variances,
exemptions, orders and approvals that would not have a material adverse effect
on the Company. Except as set forth on Schedule 4.13, the Company and its
subsidiaries are in compliance with the terms of the Company Permits, except
where the failure so to comply would not have a material adverse effect on the
Company. Except as disclosed in the Company Filed SEC Documents, and except as
set forth on Schedule 4.13, to the best knowledge of the Company, the
businesses of the Company and
 
                                      11
<PAGE>
 
its subsidiaries are not being conducted in violation of any law, ordinance or
regulation of any Governmental Entity, except for possible violations that
would not have a material adverse effect on the Company or prevent or
materially delay the consummation of the Offer and/or the Merger. Except as
set forth on Schedule 4.13, as of the date of this Agreement, no investigation
or review by any Governmental Entity with respect to the Company or any of its
subsidiaries is pending or, to the best knowledge of the Company, threatened,
nor has any Governmental Entity indicated an intention to conduct any such
investigation or review, other than, in each case, those the outcome of which
would not be reasonably expected to have a material adverse effect on the
Company or prevent or materially delay the consummation of the Offer and/or
the Merger.
 
  Section 4.14. Tax Matters. (a) Except as set forth on Schedule 4.14, the
Company and each of its subsidiaries (and any affiliated group of which the
Company or any of its subsidiaries is now or has ever been a member) has
timely filed all Federal income tax returns and all other material tax returns
and reports required to be filed by it. All such returns are complete and
correct in all material respects. Except as set forth on Schedule 4.14, each
of the Company and its subsidiaries (i) has paid (or the Company has paid on
its subsidiaries' behalf) to the appropriate authorities all taxes that are
not immaterial and that are required to be paid by it (without regard to
whether a tax return is required), except taxes for which an adequate reserve
has been established on the financial statements contained in the Company
Filed SEC Documents or the Company Fiscal Year 1997 Financial Statements, and
(ii) has withheld and paid to the appropriate authorities all material
withholding taxes required to be withheld by it. The most recent financial
statements contained in the Company Filed SEC Documents reflect an adequate
reserve (in accordance with generally accepted accounting principles
consistently applied) for all taxes payable by the Company and its
subsidiaries for all taxable periods and portions thereof through the date of
such financial statements.
 
  (b) Except as disclosed in the Company Filed SEC Documents or Schedule 4.14,
no Federal income tax return or other material tax return of the Company or
any of its subsidiaries is under audit or examination by any taxing authority,
and no written or unwritten notice of such an audit or examination has been
received by the Company or any of its subsidiaries. Each material deficiency
resulting from any audit or examination relating to taxes by any taxing
authority has been paid, except for deficiencies being contested in good
faith. No material issues relating to taxes were raised in writing by the
relevant taxing authority in any completed audit or examination that can
reasonably be expected to recur in a later taxable period. The Federal income
tax returns of the Company and each of its subsidiaries do not contain any
positions that could give rise to a material substantial understatement
penalty within the meaning of Section 6662 of the Code.
 
  (c) There is no agreement or other document extending, or having the effect
of extending, the period of assessment or collection of any taxes and no power
of attorney with respect to any taxes has been executed or filed with any
taxing authority.
 
  (d) No material liens for taxes exist with respect to any assets or
properties of the Company or any of its subsidiaries, except for liens for
taxes not yet due.
 
  (e) None of the Company or any of its subsidiaries is a party to or is bound
by any tax sharing agreement, tax indemnity obligation or similar agreement,
arrangement or practice with respect to taxes (including any advance pricing
agreement, closing agreement or other agreement relating to taxes with any
taxing authority).
 
  (f) None of the Company or any of its subsidiaries shall be required to
include in a taxable period ending after the Effective Time taxable income
attributable to income that accrued in a prior taxable period but was not
recognized in any prior taxable period as a result of the installment method
of accounting, the completed contract method of accounting, the long-term
contract method of accounting, the cash method of accounting or Section 481 of
the Code or comparable provisions of state, local or foreign tax law.
 
  (g) Neither the Company nor any of its subsidiaries (i) is a party to a safe
harbor lease within the meaning of Section 168(f)(8) of the Internal Revenue
Code of 1954, as amended and in effect prior to amendment by the Tax Equity
and Fiscal Responsibility Act of 1982, (ii) is a "consenting corporation"
under Section 341(f) of the
 
                                      12
<PAGE>
 
Code, (iii) has agreed or is obligated to make any payments for services which
would not be deductible pursuant to Sections 162(a)(1), 162(m) or 280G of the
Code, (iv) has participated in an international boycott as defined in Section
999 of the Code, (v) is required to make any adjustment under Section 481(a)
of the Code by reason of a change in accounting method or otherwise, (vi) owns
any assets which directly or indirectly secure any debt the interest on which
is tax-exempt under Section 103(a) of the Code, or (vii) owns any asset which
is tax-exempt use property within the meaning of Section 168(h) of the Code.
 
  (h) None of the Company or any of its subsidiaries is a party to any joint
venture, partnership or other arrangement or contract which is treated as a
partnership for tax purposes, or has elected to be treated as a branch or a
partnership pursuant to Treasury Regulation Section 301.7701-3.
 
  (i) Each of the Company and its subsidiaries is a United States person
within the meaning of Section 7701(a)(30) of the Code.
 
  (j) As used in this Agreement, "taxes" shall include all Federal, state,
local and foreign income, property, sales, excise, withholding and other
taxes, tariffs or governmental charges of any nature whatsoever.
 
  Section 4.15. State Takeover Statutes. The Board of Directors of the Company
has approved the Offer, the Merger, this Agreement and the acquisition of
Shares by Sub pursuant to the Offer and such approval is sufficient to render
inapplicable to the Offer, the Merger, this Agreement and the transactions
contemplated by this Agreement the provisions of Section 203 of the DGCL. To
the actual knowledge of the Company without investigation, no other state
takeover statute or similar statute or regulation applies or purports to apply
to the Offer, the Merger, this Agreement, or any of the transactions
contemplated by this Agreement.
 
  Section 4.16. Brokers; Fees and Expenses. No broker, investment banker,
financial advisor or other person, other than Lehman Brothers Inc., the fees
and expenses of which will be paid by the Company, is entitled to any
broker's, finder's, financial advisor's or other similar fee or commission in
connection with the transactions contemplated by this Agreement based upon
arrangements made by or on behalf of the Company. The estimated fees and
expenses incurred and to be incurred by the Company in connection with this
Agreement and the transactions contemplated by this Agreement (including the
fees of the Company's legal counsel, legal counsel for the Special Committee
and the legal counsel for its financial advisor) are set forth in a letter
dated November 26, 1997 from the Company to Parent.
 
  Section 4.17. Opinion of Financial Advisor. The Special Committee has
received the opinion of Lehman Brothers Inc., dated November 26, 1997, to the
effect that, as of that date, the consideration to be received by the holders
of Shares pursuant to the Offer and the Merger is fair to such holders from a
financial point of view, and a complete and correct signed copy of such
opinion has been, or promptly upon receipt thereof will be, delivered to
Parent for inclusion in the Offer Documents.
 
  Section 4.18. Intellectual Property. Except as set forth on Schedule 4.18,
the Company and its subsidiaries own or possess adequate licenses or other
rights to use all Intellectual Property Rights necessary to conduct the
Business, except where failure to own or possess such licenses or rights,
individually or in the aggregate, has not had, and would not have a material
adverse effect on the Company. Except as set forth on Schedule 4.18, to the
knowledge of the Company, the Intellectual Property Rights of the Company and
its subsidiaries do not conflict with or infringe upon any Intellectual
Property Rights of others to the extent that, if sustained, such conflict or
infringement, individually or in the aggregate, would have a material adverse
effect on the Company. For purposes hereof, "Intellectual Property Right"
means any trademark, service mark, trade name, copyright, patent, software
license, other date base, invention, trade secret, know-how (including any
registrations or applications for registration of any of the foregoing) or any
other similar type of proprietary intellectual property right.
 
  Section 4.19. Labor Relations and Employment.
 
  (a) Except as set forth on Schedule 4.19, (i) there is no labor strike,
dispute, slowdown, stoppage or lockout actually pending, or, to the best
knowledge of the Company, threatened against the Company or any of its
 
                                      13
<PAGE>
 
subsidiaries, and during the past three years there has not been any such
action; (ii) no union claims to represent the employees of the Company or any
of its subsidiaries; (iii) neither the Company nor any of its subsidiaries is
a party to or bound by any collective bargaining or similar agreement with any
labor organization, or work rules or practices agreed to with any labor
organization or employee association applicable to employees of the Company or
any of its subsidiaries; (iv) none of the employees of the Company or any of
its subsidiaries is represented by any labor organization and the Company does
not have any knowledge of any current union organizing activities among the
employees of the Company or any of its subsidiaries, nor are there
representation or certification proceedings or petitions seeking a
representation proceeding presently pending or threatened to be brought or
filed with the National Labor Relations Board or any other labor relations
tribunal; (v) the Company and its subsidiaries are, and have at all times
been, in compliance with all applicable laws respecting employment and
employment practices, terms and conditions of employment, wages, hours of work
and occupational safety and health, and are not engaged in any unfair labor
practices as defined in the National Labor Relations Act or other applicable
law, ordinance or regulation except where the failure to be in compliance
would not have a material adverse effect on the Company; (vi) there is no
unfair labor practice charge or complaint against the Company or any of its
subsidiaries pending or, to the knowledge of the Company, threatened before
the National Labor Relations Board or any similar state or foreign agency;
(vii) there is no grievance with respect to or relating to the Company or any
of its subsidiaries arising out of any collective bargaining agreement or
other grievance procedure; (viii) no charges with respect to or relating to
the Company or any of its subsidiaries are pending before the Equal Employment
Opportunity Commission or any other agency responsible for the prevention of
unlawful employment practices; (ix) neither the Company nor any of its
subsidiaries has received notice of the intent of any federal, state, local or
foreign agency responsible for the enforcement of labor or employment laws to
conduct an investigation with respect to or relating to the Company or any of
its subsidiaries and no such investigation is in progress; and (x) there are
no complaints, lawsuits or other proceedings pending or to the knowledge of
the Company threatened in any forum by or on behalf of any present or former
employee of the Company or any of its subsidiaries alleging breach of any
express or implied contract of employment, any law or regulation governing
employment or the termination thereof or other discriminatory, wrongful or
tortious conduct in connection with the employment relationship.
 
  (b) To the knowledge of the Company, since the enactment of the Worker
Adjustment and Retraining Notification ("WARN") Act, there has not been (i) a
"plant closing" (as defined in the WARN Act) affecting any site of employment
or one or more facilities or operating units within any site of employment or
facility of the Company or any of its subsidiaries; or (ii) a "mass layoff"
(as defined in the WARN Act) affecting any site of employment or facility of
the Company or any of its subsidiaries; nor has the Company or any of its
subsidiaries been affected by any transaction or engaged in layoffs or
employment terminations sufficient in number to trigger application of any
similar state or local law. Except as set forth in Schedule 4.19, to the
knowledge of the Company, none of the employees of the Company or any of its
subsidiaries has suffered an "employment loss" (as defined in the WARN Act)
since three months prior to the date of this Agreement.
 
  Section 4.20. Change of Control. Except as set forth on Schedule 4.20, the
transactions contemplated by this Agreement will not constitute a "change of
control" under, require the consent from or the giving of notice to a third
party pursuant to, permit a third party to terminate or accelerate vesting,
repayment or repurchase rights, or create any other detriment under the terms,
conditions or provisions of any note, bond, mortgage, indenture, license,
lease, contract, agreement or other instrument or obligation to which the
Company or any of its subsidiaries is a party or by which any of them or any
of their properties or assets may be bound, except where the adverse
consequences resulting from such change of control or where the failure to
obtain such consents or provide such notices would not, individually or in the
aggregate, have a material adverse effect on the Company.
 
  Section 4.21. Environmental Matters.
 
  (a) Except as set forth on Schedule 4.21, the Company and its subsidiaries
have been and are in compliance with all applicable Environmental Laws (as
this term and the other terms in this section are defined below), except for
such violations and defaults as would not, individually or in the aggregate,
have a material adverse effect on the Company.
 
                                      14
<PAGE>
 
  (b) Except as set forth on Schedule 4.21, the Company and its subsidiaries
possess all required Environmental Permits; all such Environmental Permits are
in full force and effect; there are no pending or threatened proceedings to
revoke such Environmental Permits and the Company and its subsidiaries are in
compliance with all terms and conditions thereof, except where the failure to
possess or comply with such Environmental Permits or the failure for such
Environmental Permits to be in full force and effect would not, individually
or in the aggregate, have a material adverse effect on the Company.
 
  (c) Except as set forth on Schedule 4.21, and except for matters which would
not, individually or in the aggregate, have a material adverse effect on the
Company, neither the Company nor any of its subsidiaries has received any
written notification that the Company or any subsidiary as a result of any of
the current or past operations of the Business, or any property currently or
formerly owned or leased or used in connection with the Business, is or may be
adversely affected by any proceeding, investigation, claim, lawsuit or order
by any Governmental Entity or other person relating to whether (i) any
Remedial Action is or may be needed to respond to a Release or threat of
Release into the environment of Hazardous Substances arising out of or caused
by any current or past operations of the Company or any of its subsidiaries,
(ii) any Environmental Liabilities and Costs imposed by, under or pursuant to
Environmental Laws as in effect on or prior to the date hereof shall be
sought, or proceeding commenced, arising from the current or past operations
of the Business or (iii) the Company or any subsidiary is or may be a
"potentially responsible party" for a Remedial Action, pursuant to any
Environmental Law for the costs of investigating or remediating Releases or
threatened Releases into the environment of Hazardous Substances, whether or
not such Release or threatened Release has occurred or is occurring at
properties currently or formerly owned or operated by the Company and its
subsidiaries;
 
  (d) Except as set forth on Schedule 4.21 and except for Environmental
Permits, none of the Company or its subsidiaries has entered into any written
agreement with any entity of persons including any Governmental Entity by
which the Company or any of its subsidiaries has assumed the responsibility,
either directly or by services rendered or as a guarantor or surety, to pay
for the remediation of any condition arising from or relating to a Release of
Hazardous Substances as defined under Environmental Laws as in effect on or
prior to the date hereof into the environment in connection with the Business,
including for cost recovery by third parties with respect to such Releases or
threatened Releases;
 
  (e) Except as set forth on Schedule 4.21, there is not now and, to the
Company's knowledge, has not been at any time in the past, a Release in
connection with the current or former conduct of the Business of substances
that would constitute Hazardous Substances as regulated under Environmental
Laws as in effect on or prior to the date hereof for which the Company or any
of its subsidiaries is required or is reasonably likely to be required to
perform, at its own expense, or to pay for a Remedial Action pursuant to
Environmental Laws as currently in effect, or will incur Environmental
Liabilities and uncompensated costs that would, individually or in the
aggregate, have a material adverse effect on the Company.
 
  (f) For purposes of hereof:
 
    (i) "Business" means the current and former businesses of the Company and
  its subsidiaries including, but not limited to, businesses or subsidiaries
  that have been previously sold by the Company, its subsidiaries or any
  predecessors thereto.
 
    (ii) "Environmental Laws" means all Laws relating to the protection of
  human health or the environment, or to any emission, discharge, generation,
  processing, storage, holding, abatement, existence, Release, threatened
  Release or transportation of any chemical or substance, including, but not
  limited to, (i) CERCLA, the Resource Conservation and Recovery Act, the
  Clean Water Act, the Clean Air Act, the Toxic Substances Control Act,
  property transfer statutes or requirements and (ii) all other requirements
  pertaining to reporting, licensing, permitting, investigation or
  remediation of Hazardous Substances in the air, surface water, groundwater
  or land, or relating to the manufacture, processing, distribution, use,
  sale, treatment, receipt, storage, disposal, transport or handling of
  Hazardous Substances or relating to human health or safety from exposure to
  Hazardous Substances.
 
 
                                      15
<PAGE>
 
    (iii) "Environmental Liabilities and Costs" means all damages, natural
  resource damages, claims, losses, expenses, costs, obligations, and
  liabilities (collectively, "Losses"), whether direct or indirect, known or
  unknown, current or potential, past, present or future, imposed by, under
  or pursuant to Environmental Laws, including, but not limited to, all
  Losses related to Remedial Actions, and all fees, capital costs,
  disbursements, penalties, fines and expenses of counsel, experts,
  contractors, personnel and consultants and the value of any services that
  might be provided by the Company or any of its subsidiaries in lieu thereof
  and expenditures necessary to cause any such property or the Company or any
  subsidiary to be in compliance with requirements of Environmental Laws.
 
    (iv) "Environmental Permits" means any federal, state, provincial or
  local permit, license, registration, consent, order, administrative consent
  order, certificate, approval or other authorization necessary for the
  conduct of the Business as currently conducted, and wherever it is
  currently conducted, under any applicable Environmental Law.
 
    (v) "Governmental Entity" means any government or subdivision thereof,
  domestic, foreign or supranational or any administrative, governmental or
  regulatory authority, agency, commission, tribunal or body, domestic,
  foreign or supranational.
 
    (vi) "Hazardous Substances" means any substance that (a) is defined,
  listed or identified or otherwise regulated under any Environmental Law
  (including, without limitation, radioactive substances, polycholorinated-
  biphenyls, petroleum and petroleum derivatives and products) or (b)
  requires investigation, removal or remediation under applicable
  Environmental Law.
 
    (vii) "Laws" means all (A) constitutions, treaties, statutes, laws
  (including, but not limited to, the common law), rules, regulations,
  ordinances or codes of any Governmental Entity, (B) Environmental Permits,
  and (C) orders, decisions, injunctions, judgments, awards and decrees of
  any Governmental Entity.
 
    (viii) "Release" means as defined in CERCLA.
 
    (ix) "Remedial Action" means all actions required by any Governmental
  Entity pursuant to Environmental Law or otherwise taken as necessary to
  comply with Environmental Law to (i) clean up, remove, treat or in any
  other way remediate any Hazardous Substances; (ii) prevent the release of
  Hazardous Substances so that they do not migrate or endanger or threaten to
  endanger public health or welfare or the environment; or (iii) perform
  studies, investigations or monitoring in respect of any such matter.
 
  Section 4.22. Material Contracts. (a) The Company has provided or made
available to Parent (i) true and complete copies of all written contracts and
agreements to which the Company or any subsidiary is a party and which are
material to the Company ("Material Contracts"), and (ii) with respect to such
Material Contracts that have not been reduced to writing, a written
description thereof which is listed on Schedule 4.22. Neither the Company nor
any of its subsidiaries is, or has received any notice or has any knowledge
that any other party is, in default in any respect under any such Material
Contract, except for those defaults which would not reasonably be likely,
either individually or in the aggregate, to have a material adverse effect
with respect to the Company; and there has not occurred any event that, with
the lapse of time or the giving of notice or both, would constitute such a
material default.
 
  (b) Except as set forth on Schedule 4.22, no officer or director of the
Company, no shareholder of the Company related to any such officer or
director, and no "associate" (as defined in Rule 14a-1 under the Exchange Act)
of any of them, has any interest in any material contract or agreement of, or
other business arrangement with, the Company, or in any material property
(including any real property and any material personal property, tangible or
intangible), used in or pertaining to the business of the Company.
 
  Section 4.23. Property. Schedule 4.23 accurately identifies all real
property, leases and other rights in real property, structures and other
buildings of the Company and its subsidiaries. All properties and assets of
the Company and its subsidiaries, real and personal, material to the conduct
of their respective businesses are, except for changes in the ordinary course
of business since February 28, 1997, reflected in the balance sheet, and
except as set forth on Schedule 4.23, the Company and its subsidiaries have
good and marketable title to their respective
 
                                      16
<PAGE>
 
real and personal property reflected on the balance sheet or acquired by them
since the date of the balance sheet, free and clear of all mortgages, liens,
pledges, encumbrances, charges, agreements, claims, restrictions and defects
of title. All real property, structures and other buildings and material
equipment of each of the Company and its subsidiaries are currently used in
the operation of the Business, are adequately maintained and are in
satisfactory operating condition and repair for the requirements of the
Business as presently conducted.
 
  Section 4.24. Insurance. Schedule 4.24 accurately identifies each material
insurance policy (including policies providing property, casualty,
environmental liability, liability, malpractice and workers compensation
insurance) and all other material types of insurance maintained by the Company
and its subsidiaries, together with carriers and liability limits for each
such policy. Each such policy is duly in force and no notice has been received
by the Company or any of its subsidiaries from any insurance carrier
purporting to cancel or reduce coverage under any such policy. The Company and
its subsidiaries are current in all premiums or other payments due thereunder
and no notice has been received by the Company or any of its subsidiaries from
any insurance carrier purporting to increase any such premiums in any material
respect. All insurance coverage held for the benefit of the Company or its
subsidiaries is adequate to cover risks customarily insured against by similar
companies in their industry.
 
                                   ARTICLE V
 
               Representations and Warranties of Parent and Sub
 
  Parent and Sub jointly and severally represent and warrant to the Company as
follows:
 
  Section 5.01. Organization. Each of Parent and Sub is a corporation duly
organized, validly existing and in good standing under the laws of the
jurisdiction of its incorporation and has all requisite corporate power and
authority to carry on its business as now being conducted, except where the
failure to be so organized, existing and in good standing or to have such
power and authority would not be reasonably expected to prevent or materially
delay the consummation of the Offer and/or the Merger.
 
  Section 5.02. Authority. Parent and Sub have requisite corporate power and
authority to execute and deliver this Agreement and to consummate the
transactions contemplated hereby. The execution, delivery and performance of
this Agreement and the consummation of the transactions contemplated hereby
have been duly authorized by all necessary corporate action on the part of
Parent and Sub and no other corporate proceedings on the part of Parent and
Sub are necessary to authorize this Agreement or to consummate such
transactions. No vote of Parent shareholders is required to approve this
Agreement or the transactions contemplated hereby. This Agreement has been
duly executed and delivered by Parent and Sub, as the case may be, and,
assuming this Agreement constitutes a valid and binding obligation of the
Company, constitutes a valid and binding obligation of each of Parent and Sub
enforceable against them in accordance with its terms, except (i) as limited
by applicable bankruptcy, insolvency, reorganization, moratorium and other
laws of general application affecting enforcement of creditors' rights
generally and (ii) as limited by laws relating to the availability of specific
performance, injunctive relief or other equitable remedies.
 
  Section 5.03. Consents and Approvals; No Violations. Except for filings,
permits, authorizations, consents and approvals as may be required under, and
other applicable requirements of, the Exchange Act (including the filing with
the SEC of the Offer Documents), the HSR Act, the DGCL, the laws of other
states in which Parent is qualified to do or is doing business, state takeover
laws and foreign laws, neither the execution, delivery or performance of this
Agreement by Parent and Sub nor the consummation by Parent and Sub of the
transactions contemplated hereby will (i) conflict with or result in any
breach of any provision of the respective certificate of incorporation or By-
Laws of Parent and Sub, (ii) require any filing with, or permit,
authorization, consent or approval of, any Governmental Entity (except where
the failure to obtain such permits, authorizations, consents or approvals or
to make such filings would not be reasonably expected to prevent or materially
delay the consummation of the Offer and/or the Merger), (iii) result in a
violation or breach of, or constitute (with or
 
                                      17
<PAGE>
 
without due notice or lapse of time or both) a default (or give rise to any
right of termination, amendment, cancellation or acceleration) under, any of
the terms, conditions or provisions of any note, bond, mortgage, indenture,
license, lease, contract, agreement or other instrument or obligation to which
Parent or any of its subsidiaries is a party or by which any of them or any of
their properties or assets may be bound or (iv) violate any order, writ,
injunction, decree, statute, rule or regulation applicable to Parent, any of
its subsidiaries or any of their properties or assets, except in the case of
clauses (iii) and (iv) for violations, breaches or defaults which would not,
individually or in the aggregate, be reasonably expected to prevent or
materially delay the consummation of the Offer and/or the Merger.
 
  Section 5.04. Information Supplied. None of the information supplied or to
be supplied by Parent or Sub specifically for inclusion or incorporation by
reference in (i) the Offer Documents, (ii) the Schedule 14D-9, (iii) the
Information Statement or (iv) the Proxy Statement will, in the case of the
Offer Documents, the Schedule 14D-9 and the Information Statement, at the
respective times the Offer Documents, the Schedule 14D-9 and the Information
Statement are filed with the SEC or first published, sent or given to the
Company's stockholders, or, in the case of the Proxy Statement, at the time
the Proxy Statement is first mailed to the Company's stockholders or at the
time of the Stockholders Meeting, contain any untrue statement of a material
fact or omit to state any material fact required to be stated therein or
necessary in order to make the statements therein, in light of the
circumstances under which they are made, not misleading. The Offer Documents
will comply as to form in all material respects with the requirements of the
Exchange Act and the rules and regulations thereunder, except that no
representation or warranty is made by Parent or Sub with respect to statements
made or incorporated by reference therein based on information supplied by the
Company specifically for inclusion or incorporation by reference therein.
 
  Section 5.05. Interim Operations of Sub. Sub was formed solely for the
purpose of engaging in the transactions contemplated hereby, has engaged in no
other business activities and has conducted its operations only as
contemplated hereby.
 
  Section 5.06. Financing. The Parent, through its affiliate, WPG Corporate
Development Associates V., L.P., has received a "highly confident" letter from
BT Alex. Brown Incorporated and a letter of commitment from Bankers Trust
Company with respect to the debt financing for the transactions contemplated
hereby (the "Financing Letters"). Executed copies of such letters are attached
hereto as Schedule 5.06. Assuming that the financing contemplated by the
Financing Letters is consummated in accordance with the terms thereof, the
funds to be borrowed and/or provided for thereunder, together with the equity
to be provided by Parent, its affiliates and management, will provide
sufficient funds to pay the Offer Price upon consummation of the Offer, the
Merger Consideration, the refinancing of certain indebtedness for borrowed
money of the Company which is required to be refinanced pursuant to the terms
of such indebtedness in connection with the Offer or the Merger, and all
related fees and expenses. As of the date of this Agreement, Parent is not
aware of any facts or circumstances that create a reasonable basis for Parent
to believe that Parent will not be able to obtain financing in accordance with
the terms of the Financing Letters. Parent agrees promptly to notify the
Company if the statements in the immediately preceding sentence are no longer
true and correct.
 
  Section 5.07. Brokers. None of Parent, Sub, or any of their respective
officers, directors or employees has employed any broker or finder or incurred
any liability for any broker or finder in connection with the transactions
contemplated herein.
 
                                  ARTICLE VI
 
                                   Covenants
 
  Section 6.01. Conduct of Business of the Company. Except as contemplated by
this Agreement or as expressly agreed to in writing by Parent, during the
period from the date of this Agreement until such time as Parent's designees
shall constitute a majority of the members of the Board of Directors of the
Company, the
 
                                      18
<PAGE>
 
Company will, and will cause each of its subsidiaries to, conduct its
operations according to its ordinary and usual course of business and
consistent with past practice and, subject to its obligations under Section
7.04(d), use its and their respective reasonable best efforts to preserve
intact their current business organizations, keep available the services of
their current officers and employees and preserve their relationships with
customers, suppliers, licensors, licensees, advertisers, distributors and
others having business dealings with them and to preserve goodwill. Without
limiting the generality of the foregoing, and except as (x) otherwise
expressly provided in this Agreement, (y) required by law, or (z) set forth on
Schedule 6.01, the Company will not, and will cause its subsidiaries not to,
without the consent of Parent, which shall not be unreasonably withheld:
 
    (i) except with respect to annual bonuses made in the ordinary course of
  business consistent with past practice, adopt or amend in any material
  respect any bonus, profit sharing, compensation, severance, termination,
  stock option, stock appreciation right, pension, retirement, employment or
  other employee benefit agreement, trust, plan or other arrangement for the
  benefit or welfare of any director, officer or employee of the Company or
  any of its subsidiaries or increase in any manner the compensation or
  fringe benefits of any director, officer or employee of the Company or any
  of its subsidiaries (except, in each case, for normal annual salary
  increases and cost of living increases for the benefit of officers and
  employees of the Company with positions below the level of vice president)
  or pay any benefit not required by any existing agreement or place any
  assets in any trust for the benefit of any director, officer or employee of
  the Company or any of its subsidiaries (in each case, except with respect
  to employees and directors in the ordinary course of business consistent
  with past practice);
 
    (ii) incur any indebtedness for borrowed money in excess of $500,000,
  other than in consultation with Parent;
 
    (iii) expend funds for individual capital expenditures in excess of
  $50,000 or $2,000,000 in the aggregate for any 12-month period (to be
  apportioned pro-rata over any period less than 12 months), other than in
  consultation with Parent;
 
    (iv) sell, lease, license, mortgage or otherwise encumber or subject to
  any lien or otherwise dispose of any of its properties or assets other than
  immaterial properties or assets (or immaterial portions of properties or
  assets), except in the ordinary course of business consistent with past
  practice;
 
    (v) (x) declare, set aside or pay any dividends on, or make any other
  distributions in respect of, any of its capital stock, (y) split, combine
  or reclassify any of its capital stock or issue or authorize the issuance
  of any other securities in respect of, in lieu of or in substitution for
  shares of its capital stock or (z) purchase, redeem or otherwise acquire
  any shares of capital stock of the Company or any of its subsidiaries or
  any other securities thereof or any rights, warrants or options to acquire
  any such shares or other securities;
 
    (vi) other than in connection with Options and warrants outstanding as of
  the date hereof, authorize for issuance, issue, deliver, sell or agree or
  commit to issue, sell or deliver (whether through the issuance or granting
  of options, warrants, commitments, subscriptions, rights to purchase or
  otherwise), pledge or otherwise encumber any shares of its capital stock or
  the capital stock of any of its subsidiaries, any other voting securities
  or any securities convertible into, or any rights, warrants or options to
  acquire, any such shares, voting securities or convertible securities or
  any other securities or equity equivalents (including without limitation
  stock appreciation rights) other than issuances upon exercise of Options or
  Warrants;
 
    (vii) amend its Certificate of Incorporation, By-Laws or equivalent
  organizational documents or alter through merger, liquidation,
  reorganization, restructuring or in any other fashion the corporate
  structure or ownership of any material subsidiary of the Company;
 
    (viii) make or agree to make any acquisition of assets which is material
  to the Company and its subsidiaries, taken as a whole, except for (x)
  purchases of inventory in the ordinary course of business, (y) pursuant to
  purchase orders entered into in the ordinary course of business which do
  not call for payments in excess of $50,000 per annum or (z) project-related
  expenditures which, individually, do not exceed $250,000; or
 
 
                                      19
<PAGE>
 
    (ix) settle or compromise any shareholder derivative suits arising out of
  the transactions contemplated hereby or any other litigation (whether or
  not commenced prior to the date of this Agreement) or settle, pay or
  compromise any claims not required to be paid.
 
  Section 6.02. No Solicitation.
 
  (a) From the date hereof until such time as Parent's designees shall
constitute a majority of the members of the Board of Directors of the Company,
the Company shall not, and shall not permit any of its subsidiaries, or any of
its or their officers, directors, employees, representatives, agents or
affiliates (including, without limitation, any investment banker, attorney or
accountant retained by the Company or any of its subsidiaries) to, directly or
indirectly, solicit or initiate any discussions or negotiations with, any
corporation, partnership, person or other entity or group (each, a
"Person"),concerning any offer or proposal which constitutes or is reasonably
likely to lead to any Acquisition Proposal (as defined below). Information may
be provided in response to a bona fide inquiry subject to the confidentiality
agreement referred to below, and negotiations may be conducted in response to
such inquiry. Upon having received a bona fide proposal that the Board of
Directors, consistent with its fiduciary duties and after the receipt of
advice from such Delaware counsel as may be appointed by the Board of
Directors concludes if consummated would be a Superior Proposal, the Board of
Directors may withdraw or modify its approval or recommendation of the Offer,
this Agreement or the Merger, approve or recommend the Superior Proposal or
terminate this Agreement pursuant to Section 9.01(d) hereof and shall promptly
notify Parent in writing of any such determination. For five (5) business days
after Parent has been informed by the Company of the above conclusion with
respect to such Superior Proposal, Parent shall have the right to match (the
"Counterproposal") the economic value of any such Superior Proposal. The
Company shall negotiate in good faith with respect to such Counterproposal.
Any information furnished to any Person in connection with an Acquisition
Proposal shall be provided pursuant to a confidentiality agreement in
customary form on terms not more favorable to such Person than the terms
contained in the Confidentiality Agreement (as defined in Section 7.02).
Subject to all of the foregoing requirements, the Company will immediately
notify Parent orally and in writing if any discussions or negotiations are
sought to be initiated, any inquiry or proposal is made, or any information is
requested by any Person with respect to any Acquisition Proposal or which
could lead to an Acquisition Proposal and immediately notify Parent of all
material terms of any proposal which it may receive in respect of any such
Acquisition Proposal, including the identify of the Person making the
Acquisition Proposal or the request for information, if known, and thereafter
shall inform Parent on a timely, ongoing basis of the status and content of
any discussions or negotiations with such a third party, including immediately
reporting any material changes to the terms and conditions thereof.
 
  (b) For purposes hereof:
 
    (i) "Acquisition Proposal" means any inquiry, proposal or offer from any
  person relating to any direct or indirect acquisition or purchase of 15% or
  more of any class of equity securities of the Company or any of its
  subsidiaries, any tender offer or exchange offer that if consummated would
  result in any person beneficially owning 15% or more of any class of equity
  securities of the Company or any of its subsidiaries, any merger,
  consolidation, business combination, sale of substantially all the assets,
  recapitalization, liquidation, dissolution or similar transaction involving
  the Company or any of its subsidiaries, other than the transactions
  contemplated by this Agreement, or any other transaction the consummation
  of which could reasonably be expected to impede, interfere with, prevent or
  materially delay the Offer and/or the Merger or which would reasonably be
  expected to dilute materially the benefits to Parent of the transactions
  contemplated hereby; and
 
    (ii) "Superior Proposal" means any bona fide written offer made by a
  third party that is either fully financed or with respect to which a highly
  confident and/or a commitment letter from a financial institution of
  adequate sophistication and capitalization has been issued to acquire,
  directly or indirectly, for consideration consisting of cash and/or
  securities, more than 50% of the shares of Company Common Stock then
  outstanding or all or substantially all the assets of the Company and
  otherwise on terms which the Board of Directors of the Company determines
  (after consultation with a nationally recognized investment bank) to be
  economically superior to the transaction contemplated by this Agreement.
 
                                      20
<PAGE>
 
  (c) Nothing contained in this Section 6.02 shall prohibit the Company from
taking and disclosing to its stockholders a position contemplated by Rule 14e-
2(a) promulgated under the Exchange Act or from making any disclosure to the
Company's stockholders if, in the good faith judgment of the Board of
Directors of the Company, after consultation with outside counsel, failure so
to disclose would be inconsistent with its fiduciary duties to the Company's
stockholders under applicable law; provided, however, neither the Company nor
its Board of Directors nor any committee thereof shall, except as permitted by
Section 6.02(a), withdraw or modify, or propose to withdraw or modify, its
position with respect to the Offer, this Agreement or the Merger or approve or
recommend, or propose to approve or recommend, an Acquisition Proposal.
 
  Section 6.03. Other Actions. The Company shall not, and shall not permit any
of its subsidiaries to, take any action that would, or that could reasonably
be expected to, result in (i) any of the representations and warranties of the
Company set forth in this Agreement that are qualified as to materiality
becoming untrue, (ii) any of such representations and warranties that are not
so qualified becoming untrue in any material respect or (iii) any of the Offer
Conditions not being satisfied (subject to the Company's right to take actions
specifically permitted by Section 6.02).
 
  Section 6.04. Notice of Certain Events. The Company and Parent shall
promptly notify each other of:
 
    (i) any notice or other communication from any person alleging that the
  consent of such person is or may be required in connection with the
  transactions contemplated by this Agreement;
 
    (ii) any notice or other communication from any Government Entity in
  connection with the transactions contemplated by this Agreement;
 
    (iii) any action, suits, claims, investigations or proceedings commenced
  or, to the actual knowledge of the executive officers of the notifying
  party, threatened against, relating to or involving or otherwise affecting
  such party or any of its subsidiaries;
 
    (iv) an administrative or other order or notification relating to any
  material violation or claimed violation of law;
 
    (v) the occurrence or non-occurrence of any event the occurrence or non-
  occurrence of which would cause any representation or warranty contained in
  this Agreement to be untrue or inaccurate in any material respect at or
  prior to the Closing Date; and
 
    (vi) any material failure of any party to comply with or satisfy any
  covenant, condition or agreement to be complied with or satisfied by it
  hereunder;
 
provided, however, that the delivery of any notice pursuant to this Section
6.04 shall not limit or otherwise affect the remedies available hereunder to
the party receiving such notice.
 
                                  ARTICLE VII
 
                             Additional Agreements
 
  Section 7.01. Stockholder Approval; Preparation of Proxy Statement. (a) If
the Company Stockholder Approval is required by law, the Company will, at
Parent's request, as soon as practicable following the acceptance for payment
of, and payment for, any Shares by Sub pursuant to the Offer and the
expiration of the Offer, duly call, give notice of, convene and hold a meeting
of its stockholders (the "Stockholders Meeting") for the purpose of obtaining
the Company Stockholder Approval. The Company will, through its Board of
Directors, recommend to its stockholders that the Company Stockholder Approval
be given. Notwithstanding the foregoing, if Sub or any other subsidiary of
Parent shall acquire at least 90% of the outstanding Shares, the parties
shall, at the request of Parent, take all necessary and appropriate action to
cause the Merger to become effective as soon as practicable after the
expiration of the Offer without a Stockholders Meeting in accordance with
Section 253 of the DGCL.
 
                                      21
<PAGE>
 
  (b) If the Company Stockholder Approval is required by law, the Company
will, at Parent's request, as soon as practicable following the acceptance for
payment of, and payment for, any Shares by Sub pursuant to the Offer and the
expiration of the Offer, prepare and file a preliminary Proxy Statement with
the SEC and will use its best efforts to respond to any comments of the SEC or
its staff and to cause the Proxy Statement to be mailed to the Company's
stockholders as promptly as practicable after responding to all such comments
to the satisfaction of the staff. The Company will notify Parent promptly of
the receipt of any comments from the SEC or its staff and of any request by
the SEC or its staff for amendments or supplements to the Proxy Statement or
for additional information and will supply Parent with copies of all
correspondence between the Company or any of its representatives, on the one
hand, and the SEC or its staff, on the other hand, with respect to the Proxy
Statement or the Merger. If at any time prior to the Stockholders Meeting
there shall occur any event that should be set forth in an amendment or
supplement to the Proxy Statement, the Company will promptly prepare and mail
to its stockholders such an amendment or supplement. The Company will not mail
any Proxy Statement, or any amendment or supplement thereto, to which Parent
reasonably objects.
 
  (c) Parent agrees to cause all Shares purchased pursuant to the Offer and
all other Shares owned by Parent or any subsidiary of Parent to be voted in
favor of the Company Stockholder Approval.
 
  Section 7.02. Access to Information. From the date hereof until such time as
Parent's designees shall constitute a majority of the members of the Board of
Directors of the Company, the Company shall give Parent and Sub, their
counsel, financial advisors, auditors and other authorized representatives
full access to the offices, properties, books and record of the Company and
its subsidiaries during normal business hours, will furnish to Parent and Sub,
their counsel, financial advisors, financial institutions auditors and other
authorized representatives such financial and operating data and other
information as such may be reasonably requested and will instruct the
employees of the Company and its subsidiaries, their counsel and financial
advisors to cooperate with Parent and Sub in their investigation of the
Business; provided, that no investigation pursuant to this Section 7.02 shall
affect any representation or warranty given by the Company to Parent and Sub
hereunder; and provided, further, that any information provided to Parent
and/or Sub pursuant to this Section 7.02 shall be subject to the
confidentiality agreement, dated as of November 5, 1997 (the "Confidentiality
Agreement"), the terms of which shall continue to apply, except as otherwise
agreed by the Company, unless and until Parent and Sub shall have purchased a
majority of the outstanding Shares pursuant to the Offer and notwithstanding
termination of this Agreement.
 
  Section 7.03. Reasonable Efforts; Financing. (a) Each of the Company, Parent
and Sub agree to use its reasonable best efforts to take, or cause to be
taken, all actions necessary to comply promptly with all legal requirements
which may be imposed on itself with respect to the Offer and the Merger (which
actions shall include furnishing all information required under the HSR Act
and in connection with approvals of or filings with any other Governmental
Entity) and will promptly cooperate with and furnish information to each other
in connection with any such requirements imposed upon any of them or any of
their subsidiaries in connection with the Offer and the Merger. Each of the
Company, Parent and Sub will, and will cause its subsidiaries to, use its
reasonable best efforts to take all reasonable actions necessary to obtain
(and will cooperate with each other in obtaining) any consent, authorization,
order or approval of, or any exemption by, any Governmental Entity or other
public or private third party required to be obtained or made by Parent, Sub,
the Company or any of their subsidiaries in connection with the Offer and the
Merger or the taking of any action contemplated thereby or by this Agreement,
except that no party need waive any substantial rights or agree to any
substantial limitation on its operations or to dispose of any assets.
 
  (b) Parent shall use reasonable efforts to cause the financing necessary for
satisfaction of the condition in subsection (i) of the Conditions of the Offer
on Exhibit A.
 
  Section 7.04. Options; Warrants. (a) The Company shall amend (i) ATC Group
Services Inc. 1988 Incentive and Non-Statutory Stock Option Plan, (ii) ATC
Group Services Inc. 1993 Incentive and Non-Statutory Stock Option Plan, (iii)
ATC Group Services Inc. 1995 Nonqualified Stock Option Plan, and any other
program pursuant to which there are holders of options (the "Options") to
purchase Shares granted by the Company
 
                                      22
<PAGE>
 
(collectively, the "Stock Option Plans") to provide that all outstanding,
unexercised Options shall be immediately exercisable and that if the optionees
do not exercise their unexercised Options, each optionee shall receive, in
settlement of each Option held by such optionee, a "Cash Amount" (less any
applicable withholding taxes) with respect to the number of previously
unexercised Shares underlying the Option immediately prior to the Effective
Time. The Company shall use its commercially reasonable efforts to amend the
Stock Option Plans to provide that each Option shall terminate as of the
Effective Time. The Cash Amount payable for each Option shall equal the
product of (i) the Merger Consideration minus the exercise price per Share of
each such Option and (ii) the number of previously unexercised Shares covered
by each such Option.
 
  (b) The Company shall provide notice to participants in the Stock Option
Plans and other holders of Options to purchase Shares granted by the Company
that the Company proposes to merge into another corporation; that the Optionee
under the plans or program may exercise his Options in full for all shares not
theretofore purchased by him prior to the Effective Time; and that the plans
and program have been amended to provide that to the extent an optionee does
not exercise such Options prior to the Effective Time, the optionee shall
receive, in settlement of each Option held by the optionee, a "Cash Amount"
(less any applicable withholding taxes) with respect to the number of
previously unexercised Shares underlying the Option immediately prior to the
Effective Time; that each Option shall terminate as of the Effective Time; and
that the Cash Amount payable for each Option shall equal the product of (i)
the Merger Consideration minus the exercise price per Share of each such
Option and (ii) the number of previously unexercised Shares covered by each
such Option.
 
  (c) Except as may be otherwise agreed to by Parent or Sub and the Company,
the Company's Stock Option Plans shall terminate as of the Effective Time and
the provisions in any other plan, program or arrangement providing for the
issuance or grant of any other interest in respect of the capital stock of the
Company or any of its Subsidiaries shall be deleted as of the Effective Time.
 
  (d) The Company shall use its commercially reasonable efforts so that
following the Effective Time no holder of employee stock options will have any
right to receive Shares upon exercise of an employee stock option.
 
  (e) Pursuant to the terms of (i) the warrant agreement, dated October 15,
1990, relating to 568,207 Class C Redeemable Common Stock Purchase Warrants,
(ii) warrant agreements relating to 490,500 warrants issued pursuant to the
merger between the Company and Aurora Environmental Inc. and (iii) the
consulting agreement, dated March 14, 1997, relating to 35,000 warrants issued
to First Montauk Securities Corp., the Company has issued warrants
(collectively, the "Warrants") to certain persons. The holders of the Warrants
shall be entitled either to exercise their Warrants for Shares in accordance
with the applicable agreement under which such Warrants were issued and tender
such Shares in the Offer or upon execution and delivery to the Company of a
cancellation agreement in form and substance reasonably satisfactory to the
Company, to receive from the Company at the Effective Time a Cash Amount equal
to the product of (i) the Merger Consideration minus the exercise price per
share of each such Warrant and (ii) the number of unexercised Shares covered
by each such Warrant.
 
  (f) Notwithstanding anything to the contrary herein, if it is determined
that compliance with any of the foregoing would cause any individual subject
to Section 16 of the Exchange Act to become subject to the profit recovery
provisions thereof, any Options or Warrants held by such individual will be
canceled or purchased, as the case may be, at the Effective Time or at such
later time as may be necessary to avoid application of such profit recovery
provisions and such individual will be entitled to receive from the Company or
the Surviving Corporation an amount in cash or other consideration
satisfactory to the Surviving Corporation and such individual equal to the
excess, if any, of the Merger Consideration over the per Share exercise price
of such Option or Warrant multiplied by the number of Shares subject thereto
(less any applicable withholding taxes), and the parties hereto will cooperate
and take any and all necessary actions so as to achieve the intent of the
foregoing without giving rise to such profit recovery.
 
 
                                      23
<PAGE>
 
  Section 7.05. Directors. Promptly upon the acceptance for payment of, and
payment for, 50.1% of the Shares by Sub pursuant to the Offer, Sub shall be
entitled to designate such number of directors on the Board of Directors of
the Company as will give Sub, subject to compliance with Section 14(f) of the
Exchange Act, a majority of such directors, and the Company shall, at such
time, cause Sub's designees to be so elected by its existing Board of
Directors; provided, however, that in the event that Sub's designees are
elected to the Board of Directors of the Company, until the Effective Time
such Board of Directors shall have at least two directors who are directors on
the date of this Agreement and who are not officers of the Company (the
"Independent Directors"); and provided, further, that, in such event, if the
number of Independent Directors shall be reduced below two for any reason
whatsoever, the remaining Independent Director shall designate a person to
fill such vacancy who shall be deemed to be an Independent Director for
purposes of this Agreement or, if no Independent Directors then remain, the
other directors shall designate two persons to fill such vacancies who shall
not be officers or affiliates of the Company or any of its subsidiaries, or
officers or affiliates of Parent or any of its subsidiaries, and such persons
shall be deemed to be Independent Directors for purposes of this Agreement.
Subject to applicable law, the Company shall take all action requested by
Parent necessary to effect any such election, including mailing to its
stockholders the Information Statement containing the information required by
Section 14(f) of the Exchange Act and Rule 14f-1 promulgated thereunder, and
the Company agrees to make such mailing with the mailing of the Schedule 14D-9
(provided that Sub shall have provided to the Company on a timely basis all
information required to be included in the Information Statement with respect
to Sub's designees). In connection with the foregoing, the Company will
promptly, at the option of Parent, either increase the size of the Company's
Board of Directors and/or obtain the resignation of such number of its current
directors as is necessary to enable Sub's designees to be elected or appointed
to, and to constitute a majority of, the Company's Board of Directors as
provided above.
 
  Section 7.06. Fees and Expenses. (a) In addition to any other amounts which
may be payable or become payable pursuant to any other paragraph of this
Section 7.06, in the event that this Agreement is terminated for any reason
other than a material breach by Parent or Sub, the Company shall promptly
reimburse the Parent or Sub, as the case may be, upon receipt of reasonably
satisfactory back-up documentation, for all out-of-pocket expenses and fees
(including, without limitation, fees and expenses payable to all Governmental
Entities, banks, investment banking firms and other financial institutions,
and their respective agents and counsel, and all fees and expenses of counsel,
accountants, financial printers, proxy solicitors, exchange agents, experts
and consultants to Parent and its affiliates), whether incurred prior to, on
or after the date hereof, in connection with the Merger and the consummation
of all transactions contemplated by this Agreement, and the financing thereof,
up to a maximum of $2.5 million. Except as otherwise specifically provided for
herein, whether or not the Merger is consummated, all costs and expenses
incurred in connection with this Agreement and the transactions contemplated
by this Agreement shall be paid by the party incurring such expenses.
 
  (b) In the event that (i) this Agreement is terminated pursuant to Section
9.01(d) or (e), or (ii) any Person (other than Parent or any of its
affiliates) shall have consummated an Acquisition Proposal within twelve
months following the termination of the Offer at a value at or above $12 per
share, then the Company shall pay to Parent, in the case of an event under (i)
above, promptly upon any such termination, and, in the case of an event under
(ii) above, at the time of any such consummation, a termination fee of $4.5
million (the "Termination Fee"); provided that in no event shall the aggregate
payment by the Company of fees and expenses and of the Termination Fee under
this Section 7.06 exceed $6.0 million.
 
  (c) The prevailing party in any legal action undertaken to enforce this
Agreement or any provision hereof shall be entitled to recover from the other
party the costs and expenses (including attorneys' and expert witness fees and
expenses) incurred in connection with such action.
 
  Section 7.07. Indemnification; Insurance. (a) Parent and Sub agree that all
rights to indemnification for acts or omissions occurring prior to the
Effective Time now existing in favor of the current or former directors,
officers, employees, fiduciaries or agents (the "Indemnified Parties") of the
Company and its subsidiaries as provided in their respective certificates of
incorporation or by-laws (or similar organizational documents) or
 
                                      24
<PAGE>
 
existing indemnification contracts shall survive the Merger and shall continue
in full force and effect in accordance with their terms.
 
  (b) It is understood and agreed that the Company shall, and from and after
the Effective Time, the Surviving Corporation and the Parent shall, indemnify,
defend and hold harmless the Indemnified Parties against all losses, claims,
damages, costs, expenses (including attorneys' fees and expenses), liabilities
or judgments, fines or amounts that are paid in settlement in connection with
any pending, threatened or actual claim, action, suit, proceeding or
investigation based in whole or in part or arising in whole or part out of the
fact that such person is or was a director, officer, employee or agent of the
Company or any of its subsidiaries or is or was serving at the request of the
Company as a director, officer, employee or agent of another corporation,
partnership, joint venture, employee benefit plan, trust or other enterprise
or by reason of anything done or not done by such person in any such capacity
whether pertaining to any matter existing or occurring at or prior to the
Effective Time or any acts or omissions occurring or existing at or prior to
the Effective Time and whether asserted or claimed prior to, or at or after,
the Effective Time ("Indemnified Liabilities"), including all Indemnified
Liabilities based in whole or in part on, or arising in whole or in part out
of, or pertaining to this Agreement or the transactions contemplated hereby,
in each case to the fullest extent permitted by applicable law (and the
Company, the Surviving Corporation, and Parent, as the case may be, shall pay
expenses in advance of the final disposition of any such action or proceeding
to each Indemnified Party to the fullest extent permitted by applicable law).
In determining whether an Indemnified Party is entitled to indemnification
under this Section 7.07(b), if requested by such Indemnified Party such
determination shall be made by special, independent counsel selected by the
Surviving Corporation and the Parent and reasonably approved by the
Indemnified Party, and who has not otherwise performed services for the
Surviving Corporation, Parent or their respective affiliates within the last
three years. Without limiting the foregoing, in the event any such claim,
action, suit, proceeding or investigation is brought against any Indemnified
Parties (whether arising before or after the Effective Time), (i) the
Indemnified Parties may retain Squadron, Ellenoff, Plesent & Sheinfeld, LLP or
other counsel reasonably satisfactory to the Company (or the Surviving
Corporation after the Effective time), and the Company (or, after the
Effective Time, the Surviving Corporation and Parent) shall pay all reasonable
fees and expenses of such counsel for the Indemnified Parties as promptly as
statements therefor are received; and (ii) the Company (or, after the
Effective Time, the Surviving Corporation and the Parent) will use all
reasonable best efforts to assist in the vigorous defense of any such matter;
provided, that none of the Company, the Surviving Corporation or Parent shall
be liable for any settlement effected without its prior written consent, which
consent shall not be unreasonably withheld. Any Indemnified Party wishing to
claim indemnification under this Section 7.07(b), upon learning of any such
claim, action, suit, proceeding or investigation, shall notify the Company
(or, after the Effective Time, the Surviving Corporation and Parent) (but the
failure so to notify shall not relieve a party from any liability which it may
have under this Section 7.07(b) except to the extent such failure prejudices
such party's position with respect to such claims) and shall deliver to the
Company (or, after the Effective Time, the Surviving Corporation and the
Parent) the undertaking contemplated by Section 145(e) of the DGCL, but
without any requirement for the posting of the bond. The Indemnified Parties
as a group may retain one law firm (plus local counsel, if necessary) to
represent them with respect to each such matter unless the use of the counsel
chosen to represent the Indemnified Parties would present such counsel with a
conflict of interest, or the representation of all of the Indemnified Parties
by the same counsel would be inappropriate due to actual or potential
differing interests between them, in which case such additional counsel as may
be required (as shall be reasonably determined by the Indemnified Parties and
the Company, the Surviving Corporation or Parent, as the case may be) and
satisfactory to the Company, the Surviving Corporation or Parent, as the case
may be, may be retained by the Indemnified Parties at the cost and expense of
the Company, the Surviving Corporation or Parent, as the case may be. The
Company and Sub agree that the foregoing rights to indemnification, including
provisions relating to advances of expenses incurred in defense of any action
or suit, existing in favor of the Indemnified Parties with respect to matters
occurring through the Effective Time, shall survive the Merger and shall
continue in full force and effect for a period of not less than six years
after the Effective Time; provided, however that all rights to indemnification
(including rights relating to advances of expenses) in respect of any
Indemnified Liabilities asserted or made within such period shall continue
until the disposition of such Indemnified Liabilities. Furthermore, the
provisions with respect to indemnification set forth in the Certificate of
Incorporation or Bylaws
 
                                      25
<PAGE>
 
of the Surviving Corporation shall not be amended for a period of six years
following the Effective Time to the extent that such amendment would adversely
affect the rights thereunder of individuals who at any time prior to the
Effective Time were directors, officers, employees or agents of the Company in
respect of actions or omissions occurring at or prior to the Effective Time.
 
  (c) The Company (or, after the Effective Time, the Surviving Corporation and
Parent) shall indemnify any Indemnified Party against all reasonable costs and
expenses (including attorneys' fees and expenses), such amounts to be payable
in advance upon request as provided in Section 7.07(b), relating to the
enforcement of such Indemnified Party's rights under this Section 7.07 or
under the documents referred to in this Section 7.07, but only to the extent
that such Indemnified Party is ultimately determined to be entitled to
indemnification hereunder or thereunder. Any amounts due pursuant to the
preceding sentence shall be payable upon request by the Indemnified Party.
 
  (d) For six years from the Effective Time, Parent shall, unless Parent
agrees in writing to guarantee the indemnification obligations set forth in
Section 7.07(a), maintain in effect the Company's current directors' and
officers' liability insurance covering those persons who are currently covered
by the Company's directors' and officers' liability insurance policy (a copy
of which has been heretofore delivered to Parent); provided, however, that in
no event shall Parent be required to expend in any one year an amount in
excess of 225% of the annual premiums currently paid by the Company for such
insurance (which the Company represents is currently not more than $98,250);
and, provided, further, that if the annual premiums of such insurance coverage
exceed such amount, Parent shall be obligated only to obtain a policy with the
greatest coverage available for a cost not exceeding such amount.
 
  (e) This Section 7.07 shall survive the consummation of the Merger at the
Effective Time, is intended to benefit the Company, Parent, the Surviving
Corporation and the Indemnified Parties, and shall be binding on all
successors and assigns of Parent and the Surviving Corporation.
 
  (f) In the event the Company or the Surviving Corporation or any of their
respective successors or assigns (i) consolidates with or merges into any
other person and shall not be the continuing or surviving corporation of such
consolidation or merger, or (ii) transfers all or substantially all of its
properties to any person, then, and in each case, proper provision shall be
made so that the successors and assigns of the Company and the Surviving
Corporation, as the case may be, shall assume the obligations set forth in
this Section 7.07.
 
  Section 7.08. Certain Litigation. The Company agrees that it will not settle
any litigation commenced after the date hereof against the Company or any of
its directors by any stockholder of the Company relating to the Offer, the
Merger or this Agreement, without the prior written consent of Parent. In
addition, the Company will not voluntarily cooperate with any third party
which may hereafter seek to restrain or prohibit or otherwise oppose the Offer
or the Merger and will cooperate with Parent and Sub to resist any such effort
to restrain or prohibit or otherwise oppose the Offer or the Merger, unless
the Board of Directors of the Company determines in good faith, after
consultation with outside counsel, that failing so to cooperate with such
third party or cooperating with Parent or Sub, as the case may be, would
constitute a breach of the director's fiduciary duties under applicable law.
 
  Section 7.09. Solvency Opinion. Parent shall deliver to the Board any
solvency letter from any third party appraisal or similar form that Parent
provides to the providers of financing under the Financing Commitment.
 
                                 ARTICLE VIII
 
                                  Conditions
 
  Section 8.01. Conditions to Each Party's Obligation To Effect the
Merger. The respective obligation of each party to effect the Merger shall be
subject to the satisfaction prior to the Closing Date of the following
conditions:
 
                                      26
<PAGE>
 
  (a) Company Stockholder Approval. If required by applicable law, the Company
Stockholder Approval shall have been obtained.
 
  (b) No Injunctions or Restraints. No statute, rule, regulation, executive
order, decree, temporary restraining order, preliminary or permanent
injunction or other order issued by any court of competent jurisdiction or
other Governmental Entity or other legal restraint or prohibition preventing
the consummation of the Merger shall be in effect; provided, however, that
each of the parties shall have used reasonable efforts to prevent the entry of
any such injunction or other order and to appeal as promptly as possible any
injunction or other order that may be entered.
 
  (c) Purchase of Shares. Sub shall have previously accepted for payment and
paid for Shares pursuant to the Offer.
 
  (d) HSR Approvals. The applicable waiting periods under the HSR Act shall
have expired or been terminated.
 
                                  ARTICLE IX
 
                       Termination, Amendment and Waiver
 
  Section 9.01. Termination. This Agreement may be terminated at any time
prior to the Effective Time, whether before or after approval of the terms of
this Agreement by the stockholders of the Company:
 
  (a) by mutual written consent of Parent and the Company, by action of their
respective Boards of Directors;
 
  (b) by Parent or the Company if the Merger shall not have been consummated
on or before June 30, 1998; provided, however, that neither Parent nor the
Company may terminate this Agreement pursuant to this Section 9.01(b) if such
party shall have materially breached this Agreement;
 
  (c) by Parent or the Company if any court of competent jurisdiction in the
United States or other United States Governmental Entity has issued an order,
decree or ruling or taken any other action restraining, enjoining or otherwise
prohibiting the Merger and such order, decree, ruling or other action shall
have become final and nonappealable; provided, however, that the party seeking
to terminate this Agreement shall have used its reasonable best efforts to
remove or lift such order, decree, ruling or other action;
 
  (d) by the Company if, prior to the consummation of the Offer, any person
has made a bona fide proposal relating to an Acquisition Proposal, or has
commenced a tender or exchange offer for the Shares, and the Company Board
concludes, consistent with its fiduciary duties and after the receipt of
advice from such Delaware counsel as may be appointed by the Board of
Directors, that such proposal if consummated would be a Superior Proposal;
 
  (e) by Parent, if prior to the consummation of the Offer the Company Board
shall have (i) failed to recommend to the stockholders of the Company that
they accept the Offer, tender their Shares pursuant to the Offer and approve
and adopt this Agreement (the "Stockholder Acceptance"), (ii) withdrawn or
materially modified its approval or recommendation of this Agreement, the
Offer or the Merger, (iii) shall have approved or recommended a Superior
Proposal, (iv) shall have resolved to effect any of the foregoing or (v) shall
have otherwise taken steps to impede the Stockholder Acceptance;
 
  (f) by the Parent, if prior to consummation of the Offer, there has been a
material violation or breach by the Company of any representation, warranty,
covenant or agreement contained in this Agreement (which violation or breach
is not cured by the Company within ten days after written notice reasonably
describing such breach); or
 
 
                                      27
<PAGE>
 
  (g) by the Company, if prior to the consummation of the Offer, there has
been a material violation or breach by Parent or Sub of any representation,
warranty, covenant or agreement contained in this Agreement (which violation
or breach is not cured by Parent or Sub within ten days after written notice
reasonably describing such breach, other than the obligations contained in the
last sentence of Section 1.01(a), which shall have no cure period).
 
  Section 9.02. Effect of Termination. In the event of a termination of this
Agreement pursuant to Section 9.01, this Agreement shall forthwith become void
and there shall be no liability or obligation on the part of Parent, Sub or
the Company or their respective officers or directors, except with respect to
the last sentence of Section 1.02(c), Section 4.16, Section 5.07, the last
clause of Section 7.02, Section 7.06, this Section 9.02 and Article X;
provided, however, that nothing herein shall relieve any party for liability
for any breach hereof.
 
  Section 9.03. Amendment. This Agreement may be amended by the parties
hereto, by action taken or authorized by their respective Boards of Directors,
at any time before or after obtaining the Company Stockholder Approval (if
required by law), but, after any such approval, no amendment shall be made
which by law requires further approval by such shareholders without obtaining
such further approval. This Agreement may not be amended except by an
instrument in writing signed on behalf of each of the parties hereto.
Following the election or appointment of the Sub's designees pursuant to
Section 7.05 and prior to the Effective Time, the affirmative vote of a
majority of the Independent Directors then in office shall be required by the
Company to (i) amend or terminate this Agreement by the Company, (ii) exercise
or waive any of the Company's rights or remedies under this Agreement or (iii)
extend the time for performance of Parent and Sub's respective obligations
under this Agreement.
 
  Section 9.04. Extension; Waiver. At any time prior to the Effective Time,
the parties hereto, by action taken or authorized by their respective Boards
of Directors, may, to the extent legally allowed, (i) extend the time for the
performance of any of the obligations or other acts of the other parties
hereto, (ii) waive any inaccuracies in the representations and warranties
contained herein or in any document delivered pursuant hereto or (iii) waive
compliance with any of this Agreements or conditions contained herein. Any
agreement on the part of a party hereto to any such extension or waiver shall
be valid only if set forth in a written instrument signed on behalf of such
party. The failure of any party hereto to assert any of its rights hereunder
or otherwise shall not constitute a waiver of those rights.
 
                                   ARTICLE X
 
                                 Miscellaneous
 
  Section 10.01. Nonsurvival of Representations and Warranties. The
representations and warranties in this Agreement or in any instrument
delivered pursuant hereto shall terminate at the Effective Time or, in the
case of the Company, shall terminate upon the acceptance for payment of, and
payment for, Shares by Sub pursuant to the Offer, unless the survival thereof
is provided for by their terms.
 
  Section 10.02. Notices. All notices and other communications hereunder shall
be in writing and shall be deemed given if delivered personally, telecopied
(which is confirmed), sent by overnight courier (providing proof of delivery)
or mailed by registered or certified mail (return receipt requested) to the
parties at the following addresses (or at such other address for a party as
shall be specified by like notice):
 
    (a) if to Parent or Sub, to:
 
      Weiss, Peck & Greer
      One New York Plaza
      New York, New York 10004
 
      Attention: Steven N. Hutchinson
 
      Telecopy No.: (212) 908-0112
 
                                      28
<PAGE>
 
    with a copy to:
 
      Chadbourne & Parke LLP
      30 Rockefeller Plaza
      New York, New York 10112
 
      Attention: Dennis J. Friedman, Esq.
 
      Telecopy No.: (212) 489-5303
 
    and
 
    (b) if to the Company, to:
 
      ATC Group Services Inc.
      104 East 25th Street, 10th Floor
      New York, New York 10010
 
      Attention: President
 
      Telecopy No.: (212) 598-4283
 
    with a copy to:
 
      Cadwalader, Wickersham & Taft
      100 Maiden Lane
      New York, New York 10038
 
      Attention: Lawrence A. Larose, Esq.
 
      Telecopy No.: (212) 504-6666
 
    with a copy to:
 
      Squadron, Ellenoff, Plesent & Sheinfeld LLP
      551 Fifth Avenue
      New York, NY 10176
 
      Attention: Joel I. Papernik, Esq.
 
  Section 10.03. Interpretation. When a reference is made in this Agreement to
an Article or a Section, such reference shall be to an Article or a Section of
this Agreement unless otherwise indicated. The table of contents and headings
contained in this Agreement are for reference purposes only and shall not
affect in any way the meaning or interpretation of this Agreement. Whenever
the words "include", "includes" or "including" are used in this Agreement,
they shall be deemed to be followed by the words "without limitation". The
phrase "made available" in this Agreement shall mean that the information
referred to has been made available if requested by the party to whom such
information is to be made available. As used in this Agreement, the term
"subsidiary" of any person means another person, an amount of the voting
securities, other voting ownership or voting partnership interests of which is
sufficient to elect at least a majority of its Board of Directors or other
governing body (or, if there are no such voting interests, 50% or more of the
equity interests of which) is owned directly or indirectly by such first
person. As used in this Agreement, "material adverse change" or "material
adverse effect" means, when used in connection with the Company, any change or
effect (or any development that, insofar as can reasonably be foreseen, is
likely to result in any change or effect) that, individually or in the
aggregate with any such other changes or effects, is materially adverse to the
business, financial condition or results of operations of the Company and its
subsidiaries taken as a whole. Notwithstanding the foregoing, a material
adverse change or material adverse effect shall not include any material
adverse change or material adverse effect caused by any change resulting from
the announcement of the Offer or the Merger.
 
 
                                      29
<PAGE>
 
  Section 10.04. Counterparts. This Agreement may be executed in two or more
counterparts, all of which shall be considered one and the same agreement and
shall become effective when two or more counterparts have been signed by each
of the parties and delivered to the other parties, it being understood that
all parties need not sign the same counterpart.
 
  Section 10.05. Entire Agreement; Third Party Beneficiaries. This Agreement
(including the documents and the instruments referred to herein) (a)
constitutes the entire agreement and supersedes all prior agreements and
understandings, both written and oral, among the parties with respect to the
subject matter hereof, and (b) except as provided in Section 7.07, is not
intended to confer upon any person other than the parties hereto any rights or
remedies hereunder.
 
  Section 10.06. Governing Law. This Agreement shall be governed and construed
in accordance with the laws of the State of New York without regard to any
applicable conflicts of law, except to the extent the DGCL shall be held to
govern the terms of the Merger.
 
  Section 10.07. Publicity. Except as otherwise required by law or the rules
of the Nasdaq National Market, for so long as this Agreement is in effect,
neither the Company nor Parent shall, or shall permit any of its subsidiaries
to, issue or cause the publication of any press release or other public
announcement with respect to the transactions contemplated by this Agreement
without the consent of the other party, which consent shall not be
unreasonably withheld.
 
  Section 10.08. Assignment. Neither this Agreement nor any of the rights,
interests or obligations hereunder shall be assigned by any of the parties
hereto (whether by operation of law or otherwise) without the prior written
consent of the other parties, except that Sub may assign, in its sole
discretion, any or all of its rights, interests and obligations hereunder to
any direct or indirect wholly owned subsidiary of Parent. Subject to the
preceding sentence, this Agreement will be binding upon, inure to the benefit
of and be enforceable by the parties and their respective successors and
assigns.
 
  Section 10.09. Enforcement. The parties agree that irreparable damage would
occur in the event that any of the provisions of this Agreement were not
performed in accordance with their specific terms or were otherwise breached.
It is accordingly agreed that the parties shall be entitled to an injunction
or injunctions to prevent breaches of this Agreement and to enforce
specifically the terms and provisions of this Agreement in any court of the
United States located in the State of New York or Delaware or in a New York or
Delaware state court, this being in addition to any other remedy to which they
are entitled at law or in equity. In addition, each of the parties hereto (i)
consents to submit to the personal jurisdiction of any Federal court located
in the States of New York or Delaware or any New York or Delaware state court
in the event any dispute arises out of this Agreement or any of the
transactions contemplated hereby, (ii) agrees that such party will not attempt
to deny or defeat such personal jurisdiction by motion or other request for
leave from any such court, (iii) agrees that such party will not bring any
action relating to this Agreement or any of the transactions contemplated
hereby in any court other than a Federal court sitting in the State of New
York or Delaware or a New York or Delaware state court and (iv) waives any
right to trial by jury with respect to any claim or proceeding related to or
arising out of this Agreement or any of the transactions contemplated hereby.
 
                                      30
<PAGE>
 
  In Witness Whereof, Parent, Sub and the Company have caused this Agreement
to be signed by their respective officers thereunto duly authorized as of the
date first written above.
 
                                          Acquisition Holdings, Inc.
 
                                                 /s/ Steven N. Hutchinson
                                          By: _________________________________
                                            Name: Steven N. Hutchinson
                                            Title: President
 
                                                   /s/ Tania R. Cochran
                                          By: _________________________________
                                            Name: Tania R. Cochran
                                             Title: Treasurer
 
                                          Acquisition Corp.
 
                                                 /s/ Steven N. Hutchinson
                                          By: _________________________________
                                            Name: Steven N. Hutchinson
                                            Title: President
 
                                                   /s/ Tania R. Cochran
                                          By: _________________________________
                                            Name: Tania R. Cochran
                                            Title: Treasurer
 
                                          ATC Group Services Inc.
 
                                                    /s/ Morry F. Rubin
                                          By: _________________________________
                                            Name: Morry F. Rubin
                                            Title: President and Chief
                                                   Executive Officer
 
                                          Approved:
 
                                                   /s/ Julia S. Heckman
                                          By: _________________________________
                                            Name: Julia S. Heckman
                                            Title: Member of the Special
                                                   Committee
 
                                                 /s/ Richard S. Greenberg
                                          By: _________________________________
                                            Name: Richard S. Greenberg
                                            Title: Member of the Special
                                                   Committee
 
                                      31
<PAGE>
 
                                   EXHIBIT A
 
                            Conditions of the Offer
 
  Notwithstanding any other term of the Offer or this Agreement, and in
addition to (and not in limitation of) Sub's right to extend and amend the
Offer at any time in its sole discretion (subject to the provisions of this
Agreement), Sub shall not be required to accept for payment or, subject to
applicable rules and regulations of the SEC, including Rule 14e-1(c) under the
Exchange Act (relating to Sub's obligation to pay for or return tendered
Shares after the termination or withdrawal of the Offer), to pay for, and may
delay the acceptance for payment of or, subject to the restriction referred to
above, the payment for, any Shares tendered pursuant to the Offer unless (i)
there shall have been validly tendered and not withdrawn prior to the
expiration of the Offer such number of Shares that would constitute a majority
of the outstanding Shares (determined on a fully diluted basis for all
outstanding stock options and any other rights to acquire Shares) (the
"Minimum Condition") and (ii) any waiting period under the HSR Act applicable
to the purchase of Shares pursuant to the Offer shall have expired or been
terminated. Furthermore, notwithstanding any other term of the Offer or this
Agreement, Sub shall not be required to accept for payment or, subject as
aforesaid, to pay for any Shares not theretofore accepted for payment or paid
for, and may terminate the Offer if, at any time on or after the date of this
Agreement and before the acceptance of such Shares for payment or the payment
therefor, any of the following conditions exists:
 
  (a) there shall be any action or proceeding commenced by any Governmental
Entity which has a reasonable likelihood of success and which, if decided
adversely to the Company, would have a material adverse effect on the Company,
(i) challenging the acquisition by Parent or Sub of any Shares under the Offer
or seeking to restrain or prohibit the making or consummation of the Offer or
the Merger or the performance of any of the other transactions contemplated by
this Agreement, or seeking to obtain from the Company, Parent or Sub any
damages that are material in relation to the Company and its subsidiaries
taken as a whole, (ii) seeking to prohibit or impose any material limitations
on Parent's or Sub's ownership or operation (or that of any of their
respective Subsidiaries or affiliates) of all or a material portion of the
Company's businesses or assets, or to compel Parent or Sub or their respective
Subsidiaries and affiliates to dispose of or hold separate any material
portion of the business or assets of the Company and its Subsidiaries taken as
a whole, (ii) seeking to impose material limitations on the ability of Sub, or
render Sub unable, to accept for payment, pay for or purchase some or all of
the Shares pursuant to the Offer and the Merger, (iii) seeking to impose
material limitations on the ability of Sub or Parent effectively to exercise
full rights of ownership of the Shares, including, without limitation, the
right to vote the Shares purchased by it on all matters properly presented to
the Company's stockholders, or (iv) which otherwise is reasonably likely to
have a material adverse effect on the Company;
 
  (b) there shall be any statute, rule, regulation, judgment, order or
injunction enacted, entered, enforced, promulgated or deemed applicable to the
Offer or the Merger, or any other action shall be taken by any Governmental
Entity or court, other than the application to the Offer or the Merger of
applicable waiting periods under the HSR Act that is reasonably likely to
result, directly or indirectly, in any of the consequences referred to in
clauses (i) through (v) of paragraph (a) above;
 
  (c) there shall have occurred any events after the date of this Agreement
that, either individually or in the aggregate, have caused or are reasonably
likely to cause a material adverse change with respect to the Company other
than a change resulting from the announcement of the Offer or the Merger;
 
  (d)(i) the Board of Directors of the Company or any committee thereof shall
have publicly (including by amendment of its Schedule 14D-9) withdrawn or
modified in a manner adverse to Parent or Sub its approval or recommendation
of the Offer, the Merger or this Agreement, or approved or recommended any
Acquisition Proposal, (ii) the Company shall have entered into any agreement
with respect to any Superior Proposal in accordance with Section 6.02(a) of
this Agreement or (iii) the Board of Directors of the Company or any committee
thereof shall have resolved to take any of the foregoing actions;
 
 
                                      32
<PAGE>
 
  (e) any of the representations and warranties of the Company set forth in
this Agreement shall not be true and correct in any material respect, in each
case at the date of this Agreement and at the scheduled or extended expiration
of the Offer, except for such breaches that would, individually or in the
aggregate, not have a material adverse effect on the Company;
 
  (f) the Company shall have failed to perform in any material respect any
material obligation or to comply in any material respect with any material
agreement or covenant of the Company to be performed or complied with by it
under this Agreement, except for such breaches that would, individually or in
the aggregate, not have a material adverse effect on the Company;
 
  (g) this Agreement shall have been terminated in accordance with its terms;
 
  (h) there shall have occurred (i) any general suspension of, or limitation
on prices for, trading in securities on the New York Stock Exchange or on
NASDAQ, (ii) a declaration of a banking moratorium or any suspension of
payments in respect of banks in the United States, (iii) a commencement of a
war, armed hostilities or other international or national calamity directly
involving the armed forces of the United States that materially and adversely
affects the financial markets in the United States, (iv) any material
limitation (whether or not mandatory) by any governmental authority on the
extension of credit by banks or other lending institutions, (v) in the case of
any of the foregoing existing at the time of the commencement of the Offer, a
material acceleration or worsening thereof; or
 
  (i) the Company shall fail to receive the proceeds of financing pursuant to
the Financing Letters set forth on Schedule 5.06 or involving such other
financing sources, as Parent and the Company shall reasonably agree and are
not materially more onerous, in amounts sufficient to consummate the
transactions contemplated by this Agreement, including, without limitation (i)
to pay, with respect to all Common Stock in the Merger, the Offer Price
pursuant to Section 1.01, (ii) to refinance the outstanding indebtedness of
the Company, (iii) to pay any fees and expenses in connection with the
transactions contemplated by this Agreement or the financing thereof and (iv)
to provide for the working capital needs of the Company following the Merger,
including, without limitation, if applicable, letters of credit.
 
  The foregoing conditions are for the sole benefit of Parent and Sub, may be
asserted by Parent or Sub regardless of the circumstances giving rise to such
condition (including any action or inaction by Parent or Sub not in violation
of this Agreement) and may be waived by Parent or Sub in whole or in part at
any time and from time to time in the sole discretion of Parent or Sub,
subject in each case to the terms of this Agreement. The failure by Parent or
Sub at any time to exercise any of the foregoing rights shall not be deemed a
waiver of any such right and each such right shall be deemed an ongoing right
which may be asserted at any time and from time to time.
 
                                      33

<PAGE>
 
                                                                   Exhibit(c)(2)

          THIS STOCKHOLDERS AGREEMENT (this "Agreement"), dated as of October
17, 1997, is among Acquisition Holdings, Inc., a Delaware corporation
("Holdco"), and the stockholders (the "Stockholders") of ATC Group Services Inc.
(the "Company") signatory hereto.

                                    RECITALS

          WHEREAS, Holdco has simultaneously herewith delivered to the Company
an offer letter, dated October 17, 1997, from Weiss, Peck & Greer, L.L.C.,
attached hereto as Exhibit A, pursuant to which Holdco through a subsidiary
would enter into a business combination with the Company (the "Transaction")
pursuant to an agreement and plan of merger in the form attached hereto as
Exhibit B (as the same may be negotiated and entered into by Holdco and/or its
affiliates and the Company, the "Merger Agreement") in accordance with which
Holdco would acquire the entire equity interest in the Company for $12 per share
of Common Stock; and

          WHEREAS, the Stockholders have agreed to vote 14.99% in the aggregate
of the Common Stock of the Company in favor of the Transaction and Holdco and
the Stockholders desire to memorialize certain other agreements, all as set
forth herein.

          NOW, THEREFORE, in consideration of the foregoing and the mutual
covenants and agreements herein contained and for other good and valuable
consideration, the receipt and adequacy of which is hereby acknowledged, the
parties hereto, intending to be legally bound, hereby agree as follows:

                                   AGREEMENT

1.        Certain Definitions.  For purposes of this Agreement:
          -------------------                                  

          "Acquisition Proposal" shall mean any inquiry, proposal or offer from
any Person relating to any direct or indirect acquisition or purchase of 15% or
more of the assets of the Company and its subsidiaries or 15% or more of any
class of equity securities of the Company or any of its subsidiaries, any tender
offer or exchange offer that if consummated would result in any Person
beneficially owning 15% or more of any class of equity securities of the Company
or any of its subsidiaries, any merger, consolidation, business combination,
sale of substantially all the assets, recapitalization, liquidation, dissolution
or similar transaction involving the Company or any of its subsidiaries, other
than the Transaction, or any other transaction the consummation of which could
reasonably be expected to impede, interfere with, prevent or materially delay
the Transaction or which would reasonably be expected to dilute materially the
benefits to Holdco of the Transaction.
<PAGE>
 
          "Beneficially Own" or "Beneficial Ownership" with respect to any
securities shall mean having "beneficial ownership" of such securities (as
determined pursuant to Rule 13d-3 under the Securities Exchange Act of 1934, as
amended (the "Exchange Act")), including pursuant to any agreement, arrangement
or understanding, whether or not in writing.  Without duplicative counting of
the same securities by the same holder, securities Beneficially Owned by a
Person shall include securities Beneficially Owned by all other Persons with
whom such Person would constitute a "group" within the meaning of Section 13(d)
of the Exchange Act.

          "Closing Date" shall mean the date set forth in the Merger Agreement,
if executed and delivered, as the closing date for the Transaction.

          "Common Stock" shall mean at any time the Common Stock, par value $.01
per share, of the Company.

          "Existing Shares" shall mean the shares of Common Stock owned by the
Stockholders on the date hereof.

          "Permitted Transfer" means a sale, transfer, assignment or other
disposition to a Permitted Transferee.

          "Permitted Transferee" means any person who is (A) the spouse or
former spouse of, or any lineal descendent of, or any spouse of such lineal
descendant of, or the grandparent, parent, brother or sister of, or spouse of
such brother or sister of, either of the Stockholders or of a Permitted
Transferee; (B) upon the death of any of the Stockholders or any Permitted
Transferee of such person, the executors of the estate of such Stockholder or
such Permitted Transferee, and any of such Stockholder's or such Permitted
Transferee's heirs, testamentary trustees, devisees, or legatees; (C) any trust
for the benefit of one or more of the Stockholders or Permitted Transferees; (D)
upon the disability of either of the Stockholders or any Permitted Transferee,
any guardian or conservator of such Stockholder or such Permitted Transferee;
(E) any corporation, partnership or other entity if at least 95% of the
beneficial ownership is held by either Stockholder individually or by the
Stockholders in the aggregate or Permitted Transferees, or (F) a lending
institution in whose favor either of the Stockholders pledges or otherwise
grants a security interest in any or all of the Proxy Shares (as defined herein)
for the purpose of obtaining one or more bona fide loans or advances for the
exercise of options, warrants or other rights held by either Stockholder to
acquire shares of Common Stock; provided, that in each case such transferee (in
                                --------                                       
the case of a transferee under clause (F) above, on behalf of itself and any
transferee of the collateral) assumes and agrees to perform and becomes a party
to this Agreement, agrees not to make an Acquisition Proposal, and agrees not to
dissent in the Transaction, all on terms reasonably acceptable to Holdco.  For
purposes of this Agreement, when a Permitted Transferee has

                                       2
<PAGE>
 
acquired Shares in accordance herewith, such person shall be deemed a
"Stockholder" hereunder.

          "Person" shall mean an individual, corporation, limited liability
company, partnership, joint venture, association, trust, unincorporated
organization or other entity.

          "Shares" shall mean the Existing Shares and any right to acquire
shares of Common Stock owned on the date hereof and any shares of Common Stock
or rights to acquire shares of Common Stock acquired by any Stockholder in any
capacity after the date hereof and prior to the termination of this Agreement.
"Shares" shall include (i) shares of Common Stock acquired upon the exercise of
options, warrants or other rights to acquire shares; (ii) shares of Common Stock
acquired upon the conversion or exchange of convertible or exchangeable
securities; (iii) shares of Common Stock acquired by means of purchase,
dividend, distribution, gift, bequest, inheritance or as a successor in interest
in any capacity or otherwise; and (iv) rights to acquire shares of Common Stock,
vested or not, presently exercisable or not, including, but not limited to,
options and warrants.  In the event of a stock dividend or distribution, or any
change in the Common Stock by reason of any stock dividend, split-up,
recapitalization, reclassification, combination, exchange of shares or the like,
the term "Shares" shall be deemed to refer to and include the Shares as well as
all such stock dividends and distributions and any shares into which or for
which any or all of the Shares may be changed, reclassified or exchanged and
appropriate adjustments shall be made to the terms and provisions of this
Agreement.  "Shares" shall also include voting trust certificates issued in
respect of any Shares.

          2.    Voting of Shares; No Inconsistent Agreements.
                -------------------------------------------- 
          (a)   With respect to the Shares identified as Proxy Shares on Exhibit
C attached hereto (the "Proxy Shares"), each Stockholder, subject to the terms
of this Agreement, hereby irrevocably grants to, and appoints, Holdco and any
other Person who shall hereafter be designated by Holdco, such Stockholder's
proxy and attorney-in-fact (with full power of substitution), for and in the
name, place and stead of such Stockholder, to vote such Stockholder's Proxy
Shares, or grant a consent or approval in respect of such Proxy Shares, at any
meeting of stockholders of the Company or at any adjournment thereof or in any
other circumstances upon which their vote, consent or other approval is sought,
(i) in favor of (A) the Transaction, (B) the Merger Agreement and (C) the
transactions contemplated by the Merger Agreement, including, but not limited
to, the amendments to the Certificate of Incorporation of the Company
contemplated thereby and (ii) against (other than in connection with the
Transaction) (A) any extraordinary corporate transaction, such as a merger,
consolidation or other business combination involving the Company or any of its
subsidiaries (other than the Transaction); (B) any sale, lease or transfer by
the Company of a material amount of

                                       3
<PAGE>
 
assets (including stock) of the Company or any of its subsidiaries, or a
reorganization, restructuring, recapitalization, special dividend, dissolution
or liquidation of the Company or any of its subsidiaries; and (C)(1) any change
in a majority of the persons who constitute the board of directors of the
Company or any of its subsidiaries; (2) any change in the present capitalization
of the Company or any of its subsidiaries including any proposal to sell a
substantial equity interest in the Company or any of its subsidiaries; (3) any
amendment of the Company or any of its subsidiaries' charters or by-laws; (4)
any other change in the Company or any of its subsidiaries' corporate structure
or business; and (5) any other action which, in the case of each of the matters
referred to in clauses (C)(1), (2), (3) or (4), is intended, or could reasonably
be expected, to impede, interfere with, delay, postpone, or materially adversely
affect the Transaction and the transactions contemplated by this Agreement and
the Merger Agreement.

        (b)  Such Stockholder represents that any proxies previously given in
respect of such Stockholder's Proxy Shares are not irrevocable, and that any
such proxies are hereby revoked.

        (c)  Such Stockholder hereby affirms that the irrevocable proxy set
forth in this Section 2 is given to secure the performance of the duties of the
Stockholder under this Agreement. Such Stockholder hereby further affirms that
such irrevocable proxy is coupled with an interest and may under no
circumstances be revoked, except in connection with the termination of this
Agreement pursuant to Section 7 hereof. Such Stockholder hereby ratifies and
confirms all that such irrevocable proxy may lawfully do or cause to be done by
virtue hereof. Such irrevocable proxy is executed and intended to be irrevocable
in accordance with the provisions of Section 212(e) of the Delaware General
Corporation Law.

        (d)  Each Stockholder severally and not jointly agrees that it shall not
enter into any agreement or understanding with any Person the effect of which
would be inconsistent with or violative of the provisions and agreements
contained herein, including in this Section 2. Further, from the date hereof
until such time as Holdco's designees shall constitute a majority of the members
of the Board of Directors of the Company, each Stockholder severally and not
jointly agrees that it will, if the Board of Directors of the Company fails or
refuses to submit the Transaction to the Company stockholders, vote all Proxy
Shares held of record or Beneficially Owned by such Stockholder to (i) call or
cause to be called a special meeting of stockholders of the Company (or effect a
written consent) to remove the directors of the Company who have so failed or
refused, or to increase the size of the Board of Directors and elect a majority
of new directors who will submit the Transaction to the stockholders of the
Company for a vote, and (ii) use its reasonable efforts to vote such Proxy
Shares to effect

                                       4
<PAGE>
 
such removal and replacement, or increase and election, and the submission of
the Transaction to the stockholders of the Company; and (iii), at any time after
initial approval by the stockholders of the Company of the Transaction, if so
requested by Holdco, vote such Proxy Shares to approve all or any actions
incident to the Transaction or the other matters referred to in this Section 2
by stockholder written consent.

        3.   Other Stockholder Covenants.
             --------------------------- 

        (a)  Restriction on Transfer; Proxies and Non-interference.  From the 
             -----------------------------------------------------        
date hereof through the Closing Date or the earlier termination of this
Agreement in accordance with its terms, and except for Permitted Transfers as
expressly permitted herein and subject to Section 3(f), each Stockholder
severally and not jointly agrees that it shall not directly or indirectly:

             (i)   offer for sale, sell, transfer, tender, pledge, encumber,
assign or otherwise dispose of, or enter into any contract, option or other
arrangement or understanding with respect to, or consent to the offer for sale,
sale, transfer, tender, pledge, encumbrance, assignment or other disposition of
(collectively, "transfer"), any or all of the Proxy Shares or any interest
therein;

             (ii)  grant any proxies or powers of attorney with respect to the
Proxy Shares, deposit the Proxy Shares into a voting trust or enter into a
voting agreement with respect to the Proxy Shares; or

             (iii) take any action that would make any representation or
warranty of such Stockholder contained herein untrue or incorrect or would
result in a breach by such Stockholder of its obligations under this Agreement.

        (b)  No Solicitation.
             --------------- 

             Subject to Section 3(f), from the date hereof until the Closing
Date, or the earlier termination of this Agreement in accordance with Section 7
hereof, each Stockholder severally and not jointly agrees that such Stockholder
shall not, and shall not permit any of such Stockholder's representatives,
agents or affiliates (including, without limitation, any investment banker,
attorney or accountant retained by any Stockholder) to, directly or indirectly,
enter into, solicit, initiate or continue any discussions or negotiations with,
or provide any information to, or otherwise cooperate in any other way with, any
Person or group, other than Holdco and its affiliates, concerning any offer or
proposal which constitutes or is reasonably likely to lead to an Acquisition
Proposal. Each Stockholder severally and not jointly agrees that it will
immediately notify Holdco orally and in writing if any discussions or
negotiations are sought to be initiated, any

                                       5
<PAGE>
 
inquiry or proposal is made, or any information is requested with respect to any
Acquisition Proposal or which could lead to an Acquisition Proposal, and
immediately notify Holdco of all material terms of any proposal which it may
receive in respect of any such Acquisition Proposal, including the identity of
the prospective purchaser or soliciting party if known, and thereafter shall
inform Holdco on a timely, ongoing basis of the status and content of any
discussions or negotiations with such a third party, including immediately
reporting any material changes to the terms and conditions thereof.

        (c)  Reliance.  Each Stockholder understands and acknowledges that 
             --------     
Holdco is proposing to enter into the Transaction in reliance upon each
Stockholder's execution and delivery of this Agreement.

        (d)  Further Assurances.  From time to time, at Holdco's request and 
             ------------------   
without further consideration, each Stockholder severally and not jointly agrees
that it shall execute and deliver such additional documents and take all such
further lawful action as may be necessary or desirable to consummate and make
effective, in the most expeditious manner practicable, the purposes of this
Agreement.

        (e)  Stockholder Termination Fee.  In the event that any Acquisition 
             ---------------------------        
Proposal is consummated, then each Stockholder shall pay to Holdco as soon as
practicable, but in no event longer than two business days after receipt of the
consideration paid to such Stockholder in connection with such Acquisition
Proposal an amount (the "Stockholder Termination Fee") equal to the product of
(x) the number of Shares Beneficially Owned by such Stockholder, multiplied by
(y) the excess of the per share value of consideration paid or payable in
consequence of consummation of the Acquisition Proposal (with the value of any
non-cash consideration being determined by agreement of Holdco and such
Stockholder or, failing such agreement within 10 business days of consummation
of such Acquisition Proposal, as provided below) over $12. In the case of
options on Shares, to the extent the same are cancelled for a payment in cash
(the "Option Payment"), the amount due hereunder shall be the amount by which
the Option Payment exceeds the product of (a) the number of Shares underlying
such options and (b) $12. In the event that the consideration paid or payable in
consequence of consummation of the Acquisition Proposal: (i) consists solely of
cash, then the Stockholder Termination Fee shall be payable solely in cash, or
(ii) consists of cash and other non-cash property, or solely non-cash property,
then the Stockholder Termination Fee shall be payable in cash and such non-cash
property in the same proportion as the cash bears to the value of the non-cash
property issued or issuable in consequence of consummation of the Acquisition
Proposal (as such value is determined herein).

          If Holdco and such Stockholder fail to agree promptly on the value of
such non-cash consideration, then the parties shall

                                       6
<PAGE>
 
appoint an independent investment banking firm reasonably acceptable to Holdco
and such Stockholder to act as arbitrator (the "Arbitrator"). Upon the selection
of the Arbitrator, Holdco on the one hand and such Stockholder on the other
shall deliver to the Arbitrator and to each other their last and final offer
concurrently in writing (the "Certified Offers"). The Certified Offers shall
list one amount which the submitting party asserts is the appropriate valuation
of such non-cash consideration as of the date of submittal. The Arbitrator's
sole role shall be to select which one of the two Certified Offers most closely
approximates the valuation the Arbitrator would have determined for such non-
cash consideration, taking into account current market valuations of any
publicly traded securities which constitute such non-cash consideration. The
Arbitrator shall notify the parties of such determination. The determination of
the Arbitrator shall be binding on the parties. All costs and expenses of the
Arbitrator shall be borne by the parties whose Certified Offer is not selected.

          Each Stockholder acknowledges that the agreements contained in this
Section 3(e) are an integral part of the transactions contemplated by this
Agreement and the Transaction.  Accordingly, if the Stockholder shall fail to
pay when due any amounts which shall become due under Section 3(e) hereof, the
Stockholder shall in addition hereto pay to Holdco all costs and expenses
(including fees and disbursements of counsel) incurred in collecting such
overdue amounts, together with interest on such overdue amounts from the date
such payment was required to be made until the date such payment is received at
a rate per annum equal to the Prime Rate as announced from time to time by
Citibank, N.A. as its "prime rate," "reference rate," "base rate" or other
similar rate.  Any payment required to be made pursuant to this Section 3(e)
shall be made when due by wire transfer of immediately available funds to an
account designated by Holdco.

          The parties agree and acknowledge that in the event that any
Acquisition Proposal is consummated, it would be impracticable and extremely
difficult to ascertain with certainty the amount of damages to Holdco.
Therefore, the parties agree that payment of the Stockholder Termination Fee
pursuant to this Section 3(e) shall represent full liquidated damages.  The
parties agree that no party shall be liable for special, indirect, incidental or
consequential damages of any nature arising from this Agreement.

          (f) Fiduciary Duty of Directors.  Holdco agrees and acknowledges that
              ---------------------------                                      
each Stockholder is a director of the Company, and, in such capacity, has
fiduciary duties to the stockholders of Company.  Nothing in this Agreement
(including, without limitation, Section 3(b)) shall be deemed to limit or affect
the obligation of each Stockholder, as a director of the Company, to take any
and all action as may be necessary in the exercise of his fiduciary duty to the
stockholders of the Company.

                                       7
<PAGE>
 
          4.   Representations and Warranties of Stockholders.  Each 
               ----------------------------------------------     
Stockholder hereby severally and not jointly (and solely with respect to itself
and the Shares held of record or Beneficially Owned by such Stockholder)
represents and warrants to Holdco as follows:

          (a)  Ownership of Shares.  Such Stockholder is the record and/or 
               -------------------   
Beneficial Owner of the Existing Shares set forth on Exhibit C hereto. On the
date hereof, the Existing Shares constitute all of the Shares owned of record or
Beneficially Owned by such Stockholder. With respect to the number of shares set
forth opposite such Stockholder's name on Exhibit C hereto, and with the
exceptions noted thereon, if any, such Stockholder has sole voting power and
sole power to issue instructions with respect to the matters set forth in
Sections 2 and 3 hereof, sole power of disposition, sole power of conversion,
sole power to demand appraisal rights and sole power to agree to all of the
matters set forth in this Agreement, in each case with respect to all of the
Existing Shares with no limitations, qualifications or restrictions on such
rights, subject to applicable securities laws and the terms of this Agreement.

          (b)  Due Authorization.  Such Stockholder has all requisite capacity,
               -----------------   
power and authority to execute and deliver this Agreement and perform its
obligations hereunder. This Agreement has been duly and validly executed and
delivered by such Stockholder and constitutes a valid and binding agreement
enforceable against such Stockholder in accordance with its terms except to the
extent (i) such enforcement may be limited by applicable bankruptcy, insolvency
or similar laws affecting creditors rights and (ii) the remedy of specific
performance and injunctive and other forms of equitable relief may be subject to
equitable defenses and to the discretion of the court before which any
proceeding therefor may be brought.

          (c)  No Conflicts.  Except for filings, authorizations, consents and 
               ------------ 
approvals contemplated by the Transaction and necessary for the consummation of
the transactions contemplated hereby and thereby, (i) no filing with, and no
permit, authorization, consent or approval of, any state or federal public body
or authority is necessary for the execution of this Agreement by such
Stockholder and the consummation by such Stockholder of the transactions
contemplated hereby and (ii) none of the execution and delivery of this
Agreement by such Stockholder, the consummation by such Stockholder of the
transactions contemplated hereby or compliance by such Stockholder with any of
the provisions hereof shall (A) result in a violation or breach of, or
constitute (with or without notice or lapse of time or both) a default (or give
rise to any third party right of termination, cancellation, material
modification or acceleration) under any of the terms, conditions or provisions
of any note, loan agreement, bond, mortgage, indenture, license, contract,
commitment, arrangement, understanding, agreement or other instrument or
obligation of any kind to which

                                       8
<PAGE>
 
such Stockholder is a party or by which such Stockholder or any of its
properties or assets may be bound, or (B) violate any order, writ, injunction,
decree, judgment, statute, rule or regulation applicable to such Stockholder or
any of its properties or assets.

        (d)  No Encumbrances.  Except as set forth on Exhibit C or as otherwise
             ---------------                                                   
permitted herein, the Shares and the certificates representing such Shares are
now, and at all times during the term hereof, will be, held by such Stockholder,
or by a nominee, custodian or trust for the benefit of such Stockholder, free
and clear of all liens, claims, security interests, proxies, voting trusts or
agreements, understandings or arrangements or any other encumbrances whatsoever,
except for any such arising hereunder.

        (e)  No Finder's Fees.  No broker, investment banker, financial advisor
             ----------------    
or other Person is entitled to any broker's, finder's, financial adviser's or
other similar fee or commission in connection with the transactions contemplated
hereby based upon arrangements made by or on behalf of such Stockholder.

        5.   Representations and Warranties of Holdco.  Holdco represents and 
             ----------------------------------------      
warrants to the Stockholders as follows:

        (a)  Organization.  Holdco is a corporation duly organized, validly 
             ------------   
existing and in good standing under the laws of its state of incorporation, and
has all requisite corporate power or other power and authority to execute and
deliver this Agreement and perform its obligations hereunder. The execution and
delivery by Holdco of this Agreement and the performance by Holdco of its
obligations hereunder have been duly and validly authorized by its Board of
Directors and, except as contemplated in the Transaction, no other corporate
proceedings on the part of Holdco are necessary to authorize the execution,
delivery or performance of this Agreement or the consummation of the
transactions contemplated hereby.

        (b)  Agreement.  This Agreement has been duly and validly executed and 
             ---------        
delivered by Holdco and constitutes a valid and binding agreement of Holdco
enforceable against Holdco in accordance with its terms, except that (i) such
enforcement may be subject to applicable bankruptcy, insolvency, or other
similar laws, now or hereafter in effect, affecting creditors' rights generally,
and (ii) the remedy of specific performance and injunctive and other forms of
equitable relief may be subject to equitable defenses and to the discretion of
the court before which any proceedings therefor may be brought.

        (c)  No Conflicts.  Except for filings, authorizations, consents, and 
             ------------    
approvals contemplated by the Transaction and necessary for the consummation of
the transactions contemplated hereby and thereby, (i) no filing with, and no
permit, authorization, consent or approval of, any state or federal public body
or authority is necessary for the execution of this Agreement 

                                       9
<PAGE>
 
by Holdco and the consummation by Holdco of the transactions contemplated
hereby, and (ii) none of the execution and delivery of this Agreement by Holdco,
the consummation by Holdco of the transaction contemplated hereby or compliance
by Holdco with any of the provisions hereof shall (A) conflict with or result in
any breach of the charter or bylaws of Holdco, (B) result in a violation or
breach of, or constitute (with or without notice or lapse of time or both) a
default (or give rise to any third-party right of termination, cancellation,
material modifications or acceleration) under any of the terms, conditions or
provisions of any note, loan agreement, bond, mortgage, indenture, license,
contract, commitment, arrangement, understanding, agreement or other instrument
or obligation of any kind to which Holdco is a party or by which Holdco of its
properties or assets may be bound, or (C) violate any order, writ, injunction,
decree, judgment, statute, rule or regulation applicable to Holdco or its
respective properties or assets.

        6.   Legend.
             ------
 
        (a)  Each Stockholder severally and not jointly agrees with, and
covenants to, Holdco that such Stockholder shall not request that the Company
register the transfer (by book-entry or otherwise) of any certificate or
uncertificated interest representing any of the Proxy Shares, unless such
transfer is in compliance with this Agreement.

        (b)  Each Stockholder severally and not jointly agrees that it shall
promptly after the date hereof surrender to Holdco all certificates representing
the Proxy Shares held by such Stockholder, and Holdco shall place the following
legend on such certificates, which legend, except as otherwise expressly
provided in this Agreement, shall remain on such certificates until the
termination of this Agreement:

        "THE SHARES REPRESENTED BY THIS CERTIFICATE ARE SUBJECT TO AN AGREEMENT,
        DATED AS OF OCTOBER 17, 1997 AMONG CERTAIN STOCKHOLDERS AND ACQUISITION
        HOLDINGS, INC. THE SHARES ARE SUBJECT TO RESTRICTIONS ON TRANSFER OR
        ENCUMBRANCE AND VOTING. A COPY OF THE AGREEMENT IS AVAILABLE AT THE
        PRINCIPAL OFFICE OF THE COMPANY."

        7.   Termination.  This Agreement shall terminate upon the earlier to 
             -----------     
occur of (i) the Closing Date and (ii) that date which is one year after the 
date hereof; provided, however, if Holdco shall have breached its obligations
             --------  -------     
under this Agreement or the Merger Agreement, then this Agreement shall
terminate in all respects (including, without limitation, Section 3(e)) 150 days
after the date hereof unless Holdco breaches its obligations under Section
10(a), in which case this Agreement shall terminate immediately upon such
breach. Notwithstanding the immediately

                                      10
<PAGE>
 
preceding sentence, the parties hereto agree that the provisions of Section 3(e)
(but only to the extent an Acquisition Proposal is made, proposed, communicated,
disclosed or consummated prior to termination hereunder) and Section 8 shall
survive any termination of this Agreement, and that no such termination shall
relieve any party of liability for a breach hereof prior to termination.

        8.    Confidentiality and Public Announcements.  The parties recognize 
              ----------------------------------------     
that successful consummation of the transactions contemplated by this Agreement
may be dependent upon confidentiality with respect to the matters referred to
herein. In this connection, pending public disclosure thereof, each of the
parties hereto severally and not jointly agrees not to disclose or discuss such
matters with anyone not a party to this Agreement (other than its counsel,
advisors, corporate parents and affiliates) without the prior written consent of
the other parties hereto, except for filings required pursuant to the Exchange
Act and the rules and regulations thereunder or disclosures its counsel advises
are necessary in order to fulfill its obligations imposed by law or the
requirements of any securities exchange. At all times during the term of this
Agreement, the parties hereto will consult with each other before issuing or
making any reports, statements or releases to the public with respect to this
Agreement or the transactions contemplated hereby and will use good faith
efforts to agree on the text of public reports, statements or releases.

        9.    Severance and Consulting Agreements.  Holdco and the Stockholders 
              -----------------------------------  
agree to enter into severance, consulting and non-competition agreements in the
forms attached hereto as Exhibits D-1 and D-2 on and as of the effective date of
the merger under the Merger Agreement.

        10.   General Provisions.
              ------------------
 
         (a)  Commercially Reasonable Efforts to Consummate the Transaction.  
              -------------------------------------------------------------   
Holdco agrees that if the Merger Agreement, in the form attached hereto (the
"Form Merger Agreement"), is acceptable to the Special Committee of Independent
Directors of the Company's Board of Directors (the "Special Committee"), Holdco
will execute the Form Merger Agreement; provided, however, that Holdco will not
                                        --------  -------      
be required to execute the Form Merger Agreement if the Company discloses on the
Company Disclosure Schedule (as such term is defined in the Form Merger
Agreement) an event or circumstance of which Holdco has no knowledge as of the
date hereof that would cause the representations and warranties in the Form
Merger Agreement to fail to be true and correct without regard to the Company
Disclosure Schedule. If such an event or circumstance is disclosed on the
Company Disclosure Schedule or if the Special Committee requests changes to the
Form Merger Agreement, Holdco agrees to negotiate the Merger Agreement in good
faith and to use its commercially reasonable efforts to consummate the
Transaction on terms mutually acceptable to the Special Committee and Holdco.

                                      11
<PAGE>
 
        (b)  Expenses. Whether or not the transactions contemplated hereby are
             --------    
consummated, all costs and expenses incurred in connection with this Agreement
and the transactions contemplated hereby shall be paid by the party incurring
such expenses, except as otherwise specifically noted herein or in the Merger
Agreement.

        (c)  Notices.  All notices, requests, demands and other communications 
             -------   
which are required or may be given under this Agreement shall be in writing and
shall be deemed to have been duly given when received if personally delivered;
when transmitted if transmitted by telecopy, electronic or digital transmission
method; the day after it is sent, if sent for next day delivery to a domestic
address by recognized overnight delivery service (e.g., Federal Express); and
upon receipt, if sent by certified or registered mail, return receipt requested.
In each case notice shall be sent to:

                           (i)  if to Holdco, to:

                           Acquisition Holdings, Inc.
                           c/o Weiss, Peck & Greer
                           One New York Plaza
                           New York, New York 10004
                           Attention: Steven N. Hutchinson
                           Telephone: (212) 908-9500
                           Telecopy: (212) 908-0112
 
                           with copies to:
 
                           Chadbourne & Parke LLP
                           30 Rockefeller Plaza
                           New York, New York  10112
                           Attention:  Dennis J. Friedman, Esq.
                           Telephone: (212) 408-5100
                           Telecopy: (212) 541-5369

                           (ii) if to the Stockholders, to the respective 
addresses set forth on Exhibit C.

        (d)  Interpretation.  When a reference is made in this Agreement to
             --------------                                                  
Sections, such reference shall be to a Section of this Agreement unless
otherwise indicated.  Headings contained in this Agreement are for reference
purposes only and shall not affect in any way the meaning or interpretation of
this Agreement.  Whenever the word "include," "includes" or "including" are used
in this Agreement, they shall be deemed to be followed by the words "without
limitation".  This Agreement shall not be construed for or against either party
by reason of the authorship or alleged authorship of any provision hereof or by
reason of the status of the respective parties.  All terms defined in this
Agreement in the 

                                      12
<PAGE>
 
singular shall have comparable meanings when used in the plural, and vice versa,
unless otherwise specified.

        (e)  Entire Agreement; No Third-Party Beneficiaries.  This Agreement
             ---------------------------------------------- 
constitutes the entire agreement and supersedes all prior agreements and
understandings, both written and oral, among the parties with respect to the
subject matter hereof and is not intended to confer upon any Person other than
the parties hereto any rights or remedies hereunder.

        (f)  Assignment.  Except in connection with Permitted Transfers, 
             ----------   
neither this Agreement nor any of the rights, interests or obligations hereunder
shall be assigned (whether by operation of law or otherwise) by any Stockholder
without the consent of Holdco. Subject to the preceding sentence, this Agreement
will be binding upon, inure to the benefit of and be enforceable by the parties
and their respective successors and assigns.

        (g)  Governing Law.  This Agreement shall be construed, interpreted 
             -------------       
and the rights of the parties determined in accordance with the laws of the
State of New York (without reference to the choice of law provisions), except
with respect to matters of law concerning the internal corporate affairs of any
corporate entity which is a party to or the subject of this Agreement, and as to
those matters the law of the jurisdiction under which the respective entity
derives its powers shall govern.

        (h)  Severability.  Each party agrees that, should any court or other
             ------------   
competent authority hold any provision of this Agreement or part hereof to be
null, void or unenforceable, or order any party to take any action inconsistent
herewith or not to take an action consistent herewith or required hereby, the
validity, legality and enforceability of the remaining provisions and
obligations contained or set forth herein shall not in any way be affected or
impaired thereby.  Upon any such holding that any provision of this Agreement is
null, void or unenforceable, the parties will negotiate in good faith to modify
this Agreement so as to effect the original intent of the parties as closely as
possible in an acceptable manner to the end that the transactions contemplated
by this Agreement are consummated to the extent possible.  Except as otherwise
contemplated by this Agreement, to the extent that a party hereto took an action
inconsistent herewith or failed to take action consistent herewith or required
hereby pursuant to an order or judgment of a court or other competent authority,
such party shall incur no liability or obligation unless such party did not in
good faith seek to resist or object to the imposition or entering of such order
or judgment.

        (i)  Injunctive Relief.  Subject to the last paragraph of Section 3(e),
             -----------------  
the parties acknowledge that it will be impossible to measure in money the
damages that would be suffered if the parties fail to comply with any of the
obligations herein imposed on them and that in the event of any such failure, an
aggrieved 

                                      13
<PAGE>
 
Person or entity will be irreparably damaged and will not have an adequate
remedy at law. Subject to the last paragraph of Section 3(e), any such Person or
entity shall, therefore, be entitled to injunctive relief, including specific
performance, to enforce such obligations, and if any action should be brought in
equity to enforce any of the provisions of this Agreement, none of the parties
shall raise the defense that there is an adequate remedy at law.

        (j)  Attorneys' Fees.  If any party to this Agreement brings an action 
             ---------------  
to enforce its rights under this Agreement, the prevailing party shall be
entitled to recover its costs and expenses, including without limitation
reasonable attorneys' fees, incurred in connection with such action, including
any appeal of such action.

        (k)  Cumulative Remedies.  Subject to the last paragraph of Section 3
             -------------------      
(e), all rights and remedies of either party hereto are cumulative of each other
and of every other right or remedy such party may otherwise have at law or in
equity, and the exercise of one or more rights or remedies shall not prejudice
or impair the concurrent or subsequent exercise of other rights or remedies.

        (l)  Counterparts.  This Agreement may be executed in two or more
             ------------                                                  
counterparts, all of which shall be considered one and the same instrument and
shall become effective when executed and delivered by each of the parties.

        (m)  Amendments, Waivers, Etc.  This Agreement may not be amended, 
             -------------------------     
changed, supplemented, waived or otherwise modified or terminated, except upon
the execution and delivery of a written agreement executed by the parties
hereto.

        (n)  Binding Agreement.  Each Stockholder agrees that this Agreement 
             -----------------     
and the obligations hereunder shall attach to the Shares and shall be binding
upon any Person or entity to which legal or Beneficial Ownership of such shares
shall pass, whether by operation of law or otherwise, including, without
limitation, such Stockholder's heirs, distributees, guardians, administrators,
executors, legal representatives, or successors or other transferees (for value
or otherwise) and any other successors in interest. Notwithstanding any transfer
of Shares the transferor shall remain liable for the performance of all
obligations under this Agreement of the transferor.

        (o)  Capacity.  For purposes of this Agreement and the representations,
             --------                                                          
covenants and promises contained herein, each of the Stockholders is acting
solely in his capacity as a stockholder of, and not as a director, officer,
employee, representative or agent of, the Company.

        (p)  Obligations of the Stockholders.  The liabilities and obligations 
             -------------------------------    
of each Stockholder under any provision of this 

                                      14
<PAGE>
 
Agreement are several and not joint and apply solely to such Stockholder and to
the Shares held of record or Beneficially Owned by such Stockholder. No
Stockholder shall have any liability or obligation under this Agreement for any
act, omission or breach by any other Stockholder.

        (q)  Consent and Jurisdiction.  Each party irrevocably and 
             ------------------------  
unconditionally agrees and consents that any suit, action or other legal
proceeding arising out of or related to this Agreement shall be brought and
heard in New York County, State of New York and each party irrevocably consents
to personal jurisdiction in any and all tribunals in said County.

                                      15
<PAGE>
 
          IN WITNESS WHEREOF, the parties have executed this Agreement as of the
date first written above.

                                         Acquisition Holdings, Inc.
 
 
 
                                         By: /s/ Steven N. Hutchinson
                                            -----------------------------------
                                            Name:  Steven N. Hutchinson
                                                   President
 
 
 
                                            /s/ Morry F. Rubin
                                         --------------------------------------
                                            Morry F. Rubin


 
 
                                            /s/ George Rubin
                                         --------------------------------------
                                            George Rubin
                                        


                                      16
<PAGE>
 
 
                                                                       EXHIBIT C


STOCKHOLDER                           EXISTING SHARES (#)       PROXY SHARES (#)
- -----------                           -------------------       ----------------
                                                                              
George Rubin                               1,022,042                720,035   
c/o ATC Group Services Inc.                                                    
104 East 25th Street                                                          
New York, New York 10010                                                      
Tel: (212) 353-8280                                                           
Fax: (212) 598-4283                                                           
                                                                              
with a copy to:                                                                
                                                                              
Cadwalader, Wickersham & Taft                                                 
100 Maiden Lane                                                               
New York, New York 10038                                                      
Tel: (212) 504-6000                                                           
Fax: (212) 504-6666                                                           
                                                                              
 Attn: Lawrence A. Larose, Esq.                                              
                                                                              
Morry F. Rubin                               638,739                449,995   
c/o ATC Group Services Inc.                                                   
104 East 25the Street                                                         
New York, New York 10010                                                      
Tel: (212) 353-8280                                                           
Fax: (212) 598-4283                                                           
                                                                              
with a copy to:                                                               
                                                                              
Cadwalader, Wickersham & Taft                                                 
100 Maiden Lane                                                               
New York, New York 10038                                                      
Tel: (212) 504-6000                                                           
Fax: (212) 504-6666                                                           
                                                                              
 Attn: Lawrence A. Larose, Esq.                                              
                                                                              
  Total                                    1,660,781              1,170,030   
                                                                              
Total Outstanding*                         7,805,407                          
                                                                              
                                                                              
                                                                              
                                                                               

- --------------------------
*       As of August 18, 1997.


<PAGE>
 
                                                                  EXHIBIT (c)(3)

              SEVERANCE, CONSULTING AND NON-COMPETITION AGREEMENT

          THIS SEVERANCE, CONSULTING AND NON-COMPETITION AGREEMENT (this
"Agreement"), dated as of ______________, 199_ is by and between ATC Group
Services Inc. with its principal office at 104 East 25th Street, 10th Floor, New
York, New York 10010 (the "Company") and George Rubin [address] ("Employee").

                                    RECITALS

          WHEREAS, Employee serves as a Director and Chairman of the Board and
is employed by the Company as Secretary;

          WHEREAS, Employee is currently compensated at the rate of $300,000 per
year with a bonus equal to 2.5% of the Company's pre-tax profits (in the
aggregate, the "Compensation");

          WHEREAS, the Employee desires to resign his employment with the
Company and his position as Director as of the effective date of the proposed
merger between Acquisition Holdings, Inc. or an affiliate thereof and the
Company (the "Effective Date");

          WHEREAS, the parties desire to set forth their respective rights and
obligations in respect of Employee's resignation from the above positions; and

          WHEREAS, the Company and Employee desire to enter into a consulting
agreement as set forth herein.

          NOW, THEREFORE, in consideration of the covenants and conditions set
forth herein, the parties, intending to be legally bound, agree as follows:

                                   AGREEMENT

          1.  Resignation.
              ----------- 

          (a) Employee hereby resigns from his employment with the Company with
effect on and as of the Effective Date.  It is agreed by the parties that, on
and as of the Effective Date, all rights and obligations of Employee and the
Company with respect to such employment shall terminate.

          (b) Employee hereby resigns as Director and Chairman of the Board of
the Company with effect on and as of the Effective Date.

          2.  Consulting Services.  For a period of three (3) years after the
              -------------------                                            
Effective Date, Employee agrees to make himself available at reasonable times
and locations (taking
<PAGE>
 
necessary account of Employee's business commitments) to perform consulting
services as reasonably requested by the Company provided, (i) the Employee shall
be given at least 48 hours prior written notice of the requested services, (ii)
all such consulting services shall be rendered in The City of New York and (iii)
Employee shall not be required to devote more than 10 hours per month to the
business of the Company.  All consulting services rendered to the Company by
Employee shall be performed as an independent contractor, and Employee shall not
for any purpose be deemed to be an employee of the Company.

          3.  Benefits.
              -------- 

          (a) Payment.  In consideration of the agreements of Employee herein
              -------                                                        
and without diminution because of the ability or inability of Employee to
perform any consulting services that may be requested by the Company, the
Company agrees to pay Employee (or his assigns or, in the event of his death,
his executor) the aggregate sum of three million two hundred ten thousand two
hundred ninety dollars ($3,210,290), less applicable withholdings for federal,
state and local taxes, to be paid as follows: (i) $1,550,000 shall be paid on
the Effective Date and (ii) $276,715 shall be paid on each January 1, April 1,
July 1, and October 1, commencing on the first such day that occurs at least one
month following the Effective Date and ending with the sixth such payment.  Any
tax liability incurred by Employee in respect of consideration received
hereunder hereof shall be borne by him.  The parties hereto agree that (x)
$986,000 of the aggregate amount payable hereunder shall be allocated to
severance payments; (y) $300,000 shall be allocated as a pro rata bonus for the
fiscal year ending February 28, 1998; and (z) $1,924,290 of the aggregate amount
payable hereunder shall be allocated to Employee's covenant not to compete in
Section 6 herein.

          (b) Health Insurance.  For the three (3) year period commencing on the
              ----------------                                                  
Effective Date, Employee and the members of his immediate family shall be
entitled to participate in and receive benefits under: (i)  ATC Management
Inc.'s health coverage plan with Unicare or any health insurance plan
subsequently adopted by the Company in its place; and (ii) the Executive
Supplement Plan to ATC Management Inc.'s health coverage plan with Unicare as
long as the Company is able to obtain coverage for Employee under the
supplemental plan; provided, that, the Company shall use commercially reasonable
                   --------  ----                                               
efforts to maintain substantially similar coverage during the term of this
Agreement.  During such period, Employee shall pay all premiums, deductibles and
other charges arising out of or associated with the coverage of Employee and his
immediate family under the insurance plans described in clauses (i) and (ii)
hereof; provided, that, such premiums, deductibles and other charges do not
        --------  ----                                                     
increase

                                       2
<PAGE>
 
disproportionately for Employee as compared with other senior executives of the
Company.

          (c) Car Lease.  On the Effective Date, Employee shall return to the
              ---------                                                      
Company the Range Rover vehicle leased by the Company and used by the Employee.

          4.  Expenses.  All reasonable expenses incurred by Employee in
              --------                                                  
connection with the provision of consulting services requested hereunder,
including for airfare, hotel accommodations, meals and the like, shall be
reimbursed by the Company within seven (7) days after presentation by Employee
of receipts and other supporting documentation, provided that such expense had
been approved in advance by the Company.

          5.  No Solicitation of Employees.  Employee hereby represents and
              ----------------------------                                 
warrants that he has not solicited for employment or induced any person employed
by the Company to terminate employment during the sixty-day period preceding the
date hereof.

          6.  Covenant Not to Compete.
              ----------------------- 

          (a) Employee hereby covenants and agrees that Employee shall not,
alone or in conjunction with any other person or entity, whether as a principal,
agent, stockholder, director, officer, manager, trustee, representative,
employee, executive or consultant or in any other capacity, for whatever reason,
directly or indirectly: (i) for a period of four (4) years after the Effective
Date, compete or assist any person or entity in competing with the Company in
all aspects of the business as conducted by the Company on the Effective Date in
any manner in the United States, except as permitted in clauses (iii) and (iv)
below; provided, that, upon written notice by the Company of Employee's breach
       --------  ----                                                         
of this Section 6(a)(i), Employee shall have 10 (ten) business days from the
date of notice to cure any such breach; (ii) for a period of four (4) years
after the Effective Date, request or cause any person employed by the Company on
or after the date hereof to terminate employment, subject to clauses (iii) and
(iv) below; (iii) for a period three (3) years after the Effective Date, compete
or assist any person or entity in competing with ATC InSys Technology Inc.
("InSys") or 3D Information Services Inc. ("3D") or assist any person or entity
in competing with InSys or 3D anywhere within the legal boundaries of the State
of New Jersey; or (iv) for a period three (3) years after the Effective Date,
solicit on behalf of himself or any other person or entity, within The City of
New York, any of the following customers of InSys:  (A) J.P. Morgan & Co.
Incorporated, (B) Merrill, Lynch & Co. (C) The Long Island Rail Road Co. and (D)
The Chase Manhattan Bank; provided, however, that the immediately preceding
                          --------  -------                                
clause (iv) shall apply only to products or services that are competitive with
those of InSys.  This Section 6 shall not be deemed to

                                       3
<PAGE>
 
prohibit the Employee from owning up to 5% of the outstanding voting securities
of any issuer whose securities are listed or traded on a U.S. national stock
exchange, the Nasdaq National Market System or a comparable foreign exchange or
system.

          (b) If the scope of any restriction contained in this Agreement is too
broad to permit enforcement of such restriction to its fullest extent, then such
restriction shall be enforced to the maximum extent permitted by law, and
Employee hereby consents and agrees that such scope may be judicially modified
accordingly in any proceeding brought to enforce such restriction.  Employee
acknowledges and agrees that the covenants contained herein are necessary for
the protection of the Company's legitimate business interests and are reasonable
in scope and content.  Employee further acknowledges and understands that the
remedy at law for any breach by him of this Section 6 will be inadequate, and
that the damages flowing from such breach are not readily susceptible to being
measured in monetary terms.  Accordingly, it is acknowledged that upon
Employee's violation of any provision of this Section 6, the Company shall be
entitled to immediate injunctive relief and may obtain a temporary order
restraining any threatened or further breach.  Nothing in this Section 6 shall
be deemed to limit the Company's remedies at law or in equity for any breach by
Employee of any of the provisions of Section 6 which may be pursued or availed
of by the Company.

          7.  Release.  The Company hereby releases the Employee and the
              -------                                                   
Employee hereby releases the Company and its affiliates and its and their
present and former stockholders, directors, officers, employees, agents,
attorneys, successors and assigns (together, the "Company Released Parties"),
from any and all claims that each of the Employee or the Company Released
Parties has or may have arising in any way out of Employee's employment with the
Company and service as Director and Chairman of the Board and the cessation
thereof, including, but not limited to, any and all claims each of the Employee
or the Company had, has or may have with respect to the Compensation.
Notwithstanding the above, this provision is not intended to release any claims
that may arise after the date Employee executes this Agreement, including claims
to enforce this Agreement.

          8.  Retained Property.  Employee represents that he has returned all
              -----------------                                               
property of the Company in his possession, including but not limited to credit
cards, security key cards, telephone cards, car service cards, computer software
or hardware, company identification cards, Company records and copies of
records, correspondence and copies of correspondence and other books or manuals
issued by the Company.  Employee also warrants that he has no debts to or loans
from the Company.  Notwithstanding the foregoing, Employee shall have the right
to retain (i) duplicate photocopies of books and

                                       4
<PAGE>
 
records of the Company that do not fall within the category of "Confidential
Information" (as defined below) and (ii) all personal property of the Employee
located on the premises of the Company.

          9.  Confidentiality.  Employee acknowledges that he has had and may in
              ---------------                                                   
the performance of consulting services hereunder continue to have access to
Confidential Information (as hereinafter defined) of the Company.  Employee
agrees not to disclose, communicate or divulge to, or use for the direct or
indirect benefit of, any person (including Employee), firm, association or other
entity (other than the Company or its affiliates) any Confidential Information.
"Confidential Information" includes, but is not limited to, business methods,
business policies, procedures, techniques, research or development projects or
results, trade secrets (which Employee agrees include the Company's customer and
prospective customer lists), pricing policies, business plans, computer
software, intellectual property, and other such information not otherwise
available to the general public, unless the information is disclosed to Employee
without confidential or proprietary restriction by the Company or a third party
who rightfully possesses the information (without confidential or proprietary
restriction) and did not learn of it, directly or indirectly, from the Company.
If any person (including any government employee) requests the disclosure or
release of Confidential Information, Employee shall (i) promptly notify the
Company of such request so that the Company may pursue any available remedies to
prevent the disclosure or release of such Confidential Information and (ii)
furnish the Company a copy of all written materials pertaining to such request
for Confidential Information as the Company shall deem appropriate.

          10.  No Claims.  Employee represents and warrants that he has not
               ---------                                                   
filed any charges, claims or complaints against the Company Released Parties,
and he represents and warrants that he will not initiate or voluntarily
participate or assist in any charge, claim, or complaint against the Company
Released Parties, it being understood that this provision does not affect
Employee's right to enforce this Agreement, or legal obligation, if any, to
appear as a witness if subpoenaed for examination before trial or subpoenaed for
trial or hearing or, if required, to provide information to the Equal Employment
Opportunity Commission or to an equivalent state or local administrative agency
in response to a demand for information.

          11.  Benefits Terminated.  Employee acknowledges that he is not
               -------------------                                       
entitled to receive benefits from the Company other than as set forth in Section
3 of this Agreement, except for any vested benefits to which Employee is
entitled in the Company's 401(k) Plan and except for any other benefits afforded
Employee by applicable law.

                                       5
<PAGE>
 
          12.  No Inducements.  Employee warrants that he is entering into this
               --------------                                                  
Agreement voluntarily, and that, except as set forth herein, no promises or
inducements for this Agreement have been made, and he is entering into this
Agreement without reliance upon any statement or representation by any of the
Company Released Parties or any other person, concerning any fact material
hereto.

          13.  Integration.  This Agreement constitutes the entire agreement
               -----------                                                  
between the parties with respect to the subject matter hereof, and supersedes
any and all prior agreements or understandings between the parties arising out
of or relating to the Employee's employment and the cessation thereof.  This
Agreement may only be changed by written agreement executed by the parties.

          14.  Governing Law.  This Agreement shall be governed by the laws of
               -------------                                                  
the State of New York, without giving effect to the conflicts of law principles
thereof.

                                       6
<PAGE>
 
          IN WITNESS WHEREOF, the parties hereto have executed this Agreement as
of the day and year first above written.

                                 ATC GROUP SERVICES INC.
 
                                 ------------------------------
                                 By:
                                 Name:
 

                                 EMPLOYEE
 
                                 

                                 ------------------------------
                                 George Rubin

                                       7

<PAGE>
 
                                                                  EXHIBIT (c)(4)

              SEVERANCE, CONSULTING AND NON-COMPETITION AGREEMENT

          THIS SEVERANCE, CONSULTING AND NON-COMPETITION AGREEMENT (this
"Agreement"), dated as of ______________, 199_ is by and between ATC Group
Services Inc. with its principal office at 104 East 25th Street, 10th Floor, New
York, New York 10010 (the "Company") and Morry F. Rubin [address] ("Employee").

                                   RECITALS

          WHEREAS, Employee serves as a Director and is employed by the Company
as President and Chief Executive Officer;

          WHEREAS, Employee is currently compensated at the rate of $300,000 per
year with a bonus equal to 2.5% of the Company's pre-tax profits (in the
aggregate, the "Compensation");

          WHEREAS, the Employee desires to resign his employment with the
Company and his position as Director as of the effective date of the proposed
merger between Acquisition Holdings, Inc. or an affiliate thereof and the
Company (the "Effective Date");

          WHEREAS, the parties desire to set forth their respective rights and
obligations in respect of Employee's resignation from the above positions; and

          WHEREAS, the Company and Employee desire to enter into a consulting
agreement as set forth herein.

          NOW, THEREFORE, in consideration of the covenants and conditions set
forth herein, the parties, intending to be legally bound, agree as follows:

                                   AGREEMENT

          1.  Resignation.
              ----------- 

          (a) Employee hereby resigns from his employment with the Company with
effect on and as of the Effective Date.  It is agreed by the parties that, on
and as of the Effective Date, all rights and obligations of Employee and the
Company with respect to such employment shall terminate.

          (b) Employee hereby resigns as Director of the Company with effect on
and as of the Effective Date.

          2.  Consulting Services.  For a period of three (3) years after the
              -------------------                                            
Effective Date, Employee agrees to make
<PAGE>
 
himself available at reasonable times and locations (taking necessary account of
Employee's business commitments) to perform consulting services as reasonably
requested by the Company provided, (i) the Employee shall be given at least 48
hours prior written notice of the requested services, (ii) all such consulting
services shall be rendered in The City of New York and (iii) Employee shall not
be required to devote more than 10 hours per month to the business of the
Company.  All consulting services rendered to the Company by Employee shall be
performed as an independent contractor, and Employee shall not for any purpose
be deemed to be an employee of the Company.

          3.  Benefits.
              -------- 

          (a) Payment.  In consideration of the agreements of Employee herein
              -------                                                        
and without diminution because of the ability or inability of Employee to
perform any consulting services that may be requested by the Company, the
Company agrees to pay Employee (or his assigns or, in the event of his death,
his executor) the aggregate sum of three million two hundred ten thousand two
hundred ninety dollars ($3,210,290), less applicable withholdings for federal,
state and local taxes, to be paid as follows: (i) $1,550,000 shall be paid on
the Effective Date and (ii) $276,715 shall be paid on each January 1, April 1,
July 1, and October 1, commencing on the first such day that occurs at least one
month following the Effective Date and ending with the sixth such payment.  Any
tax liability incurred by Employee in respect of consideration received
hereunder hereof shall be borne by him.  The parties hereto agree that (x)
$722,000 of the aggregate amount payable hereunder shall be allocated to
severance payments; (y) $300,000 shall be allocated as a pro rata bonus for the
fiscal year ending February 28, 1998; and (z) $2,188,290 of the aggregate amount
payable hereunder shall be allocated to Employee's covenant not to compete in
Section 6 herein.

          (b) Health Insurance.  For the three (3) year period commencing on the
              ----------------                                                  
Effective Date, Employee and the members of his immediate family shall be
entitled to participate in and receive benefits under: (i)  ATC Management
Inc.'s health coverage plan with Unicare or any health insurance plan
subsequently adopted by the Company in its place; and (ii) the Executive
Supplement Plan to ATC Management Inc.'s health coverage plan with Unicare as
long as the Company is able to obtain coverage for Employee under the
supplemental plan; provided, that, the Company shall use commercially reasonable
                   --------  ----                                               
efforts to maintain substantially similar coverage during the term of this
Agreement.  During such period, Employee shall pay all premiums, deductibles and
other charges arising out of or associated with the coverage of Employee and his
immediate family under the insurance plans described in clauses (i) and (ii)
hereof; provided, that, such premiums, deductibles and other charges do not
        --------  ----                                                     
increase

                                       2
<PAGE>
 
disproportionately for Employee as compared with other senior executives of the
Company.

          (c) Car Lease.  On the Effective Date, Employee shall return to the
              ---------                                                      
Company the BMW automobile leased by the Company and used by the Employee.

          4.  Expenses.  All reasonable expenses incurred by Employee in
              --------                                                  
connection with the provision of consulting services requested hereunder,
including for airfare, hotel accommodations, meals and the like, shall be
reimbursed by the Company within seven (7) days after presentation by Employee
of receipts and other supporting documentation, provided that such expense had
been approved in advance by the Company.

          5.  No Solicitation of Employees.  Employee hereby represents and
              ----------------------------                                 
warrants that he has not solicited for employment or induced any person employed
by the Company to terminate employment during the sixty-day period preceding the
date hereof.

          6.  Covenant Not to Compete.
              ----------------------- 

          (a) Employee hereby covenants and agrees that Employee shall not, for
a period of three (3) years after the Effective Date, alone or in conjunction
with any other person or entity, whether as a principal, agent, stockholder,
director, officer, manager, trustee, representative, employee, executive or
consultant or in any other capacity, for whatever reason, directly or
indirectly: (i) compete or assist any person or entity in competing with the
Company in all aspects of the business as conducted by the Company on the
Effective Date in any manner in the United States, except as permitted in
clauses (iii) and (iv) below; provided, that, upon written notice by the Company
                              --------  ----                                    
of Employee's breach of this Section 6(a)(i), Employee shall have 10 (ten)
business days from the date of notice to cure any such breach; (ii) request or
cause any person employed by the Company on or after the date hereof to
terminate employment; (iii) compete or assist any person or entity in competing
with ATC InSys Technology Inc. ("InSys") or 3D Information Services Inc. ("3D")
or assist any person or entity in competing with InSys or 3D anywhere within the
legal boundaries of the State of New Jersey; or (iv) solicit on behalf of
himself or any other person or entity, within The City of New York, any of the
following customers of InSys:  (A) J.P. Morgan & Co. Incorporated, (B) Merrill,
Lynch & Co. (C) The Long Island Rail Road Co. and (D) The Chase Manhattan Bank;
                                                                               
provided, however, that the immediately preceding clause (iv) shall apply only
- --------  -------                                                             
to products or services that are competitive with those of InSys.  This Section
6 shall not be deemed to prohibit the Employee from owning up to 5% of the
outstanding voting securities of any issuer whose securities are listed or
traded on a U.S. national stock exchange, the

                                       3
<PAGE>
 
Nasdaq National Market System or a comparable foreign exchange or system.

          (b) If the scope of any restriction contained in this Agreement is too
broad to permit enforcement of such restriction to its fullest extent, then such
restriction shall be enforced to the maximum extent permitted by law, and
Employee hereby consents and agrees that such scope may be judicially modified
accordingly in any proceeding brought to enforce such restriction.  Employee
acknowledges and agrees that the covenants contained herein are necessary for
the protection of the Company's legitimate business interests and are reasonable
in scope and content.  Employee further acknowledges and understands that the
remedy at law for any breach by him of this Section 6 will be inadequate, and
that the damages flowing from such breach are not readily susceptible to being
measured in monetary terms.  Accordingly, it is acknowledged that upon
Employee's violation of any provision of this Section 6, the Company shall be
entitled to immediate injunctive relief and may obtain a temporary order
restraining any threatened or further breach.  Nothing in this Section 6 shall
be deemed to limit the Company's remedies at law or in equity for any breach by
Employee of any of the provisions of Section 6 which may be pursued or availed
of by the Company.

          7.  Release.  The Company hereby releases the Employee and the
              -------                                                   
Employee hereby releases the Company and its affiliates and its and their
present and former stockholders, directors, officers, employees, agents,
attorneys, successors and assigns (together, the "Company Released Parties"),
from any and all claims that each of the Employee or the Company Released
Parties has or may have arising in any way out of Employee's employment with the
Company and service as Director and the cessation thereof, including, but not
limited to, any and all claims each of the Employee or the Company had, has or
may have with respect to the Compensation.  Notwithstanding the above, this
provision is not intended to release any claims that may arise after the date
Employee executes this Agreement, including claims to enforce this Agreement.

          8.  Retained Property.  Employee represents that he has returned all
              -----------------                                               
property of the Company in his possession, including but not limited to credit
cards, security key cards, telephone cards, car service cards, computer software
or hardware, company identification cards, Company records and copies of
records, correspondence and copies of correspondence and other books or manuals
issued by the Company.  Employee also warrants that he has no debts to or loans
from the Company.  Notwithstanding the foregoing, Employee shall have the right
to retain (i) duplicate photocopies of books and records of the Company that do
not fall within the category of "Confidential Information" (as defined below)
and (ii) all

                                       4
<PAGE>
 
personal property of the Employee located on the premises of the Company.

          9.  Confidentiality.  Employee acknowledges that he has had and may in
              ---------------                                                   
the performance of consulting services hereunder continue to have access to
Confidential Information (as hereinafter defined) of the Company.  Employee
agrees not to disclose, communicate or divulge to, or use for the direct or
indirect benefit of, any person (including Employee), firm, association or other
entity (other than the Company or its affiliates) any Confidential Information.
"Confidential Information" includes, but is not limited to, business methods,
business policies, procedures, techniques, research or development projects or
results, trade secrets (which Employee agrees include the Company's customer and
prospective customer lists), pricing policies, business plans, computer
software, intellectual property, and other such information not otherwise
available to the general public, unless the information is disclosed to Employee
without confidential or proprietary restriction by the Company or a third party
who rightfully possesses the information (without confidential or proprietary
restriction) and did not learn of it, directly or indirectly, from the Company.
If any person (including any government employee) requests the disclosure or
release of Confidential Information, Employee shall (i) promptly notify the
Company of such request so that the Company may pursue any available remedies to
prevent the disclosure or release of such Confidential Information and (ii)
furnish the Company a copy of all written materials pertaining to such request
for Confidential Information as the Company shall deem appropriate.

          10. No Claims.  Employee represents and warrants that he has not
              ---------                                                   
filed any charges, claims or complaints against the Company Released Parties,
and he represents and warrants that he will not initiate or voluntarily
participate or assist in any charge, claim, or complaint against the Company
Released Parties, it being understood that this provision does not affect
Employee's right to enforce this Agreement, or legal obligation, if any, to
appear as a witness if subpoenaed for examination before trial or subpoenaed for
trial or hearing or, if required, to provide information to the Equal Employment
Opportunity Commission or to an equivalent state or local administrative agency
in response to a demand for information.

          11. Benefits Terminated.  Employee acknowledges that he is not
              -------------------                                       
entitled to receive benefits from the Company other than as set forth in Section
3 of this Agreement, except for any vested benefits to which Employee is
entitled in the Company's 401(k) Plan and except for any other benefits afforded
Employee by applicable law.

                                       5
<PAGE>
 
          12. No Inducements.  Employee warrants that he is entering into this
              --------------                                                  
Agreement voluntarily, and that, except as set forth herein, no promises or
inducements for this Agreement have been made, and he is entering into this
Agreement without reliance upon any statement or representation by any of the
Company Released Parties or any other person, concerning any fact material
hereto.

          13. Integration.  This Agreement constitutes the entire agreement
              -----------                                                  
between the parties with respect to the subject matter hereof, and supersedes
any and all prior agreements or understandings between the parties arising out
of or relating to the Employee's employment and the cessation thereof.  This
Agreement may only be changed by written agreement executed by the parties.

          14. Governing Law.  This Agreement shall be governed by the laws of
              -------------                                                  
the State of New York, without giving effect to the conflicts of law principles
thereof.

                                       6
<PAGE>
 
          IN WITNESS WHEREOF, the parties hereto have executed this Agreement as
of the day and year first above written.

                                     ATC GROUP SERVICES INC.
 

                                     -----------------------------------
                                     By:
        
                                     Name:
 
                                             
                                     EMPLOYEE
 
                                     

                                     -----------------------------------
                                     Morry F. Rubin

                                       7


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