HYDROCHEM INDUSTRIAL SERVICES INC
8-K, 1999-01-20
SERVICES, NEC
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                                  United States
                       Securities and Exchange Commission
                             Washington, D.C. 20549


                                    FORM 8-K

                                 CURRENT REPORT


     Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934

                Date of earliest event reported January 5, 1999
                        Date of Report January 20, 1999


                     HYDROCHEM INDUSTRIAL SERVICES, INC. (*)
             (Exact name of registrant as specified in its charter)



            Delaware                     333-34323                75-2503906
(State or other jurisdiction of     (Commission File         (I.R.S. Employer
 incorporation or organization)         Number)           Identification Number)


       900 Georgia Avenue
        Deer Park, Texas                                          77536
(Address of principal executive offices)                        (Zip Code)


                                 (713) 393-5600
              (Registrant's telephone number, including area code)


















- --------------------------------------------------------------------------------


*  HydroChem  International,  Inc.,  a direct and  wholly  owned  subsidiary  of
HydroChem  Industrial  Services,  Inc., is a  Co-Registrant.  It is incorporated
under the laws of the State of Delaware and its I.R.S.  Employer  Identification
Number is 75-2512100.

           

<PAGE>



Item 2.  Acquisition or Disposition of Assets.

        On January 5, 1999, HydroChem Industrial Services,  Inc. (the "Company")
acquired  substantially  all of the assets and assumed  certain  liabilities  of
Valley Systems, Inc., a Delaware corporation,  and Valley Systems of Ohio, Inc.,
an Ohio corporation  (collectively "Valley").  The acquisition,  effective as of
January 1, 1999,  was pursuant to the terms and  conditions of a Second  Amended
and Restated Asset Purchase  Agreement dated as of September 8, 1998. The assets
acquired consisted primarily of (i) accounts  receivable,  (ii) property,  plant
and equipment, (iii) intangibles, including customer agreements, customer lists,
and facility leases, and (iv) other operating assets. The Company intends to use
these assets in the operation of its existing  industrial  cleaning business and
the  industrial   cleaning  business  acquired  from  Valley.  In  this  regard,
substantially  all Valley  employees at the time of closing  accepted  offers of
employment from the Company.  The purchase price for the acquired assets,  which
is subject to certain post closing adjustments,  was approximately $29.8 million
in cash of which $4 million was deposited into escrow. In addition,  the Company
assumed  approximately  $2.3 million in capital lease  obligations and paid $5.3
million in cash at closing to retire Valley's bank debt. The source of funds for
the purchase  price and the retirement of the Valley bank debt was a combination
of cash on hand and borrowings under the Company's credit facility.

Item 7.  Financial Statements and Exhibits.

        (a) Financial  statements  of the business  acquired will be filed as an
amendment to this Form 8-K within 60 days of this filing.

        (b) Pro forma  financial  information  will  be filed as an amendment to
this Form 8-K within 60 days of this filing.

        (c)  Exhibits.


Exhibit
Number               Description

10.1           Second Amended and Restated Asset Purchase Agreement by and among
               HydroChem  Industrial Services,  Inc., Valley Systems,  Inc., and
               Valley  Systems  of Ohio,  Inc.  dated as of  September  8, 1998.
               Pursuant to Item 601 of  Regulation  S-K,  the  Registrants  will
               furnish  any exhibit or schedule  thereto to the  Securities  and
               Exchange Commission upon request.

10.2           Escrow  Agreement  dated as of January  5, 1999  among  HydroChem
               Industrial Services,  Inc., Valley Systems,  Inc., Valley Systems
               of Ohio, Inc. and Bank One Texas, N. A.

99.1           Press release dated January 5, 1999 regarding the  acquisition of
               the operating  assets and  assumption of certain  liabilities  of
               Valley Systems, Inc. and Valley Systems of Ohio, Inc.


                                        2

<PAGE>



                                   SIGNATURES


        Pursuant to the  requirements  of the  Securities  Exchange Act of 1934,
each  Registrant  has duly  caused this report to be signed on its behalf by the
undersigned thereunto duly authorized.


                                       HYDROCHEM INDUSTRIAL SERVICES, INC.


Date: January 20, 1999                 By:  /s/ Selby F. Little, III
                                            ------------------------
                                                Selby F. Little, III
                                                Executive Vice President
                                                and Chief Financial Officer






                                       HYDROCHEM INTERNATIONAL, INC.


Date: January 20, 1999                 By:  /s/ Selby F. Little, III
                                            ------------------------
                                                Selby F. Little, III
                                                Executive Vice President
                                                and Chief Financial Officer



                                        3

<PAGE>



                                  EXHIBIT INDEX


10.1           Second Amended and Restated Asset Purchase Agreement by and among
               HydroChem  Industrial Services,  Inc., Valley Systems,  Inc., and
               Valley Systems of Ohio, Inc. dated as of September 8, 1998.

10.2           Escrow  Agreement  dated as of January  5, 1999  among  HydroChem
               Industrial Services,  Inc., Valley Systems,  Inc., Valley Systems
               of Ohio, Inc. and Bank One Texas, N. A.

99.1           Press release dated January 5, 1999 regarding the  acquisition of
               the operating  assets and  assumption of certain  liabilities  of
               Valley Systems, Inc. and Valley Systems of Ohio, Inc.


                                        4

<PAGE>




                                     SECOND
                              AMENDED AND RESTATED

                            ASSET PURCHASE AGREEMENT


                                  By and Among


                       HYDROCHEM INDUSTRIAL SERVICES, INC.

                                    as Buyer


                                       and


                          VALLEY SYSTEMS OF OHIO, INC.

                                   as a Seller

                                       and

                              VALLEY SYSTEMS, INC.

        as a Seller and Sole Stockholder of Valley Systems of Ohio, Inc.


<PAGE>


                                TABLE OF CONTENTS

Definitions...................................................................1

   affiliate..................................................................1
   Agreement..................................................................1
   Assets.....................................................................1
   Bill of Sale, Assignment and Assumption Agreement..........................2
   Board......................................................................2
   Business Property Rights...................................................2
   Buyer......................................................................2
   Buyer Indemnitees..........................................................2
   Buyer=s Ceiling Amount.....................................................2
   CERCLA.....................................................................2
   Claim......................................................................2
   Closing....................................................................2
   Closing Balance Sheet......................................................2
   Closing Date...............................................................2
   Closing Financial Statements...............................................2
   Closing Schedules..........................................................2
   Code.......................................................................2
   control....................................................................2
   Customer...................................................................2
   Delivery Date..............................................................2
   Employee...................................................................2
   Encumbrances...............................................................2
   Environment................................................................3
   Environmental Contamination................................................3
   Environmental Due Diligence Review.........................................3
   Environmental Law..........................................................3
   Environmental Liabilities..................................................3
   Environmental Remediation..................................................3
   ERISA......................................................................3
   Escrow Agent...............................................................3
   Escrow Agreement...........................................................3
   Escrow Fund................................................................3
   Exchange Act...............................................................3
   Expenses...................................................................3
   Facilities.................................................................3
   Former Facilities..........................................................3
   Financial Statements.......................................................3
   Floor Amount...............................................................4
   fraud......................................................................4
   GAAP.......................................................................4

                                       i
<PAGE>

   Governmental Body..........................................................4
   Hazardous Materials........................................................4
   HSR Act....................................................................4
   Indemnified Party..........................................................4
   Indemnifying Party.........................................................4
   knowledge..................................................................4
   Leases.....................................................................4
   Legal Requirement..........................................................4
   Losses.....................................................................5
   material...................................................................5
   Order......................................................................5
   Person.....................................................................5
   Preliminary Schedules......................................................5
   Proceeding.................................................................5
   Proxy Materials............................................................5
   Purchase Price.............................................................5
   Receivables Guaranty.......................................................5
   Release....................................................................5
   Rules......................................................................5
   Schedules..................................................................5
   SEC........................................................................5
   SEC Reports................................................................5
   Securities Act.............................................................5
   Seller.....................................................................6
   Seller=s Ceiling Amount....................................................6
   Stockholders...............................................................6
   Superior Takeover Proposal.................................................6
   Termination Date...........................................................6
   Third Party................................................................6
   Third Party Claim..........................................................6
   Threatened.................................................................6
   VSI........................................................................6
   WARN.......................................................................6

1.   Purchase and Sale of Assets; Assumption of Specified Liabilities.........6

   1.1    Agreement to Purchase and Sell......................................6
   1.2    Purchase Price; Payment............................................10
   1.3    Assumption of Specified Liabilities................................10
   1.4    Non-Assumption of Certain Liabilities..............................11
   1.5    Stockholder Approval; Voting.......................................12
   1.6    Closing............................................................13
   1.7    Delivery of Schedules..............................................13
   1.8    Allocation of Purchase Price.......................................13

                                       ii
<PAGE>

   1.9    Closing Balance Sheet .............................................14

2.   Representations and Warranties of Seller and VSI........................15

   2.1    Existence; Good Standing; Corporate Authority; Compliance With Law.15
   2.2    Authorization, Validity and Effect of Agreements...................16
   2.4    Affiliated Entities................................................17
   2.5    Jurisdictions......................................................17
   2.6    Records............................................................17
   2.7    Bank Accounts......................................................17
   2.8    Financial Statements...............................................18
   2.9    Undisclosed Liabilities............................................19
   2.10   Absence of Certain Changes or Events...............................19
   2.11   Taxes..............................................................20
   2.12   Real Property......................................................21
   2.13   Personal Property..................................................21
   2.14   Title to Property; Encumbrances....................................21
   2.15   Insurance..........................................................22
   2.16   Business Property Rights...........................................22
   2.17   Collective Bargaining Agreements...................................23
   2.18   Employees..........................................................24
   2.19   Other Contracts....................................................25
   2.20   No Breach or Default...............................................25
   2.21   Litigation.........................................................25
   2.22   Accounts Receivable................................................26
   2.23   Inventories and Supplies...........................................26
   2.24   Environmental Matters..............................................26
   2.25   Customers and Suppliers............................................27
   2.26   No Brokers.........................................................28
   2.27   Indemnities and Guaranties.........................................28
   2.28   No Misrepresentation or Omission...................................28
   2.29   Survival of Representations and Warranties.........................28

3.   Representations and Warranties of Buyer.................................28

   3.1    Existence; Good Standing; Corporate Authority; Compliance With Law.28
   3.2    Authorization, Validity and Effect of Agreements...................29
   3.3    Survival of Representations and Warranties.........................30

4.   Indemnification.........................................................30

   4.1    Indemnification by Seller and VSI..................................30
   4.2    Indemnification by Buyer...........................................32
   4.3    Conditions of Indemnification......................................32

                                      iii
<PAGE>

   4.4    Monetary Limits of Indemnification.................................34
   4.5    Environmental Remediation..........................................36

5.   Other Covenants and Agreements..........................................37

   5.1    Guaranty of Receivables............................................37
   5.2    Restrictive Covenants..............................................37
   5.3    Escrow.............................................................39
   5.4    Conduct of the Business............................................42
   5.5    Due Diligence; Access to Information and Customers.................43
   5.6    Acquisition Proposals..............................................45
   5.7    Public Announcements...............................................46
   5.8    Notification of Certain Matters....................................46
   5.9    Best Efforts.......................................................46
   5.10   Execution of Additional Documents..................................47
   5.11   Fees and Expenses..................................................47
   5.12   Limitation of Liability............................................47
   5.13   HSR Act Filings....................................................48
   5.14   Employees..........................................................48
   5.15   Dispute Resolution.................................................48

6.   Conditions of Closing...................................................49

   6.1    Buyer's Conditions to Closing......................................49
   6.2    Seller's and VSI's Conditions to Closing...........................52

7.   Termination and Abandonment.............................................54

   7.1    Reasons for Termination............................................54
   7.2    Procedure Upon and Effect of Termination...........................55

8.   Miscellaneous...........................................................55

8.1     Notices..............................................................55
   8.2    Binding Effect; Benefits...........................................56
   8.3    Entire Agreement...................................................56
   8.4    Governing Law......................................................57
   8.5    Survival...........................................................57
   8.6    Counterparts.......................................................57
   8.7    Headings...........................................................58
   8.8    Waivers............................................................58
   8.9    Incorporation of Exhibits and Schedules............................58
   8.10   Severability.......................................................58
   8.11   Assignability......................................................58

                                       iv
<PAGE>

   8.12   Drafting...........................................................59
   8.13   References.........................................................59
   8.14   Calendar Days, Weeks and Months....................................59
   8.15   Gender; Plural and Singular........................................59
   8.16   Cumulative Rights..................................................59
   8.17   No Implied Covenants...............................................59
   8.18   Attorneys' Fees....................................................59
   8.19   Indirect Action....................................................59

SCHEDULES
EXHIBITS
EXHIBIT A BILL OF SALE, ASSIGNMENTANDASSUMPTION AGREEMENT
EXHIBIT B GUARANTY AGREEMENT
EXHIBIT C ESCROW AGREEMENT
EXHIBIT D SELLER=S OPINION
EXHIBIT E BUYER=S OPINION










                                       v
<PAGE>


                                     SECOND
                              AMENDED AND RESTATED

                            ASSET PURCHASE AGREEMENT

         This Second Amended and Restated  Asset  Purchase  Agreement is entered
into as of the 8th day of  September  1998,  by and among  HydroChem  Industrial
Services,  Inc.,  a Delaware  corporation  ("Buyer"),  Valley  Systems,  Inc., a
Delaware   corporation  ("VSI")  and  Valley  Systems  of  Ohio,  Inc.  an  Ohio
corporation and wholly-owned subsidiary of VSI ("Seller").

         WHEREAS,  Buyer and VSI have entered into that certain  Asset  Purchase
Agreement dated September 8, 1998,  subsequently amended by that certain Amended
and  Restated  Asset  Purchase  Agreement  dated as of  September 8, 1998 (as so
amended and restated, the "Purchase Agreement"); and

         WHEREAS,  the assets intended to be purchased  pursuant to the Purchase
Agreement  (other than certain  assets which are owned by VSI) are the assets of
Seller  and the  obligations  and  liabilities  intended  to be assumed by Buyer
pursuant to the Purchase Agreement are the obligations and liabilities of Seller
as well as VSI; and

         WHEREAS,  VSI is willing to be jointly and severally  responsible  with
Seller for any  obligations  of Seller  which have arisen or may arise under the
Purchase Agreement; and

         WHEREAS,  the parties  hereto  desire to further  amend and restate the
Purchase Agreement to modify the provisions relating to the determination of the
Closing Date and to make such other modifications as are provided for herein.

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

                                   Definitions

         For purposes of this Agreement,  the following terms have the following
meanings.

         "affiliate"--as defined in Section 4.1.

         "Agreement"--this Second Amended and Restated Asset Purchase Agreement.

         "Assets"--as defined in Section 1.1.1.

         "Bill of Sale, Assignment and  Assumption  Agreement" -- as defined  in
Section 1.1.3.

                                       1
<PAGE>

         "Board"--as defined in Section 1.5.

         "Business Property Rights"--as defined in Section 2.16.2.

         "Buyer"--HydroChem Industrial Services, Inc., a Delaware corporation.

         "Buyer Indemnitees"--as defined in Section 4.1.

         "Buyer's Ceiling Amount"--as defined in Section 4.4.2.

         "CERCLA"--the Comprehensive Environmental Response,  Compensation,  and
Liability Act of 1980 or any  successor  law, and  regulations  and rules issued
pursuant to that Act or any successor law.

         "Claim"--as defined in Section 4.3.

         "Closing"--as defined in Section 1.6.

         "Closing Balance Sheet"--as defined in Section 2.8.5.

         "Closing Date"--as defined in Section 1.6.

         "Closing Financial Statements"--as defined in Section 2.8.5.

         "Closing Schedules"--as defined in Section 1.7.
 .
         "Code"--the  Internal  Revenue  Code  of  1986,  as  amended,  and  the
regulations and rules issued pursuant thereto, as amended.

         "control"--as defined in Section 4.1.

         "Customer"--as defined in Section 5.2.1.

         "Delivery Date"--as defined in Section 1.7.

         "Employee"--any employee of VSI or Seller.

         "Encumbrances"--options,   indentures,   mortgages,  leases,  licenses,
restrictions (other than restrictions under applicable  securities laws), liens,
charges,  assessments,  pledges,  security interests,  adverse claims, equities,
limitations,  community property  interests,  conditions,  equitable  interests,
rights of first  refusal,  easements,  servitudes or other  encumbrances  of any
kind, including any restriction on use, voting, transfer,  receipt of income, or
exercise of any other attribute of ownership.

                                       2
<PAGE>

         "Environment"--soil,  land surface or subsurface strata, surface waters
(including navigable water, ocean waters,  streams,  ponds, drainage basins, and
wetlands), ground water, sediments, ambient air and natural resources.

         "Environmental Contamination"--as defined in Section 4.5.1.

         "Environmental Due Diligence Review"--as defined in Section 5.5.2.

         "Environmental  Law"--any  federal,  state,  or local law that  governs
protection  of  the  Environment,  including,  without  limitation,  those  laws
relating  to the  Release,  storage or handling of  Hazardous  Materials;  those
relating to the treatment, storage, transport,  disposal, or other management of
waste   materials  of  any  kind,  and  those  relating  to  the  protection  of
Environmentally sensitive areas.

         "Environmental   Liabilities"--any   costs,  damages,   expense,  fine,
penalty,  costs of investigation  and remediation or any other liability arising
from or under any Environmental Law.

         "Environmental Remediation"--as defined in Section 4.5.2.

         "ERISA"--the  Employee  Retirement  Income  Security Act of 1974 or any
successor  law, and  regulations  and rules  issued  pursuant to that Act or any
successor law.

         "Escrow Agent"--as defined in Section 5.3.1

         "Escrow Agreement"--as defined in Section 5.3.1.

         "Escrow Fund"--as defined in Section 1.2.

         "Exchange Act"--as defined in Section 2.8.1.

         "Expenses"--as defined in Section 5.11.

         "Facilities"--any  real  property,   leaseholds,   or  other  interests
currently  owned or  operated  by VSI or  Seller  and any  buildings,  plants or
structures currently owned or operated by VSI or Seller.

         "Former Facilities"--any real property,  leaseholds, or other interests
formerly  owned or  operated  by VSI or  Seller  and any  buildings,  plants  or
structures formerly owned or operated by VSI or Seller.

         "Financial Statements"--as defined in Section 2.8.4.

                                       3
<PAGE>

         "Floor Amount"--as defined in Section 4.4.

         "fraud"--fraud  perpetrated  or alleged to have been  perpetrated by an
Indemnifying Party against an Indemnified Party.

          "GAAP"--United   States  generally  accepted  accounting   principles,
     applied on a consistent basis.

         "Governmental Body"--any:

         (a)  nation,  state,  county,  city,  town, village, district, or other
jurisdiction of any nature;

         (b)  federal,  state,  local,  municipal, foreign, or other government;

         (c)  governmental  authority of any nature  (including any governmental
agency, branch, department, or entity and any court or other tribunal);

         (d)  multi-national organization or body; or

         (e)  body  exercising, or entitled  to  exercise,  any  administrative,
executive,  judicial,  legislative,  police,  regulatory, or taxing authority or
power of any nature.

         "Hazardous   Materials"--any   "hazardous   substance,"  "pollutant  or
contaminant,"  and  "petroleum"  and "natural  gas  liquids," as those terms are
defined or used in Section  101 of CERCLA,  and any other  substances  regulated
because  of their  effect  or  potential  effect  on public  health  and/or  the
Environment  including,  without limitation,  PCB's, lead paint,  asbestos,  and
radioactive materials.

         "HSR Act"--the  Hart-Scott-Rodino Antitrust Improvements Act of 1976 or
any successor law, and  regulations and rules issued pursuant to that Act or any
successor law.

         "Indemnified Party"--as defined in Section 4.3.

         "Indemnifying Party"--as defined in Section 4.3.

         "knowledge"--the  actual knowledge of any director,  officer,  regional
manager, or branch manager of VSI or Seller.

         "Leases"--as defined in Section 2.12.2.

         "Legal  Requirement"--any  applicable federal, state, local, municipal,
foreign,   international,   multinational,   or  other   administrative   order,
constitution,  law, ordinance, principle of common law, regulation,  statute, or
treaty.

                                       4
<PAGE>

         "Losses"--as defined in Section 4.1.

         "material"--an  item is  Amaterial@  if its  presence  or  absence,  as
required by the context,  would have a material  adverse effect upon the assets,
financial condition, results of operations,  business or affairs of a Person and
any  affiliates of such Person with whom such Person,  in accordance  with GAAP,
consolidates financial statements, taken as a whole.

         "Order"--any award, decision,  injunction,  judgment, order, ruling, or
verdict entered, issued, made, or rendered by any court,  administrative agency,
or other Governmental Body or by any arbitrator.

         "Person"--any   individual,   corporation   (including  any  non-profit
corporation),  general or limited partnership,  limited liability company, joint
venture, estate, trust, association,  organization, labor union, or other entity
or Governmental Body.

         "Preliminary Schedules"--as defined in Section 1.7.

         "Proceeding"--any action, arbitration,  audit, hearing,  investigation,
inquiry,   litigation,   or  suit  (whether  civil,  criminal,   administrative,
investigative,  or  informal)  commenced,  brought,  conducted,  or  heard by or
before, or otherwise involving, any Governmental Body or arbitrator.

         "Proxy Materials"--as defined in Section 1.5.

         "Purchase Price"--as defined in Section 1.2.

         "Receivables Guaranty"--as defined in Section 5.1.

         "Release"--any spilling,  leaking, emitting,  discharging,  depositing,
escaping,  leaching,  dumping, pumping, pouring, emptying, or injecting into the
Environment, whether intentional or unintentional.

         "Rules"--as defined in Section 5.15.

         "Schedules"--all Schedules to this Agreement, including the Preliminary
Schedules and the Closing Schedules.

         "SEC"--as defined in Section 2.8.2.
 .
         "SEC Reports"--as defined in Section 2.8.2.

                                       5
<PAGE>

         "Securities Act"--as defined in Section 2.8.1.

         "Seller"--Valley Systems of Ohio, Inc.,  an Ohio corporation (including
all prior subsidiaries).

         "Seller's Ceiling Amount"--as defined in Section 4.4.1.

         "Stockholders"--Rollins Investment Fund; Rollins Holding Company, Inc.;
and their respective affiliates.

         "Superior Takeover Proposal"--as defined in Section 5.6.

         "Termination Date"--as defined in Section 5.4.1.

         "Third Party"--as defined in Section 5.6.

         "Third Party Claim"--as defined in Section 4.3.

         "Threatened"--a  claim,  Proceeding,  dispute,  action, or other matter
will be deemed to have been "Threatened" if any demand,  notice or statement has
been made (orally, to the knowledge of Seller, or in writing).

         "VSI"--Valley  Systems,  Inc.,  a  Delaware  corporation (including all
prior subsidiaries).

         "WARN"--as defined in Section 2.18.7.

                                       6
<PAGE>

         1.       Purchase   and   Sale  of  Assets;   Assumption  of  Specified
                  Liabilities.

                  1.1      Agreement to Purchase and Sell.

                           1.1.1 Upon the terms and  subject  to the  conditions
                  set forth herein and upon the  representations  and warranties
                  made herein by each of the parties hereto,  at the Closing (as
                  such  term is  hereinafter  defined),  each of VSI and  Seller
                  respectively shall sell, grant, convey,  assign,  transfer and
                  deliver to Buyer,  and Buyer shall  purchase  and acquire from
                  each of VSI and  Seller  respectively,  all of the  respective
                  assets and properties of each of VSI and Seller of every kind,
                  nature and description  (wherever located),  as the same shall
                  exist on the Closing Date,  except those assets and properties
                  specifically  excluded  pursuant to Section 1.1.2 hereof (said
                  assets  and  properties  so to  be  sold,  granted,  conveyed,
                  transferred, assigned and delivered to Buyer being hereinafter
                  collectively  referred to as the "Assets").  Without  limiting
                  the generality of the foregoing, the Assets shall include, but
                  shall not be limited to, the following  respective  assets and
                  properties of each of VSI and Seller:

                                    (i) all  real  property,  interests  in real
                           property (including, without limitation, leases), and
                           structures and improvements located on real property,
                           and all the easements and uses which benefit any such
                           real property;

                                    (ii)    all notes and accounts receivable;

                                    (iii)    all     machinery,     inventories,
                           inventories   of   parts,    computers,    furniture,
                           furnishings, fixtures, office supplies and equipment,
                           automobiles, trucks, vehicles, returnable containers,
                           tools and parts, and work in process;

                                    (iv)  all  technology,   know-how,  designs,
                           devices, processes,  methods,  inventions,  drawings,
                           schematics, specifications,  standards, trade secrets
                           and other  proprietary  information,  and all patents
                           and  applications  therefor  and all  trademarks  and
                           trade names,  trademark and trade name registrations,
                           service   marks  and  service   mark   registrations,
                           copyrights   and   copyright    registrations,    the
                           applications   therefor  and  the  licenses  thereto,
                           together   with  the   goodwill   and  the   business
                           appurtenant thereto;

                                    (v)      all      drawings,      blueprints,
                           specifications, designs and data of Seller (including
                           drawings,  blueprints,  specifications,  designs  and
                           data of Seller  used by or in the  possession  of any
                           Third Party);

                                       7

<PAGE>

                                    (vi)  all   catalogues,   brochures,   sales
                           literature,  promotional  material and other  selling
                           material of Seller;

                                    (vii) all books and  records  and all files,
                           documents,  papers, agreements,  books of account and
                           other  records  pertaining  to the  Assets  or to the
                           business of Seller  which are located at the offices,
                           plants,   warehouses  or  other   locations  used  in
                           connection with the Assets;

                                    (viii)all  rights,  title  and  interest  of
                           Seller  under all  contracts,  agreements,  licenses,
                           leases,  sales  orders,  purchase  orders  and  other
                           commitments Buyer will assume pursuant to Section 1.3
                           hereof;

                                    (ix)  all  laboratory  equipment  (including
                           laboratory   notes   and   supplies)   and   chemical
                           inventories;

                                    (x)   all   lists   of   past,  present  and
                           qualified  prospective  customers of  the business of
                           Seller;

                                    (xi)  all  goodwill relating to the business
                           of Seller as a going concern, together with the right
                           to  represent  oneself  to third  parties  as the new
                           owner of such business;

                                    (xii) all  governmental and product licenses
                           and   permits,   approvals,    license   and   permit
                           applications   and  license   and  permit   amendment
                           applications;

                                    (xiii)all  claims  against  third   parties,
                           whether or not  asserted  and whether now existing or
                           hereafter arising,  related to the business of Seller
                           or the Assets  (including,  without  limitation,  all
                           claims  based on any  indemnities  or  warranties  in
                           favor of Seller relating to any of the Assets);

                                    (xiv) all other  assets  and rights of every
                           kind  and  nature,  real  or  personal,  tangible  or
                           intangible, of Seller;

                                    (xv)  all  cash  on  hand,   including  bank
                           accounts  (other than the Purchase  Price  depository
                           account) and temporary cash investments;

                                    (xvi) all  claims  for  refunds of taxes and
                           other  governmental  charges for periods ending on or
                           prior to the Closing Date; and

                                       8

<PAGE>

                                    (xvii)all safe  deposit boxes and lockboxes,
                           as well as the contents thereof.

                           Without limiting the generality of the foregoing, the
                  Assets  shall,  except as set forth in Section  1.1.2  hereof,
                  include  all  assets  set  forth in a  detailed  list of fixed
                  assets  as of June 30,  1998,  prepared  from  the  accounting
                  records of VSI and Seller, indicating the respective assets of
                  VSI and Seller, and attached hereto as Schedule 1.1.1, and all
                  such assets as may have been  acquired by VSI or Seller  which
                  would be included on a list  prepared in like manner from such
                  accounting  records as of the  Closing  Date,  except any such
                  assets which may have been disposed of since June 30, 1998, in
                  the  ordinary  course of business on a basis  consistent  with
                  past practice.

                           1.1.2  Anything  herein  contained  to  the  contrary
                  notwithstanding,   the   following   respective   assets   and
                  properties of each of VSI and Seller are specifically excluded
                  from the Assets and shall be retained  respectively  by VSI or
                  Seller:

                                  (i)     claims   or   rights   against   third
                           parties relating to liabilities or obligations  which
                           are  not  expressly  assumed  by  Buyer  pursuant  to
                           Section  1.3  hereof;

                                  (ii)    rights   under   insurance    policies
                           (including   directors    and    officers   liability
                           insurance), including   rights  to  any  cancellation
                           value  on the Closing Date;

                                  (iii)   the  stock  books,  minute  books  and
                           other corporate  and  financial  books and records of
                           each of  VSI  and  Seller (but each of VSI and Seller
                           shall, upon request  by  Buyer  and,  after  Closing,
                           at  Buyer's expense, provide copies of such financial
                           books and records to Buyer);

                                  (iv)    all shares of capital stock of Seller;

                                  (v)     funds  held  in  respect  of  the  VSI
                           401(k) plan; and

                                  (vi)    any  prepaid  expenses or other assets
                           of  VSI  or  Seller  incurred  in connection  with or
                           resulting from:  (1)  the  negotiation,  preparation,
                           execution or performance of  this  Agreement  or  the
                           transactions contemplated  hereby; (2) any  insurance

                                       9

<PAGE>

                           policies not assumed by Buyer; (3) federal, state, or
                           local income or franchise  taxes;  (4)  severance pay
                           resulting from the  transactions contemplated by this
                           Agreement;  (5) stock  retention bonus resulting from
                           the  transactions  contemplated  by  this  Agreement;
                           (6) payments  to terminate  stock  options  under the
                           1991 Stock Option Plan.

                         1.1.3 Subject to Section 1.1.4 hereof,  at the Closing,
                each of VSI and Seller shall  execute and deliver to Buyer (i) a
                Bill of Sale, Assignment and Assumption  Agreement,  in the form
                attached  hereto as Exhibit  "A" (the "Bill of Sale,  Assignment
                and Assumption Agreement"), under the terms of which each of VSI
                and Seller  shall sell,  grant,  convey,  assign,  transfer  and
                deliver their  respective  portions of the Assets to Buyer,  and
                (ii) such other bills of sale, deeds,  instruments of assignment
                and other appropriate  documents as may be reasonably  requested
                by  Buyer in order to  carry  out the  intentions  and  purposes
                hereof.

                         1.1.4 Nothing in this  Agreement  shall be construed as
                an attempt or agreement to assign (i) any  contract,  agreement,
                license,  lease, sales order, purchase order or other commitment
                which is nonassignable without the consent of the other party or
                parties  thereto  unless such  consent  shall have been given or
                (ii) any  contract or claim as to which all the remedies for the
                enforcement  thereof  enjoyed by VSI or Seller would not pass to
                Buyer as an incident of the assignments  provided for hereby. In
                order,  however, that the full value of every contract and claim
                of the  character  described  in  clauses  (i) and  (ii) of this
                Section  1.1.4 and all claims and demands on such  contracts may
                be realized,  each of VSI and Seller shall,  by itself or by its
                agents,  at the request and expense and under the  direction  of
                Buyer,  until the entire Escrow Fund has been released  pursuant
                to Section 5.3 hereof, in the name of VSI or Seller or otherwise
                as Buyer shall  specify and as shall be permitted  by law,  take
                all such  action  and do or cause to be done all such  things as
                shall in the reasonable  opinion of Buyer be necessary or proper
                (x) in order that the rights and  obligations of each of VSI and
                Seller under such contracts  shall be preserved and (y) for, and
                to facilitate, the collection of the monies due and payable, and
                to become due and  payable,  to VSI or Seller in and under every
                such  contract  and claim and in respect of every such claim and
                demand,  and each of VSI and Seller  shall hold the same for the
                benefit of and pay the same over promptly to Buyer.

                1.2 Purchase Price;  Payment.  Upon the terms and subject to the
        conditions  set forth  herein,  in  reliance  upon the  representations,
        warranties, covenants and agreements of each of VSI and Seller contained
        herein,  and in exchange for the sale,  grant,  conveyance,  assignment,
        transfer and delivery of the Assets,  Buyer  agrees,  subject to Section
        1.9  hereof,  to pay to VSI  and  Seller  the  sum of  $29,800,771  (the
        "Purchase  Price"),  payable  at the  Closing  as  follows:  (i) by wire

                                       10

<PAGE>

        transfer of $25,800,771 in immediately available funds to VSI and Seller
        in such bank  accounts  as  designated  by Seller in writing to Buyer at
        least 24 hours prior to the Closing;  and (ii) by depositing  $4,000,000
        (the  "Escrow  Fund") with the Escrow  Agent to be held and  disposed of
        pursuant to the Escrow Agreement.

                1.3 Assumption of Specified Liabilities.  At the Closing, and as
        additional  consideration for the sale, grant,  conveyance,  assignment,
        transfer and delivery of the Assets, subject, however, to Sections 1.1.4
        and 1.4  hereof,  Buyer  shall  assume  and  agree to pay,  perform  and
        discharge when due only the following:

                         (i) those  liabilities  or  obligations of Seller which
                are listed on Schedule 1.3A hereof (which shall be the detail of
                the  liabilities  reflected in the balance sheet included in the
                Financial  Statements  dated  June 30,  1998 as  updated  to the
                Closing  Date  pursuant  to Section 1.9  hereof)  which  updated
                Schedule 1.3A shall  prevail in the event of a conflict  between
                the  Closing  Balance  Sheet  and  such  updated  Schedule  1.3A
                (depending  upon the category of the liability  being assumed by
                Buyer,  the parties shall mutually agree (as denoted in Schedule
                1.3A) whether (i) Buyer will pay the liability to the obligee on
                behalf of Seller up to the amount of the accrued liability, (ii)
                Buyer will pay the amount of the accrued  liability  directly to
                Seller and Seller  will pay the  liability  to the  obligee,  or
                (iii)  Buyer  will pay the  liability  to the  obligee up to the
                amount of the accrued liability) and

                         (ii) those liabilities and obligations of either of VSI
                or Seller which arise under the terms of a contract,  agreement,
                license,  lease, sales order, purchase order or other commitment
                which is listed on  Schedule  1.3B  hereof  (as  updated  to the
                Closing Date  pursuant to Section 1.9 hereof) or is not required
                by the last  sentence of this  Section  1.3(ii) to be so listed.
                Schedule 1.3B shall only list (x) master  service  agreements of
                Seller assumed by Buyer (y) agreements under which either VSI or
                Seller have indemnified or provided a guaranty to any Person and
                (z)  contracts,  agreements,  licenses,  leases,  sales  orders,
                purchase orders or other  commitments of Seller assumed by Buyer
                which involve  services or annual  payments to or from either of
                VSI or Seller in excess of $10,000; and

                         (iii) all liabilities and obligations of VSI and Seller
                incurred in the ordinary  course of business on or after January
                1, 1999 through the Closing Date.

                Subject to Sections 1.1.4 and 1.4 hereof, at the Closing,  Buyer
        shall  execute  and deliver to Seller the Bill of Sale,  Assignment  and
        Assumption  Agreement assuming the liabilities and obligations of Seller
        referred to in this Section 1.3.

                1.4  Non-Assumption  of  Certain   Liabilities.   Buyer  is  not

                                       11

<PAGE>

        assuming,  and shall not be deemed to have assumed,  any  liabilities or
        obligations of Seller or VSI of any kind or nature whatsoever, except as
        expressly provided in Section 1.3 hereof. Anything in Section 1.3 hereof
        or elsewhere herein to the contrary notwithstanding and without limiting
        the generality of the  foregoing,  it is hereby agreed that Buyer is not
        assuming,  and shall not be deemed to have  assumed,  any  liability and
        shall not have any  obligation  for or with respect to any  liability or
        obligation of VSI or Seller:

                         (i) under any  employee  benefit  plan of VSI or Seller
                other than any accrued liabilities specifically assumed by Buyer
                pursuant to Section 1.3 above;

                         (ii) in respect of (x) any sales,  use or excise taxes,
                income taxes,  taxes based on or measured by income or franchise
                taxes  attributable  to periods or events  prior to or ending on
                the Closing Date or (y) any sales,  use or excise taxes,  income
                taxes,  or  any  other  taxes,  legal,  accounting,   brokerage,
                finder's  fees, or other  expenses of whatsoever  kind or nature
                incurred  by  VSI  or  Seller  or  any  affiliate,  stockholder,
                director,  Employee  or  officer of VSI or Seller as a result of
                the consummation of the transactions  contemplated hereby (other
                than such  taxes,  fees and  expenses  which are  accrued in the
                ordinary course of business prior to Closing);

                         (iii)  arising  out of any action,  condition,  suit or
                proceeding  based upon an event occurring or a claim arising (x)
                prior to the Closing  Date or (y) after the Closing  Date in the
                case of claims in respect of products sold or services  provided
                by VSI or Seller prior to the Closing Date and  attributable  to
                acts  performed or omitted by VSI or Seller prior to the Closing
                Date,  provided,  however,  that  Buyer  shall  assume  any such
                liability  or  obligation  to the  extent  it has been  reserved
                against on the Closing Balance Sheet;

                         (iv) pursuant to existing loan  agreements  (other than
                payment  obligations assumed pursuant to Section 1.3 above), and
                all agreements executed in connection therewith;

                         (v) to any  present  or  former  shareholder,  officer,
                director  or  Employee  of VSI  or  Seller  (including,  without
                limitation,  for bonuses,  fringe benefits,  vacation or holiday
                pay,   wages  or  severance   pay,  but  excluding  any  accrued
                liabilities  specifically  assumed by Buyer  pursuant to Section
                1.3 above); or

                         (vi)  incurred  in  connection  with  the  negotiation,
                preparation,  execution or  performance of this Agreement or the
                transactions contemplated hereby.

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<PAGE>

                1.5 Stockholder  Approval;  Voting.  Seller,  acting through its
        board of  directors,  shall,  unless  there  exists a Superior  Takeover
        Proposal,  as soon as  practicable  after the date  hereof  (i) seek the
        written consent of its sole stockholder,  VSI,  approving this Agreement
        and all transactions  contemplated hereby. VSI, acting through its board
        of  directors  (the  "Board"),  shall,  unless  there  exists a Superior
        Takeover Proposal, as soon as practicable after the date hereof (i) seek
        to obtain the written consent of stockholders  owning not less than that
        number of shares of VSI capital stock required  under  applicable law in
        order to approve the transactions  contemplated  hereby;  (ii) recommend
        that such  stockholders  of VSI consent to the  approval and adoption of
        this  Agreement  and  all  transactions   contemplated   hereby;   (iii)
        distribute to its  stockholders  the  definitive  information  statement
        materials  with  respect  to the sale of the Assets in  accordance  with
        Regulation  14C under the Exchange  Act,  other  applicable  federal and
        state laws, (the "Proxy Materials");  (iv) use its reasonable efforts to
        obtain the necessary  approvals by VSI's  stockholders of this Agreement
        and all  transactions  contemplated  hereby;  and (v) will,  as the sole
        stockholder  of  Seller,   consent  in  writing,  with  respect  to  all
        outstanding  shares of capital  stock of Seller,  to the  execution  and
        delivery of, and consummation of the transactions  contemplated by, this
        Agreement  by  Seller.   Contemporaneously  herewith,  each  of  Rollins
        Investment  Fund and Rollins  Holding  Company,  Inc.,  has  executed an
        agreement  whereby  each of them has agreed to consent in writing,  with
        respect to all shares of capital stock of VSI respectively  beneficially
        owned by them, to the execution and delivery of, and consummation of the
        transactions  contemplated by, this Agreement by VSI unless there exists
        a Superior Takeover Proposal.

                1.6 Closing.  The closing of the purchase and sale of the Assets
        provided herein (the "Closing")  shall occur (i) at the office of Haynes
        and Boone,  LLP, 901 Main Street,  Suite 3100,  Dallas,  Texas 75202, at
        10:00 a.m.,  local time,  on January 5, 1999, or (ii) at such other time
        and place or on such  other date as VSI,  Seller and Buyer may  mutually
        agree  (such  date  and  time  of  Closing  being  herein   referred  to
        collectively  as the "Closing  Date").  Regardless of the actual Closing
        Date,  the  Closing  shall be deemed to have  occurred  as of 12:01 a.m.
        January 1, 1999.

                1.7 Delivery of Schedules and Exhibits.  Within twenty  business
        days of the date of this  Agreement,  VSI and  Seller  shall  deliver to
        Buyer all schedules  (other than Schedule 2.9,  which shall be delivered
        within  twenty-five  business  days of the date of this  Agreement)  and
        exhibits  to this  Agreement  (the  date of  delivery  of the last  such
        schedule or exhibit, including Schedule 2.9, being referred to herein as
        the  "Delivery  Date"),  such  schedules  being true and  correct in all
        material  respects at and as of the Delivery  Date (except for Schedules
        1.1.1 and 1.3A,  which  shall be true and  correct at and as of June 30,
        1998)  (collectively,  the  "Preliminary  Schedules").  The  Preliminary
        Schedules  shall be updated as  required  pursuant to Section 1.3 hereof
        and otherwise as necessary so as to be true and correct at and as of the
        Closing Date (collectively, as so updated, the "Closing Schedules"). The

                                       13

<PAGE>

        Closing  Schedules  shall be  delivered in  accordance  with Section 1.9
        hereof;  provided  that any  objection  by  Buyer to any of the  Closing
        Schedules delivered not later than fifteen days prior to Closing must be
        made by Buyer prior to Closing.  Each of the  Preliminary  Schedules and
        the Closing  Schedules  shall be in a form  reasonably  satisfactory  to
        Buyer.

                1.8 Allocation of Purchase  Price.  The  consideration  given by
        Buyer under this Agreement  (including without limitation the payment of
        the Purchase Price and the assumption of liabilities pursuant to Section
        1.3  hereof)  shall be  allocated  among the Assets in  accordance  with
        section 1060 of the Internal  Revenue Code of 1986, as amended,  and the
        regulations   thereunder.   A  schedule   setting  forth  such  proposed
        allocations  shall be prepared by Buyer and  delivered to Seller  within
        120 days following the Closing Date. The allocation as set forth on such
        schedule shall be reasonably determined by Buyer and shall be reasonably
        satisfactory  to  Seller.  Buyer,  VSI and  Seller  agree  to make  such
        allocation in filing their  respective tax returns or  declarations  for
        applicable United States income tax purposes.

                1.9      Closing Balance Sheet Adjustment.

                         1.9.1 Within 45 days  following the Closing  Date,  VSI
                and Seller,  with the reasonable  assistance and  cooperation of
                Buyer (including use of employees of Buyer who were employees of
                Seller immediately prior to Closing at no cost to Seller), shall
                prepare and deliver to Buyer the Closing  Balance  Sheet and the
                Closing  Schedules.  The Closing  Balance  Sheet and the Closing
                Schedules  shall be  prepared  from the books and records of VSI
                and Seller concerning their respective  businesses in accordance
                with  GAAP  on  a  basis   consistent  with  that  used  in  the
                preparation  of the  balance  sheet  included  in the  Financial
                Statements  dated  June 30,  1998.  Buyer,  with the  reasonable
                assistance and cooperation of VSI and Seller, shall have 30 days
                to review the Closing  Balance  Sheet and the Closing  Schedules
                after  receipt  thereof  from VSI and  Seller.  On or before the
                expiration of such 30-day period, Buyer shall deliver to VSI and
                Seller a written statement accepting or objecting to the Closing
                Balance Sheet and the Closing Schedules. In the event that Buyer
                shall object to the Closing Balance Sheet, the Closing Schedules
                or both, such statement shall include a detailed  itemization of
                Buyer's objections and its reasons therefor.  If no statement is
                delivered by Buyer to VSI and Seller within such 30-day  period,
                Buyer shall be deemed to have accepted the Closing Balance Sheet
                and the Closing Schedules.

                         1.9.2 In the event that Buyer  shall  timely  object to
                the Closing Balance Sheet,  Buyer, VSI and Seller shall promptly
                meet and in good  faith  attempt to resolve  such  objection  or
                objections.  Any of such  objections  which  cannot be  resolved
                between Buyer, VSI and Seller within 30 days following VSI's and

                                       14

<PAGE>

                Seller's  receipt of Buyer's  statement of  objections  shall be
                submitted to binding  arbitration  conducted by the  independent
                accounting  firm of Arthur Andersen LLP. In the event that Buyer
                shall  timely  object  to  any of the  Closing  Schedules,  such
                objection  shall be resolved in  accordance  with  Section  5.15
                hereof.

                         1.9.3 In the event that the net assets reflected on the
                Closing Balance Sheet,  after all of Buyer's  objections thereto
                shall  have been  resolved  in  accordance  with  Section  1.9.2
                hereof,  are greater or less than $5,353,593 (i.e. the amount of
                the net assets  reflected on the balance  sheet  included in the
                Financial  Statements  dated June 30, 1998),  then the amount of
                any such  excess or  deficiency  shall be paid to VSI and Seller
                (in  the  case  of  an  excess)  or  Buyer  (in  the  case  of a
                deficiency)  by  the  other  by  wire  transfer  of  immediately
                available United States funds within three business days of such
                resolution, receipt of Buyer's written acceptance of the Closing
                Balance  Sheet  or  expiration  of  Buyer's  30-day  period  for
                objection to the Closing Balance Sheet.

                           1.9.4 In  addition  to the net asset  adjustment  set
                forth in Section  1.9.3  hereof,  in the event that the  Closing
                Balance Sheet  reflects  assets which are not purchased by Buyer
                or  reflects  liabilities  which are not  assumed by Buyer,  the
                excess,  if any, of the aggregate amount of any such assets over
                the aggregate  amount of any such  liabilities  shall be paid to
                Buyer or, as the case may be, the  aggregate  amount of any such
                liabilities  over the aggregate  amount of any such assets shall
                be paid to VSI and Seller,  in either  case by wire  transfer of
                immediately  available United States funds within three business
                days  following  the  resolution  of Buyer=s  objections  to the
                Closing  Balance Sheet referred in Section 1.9.3 above,  receipt
                of Buyer=s  written  acceptance of the Closing  Balance Sheet or
                expiration  of  Buyer=s  30-day  period  for  objections  to the
                Closing Balance Sheet.


        2.  Representations  and  Warranties  of  Seller  and  VSI.  Subject  to
attachment  of the  Schedules as provided in Section 1.7 hereof,  VSI and Seller
hereby jointly and severally  represent and warrant to Buyer as follows  (Seller
and VSI  reserving the right to attach at the Delivery Date and update at and as
of the Closing Date  Schedules in addition to those called for herein and to add
references   thereto  in  the  following   warranties  and   representations  as
appropriate):

                2.1 Existence;  Good Standing;  Corporate Authority;  Compliance
        With Law. Each of VSI and Seller (i) is a corporation duly incorporated,
        validly existing and in good standing under the laws of its jurisdiction
        of incorporation; (ii) is duly licensed or qualified to do business as a
        foreign  corporation and is in good standing under the laws of any other
        jurisdictions  in which the character of the properties  owned or leased

                                       15

<PAGE>

        by it therein or in which the  transaction  of its  business  makes such
        qualification  necessary  except  where the  failure to be so  qualified
        would not be  material;  (iii)  has all  requisite  corporate  power and
        authority  to own  its  properties  and  carry  on its  business  as now
        conducted;  (iv) is not in material default with respect to any Order of
        any  Governmental  Body or  arbitration  board;  (v) is not in  material
        violation of any Legal Requirement to which it is subject;  and (vi) has
        obtained all material licenses, permits and other authorizations and has
        taken  all  actions   required  by  applicable   laws  or   governmental
        regulations in connection with its business as now conducted.

                2.2      Authorization, Validity and Effect of Agreements.

                         2.2.1 The execution and delivery of this  Agreement and
                all agreements and documents  contemplated  hereby by Seller and
                VSI,  and the  consummation  by each  of  Seller  and VSI of the
                transactions  contemplated  hereby, have been duly authorized by
                the Board and the board of directors  of Seller and,  except for
                the  approval of the  stockholders  of VSI and Seller,  no other
                corporate proceedings on the part of Seller or VSI are necessary
                to authorize  this Agreement and the  transactions  contemplated
                hereby.

                         2.2.2 This  Agreement  constitutes,  and all agreements
                and  documents  contemplated  hereby when executed and delivered
                pursuant  hereto for value received will  constitute,  the valid
                and legally binding obligations of Seller and VSI enforceable in
                accordance with their terms,  except that  enforceability may be
                limited by applicable  bankruptcy,  insolvency,  reorganization,
                fraudulent  transfer,   moratorium,   bulk  sales,   preference,
                equitable  subordination,  marshalling  or other similar laws of
                general  application  now or hereafter in effect relating to the
                enforcement of creditors'  rights  generally and except that the
                remedies of specific performance,  injunction and other forms of
                equitable   relief  are  subject  to  certain  tests  of  equity
                jurisdiction, equitable defenses and the discretion of the court
                before which any proceeding therefor may be brought.

                         2.2.3 The execution  and delivery of this  Agreement by
                each of Seller  and VSI does not,  and the  consummation  of the
                transactions  contemplated hereby by each of Seller and VSI will
                not,  except as set forth in Schedule 2.2 hereof (which Schedule
                2.2 will include  reference to compliance with the HSR Act), (i)
                require  the   consent,   approval  or   authorization   of,  or
                declaration,  filing or registration with, any Governmental Body
                or any Third  Party;  (ii)  result in the  breach of any term or
                provision  of, or constitute a default  under,  or result in the
                acceleration  of or  entitle  any party to  accelerate  (whether
                after  the  giving  of  notice or the lapse of time or both) any
                obligation under, or result in the creation or imposition of any
                Encumbrance  upon  any part of the  property  of  Seller  or VSI
                pursuant to any  provision of, any Order,  indenture,  mortgage,

                                       16

<PAGE>

                lease, license,  lien, or other agreement or instrument to which
                VSI or Seller is a party or by which either of them is bound; or
                (iii)  violate or conflict  with any  provision of the bylaws or
                the Certificate of  Incorporation of VSI or Seller as amended to
                the date hereof.

                2.3 Capitalization  and Ownership.  The authorized capital stock
        of VSI consists  solely of (i)  12,000,000  shares of common stock,  par
        value  $.01  per  share,  of  which  7,906,617  shares  and no more  are
        presently  issued and  outstanding  and (ii)  55,000  shares of Series C
        preferred  stock,  par value $0.10 per share, of which 55,000 shares and
        no more are presently issued and outstanding. All issued and outstanding
        shares of capital stock of Seller are owned  beneficially  and of record
        by VSI.  All of such  capital  stock of VSI and of Seller  has been duly
        authorized  and  validly  issued  and is fully  paid and  nonassessable.
        Except as set forth in Schedule  2.3B hereof,  there are no  outstanding
        rights,  warrants,  options,  subscriptions,  agreements or  commitments
        giving anyone any right to require VSI or Seller to sell or issue, or to
        require  VSI or the  Stockholders  to sell or  otherwise  transfer,  any
        capital stock or other securities of VSI or Seller.

                2.4  Affiliated  Entities.  Neither VSI nor Seller owns, nor has
        either of them owned since September 4, 1998, directly or indirectly,  a
        majority or controlling  interest in any  corporation  (other than VSI=s
        ownership of Seller),  business trust, joint stock company,  partnership
        or other business  organization or association  relating to the business
        operations of Seller.

                2.5  Jurisdictions.  Schedule 2.5 hereof  contains a list of all
        jurisdictions  in which each of VSI and Seller is presently  licensed or
        qualified to do business.  To the best knowledge of VSI and Seller,  VSI
        and  Seller  has  each  complied  in  all  material  respects  with  all
        applicable laws of each such  jurisdiction  and all applicable rules and
        regulations of each regulatory  agency  therein.  Neither VSI nor Seller
        (i) has been  denied  admission  to conduct  any type of business in any
        jurisdiction in which it is not presently  admitted as set forth in such
        Schedule  2.5,  (ii) has had its  license or  qualifications  to conduct
        business in any  jurisdiction  revoked or  suspended,  or (iii) has been
        involved  in  any   Proceeding   to  revoke  or  suspend  a  license  or
        qualification.

                2.6 Records. Each of VSI and Seller shall have delivered or made
        available to Buyer and its counsel on or prior to the Delivery Date true
        and  complete  copies  of its  respective  Certificate  or  Articles  of
        Incorporation,   bylaws,  minutes  of  all  meetings  of  directors  and
        shareholders  and  certificates  reflecting  all  actions  taken  by the
        directors or shareholders without a meeting,  partnership agreements and
        certificates, and other organizational documents, of VSI and Seller, and
        such documents are in full force and effect on the date hereof.

                                       17

<PAGE>

                2.7 Bank  Accounts.  Schedule  2.7 hereof sets forth the name of
        each bank, savings  institution or other Person with which VSI or Seller
        has  an  account,  lockbox  or  safe  deposit  box  and  the  names  and
        identification  of all Persons  authorized  to drawn  thereon or to have
        access thereto.

                2.8      Financial Statements.  

                         2.8.1 Since June 30, 1996,  the filings  required to be
                made by each of VSI and Seller under the Securities Act of 1933,
                as amended (the  "Securities  Act"), or the Securities  Exchange
                Act of 1934, as amended (the  "Exchange  Act"),  have been filed
                with  the  SEC as  required  by  each  such  law or  regulation,
                including all forms,  statements,  reports,  agreements  and all
                documents,  exhibits,  amendments and  supplements  appertaining
                thereto,  and  each  of VSI  and  Seller  have  complied  in all
                material  respects  with  all  applicable  requirements  of  the
                appropriate act and the rules and regulations thereunder.

                         2.8.2 VSI and Seller shall have made available to Buyer
                on or prior to the  Delivery  Date a true and  complete  copy of
                each report,  schedule,  registration  statement and  definitive
                proxy  statement  filed by VSI or Seller with the Securities and
                Exchange  Commission  (the  "SEC")  since  June 30,  1996  (such
                documents as filed,  and any and all amendments  thereto,  being
                collectively referred to herein as the "SEC Reports").

                         2.8.3 The SEC Reports, including without limitation any
                financial  statements or schedules included therein, at the time
                filed,  and all forms,  reports or other documents filed by each
                of VSI and Seller  with the SEC after the date  hereof,  did not
                and will not contain any untrue  statement of a material fact or
                omit to state a material fact  required to be stated  therein or
                necessary  to make  the  statements  therein,  in  light  of the
                circumstances under which they were made, not misleading.

                         2.8.4 The audited consolidated financial statements and
                unaudited  interim  financial   statements  of  VSI  and  Seller
                included  in  the  SEC  Reports  (collectively,  the  "Financial
                Statements")  have been prepared,  and the audited  consolidated
                financial  statements and unaudited interim financial statements
                of VSI and Seller as  included  in all  forms,  reports or other
                documents  filed  with the SEC  after  the date  hereof  will be
                prepared in  accordance  with GAAP  (except as may be  indicated
                therein  or in the notes  thereto  and  except  with  respect to
                unaudited  statements  as  permitted  by Form  10-Q) and  fairly
                present in all material  respects the financial  position of VSI
                and Seller as of the respective  dates thereof or the results of
                operations and cash flows for the respective periods then ended,
                as the  case  may be,  subject,  in the  case  of the  unaudited
                interim  financial  statements,   to  normal,   recurring  audit
                adjustments.

                                       18

<PAGE>

                         2.8.5 As soon as  reasonably  practical  following  the
                Closing Date, VSI and Seller (with the reasonable assistance and
                cooperation  of Buyer and employees of Buyer who were  employees
                of Seller immediately prior to Closing, such assistance to be at
                no cost to VSI or Seller) will cause to be prepared  each of the
                following  with  respect  to VSI  and  Seller,  as at and of the
                Closing  Date:  an  audited   consolidated  balance  sheet  (the
                "Closing Balance Sheet"), an audited  consolidated  statement of
                operations,  an audited consolidated statement of cash flows and
                an  audited  consolidated   statement  of  stockholders=  equity
                (collectively  with the  Closing  Balance  Sheet,  the  "Closing
                Financial Statements"),  which Closing Financial Statements will
                be prepared in accordance  with GAAP on a basis  consistent with
                the Financial Statements. In addition, the Closing Balance Sheet
                shall  be in the  form  of the  balance  sheet  included  in the
                Financial  Statements  dated June 30, 1998. One half of the fees
                paid to independent accounting firms incurred in connection with
                the audit and  preparation of the Closing  Financial  Statements
                shall be paid by VSI and Seller and the other half shall be paid
                by Buyer.

                2.9  Undisclosed  Liabilities.  Neither  VSI nor  Seller has any
        liabilities or obligations  (whether  absolute,  accrued,  contingent or
        otherwise)  of  a  nature   required  by  GAAP  to  be  reflected  in  a
        consolidated   balance  sheet,   except   liabilities,   obligations  or
        contingencies  (i) that are accrued or  reserved  against in the audited
        consolidated  financial statements of VSI and Seller or reflected in the
        notes  thereto for the year ended June 30, 1998,  (ii) have been accrued
        or been  reserved  against  since June 30,  1998,  and are  disclosed on
        Schedule 2.9 or (iii) that were  incurred  after June 30,  1998,  in the
        ordinary  course of business and would not have a material effect on VSI
        or Seller.

                2.10 Absence of Certain Changes or Events.  Since June 30, 1998,
        neither VSI nor Seller has:

                         (i) incurred  any  obligation  or  liability  (fixed or
                contingent),   except  normal  trade  or  business   obligations
                incurred in the ordinary  course of business and consistent with
                past practice,  none of which is materially adverse,  and except
                in  connection   with  this   Agreement  and  the   transactions
                contemplated hereby;

                         (ii)  discharged or satisfied any  Encumbrance  or paid
                any obligation or liability (fixed or contingent), other than in
                the  ordinary  course  of  business  and  consistent  with  past
                practice;

                         (iii)   mortgaged,   pledged   or   subjected   to  any
                Encumbrance any of its assets or properties (other than inchoate
                real  estate  tax  liens  not  due  and   payable,   mechanic's,

                                       19

<PAGE>

                materialman's   and  similar  statutory  liens  arising  in  the
                ordinary   course  of  business  and  purchase   money  security
                interests  arising  as a  matter  of law  between  the  date  of
                delivery and payment);

                         (iv) transferred,  leased or otherwise  disposed of any
                of its assets or properties  except for a fair  consideration in
                the  ordinary  course  of  business  and  consistent  with  past
                practice  or,  except in the  ordinary  course of  business  and
                consistent   with  past   practice,   acquired   any  assets  or
                properties;

                         (v) cancelled or compromised any debt or claim,  except
                in the  ordinary  course of business  and  consistent  with past
                practice;

                         (vi)   waived or released any rights of material value;

                         (vii) except pursuant to those contracts  listed on the
                Schedules  hereof,  transferred  or granted any rights under any
                concessions,  leases, licenses, agreements, patents, inventions,
                trademarks,  trade names,  service  marks or  copyrights or with
                respect to any know-how;

                         (viii)  made or  granted  any wage or  salary  increase
                applicable   to  any  group  or   classification   of  Employees
                generally,  entered into any  employment  contract with, or made
                any loan to, or entered  into any  material  transaction  of any
                other  nature  with,  any  officer  or  Employee,  except in the
                ordinary  course  of  business  or as  listed  on the  Schedules
                hereof;

                         (ix)   entered  into  any   transaction,   contract  or
                commitment,  except (a) contracts listed on the Schedules hereof
                and (b) this Agreement and the transactions contemplated hereby;
                or

                         (x) suffered any  casualty  loss or damage  (whether or
                not such loss or damage  shall have been  covered by  insurance)
                which  affects in any  material  respect  its ability to conduct
                business.

                2.11 Taxes. Each of VSI and Seller (i) has duly and timely filed
        or caused to be filed all federal,  state, local and foreign tax returns
        (including,   without  limitation,   consolidated  and/or  combined  tax
        returns)  required  to be filed by it  prior  to the date  hereof  which
        relate to it or with  respect  to which it or the  Assets  are liable or
        otherwise  in any way  subject;  (ii) has paid or fully  accrued for all
        taxes shown to be due and payable on such  returns  (which taxes are all
        the taxes due and  payable  under the laws and  regulations  pursuant to
        which such returns were filed);  and (iii) has properly  accrued for all
        such taxes accrued in respect of it or the Assets for periods subsequent
        to the periods  covered by such  returns.  No  deficiency  in payment of
        taxes for any period has been  asserted  by any taxing  body and remains


<PAGE>

                                       20
        unsettled  at the  date  hereof  and no  audits  are in  process  and no
        notification  of audit to begin has been  received  for which claims are
        unasserted.  The consolidated tax returns of VSI and Seller for tax year
        1995 have been audited by the Internal  Revenue  Service.  Copies of all
        federal,  state,  local and foreign income (or franchise) tax returns of
        VSI and  Seller  for tax  years  1996  and  thereafter  have  been  made
        available for inspection by Buyer.

                2.12     Real Property.

                         2.12.1  Schedule  2.12A  hereof   identifies  the  real
                property  owned,  either in whole or in part, by each of VSI and
                Seller.

                         2.12.2  Schedule  2.12B  hereof   identifies  the  real
                property  leased or  subleased  by each of VSI and  Seller  (the
                "Leases").  Neither  VSI nor Seller  has  received  any  written
                notification  that it is in default  with  respect to any of the
                Leases nor are there any  disputes  between any landlord and VSI
                or Seller with respect to the Leases that would affect the right
                of VSI or Seller, as the case may be, to remain in possession or
                otherwise affect the current use of the property leased.  Except
                as set forth in Schedule  2.12B  hereof,  each of VSI and Seller
                has performed all material  obligations required to be performed
                by it to date under,  and is not in material  default in respect
                of, any Lease, and no event has occurred which,  with due notice
                or lapse  of time or  both,  would  constitute  such a  material
                default. To the best of each of VSI's and Seller's knowledge, no
                other  party to any  Lease is in  material  default  in  respect
                thereof,  and no event has  occurred  which,  with due notice or
                lapse of time or both, would constitute such a default.

                         2.12.3 True and  complete  copies of all Leases and all
                title  reports,  surveys and other  leases  relating to the real
                property  owned by VSI or Seller shall have been made  available
                to Buyer  or its  representatives  on or  prior to the  Delivery
                Date.

                2.13 Personal  Property.  The machinery,  equipment,  furniture,
        fixtures and other tangible personal  property owned,  leased or used by
        each of VSI and Seller are  sufficient  and  adequate  to carry on their
        respective  businesses as presently  conducted and are in good operating
        condition  and repair and are  suitable  for the purposes for which they
        are used, normal "wear and tear" excepted.

                2.14 Title to Property;  Encumbrances.  Either VSI or Seller has
        good, valid and, in the case of real properties, marketable title to all
        the  properties  and  assets  shown  on  the  Financial   Statements  or
        thereafter  acquired,  including  the Assets  (except for (i)  inventory
        subsequently  sold  or  otherwise  disposed  of for  fair  value  in the
        ordinary course of business consistent with past practice, (ii) accounts
        receivable  subsequently  collected in the  ordinary  course of business
        consistent with past practice and (iii) immaterial amounts of inventory,

                                       21

<PAGE>

        machinery  and  equipment  that have been  determined  to be obsolete or
        otherwise not necessary and have been disposed of in the ordinary course
        of business consistent with past practice),  in each case free and clear
        of all  Encumbrances  except for any  Encumbrance  reflected in Schedule
        2.14 hereof. All buildings, structures, improvements and fixtures owned,
        leased  or used by VSI or  Seller  in the  conduct  of their  respective
        businesses conform in all material respects to all applicable codes, and
        rules adopted by any applicable  Governmental Body or national and local
        associations  and  boards  of  insurance  underwriters;   and  all  such
        buildings,  structures,  improvements and fixtures are in good operating
        condition and repair, normal "wear and tear" excepted.

                2.15 Insurance.  Schedule 2.15 hereof sets forth a complete list
        of all policies of or binders for fire, liability, worker's compensation
        and other  forms of  insurance  owned or held by each of VSI and Seller.
        All such policies, or binders thereof, are in full force and effect, all
        premiums with respect  thereto  covering all periods up to and including
        the  respective  dates set forth in Schedule 2.15 hereof have been paid,
        and no notice of  cancellation  or  termination  has been  received with
        respect to any such policy or binder.  Such  policies or binders (i) are
        sufficient  for  compliance  with  all  requirements  of  law  currently
        applicable to each of VSI and Seller and of all agreements to which each
        of VSI and Seller is a party or by which any of them is bound;  (ii) are
        in such amounts and types of coverage as are  customarily  maintained by
        businesses  of the size and type as VSI's and  Seller's;  (iii)  provide
        insurance coverage adequate for the Assets and present operations of VSI
        and  Seller;  (iv) will  remain in full  force and  effect  through  the
        respective  dates set forth in Schedule 2.15 hereof  without the payment
        of additional  premiums;  and (v) will not in any way be affected by, or
        terminate or lapse by reason of, the  transactions  contemplated by this
        Agreement.  Schedule 2.15 hereof also identifies all risks which each of
        VSI and Seller has  designated  as being  self-insured.  Neither VSI nor
        Seller has been  refused  any  insurance  with  respect to its assets or
        operations,  nor has its coverage been limited, by any insurance carrier
        to which it has  applied  for any such  insurance  or with  which it has
        carried insurance during the last five years.

                2.16     Business Property Rights.

                         2.16.1 Schedule 2.16 hereof sets forth (i) all computer
                software,  patents,  and  registrations  for  trademarks,  trade
                names,  service marks and  copyrights  which are unexpired as of
                the  date  hereof  and  which  are used in  connection  with the
                operation of each of VSI's and Seller's business, as well as all
                applications  pending on said date for patents or for trademark,
                trade name,  service  mark or copyright  registrations,  and all
                other trade  secrets and  proprietary  rights,  owned or held by
                each of VSI and Seller and which are reasonably necessary to, or
                used in connection with, the business of each of VSI and Seller;
                and (ii) all licenses (other than shrink wrap licenses)  granted

                                       22

<PAGE>

                by or to VSI or Seller and all other  agreements to which VSI or
                Seller is a party and which relate,  in whole or in part, to any
                items of the  categories  mentioned in (i) above or to any trade
                secret or other  proprietary  rights of VSI or Seller  which are
                reasonably  necessary  to,  or  used  in  connection  with,  the
                business of VSI or Seller.

                         2.16.2  The  property  referred  to in  Section  2.16.1
                hereof,  together  with (i) all  designs,  methods,  inventions,
                know-how, related thereto and (ii) all trademarks,  trade names,
                service marks,  and copyrights  claimed or used by either VSI or
                Seller which have not been  registered  (collectively  "Business
                Property Rights"),  constitute all such proprietary rights owned
                or held  by  either  VSI or  Seller  and  which  are  reasonably
                necessary  to, or used in the conduct of the  business of either
                VSI or Seller.  All of those items  designated  as trade secrets
                and  all  related  designs,  methods,  inventions  and  know-how
                constitute  trade secrets of VSI or Seller within the meaning of
                all  applicable  laws,  and each of VSI and Seller has taken all
                necessary  steps  required by law to protect these trade secrets
                as  such.   With  respect  to  each  such  trade   secret,   the
                documentation   relating  to  such  trade   secret  is  current,
                accurate,  and  sufficient  in detail and content to identify it
                and to allow its full and proper use. No such trade  secrets are
                part of the public  knowledge or literature,  nor have they been
                used,  divulged,  or  appropriated  for the benefit of any Third
                Party or otherwise to the detriment of VSI or Seller.

                         2.16.3 Each of VSI and Seller, as the case may be, owns
                or has valid  rights to use all such  Business  Property  Rights
                without conflict with the rights of others.  Except as set forth
                in Schedule 2.21 hereof,  no Person or corporation  has made or,
                to the  knowledge of each of VSI and Seller,  Threatened to make
                any claims that the  operation  of the business of VSI or Seller
                is in violation of or infringes any other  proprietary  or trade
                rights of any Third Party.  To the  knowledge of each of VSI and
                Seller,  no Third Party is in violation of or is infringing upon
                any Business Property Rights.

                2.17 Collective Bargaining  Agreements.  There are no collective
        bargaining  agreements  which relate to either VSI or Seller or to which
        either VSI or Seller is a party or which cover one or more Employees.

                                       23
<PAGE>

        2.18    Employees.

                         2.18.1  Schedule  2.18.  to this  Agreement  contains a
                complete and accurate list of the following information for each
                Employee,  including each Employee on leave of absence or layoff
                status:  (i) name; (ii) address;  (iii) telephone  number;  (iv)
                social security number; (v) date of birth; (vi) job title; (vii)
                date of hire;  (viii)  hourly  or  weekly  compensation  rate in
                effect on June 30, 1998,  and a comparison  of such rate to that
                in effect  on June 30,  1997;  (ix)  vacation  accrued;  and (x)
                service  credited  for  purposes of vesting and  eligibility  to
                participate  under  any  pension,  retirement,   profit-sharing,
                thrift-savings,   deferred  compensation,   stock  bonus,  stock
                option,   cash  bonus,   employee  stock  ownership   (including
                investment  credit or payroll stock  ownership),  severance pay,
                insurance,  medical,  welfare,  or vacation  plan,  or any other
                employee benefit plan. To the best of each of VSI's and Seller's
                knowledge,  during  the past four years  neither  VSI nor Seller
                has,  directly or indirectly,  purchased,  leased,  acquired any
                property  or  obtained  any  services  from,  or  sold,  leased,
                disposed  of any  property  or  furnished  any  services  to, or
                otherwise  dealt  with  any  Employee  or any  Person,  firm  or
                corporation  which,  directly or  indirectly,  alone or together
                with  others,  controls,  is  controlled  by or is under  common
                control with any Employee,  except with respect to  remuneration
                for services rendered as a director,  officer or employee of VSI
                or Seller.

                         2.18.2  To the  best  of  each of  VSI's  and  Seller's
                knowledge,  no part of the property or assets of any Employee or
                any Person,  individual or  organization  directly or indirectly
                related to any Employee is used by VSI or Seller.

                         2.18.3  Neither  VSI nor  Seller  has  encountered  any
                actual or threatened Employee strike, work stoppage, slowdown or
                lockout,  or had  any  material  change  in its  relations  with
                Employees,  agents,  customers or suppliers  for the three years
                prior  to the date of this  Agreement.  No  question  concerning
                representation  has been raised or is threatened with respect to
                the Employees.

                         2.18.4 No  "leased  employee",  as that term is defined
                within  the  meaning  of  Section  414(n) of the Code,  performs
                services for VSI or Seller other than temporary employees.

                         2.18.5  Except as  disclosed  in Schedule  2.18 to this
                Agreement, the consummation of the transactions  contemplated by
                this  Agreement  will not (i)  entitle  any  current  or  former
                Employee  or current or former  officer  or  director  of VSI or
                Seller to severance pay, unemployment  compensation or any other
                payment,  except as expressly  provided in this Agreement;  (ii)

                                       24

<PAGE>

                accelerate  the time or  payment or  vesting,  or  increase  the
                amount  of  compensation  due  any  such  Employee,  officer  or
                director;   or  (iii)  result  in  any  prohibited   transaction
                described  in Section  406 of ERISA or Section  4975 of the Code
                for which an exemption is not available.

                         2.18.6  Each of VSI and  Seller  is  currently  and has
                always been in  compliance  in all  material  respects  with all
                applicable laws respecting  employment and employment practices,
                terms and  conditions of wages and hours,  and is not engaged in
                any unfair labor practice.

                         2.18.7  Neither VSI nor Seller (i) has taken any action
                which,  alone or in conjunction with actions committed by VSI or
                Seller  prior to the  Closing  Date to be  taken in the  future,
                would  constitute a "plant  closing" or "mass layoff" within the
                meaning of the Worker Adjustment and Retraining Notification Act
                ("WARN")  or  applicable  state  law;  or (ii)  has  issued  any
                notification of a "plant  closing" or "mass layoff"  required by
                WARN or by applicable state law.

                2.19  Other  Contracts.  Schedule  2.19  hereof  sets  forth all
        contracts,    understandings   and   commitments   (including,   without
        limitation,  mortgages,  indentures and loan agreements) to which either
        VSI or  Seller  is a party,  or to which  either of them or any of their
        respective  assets  or  properties  are  subject,   and  which  are  not
        specifically  referred to in the other Schedules hereof other than those
        which are  exempted  by the terms of Section  1.3(ii)  hereof from being
        listed on Schedule 1.3B.  True and complete  copies of all documents and
        complete descriptions of all oral understandings, if any, referred to in
        the  Schedules  will be  provided  or made  available  to Buyer  and its
        counsel on or prior to the Delivery Date.

                2.20 No Breach or Default. Neither VSI nor Seller is in material
        default  under  any  contract  to  which it is a party or by which it is
        bound,  nor has any event occurred which,  after the giving of notice or
        the passage of time or both,  would  constitute a material default under
        any such contract. Neither VSI nor Seller has any reason to believe that
        the parties to such contracts will not fulfill their  obligations  under
        such  contracts  in  all  material   respects  or  are  threatened  with
        insolvency.

                2.21     Litigation.

                         2.21.1  Schedule  2.21  hereof  sets forth a list and a
                summary description of all pending or Threatened  Proceedings in
                respect of each of VSI and Seller,  setting forth,  with respect
                to each action or suit,  (i) the reserves  reflected in the most
                recent Financial Statements and (ii) the existence and extent of
                insurance coverage.

                                       25

<PAGE>

                         2.21.2  Except as set forth in  Schedule  2.21  hereof,
                there are no claims or Proceedings  pending or Threatened before
                any  Governmental  Body or before any  arbitrator of any nature,
                brought by or against  VSI or Seller or any of their  respective
                officers, directors,  Employees, agents or affiliates involving,
                affecting or relating to any assets, properties or operations of
                VSI  or  Seller  or  the   transactions   contemplated  by  this
                Agreement,  nor does there exist any fact which might reasonably
                be expected to give rise to any such suit,  Proceeding,  dispute
                or investigation.

                         2.21.3   Neither  VSI  nor  Seller  nor  any  of  their
                respective  assets or  properties is subject to any Order of any
                Governmental  Body or  arbitrator,  which  adversely  affects or
                might reasonably be expected to affect their respective  assets,
                properties,   business  operation,   prospects,  net  income  or
                financial  condition  or  which  would or  might  reasonably  be
                expected to interfere with the transactions contemplated hereby.

                         2.21.4  Other than as  provided  in  Section  1.4(iii),
                Buyer is not assuming any  liabilities  or obligations of VSI or
                Seller set forth on Schedule 2.21.  Schedule 2.21 is provided to
                Buyer solely for informational  purposes.  Buyer does,  however,
                agree to cooperate,  at Seller=s  expense,  with the  reasonable
                requests of Seller to make available certain witnesses and other
                evidence  during  the  pendency  of the  matters  set  forth  in
                Schedule 2.21.

                2.22 Accounts Receivable.  All trade accounts receivable of each
        of VSI and Seller  reflected in the Financial  Statements  and all trade
        accounts  receivable of each of VSI and Seller arising  between June 30,
        1998 and the Closing Date have arisen in the ordinary course of business
        and  represent  bona  fide,  undisputed   indebtedness  (subject  to  no
        counterclaim,  right of setoff or  warranty  claim other than as will be
        reserved   against  in  the  Closing  Balance  Sheet)  incurred  by  the
        applicable   account   debtor  for  goods  held   subject  to   delivery
        instructions  or shipped or delivered  pursuant to a contract of sale or
        for services performed by VSI or Seller.
                2.23  Inventories and Supplies.  The inventories and supplies of
        each  of VSI  and  Seller  reflected  in the  Financial  Statements,  or
        acquired by VSI or Seller  between June 30,  1998,  and the date hereof,
        are carried at not in excess of the lower of cost or fair market  value,
        and do not include any inventory  which is not usable or saleable in the
        ordinary  course of business of VSI and Seller as heretofore  conducted,
        in each  case  net of  reserves  provided  therefor  in  such  Financial
        Statements in accordance with GAAP.

                2.24 Environmental Matters. Except as set forth in Schedule 2.24
        hereof,
                         
                         2.24.1 Each of VSI and Seller is in compliance with and
                neither is liable under any  Environmental  Law. Neither VSI nor
                Seller  has  received  any  Order  or  written  notice  from any
                Governmental  Body or other Person  alleging any violation of or
                failure to comply with any  Environmental  Law, or any actual or

                                       26

<PAGE>

                Threatened  obligation  to  undertake  or bear  the  cost of any
                Environmental Liabilities with respect to any of the Facilities,
                or with respect to any property at, to, or from which  Hazardous
                Materials were generated,  manufactured,  refined,  transferred,
                imported,   used,  processed,   transported,   treated,  stored,
                handled, disposed, recycled, or received by VSI or Seller or any
                of their respective Employees.

                         2.24.2   There  are  no  Claims   resulting   from  any
                Environmental  Liabilities  that have been asserted with respect
                to or  affecting  any  of  the  Facilities  or  that  relate  to
                ownership or operation by VSI or Seller.

                         2.24.3 There are no Hazardous  Materials  present on or
                in the  Environment at the  Facilities,  including any Hazardous
                Materials  contained in barrels,  above or  underground  storage
                tanks,  landfills,  land  deposits,  dumps,  equipment  (whether
                moveable  or fixed) or other  containers,  either  temporary  or
                permanent,  and deposited or located in land,  water,  sumps, or
                any  other  part of the  Facilities,  or  incorporated  into any
                structure   therein  or  thereon   except  in  compliance   with
                Environmental  Laws and with regard to which no remedial  action
                would be required if brought to the attention of a  Governmental
                Body with jurisdiction.

                         2.24.4  Either  VSI or  Seller  has  delivered  or made
                available to Buyer true and  complete  copies and results of any
                reports,  studies,  analyses,  tests, or monitoring possessed by
                VSI or Seller  pertaining  to  Hazardous  Materials  in,  on, or
                under, or to Environmental issues relating to, the Facilities or
                Former Facilities.

                2.25 Customers and Suppliers.   Except as  set forth in Schedule
        2.25 hereof,
        
                         (i) neither VSI nor Seller has  received  notice  that,
                nor does VSI or Seller have any knowledge  that, any customer of
                VSI or Seller has, will or plans to  discontinue  doing business
                with VSI or Seller;

                         (ii)  neither  VSI  nor  Seller  has  any   outstanding
                purchase contracts or commitments or unaccepted  purchase orders
                which  are  in  excess  of  the  normal,   ordinary   and  usual
                requirements;

                         (iii) no supplier or subcontractor to VSI or Seller has
                reduced  its  shipments  of orders  issued by VSI or Seller,  or
                threatened to  discontinue,  supplying such items or services to
                VSI or Seller on reasonable terms; and

                         (iv) neither VSI nor Seller has  received  notice that,
                nor  does  VSI nor  Seller  have any  knowledge  that,  any such
                supplier  or  subcontractor  has,  will or plans to  discontinue

                                       27

<PAGE>

                doing  business  with VSI or  Seller on  substantially  the same
                terms as are consistent with its past practices.

                2.26 No Brokers.  Neither  VSI nor Seller has  entered  into any
        contract, arrangement or understanding with any Person or firm which may
        result in the  obligation  of Buyer,  VSI or Seller to pay any  finder's
        fees,  brokerage  or  agent's  commissions  or other  like  payments  in
        connection  with  the  negotiations  leading  to this  Agreement  or the
        consummation of the transactions  contemplated  hereby,  and neither VSI
        nor  Seller is aware of any claim or basis for any claim for  payment of
        any  finder's  fees,  brokerage  or  agent's  commissions  or other like
        payments in connection with the  negotiations  leading to this Agreement
        or the consummation of the transactions contemplated hereby.

                2.27  Indemnities  and  Guaranties.  Neither  VSI nor Seller has
        indemnified or provided a guaranty to any Person except (i) as set forth
        and described in Schedule 1.3B hereof and (ii) to customers of either in
        the ordinary course of business.

                2.28 No  Misrepresentation  or Omission.  No  representation  or
        warranty by VSI or Seller in this  Section 2 or in any other  Section of
        this Agreement,  or in any certificate or other document furnished or to
        be furnished by VSI or Seller pursuant hereto,  contains or will contain
        any untrue statement of a material fact or omits or will omit to state a
        material fact  necessary to make the  statements  contained  therein not
        misleading or will omit to state a material  fact  necessary in order to
        provide Buyer with accurate information as to VSI and Seller.

                2.29   Survival   of   Representations   and   Warranties.   All
        representations and warranties by each of VSI and Seller in this Section
        2 or in any  other  Section  hereof,  or in  any  certificate  or  other
        document  furnished or to be furnished by VSI or Seller pursuant hereto,
        shall survive  delivery by Buyer of the  consideration to be given by it
        hereunder and delivery by each of VSI and Seller of the consideration to
        be given by each hereunder,  and shall survive the execution hereof, the
        Closing hereunder and the Closing Date; provided, however, that no claim
        based on any breach of any such warranty or any misrepresentation may be
        made by any Buyer Indemnitee  unless written notice with respect thereto
        is given on or before the third anniversary of the Closing Date.

        3.  Representations and Warranties of Buyer. Buyer hereby represents and
warrants to Seller and VSI as follows  (Buyer  reserving  the right to attach at
the Delivery Date and update at and as of the Closing Date Schedules in addition
to those  called  for  herein and to add  references  thereto  in the  following
warranties and representations as appropriate):

                3.1 Existence;  Good Standing;  Corporate Authority;  Compliance
        With Law. Buyer (i) is a corporation duly incorporated, validly existing

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<PAGE>

        in good standing under the laws of its  jurisdiction  of  incorporation;
        (ii)  is  duly  licensed  or  qualified  to  do  business  as a  foreign
        corporation  and is in  good  standing  under  the  laws  of  all  other
        jurisdictions  in which the character of the properties  owned or leased
        by it therein or in which the  transaction  of its  business  makes such
        qualification  necessary  except  where the  failure to be so  qualified
        would not be  material;  (iii)  has all  requisite  corporate  power and
        authority  to own  its  properties  and  carry  on its  business  as now
        conducted;  (iv) is not in material default with respect to any Order of
        any Governmental  Body or arbitration board to which Buyer is a party or
        is subject;  (v) is not in material  violation of any laws,  ordinances,
        governmental  rules or regulations to which it is subject;  and (vi) has
        obtained all material licenses, permits and other authorizations and has
        taken  all  actions   required  by  applicable   laws  or   governmental
        regulations in connection with its business as now conducted.

                3.2      Authorization, Validity and Effect of Agreements.  

                         3.2.1 The execution and delivery of this  Agreement and
                all agreements and documents  contemplated  hereby by Buyer, and
                the consummation by it of the transactions  contemplated hereby,
                have been duly authorized by all requisite corporate action.

                         3.2.2 This  Agreement  constitutes,  and all agreements
                and  documents  contemplated  hereby when executed and delivered
                pursuant  hereto for value received will  constitute,  the valid
                and  legally  binding   obligations  of  Buyer   enforceable  in
                accordance with their terms,  except that  enforceability may be
                limited by applicable  bankruptcy,  insolvency,  reorganization,
                fraudulent  transfer,   moratorium,   bulk  sales,   preference,
                equitable  subordination,  marshalling  or other similar laws of
                general  application  now or hereafter in effect relating to the
                enforcement of creditors'  rights  generally and except that the
                remedies of specific performance,  injunction and other forms of
                equitable   relief  are  subject  to  certain  tests  of  equity
                jurisdiction, equitable defenses and the discretion of the court
                before which any proceeding therefor may be brought.

                         3.2.3 The execution  and delivery of this  Agreement by
                Buyer  does  not,  and  the  consummation  of  the  transactions
                contemplated  hereby  will  not,  (i)  except  as set  forth  on
                Schedule   3.2  hereof,   require  the   consent,   approval  or
                authorization of, or declaration,  filing or registration  with,
                any  Governmental  Body or any Third  Party,  (ii) result in the
                breach  of any term or  provision  of, or  constitute  a default
                under, or result in the  acceleration of or entitle any party to
                accelerate  (whether  after the giving of notice or the lapse of
                time or both) any obligation under, or result in the creation or
                imposition of any  Encumbrance  upon any part of the property of
                Buyer  pursuant  to any  provision  of,  any  Order,  indenture,
                mortgage, lease, license, lien, or other agreement or instrument

                                       29

<PAGE>

                to which  Buyer is a party or by which it is  bound,  and  (iii)
                violate  or  conflict  with  any  provision  of  the  bylaws  or
                Certificate  of  Incorporation  of Buyer as  amended to the date
                hereof.

                3.3   Survival   of   Representations   and   Warranties.    All
        representations  and  warranties  by Buyer in this  Section  3 or in any
        other Section hereof, or in any certificate or other document  furnished
        or to be furnished by Buyer pursuant  hereto,  shall survive delivery by
        Buyer of the  consideration  to be given by it hereunder and delivery by
        each  of VSI  and  Seller  of the  consideration  to be  given  by  each
        hereunder, and shall survive the execution hereof, the Closing hereunder
        and the Closing Date; provided,  however,  that, other than as set forth
        in Section 4.2 hereof, no claim based on any breach of any such warranty
        or any  misrepresentation  may be made by VSI or Seller  unless  written
        notice with respect thereto is given on or before the third  anniversary
        of the Closing Date.

        4.      Indemnification.

                4.1 Indemnification by Seller and VSI. Subject to the provisions
        of Section  5.15 below and upon the terms and subject to the  conditions
        set forth in Sections 4.3 and 4.5 hereof and this  Section  4.1,  Seller
        and VSI,  jointly and severally,  agree to indemnify,  defend,  protect,
        save and hold harmless the Buyer  Indemnitees (or any Buyer  Indemnitee)
        against,  and  will  reimburse  the  Buyer  Indemnitees  (or  any  Buyer
        Indemnitee)  for,  any and all Losses  made or  incurred  by or asserted
        against the Buyer  Indemnitees  (or any Buyer  Indemnitee),  at any time
        after the Closing Date, directly or indirectly,  arising out of, related
        to,  caused by, or  resulting  from any of the  following  (in each case
        regardless of by whom asserted):

                         4.1.1 any and all  liabilities or obligations of Seller
                or VSI or claims against or imposed on the Buyer Indemnitees (or
                any  Buyer  Indemnitee),  of  any  nature,  including,   without
                limitation, those relating to the respective business activities
                of  Seller  or  VSI  or to  conditions  existing  on  any of the
                Facilities prior to the Closing Date (whether accrued, absolute,
                contingent  or  otherwise  and  whether  a   contractual,   tax,
                statutory or other type of  liability,  obligation or claim) not
                specifically   assumed  by  Buyer  pursuant  hereto  (including,
                without  limitation,  those liabilities or obligations of VSI or
                Seller specifically referred to in Section 1.4 hereof);

                         4.1.2  any  inaccuracy,  omission,   misrepresentation,
                breach of warranty or  representation,  or nonfulfillment of any
                term, provision,  covenant or agreement on the part of Seller or
                VSI contained herein, or any inaccuracy or misrepresentation in,
                or omission from, any certificate or other instrument  furnished
                or to be furnished by Seller or VSI to Buyer pursuant hereto;

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<PAGE>

                         4.1.3 Seller's or VSI's failure to comply with any bulk
                transfer  provisions  which  may be in  effect  in the  state or
                states in which the Assets are located;

                         4.1.4 (i) any  Breach by Seller or VSI of  Seller's  or
                VSI's   environmental   representation  and  warranty  contained
                herein;  (this indemnity is intended to allocate  responsibility
                between VSI, Seller and Buyer and any other Indemnified Party as
                contemplated by Section 107(e)(1) of CERCLA or similar law);

                         4.1.5  any  and  all  items  listed  on  the  Schedules
                delivered  subsequent  to the Closing,  objected to by Buyer and
                determined  in  accordance  with  Section  5.15 hereof not to be
                items assumed by Buyer pursuant hereto.

                As used herein,  the term "Losses"  shall mean,  with respect to
        any Person or party, any payment,  loss, liability,  obligation,  damage
        (including,  without  limitation,  consequential,  punitive,  special or
        otherwise),  deficiency,  lien, claim, suit, cause of action,  judgment,
        cost or expense (including,  without limitation,  reasonable  attorneys'
        fees and  court  costs  and  costs  of  cleanup,  containment,  or other
        remediation of the Environment) of any kind, nature or description.

                As used herein,  the term  "Buyer Indemnitees"  shall mean Buyer
        and any affiliate of Buyer;

                As used herein, the term "affiliate" shall mean, with respect to
        any Person or party, (i) any Person or party controlling,  controlled by
        or  under  common  control  with any  such  Person  or party or (ii) any
        director  or  executive  officer  of any such  Person or party or of any
        Person or party  referred  to in clause (i) of this  paragraph.  As used
        herein,  the term  "control"  shall  mean the  possession,  directly  or
        indirectly,  of the  power to  direct  or  cause  the  direction  of the
        management  and  policies  of a Person or  party,  whether  through  the
        ownership  of voting  securities  or voting  interests,  by  contract or
        otherwise.

                Notwithstanding  anything to the contrary  contained herein, the
        parties agree that any Buyer  Indemnitee's sole remedy for any claim for
        damages  (excluding  equitable  remedies and those resulting from fraud)
        arising  under this  Agreement  (including  the  Schedules) or any other
        agreement  between  Buyer and VSI or Seller  entered into in  connection
        herewith   (including   any  claim  based  upon   Seller's   warranties,
        representations  and covenants contained herein) shall be limited to the
        remedies  provided in the  indemnification  provisions of this Section 4
        and the Escrow Agreement.  Further,  Buyer waives all other statutory or
        common  law  rights to  recover  against  VSI or Seller  for any  matter
        relating to Environmental  Contamination,  Environmental  Liabilities or
        Hazardous  Materials.  There  shall  be no limit  on  Seller's  or VSI's
        obligation to indemnify and hold harmless any Buyer  Indemnitee  from or
        against Losses resulting from fraud.

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<PAGE>

                4.2  Indemnification by Buyer. Upon the terms and subject to the
        conditions  set forth in Section 4.3 hereof and this Section 4.2,  Buyer
        agrees to indemnify,  defend, protect, save and hold harmless Seller and
        VSI against,  and will  reimburse  Seller and VSI on demand for, any and
        all Losses made or incurred by or asserted  against Seller,  at any time
        after the Closing Date, directly or indirectly,  arising out of, related
        to,  caused  by,  or  resulting  from  (i)  any  inaccuracy,   omission,
        misrepresentation,  breach of warranty,  or  nonfulfillment of any term,
        provision,  covenant or agreement on the part of Buyer contained herein,
        (ii) any  inaccuracy  or  misrepresentation  in, or omission  from,  any
        certificate or other instrument furnished or to be furnished by Buyer to
        Seller  pursuant  hereto or (iii)  operation of business  activities  of
        Buyer  after the  Closing  Date  involving  the  Assets.  Within 45 days
        following the first anniversary of the Closing Date, Buyer shall deliver
        to VSI and  Seller  a  certificate  of Buyer  certifying  which of those
        liabilities and obligations of Buyer assumed from VSI or Seller pursuant
        to this  Agreement and listed on Schedule 1.3A or Schedule 1.3B (each as
        updated to Closing)  had become due and payable but had not been paid in
        full or resolved as of the first  anniversary of the Closing Date.  With
        respect to the liabilities and  obligations  listed in such  certificate
        (or which  were  erroneously  omitted  from such  certificate),  Buyer=s
        obligations  pursuant  to this  Section  4.2  shall  terminate  upon the
        payment or resolution of such liability or  obligation.  With respect to
        those  liabilities  and  obligations of Buyer assumed from VSI or Seller
        pursuant to this  Agreement and listed on Schedule 1.3A or Schedule 1.3B
        (each as updated to Closing) which by their  respective  terms in effect
        at Closing will become due and payable later than the first  anniversary
        of the Closing Date,  Buyer=s  obligations  pursuant to this Section 4.2
        shall  terminate  upon the payment or  resolution  of such  liability or
        obligation.  In the  event  the  certificate  is not  timely  delivered,
        Buyer=s obligation pursuant to this Section 4.2 shall terminate upon the
        payment or resolution  of all  liabilities  assumed  pursuant to Section
        1.3.  With respect to all other  liabilities  and  obligations  of Buyer
        assumed  from  VSI  or  Seller  pursuant  to  this  Agreement,   Buyer=s
        obligations  pursuant to this Section 4.2 shall terminate upon the third
        anniversary  of the  Closing  Date.  There  shall be no limit on Buyer=s
        obligation to indemnify and hold harmless Seller and VSI from or against
        Losses resulting from fraud.

                4.3 Conditions of Indemnification. With respect to any actual or
        potential claim, any written demand,  the commencement of any action, or
        the  occurrence of any other event which  involves any matter or related
        series  of  matters  (a  "Claim")   against  which  a  party  hereto  is
        indemnified   (the   "Indemnified   Party")  by  any  other  party  (the
        "Indemnifying Party") under Section 4.1 or 4.2 hereof:

                         4.3.1  Promptly  after  the  Indemnified   Party  first
                receives written  documents  pertaining to the Claim, or if such
                Claim  does not  involve a Third  Party  Claim (a  "Third  Party
                Claim"),  promptly after the Indemnified  Party first has actual

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<PAGE>

                knowledge of such Claim, the Indemnified Party shall give notice
                to the Indemnifying Party of such Claim in reasonable detail and
                stating the amount involved,  if known,  together with copies of
                any such written documents.

                         4.3.2  The  obligation  of the  Indemnifying  Party  to
                indemnify the Indemnified  Party with respect to any Claim shall
                not be affected by the failure of the Indemnified  Party to give
                the notice with respect thereto in accordance with Section 4.3.1
                hereof unless the Indemnifying Party shall establish that it has
                been materially prejudiced thereby.

                         4.3.3 If the Claim  involves a Third Party Claim,  then
                the  Indemnifying  Party  shall,  at its sole cost,  expense and
                ultimate  liability  regardless  of  the  outcome,  and  through
                counsel  of  its  choice  (which  counsel  shall  be  reasonably
                satisfactory to the Indemnified Party), litigate, defend, settle
                or  otherwise   attempt  to  resolve  such  Third  Party  Claim;
                provided, however, that if in the Indemnified Party's reasonable
                judgment a conflict  of interest  may exist with  respect to the
                Third Party Claim,  then the Indemnified Party shall be entitled
                to select counsel of its own choosing,  reasonably  satisfactory
                to the Indemnifying Party, in which event the Indemnifying Party
                shall be obligated to pay the fees and expenses of such counsel.
                Notwithstanding  the preceding  sentence,  the Indemnified Party
                may elect, at any time and at the Indemnified Party's sole cost,
                expense and ultimate  liability,  regardless  of the outcome (in
                the case of reasons other than the Indemnifying  Party's failure
                or refusal to provide a defense to such Third Party Claim),  and
                through counsel of its choice,  to litigate,  defend,  settle or
                otherwise  attempt to resolve  such Third  Party  Claim.  If the
                Indemnified   Party  so  elects  (for  reasons  other  than  the
                Indemnifying  Party's failure or refusal to provide a defense to
                such Third Party Claim),  then the Indemnifying Party shall have
                no obligation to indemnify the Indemnified Party with respect to
                such Third Party  Claim,  but such  disposition  will be without
                prejudice to any other right the  Indemnified  Party may have to
                indemnification  under Section 4.1 or 4.2 hereof,  regardless of
                the outcome of such Third Party Claim. If the Indemnifying Party
                fails or refuses to provide a defense to any Third Party  Claim,
                then the Indemnified Party shall have the right to undertake the
                defense,  compromise  or  settlement  of such Third Party Claim,
                through counsel of its choice,  on behalf of and for the account
                and at the risk of the Indemnifying  Party, and the Indemnifying
                Party  shall  be  obligated  to  pay  the  costs,  expenses  and
                attorney's fees incurred by the Indemnified  Party in connection
                with such Third Party Claim. In any event,  Seller and the Buyer
                Indemnitees  shall  fully  cooperate  with each  other and their
                respective  counsel  in  connection  with any  such  litigation,
                defense, settlement or other attempted resolution.

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<PAGE>

                4.4      Monetary Limits of Indemnification.

                         4.4.1  Notwithstanding  the  provisions  of Section 4.1
                hereof,  Seller and VSI will not be  obligated  to  indemnify or
                hold  harmless  any  Buyer  Indemnitee  from or  against  Losses
                arising out of or resulting  from  matters  described in Section
                4.1, (other than Losses  directly or indirectly  arising out of,
                related  to,  caused  by,  or  resulting  from  any  inaccuracy,
                omission  or  misrepresentation   contained  in,  or  breach  of
                warranty or representation respecting,  Section 2.22), until the
                amount of such Losses  individually  or in the aggregate  exceed
                the amount of $200,000 (the "Floor Amount"), it being understood
                and agreed  that the Floor  Amount  shall be deemed to have been
                reached as to each of VSI and Seller when Buyer=s  Losses exceed
                the amount of $200,000.  Upon reaching the Floor Amount,  Seller
                and VSI shall be  required to  indemnify  the  applicable  Buyer
                Indemnitee for Losses comprising the Floor Amount as well as all
                Losses  occurring  thereafter only from the Escrow Fund and only
                up to (except in the cases of Losses  resulting  from  fraud) an
                aggregate  amount  equal to the amount of the  Escrow  Fund then
                outstanding (the "Seller's Ceiling Amount"). Seller and VSI will
                be obligated to indemnify and hold harmless any Buyer Indemnitee
                from or against  Losses  directly or indirectly  arising out of,
                related  to,  caused  by,  or  resulting  from  any  inaccuracy,
                omission  or  misrepresentation   contained  in,  or  breach  of
                warranty or  representation  respecting,  Section 2.22 up to the
                Seller=s  Ceiling  Amount  without  regard to the Floor  Amount.
                Seller and VSI will be obligated to indemnify  and hold harmless
                any  Buyer   Indemnitee  from  or  against  Losses  directly  or
                indirectly  arising out of,  related to, caused by, or resulting
                from any inaccuracy, omission or misrepresentation contained in,
                or breach of warranty  or  representation  respecting,  Sections
                2.12.2  or  2.20  without  regard  to the  materiality  of  such
                inaccuracy, omission,  misrepresentation,  or breach of warranty
                or representation. Notwithstanding the provisions of Section 4.1
                hereof and except in the cases of Losses  resulting  from fraud,
                Seller  and VSI  will  not be  obligated  to  indemnify  or hold
                harmless  any Buyer  Indemnitee  from or  against  Losses to the
                extent such Losses are in excess of the Seller=s Ceiling Amount.
                There shall be no monetary limit on Seller's or VSI's obligation
                to  indemnify  and hold  harmless any Buyer  Indemnitee  from or
                against Losses resulting from fraud.

                         4.4.2  Notwithstanding  the  provisions  of Section 4.2
                hereof,  Buyer  will  not be  obligated  to  indemnify  or  hold
                harmless  Seller or VSI from or against Losses arising out of or
                resulting  from matters  described  in Section 4.2,  (other than
                Losses directly or indirectly arising out of, related to, caused
                by, or resulting from any  nonfulfillment of any covenant on the
                part of Buyer contained in Section 1.3 hereof or any certificate
                related thereto),  until the amount of such Losses  individually
                or in the aggregate  exceed the Floor Amount.  Upon reaching the
                Floor  Amount,  Buyer shall be required to indemnify  Seller and

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<PAGE>

                VSI for Losses comprising the Floor Amount as well as all Losses
                occurring  thereafter  only up to (except in the cases of Losses
                resulting  from fraud) an aggregate  amount equal to $12,000,000
                (the  "Buyer's  Ceiling  Amount").  Buyer will be  obligated  to
                indemnify  and hold  harmless  Seller  and VSI  from or  against
                Losses directly or indirectly arising out of, related to, caused
                by, or resulting from any  nonfulfillment of any covenant on the
                part of Buyer  contained in Section 1.3 hereof up to the Buyer=s
                Ceiling   Amount   without   regard   to   the   Floor   Amount.
                Notwithstanding  the provisions of Section 4.2 hereof and except
                in the cases of Losses  resulting from fraud,  Buyer will not be
                obligated to indemnify  or hold  harmless  Seller or VSI from or
                against  Losses to the extent  such  Losses are in excess of the
                Buyer=s  Ceiling  Amount.  There shall be no  monetary  limit on
                Buyer's  obligation to indemnify and hold harmless Seller or VSI
                from or against Losses resulting from fraud.

                                       35
<PAGE>

                4.5      Environmental Remediation.

                         4.5.1.  The term  "Environmental  Contamination"  shall
                mean  the  presence  of  Hazardous   Materials  at  any  of  the
                Facilities.  Environmental  Contamination  is indemnifiable as a
                Loss under Section 4.1 hereof if it has resulted in the issuance
                of  a  final  Order  or  legally  enforceable   directive  by  a
                Governmental  Body or if it  triggers a Legal  Requirement  that
                imposes  an  obligation  to act,  or, for  Facilities  on leased
                property,  when  brought to the  attention  of the landlord as a
                result of a legal  requirement or a requirement  under the lease
                to so  notify,  results in a legally  enforceable  demand by the
                landlord for remediation.

                         4.5.2 The  addressing of  Environmental  Contamination,
                (whether   by   assessment,   negotiation,    compromise,   risk
                assessment,  cleanup  or  otherwise)  (hereafter  "Environmental
                Remediation")  identified  by the  Environmental  Due  Diligence
                Review shall be  performed by VSI and Seller,  to the extent the
                cost of the Environmental Remediation of such contamination does
                not exceed the funds  available in the Escrow Fund.  If and when
                funds from the Escrow fund are  exhausted,  VSI and Seller shall
                have no obligation to perform any  Environmental  Remediation or
                otherwise   address   any   Environmental   Contamination.   The
                remediation of Environmental  Contamination identified after the
                Closing  shall be the  responsibility  of Buyer unless Buyer can
                establish  that such  contamination  arose prior to the Closing.
                Buyer  acknowledges that VSI and Seller shall have no obligation
                to  perform   Environmental   Remediation  unless  Environmental
                Contamination  is discovered  (i) during the  Environmental  Due
                Diligence review set forth in Section 5.5.2; or (ii) by, or as a
                result of a third party claim or demand; or (iii) due to a Legal
                Requirement under any  Environmental  Law.  Notwithstanding  any
                other  provision  of this Section  4.5.2,  if, after the Closing
                Date,   Buyer  is  informed  of,  or   inadvertently   discovers
                Environmental  Contamination that does not require the giving of
                notice to either a Governmental Body or to the landlord pursuant
                to the applicable lease,  Buyer shall give notice of same to VSI
                and  Seller  and  VSI and  Seller  shall  perform  Environmental
                Remediation to the standards set forth in Section 4.5.4.

                         4.5.3  Seller and VSI have the right to  undertake  any
                Environmental Remediation for which they are responsible subject
                to reasonable  agreement of Buyer and VSI  regarding  access to,
                and   non-interference   with   activities   of  Buyer  on,  the
                Facilities.  Seller and VSI shall be entitled to receive monthly
                reimbursement  from  the  Escrow  Fund  for  the  costs  of that
                Environmental Remediation to the extent funds are available.

                         4.5.4 The extent to which  Environmental  Contamination
                must be  remediated,  if at all,  shall be to the highest levels
                allowed  by  law  that  do  not   require  the   imposition   of

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<PAGE>

                institutional  controls  unless those  controls would not impair
                the  value,  or  interfere  with  the  reasonable  use,  of  the
                property,  and,  if  the  Facility  is on  leased  property,  to
                whatever level the landlord ultimately agrees; provided however,
                institutional  controls  that impair value may be allowed if VSI
                or Seller pays Buyer for the diminution in value attributable to
                that impairment.

        5.      Other Covenants and Agreements.

                5.1  Guaranty of  Receivables.  At the  Closing,  Seller and VSI
        shall  execute  and deliver to Buyer a Guaranty in the form set forth as
        Exhibit  "B" hereto  (the  "Receivables  Guaranty"),  under the terms of
        which  Seller and VSI,  jointly  and  severally,  shall  unconditionally
        guarantee that all indebtedness  represented by the accounts  receivable
        of VSI and Seller as of the Closing  Date (less the reserve for doubtful
        accounts not to exceed an  aggregate  of  $125,000)  will be received by
        Buyer.  Within 160 days following the Closing Date,  Buyer shall prepare
        and  deliver  to VSI and Seller an  accounting  of  collections  on such
        receivables on or before 150 days following the Closing Date,  certified
        as true and  correct by the Chief  Financial  Officer  of Buyer.  In the
        event such net  indebtedness  is not  received by Buyer on or before 150
        days after the Closing  Date,  VSI and Seller  shall within ten business
        days following  receipt from Buyer of such  accounting  giving notice to
        such effect  cause the Escrow Agent to make payment from the Escrow Fund
        to Buyer of an amount in cash equal to the  difference  between such net
        indebtedness  and  the  amount  received  by  Buyer  for  such  accounts
        receivable,  whereupon  Buyer  shall  promptly  assign  or  cause  to be
        assigned  to VSI or Seller  all  rights,  claims,  actions  or causes of
        action which Buyer may have relating to such unpaid receivables.  In the
        event that the amount  received  by Buyer for such  accounts  receivable
        shall be in excess of such net  indebtedness,  the amount of such excess
        will be paid by Buyer to VSI  (from  Buyer's  own funds and not from the
        Escrow Fund)  within such ten  business day period.  During the 150 days
        following the Closing  Date,  Buyer shall use  reasonable  and customary
        efforts to collect  such  receivables  (but  shall not be  obligated  to
        initiate  litigation)  and any  amounts  received by Buyer in respect of
        such  accounts  receivable  shall be applied  first to the  oldest  such
        account  receivable of the respective  account debtor unless the account
        debtor  specifically  directs otherwise in writing without any direction
        from Buyer.

                5.2      Restrictive Covenants.

                         5.2.1  Customer  Restriction.  Each of  Seller  and VSI
                covenants  and agrees  that it shall  not,  for a period of five
                years  from and  after the  Closing  Date,  working  alone or in
                conjunction  with one or more  other  Persons or  entities,  for
                compensation  or not,  (i)  provide  or offer to  provide to any
                Customer  (as such term is  hereinafter  defined) any product or
                service  the same or  similar  to that  offered by VSI or Seller
                prior to the  Closing,  or (ii)  induce or attempt to induce any

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<PAGE>

                Customer to withdraw,  curtail or cancel its business with Buyer
                or in any  manner  modify  or fail to enter  into any  actual or
                potential business  relationship with Buyer. As used herein, the
                term  "Customer"  means any  Person  or  entity  for whom VSI or
                Seller  provided  services on or prior to the Closing Date or to
                whom VSI or Seller provided a product on or prior to the Closing
                Date.

                         5.2.2  Non-Raid.  Each  Seller  and VSI  covenants  and
                agrees  that it shall  not,  for a period of five years from and
                after the Closing Date, working alone or in conjunction with one
                or more other Persons or entities,  for compensation or not, (i)
                recruit or otherwise  solicit or induce any Person or entity who
                is, on the Closing Date or thereafter,  an employee or vendor of
                VSI or Seller to terminate their  employment  with, or otherwise
                cease their  relationship with, Buyer or any of its subsidiaries
                or affiliates,  or (ii) hire,  recruit or otherwise  solicit any
                Person  or  entity  who,  within  the  six  months   immediately
                preceding  the Closing  Date,  had been an employee or vendor of
                VSI or Seller.

                         5.2.3 Noncompetition.  Each of Seller and VSI covenants
                and agrees  that it shall  not,  for a period of five years from
                and after the Closing Date, working alone or in conjunction with
                one or more other Persons or entities,  for compensation or not,
                permit  VSI's or  Seller's  name to be used by or  engage  in or
                carry on,  directly  or  indirectly,  either  for itself or as a
                member of a partnership  or as a stockholder,  investor,  agent,
                associate  or   consultant   of  any  Person,   partnership   or
                corporation  (other than Buyer or a  subsidiary  or affiliate of
                Buyer), any business in competition with the business as carried
                on by VSI or Seller on the Closing Date, but only for as long as
                such like business is carried on by (i) Buyer or any  subsidiary
                or  affiliate  of  Buyer,  or  (ii)  any  Person,   corporation,
                partnership,  trust or other  organization  or  entity  deriving
                title  from Buyer to the assets  and  goodwill  of the  business
                being  carried on by VSI or Seller on the Closing  Date,  in any
                county in any state of the United  States in which  Buyer or any
                subsidiary or affiliate of Buyer  conducts  business,  or in any
                other  county  in any  state  of the  United  States,  or in any
                country  or  political  subdivision  of the world.  The  parties
                intend that the covenants  contained in this Section 5.2.3 shall
                be  deemed to be a series of  separate  covenants,  one for each
                county in each state of the United  States and for each  country
                and  political   subdivision  of  the  world  and,   except  for
                geographic  coverage,  each  such  separate  covenant  shall  be
                identical  in terms to the  covenant  contained  in this Section
                5.2.3.

                         5.2.4 Tolling.  The term of the covenants  contained in
                Section  5.2.1,  5.2.2 or 5.2.3  hereof  shall be tolled for the
                period commencing on the date any successful action is filed for
                injunctive  relief or damages  arising out of a breach by VSI or
                Seller of Section  5.2.1,  5.2.2 or 5.2.3 hereof and ending upon
                final adjudication (including appeals) of such action.

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<PAGE>

                         5.2.5 Reformation.  If, in any judicial proceeding, the
                court  shall  refuse to enforce  all of the  separate  covenants
                contained in Section  5.2.1,  5.2.2 or 5.2.3 hereof  because the
                time limit is too long,  it is expressly  understood  and agreed
                between the parties hereto that for purposes of such  proceeding
                such time  limitation  shall be  deemed  reduced  to the  extent
                necessary to permit  enforcement of such  covenants.  If, in any
                judicial  proceeding,  the court shall  refuse to enforce all of
                the  separate  covenants  contained in Section  5.2.1,  5.2.2 or
                5.2.3  hereof  because  it  is  more  extensive  (whether  as to
                geographic  area, scope of business or otherwise) than necessary
                to protect the business  and goodwill of Buyer,  it is expressly
                understood  and  agreed  between  the  parties  hereto  that for
                purposes  of such  proceeding  the  geographic  area,  scope  of
                business or other aspect  shall be deemed  reduced to the extent
                necessary to permit enforcement of such covenants.

                         5.2.6  Injunctive  Relief.   Each  of  VSI  and  Seller
                acknowledges  that a breach  of  Section  5.2.1,  5.2.2 or 5.2.3
                hereof would cause irreparable damage to Buyer, and in the event
                of its actual or threatened  breach of the provisions of Section
                5.2.1,  5.2.2 or 5.2.3  hereof,  Buyer  shall be  entitled  to a
                temporary  restraining order and an injunction  restraining each
                of VSI and Seller  from  breaching  such  covenants  without the
                necessity  of posting  bond or proving  irreparable  harm,  such
                being conclusively admitted by VSI and Seller.  Nothing shall be
                construed as prohibiting Buyer from pursuing any other available
                remedies for such breach or  threatened  breach,  including  the
                recovery of damages from each of VSI and Seller. Each of VSI and
                Seller  acknowledges that the restrictions set forth in Sections
                5.2.1,  5.2.2  and  5.2.3  hereof  are  reasonable  in scope and
                duration, given the nature of the business of Buyer.

                         5.2.7  Use of  Name.  Each  of  Seller  and  VSI  shall
                discontinue all use of the name "Valley Systems" and any and all
                derivations thereof within 30 days after the Closing Date (other
                than in  respect of the name of VSI=s  401(k)  plan prior to its
                termination).

                         5.2.8 No  Dissolution.  Neither  VSI nor  Seller  shall
                dissolve until the entire Escrow Fund has been released pursuant
                to Section 5.3 hereof.

                5.3      Escrow.

                         5.3.1 The Escrow Fund shall be the exclusive  source of
                recovery   in   respect   of  each   of   VSI's   and   Seller's
                indemnification  obligations  pursuant  to  Section  4 hereof or
                otherwise arising under this Agreement  (including the Schedules

                                       39

<PAGE>

                hereto) or any other  agreement  between Buyer and VSI or Seller
                entered into in connection  herewith,  including any claim based
                upon each of VSI's and Seller's warranties,  representations and
                covenants  contained herein including those contained in Section
                5.1 hereof. The Escrow Fund shall be held and distributed,  with
                interest, by Bank One Texas, N.A. (the "Escrow Agent"), pursuant
                to an  Escrow  Agreement  in the form set forth as  Exhibit  "C"
                hereto (the  "Escrow  Agreement"),  which shall be executed  and
                delivered by VSI, Seller and Buyer at the Closing.

                         5.3.2  Buyer  shall be  entitled  to  receive  from the
                Escrow Fund a payment equal to the amount,  if any, provided for
                in Section 5.1 hereof without regard to the Floor Amount.

                         5.3.3  Subject  to  Sections  4.5.2 and  5.3.6  hereof,
                Seller and VSI shall be entitled to receive from the Escrow Fund
                the costs of  Environmental  Remediation  at all  Facilities not
                excluded  by Buyer from the  Assets  pursuant  to Section  5.5.2
                hereof and in accordance with the terms of the Escrow Agreement.

                         5.3.4 In the event  that any Buyer  Indemnitee  has any
                claim for  damages  based  upon VSI's and  Seller's  warranties,
                representations  and  covenants  contained  herein or  otherwise
                arising  hereunder or any other agreement  between Buyer and VSI
                or Seller entered into in connection  herewith (other than VSI's
                and Seller's obligations under Section 5.1 hereof),  Buyer shall
                give written  notice of same to VSI and Seller and shall forward
                a copy of such notice to the Escrow Agent.  If VSI or Seller has
                not   corrected  or  remedied   such  failure  of   performance,
                representation,  warranty or covenant  within 30 days  following
                receipt of such notice, then VSI and Seller acknowledge, subject
                to the  provisions  of Section 5.15 hereof,  that Buyer shall be
                entitled to receive from the Escrow Fund, in accordance with the
                terms of the Escrow  Agreement,  the  amount of  indemnification
                that Buyer is due pursuant to this Agreement.

                         5.3.5  Provided  no dispute or disputes in excess of an
                aggregate  of  $3,000,000  (or  $2,000,000,  if that part of the
                Escrow Fund subject to Section 5.3.6 hereof has been released to
                VSI or Seller), less the amount of any payments theretofore made
                in  satisfaction  of  Seller's  or  VSI's   indemnification  and
                guaranty obligations hereunder,  exist as to any Claim or Claims
                by any Buyer  Indemnitee  against all or a portion of the Escrow
                Fund  on  the  first  anniversary  of  the  Closing  Date,  then
                $1,000,000,  less the amount of any payments in  satisfaction of
                VSI's  or  Seller's  indemnification  and  guaranty  obligations
                hereunder,  will  be  released  to  Seller  or VSI on the  first
                business day  following  such first  anniversary  of the Closing
                Date.  To the extent such a dispute or disputes do exist as to a
                Claim or Claims on the first anniversary of the Closing Date, an

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<PAGE>

                amount  equal to the  amount  of such  Claim or  Claims  will be
                withheld  from such partial  release of the Escrow Fund and will
                continue to be held in  accordance  with the  provisions  of the
                Escrow  Agreement  until  such  Claim or Claims  have been fully
                resolved.  Provided  no  dispute  or  disputes  in  excess of an
                aggregate  of  $2,000,000  (or  $1,000,000,  if that part of the
                Escrow Fund subject to Section 5.3.6 hereof has been released to
                VSI or Seller), less the amount of any payments theretofore made
                in  satisfaction  of  Seller's  or  VSI's   indemnification  and
                guaranty obligations hereunder,  exist as to any Claim or Claims
                by any Buyer  Indemnitee  against all or a portion of the Escrow
                Fund on the second  anniversary  of the  Closing  Date,  then an
                additional   $1,000,000,   less  the  amount  of  any   payments
                theretofore   made  in   satisfaction   of  VSI's  or   Seller's
                indemnification  and  guaranty  obligations  hereunder,  will be
                released to Seller or VSI on the first  business  day  following
                such second  anniversary of the Closing Date. To the extent such
                a dispute  or  disputes  do exist as to a Claim or Claims on the
                second  anniversary  of the Closing Date, an amount equal to the
                amount  of such  Claim or  Claims  will be  withheld  from  such
                partial  release of the Escrow Fund and will continue to be held
                in accordance with the provisions of the Escrow  Agreement until
                such  Claim or Claims  have been  fully  resolved.  Provided  no
                dispute or disputes exist as to any Claim or Claims by any Buyer
                Indemnitee  against  all or a portion of the Escrow  Fund on the
                third anniversary of the Closing Date, then the remainder of the
                Escrow  Fund  will be  released  to  Seller  or VSI on the first
                business day  following  such third  anniversary  of the Closing
                Date and the Escrow Agreement shall thereupon terminate.  To the
                extent a dispute or disputes do exist as to a Claim or Claims on
                the third  anniversary  of the Closing  Date, an amount equal to
                the amount of such Claim or Claims  will be  withheld  from such
                release  of the  Escrow  Fund  and will  continue  to be held in
                accordance  with the  provisions of the Escrow  Agreement  until
                such Claim or Claims  have been  fully  resolved.  Seller's  and
                VSI's  obligations  hereunder  shall  not  be  affected  by  any
                termination of the Escrow Agreement.

                         5.3.6 On or before the first anniversary of the Closing
                Date,  VSI shall  certify in writing to Buyer that VSI or Seller
                or both have  completed  the  Environmental  Remediation  of the
                Environmental  Contamination identified by the Environmental Due
                Diligence  Review as required by the terms of Section 4.5 hereof
                as to all  Facilities  not excluded by Buyer pursuant to Section
                5.5.2  hereof  as  well  as  any   Environmental   Contamination
                identified  during the  Environmental  Remediation  (or,  in the
                event that such  Environmental  Remediation  is not completed at
                the first  anniversary  of the Closing Date, VSI shall deliver a
                certificate of the environmental engineering and consulting firm
                which is effecting such Environmental Remediation estimating the
                additional  time required for such completion and the additional
                cost thereof ("Estimated  Additional  Remediation Cost")).  Upon

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<PAGE>

                delivery to Buyer of VSI's  certificate  or the  certificate  of
                such firm,  as the case may be, an amount  equal to  $1,000,000,
                less  the sum of (i) the  aggregate  cost of such  Environmental
                Remediation  (including  the  Estimated  Additional  Remediation
                Cost) and (ii) the aggregate amount of other Losses of all other
                Buyer Indemnitees subject to indemnification pursuant to Section
                4.1 hereof in excess of $3,000,000,  shall forthwith be released
                to VSI and Seller out of the Escrow Fund. In the event that such
                Environmental   Remediation  was  not  completed  at  the  first
                anniversary  of the Closing  Date,  VSI shall deliver to Buyer a
                certificate   of   completion   thereof  upon  such   completion
                containing   a   statement   of  the   aggregate   cost  of  the
                Environmental   Remediation   effected   following   such  first
                anniversary,  and Buyer shall  immediately  release to Seller or
                VSI out of the Escrow Fund the amount,  if any, which would have
                been  released  to  Seller  or  VSI  under  this  Section  5.3.6
                following such first  anniversary  had such actual cost,  rather
                than the Estimated  Additional  Remediation  Cost,  been used in
                such calculation.

                5.4      Conduct of the Business.

                         5.4.1  Affirmative  Covenants.  On and  after  the date
                hereof and until the Closing Date or the date,  if any, on which
                this Agreement is earlier  terminated and abandoned  pursuant to
                Section 7 hereof (the  "Termination  Date"),  each of Seller and
                VSI shall:

                                  (i)   conduct its operations  according to its
                         ordinary and usual course of  business  consistent with
                         past practice; and

                                  (ii)  use  its  reasonable   best  efforts  to
                         preserve intact its business organization and goodwill,
                         to keep  available  the  services of its  officers  and
                         directors,  and to maintain satisfactory  relationships
                         with  suppliers,  distributors,  licensors,  licensees,
                         customers,   Employees  and  others   having   business
                         relationships with it.

                         5.4.2   Negative   Covenants.   Without   limiting  the
                generality of the foregoing,  and except for actions to be taken
                in connection with any of the transactions  contemplated hereby,
                without  Buyer's prior written  consent,  VSI shall not, and VSI
                shall cause Seller not to, on or after the date hereof and until
                the earlier of the Closing Date or the Termination Date:

                                  (i) other than dividends that would be paid to
                         the  holders  of the  Series C  Preferred  Stock in the
                         ordinary  course,  declare or pay any cash dividends on
                         its outstanding shares of capital stock;

                                  (ii) merge with,  consolidate  with,  sell its
                         assets to or  acquire  substantially  all the assets or
                         capital stock of, any other  corporation or Person,  or

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<PAGE>

                         enter into any other  transaction  not in the  ordinary
                         and usual course of its business;

                                  (iii)  incur  any  indebtedness  for  borrowed
                         money or guarantee  any such  indebtedness  or issue or
                         sell  any  debt   securities   or  guarantee  any  debt
                         securities   of  others,   except  that  it  may  incur
                         indebtedness   in  the  ordinary   course  of  business
                         consistent with prior practice;

                                  (iv) make any direct or  indirect  redemption,
                         purchase  or other  acquisition  of any of its  capital
                         stock;

                                  (v)  create  or amend  any  pension  or profit
                         sharing  plan,  bonus,  deferred  compensation,   death
                         benefit,  or retirement plan, or any other benefit plan
                         or program;

                                  (vi) amend its Certificate of Incorporation or
                         Bylaws, as amended to the date hereof, except as may be
                         necessary to carry out this Agreement or as required by
                         law;

                                  (vii) issue any shares of its  capital  stock,
                         effect  any  stock  split  or   otherwise   change  its
                         capitalization as it exists on the date hereof;

                                  (viii)  grant,  confer or award  any  options,
                         warrants,   conversion  rights  or  other  rights,  not
                         existing on the date  hereof,  to acquire any shares of
                         its capital stock;

                                  (ix)  enter  into  any  agreement  or make any
                         undertaking   which  could  be   violated,   or  create
                         obligations which could be accelerated,  as a result of
                         changes or  developments  or the  absence of changes or
                         developments  in,  the  business,   assets,   earnings,
                         operations or condition, financial or otherwise, of any
                         other  party  hereto  or  any of  its  subsidiaries  or
                         affiliates; or

                                  (x) make any material  changes in any of their
                         respective management employment arrangements.

                5.5      Due Diligence; Access to Information and Customers.

                                  5.5.1 General Due Diligence  Review.  From and
                         after the date hereof and  throughout  the period prior
                         to the earlier of the Closing  Date or the  Termination
                         Date, Buyer and its officers,  employees,  accountants,
                         counsel  and  other  authorized   representatives   may

                                       43

<PAGE>

                         perform  a due  diligence  review  of  VSI  and  Seller
                         relating to matters other than  Environmental  matters.
                         In  the  event  that  the   results   thereof  are  not
                         reasonably  satisfactory to Buyer,  Buyer may terminate
                         this Agreement as provided in Section 7.1.4 hereof.

                                  5.5.2 Environmental Due Diligence Review. From
                         and after the date hereof  through  the  Closing  Date,
                         Buyer and its officers, employees, accountants, counsel
                         and other authorized representatives will perform a due
                         diligence   review  of  VSI  and  Seller   relating  to
                         Environmental  matters  associated with the Facilities,
                         and  activities  of VSI and Seller  (collectively,  the
                         "Environmental  Due  Diligence  Review").  Buyer  shall
                         cause a qualified independent environmental engineering
                         and  consulting  firm  reasonably  acceptable to VSI to
                         perform  such a review.  Buyer shall not provide a copy
                         of any  report  resulting  from the  Environmental  Due
                         Diligence  to VSI,  unless  VSI  specifically  requests
                         otherwise.  If the  Environmental  Due Diligence Review
                         reveals  that  one or more  Facilities  has one or more
                         problems  relating to the Environment  (including,  but
                         not  limited   to,   Environmental   Liabilities)   the
                         remedying of which is or are reasonably advisable,  and
                         the aggregate  estimated  cost of such remedy as quoted
                         to Buyer is in excess of  $1,000,000,  then  Buyer will
                         have  the  right  to  exclude  any  one or more of such
                         Facilities  from  the  Assets  so  that  the  aggregate
                         estimated  cost of the  remedying  the  problems at the
                         remaining Facilities shall be as close to $1,000,000 as
                         practicable without exceeding $1,000,000.

                                  5.5.3   Reimbursement  for  Environmental  Due
                         Diligence Review.  If, as a result of the Environmental
                         Due Diligence  Review,  Environmental  Contamination is
                         discovered  that  is  indemnifiable  as  a  Loss  under
                         Section 4.1 hereof  pursuant to Section  4.5.1  hereof,
                         VSI shall  reimburse Buyer from the Escrow Fund for the
                         total costs of the  Environmental  Due Diligence Review
                         of each property where such indemnifiable Environmental
                         Contamination is present.

                                  5.5.4 Access. Each of VSI and Seller shall, as
                         soon as  possible  and in any  event no later  than the
                         Delivery Date, (i) afford to Buyer and to its officers,
                         employees,  accountants,  counsel and other  authorized
                         representatives   reasonable  access,   throughout  the
                         period  prior to the earlier of the Closing Date or the
                         Termination Date, to each of VSI's and Seller's plants,
                         properties,  equipment,  personnel,  books and  records
                         (including,  but not  limited  to,  audit  and tax work
                         papers and surveys, reports,  studies,  evaluations and
                         the  like   pertaining  to  the   Environment   at  the
                         Facilities  or Former  Facilities  (during  the time of
                         ownership  or  operation  by  VSI  or  Seller,   or  to

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                         activities of VSI or Seller);  (ii) use its  reasonable
                         best efforts to cause its representatives to furnish to
                         Buyer  and  to  its  authorized   representatives  such
                         additional  financial  and  operating  data  and  other
                         information  as  to  its   respective   businesses  and
                         properties   as   Buyer   or   its   duly    authorized
                         representatives   may  from  time  to  time  reasonably
                         request;  (iii) provide all  authorizations  reasonably
                         necessary   for   Buyer  to  review   records   of  any
                         Governmental  Body with  jurisdiction;  and (iv) afford
                         Buyer  and  its   representatives   reasonable  access,
                         throughout  the  period  prior  to the  earlier  of the
                         Closing Date or the  Termination  Date,  to its present
                         and potential  customers,  and Buyer and its authorized
                         representatives  shall have the right to  contact  such
                         customers and conduct such due diligence  investigation
                         relating   to   customer   relations   as  Buyer  deems
                         reasonably  necessary or  appropriate.  Buyer agrees to
                         perform all due diligence  under this Section 5.5 using
                         its reasonable  best efforts to minimize  disruption to
                         VSI's and Seller's  business.  Buyer further  agrees to
                         indemnify,  defend  and hold  Seller  harmless  for all
                         losses  resulting from physical damages caused by Buyer
                         or its agents in the course of Buyer's  due  diligence,
                         and to restore the Facilities to substantially the same
                         condition  they were in prior  thereto.  Buyer  further
                         agrees to dispose of any wastes or  materias  it or its
                         agents generated during the Environmental Due Diligence
                         Review,  and to do so in accordance with all applicable
                         Legal Requirements.

                                  5.5.5   Monthly   Financial   Statements   and
                         Reports.   VSI  and  Seller  shall   deliver  to  Buyer
                         unaudited    financial    statements    (including    a
                         consolidated balance sheet,  consolidated  statement of
                         operations,  consolidated  statement of cash flows, and
                         consolidated  statement  of  stockholders=  equity) and
                         other  operating  reports for each month beginning with
                         July 1998 and ending with the month preceding the month
                         during  which  the  Closing   occurs.   Such  financial
                         statements and operating  reports shall be delivered to
                         Buyer no later than twenty  business days after the end
                         of the month the  subject  thereof and shall be subject
                         to no warranty or representation of Seller or VSI.

                5.6  Acquisition  Proposals.   Neither  VSI  nor  Seller  shall,
        directly or indirectly, through any officer, director, agent, affiliate,
        representative  (including,  without  limitation,   investment  bankers,
        attorneys  and  accountants)  or  otherwise,  (i)  solicit,  initiate or
        encourage submission of inquiries,  proposals or offers from any Person,
        corporation,  partnership or other entity or group (as such term is used
        in  Section  13(d)(3)  of the  Exchange  Act) other than Buyer (a "Third
        Party"),  relating to any acquisition or purchase of all or a portion of
        the assets of, or any equity interest in, VSI or Seller;  or (ii) unless
        the  Board has  determined  that such  Third  Party has made a  Superior
        Takeover  Proposal,  participate  in  any  discussions  or  negotiations

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<PAGE>

        regarding,  or furnish to any Third Party any  information  with respect
        to, or otherwise cooperate in any way with, or assist or participate in,
        facilitate or encourage,  any effort or attempt by any Third Party to do
        or seek any of the foregoing. VSI and Seller shall promptly notify Buyer
        if any such proposal or offer,  or any inquiry or contact with any Third
        Party with respect  thereto,  is made,  and shall in any such notice set
        forth in reasonable detail the identity of the Third Party and the terms
        and conditions of such inquiry, proposal or offer. In the event that (a)
        the Closing shall fail to occur as the result of VSI or Seller violating
        the terms of this Section 5.6 or (b) VSI or Seller shall have determined
        that a Superior Takeover  Proposal exists,  shall have elected to accept
        such Superior Takeover Proposal and either the transaction  contemplated
        thereby is consummated or VSI or Seller  terminates  this Agreement as a
        result of such election,  VSI and Seller shall promptly, but in no event
        later than one day after the first of such events shall occur, pay Buyer
        an aggregate  fee of  $2,000,000,  which amount shall be payable in same
        day funds, plus all Expenses.  A "Superior  Takeover Proposal" means any
        bona fide (w) tender or exchange  offer;  (x)  proposal  for a merger to
        which  VSI or  Seller  would  be a  party;  (y)  consolidation  or other
        business  combination   involving  VSI  or  Seller;  or  (z)  any  other
        arrangement  to  acquire,  directly  or  indirectly,  for  consideration
        consisting  of cash,  securities or a  combination  thereof,  all of the
        common stock of VSI or Seller then  outstanding or all or  substantially
        all of the assets of VSI or Seller on terms that the Board determines in
        its good faith reasonable  judgment (after consultation with a financial
        advisor of nationally recognized reputation) to be more favorable to the
        stockholders  of  VSI  than  the   transactions   contemplated  by  this
        Agreement.

                5.7 Public Announcements. On or after the date hereof, and until
        the earlier of the Closing Date or the Termination Date, neither VSI nor
        Seller  shall  furnish any written  communication  (other than the Proxy
        Materials) to its  stockholders,  customers,  creditors or to the public
        generally  if the subject  matter  thereof  relates to the  transactions
        contemplated  hereby  without  the  prior  approval  of  Buyer as to the
        content  thereof;  provided,  however,  that the foregoing  shall not be
        deemed to prohibit any  disclosure  required by any applicable law or by
        any Governmental Body having jurisdiction over such matters.

                5.8 Notification of Certain  Matters.  VSI and Seller shall give
        prompt  notice to Buyer,  and Buyer shall give prompt  notice to VSI and
        Seller,  of (i) the occurrence,  or failure to occur, of any event which
        occurrence  or failure  would be likely to cause any  representation  or
        warranty of such party  contained  herein to be untrue or  inaccurate in
        any  material  respect at any time from the date  hereof to the  Closing
        Date; and (ii) any material  failure of VSI or Seller,  or of Buyer,  as
        the case may be, or of any officer, director, employee or agent thereof,
        to comply with or satisfy any  covenant,  condition  or  agreement to be
        complied with or satisfied by it hereunder.

                                       46
<PAGE>

                5.9 Best Efforts.  Each of VSI and Seller agrees to use its best
        efforts to take, or cause to be taken, all actions,  and to do, or cause
        to be done,  all things  reasonably  necessary,  proper or  advisable to
        consummate  and make  effective the  transactions  contemplated  hereby,
        including, without limitation,  obtaining all authorizations,  consents,
        waivers  and  approvals  as may  be  required  in  connection  with  the
        assignment  of those  contracts,  agreements,  licenses,  leases,  sales
        orders,  purchase  orders and other  commitments  to be assumed by Buyer
        pursuant hereto; provided that Seller shall not be obligated to make any
        payments in order to obtain any such authorizations,  consents,  waivers
        or approvals.

                5.10 Execution of Additional  Documents.  Each party hereto will
        at any time, and from time to time after the Closing Date,  upon request
        of the other party  hereto,  execute,  acknowledge  and deliver all such
        further deeds, assignments,  transfers,  conveyances, powers of attorney
        and assurances,  and take all such further action,  as may be reasonably
        required to carry out the intent of this Agreement,  and to transfer and
        vest title to any Asset being transferred hereunder,  and to protect the
        right,  title and  interest in and  enjoyment of all of the Assets sold,
        granted, assigned, transferred,  delivered and conveyed pursuant hereto;
        provided,  however, that this Agreement shall be effective regardless of
        whether any such additional documents are executed.

                5.11     Fees and Expenses.

                         5.11.1  Expense  Reimbursement.  If this  Agreement  is
                terminated by VSI or Seller for any reason whatsoever other than
                a failure of any  condition  set forth in Section 6.2 hereof and
                Buyer is not in material  breach of its material  covenants  and
                agreements  hereunder,  then VSI or Seller shall, whether or not
                any payment is made pursuant to Section 5.11.2 hereof, reimburse
                each of Buyer and its  stockholders  and  affiliates  (not later
                than one day after  submission of  statements  therefor) for all
                reasonable  out-of-pocket expenses and fees actually incurred by
                it  or  on  its  behalf  in  connection  with  the  negotiation,
                preparation, execution and performance of this Agreement and the
                transactions  contemplated  hereby,  or reasonably  and actually
                incurred by banks and other financial  institutions  and assumed
                by Buyer or its  stockholders  or affiliates in connection  with
                the negotiation,  preparation, execution and performance of this
                Agreement,  any  financing  related  hereto  and any  definitive
                financing  agreements  relating  thereto  (all of the  foregoing
                being referred to herein collectively as the "Expenses").

                         5.11.2  Other Costs and  Expenses.  Except as otherwise
                provided herein,  all costs and expenses  incurred in connection
                with this  Agreement and the  transactions  contemplated  hereby
                shall be paid by the party incurring such costs and expenses.

                                       47
<PAGE>

                5.12   Limitation  of  Liability.   Notwithstanding   any  other
        provision hereof, no shareholder,  officer,  director,  employee, agent,
        attorney,  affiliate,  servant,  successor,  assign or representative of
        either party hereto or of any affiliate thereof shall have any personal,
        partnership,  corporate or other  liability or obligation  whatsoever in
        respect  of or  relating  to the  covenants,  obligations,  indemnities,
        representations  or  warranties  of Buyer or VSI and Seller  under or by
        reason  hereof  or in  respect  of any  certificate  or  other  document
        delivered with respect hereto.

                5.13 HSR Act Filings.  Each of VSI and Seller and Buyer shall as
        soon  as  practicable  after  the  date  of this  Agreement  file  their
        respective   notification  and  report  forms  with  the  Federal  Trade
        Commission and the United States Department of Justice as required under
        the HSR  Act.  Each of VSI and  Seller  and  Buyer  agree  to use  their
        respective  good faith  efforts to eliminate  any concern on the part of
        any  Governmental  Body  regarding  the  legality  of  the  transactions
        contemplated under this Agreement.

                  5.14 Employees.  Buyer shall,  effective as of Closing,  offer
         employment  to all  Employees  of Seller  (subject to  satisfaction  of
         Buyer=s  standard  conditions  to  employment)  other than as otherwise
         reasonably  determined by Buyer (but in no event shall Buyer  terminate
         such number of former  employees of Seller  during such time periods as
         would  require  any  action  on the  part of  Seller  under  WARN).  In
         addition,  service credit for purposes of eligibility to participate in
         the  Buyer=s  401(k)  plan (and any other  qualified  retirement  plans
         maintained  by Buyer)  shall be granted to each  Employee  employed  by
         Buyer with respect to such Employee=s  period of employment with Seller
         and/or VSI. Upon  Closing,  Seller shall  terminate its Profit  Sharing
         401(k) Plan ("Plan"),  and as soon as may be administratively  feasible
         thereafter  shall submit to the  Internal  Revenue  Service  ("IRS") an
         application for a favorable  determination letter concerning the Plan's
         continued  qualification  upon  its  termination.  Pending  the  Plan's
         receipt of such  letter  from the IRS,  Buyer  shall  accept  Plan loan
         payments  from the  Employees  hired by Buyer,  for  remittance  to the
         Trustee of Seller=s Plan on at least a monthly  basis.  Upon the Plan's
         receipt of such letter from the IRS,  Buyer shall cause its 401(k) plan
         to accept direct transfer contributions on behalf of such Employees who
         choose to make direct  transfers to Buyer's  401(k) plan,  which direct
         transfer  contributions  may include,  at the election of the Employee,
         any  outstanding   loan  in  the  Employee's  Plan  account  for  which
         repayments are then current.  VSI and Seller shall fully cooperate with
         Buyer and lend all  assistance  reasonably  requested  by Buyer for the
         purpose of facilitating  Buyer's  employment of and communication  with
         Employees of Seller,  including, but not limited to, allowing access to
         the Facilities and any Employees and payroll and other Employee records
         requested by Buyer.

                5.15 Dispute Resolution. Other than as provided in Section 1.9.2
        hereof  and  notwithstanding  any  provision  of this  Agreement  to the
        contrary,  all  disputes,  controversies  or  claims  arising  out of or

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<PAGE>

        relating to this  Agreement  and the  transactions  contemplated  hereby
        shall be resolved by agreement among the parties, or, if not so resolved
        within forty five (45) days following written notice of dispute given by
        either  party  hereto to the other,  and if  written  notice is given by
        either of the parties as provided  below and the matter is not otherwise
        resolved by the parties  hereto,  by resort to arbitration in accordance
        with Title 9 of the United  States Code (the United  States  Arbitration
        Act) and the Commercial  Arbitration Rules, as amended from time to time
        (the "Rules") by the American Arbitration  Association and the following
        provisions; provided, however, that the provisions of this Section shall
        prevail in the event of any conflict with such Rules. Within thirty (30)
        days after the  giving of notice by a party to the other  parties of its
        desire to refer the matter in dispute to arbitration,  the parties agree
        that the matter shall be presented  to a panel of three  arbitrators  at
        least one of whom shall have at least ten years of  industry  experience
        relating  to the  subject  matter  of the  dispute.  Such  selection  of
        arbitrators  shall  be made in  accordance  with  the  Rules.  Any  such
        arbitration  proceeding  shall be held at a location to be determined by
        the arbitrators.  Any provisional  remedy that would be available from a
        court of law shall be available  from the  arbitrator  to the parties to
        this  Agreement   pending   arbitration.   The  written   decisions  and
        conclusions of a majority of the  arbitration  panel with respect to the
        matters referred to them pursuant hereto shall be final and binding upon
        the parties to the dispute, and confirmation and enforcement thereof may
        be rendered thereon by any court having jurisdiction upon application of
        any person who is a party to the arbitration  proceeding.  The costs and
        expenses  incurred in the course of such  arbitration  shall be borne by
        the party or parties  against whose favor the decisions and  conclusions
        of the arbitration panel are rendered;  provided,  however,  that if the
        arbitration  panel determines that its decisions are not rendered wholly
        against the favor of one party or parties or the other,  the arbitration
        panel shall be  authorized  to apportion  such costs and expenses in the
        manner that it deems fair and just in light of the merits of the dispute
        and its  resolution.  The  arbitration  panel  shall  have no  power  or
        authority  under this Agreement or otherwise to award or provide for the
        award of punitive or  consequential  damages  against any party.  In any
        arbitration  relating to whether Buyer has  Areasonably  concluded@ (for
        purposes of Section  6.1.16)  that there has been no material  breach of
        the   warranties   in  Section   2.24,   the   burden  of   establishing
        reasonableness shall be on Buyer.

        6.      Conditions of Closing.

                6.1 Buyer's  Conditions to Closing.  The  obligation of Buyer to
        purchase and pay for the Assets and to assume the specified  liabilities
        and  obligations  set forth herein  shall be subject to and  conditioned
        upon, at Buyer's option,  the satisfaction at the Closing of each of the
        following conditions:

                         6.1.1  The   holders   of  shares  of  the  issued  and
                outstanding  capital  stock of VSI and  Seller  shall  have duly
                adopted  and  approved  this  Agreement  and  all   transactions

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<PAGE>

                contemplated  hereby  in  accordance  with the  requirements  of
                Delaware  law and Ohio law,  respectively,  and the  Articles or
                Certificate of Incorporation  and Bylaws, as amended to the date
                of such adoption and approval, of each of VSI and Seller.

                         6.1.2 All representations and warranties of each of VSI
                and Seller  contained  herein  shall be true and  correct in all
                material  respects  at  and  as of the  Closing  Date  (provided
                however that in respect of the  warranties  and  representations
                contained in Section 2.24 hereof Section 6.1.16 shall apply) and
                each of VSI and Seller shall have  performed all  agreements and
                covenants in all material  respects and satisfied all conditions
                on its part to be  performed  or  satisfied  by the Closing Date
                pursuant to the terms  hereof,  and Buyer shall have  received a
                certificate  of each of VSI and Seller,  signed by its President
                and dated the Closing Date, to both such effects.

                         6.1.3  As of the  Closing,  there  shall  have  been no
                material  change  since  the date of the most  recent  Financial
                Statements  in VSI or Seller,  and neither VSI nor Seller  shall
                have  suffered  any  material  loss  (whether or not insured) by
                reason of physical damage caused by fire,  earthquake,  accident
                or other calamity which substantially affects the value of their
                respective assets,  properties or business, and Buyer shall have
                received a certificate of each of VSI and Seller,  signed by its
                principal  financial officer and dated the Closing Date, to such
                effect.

                         6.1.4 Seller and VSI shall have  executed and delivered
                 the Receivables Guaranty.

                         6.1.5 VSI shall have  delivered to Buyer a  Certificate
                of the Secretary of State (or other authorized  public official)
                of VSI's and Seller's  respective  jurisdiction of incorporation
                (and each other  jurisdiction  listed in  Schedule  2.5  hereof)
                certifying  as of a date  reasonably  close to the Closing  Date
                that each of VSI and Seller has filed all required reports, paid
                all required  fees and taxes,  and is, as of such date,  in good
                standing and  authorized  to transact  business as a domestic or
                foreign corporation, as the case may be.

                           6.1.6   Seller  and  VSI  shall  have   executed  and
                delivered the Escrow Agreement.

                           6.1.7  The  Escrow  Agent  shall  have   acknowledged
                  receipt of the Escrow Fund and  accepted  the same  subject to
                  the terms and conditions of the Escrow Agreement.

                           6.1.8 Buyer shall have  received from Arnall Golden &
                  Gregory,  LLP, counsel for VSI and Seller,  an opinion,  dated
                  the Closing Date, in the form attached hereto as Exhibit "D".

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<PAGE>

                           6.1.9 Each of VSI and Seller shall have  obtained all
                  authorizations,  consents,  waivers  and  approvals  as may be
                  required in connection with the assignment of those contracts,
                  agreements,  licenses,  leases, sales orders,  purchase orders
                  and other commitments to be assigned to Buyer pursuant hereto.

                           6.1.10   Seller  and  VSI  shall  have  executed  and
                  delivered  the  Bill  of  Sale,   Assignment   and  Assumption
                  Agreement.

                           6.1.11 Each of Seller and VSI shall have delivered to
                  Buyer a certificate,  dated the Closing Date, of each of VSI's
                  and Seller's corporate Secretary certifying:

                                    (i)   Resolutions   of  the   Board,   VSI's
                           stockholders,   Seller's   board  of  directors   and
                           Seller's sole stockholder approving and adopting this
                           Agreement and all  transactions  contemplated  hereby
                           and  authorizing  execution of this Agreement and the
                           execution,    performance   and   delivery   of   all
                           agreements,  documents and transactions  contemplated
                           hereby; and

                                    (ii)   The   incumbency   of  its   officers
                           executing  this  Agreement  and  all  agreements  and
                           documents contemplated hereby.

                           6.1.12 The approval  and all consents  from any Third
                  Party  or   Governmental   Body  required  to  consummate  the
                  transactions  contemplated hereby shall have been obtained and
                  the  waiting  period  and  any  statutory   extension  thereof
                  applicable   to   the   consummation   of   the   transactions
                  contemplated  by this  Agreement  under the HSR Act shall have
                  expired or been terminated.

                         6.1.13 No  Proceeding  shall  have been  instituted  or
                threatened  which  questions  the  validity  or  legality of the
                transactions  contemplated  hereby or any governmental  consent,
                approval or authorization  necessary for the consummation of the
                transactions of the transactions contemplated by this Agreement.

                         6.1.14 As of the  Closing,  there shall be no effective
                injunction,  writ, preliminary restraining order or any order of
                any nature issued by a court of competent jurisdiction directing
                that the transactions  provided for herein or any of them not be
                consummated  as so provided or imposing  any  conditions  on the
                consummation of the transactions  contemplated  hereby, which is
                unduly burdensome on Buyer.

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<PAGE>

                         6.1.15  Buyer  shall  have  received  from each of LOR,
                Inc., Rollins Investment Fund and Rollins Holding Company, Inc.,
                an executed  agreement whereby each of them, on their own behalf
                and on behalf of their respective affiliates, agrees to be bound
                by certain restrictive covenants  substantially similar to those
                imposed  on  Seller  and VSI  pursuant  to  Section  5.2 of this
                Agreement;  provided,  however,  that  no such  provision  shall
                prohibit an investment in any  publicly-traded  entity that does
                not require the filing of a Schedule  13D nor Schedule 13G under
                the Exchange Act.

                         6.1.16 Buyer shall have reasonably concluded, following
                the  Environmental  Due  Diligence  Review,  that  there  are no
                material  breaches in the warranties in Section 2.24;  provided,
                however, that such conclusion shall not preclude the remedies of
                Buyer  provided for herein.  For purposes of this Section 6.1.16
                only,  "material  breaches"  shall be defined as those  matters,
                which in the opinion of the environmental consultant retained as
                provided in Section 5.5.2, are reasonably  likely to cost in the
                aggregate in excess of $1,000,000 to remedy  (excluding the cost
                of addressing any environmental  issues on Facilities that Buyer
                elects to exclude from the purchase  pursuant to Section 5.5.2).
                If Buyer's consultant so concludes, then Buyer shall promptly so
                inform VSI of the  consultant's  opinion.  At such time, VSI may
                ask  Buyer  for the  information  and data  upon  which  Buyer's
                consultant bases his or her opinion.  If VSI does not agree that
                it is  reasonably  likely  to cost in excess  of  $1,000,000  to
                remedy  the  environmental  problems,  then VSI  shall  promptly
                inform Buyer of its belief.  If the parties  cannot resolve this
                issue within fifteen days after VSI so informs  Buyer,  then the
                matter shall be  submitted to  arbitration  in  accordance  with
                Section  5.15 and the  Closing  shall  be  delayed  pending  the
                resolution of such arbitration.  If the transaction closes, then
                VSI=s and  Seller's  obligation  to  perform  any  Environmental
                Remediation  shall be governed by the  provisions  and standards
                set forth in Section 4.5

                6.2 Seller's and VSI's Conditions to Closing.  The obligation of
        Seller and VSI to sell, grant, convey, assign,  transfer and deliver the
        Assets shall be subject to and  conditioned  upon, at VSI's option,  the
        satisfaction at the Closing of each of the following conditions:

                         6.2.1  The   holders   of  shares  of  the  issued  and
                outstanding  capital  stock of VSI shall have duly  adopted  and
                approved this Agreement and all transactions contemplated hereby
                in  accordance  with the  requirements  of Delaware  law and the
                Certificate of Incorporation  and Bylaws, as amended to the date
                of such adoption, of VSI.

                         6.2.2  All  representations  and  warranties  of  Buyer
                contained  herein  shall  be true and  correct  at and as of the

                                       52

<PAGE>

                Closing  Date in all  material  respects  and Buyer  shall  have
                performed all agreements and covenants in all material  respects
                and  satisfied  all  conditions  on its part to be  performed or
                satisfied by the Closing Date pursuant to the terms hereof,  and
                VSI and Seller  shall  have  received  a  certificate  of Buyer,
                signed  by its Chief  Executive  Officer  and dated the  Closing
                Date, to both such effects.

                         6.2.3 Buyer shall have effected payment of the Purchase
                Price  (less  the  Escrow  Fund) in  accordance  with the  prior
                written instructions of Seller.

                         6.2.4  Buyer  shall have  executed  and  delivered  the
                Escrow Agreement.

                         6.2.5 Buyer shall have  effected  payment of the Escrow
                Fund.

                         6.2.6 The Escrow Agent shall have acknowledged  receipt
                of the Escrow Fund and  accepted  the same  subject to the terms
                and conditions of the Escrow Agreement.

                         6.2.7 Buyer shall have  executed and delivered the Bill
                of Sale, Assignment and Assumption Agreement.

                         6.2.8  Buyer shall have  delivered  to Seller and VSI a
                certificate,  dated  the  Closing  Date,  of  Buyer's  corporate
                Secretary certifying:

                                  (i)  Resolutions  of its  board  of  directors
                         adopting  and   approving   this   Agreement   and  all
                         transactions   contemplated   hereby  and   authorizing
                         execution  of  this   Agreement   and  the   execution,
                         performance and delivery of all  agreements,  documents
                         and transactions contemplated hereby; and

                                  (ii) The incumbency of its officers  executing
                         this   Agreement  and  all   agreements  and  documents
                         contemplated hereby.

                         6.2.9 VSI and Seller  shall have  received  from Haynes
                and Boone, LLP, counsel for Buyer, an opinion, dated the Closing
                Date, in the form attached hereto as Exhibit "E".

                         6.2.10 The  approval  and all  consents  from any Third
                Party  or   Governmental   Body  required  to   consummate   the
                transactions  contemplated  hereby shall have been  obtained and
                the  waiting   period  and  any  statutory   extension   thereof
                applicable to the consummation of the transactions  contemplated
                by this  Agreement  under the HSR Act shall have expired or been
                terminated.

                                       53
<PAGE>

                         6.2.11 No  Proceeding  shall  have been  instituted  or
                threatened  which  questions  the  validity  or  legality of the
                transactions  contemplated  hereby or any governmental  consent,
                approval or authorization  necessary for the consummation of the
                transactions of the transactions contemplated by this Agreement

                         6.2.12 As of the  Closing,  there shall be no effective
                injunction,  writ, preliminary restraining order or any order of
                any nature issued by a court of competent jurisdiction directing
                that the transactions  provided for herein or any of them not be
                consummated  as so provided or imposing  any  conditions  on the
                consummation of the transactions  contemplated  hereby, which is
                unduly burdensome on VSI or Seller.

                         6.2.13  VSI,  Seller  and all  guarantors  of any  bank
                indebtedness  of VSI or Seller  shall  have  received  a written
                release  therefrom in form and  substance  satisfactory  to VSI,
                Seller and such guarantors.

        7.      Termination and Abandonment.

                7.1 Reasons for Termination. Anything herein or elsewhere to the
        contrary notwithstanding, this Agreement may be terminated and abandoned
        at any time after the date hereof but not later than the Closing:

                         7.1.1   by the mutual consent of VSI, Seller and Buyer;

                         7.1.2 by Buyer at any time after  January 8, 1999,  if,
                by that date,  the  conditions  set forth in Section  6.1 hereof
                shall not have been fulfilled or waived;

                         7.1.3 by VSI and  Seller at any time  after  January 8,
                1999,  if, by that date, the conditions set forth in Section 6.2
                hereof shall not have been fulfilled or waived;

                         7.1.4 by Buyer  at any time  prior to the  later of (i)
                the fifteenth  business day after the Delivery Date and (ii) the
                fifteenth  business day after such later date as Buyer  actually
                receives  the  Preliminary  Schedules  required  by Section  1.7
                hereof,  if the general due diligence  investigation  of VSI and
                Seller  by  Buyer  pursuant  to  Section  5.5.1  hereof,  or any
                Schedule  hereto or any  other  document  delivered  to Buyer as
                contemplated   hereby,   shall  have   revealed   any  facts  or
                circumstances  which,  in the  reasonable  judgment of Buyer and
                regardless  of the cause  thereof,  reflect in a material way on
                VSI or Seller;

                                       54
<PAGE>

                         7.1.5 by Buyer at any time if there has been a material
                change in VSI or Seller after the date hereof;

                         7.1.6  by  Buyer  or by VSI and  Seller  at any time if
                there  has  been a  material  breach  of any  representation  or
                warranty made by the other party herein or in any certificate or
                other document  delivered  pursuant  hereto or if there has been
                any  failure  by the  other  party to  perform  in all  material
                respects all  obligations or to comply with all covenants on its
                part to be performed hereunder; or

                         7.1.7 by Buyer or by Seller and VSI if there shall have
                been any statute,  rule or regulation  enacted or promulgated or
                deemed applicable to the transactions contemplated hereby by any
                Governmental  Body that, in the reasonable  judgment of Buyer or
                of VSI and  Seller,  as the case may be,  might (i)  result in a
                significant  delay in the ability of the  parties to  consummate
                the transactions  contemplated  hereby;  (ii) render the parties
                unable to consummate the transactions contemplated hereby; (iii)
                make such  consummation  illegal;  or (iv) otherwise  materially
                adversely affect VSI or Seller.

                         7.1.8 by Buyer if VSI and Seller  shall fail to deliver
                one or more of the  Preliminary  Schedules to this  Agreement in
                accordance  with  Section  1.7  hereof  or if one or more of the
                Preliminary Schedules, as delivered, differs materially from the
                information  concerning VSI and Seller provided by VSI or Seller
                to Buyer prior to the execution of this Agreement.

                7.2 Procedure  Upon and Effect of  Termination.  In the event of
        any termination and abandonment pursuant to Section 7.1 hereof,  written
        notice  thereof  shall  forthwith  be given to the  other  party and the
        transactions  contemplated  hereby  shall  thereupon be  terminated  and
        abandoned,  without further action by Buyer or by VSI and Seller (except
        for the  provisions of Sections  5.6,  5.11 and 5.12 hereof),  and there
        shall be no  liability  on the part of  either  VSI,  Seller or Buyer or
        their respective  officers,  directors or  stockholders,  except for the
        provisions  of  Sections  5.6,  5.11 and 5.12  hereof or except  for the
        material breach of any  representation,  warranty or covenant  contained
        herein that is within the reasonable control of the party in breach.

        8.      Miscellaneous.

                8.1 Notices. Any notice, consent,  approval,  request, demand or
        other  communication  required or permitted hereunder must be in writing
        to be  effective  and  shall be deemed  delivered  and  received  (i) if
        personally   delivered  or  delivered   by  telecopy   with   electronic
        confirmation,  when actually received by the party to whom sent, or (ii)
        if delivered by mail (whether actually received or not), at the close of

                                       55

<PAGE>

        business on the third business day next following the day when placed in
        the federal mail, postage prepaid,  certified or registered mail, return
        receipt requested, addressed as follows:

                If to Buyer:

                HydroChem Industrial Services, Inc.
                5956 Sherry Lane, Suite 930
                Dallas, Texas 75225
                Attention: Chief Executive Officer
                Facsimile No.: (214) 361-4715

                with a copy to:

                Haynes and Boone, LLP
                600 Congress Avenue, Suite 1600
                Austin, Texas 78701
                Attention: Dennis R. Cassell
                Facsimile No.: (512) 867-8470

                If to Seller or VSI:

                Valley Systems, Inc.
                11580 Lafayette Drive, NW
                Canal Fulton, Ohio 44614
                Attention: Chief Executive Officer
                Facsimile #:  (330) 854-3444

                         with a copy to:

                Arnall Golden & Gregory, LLP
                2800 One Atlantic Center
                1201 West Peachtree Street
                Atlanta, Georgia 30309
                Attention: Jonathan Golden
                Facsimile #: (404) 873-8701

(or to such other address as any party shall specify by written notice so given)

                8.2 Binding  Effect;  Benefits.  This Agreement shall be binding
        upon and shall  inure to the  benefit  of the  parties  hereto and their
        respective  successors and permitted assigns.  Notwithstanding  anything
        contained herein to the contrary,  nothing in this Agreement,  expressed
        or implied,  is intended to confer on any Person (other than the parties
        hereto,  the  Buyer  Indemnitees  (but only with  respect  to  Section 4
        hereof),  or their  respective  successors  and  permitted  assigns) any
        rights, remedies,  obligations or liabilities under or by reason of this
        Agreement.

                                       56
<PAGE>

                8.3  Entire  Agreement.   This  Agreement,   together  with  the
        Exhibits,  Schedules and other documents contemplated hereby, constitute
        the  final  written  expression  of all of the  agreements  between  the
        parties,  and is a complete  and  exclusive  statement  of those  terms.
        Except as  specifically  included or referred to herein,  this Agreement
        and the Exhibits,  Schedules  and other  documents  contemplated  hereby
        supersede all  understandings  and  negotiations  concerning the matters
        specified  herein.   Any   representations,   promises,   warranties  or
        statements  made by any party  that  differ in any way from the terms of
        this written Agreement, and the Exhibits,  Schedules and other documents
        contemplated  hereby,  shall be given no  force  or  effect  (except  as
        specifically  included or referred to herein).  The parties specifically
        represent,   each  to  the  other,  that  there  are  no  additional  or
        supplemental  agreements  between them related in any way to the matters
        herein contained unless specifically  included or referred to herein. No
        addition to or  modification  of any  provision  hereof shall be binding
        upon any party unless made in writing and signed by all parties.

                8.4 Governing Law. THIS AGREEMENT, AND ALL QUESTIONS RELATING TO
        ITS VALIDITY,  INTERPRETATION,  PERFORMANCE AND ENFORCEMENT  (INCLUDING,
        WITHOUT  LIMITATION,  PROVISIONS  CONCERNING  LIMITATIONS OF ACTION, BUT
        EXCLUDING THE PROVISIONS OF SECTION 5.2 HEREOF AND THE PROVISIONS HEREOF
        RELATING TO THE CORPORATE  GOVERNANCE  OF SELLER),  SHALL BE GOVERNED BY
        AND  CONSTRUED  IN  ACCORDANCE  WITH THE LAWS OF THE  STATE OF  DELAWARE
        (EXCLUSIVE  OF THE CONFLICT OF LAW  PROVISIONS  THEREOF)  APPLICABLE  TO
        AGREEMENTS  MADE AND TO BE  PERFORMED  ENTIRELY  WITHIN SUCH STATE.  THE
        PROVISIONS  OF SECTION 5.2 HEREOF SHALL BE GOVERNED BY AND  CONSTRUED IN
        ACCORDANCE  WITH  THE  LAWS OF THE  STATE  OF  TEXAS  (EXCLUSIVE  OF THE
        CONFLICT OF LAW PROVISIONS THEREOF) APPLICABLE TO AGREEMENTS MADE AND TO
        BE PERFORMED  ENTIRELY WITHIN SUCH STATE. THE PROVISIONS HEREOF RELATING
        TO THE CORPORATE GOVERNANCE OF SELLER SHALL BE GOVERNED BY AND CONSTRUED
        IN ACCORDANCE WITH THE LAWS OF THE STATE OF OHIO.

                8.5  Survival.   All  of  the  terms,   conditions,   covenants,
        agreements,   warranties  and  representations  contained  herein  shall
        survive,  in  accordance  with their terms,  the execution  hereof,  the
        Closing hereunder and the Closing Date.

                8.6  Counterparts.  This Agreement may be executed in any number
        of  counterparts,  each of which shall be deemed an original  but all of
        which shall constitute one and the same instrument;  but in making proof
        of this  Agreement,  it shall not be necessary to produce or account for

                                       57

<PAGE>

        more than one such  counterpart.  It is not  necessary  that each  party
        hereto execute the same counterpart,  so long as identical  counterparts
        are executed by all parties.

                8.7 Headings. Headings of the Sections of this Agreement are for
        the  convenience  of the parties only, and shall be given no substantive
        or interpretive effect whatsoever.

                8.8 Waivers. VSI and Seller may, by written notice to the Buyer,
        (i) extend the time for the  performance  of any of the  obligations  or
        other actions of Buyer  hereunder;  (ii) waive any  inaccuracies  in the
        representations  or  warranties  of  Buyer  contained  herein  or in any
        document delivered  pursuant hereto;  (iii) waive compliance with any of
        the  conditions or covenants of Buyer  contained  herein;  or (iv) waive
        performance of any of the obligations of Buyer hereunder.  Buyer may, by
        written  notice  to  VSI  and  Seller,  (i)  extend  the  time  for  the
        performance  of any of the  obligations  or other actions of each of VSI
        and Seller hereunder; (ii) waive any inaccuracies in the representations
        or  warranties  of each of VSI and  Seller  contained  herein  or in any
        document delivered  pursuant hereto;  (iii) waive compliance with any of
        the conditions or covenants of each of VSI and Seller contained  herein;
        or (iv) waive  performance of any of the  obligations of each of VSI and
        Seller hereunder.  Except as provided in the preceding two sentences, no
        action  taken  pursuant  hereto,   including   without   limitation  any
        investigation  by  or on  behalf  of  any  party,  shall  be  deemed  to
        constitute a waiver by the party taking such action of  compliance  with
        any  representations,  warranties,  covenants  or  agreements  contained
        herein.  The  waiver  by any party  hereto of a breach of any  provision
        hereunder  shall not operate or be construed as a waiver of any prior or
        subsequent breach of the same or any other provision hereunder.

                8.9  Incorporation  of Exhibits and Schedules.  All Exhibits and
        Schedules attached hereto are by this reference  incorporated herein and
        made a part hereof for all purposes as if fully set forth herein.

                8.10 Severability. If for any reason whatsoever, any one or more
        of the  provisions  hereof  shall  be  held  or  deemed  to be  illegal,
        inoperative,  unenforceable or invalid as applied to any particular case
        or in all  cases,  such  circumstances  shall  not  have the  effect  of
        rendering such provision illegal, inoperative,  unenforceable or invalid
        in any other case or of  rendering  any of the other  provisions  hereof
        illegal, inoperative,  unenforceable or invalid. Furthermore, in lieu of
        each illegal,  invalid,  unenforceable or inoperative  provision,  there
        shall be added  automatically,  as part of this  Agreement,  a provision
        similar in terms of such illegal, invalid,  unenforceable or inoperative
        provision as may be possible and as shall be legal,  valid,  enforceable
        and operative.

                8.11  Assignability.  Neither  this  Agreement  nor  any  of the
        parties'  rights  hereunder  shall be  assignable  by any  party  hereto

                                       58

<PAGE>

        without the prior written consent of the other parties hereto; provided,
        however,  that Buyer's or its successors' or assigns'  rights  hereunder
        may be assigned or otherwise  transferred,  in whole or in part, without
        any  other   party's   consent  (i)  to  any   successor  by  merger  or
        consolidation  or (ii) to any  individual,  partnership,  corporation or
        other entity  deriving  title from Buyer or its successors or assigns to
        all or substantially all of the assets as constituted on the date of any
        such transfer,  provided that no such assignment  shall effect a release
        of  Buyer  or  its  successors  or  assigns  from  any   liabilities  or
        obligations hereunder.

                8.12 Drafting.  The parties acknowledge and confirm that each of
        their respective  attorneys have participated  jointly in the review and
        revision of this  Agreement  and that it has not been written  solely by
        counsel for one party. The parties hereto therefore  stipulate and agree
        that the rule of  construction to the effect that any ambiguities are to
        be or may be resolved  against the drafting  party shall not be employed
        in the  interpretation  of this  Agreement  to favor any  party  against
        another.

                8.13  References.  The  use of  the  words  "hereof,"  "herein,"
        "hereunder," "herewith," "hereto," "hereby," and words of similar import
        shall  refer  to  this  entire   Amended  and  Restated  Asset  Purchase
        Agreement,  and  not to any  particular  article,  section,  subsection,
        clause,  or  paragraph  hereof,  unless the  context  clearly  indicates
        otherwise.

                8.14 Calendar Days, Weeks and Months. Unless otherwise specified
        herein,  any reference to "day",  "week", or "month" herein shall mean a
        calendar day, week or month.

                8.15 Gender;  Plural and Singular.  Where the context  hereof so
        requires, the masculine gender shall include the feminine or neuter, and
        the singular shall include the plural and the plural the singular.

                8.16 Cumulative Rights. All rights and remedies specified herein
        are  cumulative and are in addition to, not in limitation of, any rights
        or  remedies  the  parties  may have at law or in  equity,  and all such
        rights and remedies may be exercised singularly or concurrently.

                8.17 No Implied Covenants. Each party, against the other, waives
        and relinquishes any right to assert, either as a claim or as a defense,
        that  the  other   party  is  bound  to   perform   or  liable  for  the
        nonperformance  of any  implied  covenant  or  implied  duty or  implied
        obligation.

                8.18  Attorneys'  Fees.  The  prevailing  party  in any  dispute
        between the parties  arising out of the  interpretation,  application or
        enforcement of any provision  hereof shall be entitled to recover all of

                                       59

<PAGE>

        its reasonable  attorney's  fees and costs whether suit be filed or not,
        including  without  limitation  costs and attorneys'  fees related to or
        arising out of any trial or appellate proceedings.

                8.19  Indirect  Action.  Where any  provision  hereof  refers to
        action to be taken by any Person or party, or which such Person or party
        is prohibited from taking,  such provision  shall be applicable  whether
        the action in question is taken directly or indirectly by such Person or
        party.

                                  * * * * * *




                                       60
<PAGE>


        IN WITNESS WHEREOF,  the parties have executed this Agreement and caused
the same to be duly  delivered on their  behalf on the day and year  hereinabove
first set forth.


                                             SELLER:

                                             VALLEY SYSTEMS OF OHIO, INC.


                                             By:  /s/ Ed Strickland     
                                                  -----------------
                                                      Ed Strickland
                                                      President and
                                                      Chief Executive Officer


                                             VSI:

                                             VALLEY SYSTEMS, INC.


                                             By:  /s/ Ed Strickland
                                                  -----------------
                                                      Ed Strickland
                                                      President and
                                                      Chief Executive Officer



                                             BUYER:

                                             HYDROCHEM INDUSTRIAL SERVICES, INC.


                                             By:  /s/ B. Tom Carter, Jr.   
                                                  ----------------------
                                                      B. Tom Carter, Jr.
                                                      Chairman of the Board and
                                                      Chief Executive Officer



                                       61
<PAGE>


                                ESCROW AGREEMENT

                This Escrow Agreement, dated as of January 5, 1999 (the "Closing
Date"),  among  HydroChem  Industrial  Services,  Inc.,  a Delaware  corporation
("Buyer"),  Valley Systems, Inc., a Delaware corporation,  and Valley Systems of
Ohio, Inc., an Ohio corporation  (collectively,  "Seller"),  and Bank One Texas,
N.A., a national banking association, as escrow agent ("Escrow Agent").

                This is the Escrow  Agreement  referred to in the Second Amended
and Restated  Asset  Purchase  Agreement,  dated as of September 8, 1998, by and
among Buyer and Seller (the  "Purchase  Agreement").  Capitalized  terms used in
this agreement  without  definition shall have the respective  meanings given to
them in the Purchase Agreement.

                The  parties,  intending  to be legally  bound,  hereby agree as
follows:

1.      ESTABLISHMENT OF ESCROW

         (a) Buyer is  depositing  with Escrow Agent the amount of $4,000,000 in
        immediately available funds (as increased by any earnings thereon and as
        reduced by any  disbursements,  amounts  withdrawn  under  Section  5(j)
        hereof,  or losses on  investments,  the "Escrow  Fund").  Escrow  Agent
        acknowledges receipt thereof.

         (b)  Escrow  Agent  hereby  agrees to act as escrow  agent and to hold,
        safeguard,  and  disburse  the  Escrow  Fund  pursuant  to the terms and
        conditions hereof.

2.      INVESTMENT OF FUNDS

                Except  as  Buyer  and  Seller  may  from  time to time  jointly
instruct Escrow Agent in writing, the Escrow Fund shall be invested from time to
time, to the extent possible, in United States Treasury Bills having a remaining
maturity of 90 days or less and  repurchase  obligations  secured by such United
States  Treasury  Bills,  with any remainder  being  deposited and maintained in
demand deposits with Escrow Agent, until disbursement of the entire Escrow Fund.
Escrow  Agent is  authorized  to  liquidate  in  accordance  with its  customary
procedures  any portion of the Escrow Fund  consisting of investments to provide
for payments required to be made under this Agreement.

3.      CLAIMS

         (a) From time to time on or before the third anniversary of the date of
        this Agreement,  Buyer may give notice (a "Notice") to Seller and Escrow
        Agent  specifying in  reasonable  detail the nature and dollar amount of
        any Claim it may have under the terms of the Purchase  Agreement;  Buyer
        may make more than one claim  with  respect to any  underlying  state of
        facts.  If Seller gives notice to Buyer and Escrow Agent  disputing  any
        Claim (a  "Counter  Notice")  within ten (10)  business  days  following
        receipt by Escrow Agent of the Notice  regarding such Claim,  such Claim
        shall be  resolved as provided  in Section  3(b)  hereof.  If no Counter
        Notice is received by Escrow  Agent within such ten business day period,
        then the dollar  amount of damages  claimed by Buyer as set forth in its
        Notice shall be deemed

                                        1

<PAGE>



        established  for purposes of this  Agreement and the Purchase  Agreement
        and, at the end of such ten business day period,  Escrow Agent shall pay
        to Buyer the dollar  amount  claimed in the Notice from (and only to the
        extent of) the Escrow  Fund.  Escrow  Agent  shall not  inquire  into or
        consider  whether a Claim complies with the requirements of the Purchase
        Agreement.

         (b) If a Counter Notice is given with respect to a claim,  Escrow Agent
        shall make  payment with respect  thereto  only in  accordance  with (i)
        joint  written  instructions  of  Buyer  and  Seller  or  (ii)  a  final
        non-appealable  order of a court of  competent  jurisdiction.  Any court
        order  shall  be  accompanied  by a legal  opinion  by  counsel  for the
        presenting party satisfactory to the Escrow Agent to the effect that the
        order is final and non-appealable.  Escrow Agent shall act on such court
        order without further question.

4.      RELEASE OF ESCROW

         (a)(i)  Provided no dispute or disputes  in excess of an  aggregate  of
        $3,000,000  (or  $2,000,000,  if that part of the Escrow Fund subject to
        Section 4(b) below has been released to Seller),  less the amount of any
        payments  theretofore  made in satisfaction of Seller's  indemnification
        and guaranty  obligations,  exist as to any Claim or Claims by any Buyer
        Indemnitee  against  all or a portion  of the  Escrow  Fund on the first
        anniversary of the Closing Date, then $1,000,000, less the amount of any
        payments  in  satisfaction  of  Seller's  indemnification  and  guaranty
        obligations,  will be  released  to  Seller on the  first  business  day
        following such first anniversary of the Closing Date. To the extent such
        a  dispute  or  disputes  do exist as to a Claim or  Claims on the first
        anniversary  of the Closing  Date, an amount equal to the amount of such
        Claim or Claims (or if the amount of said Claims  cannot be  quantified,
        then  Buyer's  reasonable,  good  faith  estimate  of the  amount of the
        Claims) will be withheld  from such  partial  release of the Escrow Fund
        and will  continue to be held in accordance  with the  provisions of the
        Escrow Agreement until such claim or claims have been fully resolved and
        the balance of the partial release will be paid to Seller.

         (ii)  Provided  no dispute or  disputes  in excess of an  aggregate  of
        $2,000,000  (or  $1,000,000,  if that part of the Escrow Fund subject to
        Section 4(b) below has been released to Seller),  less the amount of any
        payments  theretofore  made in satisfaction of Seller's  indemnification
        and guaranty  obligations,  exist as to any Claim or Claims by any Buyer
        Indemnitee  against  all or a portion of the  Escrow  Fund on the second
        anniversary of the Closing Date, then an additional $1,000,000, less the
        amount of any  payments  theretofore  made in  satisfaction  of Seller's
        indemnification and guaranty obligations,  will be released to Seller on
        the first business day following such second  anniversary of the Closing
        Date. To the extent such a dispute or disputes do exist as to a Claim or
        Claims on the second anniversary of the Closing Date, an amount equal to
        the  amount of such Claim or Claims  (or if the  precise  amount of said
        Claims  cannot  be  quantified,  then  Buyer's  reasonable,  good  faith
        estimate of the amount of the Claims) will be withheld from such partial
        release of the Escrow Fund and will  continue  to be held in  accordance
        with the provisions of the Escrow  Agreement  until such claim or claims
        have been fully resolved and the balance of the partial  release will be
        paid to Seller.


                                        2

<PAGE>



         (iii)  Provided no dispute or disputes  exist as to any Claim or Claims
        by any Buyer  Indemnitee  against all or a portion of the Escrow Fund on
        the third  anniversary  of the Closing  Date,  then the remainder of the
        Escrow  Fund  will be  released  to Seller  on the  first  business  day
        following  such third  anniversary  of the  Closing  Date and the Escrow
        Agreement shall thereupon terminate. To the extent a dispute or disputes
        do exist as to a Claim or Claims on the third anniversary of the Closing
        Date,  an amount  equal to the amount of such Claim or Claims (or if the
        amount of said Claims  cannot be  quantified,  then Buyer's  reasonable,
        good faith  estimate of the amount of the Claims) will be withheld  from
        such partial  release of the Escrow Fund and will continue to be held in
        accordance with the provisions of the Escrow  Agreement until such claim
        or claims  have been  fully  resolved  and the  balance  of the  partial
        release will be paid to Seller.

         (b) Upon delivery to Escrow Agent and to Buyer of Seller's  certificate
        pursuant  to the  terms  of  Section  5.3.6  of the  Purchase  Agreement
        certifying that the  Environmental  Remediation  has been completed,  an
        amount equal to  $1,000,000,  less the sum of (i) the aggregate  cost of
        such  Environmental  Remediation  (including  the  Estimated  Additional
        Remediation  Cost) and (ii) the aggregate  amount of other Losses of all
        other Buyer Indemnitees  subject to indemnification  pursuant to Section
        4.1 of the Purchase  Agreement in excess of $3,000,000,  shall forthwith
        be  released  to Seller out of the Escrow  Fund.  In the event that such
        Environmental  Remediation was not completed at the first anniversary of
        the  Closing  Date,  Seller  shall  deliver  to Buyer a  certificate  of
        completion  thereof upon such  completion  containing a statement of the
        aggregate cost of the Environmental  Remediation effected following such
        first anniversary,  and Buyer shall immediately release to Seller out of
        the Escrow Fund the amount,  if any,  which would have been  released to
        Seller under  Section  5.3.6 of the Purchase  Agreement  following  such
        first  anniversary  had such  actual  cost,  rather  than the  Estimated
        Additional Remediation Cost, been used in such calculation.

5.      DUTIES OF ESCROW AGENT

         (a) Escrow  Agent  shall not be under any duty to give the Escrow  Fund
        held by it  hereunder  any greater  degree of care than it gives its own
        similar  property  and shall not be  required  to invest  any funds held
        hereunder  except as directed in this Agreement.  Uninvested  funds held
        hereunder shall not earn or accrue interest.

         (b)  Escrow  Agent  shall  not be  liable,  except  for its  own  gross
        negligence  or willful  misconduct  and,  except with  respect to claims
        based  upon  such  gross  negligence  or  willful  misconduct  that  are
        successfully asserted against the Escrow Agent, the other parties hereto
        shall jointly and severally indemnify and hold harmless the Escrow Agent
        (and any  successor  to the Escrow  Agent)  from and against any and all
        losses,  liabilities,  claims, actions, damages and expenses,  including
        reasonable  attorneys'  fees and  disbursements,  arising  out of and in
        connection with this Agreement.  Without limiting the foregoing,  Escrow
        Agent shall in no event be liable in connection  with its  investment or
        reinvestment  of any  cash  held  by it  hereunder  in  good  faith,  in
        accordance with the terms hereof,  including,  without  limitation,  any
        liability  for any delays (not  resulting  from its gross  negligence or
        willful misconduct) in

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<PAGE>



        the  investment  or  reinvestment  of  the  Escrow Fund,  or any loss of
        interest incident to any such delays.

         (c) Escrow  Agent shall be  entitled to rely upon any order,  judgment,
        certification,  demand, notice, instrument or other writing delivered to
        it hereunder without being required to determine the authenticity or the
        correctness  of any fact stated  therein or the propriety or validity of
        the  service  thereof.  Escrow  Agent  may  act  in  reliance  upon  any
        instrument or signature believed by it to be genuine and may assume that
        the person purporting to give receipt or advice or make any statement or
        execute any document in connection  with the provisions  hereof has been
        duly authorized to do so. Escrow Agent may conclusively presume that the
        undersigned  representative of any party hereto which is an entity other
        than a natural  person has full power and  authority to instruct  Escrow
        Agent on behalf of that party unless  written  notice to the contrary is
        delivered to Escrow Agent.

         (d) Escrow Agent may act pursuant to the advice of counsel with respect
        to any matter relating to this Agreement and shall not be liable for any
        action  taken or  omitted by it in good  faith in  accordance  with such
        advice.

         (e)  Escrow  Agent  does not  have  any  interest  in the  Escrow  Fund
        deposited hereunder but is serving as escrow holder only and having only
        possession  thereof.  Any payments of income from this Escrow Fund shall
        be  subject to  withholding  regulations  then in force with  respect to
        United States taxes.  The parties  hereto will provide Escrow Agent with
        appropriate  Internal  Revenue Service Forms W-9 for tax  identification
        number certification, or non-resident alien certifications. This Section
        5(e)  and  Section  5(b)  hereof  shall  survive   notwithstanding   any
        termination of this Agreement or the resignation of Escrow Agent.

         (f) Escrow Agent makes no  representation  as to the  validity,  value,
        genuineness,  or the collectability of any security or other document or
        instrument held by or delivered to it.

         (g) Escrow Agent shall not be called upon to advise any party as to the
        wisdom in selling or retaining or taking or  refraining  from any action
        with respect to any securities or other property deposited hereunder.

         (h) Escrow  Agent (and any  successor  to the Escrow  Agent) may at any
        time  resign as such by  delivering  the  Escrow  Fund to any  successor
        Escrow Agent jointly  designated by the other parties hereto in writing,
        or to any court of competent jurisdiction,  whereupon Escrow Agent shall
        be  discharged  of and from any and all further  obligations  arising in
        connection  with this  Agreement.  The  resignation of Escrow Agent will
        take effect on the earlier of (a) the appointment of a successor  escrow
        agent (including a court of competent jurisdiction) or (b) the day which
        is 30  days  after  the  date  of  delivery  of its  written  notice  of
        resignation  to the other parties  hereto.  If at that time Escrow Agent
        has not  received a  designation  of a successor  Escrow  Agent,  Escrow
        Agent's  sole  responsibility  after  that time  shall be to retain  and
        safeguard the Escrow Fund until receipt of a designation of successor

                                        4

<PAGE>



        Escrow Agent or a joint  written  disposition  instruction  by the other
        parties hereto or a final  non-appealable  order of a court of competent
        jurisdiction.

         (i) In the event of any  disagreement  between the other parties hereto
        resulting in adverse claims or demands being made in connection with the
        Escrow  Fund or in the event  that  Escrow  Agent is in doubt as to what
        action it should  take  hereunder,  Escrow  Agent  shall be  entitled to
        retain the Escrow  Fund until  Escrow  Agent shall have  received  (i) a
        final  non-appealable  order  of  a  court  of  competent   jurisdiction
        directing  delivery  of the  Escrow  Fund  or (ii) a  written  agreement
        executed by the other parties  hereto  directing  delivery of the Escrow
        Fund,  in which event  Escrow  Agent shall  disburse  the Escrow Fund in
        accordance  with  such  order or  agreement.  Any court  order  shall be
        accompanied  by a legal  opinion by  counsel  for the  presenting  party
        satisfactory  to Escrow  Agent to the effect that the order is final and
        non-appealable.  Escrow  Agent  shall act on such court  order and legal
        opinion without further question.

         (j) Buyer and Seller shall pay Escrow Agent compensation (as payment in
        full) for the services to be rendered by Escrow  Agent  hereunder in the
        amount of $2,500 at the time of execution of this  Agreement  and $2,500
        annually  thereafter  and  agree  to  reimburse  Escrow  Agent  for  all
        reasonable  expenses,  disbursements  and  advances  incurred or made by
        Escrow  Agent  in  performance  of  its  duties   hereunder   (including
        reasonable fees,  expenses and  disbursements of its counsel).  Any such
        compensation  and  reimbursement to which Escrow Agent is entitled shall
        be evenly split by Buyer and Seller.

         (k) No  printed or other  matter in any  language  (including,  without
        limitation,  prospectuses,  notices,  reports and promotional  material)
        that mentions  Escrow Agent's name or the rights,  powers,  or duties of
        Escrow  Agent  shall be issued by the  other  parties  hereto or on such
        parties'  behalf unless Escrow Agent shall first have given its specific
        written consent thereto.

         (l) The other parties hereto authorize Escrow Agent, for any securities
        held  hereunder,  to use  the  services  of any  United  States  central
        securities  depository  it  reasonably  deems  appropriate,   including,
        without limitation, the Depositary Trust Company and the Federal Reserve
        Book Entry System.

6.      LIMITED RESPONSIBILITY

                This  Agreement  expressly  sets  forth all the duties of Escrow
Agent with respect to any and all matters pertinent hereto. No implied duties or
obligations shall be read into this Agreement against Escrow Agent. Escrow Agent
shall not be bound by the  provisions of any  agreement  among the other parties
hereto except this Agreement.

7.      OWNERSHIP FOR TAX PURPOSES

                Seller  agrees  that,  for  purposes  of federal and other taxes
based on income,  Seller  will be treated as the owner of the Escrow  Fund,  and
that Seller will report all income, if any, that is

                                        5

<PAGE>



earned on, or derived from, the Escrow Fund as its income in the taxable year or
years in which such income is properly includible and pay any taxes attributable
thereto.

8.      NOTICES

                All notices,  consents,  waivers and other  communications under
this  Agreement  must be in  writing  and will be deemed to have been duly given
when (a) delivered by hand (with written  confirmation of receipt),  (b) sent by
telecopier (with written  confirmation of receipt),  or (c) when received by the
addressee,  if  sent  by a  nationally  recognized  overnight  delivery  service
(receipt  requested),  in each case to the appropriate  addresses and telecopier
numbers set forth below (or to such other addresses and telecopier  numbers as a
party may designate by notice to the other parties):

        Seller:

        Valley Systems, Inc.
        Valley Systems of Ohio, Inc.
        11580 Lafayette Drive, NW
        Canal Fulton, Ohio 44614
        Attention: Chief Executive Officer
        Facsimile No.: (330) 854-3444

        with a copy to:

        Arnall Golden & Gregory, LLP
        2800 One Atlantic Center
        1201 West Peachtree Street
        Atlanta, Georgia 30309
        Attention: Jonathan Golden
        Facsimile No.: (404) 873-8701

        Buyer:

        HydroChem Industrial Services, Inc.
        5956 Sherry Lane
        Suite 930
        Dallas, Texas 75225
        Attention: Chief Executive Officer
        Facsimile No.: (214) 361-4715

        with a copy to:

        Haynes and Boone, LLP
        600 Congress Avenue
        Suite 1600
        Austin, Texas 78701

                                        6

<PAGE>



        Attention: Dennis R. Cassell
        Facsimile No.:  (512) 867-8470

        Escrow Agent:

        Bank One Texas, N.A.
        910 Travis Street
        5th Floor
        Houston, Texas  77002
        Attention:  Josie Hixon
        Facsimile No.:  (713) 751-3930

9.      JURISDICTION; SERVICE OF PROCESS

                Any action or proceeding seeking to enforce any provision of, or
based on any right arising out of, this Agreement may be brought  against any of
the parties in the courts of the State of Texas, County of Dallas, or, if it has
or can  acquire  jurisdiction,  in the  United  States  District  Court  for the
Northern District of Texas, and each of the parties consents to the jurisdiction
of such courts (and of the appropriate  appellate  courts) in any such action or
proceeding and waives any objection to venue laid therein. Process in any action
or proceeding  referred to in the preceding  sentence may be served on any party
anywhere in the world.

10.     COUNTERPARTS

                This Agreement may be executed in one or more counterparts, each
of which will be deemed to be an original and all of which, when taken together,
will be deemed to constitute one and the same.

11.     SECTION HEADINGS

                The  headings of sections in this  Agreement  are  provided  for
convenience only and will not affect its construction or interpretation.

12.     WAIVER

                The rights and  remedies  of the parties to this  Agreement  are
cumulative and not  alternative.  Neither the failure nor any delay by any party
in  exercising  any right,  power,  or  privilege  under this  Agreement  or the
documents  referred to in this Agreement will operate as a waiver of such right,
power, or privilege, and no single or partial exercise of any such right, power,
or privilege will preclude any other or further  exercise of such right,  power,
or privilege or the exercise of any other right,  power,  or  privilege.  To the
maximum extent permitted by applicable law, (a) no claim or right arising out of
this Agreement or the documents  referred to in this Agreement can be discharged
by one party,  in whole or in part, by a waiver or  renunciation of the claim or
right  unless in writing  signed by the other  party;  (b) no waiver that may be
given by a party will be applicable except in the specific instance for which it
is given; and (c) no notice to or demand on one party will be deemed

                                        7

<PAGE>



to be a waiver  of any  obligation  of such  party or of the  right of the party
giving such notice or demand to take further  action without notice or demand as
provided in this Agreement or the documents referred to in this Agreement.

13.     EXCLUSIVE AGREEMENT AND MODIFICATION

                This Agreement supersedes all prior agreements among the parties
with respect to its subject  matter and  constitutes  (along with the  documents
referred to in this  Agreement) a complete and exclusive  statement of the terms
of the agreement  between the parties with respect to its subject  matter.  This
Agreement  may not be  amended  except by a written  agreement  executed  by the
Buyer, the Seller and the Escrow Agent.

14.     GOVERNING LAW

                This  Agreement  shall be  governed  by the laws of the State of
Texas, without regard to conflicts of law principles.

                                   * * * * * *

                                        8

<PAGE>


                IN WITNESS WHEREOF, the parties have executed and delivered this
Agreement as of the date first written above.


HYDROCHEM INDUSTRIAL                         VALLEY SYSTEMS, INC.
SERVICES, INC.


By:     /s/ B. Tom Carter, Jr.               By:    /s/ Ed Strickland           
        ------------------------                    ----------------------
        B. Tom Carter, Jr.                              Ed Strickland
        Chairman of the Board and                       President and 
        Chief Executive Officer                         Chief Executive Officer


BANK ONE TEXAS, N.A.                         VALLEY SYSTEMS OF OHIO, INC.


By:                                          By:    /s/ Ed Strickland           
        ------------------------                    ----------------------
        Name:                                           Ed Strickland
        Title:                                          President and
                                                        Chief Executive Officer



                                        9

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