ATC GROUP SERVICES INC /DE/
424B3, 1997-08-19
TESTING LABORATORIES
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ATC Group Services Inc.                                               PROSPECTUS

                                 568,207 Shares
                                  Common Stock

     This Prospectus of ATC Group Services Inc.  ("ATC") relates to the exercise
of 568,207 shares of ATC Common Stock issuable upon exercise of a like number of
Class C Redeemable  Common Stock  Purchase  Warrants  (the "Class C Warrants" or
"Warrants").  Each Class C Warrant  entitles the holder to purchase one share of
ATC Common  Stock at an  exercise  price of $10.00 per share  until  January 11,
1992,  which date was extended by the Board of Directors until January 11, 1993,
January 11, 1994,  September 30, 1994,  September  30, 1996,  April 30, 1997 and
which  date  was  later  extended  by  the  Board  until  April  30,  1998.  (No
consideration  was  received  by ATC  to  extend  the  expiration  dates  of the
Warrants.)  ATC has the right to redeem the Class C Warrants at a price of $.001
per Warrant at any time upon 30 days prior written notice. The exercise price of
the Warrants was arbitrarily  determined by ATC at the time of original issuance
and bears no relationship to the current book value, assets, or other recognized
criteria of value. See "Risk Factors" and "Description of Capital Stock."


     The Common Stock is quoted on the Nasdaq  National  Market under the symbol
"ATCS."  The last  reported  sale price of the Common  Stock on July 23, 1997 as
reported by the Nasdaq National  Market,  was $11.00 per share. See "Price Range
of Common Equity."


     For a discussion of certain  material  factors that should be considered in
connection with an investment in the Common Stock, see "Risk Factors" commencing
on page 7 hereof.
___________

THESE  SECURITIES  HAVE NOT BEEN APPROVED OR  DISAPPROVED  BY THE SECURITIES AND
EXCHANGE  COMMISSION OR ANY STATE  SECURITIES  COMMISSION NOR HAS THE SECURITIES
AND  EXCHANGE  COMMISSION  OR ANY STATE  SECURITIES  COMMISSION  PASSED UPON THE
ACCURACY OR ADEQUACY OF THIS PROSPECTUS. ANY REPRESENTATION TO THE CONTRARY IS A
CRIMINAL OFFENSE.

RESIDENTS OF THE STATE OF NEW JERSEY MAY ONLY EXERCISE THEIR WARRANTS  THROUGH A
BROKER/DEALER  REGISTERED  IN THE  STATE OF NEW  JERSEY OR IN  RELIANCE  UPON AN
EXEMPTION  OR EXCEPTION  UNDER  N.J.S.A.  (NEW JERSEY  STATUTES,  ANNOTATED,  AS
AMENDED)  49:3-47  ET.SEQ.  HOWEVER,  ATC DOES NOT INTEND TO PAY  BROKER/DEALERS
SOLICITATION FEES FOR THE EXERCISE OF ITS WARRANTS.


RESIDENTS OF THE STATE OF MARYLAND MAY ONLY EXERCISE  THEIR  WARRANTS  THROUGH A
BROKER/DEALER  REGISTERED  IN THE  STATE  OF  MARYLAND  OR IN  RELIANCE  UPON AN
EXEMPTION OR EXCEPTION UNDER THE ANNOTATED CODE OF MARYLAND, AS AMENDED.


RESIDENTS  OF THE STATE OF HAWAII MAY ONLY  EXERCISE  THEIR  WARRANTS  THROUGH A
BROKER/DEALER  REGISTERED  IN THE  STATE  OF  HAWAII,  OR IN  RELIANCE  UPON  AN
EXEMPTION OR EXCEPTION UNDER THE HAWAII REVISED STATUTES.

         Security  holders who desire to exercise their Warrants  should execute
the  Subscription  Form  contained in the security and submit same together with
any appropriate  check made payable to "ATC Group Services Inc." to the transfer
agent,  American Stock Transfer & Trust Co., 40 Wall Street,  New York, New York
10005.  ATC does not  intend  to pay  broker-dealers  solicitation  fees for the
exercise of its Warrants. See "Plan of Distribution."

                  The date of this Prospectus is August 5, 1997

                                                             1

<PAGE>
                              AVAILABLE INFORMATION

         ATC is  subject to the  informational  requirements  of the  Securities
Exchange  Act of 1934,  as  amended  (the  "Exchange  Act"),  and in  accordance
therewith files periodic reports,  proxy statements,  and other information with
the Securities and Exchange  Commission  (the  "Commission").  The  Registration
Statement (as defined below),  of which this Prospectus forms a part, as well as
reports,  proxy statements and other  information filed by ATC, may be inspected
and copied at the public  reference  facilities  maintained by the Commission at
450 Fifth Street, N.W.,  Washington,  DC 20549 and at the Commission's  regional
offices at 500 West Madison Street, Suite 1400, Chicago, Illinois 60661-2511 and
7 World  Trade  Center,  New York,  NY 10048.  Copies  of such  material  can be
obtained at prescribed rates from the Public Reference Section of the Commission
at 450 Fifth Street, N.W.,  Washington,  DC 20549. Material filed electronically
through Edgar (Electronic Data Gathering Analysis and Retrieval System) may also
be   accessed   through   the  SEC's   home  page  on  the  World  Wide  WEB  at
http://www.sec.gov.

         ATC has filed with the Commission a Registration  Statement on Form S-3
(herein,  together  with  all  amendments  and  exhibits,  referred  to  as  the
"Registration  Statement")  under the  Securities  Act of 1933,  as amended (the
"Securities  Act"),  with respect to the Common Stock being offered  pursuant to
this Prospectus.  This Prospectus does not contain all the information set forth
in the Registration Statement,  certain parts of which are omitted in accordance
with the rules and regulations of the Commission. The Registration Statement may
be inspected  and copies at the public  reference  facilities  maintained by the
Commission  at the  address  set forth in the  preceding  paragraph.  Statements
contained herein  concerning the provisions of any documents are not necessarily
complete and, in each  instance,  reference is made to the copy of such document
filed as an exhibit to the  Registration  Statement or otherwise  filed with the
Commission. Each such statement is qualified in its entirety by such reference.



                                                         2

<PAGE>

                INCORPORATION OF CERTAIN INFORMATION BY REFERENCE

         The  following   documents  filed  with  the  Securities  and  Exchange
Commission  (the  "Commission")  (File No.  1-10583)  pursuant to the Securities
Exchange Act of 1934, as amended (the "Exchange Act"),  are incorporated  herein
by reference:

         1.       The Company's Annual Report on Form 10-K, as amended, for the 
fiscal year ended February 28, 1997;

         2.       The Company's Form 10-Q for its quarter ended May 31, 1997;

         3.       The Company's Form 8-K/A#2 (date of earliest event reported - 
May 24, 1996); and

         4.  All  documents  filed  by ATC  after  the  date of this  Prospectus
pursuant to Sections  13(a),  13(c),  14 and 15(d) of the Exchange Act, prior to
the filing of a  post-effective  amendment which indicates that all Common Stock
offered  hereby has been sold or which  deregisters  such  stock then  remaining
unsold,  shall be deemed to be incorporated herein by reference and to be a part
hereof from the date of such documents.

         Any  statement  contained  in a document  incorporated  or deemed to be
incorporated  by reference  herein shall be deemed to be modified or  superseded
for purposes of this Prospectus to the extent that a statement  contained herein
or in any other  subsequently  filed  document  which also is or is deemed to be
incorporated by reference herein modifies or supersedes such statement. Any such
statements as modified or superseded  shall be deemed,  except as so modified or
superseded, to constitute a part of this Prospectus.

         ATC  will  provide  without  charge  to  each  person,   including  any
beneficial  owner, to whom a copy of this Prospectus is delivered,  upon written
or oral request of such person,  a copy of any or all of the documents  referred
to above  which have or may be  incorporated  by  reference  in this  Prospectus
(other  than  certain  exhibits  to such  documents  unless  such  exhibits  are
specifically  incorporated by reference into the information that the Prospectus
incorporates).  Requests for such documents may be made by writing ATC, 104 East
25th Street, Tenth Floor, New York, NY 10010 (Attention:
Shareholder Relations) or by calling (212) 353-8280.


                                                         3

<PAGE>



                                   THE COMPANY

         ATC Group  Services  Inc.  ("ATC" or the  "Company")  is a  specialized
national  provider  of  technical  and project  management  services to a large,
diverse  customer  base of  Fortune  500  corporations,  other  businesses,  and
federal,  state and government agencies.  ATC's technical and project management
services consist primarily of environmental and consulting  engineering services
(doing business as ATC Associates)  and information  technology  services (doing
business through ATC's wholly owned subsidiary ATC InSys Technology Inc.). These
services are offered to national,  regional and local clients  through 63 branch
offices in 30 states.  ATC has grown in recent years through internal  expansion
and  through  the  acquisition  of  businesses  primarily  in the  environmental
engineering and consulting  industries.  The acquisition of American Testing and
Engineering  Corporation ("ATEC") and 3D Information Services,  Inc. in May 1996
expanded  ATC's  service  offerings  to the  construction  material  testing and
engineering areas and the information technology consulting sector.

          ATC  has   focused   on  six  areas  of   specialization   within  its
environmental and information technology segments as follows:

          (i) Environmental  engineering and consulting including  environmental
audits,  site   assessments,  remedial  action planning and design, and soil and
groundwater remediation management;

          (ii)     Industrial hygiene consulting including asbestos management,
classical industrial hygiene and indoor air quality;

          (iii)  Construction  materials  engineering and testing  involving the
design and analysis of building  materials used in the upgrade of the U.S. aging
infrastructure  and the needs of emerging  industry sectors such as those of the
Personal Communications Services ("PCS")/Wireless communications industry;

         (iv)   Lead-based paint risk management;

         (v) Health and safety consulting, including health and safety training,
hazardous materials site safety planning and industrial safety consulting; and

         (vi)  Information  technology  consulting  encompassing  system design,
development, maintenance, and management services.

         These areas of specialization  contributed approximately 41%, 33%, 15%,
3%, 2%, and 6% respectively, of the Company's revenues in fiscal 1997.



                                                         4

<PAGE>



         The Company has experienced  substantial  increases in revenues and net
income  over the past three  fiscal  years.  ATC's  revenues  were  $36,271,557,
$44,964,897, and $113,855,364,  respectively,  in its 1995, 1996 and 1997 fiscal
years,  representing  a compounded  annual  growth rate of 46% over this period.
Furthermore,  ATC's net  income  was  $3,256,520,  $3,865,998,  and  $6,307,734,
respectively, in such fiscal years, representing a compounded annual growth rate
of 25% over such periods.

         ATC  attributes  these  positive  operating  results to its  integrated
strategy that includes:

         (i)    Aggressive, but disciplined acquisitions program;

         (ii)   Enhancement of operations by integrating acquired businesses
with the Company's existing operations;

         (iii)  Enhancement of revenues by cross selling of newly acquired
services to existing clients;

         (iv)  Focus on  certain  higher  growth  sectors  of the  environmental
consulting and engineering  services market,  and certain higher margin services
such as policy development and decision support;

         (v)  Emphasis on basic  business  management  issues,  such as employee
utilization,  credit and  collections  management,  and regional  profit  center
accountability;

         (vi)  Utilization of its position as one of the few national  providers
in  a  market  typified  by  local  and  regional  firms  to  provide   complete
environmental  management  services  to major  corporations  with  national  and
international property management needs, and

         (vii) Development of an information  technology  consulting practice to
extend the  Company's  services  into a higher  growth  market while  helping to
differentiate  its offerings in the  environmental  consulting  and  engineering
services markets.

         The  Company  intends to employ  this  strategy  as it seeks to further
penetrate the markets for its core services and expand its range of products and
services through strategic acquisitions and internal growth.


                                                         5

<PAGE>



         Unless  otherwise  indicted,  all  references  herein  to  "ATC" or the
"Company" refer to ATC Group Services   Inc., its subsidiaries and predecessors.
The  Company's  principal  executive  office is located at 104 East 25th Street,
Tenth  Floor,  New  York,  New York  10010  and its  telephone  number  is (212)
353-8280.

                                  The Offering




Common Stock Offered by the Company................. 568,207 shares

Common Stock Outstanding Before
  the Offering...................................... 7,802,987 shares (1)

Common Stock to be Outstanding after the Offering... 8,371,194 shares (2)

Use of Proceeds..................................... For general working capital
                                                     and/or acquisition purposes


Nasdaq National Market Symbol....................... Common Stock - "ATCS"
                                                     Class C Warrants - "ATCSL"

================================================================================

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

(1)      Represents  shares  outstanding  on June 6,  1997 and does not  include
         shares  reserved  for  issuance  under  outstanding  warrants and stock
         options.

(2)      Assumes the exercise of all Class C Warrants.

                                                         6

<PAGE>


                                  RISK FACTORS

         In evaluating  an investment in the Common Stock being offered  hereby,
investors  should  consider  carefully,  among other things,  the following risk
factors,  as well as the other information  contained in this Prospectus and the
documents   incorporated   herein  by  reference.   This   Prospectus   contains
forward-looking statements which involve risks and uncertainties.  The Company's
actual  results  may differ  significantly  from the  results  discussed  in the
forward-looking statements.  Factors that might cause such a difference include,
but are not limited to, those discussed in "Risk Factors."


Growth and Acquisition Risks

         One of the Company's primary strategies is to pursue the acquisition of
other  companies  or  assets  that  either  complement  or expand  its  existing
business.   The  Company  completed  three  acquisitions  in  fiscal  1995,  two
acquisitions in fiscal 1996, (excluding a merger with Aurora Environmental Inc.,
which at the time of the merger owned  approximately 57% of ATC and had no other
business operations except those conducted through ATC and its subsidiaries) and
two   acquisitions  in  fiscal  1997.  The  Company  has  also  had  preliminary
acquisition  discussions  with or has  evaluated the  potential  acquisition  of
numerous other  companies over the past several years.  The Company is unable to
predict the likelihood of a material  acquisition being completed in the future.
If the Company  proceeds  with an  acquisition  for cash,  the Company may use a
portion  or all of the  proceeds  the  Company  receives  from the  exercise  of
Warrants to consummate such transaction.  See "Use of Proceeds." The Company may
also seek to finance  any such  acquisition  through  additional  debt or equity
financings.

         The  Company  anticipates  that  one  or  more  potential   acquisition
opportunities,  including those that would be material,  may become available in
the  near  future.  If and when  appropriate  acquisition  opportunities  become
available, the Company intends to pursue them actively. Although the Company has
successfully completed several acquisitions,  there can be no assurance that the
Company  will be able to  identify,  acquire  or  profitably  manage  additional
companies  or  successfully  integrate  such  additional  companies  into  ATC's
operations  without  substantial costs,  delays or other problems.  In addition,
there can be no assurance that any companies  acquired will be profitable at the
time of their acquisition or will achieve sales and  profitability  that justify
the  investment  therein.  Acquisitions  may involve a number of special  risks,
including adverse effects on the Company's reported operating results, diversion
of management's attention,  dependence on retention and hiring of key personnel,
risks  associated  with   unanticipated   problems  or  legal   liabilities  and
amortization of acquired  intangible  assets,  some or all of which could have a
material adverse effect on the Company's  operations and financial  performance.
The expansion of the  Company's  operations,  whether  through  acquisitions  or
internal  growth,  may place  substantial  burdens on the  Company's  management
resources  and financial  controls.  There is no assurance  that the  increasing
burdens on the Company's  management  resources and financial  controls will not
have an adverse effect on the Company's operations. See "Use of Proceeds."

                                                         7

<PAGE>

Risks Associated with Expansion of Information Consulting Services

         The Company intends to significantly  expand its presence as a provider
of information  technology  consulting  services,  both through  acquisition and
through internal growth.  Since the Company's  management has limited experience
in  acquiring  or managing  information  technology  consulting  services,  such
acquisitions are likely to subject the Company to additional  acquisition  risks
and there can be no assurance  that any such  acquisition  will be successful in
enhancing the Company's business.

         The Company's  success in the information  consulting  services markets
will depend in part on its ability to develop information  consulting  solutions
which  keep  pace  with  the  continuing   changes  in  information   processing
technology,  evolving industry standards, and changing client preferences. There
can be no assurance  that the Company will be  successful  in  addressing  these
developments  in a timely manner or that,  if it does address them,  the Company
will be successful in the marketplace. The Company's delay or failure to address
these  developments  could  have a  material  adverse  effect  on the  Company's
business,  financial  condition  and  results  of  operations.  There  can be no
assurance  that  products or  technologies  developed by third  parties will not
render the Company's services noncompetitive or obsolete.

Potential Liability and Insurance

         The  Company  is engaged in a wide  range of  advisory  services,  from
lead-based  paint risk  management and  industrial  hygiene to health and safety
training  programs  to  geotechnical  and  construction  materials  testing  and
engineering.  Due to the nature of the Company's  services,  ATC is exposed to a
significant risk of professional  liability for environmental  damage,  property
damage,  personal  injury and economic loss which may  substantially  exceed the
fees derived from such  services.  ATC has secured a "claims made"  professional
liability  insurance  policy  covering a two year term,  including  contractor's
pollution liability coverage, with a two-year,  per-claim and aggregate limit of
$10,000,000 and a deductible of $250,000,  although  increased  limits have been
obtained on a specific endorsement basis to meet the needs of particular clients
or contracts.  A "claims made" policy only insures  against  claims filed during
the period in which the policy is in effect.  This policy covers both errors and
omissions and  products/completed  operations.  ATC also carries occurrence form
general  liability  insurance in the amount of  $1,000,000,  with a  $10,000,000
umbrella.  ATC's policy has been renewed in each of the last several  years that
the policy has been in effect.  The  relatively  low dollar amount of the policy
limit currently offered,  the possible future  unavailability or modification of
this  insurance  or any  significant  increase in  insurance  rates could have a
materially  adverse effect on ATC's operations.  Further,  because customers may
require   that  ATC  maintain   liability   insurance,   the   possible   future
unavailability of such insurance could adversely affect ATC's ability to compete
effectively. ATC currently has two professional liability claims pending. One of
these claims is the Commonwealth of Massachusetts v. TLT Construction Corp. case
described  in Item 3 of ATC's Form 10-K for its fiscal year ended  February  28,
1997 and in Part II of its Form 10-Q for the  quarter  ended May 31,  1997.  The
second  claim  involves  a minor  matter  from  which the risk of major  loss is
remote. Although

                                                         8

<PAGE>



various  claims have been made in the past  against the  Company's  professional
liability/contractor's pollution policy, to date no such claim has ever resulted
in an insured loss.

Changing Regulatory Environment

         The growth of the  environmental  consulting and  engineering  services
industry has been largely attributed to the increase in environmental regulation
and  the  response  of  governmental  and  commercial   entities  and  financial
institutions to public concern with environmentally contaminated facilities. The
demand for environmental  consulting and engineering services has been, in part,
the result of facility  owners or operators  attempting  to comply with or avoid
liability under environmental regulations at the federal, state or local levels.
Because of the burden imposed with respect to complying  with such  regulations,
various  groups have sought to relax or repeal  certain  forms of  environmental
regulation. There can be no assurance that such regulation will not be curtailed
in the future.  While the Company  believes  that the demand for its services is
also attributable to factors other than regulatory  compliance,  there can be no
assurance that changes in  environmental  laws and regulations  would not have a
material adverse effect on the Company's business.

Potential Environmental Liability

         The  Company's  operations  include  advising  clients on the handling,
storage and disposal of hazardous  material,  toxic wastes and other  pollutants
and the  remediation of  contamination.  These services may expose the Company's
employees and others to dangerous elements and may involve a significant risk to
the Company for liability for environmental  damage,  personal injury,  property
damage  and  fines and costs  imposed  by  regulatory  agencies.  Claims  may be
asserted  against the Company under federal and state statutes and  regulations,
common law, contractual indemnification agreements or otherwise. There can be no
assurance that the Company will not be subject to claims which could  materially
and adversely affect the operations of the Company.

Attraction and Retention of Professional Personnel

         The  Company's  ability to  attract  and  retain  qualified  engineers,
scientists, and other professionals, either through direct hiring or acquisition
of other firms  employing  such  professionals,  will be an important  factor in
determining the Company's future success.  There is significant  competition for
employees  with the skills  required  to  perform  the  services  offered by the
Company.  There can be no  assurance  that the  Company  will be  successful  in
attracting a sufficient  number of highly  skilled  employees in the future,  or
that it will be successful in training,  retaining and motivating employees. The
Company's  inability  to  attract,  train and retain  skilled  employees  or the
Company's  employees'  inability to achieve expected levels of performance could
impair the  Company's  ability to  adequately  manage and  complete its existing
projects  and to bid for or obtain  new  projects,  which  could have an adverse
effect on the Company's business, financial condition and results of operations.

                                                         9

<PAGE>

Fixed-Price Contracts and Other Project Risks

         A  significant  portion of the  Company's  revenue was  generated  on a
fixed-price,  fixed-delivery-schedule  ("fixed-price")  basis,  rather than on a
time and  materials  basis.  The Company's  failure to  accurately  estimate the
resources  required  for a  fixed-price  project or its failure to complete  its
contractual  obligations in a manner consistent with the project plan upon which
its fixed-price  contract was based could adversely affect the Company's results
of operations and could have a material adverse effect on the Company's business
and financial  condition.  In the past,  the Company has been required to commit
unanticipated   additional   resources  to  complete  certain  projects,   which
negatively affected the profitability  generated on such projects, and has found
it necessary to revise  project plans during the project,  and to change project
managers  to  ensure  projects  are  completed  on  schedule.  The  Company  may
experience  similar  situations in the future.  Failure to anticipate such needs
could  have a  material  adverse  effect on the  Company's  business,  financial
condition and results of  operations.  In addition,  the Company may establish a
price before the design  specifications  are finalized,  which could result in a
fixed  price that turns out to be too low and  therefore  adversely  affects the
Company's business,  financial condition and results of operations.  The Company
has  undertaken  and may in the future  undertake  projects in which the Company
guarantees performance based upon defined operating specifications or guaranteed
delivery  dates.  Unsatisfactory  performance or  unanticipated  difficulties in
completing such projects may result in client dissatisfaction and a reduction in
payment  to, or payment of damages  by, the  Company,  any of which could have a
material  adverse  effect on the  Company's  business,  financial  condition and
results of  operations.  Certain  contracts  involving  government  agencies are
priced at cost or agreed upon labor rates plus overhead.  The Company's overhead
rates are subject to audit and could result in price reductions  associated with
disallowed overhead costs of methods used to derive overhead rates.

Competition

         The  environmental  engineering and information  technology  consulting
industries in which the Company operates are subject to intense competition.  In
addition to the thousands of small  environmental  consulting  and testing firms
operating   nationally,   ATC  competes  with  several  national   environmental
engineering  and consulting  firms  including Law  Engineering,  Inc., The Earth
Technology  Corporation  (a subsidiary  of Tyco  International,  Inc.),  Dames &
Moore,  Inc.  and  Professional  Service  Industries,  Inc.  In the  information
technology  consulting  market,  ATC competes  with many small and  medium-sized
information  technology  firms as well as large  temporary  staffing  companies,
including The Olsten  Corporation,  Corestaff,  Inc. and Accustaff  Incorporated
among others and large systems consulting firms.

         Many  of  ATC's  present  and  future   competitors  may  have  greater
financial,  technical  and personnel  resources  than ATC. It is not possible to
predict the extent of competition  that ATC will encounter in the near future as
the environmental  engineering and information  technology  consulting  services
industries  continue to mature and  consolidate.  Historically,  competition has
been based primarily on the quality, timeliness and costs of

                                                        10

<PAGE>
services.  The  ability  of ATC to compete  successfully  will  depend  upon its
marketing efforts,  its ability to accurately estimate costs, the quality of the
work it  performs,  its ability to hire and train  qualified  personnel  and the
availability of insurance.

Variability of Quarterly Operating Results; Seasonality

     The Company's  revenue and operating  results may fluctuate from quarter to
quarter based on a number of factors,  including  the number,  size and scope of
projects in which the Company is engaged,  the  contractual  terms and degree of
completion of such projects,  any delays  incurred in connection with a project,
employee  hiring and utilization  rates,  the adequacy of provisions for losses,
the accuracy of estimates of resources required to complete ongoing projects and
general economic conditions.  In addition, the timing of revenue is difficult to
forecast because the Company's sales cycle is relatively long. A high percentage
of the  Company's  operating  expenses,  particularly  personnel  and rent,  are
relatively fixed in advance of any particular  quarter.  For example,  while the
number of  professional  staff the Company  employees may be adjusted to reflect
active  projects,  such  adjustments  take time and the Company must  maintain a
sufficient  number of senior  professionals  to oversee  existing clients and to
focus on securing new client engagements. As a result,  unanticipated variations
in the number of or progress toward  completion of the Company's  projects or in
employee utilization rates may cause significant variations in operating results
in any particular  quarter and could result in adverse  changes to the Company's
business,  financial condition and results of operations.  Seasonal factors such
as  weather-related  shutdowns in major markets,  vacation days,  total business
days in a  quarter,  or the  business  practices  of clients  such as  deferring
commitments  on new projects until after the end of the calendar or the client's
fiscal year could require the Company to maintain  under-utilized  employees and
could  therefore  have a  material  adverse  effect on the  Company's  business,
financial  condition  and results of  operations.  Any  shortfall  in revenue or
earnings  from  expected  levels  or  other  failure  to  meet  expectations  of
securities  analysts or the market in general  regarding  results of  operations
could have an immediate and  significant  adverse  effect on the market price of
the Company's  Common Stock.  Given the  possibility of such  fluctuations,  the
Company  believes that  comparisons  of its results of operations  for preceding
quarters are not  necessarily  meaningful  and that such results for one quarter
should not be relied upon as an indication of future performance.

                                 USE OF PROCEEDS

         The net proceeds to the Company from the exercise of all 568,207  Class
C Warrants, of which no assurances can be given in this regard, are estimated to
be approximately  $5,650,000 after deducting estimated offering expenses payable
by the Company of approximately $32,000.

         The Company may utilize all or any portion of the net  proceeds of this
offering for general  working  capital  purposes  and/or to expand the Company's
operations  through  strategic  acquisitions  of  companies  with  complementary
services, products or technologies, as well as through internal expansion.

                                                        11

<PAGE>



         The  Company  is  actively  exploring  acquisition  opportunities,  has
identified a number of companies  which it might wish to acquire and has engaged
in certain  preliminary  due diligence  activities.  These  activities  have not
resulted in any contract,  understanding or arrangement for an acquisition as of
the date of this  Prospectus.  Because all of the net proceeds will be available
for acquisitions,  internal expansion and general working capital purposes,  the
Company's  Board of  Directors  will have broad  discretion  with respect to the
application  of such  proceeds.  The  Company  may  not be  able  to  consummate
acquisitions   or  identify  and  obtain   projects   that  meet  the  Company's
requirements.

         Pending the application of such proceeds, the Company intends to invest
the net proceeds of this  offering in bank deposits and  short-term,  investment
grade securities, including government obligations and money market instruments.


                               RECENT DEVELOPMENTS

Senior  Debt  Offering & Bank  Credit  Agreement  - On May 29,  1997 the Company
issued  $32,500,000  of  8.18%  Senior  Secured  Notes  in a  private  placement
offering.  The notes are payable in five  installments  beginning  May 31, 2000;
interest is payable semi-annually  commencing November 30, 1997. The Company has
the right to prepay the loans at a premium over the  outstanding  principal.  In
connection with the note offering,  the Company executed a credit agreement with
the Chase  Manhattan  Bank and Atlantic Bank of New York.  The credit  agreement
provides for a  $15,000,000  revolving  line of credit  maturing on November 30,
1999. A portion of the proceeds of the Senior  Secured  Notes were used to repay
the outstanding borrowings of $21,350,000 as of May 29, 1997 under the Company's
bridge  credit  facility.  The bridge  facility was entered into in May, 1996 to
provide capital in connection with the Company's acquisition of American Testing
and Engineering Corporation and 3D Information Services, Inc.

Acquisitions

Fiscal 1997
- -----------

     American  Testing  and  Engineering  Corporation  - On May  24,  1996,  ATC
purchased certain assets and assumed certain liabilities of American Testing and
Engineering Corporation ("ATEC"), a national environmental consulting firm. ATEC
provides  environmental  consulting  and  engineering  services  including  risk
assessments,    compliance   audits,   environmental   remediation   consulting,
geotechnical,  materials  testing,  industrial  hygiene and analytical  services
through a large  network  of branch  and  regional  offices.  For its year ended
December 31, 1995,  ATEC  (excluding  WATEC,  a non-  acquired  subsidiary)  had
revenues of $85,020,000 and a net loss of ($1,820,000).  However, as a result of
economies and savings  realized,  the acquisition  was immediately  accretive to
earnings as well as benefiting  the Company's  operations by expanding  both its
service offerings and geographic base.


                                                        12

<PAGE>



         The assets acquired included  intangible and tangible assets consisting
of accounts receivable, work in process and customer and certain other deposits.
Additionally,  ATC  executed  an  agreement  to lease  substantially  all of the
sellers  equipment and executed several sublease  agreements for premises leased
by ATEC. ATC also obtained non-competition  agreements with ATEC, a non-acquired
subsidiary, and the majority shareholder of ATEC.

         3D Information  Services,  Inc. - Effective May 28, 1996, ATC purchased
certain  assets and assumed  certain  specified  liabilities  of 3D  Information
Services, Inc. ("3D"), a New Jersey based information services company providing
technical  information  system consulting  services in all phases of information
system  design,  development,  maintenance  and  management in client server and
mainframe  based  environments.  3D provides  analysis  and design  services and
system programming services to help clients in building new computer systems and
modifying  existing  computer  systems.  3D also provides  support to clients in
maintaining computer systems and in areas such as help desk management and other
system support services.  Employees of 3D typically work full-time at a client's
work site.  Its  clients  include  major  companies  in the  telecommunications,
financial services and pharmaceutical  industries.  3D reported revenues and net
income of  approximately  $10,360,000 and $135,000,  respectively,  for its year
ended December 31, 1995.

Continuing Litigation

     With ATC's  significant  growth,  the Company is now exposed to  additional
involvement  in  litigation  of a  routine  nature  arising  from the  Company's
performance of services and its contractual and business  relationships  entered
into in the ordinary course of business. Except for the risk associated with the
First Fidelity Bank v. Hill International, Inc., litigation described in greater
detail in the Company's  Form 10-K for its fiscal year ended  February 28, 1997,
and Form 10-Q for its quarter ended May 31, 1997 which are  incorporated  herein
by  reference,  no currently  pending or  threatened  litigation  is expected by
management to have a material  effect on the  Company's  operations or financial
conditions.


                                                        13

<PAGE>



                                                    MANAGEMENT

         The  following  table  sets forth  certain  information  regarding  the
Company's directors, executive officers and a key employee.

Name                               Age      Position

Officers and Directors:

George Rubin                       69       Chairman of the Board and
                                            Secretary; Director

Morry F. Rubin                     37       President, Chief Executive
                                            Officer, Treasurer; Director

Nicholas J. Malino                 47       Senior Vice President,
                                            Financial and General Operations

Chistopher P. Vincze               35       Senior Vice President,
                                            Financial and General Operations

Donald W. Beck                     38       Senior Vice President

John J. (Jeff) Goodwin             48       Vice President of 
                                            Information Services

Richard L. Pruitt                  57       Vice President, Principal
                                            Accounting Officer; Director

Wayne A. Crosby                    44       Chief Financial Officer

Richard S. Greenberg, Esq.         48       Director

Julia S. Heckman                   48       Director


Key Employee:

John J. Smith, Esq.                46        General Counsel


         The business experience,  principal occupations and employment, as well
as the periods of service,  of each of the directors,  executive  officers and a
key  employee of the  Company  during at least the last five years are set forth
below.


                                                        14

<PAGE>

         George  Rubin has been  Chairman of the Board of ATC since  1988.  From
1961 to 1987,  Mr. Rubin served as President,  Treasurer and a director of Staff
Builders,  Inc. Staff Builders Inc., was a publicly held corporation  engaged in
the business of providing temporary personnel primarily in the health care field
operating through approximately 100 offices and with revenues over $100 million.
Since  December  1986,  Mr.  Rubin has been a principal  stockholder,  executive
officer and a director of National Diversified  Services,  Inc., a publicly held
corporation which completed a public offering in December 1986 and currently has
no business operations. George Rubin is the father of Morry F. Rubin.

         Morry F. Rubin has been President,  Chief Executive Officer,  Treasurer
and a director of ATC since 1988. Mr. Rubin was also President,  Chief Executive
Officer and  Treasurer of Aurora from May 1985 to June 1995,  and was a director
of Aurora from  September  1983 to June 1995.  Since 1986,  Mr. Rubin has been a
principal  stockholder and from 1986 to July 1995, Mr. Rubin was President and a
director of National  Diversified  Services,  Inc., a publicly held corporation,
which completed a public offering in December 1986 and currently has no business
operations. From 1981 to 1987, Mr. Rubin was employed in sales and as a director
of  acquisitions  for Staff  Builders,  Inc., a publicly held company engaged in
providing temporary personnel primarily in the health care field.
Morry F. Rubin is the son of George Rubin.

         Nicholas  J.  Malino has been  Senior  Vice  President,  Financial  and
General  Operations of ATC, since July 1993 and an employee of ATC since October
1992. Mr. Malino has over fourteen years of experience in managing  professional
service organizations.  From February 1991 to September 1992, Mr. Malino was the
New York Regional Manager for Kemron Inc., a hazardous waste consulting  company
headquartered in McLean,  Virginia. From August 1989 to January 1991, he was the
Operations  Manager  for  the New  York  City  branch  of  Professional  Service
Industries, Inc.

         Christopher  P. Vincze has been Senior Vice  President,  Financial  and
General  Operations of ATC since July 1993, a regional manager of ATC since July
1991 and Vice  President of a subsidiary  of ATC since 1992.  Mr.  Vincze joined
Dennison  Environmental,  Inc. in 1984 as an industrial  hygienist and served as
Vice President of Marketing and Operations from 1987 to July 1991.

     Donald W. Beck has been Senior Vice  President  of ATC since April 1990 and
Vice  President  since January 1988.  Mr. Beck is  responsible  for managing the
operations  of certain  ATC  offices.  Mr. Beck also served as a director of ATC
Laboratories,  Inc., a  predecessor  company of ATC,  from  November  1985 until
January 1988,  President of ATC  Laboratories,  Inc. from May 1986 until January
1988 and as Vice  President of ATC  Laboratories,  Inc. from November 1985 until
May 1986.  Mr.  Beck has been a  full-time  employee  of ATC (and  formerly  ATC
Laboratories, Inc.) since May 1982.

         John J. (Jeff)  Goodwin has been  President and a director of ATC InSys
Technology  Inc. since it was formed in May 1996.  From September 1994 until May
1996, Mr. Goodwin  served as President of the Contest  Systems  Division of ATC,
providing clients with specialized systems for managing  environmental  hazards.
Prior to joining  ATC,  Mr.  Goodwin  directed a  national  information  systems
consulting practice for Datronics

                                                        15

<PAGE>
Management  Inc.  from  December  1991 until August 1994.  From April 1980 until
October 1991,  Mr.  Goodwin was employed by Ernst & Young LLP, an  international
professional  services firm, where he was admitted as a Partner in 1984. In this
capacity,  Mr.  Goodwin  directed  a public  sector and  environmental  services
consulting  practice  and  a  decision  support  systems  practice,  and  was  a
client-service  partner  in  Ernst  &  Young's  general  Information  Technology
consulting practice.

         Richard L. Pruitt is a Vice President, the Principal Accounting Officer
and a director  of ATC.  Mr.  Pruitt has served as Vice  President  of ATC since
September 1990, as Principal Accounting Officer of ATC since April 1988 and as a
director of ATC since  January 1988.  Mr.  Pruitt served as Principal  Financial
Officer of ATC from September 1989 to April 1992 and from May 1993 to July 1995.
Mr. Pruitt served as the  Principal  Financial  Officer and a director of Aurora
from May 1985 to June  1995 and  served as  Financial  Manager  of  Aurora  from
February 1982.

     Wayne A.  Crosby has been Chief  Financial  Officer of ATC since July 1995.
Prior to joining  ATC in December of 1993,  Mr.  Crosby was the Chief  Financial
Officer of BSE Management, Inc. from 1991 to 1993 and Chief Financial Officer of
Compex  Systems,  Inc. from 1986 through 1990. Mr. Crosby is a certified  public
accountant and was employed by Deloitte & Touche LLP (formerly  Deloitte Haskins
& Sells) for eight years.

     Richard S. Greenberg,  Esq. has been a director of ATC since July 1995. Mr.
Greenberg  has  been a  director  of  the  Environmental  Management  Consulting
Services Group at Coopers & Lybrand since October 1989.  Mr.  Greenberg has over
20 years of  experience  in the areas of  environmental  management  consulting,
environmental litigation support and legislative policy analysis.

     Julia S. Heckman has been a director of ATC since August 1995. Mrs. Heckman
has been a Managing director with Rodman & Renshaw,  Inc.'s  Investment  Banking
Group since April 1995 and had been a Managing  Director  with Mabon  Securities
Corp.'s  Investment  Banking Group since 1991. Prior to joining Mabon Securities
Corp.,  Mrs.  Heckman was a Managing  Director  with Paine  Webber  Group Inc.'s
Corporate Finance  Department.  Mrs. Heckman serves as a member of the Company's
Board of Directors  pursuant to the  Underwriting  Agreement  dated  October 10,
1995, between Rodman & Renshaw, Inc. and the Company.

         John J. Smith,  Esq.  has been  General  Counsel  since August 1989 and
served as a Vice  President of ATC from  September  1990 through  December 1993.
Prior to joining  ATC,  from 1986 to 1989,  Mr.  Smith was the  Secretary of the
South Dakota Department of Water and Natural Resources, a cabinet level position
responsible for managing all of the State's  environmental and natural resources
development programs.

     The Board of Directors has an Audit Committee and a Compensation  Committee
consisting  of three  directors  including  Morry F.  Rubin and the  independent
directors,  Richard S.  Greenberg and Julia S. Heckman.  The Audit  Committee is
responsible,  among other things, for approving transactions between the Company
and any of its directors,

                                                        16
<PAGE>



officers or affiliates.  The  Compensation  Committee is responsible for setting
compensation  of the  executive  officers of the Company  and for  granting  any
further options to purchase Common Stock.

         All   directors  of  ATC  will  hold  offices  until  the  next  annual
stockholders'  meeting  and  until  the  election  and  qualification  of  their
successors.  Officers hold their respective positions until their successors are
duly qualified or until they resign or are removed by the Board of Directors.


                              PLAN OF DISTRIBUTION

         Security  holders who desire to exercise their Warrants  should execute
the  Subscription  Form  contained in the security and submit same together with
any appropriate  check made payable to "ATC Group Services Inc." to the transfer
agent,  American Stock Transfer & Trust Co., 40 Wall Street,  New York, New York
10005.  ATC does not  intend  to pay  broker-dealers  solicitation  fees for the
exercise of its Warrants.


                          DESCRIPTION OF CAPITAL STOCK

Common Stock

         The  authorized  capital stock of ATC consists of 20,000,000  shares of
Common Stock,  $.01 par value each.  The shares of Common Stock:  (i) have equal
ratable rights to dividends from funds legally available therefore, when, as and
if declared by the Board of Directors of ATC; (ii) are entitled to share ratably
in all of the  assets of ATC  available  for  distribution  to holders of Common
Stock upon  liquidation,  dissolution or winding up of the affairs of ATC; (iii)
do not have  pre-emptive,  subscription  or  conversion  rights and there are no
redemption or sinking fund provisions  applicable thereto; and (iv) are entitled
to one non-cumulative  vote per share on all matters upon which Stockholders may
vote at all meetings of Stockholders. All shares of Common Stock now outstanding
are fully paid and  non-assessable  and all shares of Common Stock which are the
subject of this offering, when issued, will be fully paid and non-assessable.

Class C Warrants

         Each  Class C Warrant  entitles  the  holder to  purchase  one share of
Common Stock at an exercise  price of $10.00 per share until April 30, 1998. ATC
has the right to redeem  the  Class C  Warrants  at a price of $.001 per Class C
Warrant upon 30 days prior written  notice.  The holders of the Class C Warrants
do not have any of the rights or privileges of  stockholders of ATC prior to the
exercise of warrants.  The exercise price of the Class C Warrants and the number
of  shares  issuable  upon  exercise  of the Class C  Warrants  are  subject  to
anti-dilution  adjustment  to protect  against  stock  dividends,  stock splits,
mergers  and  recapitalizations.  In  accordance  with the  terms of the Class C
Warrants, ATC is

                                                        17

<PAGE>



required to  maintain a current and  effective  registration  of the  securities
issuable upon exercise of the Class C Warrants.

         Although the foregoing brief  description of the Warrants  contains the
information ATC deems necessary to make an informed decision, it is qualified in
its  entirety by  reference  to the terms of the Warrant  Agreement  and Warrant
Certificates, the forms of which have been filed as exhibits to the Registration
Statement of which this Prospectus is a part.

         ATC must have a current and  effective  registration  statement on file
with the Securities and Exchange  Commission in order for a Warrant holder to be
able to exercise the Warrants. In accordance with the terms of the Warrants, ATC
will be required to file for, and endeavor to secure, such current and effective
registration of the securities  issuable upon exercise of the Warrants.  Various
state  securities laws relating to  qualification of securities (or an exemption
thereof) for sale in such states may also be applicable.  Necessarily  there can
be no assurance that ATC will, at all times during the life of the Warrants,  be
able to secure or maintain such registration or qualification;  and in the event
it is  unable  to do so,  the  Warrants  will  not  be  exercisable  and  may be
valueless.  If ATC is unable to qualify the  securities  underlying the Warrants
for sale in  particular  states,  Warrant  holders in those  states will have no
choice but to sell their Warrants or let them expire.

Delaware Law

         Section  203  of the  Delaware  General  Corporation  Law  prohibits  a
publicly-held  Delaware corporation from engaging in "business combination" with
an  "interested  stockholder"  for a period of three years after the date of the
transaction  in which the person  became an interested  stockholder,  unless the
business   combination  is  approved  in  a  prescribed   manner.   A  "business
combination" includes mergers, asset sales and other transactions resulting in a
financial  benefit to the stockholder.  An "interested  stockholder" is a person
who,  together with affiliates and associates,  owns (or within three years, did
own) 15% or more of the corporation's voting stock.

Indemnification

         As permitted by the Delaware General Corporation Law, ATC's Certificate
of Incorporation  provides that a director of ATC will not be personally  liable
to ATC or its Stockholders for monetary damages for breach of the fiduciary duty
of care as a director,  except under certain  circumstances  including breach of
the director's  duty of loyalty to ATC or its  Stockholders  or any  transaction
from which the director derived an improper personal benefit.

         ATC's by-laws  provide for the  indemnification  of ATC's  officers and
directors to the fullest extent permitted by Delaware law. In this respect,  ATC
entered into indemnification  agreements with its officers and directors to hold
them harmless and to indemnify  each person from and against all fines,  amounts
paid in settlements and expenses, including

                                                        18

<PAGE>



attorneys'  fees incurred as a result of or in connection  with any  threatened,
pending or completed  action,  suit or proceeding,  whether  civil,  criminal or
administrative  or  investigative,  by reason of the fact that the  person was a
director  and/or officer of ATC or served any other  corporation in any capacity
at the request of ATC, in the manner and to the extent permitted by law.

         ATC has been  advised  that it is the  position of the  Securities  and
Exchange  Commission that insofar as the foregoing  provisions may be invoked to
disclaim  liability for damages  arising under the  Securities  Laws,  that such
provisions are against public policy as expressed in the Securities Laws and are
therefore unenforceable.

Transfer Agent and Exchange Agent

         American Stock Transfer & Trust Co., New York, NY is acting as transfer
agent and warrant  agent for ATC's  securities.  Security  holders who desire to
exercise their Warrants  should execute the  Subscription  Form contained in the
security and submit same  together  with any  appropriate  check made payable to
"ATC Group  Services,  Inc." to the transfer  agent,  American  Stock Transfer &
Trust Co., 40 Wall Street,  New York, New York 10005. ATC does not intend to pay
broker-dealers solicitation fees for the exercise of its Warrants.
See "Plan of Distribution."

                                  LEGAL MATTERS

         The validity of the  issuance of the shares of Common Stock  offered by
this Prospectus will be passed upon for the Company by Lester Morse, P.C., Great
Neck,  New York.  Prior to this  offering,  Lester Morse P.C. and members of the
firm own of record and beneficially less than 2% of ATC's outstanding  shares of
Common Stock.

                                     EXPERTS

     The financial statements of ATC Group Services Inc. as of February 28, 1997
and  February  29,  1996 and for each of the  three  years in the  period  ended
February 28, 1997, which have been incorporated by reference,  from ATC's Annual
Report on Form 10-K, as amended,  have been audited by Deloitte & Touche L.L.P.,
independent  auditors, as stated in their report which is incorporated herein by
reference, and has been so incorporated in reliance upon the report of such firm
given upon their authority as experts in accounting and auditing.

     The financial statements of American Testing and Engineering Corporation as
of December  31, 1995 and 1994,  and for the years ended  December  31, 1995 and
1994, the three months ended December 31, 1993 and the year ended  September 30,
1993,  which are included in ATC's Group  Services  Inc.'s Form 8-K/A#2 (date of
earliest  event reported - May 24, 1996) which has been  incorporated  herein by
reference, have been audited by Deloitte Touche L.L.P., independent auditors, as
stated in their report which is included herein, and has been so incorporated in
reliance  upon the report of such firm given upon their  authority as experts in
accounting and auditing.

                                                        19

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