SAFETY KLEEN CORP/
10-K, 1999-10-29
HAZARDOUS WASTE MANAGEMENT
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                                  UNITED STATES

                       SECURITIES AND EXCHANGE COMMISSION

                             Washington, D.C. 20549

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

                                    FORM 10-K

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

                     ANNUAL REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE

                         SECURITIES EXCHANGE ACT OF 1934

                    For the Fiscal Year Ended August 31, 1999

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

                          Commission File Number 1-8368

                               SAFETY-KLEEN CORP.
             (Exact name of registrant as specified in its charter)

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

                          Delaware                     51-0228924
               (State or other jurisdiction of       (I.R.S. Employer
                incorporation or organization)        Identification No.)

               1301 Gervais Street, Columbia, South Carolina 29201
               (Address of principal executive offices) (Zip Code)

       Registrant's telephone number, including area code: (803) 933-4200

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

           Securities Registered pursuant to Section 12(b) of the Act:

       Title of each class         Name of each exchange on which registered
           Common Stock                    New York Stock Exchange
          Par Value $1.00                  Pacific Exchange, Inc.

        Securities registered pursuant to Section 12(g) of the Act: None

Indicate by check mark whether the registrant (1) has filed all reports required
to be filed by  Sections  13 or 15(d)  of the  Securities  Exchange  Act of 1934
during the preceding 12 months (or for such shorter  period that the  registrant
was  required  to file such  reports),  and (2) has been  subject to such filing
requirements for the past 90 days. Yes X No ___

Indicate by check mark if disclosure of delinquent  filers  pursuant to Item 405
of Regulation  S-K is not contained  herein,  and will not be contained,  to the
best of registrant's  knowledge,  in definitive proxy or information  statements
incorporated by reference in Part III of this Form 10-K or any amendment to this
Form 10-K. [ X ]

The  aggregate  market value of the common stock held by  non-affiliates  of the
registrant was $671,032,318 as of October 15, 1999.

The number of shares of the issuer's common stock  outstanding as of October 15,
1999 was 100,637,975.

                       DOCUMENTS INCORPORATED BY REFERENCE

Portions of the 1999 Annual Report to Stockholders  are  incorporated in Part II
of Form 10-K.

Portions of the Proxy  Statement for the Annual  Meeting of  Stockholders  to be
held November 30, 1999 are incorporated in Part III of Form 10-K.

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

<PAGE>



<TABLE>
<CAPTION>
                                TABLE OF CONTENTS


Item                                                                                              Page
                                     PART I
<S>   <C>                                                                                         <C>
1.    Business.....................................................................................1
2.    Properties..................................................................................12
3.    Legal Proceedings...........................................................................13
4.    Submission of Maters to a Vote of Security Holders..........................................17


                                     PART II

5.    Market for the Registrant's Common Equity and Related Stockholder Matters...................17
6.    Selected Financial Data.....................................................................17
7.    Management's Discussion and Analysis of Financial Condition and Results of Operations.......18
7A.   Quantitative and Qualitative Disclosures About Market Risk..................................26
8.    Financial Statements and Supplementary Data.................................................27
9.    Changes in and Disagreements with Accountants on Accounting and Financial Disclosure........60


                                    PART III

10.   Directors and Executive Officers of the Registrant..........................................60
11.   Executive Compensation......................................................................60
12.   Security Ownership of Certain Beneficial Owners and Management..............................60
13.   Certain Relationships and Related Transactions..............................................60


                                     PART IV

14.   Exhibits, Financial Statement Schedules and Reports on Form 8-K.............................60
      Signatures..................................................................................65
</TABLE>
                                       -i-
<PAGE>


66

                                     PART I
                                     ------
ITEM 1.   BUSINESS

                                     GENERAL

        Safety-Kleen  Corp. (the "Company",  the "Registrant" or "Safety-Kleen")
provides  industrial waste services  designed to collect,  process,  recycle and
dispose of hazardous and industrial  waste streams.  The Company  provides these
services from approximately 280 collection and processing locations in 45 states
and seven Canadian provinces.

        The  Registrant  was  incorporated  in Delaware in 1968.  Its  principal
executive office is located at 1301 Gervais Street,  Suite 300, Columbia,  South
Carolina 29201 and its telephone number is 803-933-4200.

        On December 23, 1998, the Company announced the  recapitalization of its
European  operations  resulting  in the  sale  of 56%  of the  Company's  equity
interest in those operations.  Effective December 1, 1998, the Company ceased to
consolidate the results of the European operations and began to account for them
under the equity method.

        The Company, in providing  industrial waste services,  is engaged in two
primary lines of business:  (a) Collection  and Recovery,  and (b) Treatment and
Disposal.  The  Collection  and  Recovery  Component  is further  defined by the
markets for which it provides services:

Industrial Services and Commercial and Institutional Services.

        The  Collection  and  Recovery   component  involves  providing  various
services to both  industrial and commercial  customers.  These services  include
parts cleaners and hazardous and non-hazardous  waste collection.  The Treatment
and Disposal  component  involves the  treatment,  recycling and  destruction of
hazardous and non-hazardous waste at Company owned and operated facilities.  The
Company  operates  thermal  destruction  incinerators,  landfills and wastewater
treatment  facilities.  The Company's revenue and income are derived principally
from  customers in the United  States,  which  include a variety of  commercial,
industrial,  governmental and residential  customers.  Substantially all revenue
represents income from unaffiliated customers.

        The  percentages  of the Company's  revenue  contributed  by its primary
business  components  (including  the  European  operations)  for the last three
fiscal years ended August 31, were as follows:

                                                         1999     1998     1997
                                                         ----     ----     ----
Collection and Recovery Component

  Industrial Services ...............................      47%      50%      58%
  Commercial and Institutional Services .............      32%      19%       0%
                                                           ---      ---      ---
Total Collection and Recovery .......................      79%      69%      58%

Total Treatment and Disposal ........................      19%      27%      42%

European Operations .................................       2%       4%       0%
                                                           ---      ---      ---


        Total Revenue                                      100%    100%     100%
                                                           ====    ====     ====

        As of August 31, 1999, Laidlaw Inc. ("Laidlaw") beneficially owned 43.6%
of the  Company's  outstanding  Common  Stock.  Laidlaw  announced  publicly  on
September 13, 1999 its intention to divest itself of all its Common Stock within
six to twelve months.  On September 13, 1999,  the Company's  Board of Directors
appointed a Special  Committee made up of independent  non-Laidlaw  directors to
consider the  implications of the announced change in Laidlaw's time horizon for
divesting its 43.6% common share ownership of the Company.  On October 12, 1999,
the  Company  announced  that it  received a detailed  report  from the  Special
Committee and its financial  advisor,  Raymond James & Associates,  on strategic
and  financial  alternatives  for the  Company.  The  Special  Committee  made a
recommendation  to the  Board  that it begin  discussions  with  likely  sale or
strategic  merger  candidates.  After due  consideration,  the  Company's  Board
unanimously agreed with the  recommendation of the Special Committee.  The Board
also approved the  reinstitution of the Company's  stockholders'  rights plan to
help insure that all stockholders will be given an opportunity to participate in
any sale or merger which may take place.

                                       -1-
<PAGE>

                        COLLECTION AND RECOVERY SERVICES

        Safety-Kleen  provides Collection and Recovery Services in North America
primarily  through a network of 176 branches  supported by 31 service center and
accumulation  center  locations.  Collection  and Recovery  Services are further
differentiated  by those  services  provided to  industrial  customers and those
provided to commercial and institutional customers.

Industrial Services

        The Company  markets two major  categories of service to its  Industrial
Services customers: its Parts Cleaner Service and its Industrial Waste Services.
In Safety-Kleen's  Parts Cleaner Service,  the Company's service  representative
places  parts  cleaner  equipment  and  solvent  with a  customer.  The  service
representative  then  makes  service  calls at  regular  intervals  to clean and
maintain the equipment and to remove the dirty solvent and replace it with clean
solvent.  The majority of the dirty  solvent is recycled for reuse.  The Company
provides a choice of several models of parts cleaners to customers for their use
as part of the Parts Cleaner Service and also provides  service to customers who
own  their own parts  cleaner  equipment.  As an  alternative  to  solvent-based
systems, Safety-Kleen also offers a line of water-based cleaning systems through
its Parts Cleaner Service.

        The  Company's  Industrial  Waste  Services  consist  primarily  of  the
collection  of  a  wide  variety  of  liquid  and  solid  wastes,  hazardous  or
non-hazardous,   typically  in  drum  containers  from  a  customer's  location.
Depending  upon the type of customer,  the Company may make frequent  pickups of
large quantities or may pick up only one or a few 55-gallon drums on a scheduled
periodic  basis.  Depending  upon the  content,  the  material  collected by the
Company may be recycled into usable solvent, processed into a waste-derived fuel
for  use  in  the  cement  manufacturing   industry,   or  disposed  of  through
incineration or landfill methods.

        The Industrial  Waste  Services group also provides other  comprehensive
environmental and technical service. Technical Field Services includes offerings
such as Lab Pack Services and In-Plant  Services.  The primary focus of Lab Pack
Services is the collection  and proper  management of  miscellaneous,  and often
unidentified,  chemicals stored in small containers.  Since the list of Lab Pack
chemicals  removed  from a particular  site can be extensive  and vary widely in
characteristics  and  quantities,  the  knowledge and abilities of Company field
chemists are often required.  In-Plant Services  encompass a variety of services
provided  by  Safety-Kleen  personnel  at  the  generator's  location.  In-Plant
Services are  customized to the specific  needs of the customer.  With Technical
Field Services,  Safety-Kleen  often prepares the paperwork,  packages the waste
for shipment and provides for transportation and disposal management.

        Waste streams collected through one or more of Safety-Kleen's Industrial
Services  offerings  may be routed to one of the  Company's  service  centers or
accumulation  centers where they are  temporarily  stored or  consolidated  with
compatible waste streams for more efficient  transportation  to final recycling,
treatment or disposal destinations.  All of the Company's service centers in the
United States have Part B permits under the United States Resource  Conservation
and Recovery Act ("RCRA") that,  among other things,  allow the Company to store
waste for up to one year for bulking or transfer  purposes.  Service centers and
accumulation  centers are the largest  source of waste streams for the Company's
treatment and disposal facilities.  In 1999, the Company directed  approximately
80% of its waste streams to internal disposal locations.

Commercial and Institutional Services

        The Company  provides  several  specialized  services to commercial  and
institutional  customers.  The largest component of the Company's Commercial and
Institutional  Services is its Parts  Cleaner  Service.  Safety-Kleen  furnishes
service  stations,  car and truck  dealers,  small engine  repair  shops,  fleet
maintenance shops and other automotive and retail repair customers with the same
high quality Parts Cleaner  Service that it provides to its Industrial  Services
customers.

        Other  Commercial  and  Institutional  Service  offerings  include Paint
Refinishing  Services,  Imaging  Services,  Dry Cleaner  Services,  Vacuum Truck
Services,  Integrated  Customer  Compliance Services and Used Oil Collection


                                       2
<PAGE>

and Re-Refining  Services.  These additional offerings utilize the same facility
network and many of the same customer  relationships  as have been developed for
the traditional Parts Cleaner Service.

        The Company's  Paint  Refinishing  Services are supplied to new and used
car  dealers,   auto  body  repair  and  paint  shops  and  fiberglass   product
manufacturers.  Company  representatives  place a machine and solvent  with each
customer, maintain the machine and regularly remove the contaminated solvent and
replace it with clean  solvent.  The Company  either  recycles the  contaminated
solvent into clean solvent for reuse or blends it into fuel used by cement kilns
or  incinerators.  Waste paint and paint booth filters are also  collected  from
these customers and blended into fuel for cement kilns or incinerators.  Company
representatives  also  provide  clean  buffing  pads and remove used pads during
regularly  scheduled service calls. The used pads are washed,  dried,  inspected
and returned to the Company's distribution system.

        The Company's  Imaging  Service  provides health care,  printing,  photo
processing  and other  businesses  and  industries  with  on-site  recycling  of
photochemical  solutions,  as well as film, plate and silver recovery  services.
Imaging  Services  recovers  the  silver  contained  in the spent  photochemical
solutions it collects from  customers.  These solutions are then further treated
and processed  until they can be discharged  as wastewater  into publicly  owned
treatment works in compliance with  applicable laws and  regulations.  Silver is
also recovered from photographic film by outside processors.

        Dry  Cleaner  Services  collect and recycle  contaminated  dry  cleaning
wastes   consisting   of  used   filter   cartridges   and   sludge   containing
perchloroethylene and mineral spirits.

        Vacuum Services  utilizes  specialized  vacuum trucks to remove residual
oil and sludge from  underground  oil/water  separators found at many automotive
repair and as well as other residual fluids found at small industrial locations.
Collected oil is recycled or reused as a fuel source.

        The Company  provides  Integrated  Customer  Compliance  Services to its
customers.  Service  offerings in this area include  Material Safety Data Sheets
("MSDS") Fax on Demand,  an electronic  MSDS management  program;  Department of
Transportation  Shipping Paper  Services,  which provides  appropriate  shipping
papers for hazardous  waste  shipments;  regulatory  training;  spill and poison
control  hotlines;   and  on-site  facility  assessments.   Integrated  Customer
Compliance   offers  single  services  and  bundled  full  service  programs  in
accordance with customer requests.

        Safety-Kleen also provides Used Oil Collection and Re-Refining Services.
The Company  collects used  lubricating  oils from automobile and truck dealers,
automotive garages, oil change outlets, service stations,  industrial plants and
other businesses.  The used oil is then transferred to a re-refining plant where
most of the product is converted into  high-quality  base  lubricating  oil. The
Company  derives  revenue both from fees it charges  customers to haul away used
oil,  oily  water  and  glycol  and from the sale of  products  it  produces  by
processing the used oil. The Company's  extensive  branch network  enables it to
collect waste oil in sufficient  volume to support oil  re-refining  operations,
which produce  lubricating oil that can be sold at  significantly  higher prices
than industrial  fuels. The Company operates oil re-refining  plants in Breslau,
Ontario and East Chicago,  Indiana.  The plants in Breslau and East Chicago have
combined annual  re-refining  capacities of approximately 130 million gallons of
used oil per year. Used oil collected in excess of the capacity of the Company's
re-refining  facilities  is  either  processed  into  industrial  fuels  or sold
unprocessed for direct use as a fuel in certain industrial applications.

                         TREATMENT AND DISPOSAL SERVICES

        Safety-Kleen  provides final Treatment and Disposal Services designed to
properly  manage  hazardous and  non-hazardous  wastes which cannot be otherwise
economically  recycled or reused.  Thermal  Treatment  and  Landfill  facilities
provide  such  solutions  for the  majority of  industrial  waste  streams.  The
Company's Specialty Services provide a compliment of other technologies for more
specialized or economical handling of certain waste streams.


                                       3
<PAGE>

Thermal Treatment

        The  Company  offers a wide  range  of  technological  capabilities  and
locations  to  customers  through its  collection  of  incineration  facilities.
Incineration  is the  preferred  method for the  treatment of organic  hazardous
waste,  because it effectively  destroys the  contaminants  at  temperatures  in
excess of 2,000 degrees fahrenheit.  High temperature  incineration  effectively
eliminates organic wastes such as herbicides,  plastics,  halogenated  solvents,
pesticides,  and pharmaceutical and refinery wastes,  regardless of whether they
are  gases,  liquids,   sludges  or  solids.   Federal  and  state  incineration
regulations  require a  destruction  and removal  efficiency  of 99.99% for most
organic wastes and 99.9999% for PCBs and dioxin.

        The  Company  operates  four  solids  and  liquids-capable  incineration
facilities  with a combined  annual  capacity of over 250,000 tons and two lower
volume specialty  incineration  facilities in the United States,  as well as two
hazardous waste liquid injection incinerators in Canada.

        The Company's  incineration  facilities in Bridgeport,  New Jersey; Deer
Park, Texas; Coffeyville,  Kansas; and Aragonite,  Utah, are designed to process
liquid organic wastes, sludges,  solids, soil and debris. The Deer Park facility
has two kilns and a rotary reactor.  Additionally, the Deer Park facility has an
on-site landfill for the disposal of ash and other waste material  produced as a
result of the incineration  process. The landfill is built and permitted to RCRA
hazardous waste standards.

        The Company's  incineration  facilities  in Mercier,  Quebec and Sarnia,
Ontario  are  liquid  injection   incinerators,   designed   primarily  for  the
destruction of liquid organic waste.  The Mercier  facility also has a system to
blend and destroy  pumpable  sludges.  Typical waste streams include  wastewater
containing  concentrated organic levels not amenable to conventional physical or
chemical  waste  treatment,  pesticide  and  herbicide  waste,  waste  with high
chlorinated organic concentrations and flammable materials.

        All of the Company's United States incineration facilities have received
Part B permits under RCRA.  Part B permits are  generally  issued for periods of
five or ten years,  after  which the permit must be reviewed by state or federal
regulators  or both  before  the permit can be  renewed  for  additional  terms.
Management is not aware of any issues at any of the  Company's  sites that would
preclude the renewal of any of its Part B permits.

        During fiscal 1997,  the Company closed its less efficient and redundant
incineration  facilities  at Baton Rouge,  Louisiana,  and Clive,  Utah.  During
fiscal 1998, the Company  closed its  incinerator  at Roebuck,  South  Carolina,
further  reducing  excess   capacity.   These  three  closures  have  eliminated
approximately  215,000 tons of practical  capacity from the off-site  commercial
incineration  market.  The  industry's  total  off-site  commercial  incinerator
practical  capacity was estimated at 1.0 million tons in 1997,  according to "EI
Digest".

Landfill

        The Company operates 11 landfills  located  throughout the United States
and Canada.  A total of eight  landfills  are  designed  and  permitted  for the
disposal of hazardous  wastes.  Three  landfills are operated for  non-hazardous
industrial waste disposal, and to a lesser extent, municipal solid waste.

        The Company operates eight of the 23 permitted hazardous waste landfills
in North America,  with 60 million cubic yards of remaining  permitted  capacity
(which at current fill rates  represents in excess of 62 years of capacity).  Of
these facilities, six are located in the United States and two in Canada.

        In the United States, the Company's  hazardous waste landfills have been
issued RCRA Subtitle C permits. The EPA's permitting process for RCRA Subtitle C
landfills is very  rigorous.  Before a permit can be issued,  the applicant must
provide detailed waste analysis,  spill  prevention and control  counter-measure
plans,   detailed  design  specifications  (which  include  liner  design,  leak
detection  systems  and  rainwater  removal  systems),  groundwater  monitoring,
employee  training and geologic and hydrogeologic  investigations.  Furthermore,
the applicant must post financial  assurance  instruments  for landfill cell and
site closure and  post-closure  care.  All six of the  Company's  United  States
hazardous  waste  landfills  have received  Part B landfill  permits and meet or
exceed Subtitle C requirements.  These permits are generally  issued for periods
of five or ten  years,  after  which the  permit  must be  reviewed  by state or
federal  regulators  or both  before the permit  can be renewed  for  additional
terms.  Management

                                       4
<PAGE>

is not aware of any issues at any of the Company's sites that would preclude the
renewal of its Part B landfill permits.  During fiscal year 1999,  approximately
1.0 million cubic yards of hazardous wastes were disposed of in these landfills.

        In addition to its hazardous waste landfill sites,  the Company operates
three  non-hazardous  industrial  landfills  with over 6 million  cubic yards of
remaining permitted capacity.  The Company's  non-hazardous  landfill facilities
are  permitted to accept  commercial  industrial  waste,  including  wastes from
foundries, demolition and construction, machine shops, automobile manufacturing,
printing,   metal   fabrications   and  recycling.   During  fiscal  year  1999,
approximately  0.2 million cubic yards of non-hazardous  wastes were disposed of
in these landfills.

Specialty Services

        Specialty  Services  provided  by the  Company  include  PCB  management
services,  wastewater  treatment,  harbor and channel  dredging,  consulting and
analytical services, and transportation services.

        The Company recycles  PCB-contaminated oils and reclaims metals from PCB
contaminated equipment.  The Company accomplishes this recycling and reclamation
through a  de-chlorination  process operated from seven facilities mainly in the
eastern United States and Canada.

        Safety-Kleen   offers  a  range  of  wastewater   treatment   technology
facilities  and customer  services.  Wastewater  treatment is provided from four
facilities  and  consists of four basic  business  lines:  hazardous  wastewater
treatment,  mobile  treatment,  sludge  de-watering or drying and  non-hazardous
wastewater  treatment.  These  services  include the  reduction,  treatment  and
disposal of both hazardous and non-hazardous wastewater,  sludges and solids for
both bulk and drummed  waste.  The Company  removes  hazardous  components  from
hazardous  industrial  liquids and  chemically  or  physically  makes  hazardous
industrial  liquids  non-hazardous  through  blending and treatment  technology.
Specialized  techniques  reduce residues by recycling or reusing spent products.
Batch  treatment  technologies  also enable the Company to handle  hard-to-treat
wastewater streams.

        Safety-Kleen performs services designed to dredge, treat and provide for
the  beneficial  reuse  of  sediments  found  in  harbors,  channels  and  other
waterways. The Company contracts with federal, state and local agencies and port
authorities for the cleanup of sediments resulting from downstream  accumulation
and waterway widening and deepening projects.  These services are provided as an
environmentally sound alternative to historical sea dumping methods.

        The Company  provides a variety of consulting  and  analytical  services
which utilize Safety-Kleen's laboratories,  specialized equipment and personnel.
Such services are typically  customized for the customer's  specific  project or
requirements.

        The  Company's  transportation  operations  facilitate  the  movement of
materials  between and occasionally  amongst the Company's network of Collection
and Recovery locations and its Treatment and Disposal facilities. Transportation
may be accomplished by truck, rail or other mode, with  Company-owned  assets or
in conjunction with third-party  transporters.  Specially  designed  containment
systems,  vehicles and other  equipment  permitted for hazardous and  industrial
waste  transport,  together with drivers  trained in  transportation  skills and
waste handling procedures, provide for the movement of customer waste streams.

                             COMPETITIVE CONDITIONS

        The  hazardous  and  industrial  waste  management  industry  is  highly
competitive.  The sources of competition vary by locality and by type of service
rendered,  with competition coming from the other major waste services companies
and hundreds of privately  owned firms which offer waste  services.  The Company
also  competes  with  municipalities  and larger  plants which provide "on site"
waste  services  for  their  own  waste  materials.  The  principal  methods  of
competition for all of the Company's services are price, quality, reliability of
service rendered and technical  proficiency in handling industrial and hazardous
wastes properly.

                                       5
<PAGE>

        The  Company  estimates  total  industry  revenue  associated  with  the
off-site  services it provides in North  America,  excluding Used Oil Collection
and Re-Refining, to be $7.4 billion. Of this market, the combined revenue of the
Company,  including  inter-company receipts at disposal locations,  for the year
ended August 31, 1999 would account for a 22% market share.

        In the United States, the original  generators of hazardous waste remain
liable under federal and state  environmental laws for improper disposal of such
wastes.  Even if waste generators employ companies which have proper permits and
licenses, knowledgeable customers are interested in the reputation and financial
strength of the companies  they use for  management of their  hazardous  wastes.
Safety-Kleen believes that its technical  proficiency,  reputation and financial
strength  are  important  considerations  to  its  customers  in  selecting  and
continuing to utilize the Company's services.

        The  Company  is the  market  leader in the  United  States in its Parts
Cleaner,  Paint  Refinishing and Dry Cleaner  Services.  In these services,  the
Company  competes with local or smaller  regional  companies.  In its Industrial
Waste   Services,   the  Company   competes  with  many  firms  engaged  in  the
transportation,  brokerage and disposal of hazardous  wastes through  recycling,
fuels programs, thermal treatment or landfilling.

        The  Company  is the  market  leader  in North  America  in its Used Oil
Collection and Re-Refining  Services.  The price at which Safety-Kleen sells its
re-refined  lube  oil is  primarily  dictated  by a  market  dominated  by large
multinational  oil  companies  and has been  positively  correlated to crude oil
prices over the  long-term.  The selling  price of  re-refined  lube oil is also
affected by lube oil refinery  capacity  changes in North America,  which do not
necessarily bear a relationship to the movement of crude oil price changes.

        Competitors   operate   large-scale   incinerators  at  eight  locations
throughout  North America.  Other companies have applied for or received permits
to construct  and operate  hazardous  waste  incinerators.  Competition  is also
encountered from certain cement kilns, which use hazardous waste-derived fuel as
a supplemental fuel source.  Generator-owned  thermal  treatment  operations and
mobile thermal  treatment  units also compete with the Company's  fixed-location
facilities.

        Ten of the 15 U.S. hazardous waste landfills not operated by the Company
are operated by three competitors with landfill facilities spread throughout the
United States.  Significant  competition  exists for waste volumes  generated by
remedial cleanups and other project-based events.

                                    CUSTOMERS

        The Company conducts  business with more than 400,000  customers.  These
customers  represent  diverse  industries,   including  automotive  repair,  dry
cleaning, photo imaging, automobile manufacturing and distribution, chemical and
petrochemical  manufacturing,  computer and micro-processor  manufacturing,  and
primary metals, paper,  furniture,  aerospace and pharmaceutical  manufacturing.
The  Company's  customers are located  throughout  the United States and Canada.
During fiscal 1999, no one customer accounted for more than three percent of the
Company's consolidated revenue.

        The hazardous and industrial  waste  management  business is cyclical to
the extent that it is dependent upon a stream of waste from cyclical industries.
If those cyclical industries slow  significantly,  the business that the Company
receives from those industries is likely to slow.

                                   SEASONALITY

        Adverse  winter  weather   moderately  affects  some  of  the  Company's
operations,  particularly during the second fiscal quarter.  The main reason for
this  effect  is  reduced  volumes  of waste  being  received  at the  Company's
facilities and higher  operating costs associated with operating in sub-freezing
weather and high levels of snowfall.

                                       6
<PAGE>

                                   REGULATION

Hazardous and Solid Waste Requirements

        Safety-Kleen's services involve the collection, transportation, storage,
processing,  recycling and disposal of commercial,  institutional and industrial
hazardous and nonhazardous  materials.  Substantially all of these materials are
regulated in the United States as "solid wastes" under the Resource Conservation
and Recovery Act (RCRA). In addition to being regulated as solid wastes, many of
these materials are further regulated as "hazardous  wastes."  Accordingly,  the
Company is subject to federal  and state  regulations  governing  hazardous  and
solid wastes.  RCRA  established a national  program  which  classified  various
substances  as  "hazardous  wastes",   established   requirements  for  storage,
treatment  and  disposal  of  hazardous  wastes  and  imposed  requirements  for
facilities used to store,  treat or dispose of such wastes.  RCRA was amended in
1984 by the Hazardous and Solid Waste  Amendments  ("HSWA")  which  expanded the
scope of RCRA to include  businesses which generate smaller  quantities of waste
materials  (so-called  "small  quantity  generators"),  expanded the  substances
classified as hazardous  wastes by RCRA and prohibited  direct disposal of those
wastes in landfills (thereby, in effect,  requiring that the wastes be recycled,
treated or destroyed).

        Hazardous and solid waste regulations impose  requirements which must be
met by facilities used to store, treat and dispose of these wastes. Operators of
hazardous   waste   storage,   disposal  and  treatment   facilities,   such  as
Safety-Kleen,  must  obtain a RCRA  permit  from  federal  or  authorized  state
governmental authorities to operate those facilities.  States may also require a
solid waste permit. The Company has over 100 RCRA-permitted facilities.

        The Company  believes that each permit will be renewed at the end of its
existing  term. At the present time,  the Company does not intend to pursue RCRA
permits for facilities  which do not currently have a RCRA permit and will limit
the activities of those facilities to activities that are not regulated by RCRA.

        In September  1992, the United States  Environmental  Protection  Agency
("EPA") enacted  regulations  that govern the management of used oils.  Although
used oil is not  classified  as a hazardous  waste under  federal  law,  certain
states do regulate  used oil as  hazardous.  The Company  built and operates its
used oil facilities to standards  similar to those required for hazardous  waste
facilities,  and believes that its oil management  standards are more protective
of human health and the environment than current federal standards.

        Materials  collected  by the  Company  through its  Industrial  Services
operations may be recycled for reuse,  processed into  waste-derived  fuel to be
burned in kilns used in the production of cement or incinerated in the Company's
incinerators.  Much of the  waste-derived  fuel is supplied to cement kilns with
which the Company has  exclusive  supply  contracts  with  respect to such fuel.
Cement  kilns are subject to  regulations  which govern the burning of hazardous
wastes in boilers  and  industrial  furnaces  ("Boiler  and  Industrial  Furnace
Regulations" or "BIF regulations"). Since 1980, under the authority of RCRA, EPA
has required incinerators to comply with provisions that are similar to those in
the BIF  regulations.  The Company believes that all of the kilns with which the
Company has exclusive  supply  contracts  and all of the Company's  incinerators
comply in all material respects with the applicable regulation requirements.

Clean Air Act

        The Clean Air Act was passed by  Congress to control  the  emissions  of
pollutants to the air and requires permits to be obtained for certain sources of
air toxic emissions or criteria  pollutants,  such as carbon monoxide.  In 1990,
Congress  amended  the  Clean  Air  Act to  require  further  reductions  of air
pollutants  with  specific  targets  for  nonattainment  areas  in order to meet
certain ambient air quality standards.  These amendments also require the EPA to
promulgate regulations which: (i) control emissions of 189 toxic air pollutants;
(ii) create uniform operating permits for major industrial facilities similar to
RCRA  operating  permits;   (iii)  mandate  the  phase-out  of  ozone  depleting
chemicals; and (iv) provide for enhanced enforcement.  The Company believes each
of  its  operating  facilities  complies  in  all  material  respects  with  the
applicable requirements.

        The Clean Air Act required  regulations  which resulted in the reduction
of volatile organic  compound  ("VOC")  emissions in order to meet certain ozone
attainment standards under the Act. The Company has installed control technology
to meet its obligations  under the Act.  Additional  emission  reductions at the
Company's  recycle

                                       7
<PAGE>

centers  and  branches  could  be  required  as the  Company  completes  its air
permitting  program.  On August 21, 1999,  the EPA adopted new federal Clean Air
Act  Rules for all  Hazardous  Waste  Combustion  Units.  These new  regulations
supersede  the  existing  BIF and RCRA  Subpart  "O"  permitting  and  operating
regulations.  This new rule sets emissions  standards for  incinerators,  cement
kilns and  lightweight  aggregate  kilns that burn  hazardous  waste.  These new
standards  require  cement  kilns  which are  major  outlets  for the  Company's
waste-derived fuels, to make capital improvements that will increase the cost of
burning such fuels in cement kilns. The  incinerators  owned by the Company must
also comply with this new rule.  Although  these  incinerators  already meet the
majority  of  the  emission  and  management  requirements  of  this  new  rule,
additional  capital may be required to install air pollution  control  equipment
and compliance  monitoring  devices to provide  assurance that the  requirements
will be met on a continuous  basis. The Company intends to be in compliance with
all aspects of this new rule, for  incineration  units owned and operated by the
Company, on or before September 27, 2002, which is the compliance  demonstration
deadline.

        The EPA is also developing  regulations which will establish  management
standards  for cement kiln dust  ("CKD").  The Company and the kilns to which it
sends   waste-derived   fuel  have   developed   programs  for   analyzing   and
characterizing CKD in anticipation of these new management  standards;  however,
at this time it is not clear what impact these CKD regulations  will have on the
Company.

        The South  Coast Air Quality  Management  District  ("SCAQMD"),  the air
district  for the greater Los  Angeles,  California  area,  has amended its rule
setting the allowable  volatile  organic  compound  ("VOC") content of materials
used for remote reservoir repair and maintenance cleaning.  The amended rule, in
effect, banned remote reservoir parts cleaning with solutions containing VOCs in
excess  of fifty  grams per  liter as of  January  1,  1999,  except in  certain
applications.  Substantially  all of the Company's  parts  cleaners  placed with
SCAQMD  customers prior to the adoption of the amended rule,  utilized  solvents
containing  VOCs in excess of fifty grams per liter.  The Company offers aqueous
parts cleaning  systems which meet the 1999 SCAQMD  requirements  and has worked
with its  SCAQMD  customers  to  convert  their  solvent  parts  cleaners  to an
alternative cleaning solvent or solution. In addition, the Company will continue
to work actively with the SCAQMD to identify appropriate  exemptions and develop
alternatives  to the 1999 VOC limits  for  materials  used for remote  reservoir
parts  cleaning.   The  Company  expects  other  Clean  Air  Act   nonattainment
municipalities to consider adopting similar rules.

Clean Water Act

        The Clean Water Act regulates  the discharge of pollutants  into surface
waters  and sewers  from a variety  of  sources,  including  disposal  sites and
treatment  facilities.  The Company is required to obtain discharge  permits and
conduct  sampling and  monitoring  programs.  The Company  believes  each of its
operating  facilities  complies in all  material  respects  with the  applicable
requirements.

CERCLA and Related Requirements

        The Comprehensive Environmental Response, Compensation and Liability Act
of 1980 ("CERCLA") was originally  enacted in December 1980, and amended in 1986
by the Superfund  Amendments and Reauthorization Act ("SARA").  CERCLA creates a
fund of monies  ("Superfund") which can be used by the EPA and state governments
to clean up hazardous  waste sites pending  recovery of those costs from defined
categories  of  "potentially  responsible  parties"  ("PRPs").  Most EPA cleanup
efforts are at sites listed or proposed  for listing on the National  Priorities
List ("NPL"). Various states have also enacted statutes which contain provisions
substantially similar to CERCLA.

        Generators and transporters of hazardous substances, as well as past and
present  owners  and  operators  of sites  where  there  has been a  release  of
hazardous  substances,  are made strictly,  jointly and severally liable for the
clean-up   costs   resulting   from   releases   and   threatened   releases  of
CERCLA-regulated "hazardous substances". Under CERCLA, these responsible parties
can be ordered  to perform a  clean-up,  can be sued for costs  associated  with
private  party or public agency  clean-up,  or can  voluntarily  settle with the
government concerning their liability for clean-up costs.

        A portion of the  materials  collected  by the Company  are  recycled or
converted  into  materials,  such as  industrial  fuels,  which  may be used for
another purpose. The amount of material that the Company deposits at waste sites
is  accordingly  small in relation to the volume of  materials  collected by the
Company,  and the Company is

                                       8
<PAGE>

actively  engaged in a waste  minimization  program to reduce this small  amount
even  further.  The  Company  also sends some of the  materials  it  collects to
selected  third  party  facilities  for  further  treatment,  processing  and/or
disposal.  The Company audits  facilities where it ships materials in an attempt
to minimize its potential Superfund liability at these sites.

                      ENVIRONMENTAL LIABILITIES AND CAPITAL EXPENDITURES

        A  portion  of  the  Company's  capital   expenditures  are  related  to
compliance with environmental laws and regulations.  The Company does not expect
that  compliance with RCRA, the Clean Air Act and other  environmental  laws and
regulations  currently  in effect will have a material  impact on the  Company's
projected  annual  capital  expenditures,  results of operations or  competitive
position.

        In addition to these capital  expenditures,  the Company may incur costs
in connection with closure  activities at certain of its sites. When the Company
discontinues  using or changes the use of a  hazardous  waste  management  unit,
formal closure procedures must be followed, and such procedures must be approved
by federal or state environmental authorities. In some cases, costs are incurred
to complete  remedial  clean-up  work at the site. In addition at certain of the
Company's other operating sites,  remedial  clean-up work is required as part of
the RCRA  Corrective  Action  Program or other  state and federal  programs.  As
included in the Company's Consolidated Balance Sheet and more fully described in
Note 8 of the Notes to Consolidated Financial Statements,  included elsewhere in
this report on Form 10-K, the Company has recorded liabilities of $248.0 million
as of August 31, 1999,  for remedial  cleanup work,  Superfund  site  liability,
closure  activities  and certain  other  environmental  expenses  related to its
operating and previously closed sites.

        With respect to various operating facilities, the Company is required to
provide financial assurance with respect to certain statutorily required closure
and  post-closure  obligations  totaling  $502.2 million at August 31, 1999. The
Company provides most of the required financial  assurance through a combination
of  performance  bonds and  insurance  policies,  as allowed  by the  applicable
regulatory authorities.

                                    EMPLOYEES

        As of August  31,  1999,  approximately  9,990  employees  provided  the
Company's  hazardous and  industrial  waste  services.  Approximately  8% of the
Company's  employees were represented by various  collective  bargaining groups.
Management believes that its relations with its employees are good.

                      EXECUTIVE OFFICERS OF THE REGISTRANT

        The  following  sets  forth  certain  information  with  respect  to the
executive officers of the Company:

NAME                          AGE      POSITION HELD

Kenneth W. Winger             61       President and Chief Executive Officer

Michael J. Bragagnolo         53       Executive Vice President and Chief
                                       Operating Officer

Paul R. Humphreys             40       Senior Vice President, Finance and Chief
                                       Financial Officer

Henry H. Taylor               55       Vice President, General Counsel and
                                       Secretary

         Kenneth W. Winger became  President and Chief Executive  Officer on May
15, 1997. Mr. Winger served as President and Chief Operating  Officer of Laidlaw
Environmental Services (US), Inc. ("Old LESI") from July 15 1995 until May 1997.
He served as Executive Vice President for Business  Development of Laidlaw Waste
Systems,  Ltd.,  a former  subsidiary  of Laidlaw,  from January 1995 until July
1995.  Prior to that,  Mr. Winger served as Senior Vice  President for Corporate
Development with Laidlaw from May 1991.

                                       9
<PAGE>

         Michael  J.  Bragagnolo  became  Executive  Vice  President  and  Chief
Operating  Officer on May 15,  1997.  He joined Old LESI in January  1997 as the
Executive  Vice  President  after  serving as Executive  Vice  President of U.S.
Operations for Laidlaw Waste Systems, Ltd. since 1992.

        Paul R.  Humphreys  became  Senior Vice  President,  Finance,  and Chief
Financial  Officer on May 15,  1997.  He joined Old LESI in January 1995 as Vice
President of Finance. He previously served as Manager of Finance for Laidlaw for
more than five years.

         Henry H. Taylor became Vice President, General Counsel and Secretary on
May 15, 1997. He served as Vice  President of Legal and  Regulatory  Affairs and
Secretary of Old LESI from  September 1995 until May 1997. Mr. Taylor joined Old
LESI in May 1990 as Vice President of Legal Affairs.

                   FACTORS AFFECTING FUTURE OPERATING RESULTS

        The provisions of the Private  Securities  Litigation Reform Act of 1995
(the "Act"),  which  became law in late 1995,  provides  companies  with a "safe
harbor" when making  forward-looking  statements.  This "safe harbor" encourages
companies to provide prospective  information about their companies without fear
of  litigation.  The  Company  wishes to take  advantage  of the  "safe  harbor"
provisions of the Act and is including this section in its Annual Report on Form
10-K in order to do so.  Statements  that are not  historical  facts,  including
statements about management's  expectations for fiscal year 2000 and beyond, are
forward-looking statements and involve various risks and uncertainties.  Factors
that  could  cause  the  Company's  actual  results  to differ  materially  from
management's projections, forecasts, estimates and expectations include, but are
not limited to, the following:

Uncertainties in integrating operations and achieving cost savings

        The Company,  including its  subsidiaries,  is a large  enterprise  with
operations  in  different  markets.  The  success of any  business  combination,
including the  Company's  recent  acquisition  of Old  Safety-Kleen,  is in part
dependent on the Company's  ability  following the  acquisition  to  consolidate
operations and integrate departments,  systems and procedures and thereby obtain
business  efficiencies,  economies  of  scale  and  related  cost  savings.  The
consolidation  of  operations,  the  integration  of  departments,  systems  and
procedures  and  the  reallocation  of  staff  present  significant   management
challenges.  There can be no  assurance  that future  consolidated  results will
improve as a result of the Old Safety-Kleen acquisition,  or as to the timing or
extent to which cost savings and efficiencies anticipated by the Company will be
achieved.  The Company  cannot  presently  quantify  the impact of  achieving or
failing to achieve anticipated synergies on the Company's earnings per share.

Ability to exert significant influence

        As of August 31, 1999, Laidlaw beneficially owned 43.6% of the Company's
outstanding  Common Stock.  Laidlaw announced publicly on September 13, 1999 its
intention  to divest  itself of all the Company  Common Stock owned by it within
six to  twelve  months.  Such  a  transaction  could  materially  affect  future
operating  results.  However,  because the Company  does not know when or if any
such  transaction  will  take  place or the form of any  such  transaction,  the
Company  cannot  predict the effect such a transaction  would have on the future
operations of the Company.

Leverage

        The  Company  is  highly   leveraged  with   substantial   debt  service
obligations.  Principal repayment obligations with respect to the long term debt
aggregates  $731.0  million  over the next  five  years.  Thus  the  Company  is
particularly susceptible to adverse changes in its industry, the economy and the
financial markets. In addition,  the Company's ability to obtain additional debt
financing will be limited by restrictive covenants under the terms of its credit
agreements and any other debt  instruments.  Those limits on financing may limit
the  Company's  ability  to  service  its  existing  debt  obligations   through
additional  debt  financing  if cash flow from  operations  is  insufficient  to
service such obligations.

                                       10
<PAGE>


Environmental Regulation and Legal Proceedings

        The  operations  of  businesses  of the  Company  are subject to certain
federal,  state,  territorial,  provincial and local requirements which regulate
health, safety,  environment,  zoning and land-use.  Operating and other permits
are  generally  required  for  incinerators,  landfills,  transfer  and  storage
facilities,  certain  collection  vehicles,  storage tanks and other  facilities
owned or operated by the Company,  and these permits are subject to  revocation,
modification and renewal. Although the Company believes that its facilities meet
federal,  state and local  requirements in all material respects and have all of
the  required  operating  and  other  permits,  it may be  necessary  to  expend
considerable  time, effort and money to keep existing or acquired  facilities in
compliance  with  applicable  requirements,  including new  regulations,  and to
maintain  existing permits and approvals and to obtain the permits and approvals
necessary to increase their capacity. Applicable requirements are enforceable by
injunctions  and  fines  or  penalties,   including  criminal  penalties.  These
regulations  are  administered  by the EPA and various other federal,  state and
local  environmental  and health and safety agencies and authorities,  including
the  Occupational  Safety  and  Health   Administration  of  the  United  States
Department of Labor and by the provincial environmental ministries in Canada.

        CERCLA imposes liability for damages and the cleanup of sites from which
there is a release or  threatened  release  of a  hazardous  substance  into the
environment on generators and  transporters as well as current and former owners
and operators of such sites.  Given the  substantial  costs involved in a CERCLA
cleanup and the difficulty of obtaining  insurance for environmental  impairment
liability,  such  liability  could  have a  material  impact  on  the  Company's
business, financial condition and future prospects.

        The Company is required to provide  certain  financial  assurances  with
respect to certain  statutorily  required closure and  post-closure  obligations
related to various operating facilities. These financial assurances may take the
form of insurance,  guarantees, bonds, letters of credit or deposits of cash, to
the extent  acceptable to the United States,  Canadian or other foreign,  state,
territorial,   federal,   provincial   or  local  courts,   executive   offices,
legislatures,    governmental    agencies   or   ministries,    commissions   or
administrative,  regulatory or self-regulatory  authorities or instrumentalities
("Governmental Entities") requiring such assurances.  There is no guarantee that
the Company will be able to provide the required financial  assurances,  without
increased cost, or at all.

        In addition to the costs of complying  with  environmental  regulations,
hazardous  waste treatment  companies  generally will continue to be involved in
legal  proceedings in the ordinary  course of business.  Alleged  failure by the
Company to comply with laws and  regulations may lead to the imposition of fines
or the denial,  revocation  or delay of the  renewal of permits and  licenses by
Governmental  Entities.  In  addition,  such  Governmental  Entities  as well as
surrounding  landowners  may claim that the Company is liable for  environmental
damages.  Citizens  groups have become  increasingly  active in challenging  the
grant or renewal of permits and  licenses for  hazardous  waste  facilities  and
responding to such  challenges has further  increased the costs  associated with
establishing  new  facilities  or expanding  current  facilities.  A significant
judgment against the Company, the loss of a significant permit or license or the
imposition of a  significant  fine could have a material  adverse  effect on the
Company's  business,  financial  condition and future prospects.  The Company is
currently  a party  to  various  legal  proceedings,  as  well as  environmental
proceedings, which have arisen in the ordinary course of its business.

        Based on its past  experience  and its knowledge of pending  cases,  the
Company believes it is unlikely that the Company's actual liability on cases now
pending (including enforcement actions of the type described above and CERCLA or
state  superfund  cases) will be materially  adverse to the Company's  financial
condition. It should be noted, however, that many environmental laws are written
and enforced in a way in which the potential  liability can be large,  and it is
always  possible that the Company's  actual  liability in any particular case or
claim will prove to be larger than  anticipated  and accrued for by the Company.
It is also possible that expenses  incurred in any particular  reporting  period
for remediation costs or for fines, penalties or judgments could have a material
impact on the Company's results of operations for that period.


                                       11
<PAGE>

Competitive Environment

        The Company operates in highly  competitive  environments.  In addition,
the hazardous waste industry is changing as a result of rapid consolidation. The
future  success of the Company will be affected by such  changes,  the nature of
which cannot be forecast  with  certainty.  There can be no assurance  that such
developments will not create additional  competitive  pressures on the Company's
business.

International Operations

        The Company has business  operations  in the United  States,  Canada and
Western  Europe.  Certain  risks  are  inherent  in  international   operations,
including the risks of differing regulation, currency fluctuations and differing
tax  treatment.   The  Company  is  subject  to  Canadian,   United  States  and
European-based environmental and other regulations.  Also, the relative value of
United States dollar,  Canadian dollar and European currencies could change. The
impact of future exchange rate  fluctuations on the results of operations cannot
be accurately predicted.  The Company is subject to United States,  European and
Canadian tax laws and regulations.  The application of United States and foreign
tax laws and regulations to Company and to intercompany relationships is subject
to audit and  review by  independent  national  tax  authorities.  In  addition,
business  practices  or  laws  in  Europe  may  impose  costs,  restrictions  or
requirements  on such  activities  that differ in significant  respects from the
United States business environment.

Cyclical And Seasonal Nature Of Business

        The  hazardous  waste  business  is  cyclical  to the extent  that it is
dependent  upon a stream of waste from cyclical  industries.  If those  cyclical
industries slow significantly, the business that the Company receives from those
industries is likely to slow. Also, the Company's  business is somewhat seasonal
in that generally less waste is received in winter months.

Dividends

        The Company has not paid cash dividends during the past two fiscal years
and does not presently  anticipate  paying any cash dividends in the future.  In
addition,  the Company's  existing credit facility precludes the payment of cash
dividends.

ITEM 2.   PROPERTIES

        In North  America,  the Company  operates in 45 states,  seven  Canadian
provinces and Puerto Rico.

        In North  America,  the  Company's  sales  and  service  representatives
operate out of approximately 176 branch facilities. Of these, approximately half
are leased and half are owned.  A typical branch is  approximately  8,000 square
feet.

        The Company has 31 service/accumulation centers across the United States
and  Canada.  Of  these,  25  are  owned.  These  locations  serve  branches  by
accumulating  shipments of waste from the Industrial Services and Commercial and
Institutional Service offerings. As truckload quantities are collected, they are
transported  from these  locations  to the  treatment  and disposal or recycling
plants.

        The  Company  owns 10 solvent  recycling  plants in the  United  States,
Canada and Puerto Rico. In total, these plants have an annual recycling capacity
of 63  million  gallons of parts  cleaner  solvents  and 15  million  gallons of
halogenated,  fluorinated and flammable solvents.  The total storage capacity of
these plants is approximately 8.2 million gallons. In addition, the Company owns
two  fuel-blending  facilities,  located on leased  land,  and has an  exclusive
supply arrangement for its waste-derived fuel with a third facility. These three
facilities have combined storage capacity of approximately two million gallons.

        The  Company  owns two oil  re-refining  plants  with a combined  annual
re-refining  capacity of  approximately  130 million  gallons.  These plants are
located in Breslau, Ontario and East Chicago, Indiana.

                                       12
<PAGE>

        The Company  owns one and leases  five  distribution  facilities  in the
United States, averaging approximately 45,000 square feet each.

        The Company  operates eight  commercial  incineration  facilities and 11
landfills  throughout the United States and Canada,  all of which are owned. The
Company also operates 15 other treatment and disposal facilities,  of which nine
are leased.

        The Company operates  approximately  3,800 step vans, straight truck and
tractors,  650 tank and vacuum trucks, 1,200 light duty trucks and 1,800 trailer
units,  most of which  are  owned by the  Company.  The  Company  also  operates
approximately 1,250 leased railroad tanker cars.

        The Company  owns a 106,000  square foot plant in New Berlin,  Wisconsin
where parts cleaner machines are assembled and buffing pads are manufactured.

        The Company owns a 66,000 square foot  technical  center  located in Elk
Grove Village, Illinois.

        The Company owns a 285,000 square foot  administrative  office  building
located in Elgin, Illinois. The building was the premises for Old Safety-Kleen's
corporate headquarters. The Company intends to sell this property.

        The Company leases 92,000 square feet of office space in Columbia, South
Carolina for its corporate headquarters.

ITEM 3.   LEGAL PROCEEDINGS

                                     GENERAL

        The business of the Company's hazardous and industrial waste services is
continuously regulated by federal,  state,  provincial and local provisions that
have been enacted or adopted,  regulating  the  discharge of materials  into the
environment  or primarily for the purpose of  protecting  the  environment.  The
nature of the Company's businesses results in its frequently becoming a party to
judicial or  administrative  proceedings  involving  all levels of  governmental
authorities and other interested parties. The issues that are involved generally
relate to  applications  for  permits  and  licenses  by the  Company  and their
conformity with legal requirements and alleged technical  violations of existing
permits and  licenses.  The Company  does not believe  that these issues will be
material to the Company's operations or financial condition. At August 31, 1999,
subsidiaries of the Company were involved in four proceedings of the latter type
relating  primarily  to  activities  at waste  treatment,  storage and  disposal
facilities  where the Company believes  sanctions  involved in each instance may
exceed  $100,000.  The Company  believes that the ultimate  disposition of these
issues will not have a materially adverse effect upon the Company's consolidated
financial position or results of operations.

        From  time to time,  the  Company  is named as a  defendant  in  various
lawsuits  arising in the  ordinary  course of  business,  including  proceedings
wherein  persons  claim injury  resulting  from the use of the  Company's  parts
cleaner equipment and/or cleaning  products,  other matters  involving  personal
injury and property  damage claims and  employment-related  claims.  A number of
such legal proceedings are currently pending in various courts and jurisdictions
throughout North America.  Based on the Company's assessment of known claims and
its historical claims payment pattern, and discussions with internal and outside
legal counsel and risk management personnel,  the Company believes that there is
no proceeding  pending against the Company  relating to such matters arising out
of the ordinary course of business that, if resolved against the Company,  would
have a  materially  adverse  effect upon the  Company's  consolidated  financial
position or results of operations.

        In the United States,  CERCLA imposes financial liability on persons who
are  responsible for the release of hazardous  substances into the  environment.
Present  and  past  owners  and  operators  of  sites  which  release  hazardous
substances,  as well as generators and  transporters of the waste material,  are
jointly and severally liable for remediation costs and environmental  damage. At
August  31,  1999,  the  Company  had been  notified  that it was a  potentially
responsible  party  in  connection  with 51  locations  in its  hazardous  waste
management and other businesses. The Company continually reviews its status with
respect to each  location  and the  extent of its  alleged

                                       13
<PAGE>

contribution  to the volume of waste at the  location,  the  available  evidence
connecting the Company to that location, and the numbers and financial soundness
of other potentially  responsible parties at the location.  Based upon presently
available  information,  the Company does not believe that potential liabilities
arising  from its  involvement  with these  locations  will be  material  to the
Company's operations or financial condition.

                             VILLE MERCIER FACILITY

        On May 10, 1991,  representatives  of the Ministry of the Environment of
the  Province of Quebec  conducted a search on property of a  subsidiary  of the
Company in Ville  Mercier  pursuant to a search  warrant  issued on the basis of
allegations that the subsidiary,  prior to its acquisition, had during the years
1973, 1974 and 1975,  illegally buried between 500 and 600 barrels of industrial
waste in the ground on the site.  As a result of that  search and the finding of
barrels  of  industrial   waste,   the  subsidiary   immediately   undertook  an
investigation   and  submitted  a  restoration  plan  to  the  Ministry  of  the
Environment and in fact,  commenced the restoration  activity.  On May 24, 1991,
the  Minister of the  Environment  issued an order under the  provisions  of the
Environment Quality Act, ordering the subsidiary to collect all the contaminants
dumped,  emitted,  issued or  discharged  into the  environment.  This order was
issued  without  notice  to the  subsidiary  at a time when the  subsidiary  was
already carrying out its restoration  plan. The subsidiary filed a motion in the
Superior Court in the Province of Quebec and the District of Montreal seeking an
order to, among other things,  cancel and annul the order on the basis, that the
burial of the barrels  between  1973 and 1975 did not  constitute  an actual and
current  discharge,  emission or deposit of contaminants  into the  environment,
justifying  the 1991 order under the law and that the order did not identify the
contaminants that the subsidiary was required to remove, their location,  or the
time in which  this  should be  accomplished.  Following  implementation  of the
restoration plan, these proceedings were suspended. Management believes that the
restoration plan submitted by the subsidiary as amended after  consultation with
the Ministry of the Environment has been implemented and that any  contamination
resulting from the barrels of industrial waste has been remediated.

        Unrelated to the barrels of  industrial  waste  referred to above,  in a
letter dated June 19, 1992, the Quebec Ministry of the Environment requested the
subsidiary to advise the Ministry,  within 30 days of receipt of the request, of
its intentions concerning the carrying out of certain  characterization  studies
of soil and water and  restoration  work with  respect to  certain  areas of the
Ville Mercier property.  In 1968, the Quebec government issued two permits to an
unrelated  company to dump organic  liquids  into  lagoons on the Ville  Mercier
property. By 1971, groundwater  contamination had been identified.  In 1972, the
Quebec  government  provided an alternate water supply to Ville Mercier.  In the
same year,  the permit  authorizing  the dumping of liquids was terminated and a
permit to operate an organic liquids  incinerator on the property was granted to
an entity which was  indirectly  acquired by the Company in 1989.  In 1973,  the
Quebec  government  contracted with the  incinerator  operator to incinerate the
pumpable  liquids in the lagoons.  In 1980, the  incinerator  operator  removed,
solidified  and  disposed  of the  non-pumpable  material  from the lagoons in a
secure cell and  completed  the closure of the  lagoons at its own  expense.  In
1983, the Quebec  government  constructed and continues to operate a groundwater
pumping and treatment  facility near the lagoons.  The Company believes that its
subsidiary  is  not  the  party  responsible  for  the  lagoon  and  groundwater
contamination.  By letter dated July 17, 1992, the subsidiary responded by first
denying any responsibility for the  decontamination  and restoration of its site
and secondly,  by proposing that the Quebec  Ministry of the Environment and the
subsidiary form a working group to find the most appropriate  technical solution
to the contamination  problem.  On November 16 and 25, 1992, the Minister of the
Environment,  pursuant to the provisions of the Environment  Quality Act, served
the subsidiary with two Notices alleging that the subsidiary was responsible for
the  presence of  contaminants  on its  property  and that of its  neighbor  and
ordering  the  subsidiary  to  take  all the  necessary  measures  to  excavate,
eliminate or treat all of the contaminated soils and residues located within the
areas  defined in the Notices  and to recover and treat all of the  contaminated
waters resulting from the aforementioned  measures. The Notices further provided
that failing the receipt by the  Department of  Environment,  within ten days of
the date of service of the Notices, of an undertaking by the subsidiary to carry
out the aforementioned  measures,  the Minister of the Environment would proceed
to do the work and would claim from the subsidiary the direct and indirect costs
relating to such work.

        By  letter  dated  November  25,  1992,  the  subsidiary   responded  by
reiterating  its position that it had no  responsibility  for the  contamination
associated with the discharges of wastes into the former Mercier Lagoons between
1968 and 1972 and  proposing  to submit the  question of  responsibility  to the
Courts for determination as expeditiously as possible through the cooperation of
the parties' respective  attorneys.  Concurrently,  the subsidiary

                                       14
<PAGE>

undertook to prepare and submit to the Department of the Environment a technical
plan to address the  contamination  on the site identified in the notices.  This
plan was developed with the assistance of highly  qualified  experts from Quebec
and elsewhere in North America  drawing upon all available  information  and was
submitted to the Minister of the Environment.  By letter dated December 7, 1992,
the subsidiary  submitted to the Minister of the Environment a document entitled
"Detailed Scope of Work for the Groundwater  Contamination  Panel Ville Mercier,
Quebec".  This  proposal by the  subsidiary  was refused by the  Minister of the
Environment  by letter  dated  December  22, 1992 on the grounds that it did not
meet the terms of the above mentioned Notices issued against the subsidiary. The
Minister  published  a request  for  tenders  for the  preparation  of plans and
specifications  with respect to the excavation  and storage of the  contaminated
soils.  The  Minister  also  retained  six  independent  experts  to review  the
subsidiary's technical plan. This panel of experts subsequently submitted to the
Minister  of  the  Environment  its  recommended   methodology  to  address  the
contamination on the site.

        The Minister of the Environment convened a public hearing which reviewed
the report  submitted to the Minister by the experts he retained and recommended
to the  Minister  what  remedial  plan  should  be  instituted  to  address  the
contamination on the site.

        The subsidiary filed legal proceedings  seeking a court determination of
the liability  associated with the  contamination of the former Mercier lagoons.
The subsidiary  asserted that it has no responsibility  for the contamination on
the site.  The  Minister  claimed that the  subsidiary  is  responsible  for the
contamination  and should reimburse the Province of Quebec for costs incurred to
the present in the amount of $17.4  million  Canadian and should be  responsible
for future remediation costs.

        On or about  February  9 and March 12,  1999,  Ville  Mercier  and three
neighboring   municipalities   filed  separate  legal  proceedings  against  the
subsidiary and certain related  companies  together with certain former officers
and directors,  as well as against the Government of Quebec. The lawsuits assert
that the defendants are jointly and severally  responsible for the contamination
of groundwater in the region, which Plaintiffs claim was caused by contamination
from the  former  Ville  Mercier  lagoons,  and which  they  claim  caused  each
municipality  to incur  additional  costs to  supply  drinking  water  for their
citizens  since the 1970's and early  1980's.  The four  municipalities  claim a
total of  CDN$1,595,000 as damages for additional costs to obtain drinking water
supplies and seek an  injunctive  order to obligate the  defendants to remediate
the  groundwater in the region.  The subsidiary  will continue to assert that it
has no responsibility for the ground water contamination in the region.

        Pursuant to the  Agreement  dated  February 6, 1997,  among the Company,
Laidlaw and Laidlaw  Transportation,  Inc., Laidlaw and Laidlaw  Transportation,
Inc. agreed to indemnify and hold harmless the Company and its  subsidiaries for
any damages  resulting  from the  remediation  of  contaminated  soils and water
arising from the former  lagoon sites and the  operation of the  incinerator  at
Mercier,  Quebec.  The  indemnification is only to the extent that the aggregate
cash  expenditure  with respect to such damages  exceeds in the aggregate (i) $1
million  during such year and (ii) since 1997, an amount equal to the product of
$1 million  times the number of years that have  elapsed  since  1997;  however,
there shall be no indemnification  for any cash expenditures  incurred more than
six years after 1997.  The Company  believes  that the ultimate  disposition  of
these  issues  will not have a  materially  adverse  effect  upon the  Company's
consolidated financial position or results of operations.

                      SAFETY-KLEEN (PINEWOOD), INC. FINANCIAL ASSURANCE

        A subsidiary of the Company, Safety-Kleen (Pinewood), Inc. ("Pinewood"),
owns and operates a hazardous waste landfill near the Town of Pinewood in Sumter
County,  South  Carolina.  South  Carolina law  requires  that  hazardous  waste
facilities provide evidence of financial  assurance for potential  environmental
cleanup  and  restoration  in form and  amount  to be  determined  by the  South
Carolina Department of Health and Environmental Control ("DHEC").

        In its order dated May 19, 1994, the Board of DHEC (the "Board") decided
that over a ten year period  Pinewood must  establish a cash funded trust in the
amount of $133  million,  adjusted for  inflation,  as financial  assurance  for
potential  environmental cleanup and restoration.  In August 1994, Pinewood paid
approximately $14 million cash into the trust fund as a first  installment.  The
cash funded trust now stands at approximately $18 million.  Pinewood appealed to
the  South  Carolina  Circuit  Court  contesting  the  legality  of the  Board's
determination.

                                       15
<PAGE>

        In June  1995,  DHEC  promulgated,  and the South  Carolina  legislature
approved,  regulations  governing financial assurance for environmental  cleanup
and restoration  giving  owner/operators of hazardous waste facilities the right
to choose from among six options for providing financial assurance.  The options
include insurance, a bond, a letter of credit, a cash trust fund and a corporate
guaranty with a financial test.

        In June 1995, under authority of the new regulations, Pinewood submitted
financial assurance for potential environmental cleanup and restoration composed
of a combination of the existing State  Permitted Sites Fund (this is a state of
South  Carolina fund created by statute and funded by hazardous  waste  disposal
taxes) in the  amount of  approximately  $8 million  and the  balance of a total
package of $135  million by way of a corporate  guaranty by Laidlaw  Inc. in the
amount of approximately  $127 million.  Pinewood also left in place the existing
cash  trust fund in the  amount of  approximately  $16  million.  DHEC  accepted
Pinewood's financial submittal. On September 15, 1995, DHEC issued a declaratory
ruling   finding  the  new   regulations   applicable  to  financial   assurance
requirements for Pinewood. A group of parties opposed to the ruling appealed the
declaratory  ruling to the South Carolina  Circuit Court.  The opposing  parties
include  Citizens Asking for a Safe  Environment,  Energy  Research  Foundation,
County  of  Sumter,  Sierra  Club,  County  of  Clarendon,   The  Sumter  County
Legislative  Delegation,  the South Carolina Department of Natural Resources and
the South Carolina Public Service  Authority.  In June 1996,  Pinewood submitted
and DHEC  accepted a similar  financial  assurance  package for the state fiscal
year  ended  June 30,  1997.  In June  1997,  June 1998 and June  1999  Pinewood
submitted and DHEC approved  financial  assurance  packages for the state fiscal
years ending June 30, 1998,  1999 and 2000,  consisting  of the State  Permitted
Sites Fund  (approximately  $11  million),  the cash trust fund in the amount of
approximately  $18 million and the balance of a total  package of  approximately
$140 million in insurance coverage in replacement of the Laidlaw guarantee.

        Pinewood's  appeal  of the May 19,  1994  DHEC  order  and the  opposing
parties'  appeal  of  the  September  15,  1995  DHEC  declaratory  ruling  were
consolidated in the South Carolina  Circuit Court in the case captioned  Laidlaw
Environmental  Services of South Carolina,  Inc. et. al.,  Petitioners vs. South
Carolina Department of Health and Environmental Control and South Carolina Board
of Health and Environmental  Control,  Respondents - Energy Research Foundation,
et  al.,   Intervenors,   Docket   Numbers   C/A   94-CP-43-175,   94-CP-43-178,
94-CP-40-1412 and  94-CP-40-1859.  A decision was issued by the Circuit Court on
August 19, 1997 finding the regulation legally valid and applicable to financial
assurance  requirements of the Pinewood landfill.  Opposing parties appealed the
decision to the South  Carolina  Court of Appeals.  The South  Carolina Court of
Appeals heard  arguments in the case on September 9, 1999 and it is  anticipated
that a decision  of the Court of  Appeals  will be issued  during the  Company's
fiscal year ending  August 31,  2000.  A decision  adverse to the Company  could
result in the reinstatement of the May 19, 1994 DHEC order. The Company believes
that the  regulations  promulgated in June 1995 are legally valid and applicable
to  financial  assurance  requirements  for the Pinewood  landfill.  The Company
believes  that  the  ultimate  disposition  of  these  issues  will  not  have a
materially adverse effect upon the Company's  consolidated financial position or
results of operations.

                                   TAX MATTERS

        Laidlaw's  United States  subsidiaries  petitioned the United States Tax
Court  (captioned  as Laidlaw  Transportation,  Inc. and  Subsidiaries  et al v.
Commissioner of Internal Revenue,  Docket Nos. 9361-94 and 9362-94) with respect
to their  consolidated  federal  income tax  returns  (which  until May 15, 1997
included  certain of the Company's  United States  subsidiaries)  for the fiscal
years ended August 31, 1986, 1987 and 1988. The principal issue involved related
to the timing and  deductibility  for tax purposes of interest  attributable  to
loans owing to related foreign  persons.  Judge John O. Colvin issued an opinion
on June 30, 1998 concluding that advances from Laidlaw's  related foreign entity
were  equity  rather  than  debt  and  that  interest  deductions  claimed  were
disallowed.  Similar claims were asserted with respect to Laidlaw's consolidated
federal income tax returns for the fiscal years ended August 31, 1989,  1990 and
1991 and a petition  was filed with the United  States Tax Court with respect to
these years  (captioned  as Laidlaw  Transportation,  Inc. and  Subsidiaries  v.
Commissioner  of  Internal  Revenue,  Docket No.  329-98).  In  September  1998,
Laidlaw's United States subsidiaries received a thirty day letter proposing that
the  subsidiaries  pay  additional  taxes  relating to disallowed  deductions in
federal income tax returns for the fiscal years ended August 31, 1992,  1993 and
1994 based on the same issues.  Entry of the decision  relating to the Tax Court
opinion was deferred to allow Laidlaw and the  Commissioner of Internal  Revenue
to engage in  discussions  to resolve  issues  relating to all fiscal years from
1986 through 1994.

                                       16
<PAGE>

        On March 1, 1999,  Laidlaw,  Inc.  announced a settlement of the dispute
between its United States  subsidiaries and the Commissioner of Internal Revenue
relating  to  the  timing  and   deductibility  for  tax  purposes  of  interest
attributable  to loans owing to related  foreign  persons  during the years from
1986 to  1994.  The  total  net  after  tax  cash  cost  to  Laidlaw,  Inc.  was
approximately  $226 million compared with more than $500 million should Laidlaw,
Inc. have been required to pay all claims on these issues for these periods. The
payment includes  approximately  $121 million in taxes together with interest of
approximately  $161 million ($105 million after tax) of which $281.1 million was
paid by August 31,  1999 and the  balance in  September  1999.  This  settlement
resolves   matters  in  the  United  States  Tax  Court  (captioned  as  Laidlaw
Transportation,  Inc. and  Subsidiaries  v.  Commissioner  of Internal  Revenue,
Docket Nos.  9361-94 and  329-98)  relating to the 1986 to 1991 fiscal  years as
well as claims raised in the thirty day letter relating to 1992 to 1994.

        Pursuant to the  agreement  dated  February  6, 1997 among the  Company,
Laidlaw and Laidlaw  Transportation,  Inc., Laidlaw and Laidlaw  Transportation,
Inc. are responsible for any tax liabilities resulting from these matters. Based
upon discussions with Laidlaw,  the Company's income tax provision determined on
a  separate  return  basis  during the period  audited by the  Internal  Revenue
Service  was  sufficient  and no  additional  tax or  interest is due to or from
Laidlaw as a result of the settlement.

ITEM 4.   SUBMISSION OF MATTERS TO A VOTE OF SECURITY HOLDERS

        The Company held a Special  Meeting of  Shareholders on August 27, 1999.
At the meeting,  shareholders  approved the Company's  proposal  relating to the
issuance of shares of common stock of the Company, par value $1.00 per share, to
Laidlaw  International  Finance  Corporation  ("LIFC") or another  affiliate  of
Laidlaw  Inc.,  in  connection  with the  Company's  proposed  repurchase of its
outstanding $350 million 5% Subordinated  Convertible  Pay-In-Kind Debenture due
2009 held by LIFC.  79.4% of the  outstanding  shares  were  represented  at the
meeting. The following table sets forth the voting results:

                                                               Abstentions and
                               For              Against       Broker Non-Votes
                               ---              -------       ----------------
Issuance of Stock           70,038,779          484,455            106,897
                              99.1%               .7%                .2%

                                     PART II
                                     -------

ITEM 5.   MARKET FOR REGISTRANT'S COMMON EQUITY AND RELATED STOCKHOLDER MATTERS

        On August 27, 1999, in connection  with the  repurchase of the Company's
$350 million 5% Subordinated Convertible Pay-In-Kind debenture (the "Debenture")
and payment of accrued interest thereon, the Registrant issued 11,697,613 shares
of its common  stock,  par value $1.00 per share ("SK Stock"),  beneficially  to
Laidlaw through Laidlaw's  subsidiary.  The Company believes that the shares are
exempt from  registration  pursuant to Section  (4)(2) of the  Securities Act of
1933,  as amended  (the "Act").  In  determining  to issue the SK Stock  without
registration under the Act, management considered the fact that the offering was
being  made to a  single  offeree  in  connection  with  the  repurchase  of the
Debenture.

        The section entitled  "Shareholder  Information"  appearing on page 8 in
the  Company's  1999 Annual Report to  Stockholders  is  incorporated  herein by
reference.

ITEM 6.   SELECTED FINANCIAL DATA

        The section entitled "Financial  Highlights and Selected Financial Data"
appearing  on page 1 in the  Company's  1999 Annual  Report to  Stockholders  is
incorporated herein by reference.

                                       17

<PAGE>

ITEM 7. MANAGEMENT'S  DISCUSSION AND ANALYSIS OF FINANCIAL CONDITION AND RESULTS
        OF OPERATIONS

        The following discussion and analysis should be read in conjunction with
the  Company's  consolidated  financial  statements  and related  notes  thereto
included elsewhere herein.

         Results  associated with the April 1, 1998  acquisition of Safety-Kleen
Corp. ("Old Safety-Kleen") by Laidlaw Environmental  Services, Inc. ("Old LESI")
have been included in the Company's  consolidated  results as of the date of the
acquisition.

        Results associated with the May 15, 1997 reverse  acquisition of Rollins
Environmental  Services,  Inc. ("Rollins") (the "Rollins Acquisition") have been
included  in  the  Company's   consolidated  results  as  of  the  date  of  the
acquisition.

        The  following  discussion  and analysis  includes  statements  that are
considered  forward-looking  based on the Company's  expectations  and, as such,
these  statements  are subject to  uncertainty  and risk.  See "Factors That May
Affect Future Results" below.

RESULTS OF OPERATIONS

Twelve Months Ended August 31, 1999 compared with Twelve Months Ended August 31,
1998

Operating  results,  before  restructuring  and other charges and  extraordinary
items, are as follows ($ in millions):

<TABLE>
<CAPTION>
                                                             Twelve Months Ended August 31
                                                             -----------------------------
                                                               1999                1998
                                                        -------------------------------------
<S>                                                     <C>        <C>      <C>        <C>
Revenue .............................................   $1,685.9   100.0%   $1,185.5   100.0%
Operating expense ...................................    1,070.6    63.5%      797.4    67.3%
Depreciation and amortization .......................      136.0     8.1%       93.1     7.8%
Selling, general and administrative .................      134.5     8.0%      108.8     9.2%
                                                        --------   ------   --------   ------
Operating income before restructuring and other
charges and extraordinary items .....................   $  344.8    20.4%   $  186.2    15.7%
                                                        ========   =====    ========   ======
</TABLE>

Components of revenue are as follows ($ in millions):

<TABLE>
<CAPTION>
                                                             Twelve Months Ended August 31
                                                             -----------------------------
                                                                 1999              1998
                                                        -------------------------------------
<S>                                                     <C>          <C>    <C>          <C>
Collection and Recovery Services
    Industrial Services ............................    $  800.1     47%    $  585.3      50%
    Commercial and Institutional Services ..........       540.7     32%       227.7      19%
                                                        --------     ---    --------      ---
Total Collection and Recovery Services .............     1,340.8     79%       813.0      69%

Treatment and Disposal Services ....................       313.4     19%       324.6      27%

European Operations ................................        31.7      2%        47.9       4%
                                                        ---------   ----    --------      ---
     Total revenue .................................    $1,685.9    100%    $1,185.5     100%
                                                        ========    ====    ========     ====
</TABLE>

        Revenue  increased  $500.4 million,  or 42.2%,  during the twelve months
ended  August 31,  1999,  compared to the twelve  months  ended August 31, 1998.
Revenue from collection and recovery services to industrial  customers increased
$214.8 million,  or 36.7%,  while collection and recovery services to commercial
and  institutional  customers  increased  $313.0 million,  or 137.5%.  Increased
revenue from  collection  and recovery  services  reflects the  inclusion of the
acquired Old  Safety-Kleen  business  for the full twelve  months of the current
period. Revenue from treatment and disposal services decreased $11.2 million, or
3.5%,  primarily  due to a reduction  in the level of activity at the  Company's
harbor dredging and treatment  operations.  European operations  generated $31.7
million in the

                                       18
<PAGE>

three months  included in the current  period  compared to $47.9 million for the
five months included in the prior fiscal year, a decrease of $16.2 million.

        The Company eliminates  inter-company revenue in presenting consolidated
financial  results.  The majority of such  eliminations  occur at the  Company's
disposal  facilities  which receive waste streams from the Company's  collection
and recovery services network.

        Management's  estimate of the components of the changes in the Company's
consolidated revenue is as follows:

                                                  Percentage Increase (Decrease)
                                                  Twelve Months Ended August 31

                                                          1999 over 1998
                                                          --------------
Expansion of customer base by acquisition                     46.8%
Other, primarily through volume and price changes              1.5%
Divestitures and closures                                     (5.3%)
Foreign exchange rate changes                                 (0.8%)
                                                              ------
     Total                                                    42.2%

        The  comparative  increase in revenue for the twelve months ended August
31, 1999,  was primarily due to the inclusion of a full twelve  month's  results
for the acquired North  American  operations of Old  Safety-Kleen.  Revenue from
existing  operations  was  impacted by a  significant  reduction in the level of
activity in the Company's  harbor dredging and treatment  operations  within the
treatment and disposal component. Prior year revenue included contributions from
a thermal  treatment  facility which was closed on August 31, 1998, and from the
Company's  European  operations  which were  partially  divested on December 23,
1998, and deconsolidated  effective December 1, 1998. A reduction in revenue due
to  foreign  exchange  rate  changes  resulted  from a  relative  decline in the
Canadian dollar translation rate.

        While previously  expecting to achieve internal revenue growth of 10% by
the  end  of  fiscal  1999,  the  Company  now  expects  to  achieve  growth  of
approximately  7% during fiscal 2000 primarily as a result of market share gains
in the industrial services component,  the introduction of new services, and, to
a lesser  extent,  price  increases.  During the fourth fiscal quarter of fiscal
1999, the price and volume increase over the prior year, excluding the Company's
harbor dredging and treatment operations, was 5.0%.

Operating Expenses

        Operating expenses increased $273.2 million, or 34.3%, during the twelve
months  ended August 31,  1999,  compared to the twelve  months ended August 31,
1998. The increase was primarily attributable to additional business obtained as
part  of the  acquisition  of Old  Safety-Kleen.  As a  percentage  of  revenue,
operating expense decreased to 63.5% from 67.3% in the prior year, primarily due
to the  increased  utilization  of  existing  facilities  and other  operational
assets, acquisition related cost reduction measures, primarily personnel related
costs, and an increase in higher margin business. The Company estimates that the
vast  majority  of  available  cost  reduction  measures   associated  with  the
acquisition  of Old  Safety-Kleen  has been  achieved  by the fourth  quarter of
fiscal 1999,  during which operating  expenses totaled 62.4% of revenue and that
operating  expenses during fiscal 2000 will approximate a similar  percentage of
revenue.

Depreciation and Amortization Expense

        Depreciation and amortization expense increased $42.9 million, or 46.1%,
during the twelve months ended August 31, 1999,  compared to the prior year. The
increase related to the acquired operations of Old Safety-Kleen. As a percentage
of revenue,  depreciation and amortization expense was 8.1%, compared to 7.8% in
the  prior  year.   The  increase  as  a  percentage  of  revenue  is  primarily
attributable to the full year's inclusion of the amortization of excess purchase
price related to the acquisition of Old Safety-Kleen.


                                       19
<PAGE>

Selling, General and Administrative Expenses

        Selling, general and administrative expenses increased $25.7 million, or
23.6%, during the twelve months ended August 31, 1999, versus the prior year. As
a percentage of revenue,  selling, general and administrative expenses decreased
to 8.0% from 9.2% in the prior year due to cost reduction measures and economies
of scale  gained  through  the  acquisition  of Old  Safety-Kleen.  The  Company
estimates that, as a percentage of revenue,  costs for the year ended August 31,
1999, will be representative of those to be incurred in fiscal 2000.

Interest Expense

        Interest expense  increased $64.3 million,  or 59.7%,  during the twelve
months ended August 31, 1999,  over the prior year as a result of the additional
long term debt incurred to finance the acquisition of Old Safety-Kleen.

        Based on existing market conditions, the Company's average interest rate
is  approximately  8.25% of which 60% was fixed at August 31, 1999.  The Company
capitalized $4.1 million of interest costs during the year.

Equity in Earnings of Associated Companies

        On December  23,  1998,  the Company sold a 56% interest in its European
operations.  This transaction  resulted in no gain or loss. The Company accounts
for its  remaining  interest in the European  operations  on an equity basis and
intends  to  permanently  reinvest  its share of the  earnings  of the  European
operations.

Income Tax Expense

        The effective tax rate of 44% on income before  restructuring  and other
charges,  equity earnings,  and taxes ($178.6  million),  has increased over the
prior  year  effective  rate  due to the sale of 56% of the  Company's  European
operations and a full year's impact of the non-deductible  goodwill amortization
related to the acquisition of Old Safety-Kleen.  The European  operations had an
effective tax rate below that of the overall Company average.

Extraordinary Loss

        On August 27, 1999, as a result of the  repurchase  of the  subordinated
convertible  debenture,  the Company recognized an extraordinary charge of $15.0
million,  or $0.13 per share on a diluted  basis,  related to the write-off of a
deferred tax asset associated with the debenture.

RESULTS OF OPERATIONS

Twelve Months Ended August 31, 1998 compared with Twelve Months Ended August 31,
1997

Operating  results,  before  restructuring  and other charges and  extraordinary
items, are as follows ($ in millions):

<TABLE>
<CAPTION>

                                                            Twelve Months Ended August 31
                                                            -----------------------------
                                                               1998                1997
                                                        -------------------------------------
<S>                                                     <C>        <C>      <C>        <C>
Revenue ............................................    $1,185.5   100.0%   $678.6     100.0%
Operating expense ..................................       797.4    67.3%    485.1      71.5%
Depreciation and amortization ......................        93.1     7.8%     53.5       7.9%
Selling, general and administrative ................       108.8     9.2%     73.1      10.7%
                                                        --------   -----    ------     ------
Operating income before restructuring and other
charges and extraordinary items ....................    $  186.2    15.7%   $ 66.9       9.9%
                                                        ========   ======   ======     ======
</TABLE>


                                       20
<PAGE>

Components of revenue are as follows ($ in millions):

<TABLE>
<CAPTION>

                                                          Twelve Months Ended August 31
                                                          -----------------------------
                                                               1998                1997
                                                        -------------------------------------
Collection and Recovery Services
<S>                                                     <C>        <C>      <C>          <C>

    Industrial Services ................................$  585.3    50%     $  394.1      58%
    Commercial and Institutional Services ..............   227.7    19%        0.0         0%
                                                        --------     ---      ------     ----
Total Collection and Recovery Services .................   813.0    69%        394.1      58%

Treatment and Disposal Services ........................   324.6    27%        284.5      42%

European Operations ....................................    47.9     4%          0.0       0%
                                                         -------   ----       ------     ----
     Total revenue .....................................$1,185.5    100%    $  678.6     100%
                                                        ========    ====    ========     ====
</TABLE>


        Revenue increased $506.9 million, or 74.7%, during the fiscal year ended
August 31, 1998, compared to the fiscal year ended August 31, 1997. Revenue from
collection  and  recovery  services to  industrial  customers  increased  $191.2
million,  or 48.5%,  while the addition of collection  and recovery  services to
commercial and institutional  customers  generated an additional $227.7 million.
Increased  revenue  from  industrial  services  reflects  the  inclusion  of the
acquired  Old  Safety-Kleen  and Rollins  businesses  while the  commercial  and
institutional   component  reflects  business  acquired  with  Old  Safety-Kleen
exclusively.  Revenue from  treatment  and  disposal  services  increased  $40.1
million,  or 14.1%,  primarily due to the acquired  Rollins  business as well as
increased  harbor  related  dredging,  treatment  and disposal  activities.  The
acquired  European  operations of Old Safety-Kleen  provided an additional $47.9
million in revenue.

        The Company eliminates  inter-company revenue in presenting consolidated
financial  results.  The majority of such  eliminations  occur at the  Company's
disposal  facilities  which receive waste streams from the Company's  collection
and recovery services network.

        Management's  estimate of the components of the changes in the Company's
consolidated revenue is as follows:

                                                  Percentage Increase (Decrease)
                                                  Twelve Months Ended August 31,

                                                          1998 over 1997
                                                          --------------
Expansion of customer base by acquisition                     80.4%
Other, primarily through volume and price changes              3.0%
Divestitures and closures                                     (7.9%)
Foreign exchange rate changes                                 (0.8%)
                                                              ------
     Total                                                    74.7%
                                                              =====
        The comparative increase in revenue for the fiscal year ended August 31,
1998 was  primarily  due to the  inclusion  of the  acquired  operations  of Old
Safety-Kleen  from  April 1, 1998,  and the  inclusion  of Rollins  for the full
fiscal year  compared to its  inclusion as of May 15,  1997,  in the prior year.
Revenue from existing  operations grew as a result of increased  activity at the
Company's harbor-related  dredging,  treatment and placement operations but were
partially offset by reduced volumes at certain hazardous waste landfills.  Prior
year revenue included contributions from an industrial and municipal solid waste
landfill  which was divested on December 18, 1997. A reduction in revenue due to
foreign  exchange rate changes  resulted from a relative decline in the Canadian
dollar translation rate.

Operating Expenses

        Operating expenses increased $312.3 million, or 64.4%, during the fiscal
year ended August 31,  1998,  compared to the fiscal year ended August 31, 1997.
The increase was primarily  attributable to additional business obtained as part
of the acquisitions of Old Safety-Kleen and Rollins. As a percentage of revenue,
operating expense

                                       21
<PAGE>

decreased  to 67.3% from 71.5% in the prior year,  primarily  due to  stabilized
pricing,  the  increased  utilization  of existing  facilities  and  acquisition
related cost reduction measures.

Depreciation and Amortization Expense

        Depreciation and amortization expense increased $39.6 million, or 74.0%,
during the fiscal year ended  August 31, 1998,  compared to the prior year.  The
increase related to the acquired  operations of Old Safety-Kleen and Rollins. As
a percentage of revenue,  depreciation and  amortization  expense was relatively
unchanged at 7.8% compared to 7.9% in the prior year.

Selling, General and Administrative Expenses

        Selling, general and administrative expenses increased $35.7 million, or
48.8%, during the fiscal year ended August 31, 1998, compared to the prior year.
As a  percentage  of  revenue,  selling,  general  and  administrative  expenses
decreased to 9.2%, from 10.7% in the prior year, due to cost reduction  measures
and economies of scale gained through the Safety-Kleen and Rollins Acquisitions.

Restructuring and Other Charges

        A one-time  restructuring  charge of $65.8 million  ($39.5 million after
tax, or $0.12 per share on a diluted  basis)  impacted  earnings  for the twelve
months ended August 31, 1998. The charge included the costs  associated with the
closing and  remediation of certain of the existing  operating  facilities  that
have become  redundant and other exit activities as a result of the Safety-Kleen
Acquisition.  $31.8 million of the charge  related to the non-cash  write-off of
existing facility carrying values,  and $34.0 million  represented cash costs to
be expended during subsequent periods.

        In fiscal 1997, the Company  recorded a  restructuring  charge of $331.7
million ($200.0 million after tax) related to the Rollins Acquisition,  of which
the expected cash costs were $25 million.

Interest Expense

         Interest expense increased $63.4 million, or 143.3%,  during the fiscal
year ended  August 31,  1998 over the prior year,  primarily  as a result of the
recapitalizations related to the Safety-Kleen and Rollins Acquisitions. Prior to
May 15,  1997,  interest  expense  was  allocated  from the parent  corporation,
Laidlaw Inc.

Income Tax Expense

        Prior to May 15, 1997,  income tax expense was allocated from the parent
corporation  using  applicable  income tax rates on income for tax purposes on a
separate return basis.  Effective May 15, 1997, the Company began filing federal
and state income tax returns separately.

Extraordinary Loss

        In April 1998,  the Company  replaced its existing Bank Credit  Facility
with a Senior Credit  Facility and recognized an  extraordinary  charge of $18.8
million  ($11.3 million after tax or $0.13 per share on a diluted basis) related
to the  write-off  of  previous  deferred  debt  issuance  costs  and  repayment
penalties.

ENVIRONMENTAL LIABILITIES

        Note 9 to the Consolidated Financial Statements includes a continuity of
the Company's environmental liabilities for the two years ended August 31, 1999.

        During fiscal 1999, the Company  charged  against  earnings $1.4 million
for closure and post-closure costs at open landfill  facilities and $3.6 million
for remediation  costs at open facilities.  The closure and  post-closure  costs
relate to  consumed  airspace,  based on waste  receipts  during  the year.  The
remediation  costs  relate  to  ongoing  monitoring  activities.  There  were no
significant amounts charged against earnings related to closed facilities.

                                       22
<PAGE>

        In addition,  the Company  reevaluated the costs associated with closing
and  remediating  facilities  identified  for  closure  in  connection  with the
acquisition of Old Safety-Kleen and identified  additional LESI facilities to be
closed. As outlined in Note 12 to the Consolidated Financial Statements, a $14.2
million reduction in previously recorded environmental  liabilities was recorded
relating to the LESI facilities identified for closure in fiscal 1998 and a $2.8
million  increase  was  required to be  recorded  relating  to  additional  LESI
facilities  identified  for closure in connection  with the  acquisition  of Old
Safety-Kleen.

        During fiscal 1999,  the Company  reduced  environmental  liabilities by
$1.9 million due to changes in foreign exchange rates.

        In fiscal 1998, the Company  charged  against  earnings $0.5 million for
closure and post-closure costs at open landfill  facilities and $2.9 million for
remediation costs at open facilities.

EARNINGS PER SHARE

        Basic  earnings  per share  ("EPS") for fiscal 1999 of $1.00 on reported
net income of $89.0 million,  comprises a $0.17 loss for the extraordinary  item
and $1.17 for income from  continuing  operations.  Diluted EPS from  continuing
operations before the extraordinary item were $1.03.

FACTORS THAT MAY AFFECT FUTURE RESULTS

        This  report  contains  various  forward-looking  statements  within the
meaning of the  Private  Securities  Litigation  Reform  Act of 1995,  including
financial,  operating  and  other  projections.  These  statements  are based on
current   plans  and   expectations   of  the  Company  and  involve  risks  and
uncertainties   that  could  cause  actual  future  activities  and  results  of
operations   to  be   materially   different   from   those  set  forth  in  the
forward-looking statements.

        Important  factors  that could cause actual  results to differ  include,
among others, risks associated with acquisitions and achieving the targeted cost
savings  levels,  fluctuations  in operating  results  because of  acquisitions,
changes in applicable  government  regulations  (environmental  and other),  the
impact of litigation,  competition and risks  associated with the operations and
growth of the newly  acquired  business of Old  Safety-Kleen  and other  factors
described  in Part I, Item 1 of this  Annual  Report on Form 10-K for the Twelve
Months  Ended  August 31,  1999.  As a result of these  factors,  the  Company's
revenue and income could vary  significantly  from quarter to quarter,  and past
financial  performance  should not be considered a reliable  indicator of future
performance.

CAPITALIZATION

        On November 24, 1998, the Company's shareholders approved a one-for-four
reverse stock split which became  effective at the close of business on November
30, 1998. As a result,  shareholders  received one share of Safety-Kleen  common
stock for each four shares previously held.

        On November  15,  1998,  the Company  issued  635,208  shares to satisfy
interest due on the subordinated convertible debenture.

        On May 17, 1999, the Company  issued 533,333 shares to satisfy  interest
due on the subordinated convertible debenture.

        On May 17, 1999,  the Company issued $225 million 9.25% Senior Notes due
2009 (the "Senior Notes") in a private  offering.  Net proceeds from the sale of
the Senior  Notes,  after the  underwriting  discount and other  expenses,  were
approximately  $214  million.  The net  proceeds  were used to finance  the cash
portion of the purchase price for the repurchase of the subordinated convertible
debenture (the  "Repurchase").  The purchase  price also included  approximately
11.3 million common shares of the Company. The issuance of the common shares was
approved at a Special  Meeting of the  stockholders of the Company on August 27,
1999.

        On August  27,  1999,  the  Company  issued  376,858  shares to  satisfy
interest  due,  through  the  date  of  the  repurchase,   on  the  subordinated
convertible debenture.

                                       23
<PAGE>

LIQUIDITY

        Total cash provided by operations  during the twelve months ended August
31, 1999 was $70.1 million. This was comprised of $312.1 million from operations
before  financing  working  capital  requirements  of $154.1  million  and $87.9
million related to spending on acquisition liabilities.

        On December 23, 1998, the Company announced the  recapitalization of its
European  operations  resulting  in the  sale  of 56%  of the  Company's  equity
interest in that entity.  As a result of the  recapitalization  the Company will
receive gross proceeds of $154.0 million.  During the twelve months ended August
31, 1999, the Company received $140.4 million of net proceeds (net of $5 million
cash left in the European  operations  at the time of sale).  The balance of the
gross proceeds will be received as a dividend tax refund.

        The  Company's   primary  sources  of  liquidity  are  cash  flows  from
operations,  existing cash and short-term  investments of $9.2 million,  and the
unused cash portion of the Senior  Credit  Facility's  revolver  tranche of $299
million.

        Trade and other  accounts  receivable  represent the largest  portion of
current  assets,  totaling  $395.0  million at August 31, 1999. The average days
sales outstanding ("DSO") increased to 82 days, from 66 days at August 31, 1998.
The DSO increase and the related  increase in working capital was due to billing
and collections systems integration and modifications.  The Company expects days
sales  outstanding  to decrease in fiscal 2000 as these  integration  issues are
resolved and as systems modifications become complete.

        The Company  expects to fund capital  expenditures,  debt  repayment and
environmental liability requirements from cash flows from operations.

        The Company has not paid dividends during the reported periods, and does
not intend to pay dividends in the foreseeable future. Additionally,  the Senior
Credit Facility prohibits the payment of dividends (unless a given percentage of
lenders otherwise agree).

        The Company has charged cash  expenditures  of $31.2 million against the
Safety-Kleen and Rollins  restructuring  reserves during Fiscal 1999,  leaving a
balance  of $13.0  million  for which cash  expenditures  related  primarily  to
environmental accruals will be expended in subsequent periods.

CAPITAL EXPENDITURES AND CAPITAL RESOURCES

        Investing  activities  for the twelve  months  ended  August  31,  1999,
generated  cash of $59.4  million.  Net  expenditures  for the purchase of fixed
assets for normal replacement  requirements and increases in services were $66.3
million and net proceeds  from the sale of the European  operations  were $140.4
million.  The  Company's  projected  capital  expenditures  for fiscal  2000 are
approximately  $75 to $80  million.  The Company  believes  that it has adequate
resources to finance these expenditures.

        The Company's Senior Credit Facility contains negative,  affirmative and
financial  covenants  customarily  found in  credit  agreements  for  financings
similar to the financing  provided under the Senior Credit  Facility,  including
covenants limiting annual capital  expenditures,  restricting debt,  guaranties,
liens, mergers and consolidations, sales of assets and payment of dividends. The
Company was in compliance with all of its covenants at August 31, 1999.

        The Company's 1999 Notes are  effectively  subordinated to the Company's
subsidiaries'  indebtedness.  The 1998 Notes  restrict the payment of dividends,
advances or other distributions from the Company's  subsidiaries to the Company,
as may be required to service the Senior  Notes,  may be  restricted as they are
subject  to the  various  indentures,  covenants  and other  obligations  of the
subsidiaries.

                                       24
<PAGE>

INFLATION

        During the periods presented herein, the Company's business has not been
and is not  expected  in the  near  future  to  be,  significantly  affected  by
inflation.

YEAR 2000 READINESS DISCLOSURE

        The Year 2000 ("Y2K") issue is the result of computer  programs  using a
two-digit format, as opposed to four digits, to indicate the year. Such computer
programs  will be unable to interpret  dates  beyond the year 1999,  which could
cause a system  failure or other  computer  errors,  leading to  disruptions  in
operations.  The  Company  developed  a  three-phase  program  for  Y2K  systems
compliance.  Phase I identified  those systems with respect to which the Company
had exposure to Y2K issues.  Phase II was the development and  implementation of
action  plans  for  Y2K  compliance.  Phase  III was the  final  testing  of the
appropriate major areas of exposure to ensure compliance.

        Phase I was completed  early in fiscal 1998 and  identified  three major
areas of Y2K non-compliance:

        (1)  certain modules of our financial and operational systems,
        (2)  incinerator distributed control systems, and
        (3)  third-party vendor relationships.

        The  Phase II  action  plans  have been  developed  with  implementation
completed  during  the  second  calendar  quarter  of  1999.  Our  plan to bring
deficient  financial  systems into compliance  through the previously  scheduled
purchase of software  upgrades has been  accomplished,  and these  upgrades have
tested   satisfactorily.   Remediation  of  the  operational  systems  has  been
accomplished through a combination of hardware and software upgrades and program
changes.  The deficiencies in the incinerator  distributed  control systems have
been  remedied  by the  installation  of  upgrades  purchased  from the  systems
vendors.  With respect to the third-party vendors, we have contacted most of our
major suppliers and have received  indications that they are either compliant or
intend to be compliant by mid-calendar year 1999.

        In fiscal 1999,  the Company  incurred  approximately  $7.25  million of
costs in connection  with its Y2K compliance  efforts ($1.4 million was incurred
in fiscal 1998).  $5.0 million related to software  upgrades and program changes
to certain  modules of the Company's  financial and  operational  systems,  $1.0
million  related to upgrades to network  operations  equipment and $1.25 million
related to software upgrades to the incinerator distributed control systems.

        Phase III  testing,  to ensure  compliance  once the Phase II plans were
implemented,  was  successfully  completed during the second calendar quarter of
1999. As all three phases have now been completed, the Company is in the process
of developing worst case contingency plans. To the extent we experience material
Y2K problems and do not have any  contingency  plan in effect for remedying such
problems,  such Y2K problems could have a material adverse effect on our results
of operations, financial conditions and cash flow.

        While we believe  the  occurrence  of such a  scenario  is  unlikely,  a
possible  worst case scenario  might include (a) delays,  inaccuracies  or other
difficulties  with respect to billing customers or the loss of customer records,
(b)  our  inability  to  run  one  or  more  of our  incinerators  or  recycling
facilities, (c) our key vendors not being able to supply goods and services on a
timely  basis,  and (d) the  inability  of our  customers  to remit  payment for
services  rendered on a timely basis.  The financial impact of any or all of the
above worst case  scenarios  has not been and cannot be estimated by  management
due to the numerous uncertainties and variables associated with such scenarios.

RECENT ACCOUNTING DEVELOPMENTS

        In June 1998, FASB issued  Statement No. 133,  "Accounting of Derivative
Instruments  and Hedging  Activities,"  ("SFAS  133"),  and amended by SFAS 137,
effective  for  periods  beginning  after June 15,  2000.  SFAS 133  establishes
accounting and reporting standards for derivative instruments, including certain
derivative  instruments  embedded on other  contracts,  and derivatives used for
hedging  purposes.  SFAS 133 requires  that

                                       25
<PAGE>

entities  recognize all  derivative  financial  instruments  as either assets or
liabilities on the balance sheet at their fair value.  Changes in the fair value
of the  derivatives  are  recorded  each  period in  current  earnings  or other
comprehensive income, depending on whether a derivative is designated as part of
a hedge transaction,  and if it is, the type of hedge  transaction.  The Company
anticipates  that the  adoption  of this  standard  will not have a  significant
effect on the Company's results of operations or its financial position.

        In March 1998, the AICPA issued Statement of Position 98-1.  "Accounting
for Costs of Computer  Software for Internal  Use," ("SOP 98-1"),  effective for
periods  beginning  after  December  15,  1998.  SOP 98-1  provides  guidance on
defining  internal use software and the accounting  for the costs  thereof.  The
Company  anticipates  that  the  adoption  of this  statement  will  not  have a
significant  effect on the  Company's  results of  operations  or its  financial
position.

        In April 1998, the AICPA issued Statement of Position 98-5,  "Accounting
for the Costs of  Start-Up  Activities,"  (SOP  98-5"),  effective  for  periods
beginning  after  December  15,  1998.  SOP 98-5  requires all costs of start-up
activities to be expensed as incurred.  Start-up activities are defined as those
one-time activities related to opening a new facility, introducing a new product
or service,  conducting business in a new territory,  conducting business with a
new class of customer or  beneficiary,  initiating  a new process in an existing
facility,  or  commencing  a new  operation.  Activities  related  to mergers or
acquisitions are not considered  start-up  activities and,  therefore,  SOP 98-5
does not change the accounting for such items. The Company  anticipates that the
adoption of this statement  will not have a significant  effect on the Company's
results of operations or its financial position.

ITEM 7A.   QUANTITATIVE AND QUALITATIVE DISCLOSURE ABOUT MARKET RISK

        The Company has no material information to disclose.

                                       26
<PAGE>

ITEM 8.   FINANCIAL STATEMENTS AND SUPPLEMENTARY DATA
<TABLE>
<CAPTION>

                   Index to Consolidated Financial Statements
<S>                                                                                              <C>

Report of Independent Accountants................................................................28

Consolidated Statements of Income for the Years Ended August 31, 1999, 1998  and 1997............29

Consolidated Statements of Comprehensive Income for the Years Ended August 31, 1999, 1998
and 1997.........................................................................................29

Consolidated Balance Sheets as of August 31, 1999 and 1998.......................................30

Consolidated Statements of Cash Flows for the Years Ended August 31, 1999, 1998 and 1997.........31

Consolidated Statements of Stockholders' Equity for the Years Ended August 31, 1999, 1998
and 1997.........................................................................................32

Notes to Consolidated Financial Statements.......................................................33
</TABLE>


                                       27
<PAGE>

                        REPORT OF INDEPENDENT ACCOUNTANTS

To the Stockholders and Directors of Safety-Kleen Corp.

In our opinion,  the  accompanying  consolidated  balance sheets and the related
consolidated  statements  of  income,   comprehensive  income,  cash  flows  and
stockholders'  equity present fairly,  in all material  respects,  the financial
position of Safety-Kleen Corp. and its subsidiaries at August 31, 1999 and 1998,
and the results of their  operations  and their cash flows for each of the three
years in the period ended August 31, 1999, in conformity with generally accepted
accounting principles.  These financial statements are the responsibility of the
Company's  management;  our  responsibility  is to  express  an opinion on these
financial  statements  based on our  audits.  We  conducted  our audits of these
statements in accordance  with  generally  accepted  auditing  standards,  which
require that we plan and perform the audit to obtain reasonable  assurance about
whether the financial  statements  are free of material  misstatement.  An audit
includes  examining,  on a test  basis,  evidence  supporting  the  amounts  and
disclosures in the financial  statements,  assessing the  accounting  principles
used and  significant  estimates made by management,  and evaluating the overall
financial  statement  presentation.   We  believe  that  our  audits  provide  a
reasonable basis for the opinion expressed above.

/s/ProcewaterhouseCoopers LLP

Charlotte, North Carolina
October 5, 1999



                                       28
<PAGE>
                              SAFETY-KLEEN CORP.
                        CONSOLIDATED STATEMENTS OF INCOME
                   ($ in thousands, except per share amounts)
<TABLE>
<CAPTION>
                                                                 Year Ended August 31
                                                                 --------------------
                                                           1999          1998           1997
                                                           ----          ----           ----
<S>                                                  <C>            <C>            <C>
Revenue ..........................................   $ 1,685,948    $ 1,185,473    $   678,619
                                                     -----------    -----------    -----------
Expenses:
  Operating ......................................     1,070,666        797,382        485,062
  Depreciation and amortization ..................       136,002         93,051         53,506
  Selling, general and administrative ............       134,497        108,817         73,068
  Restructuring and other charges ................          --           65,831        331,697
                                                     -----------    -----------    -----------
    Total expenses ...............................     1,341,165      1,065,081        943,333
                                                     -----------    -----------    -----------
Operating income (loss) ..........................       344,783        120,392       (264,714)
Interest expense .................................       172,028        107,697         44,273
Other income .....................................         5,803          7,657          2,865
Equity in earnings of associated company .........         2,708           --             --
                                                     -----------    -----------    -----------
Income (loss) from continuing operations
  before income tax expense (benefit) ............       181,266         20,352       (306,122)
Income tax expense (benefit) .....................        78,565          9,133       (122,789)
                                                     -----------    -----------    -----------
Income (loss) from continuing operations
  before minority interest .......................       102,701         11,219       (183,333)
Minority interest, net of tax ....................         1,211            269           (119)
                                                     -----------    -----------    -----------
Income (loss) from continuing operations .........       103,912         11,488       (183,452)
Income from discontinued operations, net of tax ..          --             --               20
                                                     -----------    -----------    -----------
Income (loss) before extraordinary item ..........       103,912         11,488       (183,432)
Extraordinary loss, net of tax of $7,494 in 1998 .       (15,036)       (11,283)          --
                                                     -----------    -----------    -----------
Net income (loss) ................................   $    88,876    $       205    $  (183,432)
                                                     ===========    ===========    ===========
Basic income (loss) per share:
  Income (loss) from continuing operations .......   $      1.17    $      0.18    $     (5.32)
  Extraordinary loss, net of tax .................         (0.17)         (0.18)          --
                                                     -----------    -----------    -----------
  Net income (loss) ..............................   $      1.00    $      --      $     (5.32)
                                                     ===========    ===========    ===========
  Weighted average common stock outstanding (000s)        88,537         62,322         34,508
                                                     ===========    ===========    ===========
Diluted income (loss) per share:
  Income (loss) from continuing operations .......   $      1.03    $      0.18    $     (5.32)
  Extraordinary loss, net of tax .................         (0.13)         (0.18)          --
                                                     -----------    -----------    -----------
  Net income (loss) ..............................   $      0.90    $      --      $     (5.32)
                                                     ===========    ===========    ===========
  Weighted average common stock outstanding
    and assumed conversions (000s) ...............       111,645         62,322         34,508
                                                     ===========    ===========    ===========
</TABLE>
                 See accompanying Notes to Consolidated Financial Statements

                               SAFETY-KLEEN CORP.
                 CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME
                                ($ in thousands)
<TABLE>
<CAPTION>

                                                                 Year Ended August 31
                                                                 --------------------
                                                           1999        1998         1997
                                                           ----        ----         ----
<S>                                                     <C>         <C>          <C>

Net income (loss) ...................................   $  88,876   $     205    $(183,432)
Other comprehensive income (loss):
  Unrealized foreign currency translation adjustments       5,879     (18,122)        (706)
                                                        ---------   ---------    ---------
Comprehensive income (loss) .........................   $  94,755   $ (17,917)   $(184,138)
                                                        =========   =========    =========
</TABLE>

                 See accompanying Notes to Consolidated Financial Statements


                                       29
<PAGE>

                               SAFETY-KLEEN CORP.

                           CONSOLIDATED BALANCE SHEETS

                                ($ in thousands)

                                                               August 31
                                                               ---------
                                                         1999          1998
                                                         ----          ----
ASSETS

Current assets

  Cash and cash equivalents .......................  $     9,173    $    16,333
  Accounts receivable .............................      395,009        320,048
  Inventories and supplies ........................       60,567         53,759
  Income taxes recoverable ........................         --           37,495
  Deferred income taxes ...........................       58,641         69,426
  Other current assets ............................       64,307         45,273
                                                     -----------    -----------
    Total current assets ..........................      587,697        542,334
                                                     -----------    -----------
Long-term investments .............................       76,739         35,926
                                                     -----------    -----------
Property, plant and equipment
  Land, landfill sites and improvements ...........      507,404        504,308
  Buildings .......................................    1,012,660      1,115,137
  Machinery and equipment .........................    1,412,988      1,495,643
  Leasehold improvements ..........................       23,788         32,815
  Construction in process .........................       28,200         14,965
                                                     -----------    -----------
    Property, plant and equipment .................    2,985,040      3,162,868
    Less, accumulated depreciation and amortization     (413,020)      (312,366)
                                                     -----------    -----------
      Property, plant and equipment, net ..........    2,572,020      2,850,502
Goodwill, at cost (net of accumulated amortization
  of $39,538 in 1999; $13,268 in 1998) ............    1,098,731      1,023,154
Other assets ......................................       31,617         16,979
                                                     -----------    -----------
  Total assets ....................................  $ 4,366,804    $ 4,468,895
                                                     ===========    ===========

LIABILITIES

Current liabilities

  Accounts payable ................................  $   172,838    $   128,560
  Accrued liabilities .............................      163,818        219,352
  Current portion of long-term debt ...............       85,063         77,004
                                                     -----------    -----------
    Total current liabilities .....................      421,719        424,916
Environmental and other long-term liabilities            224,090        259,459
Long-term debt ....................................    1,882,371      1,853,164
Subordinated convertible debenture ................         --          350,000
Deferred income taxes .............................      556,372        566,650
                                                     -----------    -----------
  Total liabilities ...............................    3,084,552      3,454,189
                                                     -----------    -----------

Commitments and contingencies .....................         --           --
                                                     -----------    -----------

STOCKHOLDERS' EQUITY

  Common stock, par value $1.00 per share;
  authorized 250,000,000; issued and outstanding
  100,635,975 - 1999; 87,746,243 - 1998............      100,636         87,746
Additional paid-in capital ........................    1,342,448      1,182,547
Accumulated other comprehensive loss ..............      (12,949)       (18,828)
Accumulated deficit ...............................     (147,883)      (236,759)
                                                     -----------    -----------
  Total stockholders' equity ......................    1,282,252      1,014,706
                                                     -----------    -----------
  Total liabilities and stockholders' equity ......  $ 4,366,804    $ 4,468,895
                                                     ===========    ===========

          See accompanying Notes to Consolidated Financial Statements

                                       30
<PAGE>

                             SAFETY-KLEEN CORP.
                      CONSOLIDATED STATEMENTS OF CASH FLOWS
                                ($ in thousands)
<TABLE>
<CAPTION>
                                                                 Year Ended August 31
                                                                 --------------------
                                                            1999           1998          1997
                                                            ----           ----          ----
Cash flows from operating activities:
<S>                                                     <C>            <C>            <C>
  Net income (loss) .................................   $    88,876    $       205    $  (183,432)
  Adjustments to reconcile net income (loss) to net
   cash provided by continuing operations:

     Income from discontinued operations ............          --             --              (20)
     Extraordinary loss, net of applicable income tax        15,036         11,283           --
     Restructuring and other charges, net of
      Applicable income tax .........................          --           39,499        200,000
     Depreciation and amortization ..................       136,002         93,051         53,506
     Deferred income taxes ..........................        64,038         21,681         37,507
     Equity in undistributed earnings of associated
     companies ......................................        (2,708)          --             --
     Change in accounts receivable ..................       (92,263)         7,902         (8,151)
     Change in accounts payable and accrued and
      other long-term liabilities ...................       (41,816)       (34,955)       (52,632)
     Decrease in liabilities assumed upon acquisition       (87,964)       (40,922)       (17,945)
     Change in other, net ...........................        (9,143)       (10,117)         8,126
                                                        -----------    -----------    -----------
Net cash provided by continuing operations ..........        70,058         87,627         36,959
Net cash provided by discontinued operations ........          --             --              425
                                                        -----------    -----------    -----------
Net cash provided by operating activities ...........        70,058         87,627         37,384
                                                        -----------    -----------    -----------
Cash flows from investing activities:
  Cash acquired (expended) on acquisition of
  businesses ........................................       (10,911)    (1,281,495)        15,451
  Purchase of property, plant and equipment .........       (73,593)       (50,754)       (36,097)
  Increase in long-term investments .................            (5)        (2,478)        (2,837)
  Proceeds from sales of property, plant and
  equipment .........................................         7,336         13,433          1,596
  Proceeds from sale of business ....................       140,401         33,675           --
  Change in other, net ..............................        (3,870)        (5,716)          --
                                                        -----------    -----------    -----------
Net cash provided by (used in) continuing operations         59,358     (1,293,335)       (21,887)
Net cash used in discontinued operations ............          --             --           (1,887)
                                                        -----------    -----------    -----------
Net cash provided by (used in) investing activities .        59,358     (1,293,335)       (23,774)
                                                        -----------    -----------    -----------
Cash flows from financing activities:
  Issuance of common stock upon exercise of
   stock options ....................................           212            509           --
  Borrowings of long-term debt ......................       225,000      1,856,814        451,622
  Repayments of long-term debt ......................      (385,294)      (604,684)       (61,542)
  Bank overdraft ....................................        36,396         12,992        (32,188)
  Bank financing fees and expenses ..................       (12,900)       (50,538)       (18,788)
  Payments to Laidlaw Inc. ..........................          --             --         (349,116)
  Advances from Laidlaw Inc. ........................          --             --            7,562
                                                        -----------    -----------    -----------
Net cash provided by (used in) financing activities .      (136,586)     1,215,093         (2,450)
                                                        -----------    -----------    -----------
Effect of exchange rate changes on cash .............            10         (4,212)          --
                                                        -----------    -----------    -----------
Net increase (decrease) in cash and cash equivalents         (7,160)         5,173         11,160
Cash and cash equivalents at:
  Beginning of period ...............................        16,333         11,160           --
                                                        -----------    -----------    -----------
  End of period .....................................   $     9,173    $    16,333    $    11,160
                                                        ===========    ===========    ===========
</TABLE>

                 See accompanying Notes to Consolidated Financial Statements

                                       31
<PAGE>

                              SAFETY-KLEEN CORP.
                 CONSOLIDATED STATEMENTS OF STOCKHOLDERS' EQUITY
                                ($ in thousands)
<TABLE>
<CAPTION>
                                                          Accumulated
                                            Additional      Other                           Total
                                 Common      Paid-in     Comprehensive   Accumulated     Stockholders'
                                 Stock       Capital         Loss          Deficit          Equity
                                  -----      -------         ----          -------          ------
<S>                            <C>          <C>           <C>            <C>              <C>

Balance at August 31, 1996 .   $  30,000    $1,118,309    $      --      $   (53,532)     $1,094,777
Net loss ...................         --            --            --         (183,432)       (183,432)
Net additional investment
  by Laidlaw Inc. ..........         --          7,562           --             --             7,562
Issuance of subordinated
  convertible debenture
  to Laidlaw Inc. ..........         --       (350,000)          --             --          (350,000)
Cash paid to Laidlaw Inc. ..         --       (349,116)          --             --          (349,116)
Issuance of additional
  shares on acquisition ....      15,094       150,940           --             --           166,034
Exercise of stock options ..          15           140           --             --               155
Transfer of subsidiary (See
  Note 14) to Laidlaw Inc. .         --        (57,309)          --             --           (57,309)
Cumulative foreign currency
  translation adjustment ...         --            --           (706)           --              (706)
                               ---------    ----------    ----------     -----------      -----------
Balance at August 31, 1997 .      45,109       520,526          (706)       (236,964)        327,965
Net income .................         --            --            --              205             205
Issuance of additional
  shares on acquisition ....      41,615       645,034           --             --           686,649
Exercise of stock options ..          42           467           --             --               509
Issuance of shares in
  payment for interest
  on subordinated
  convertible debenture ....         980        16,520           --             --            17,500
Cumulative foreign currency
  translation adjustment ...         --            --        (18,122)           --           (18,122)
                               ---------    ----------    ----------     -----------      -----------
Balance at August 31, 1998 .      87,746     1,182,547       (18,828)       (236,759)      1,014,706
Net income .................         --            --            --           88,876          88,876
Exercise of stock options ..          18           194           --             --               212
Issuance of shares in
  payment for directors'fees           6            87           --             --                93
Issuance of shares for
  repurchase of subordinated
  convertible debenture ....      11,321       138,679           --             --           150,000
Issuance of shares in
  payment for interest
  on subordinated
  convertible debenture ....       1,545        20,941           --             --            22,486
Cumulative foreign currency
  translation adjustment ...         --            --          5,879            --             5,879
                               ---------    ----------    -----------    -----------      -----------
Balance at August 31, 1999 .   $ 100,636    $1,342,448    $  (12,949)    $  (147,883)     $1,282,252
                               =========    ==========    ===========    ===========      ===========
</TABLE>

                 See accompanying Notes to Consolidated Financial Statements


                                       32
<PAGE>

                               SAFETY-KLEEN CORP.
                   NOTES TO CONSOLIDATED FINANCIAL STATEMENTS

1. SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES

        A  summary  of  the  significant  accounting  policies  followed  in the
preparation of these consolidated financial statements is as follows:

Consolidation and Presentation

         The  consolidated   financial   statements   include  the  accounts  of
Safety-Kleen Corp.  (formerly Laidlaw  Environmental  Services,  Inc. or "LESI")
(the   "Company")  and  all  of  its  subsidiary   companies.   All  significant
intercompany balances and transactions have been eliminated in consolidation.

        Prior period  shares issued and  outstanding,  weighted  average  common
stock  outstanding  and basic and diluted income per share have been restated to
reflect a one-for-four  reverse stock split which became  effective at the close
of business  November 30, 1998. In connection with the reverse stock split,  the
number of common  shares  available for issuance was reduced from 750 million to
250 million.

        Certain  reclassifications  have been made to the prior period financial
statements to conform to the current presentation. Such reclassifications had no
effect on results of operations.

Cash and Cash Equivalents

        Cash and cash  equivalents  consist of cash on deposit and term deposits
in investments with maturities of three months or less.

Inventories and Supplies

        Inventories  consist  primarily  of solvent,  oil and  supplies  and are
valued at the  lower of cost or  market,  determined  on a  first-in,  first-out
basis.

Long -Term Investments

        Long-term  investments,  which have been classified as held to maturity,
are carried at cost, which approximates fair market value, and consist primarily
of long-term trust fund deposits with government  authorities to support closure
and post-closure activities at several of the Company's facilities.

        Investments  in  associated  companies,   over  which  the  Company  has
significant  influence,  are accounted for by the equity method. Equity earnings
are recorded to the extent that any increase in the carrying value is determined
to be realizable. All earnings are considered to be permanently reinvested.

Property, Plant and Equipment

        Property,  plant and  equipment  is recorded at cost.  Expenditures  for
major renewals and improvements are capitalized.  Items of an ordinary repair or
maintenance  nature are  charged  directly  to  operating  expense.  The Company
capitalizes  environmentally  related  expenditures which extend the life of the
related property or mitigates or prevents future environmental contamination.

        Machinery  and  equipment  includes  the cost of  equipment  at customer
locations  having a net book value of $110.3  and  $103.3  million at August 31,
1999 and 1998, respectively. Depreciation commences when the units are placed in
service at the customer location.

        Landfill sites, preparation costs and improvements are recorded at cost,
which includes capitalized interest on landfill capacity under development,  and
amortized on the basis of landfill capacity  utilized during the year.  Landfill
capacity  represents  total permitted  airspace which is measured in the form of
cubic yards.

                                       33
<PAGE>

        During the  construction  and development  period of an asset, the costs
incurred, including applicable interest costs, are classified as construction in
process. Once an asset has been completed and put into use, it is transferred to
the appropriate category and depreciation commences.

        During fiscal 1999, 1998, and 1997, the Company capitalized  interest of
$4.1 million, $4.1 million, and $6.7 million, respectively.

        The cost of permits directly related to property, plant and equipment is
capitalized  with the related  asset and  depreciated  over the expected  permit
life.  Leasehold  improvements are capitalized and amortized over the shorter of
the  improvement  life or the  remaining  term of the  lease.  Depreciation  and
amortization of other property, plant and equipment is provided substantially on
a straight-line basis over the estimated useful lives which are as follows:

        Buildings - 20 to 40 years Machinery and equipment - 5 to 30 years.

         Depreciation  expense  was $107.8  million,  $78.1  million,  and $50.9
million in fiscal 1999, 1998 and 1997, respectively.

Goodwill

        Goodwill consists primarily of the cost of acquired businesses in excess
of market value of net assets acquired and is amortized on a straight-line basis
over  forty  years.   Goodwill  is  reviewed  for  impairment   when  events  or
circumstances  indicate  it may not be  recoverable.  If it is  determined  that
goodwill may be impaired and the estimated undiscounted future cash flows of the
underlying  business are less than the carrying amount of the goodwill,  then an
impairment  loss is recognized.  The impairment  loss is based on the difference
between the fair value of the underlying  business and the carrying amount.  The
method of  determining  fair value differs based on the nature of the underlying
business.  Goodwill  amortization expense was $28.2 million,  $12.5 million, and
$2.1 million in fiscal 1999, 1998, and 1997, respectively.

Impairment of Long-Lived Assets

        The Company  periodically  reviews the carrying  values of its property,
plant  and  equipment  and  goodwill  to  determine   whether  such  values  are
recoverable. Accordingly, when indicators of impairment are present, the Company
evaluates  the carrying  value of property,  plant and equipment and goodwill in
relation to the operating performance and the estimated future undiscounted cash
flows of the  underlying  business.  If a write-down  is  required,  the Company
adjusts  the book  value  of the  underlying  asset to fair  value of the sum of
expected future discounted cash flows.

Deferred Financing Costs

        Deferred financing costs are amortized over the life of the related debt
instrument and included in long-term debt.

Environmental Liabilities

        Environmental  liabilities  include  accruals  for the  estimated  costs
associated  with closure and  post-closure  monitoring  and  maintenance  of the
Company's  landfills,  remediation  at certain of the Company's  facilities  and
corrective actions at Superfund sites. The Company accrues for estimated closure
and  post-closure  costs  over  the life of the  landfill  site as  capacity  is
consumed.  In accordance with American Institute of Certified Public Accountants
Statement  of  Position  96-1  ("SOP  96-1"),  the  Company  accrues  for  costs
associated with  environmental  remediation  obligations on a site by site basis
when such costs are probable and  reasonably  estimable.  Accruals for estimated
costs of environmental remediation obligations generally are recognized no later
than completion of the remedial feasibility study. Such accruals are adjusted as
further  information  develops or  circumstances  change.  Changes in  estimated
closure and  post-closure  costs are recognized  over the remaining  asset life.
Costs  of  future  expenditures

                                       34
<PAGE>

for  closure,   post-closure  and  environmental   remediation  obligations  are
discounted  if the amount and timing of the cash  payments are fixed or reliably
determinable.

Financial Instruments

        The Company's cash and cash equivalents,  accounts  receivable,  certain
long-term  investments,  accounts payable,  long-term debt, and the subordinated
convertible debenture constitute financial instruments.  Concentration of credit
risks in accounts  receivable  are limited due to the large  number of customers
comprising the Company's  customer base  throughout  North America.  The Company
performs  ongoing  credit  evaluations  of its  customers,  but does not require
collateral to support trade  accounts  receivable.  The Company  establishes  an
allowance  for  doubtful  accounts  based  on  the  credit  risk  applicable  to
particular customers, historical trends and other relevant information.

Derivative Financial Instruments

        The Company uses interest rate swap agreements to minimize the impact of
interest rate fluctuations on floating interest rate long-term  borrowings.  The
differential  paid or received on interest rate swap agreements is recognized as
an  adjustment  to  interest  expense.  See  Note 6 for fair  value  information
pertaining to long-term debt and derivative financial instruments.

Revenue Recognition

        Revenue,  along  with the  related  costs  of  treatment,  disposal  and
transportation,  is recorded at the time of performance of services, shipment of
products, or acceptance of waste at the Company's service centers.  Revenue from
the  Company's  treatment  and  disposal  operations,   primarily  landfill  and
incineration  facilities,  is recognized when the waste material is disposed of,
whether  burned,   landfilled,  or  treated.  Pursuant  to  contracts  with  its
customers, the Company accepts title to waste material at such time and provides
contractual  indemnification  to its customers  against  future  liability  with
respect to the waste materials.

Stock-Based Compensation

        The  Company  has  elected to apply APB 25 in  accounting  for its stock
option  plans,  providing  only  pro  forma  disclosure  required  by SFAS  123.
Accordingly,  no  compensation  cost  has been  recognized  because  the  option
exercise  price of all  options  granted  is equal  to the  market  price of the
underlying stock on the date of the grant.

Income Taxes

        Deferred  income taxes reflect the tax  consequences  on future years of
differences  between the tax bases of assets and liabilities and their financial
reporting   amounts.   Future  tax  benefits,   such  as  net   operating   loss
carryforwards,  are  recognized to the extent that  realization of such benefits
are more likely than not. Prior to May 15, 1997, the Company filed  consolidated
tax returns with Laidlaw Inc.  ("Laidlaw"),  the former parent  company.  Income
taxes for periods prior to May 15, 1997 have been  calculated  using  applicable
income tax rates on income for tax purposes on a separate return basis.

Foreign Currency Translation

        The Company's foreign  operations are all of a  self-sustaining  nature.
The functional currency of the Company's foreign  subsidiaries is its respective
local currency.  Assets and  liabilities  are translated to U.S.  Dollars at the
exchange  rate in effect at the balance  sheet date and revenue and  expenses at
weighted  monthly average exchange rates for the year. Gains and losses from the
translation of the financial statements of the foreign subsidiaries are included
in stockholders' equity.

Comprehensive Income

        During fiscal 1999, the Company  adopted  Statement No. 130,  "Reporting
Comprehensive  Income,"  ("SFAS  130").  Comprehensive  income  for all  periods
presented consists of net income and foreign currency

                                       35
<PAGE>

translation   adjustments.   Adoption  of  this  standard  required   additional
disclosures and had no effect on the Company's results of operations, cash flows
or financial position.

Use of Estimates

        The  preparation  of financial  statements in conformity  with generally
accepted  accounting  principles  requires  management  to  make  estimates  and
assumptions  that  affect the  reported  amounts of assets and  liabilities  and
disclosure of  contingent  assets and  liabilities  at the date of the financial
statements and the reported amounts of revenue and expenses during the reporting
period. Actual results could differ from those estimates.

2. BUSINESS COMBINATIONS

Rollins Environmental

        On May 15, 1997, pursuant to a February 6, 1997 stock purchase agreement
(the "Stock Purchase Agreement") between Rollins  Environmental  Services,  Inc.
("Rollins") and Laidlaw and its subsidiaries, Rollins acquired the hazardous and
industrial   waste   operations  of  Laidlaw  ("Old  LESI"  or  the  "Accounting
Acquirer").  The business combination was accounted for as a reverse acquisition
using the purchase method of accounting. Rollins issued 30 million common shares
and a $350 million 5% subordinated  convertible debenture (see Note 7), and paid
$349.1 million in cash ($400 million,  less debt of $50.9 million  assumed),  to
Laidlaw. As a result of the acquisition,  the historical  financial  information
included in these  consolidated  financial  statements is that of the Accounting
Acquirer.  The results of operations of Rollins have been included from the date
of acquisition.

Safety-Kleen Corp.

        In May  1998,  the  Company  completed  the  acquisition  of the  former
Safety-Kleen Corp. ("Old Safety-Kleen") for total consideration of approximately
$2.2 billion,  including  debt assumed and  estimated  transaction  costs.  Such
consideration was comprised of approximately  $1.5 billion cash and 41.6 million
shares of common stock.  The cash  consideration  and the refinancing of certain
existing  indebtedness  was financed from the proceeds of a $2.2 billion  Senior
Credit Facility (See Note 6).

        The  acquisition  of  Safety-Kleen  has been  accounted  for  under  the
purchase method and accordingly, the financial statements include the results of
operations of the acquired  business from the date of acquisition.  The purchase
price has been allocated to the assets  acquired and  liabilities  assumed based
upon  management's  best  estimate  of their  fair  values.  The  excess  of the
estimated  purchase price over the assets acquired of approximately $1.0 billion
is amortized over forty years.

Other

        During fiscal 1999, the Company  completed 7 acquisitions,  all of which
were accounted for under the purchase method. Accordingly, the operating results
of these  businesses are included in the financial  statements  from the date of
acquisition  and the  purchase  prices  have been  allocated  to the net  assets
acquired  based upon  management's  best estimate of the fair values.  The total
aggregate cash purchase price was $10.9 million. Pro forma results of operations
have not been  presented as the effect of these  acquisitions  on the  financial
statements was not material in the aggregate.

3.  SALE OF EUROPEAN OPERATIONS

        On December 23, 1998, the Company announced the  recapitalization of its
European operations and the formation of a new entity,  Safety-Kleen Europe. The
recapitalization,  which was based on a total  enterprise value of $190 million,
included  investments in  Safety-Kleen  Europe by Electra Fleming and the senior
management group of Safety-Kleen Europe. In exchange for the contribution of the
European  operations  of Old  Safety-Kleen,  the  Company  received a 44% equity
interest in  Safety-Kleen  Europe and will  receive  $154  million in gross cash
proceeds  (of which  $140.4  million has been  received as of August 31,  1999).
Electra Fleming  purchased a 44% equity  interest,  while the senior  management
group acquired a 12% equity  interest (on a fully-diluted  basis).  The proceeds
from the sale were used to pay down borrowings under the revolver tranche of the
Senior Credit Facility. The transaction resulted in no gain or loss.

                                       36
<PAGE>

        Effective  December  1, 1998,  the  Company  ceased to  consolidate  the
results of the European  operations  and began to account for the  investment by
the equity method.

4.  ACCOUNTS RECEIVABLE

Accounts receivable at August 31, 1999 and 1998 consisted of the following ($ in
thousands):

                                                  August 31
                                                  ---------
                                             1999           1998
                                             ----           ----
Billed trade accounts receivable         $    273,121   $    259,691
Accrued trade accounts receivable              62,335         47,959
Claims on completed contracts                  31,179          8,100
Allowance for doubtful accounts               (10,096)       (10,816)
Other                                          38,470         15,114
                                         ------------   ------------
  Total                                  $    395,009   $    320,048
                                         ============   ============

5. ACCRUED LIABILITIES

Accrued liabilities at August 31, 1999 and 1998 consisted of the following ($ in
thousands):

                                                            August 31
                                                            ---------
                                                       1999           1998
                                                       ----           ----
Current portion of environmental liabilities       $     39,204   $     45,434
Interest payable                                         19,675         28,914
Accrued salaries and benefits                            42,626         70,577
Other                                                    62,313         74,427
                                                   ------------   ------------
  Total                                            $    163,818   $    219,352
                                                   ============   ============

6. LONG-TERM DEBT

Long-term  debt at August 31, 1999 and 1998  consisted  of the  following  ($ in
thousands):

<TABLE>
<CAPTION>
                                                                        August 31
                                                                        ---------
                                                                    1999         1998
                                                                    ----         ----
Senior Credit Facility:
<S>                                                              <C>          <C>
  Term loans, U.S. ...........................................   $1,171,250   $1,238,250
  Term loans, Canadian .......................................       53,245       60,500
  Revolver ...................................................      101,167      208,000
Senior Subordinated Notes, due June 1, 2008, with an
  interest rate of 9.25% .....................................      325,000      325,000
Senior Notes, due May 15, 2009, with an interest rate of 9.25%      225,000         --
Promissory note, due May 2003, with an interest rate of 5.245%       60,000       60,000
Industrial Revenue Bonds, due 2003-2027, with fixed
  interest rates from 6.0% to 7.75% ..........................       79,950       80,891
Other ........................................................        2,176        1,410
                                                                 ----------   ----------
                                                                  2,017,788    1,974,051
Less:  current portion .......................................       85,063       77,004
Less:  unamortized deferred financing costs ..................       50,354       43,883
                                                                 ----------   ----------
  Total ......................................................   $1,882,371   $1,853,164
                                                                 ==========   ==========
</TABLE>

Senior Credit Facility

        In April 1998,  the Company  established  a $2.2 billion  Senior  Credit
Facility (the "Senior Credit  Facility")  pursuant to a credit agreement between
the Company  and a  syndicate  of banks and other  financial  institutions.  The
Senior Credit  Facility,  the  availability of which was permanently  reduced by
$325  million  to  $1.875  billion  by the  subsequent  issuance  of the  Senior
Subordinated  Notes described below,  consists of five parts: (i) a $550 million
six-

                                       37
<PAGE>

year Senior Secured Revolving Credit Facility (interest rates at August 31, 1999
of 7.63% to  8.25%)  with a $200  million  letter of  credit  sublimit  and $400
million sublimit for loans (the "Revolver"), (ii) a $455 million six-year Senior
Secured  Amortizing  Term Loan  (interest  rates at August 31,  1999 of 7.69% to
7.88%),  (iii) a $70  million  six-year  Senior  Secured  Amortizing  Term  Loan
(interest  rates at August  31,  1999 of 7.13% to  7.32%),  (iv) a $400  million
minimally  amortizing  seven-year  Senior Secured Term Loan  (interest  rates at
August 31, 1999 of 8.06% to 8.25%) and (v) a $400 million  minimally  amortizing
eight-year  Senior Secured Term Loan (interest rates at August 31, 1999 of 8.31%
to 8.50%).  The term loans referred to in clauses (ii),  (iii), (iv) and (v) are
collectively referred to herein as the "Term Loans".

        As of August  31,  1999,  the Term  Loans  have  been  drawn in full and
borrowings  outstanding  under the Revolver total $101 million.  The Company has
$299  million  of  additional  borrowing  availability  under the  Revolver.  In
addition,  there were $90 million of letters of credit issued under the terms of
the Revolver, with additional availability of $60 million.

        The Senior  Credit  Facility is  collateralized  by all of the  tangible
assets of the Company.  All of the capital stock of the  Company's  subsidiaries
are pledged to the lenders,  and such subsidiaries  guarantee the obligations of
the Company to the lenders.

        Interest costs on the Senior Credit Facility are reset periodically,  at
least  annually,  and vary depending on the particular  facility and whether the
Company chooses to borrow under Eurodollar or non-Eurodollar loans.

Senior Subordinated Notes

        On May 29, 1998,  Safety-Kleen  Services,  Inc.  (formerly known as LES,
Inc.),  a  wholly-owned  subsidiary  of the Company,  issued $325 million  9.25%
Senior  Subordinated  Notes due 2008 (the "1998  Notes") in a Rule 144A offering
which  were  subsequently  exchanged  for  substantially  identical  notes in an
offering  registered with the Securities and Exchange  Commission (the "SEC") in
November 1998. Net proceeds, after the underwriting discount and other expenses,
were  approximately  $316  million  and  were  used to  repay a  portion  of the
borrowings outstanding under the Senior Credit Facility.

        The  1998  Notes   mature  on  June  1,  2008  with   interest   payable
semi-annually  on June 1 and December 1. The 1998 Notes will be  redeemable,  in
whole or in part,  at the  option of the  Company,  at any time and from time to
time at a redemption price defined in the indenture. Upon a change in control of
the Company, each holder of the 1998 Notes may require the Company to repurchase
all or a portion of such  holder's  1998 Notes at 101% of the  principal  amount
thereof, plus accrued interest.

        The  1998  Notes  are  general  unsecured  obligations  of the  Company,
subordinated in right of payment to all existing and future senior indebtedness,
as defined, of the Company.  The 1998 Notes will rank senior in right of payment
to all existing and future subordinated indebtedness of the Company, if any. The
payment  of the 1998  Notes are  guaranteed  on a senior  subordinated  basis by
Safety-Kleen  Corp.  and  are  jointly  and  severally  guaranteed  on a  senior
subordinated  basis by the  Company's  wholly-owned  domestic  subsidiaries.  No
foreign direct or indirect subsidiary or non-wholly-owned domestic subsidiary is
an obligor or guarantor on the financing.

Senior Notes

        On May 17, 1999,  the Company issued $225 million 9.25% Senior Notes due
2009  (the  "1999  Notes")  in a Rule  144A  offering  which  were  subsequently
exchanged for substantially  identical notes in an offering  registered with the
SEC in September 1999. Net proceeds,  after the underwriting  discount and other
expenses,  were  approximately  $214  million  and were used to finance the cash
portion of the purchase  price for the repurchase of the PIK Debenture (see Note
7), for expenses relating to the repurchase and for general corporate purposes.

        The  1999  Notes   mature  on  May  15,  2009  with   interest   payable
semi-annually  on May 15 and November 15. The 1999 Notes will be redeemable,  in
whole or in part,  at the  option of the  Company,  at any time and from time to
time at a redemption price as defined in the indenture. Upon a change in control
of the  Company,  each  holder of the 1999  Notes may  require  the  Company  to
repurchase all or a portion of such holder's 1999 Notes at 101% of the principal
amount thereof, plus accrued interest.

                                       38
<PAGE>

        The 1999 Notes are  unsecured  and rank  equally  with all  existing and
future senior  indebtedness  and senior to all existing and future  subordinated
indebtedness. The Notes are not guaranteed by the Company's subsidiaries.

Debt Covenants

        The Senior Credit Facility contains negative,  affirmative and financial
covenants  customarily  found  in  credit  agreements  for  similar  financings,
including   covenants   restricting  debt,   guarantees,   liens,   mergers  and
consolidations,  sales of assets and payment of  dividends  and  establishing  a
total  leverage ratio test, a fixed charge  coverage test, an interest  coverage
ratio test and a maximum  contingent  obligation  to  operating  cash flow ratio
test. The 1998 and 1999 Notes contain certain affirmative and negative covenants
which,   in  certain   instances   and  subject  to  certain   limitations   and
qualifications, restrict, among other things, the incurrence of additional debt,
restricted payments,  assets sales,  transactions with affiliates,  dividend and
other payments, the issuance of stock of subsidiaries to third parties,  certain
liens, and certain consolidations, mergers or sales of assets.

        The aggregate amount of minimum  payments  required on long-term debt in
each of the years indicated is as follows ($ in thousands):

                 YEAR ENDED AUGUST 31

                   2000                              $     85,063
                   2001                                   114,843
                   2002                                   113,767
                   2003                                   149,952
                   2004                                   267,326
                   Thereafter                           1,286,837
                                                     ------------
                     Total minimum payments due      $  2,017,788
                                                     ============

        In  management's  view,  the fair value of long-term  debt at August 31,
1999 is  approximately  $1,966.2  million,  as compared  to a carrying  value of
$1,967.4 million.

        The promissory  note and $15.7 million of the  Industrial  Revenue Bonds
are guaranteed by Laidlaw.

        The Company has entered  into  interest  rate swap  agreements  to alter
interest rate exposures.  These agreements,  with a principal notional amount of
$1,095 million,  expire in periods  ranging from 2 to 30 years,  with a weighted
average of  approximately  10.2 years. The Company pays fixed rates ranging from
5.31%  to  6.71%,  and  receives  floating  rates  based on U.S.  Dollar  LIBOR,
determined on a quarterly basis of 5.52% as of August 31, 1999.

        Credit risk arises from the possible inability of counterparties to meet
the terms of their contracts on a net basis. All of the Company's  interest rate
swap agreements have been entered into with major financial  institutions  which
are expected to fully perform under the terms of the  agreements.  The Company's
credit exposure on swaps is related not to the notional balances of the interest
rate swaps, but to the current and potential replacement costs of all profitable
contracts  at year end. At August 31, 1999 this credit  exposure is  immaterial.
Credit  exposure  will  increase  along with the market  value of the swaps,  if
interest rates increase, and decrease if interest rates decline.

        Derivative  financial  instrument fair values represent an approximation
of amounts the Company  would have paid to or received  from  counterparties  to
terminate its positions prior to maturity, and are based on capital market rates
prevailing at August 31, 1999.  The  Company's  fair value cost for all interest
rate  derivative  contracts  as of August  31,  1999,  was  approximately  $30.6
million.  At August  31,  1999,  the  Company  had no plans to  terminate  these
positions prior to maturity.

7. SUBORDINATED CONVERTIBLE DEBENTURE

        Pursuant to the  Rollins  acquisition  described  in Note 2, the Company
issued a $350 million 5% subordinated convertible, pay-in-kind debenture ("PIK")
due May 15, 2009 to Laidlaw.  Interest  payments  due during the first two years
after the  acquisition  of  Safety-Kleen  are  required to be  satisfied  by the
issuance of the

                                       39
<PAGE>

Company's  common shares,  based on the market price of the common shares at the
time the interest  payments are due.  During the year ended August 31, 1999, the
Company issued 1,545,399 shares to Laidlaw in satisfaction of interest  payments
due.

        On August 27,  1999,  the Company  repurchased  the PIK for an aggregate
purchase price comprised of (i) $200 million in cash, (ii) 11,320,755  shares of
common stock and (iii) 376,858 shares of common stock in satisfaction of accrued
and unpaid  interest on the PIK  Debenture to the date of  repurchase.  The cash
portion of the purchase  price was financed  with the issuance of the 1999 Notes
(See Note 6).

8.  CLOSURE, POST-CLOSURE AND ENVIRONMENTAL REMEDIATION LIABILITIES

        The  Company has  recorded  liabilities  for  closure  and  post-closure
monitoring and environmental remediation costs as follows ($ in thousands):

                                                              August 31
                                                              ---------
                                                         1999           1998
                                                         ----           ----
Current portion, included in accrued liabilities      $   39,204     $   45,434
Non-current portion, included in environmental
  and other long-term liabilities                        208,842        220,669
                                                      ----------     ----------
    Total                                             $  248,046     $  266,103
                                                      ==========     ==========

        The business of the Company's hazardous and industrial waste services is
continuously regulated by federal,  state,  provincial and local provisions that
have been enacted or adopted,  regulating  the  discharge of materials  into the
environment  or primarily for the purpose of  protecting  the  environment.  The
nature of the Company's businesses results in its frequently becoming a party to
judicial or  administrative  proceedings  involving  all levels of  governmental
authorities and other interested parties. The issues that are involved generally
relate to  applications  for  permits  and  licenses  by the  Company  and their
conformity with legal requirements and alleged technical  violations of existing
permits and  licenses.  The Company does not believe that these  matters will be
material to its operations or financial condition.

        Closure  and  post-closure  monitoring  and  maintenance  costs for U.S.
landfills are estimated based on the technical  requirements of Subtitle C and D
Regulations of the U.S. Environmental  Protection Agency or the applicable state
requirements,  whichever is stricter,  and the air emissions standards under the
Clean Air Act.  The  costs  include  such  items as final  capping  of the site,
methane gas and leachate  management,  groundwater  monitoring and operation and
maintenance costs to be incurred during the period after the facility closes and
ceases  to accept  waste.  Closure  and  post-closure  costs  for the  Company's
landfills in Canada are based upon the local landfill regulations  governing the
facility.

        The  Company  has also  established  procedures  to  routinely  evaluate
potential remedial liabilities at sites that it owns or operates, or to which it
transports waste,  including 51 sites listed on the Superfund  National Priority
List ("NPL"). In the majority of situations,  the Company's  connection with NPL
sites  relates to  allegations  that its  subsidiaries,  or their  predecessors,
transported waste to the facilities in question,  often prior to the acquisition
of such subsidiaries by the Company. The Company routinely reviews and evaluates
sites requiring  remediation,  including NPL sites, giving  consideration to the
nature (i.e., owner,  operator,  transporter or generator) and the extent (i.e.,
amount  and  nature  of waste  hauled to the  location,  number of years of site
operations or other relevant factors) of the Company's  alleged  connection with
the site,  the accuracy and strength of evidence  connecting  the Company to the
location,  the  number,  connection  and  financial  ability of other  named and
unnamed potentially responsible parties and the nature and estimated cost of the
likely remedy.  Where the Company concludes that it is probable that a liability
has been  incurred,  provision is made in the financial  statements,  based upon
management's  judgment and prior experience,  for the Company's best estimate of
the  liability.  If no amount within the range  appears to be a better  estimate
than any other amount,  then the Company  provides for the minimum amount within
the range in accordance with Statement of Financial  Accounting  Standards No. 5
("SFAS 5"),  "Accounting  for  Contingencies".  Such estimates are  subsequently
revised as deemed necessary as additional  information  becomes  available.  The
Company  believes that it is more than  remotely  possible but less than likely,
that its  potential  liability  could be at the high end of such  ranges,  which
would be  approximately  $40.0 million higher in the aggregate than the estimate
that has been recorded in the financial statements as of August 31, 1999.

                                       40
<PAGE>

        Estimates of the extent of the Company's  degree of  responsibility  for
remediation of a particular site and the method and ultimate cost of remediation
require a number of assumptions and are inherently  difficult to evaluate,  such
that the  ultimate  outcome  may differ from  current  estimates.  However,  the
Company  believes that its extensive  experience in the  environmental  services
business,  as well as its involvement  with a large number of sites,  provides a
reasonable  basis  for  estimating  its  aggregate   liability.   As  additional
information  becomes available,  estimates are adjusted as necessary.  While the
Company does not anticipate  that any such  adjustment  would be material to its
financial statements,  it is reasonably possible that technological,  regulatory
or  enforcement  developments,  the  results of  environmental  studies or other
factors could necessitate the recording of additional liabilities which could be
material.  The impact of such future  events  cannot be estimated at the current
time.

        Where  the  Company  believes  that  both  the  amount  of a  particular
environmental  liability  and the timing of the  payments  are fixed or reliably
determinable,  the cost in  current  dollars  is  discounted  to  present  value
assuming  inflation  of 3.6% and a risk  free  discount  rate of  8.5%.  Had the
Company not discounted any portion of its liability,  the amount  recorded would
have been  increased by  approximately  $11.0 million at August 31, 1999 (1998 -
$7.0 million).

        The  majority of the  Company's  active  landfill  sites have  estimated
remaining  lives  ranging  from two, to more than 100 years,  based upon current
site plans and  anticipated  annual volumes of waste. As of August 31, 1999, the
Company  estimates  that during this remaining site life, it will provide for an
additional  $63.6  million  (1998 - $59.0  million) of closure and  post-closure
costs, including accretion for the discount recognized to date.

         Activity in the Company's environmental  liabilities during fiscal 1998
and 1999 is as follows ($ in thousands):

<TABLE>
<CAPTION>

                            Closure/Post Closure              Remediation
                            --------------------              -----------
                          Open Sites   Closed Sites    Open Sites   Closed Sites    Total
                          ----------   ------------    ----------   ------------    -----
<S>                        <C>          <C>             <C>          <C>          <C>

Balance, August 31, 1997   $  40,805    $   1,598       $  75,358    $  65,300    $ 183,061
Operating expenses .....         502           81           2,836         --          3,419
Expenditures ...........      (6,054)      (1,679)        (15,695)      (6,735)     (30,163)
Restructuring charge
(see
  Note 12) .............        --         12,765           --          20,029       32,794
Acquisitions ...........        --           --            72,440        5,466       77,906
Other ..................        (204)        --              (704)          (6)        (914)
                           ---------    ---------       ---------    ---------    ---------
Balance, August 31, 1998      35,049       12,765         134,235       84,054      266,103
Operating expenses .....       1,352         --             3,055            4        4,411
Expenditures ...........      (1,516)         (23)        (17,440)     (23,110)     (42,089)
Restructuring charge
(see
  Note 12) .............        --         (7,350)           --         (4,000)     (11,350)
Acquisitions ...........        --           --            33,927         --         33,927
Dispositions ...........        --           --            (1,018)        --         (1,018)
Other ..................        (336)        --            (1,605)           3       (1,938)
                           ---------    ---------       ---------    ---------    ---------
Balance, August 31, 1999   $  34,549    $   5,392       $ 151,154    $  56,951    $ 248,046
                           =========    =========       =========    =========    =========
</TABLE>

        Remediation  costs at closed  sites  includes  the  Company's  estimated
liability in connection with third party NPL locations.

                                       41
<PAGE>

        Anticipated payments of undiscounted  environmental liabilities for each
of the next five years and thereafter are as follows ($ in thousands):

                 YEAR ENDED AUGUST 31

                   2000                      $     39,204
                   2001                            31,098
                   2002                            18,244
                   2003                            13,480
                   2004                            25,855
                   Thereafter                     183,773
                                             ------------
                     Total                   $    311,654
                                             ============

        In conjunction with the acquisitions of certain facilities,  the Company
has  obtained  varying  amounts  and  types of  indemnification  from  potential
environmental liabilities existing at the time of acquisition.  Such indemnities
typically cover all or a portion of the costs associated with the remediation of
such pre-existing environmental liabilities,  and may be available for a limited
period of time. The Company periodically evaluates the ability of the sellers to
perform  under the  indemnification  agreements  and will record a receivable if
collection is probable.

9. COMMITMENTS AND CONTINGENCIES

Lease Commitments

        Rental  expense  incurred  under  operating  leases,  primarily for real
property and vehicles,  was $55.6 million,  $50.5 million,  and $36.1 million in
1999, 1998, and 1997, respectively. Minimum future rental amounts required under
operating  leases for  premises and  equipment  having  non-cancelable  terms in
excess of one year as of August 31, 1999, are as follows ($ in thousands):

                 YEAR ENDED AUGUST 31

                   2000                                  $     28,655
                   2001                                        23,553
                   2002                                        17,226
                   2003                                        11,707
                   2004                                         7,462
                   Thereafter                                  11,848
                                                         ------------
                     Total                               $    100,451
                                                         ============

Financial Assurance Obligations

        As of August  31,  1999,  the  Company  provided  financial  assurances,
primarily by insurance policies, performance bonds and letters of credit, to the
applicable  regulatory  authorities,  totaling  approximately $502.2 million, in
connection with the closure and  post-closure  requirements of certain  facility
operating permits.

Legal Proceedings

        From  time to time,  the  Company  is named as a  defendant  in  various
lawsuits  arising in the  ordinary  course of  business,  including  proceedings
wherein  persons  claim injury  resulting  from the use of the  Company's  parts
cleaner equipment and/or cleaning  products,  other matters  involving  personal
injury and property  damage claims and  employment-related  claims.  A number of
such legal proceedings are currently pending in various courts and jurisdictions
throughout North America.  Based on the Company's assessment of known claims and
its historical claims payment pattern, and discussions with internal and outside
legal counsel and risk management personnel,  the Company believes that there is
no proceeding  pending against the Company  relating to such matters arising out
of the ordinary course of business that, if resolved against the Company,  would
have a  materially  adverse  effect upon the  Company's  consolidated  financial
position.  Although  uncertainties  exist  in  these  proceedings,  the  Company
believes that it is more than remotely  possible but less than likely,  that its
potential liability could be approximately $41.5 million higher in the aggregate
that the  estimate  that has been  recorded in the  financial  statements

                                       42
<PAGE>

as of  August  31,  1999.  In  the  event  of  an  unanticipated  adverse  final
determination in respect of these cases,  the Company's  consolidated net income
for the period in which such determination occurs could be materially affected.

        On March 1, 1999,  Laidlaw  announced a settlement of a dispute  between
Laidlaw's  United States  subsidiaries  and the Commissioner of Internal Revenue
relating  to  the  timing  and   deductibility  for  tax  purposes  of  interest
attributable  to loans owing to related  foreign  persons  during the years from
1986 to 1994.  The total net after tax cash cost to  Laidlaw  was  approximately
$226 million. The payment includes  approximately $121 million in taxes together
with interest of  approximately  $161 million  ($105  million  after tax).  This
settlement resolves matters in the United States Tax Court (captioned as Laidlaw
Transportation,  Inc.  and  Subsidiaries  et.  al v.  Commissioner  of  Internal
Revenue,  Docket Nos.  9361-94 and 9362-94)  relating to the 1986 to 1991 fiscal
years as well as claims  raised in a thirty day letter  relating  to the 1992 to
1994 fiscal years.  The  Commissioner  of Internal  Revenue had asserted  claims
totaling approximately $500 million.

        Pursuant to the Stock Purchase  Agreement referred to in Note 2, Laidlaw
and  Laidlaw  Transportation,   Inc.  agreed  to  be  responsible  for  any  tax
liabilities,  including  the costs to defend the  subsidiaries,  resulting  from
these matters.  Based upon  discussions  with Laidlaw,  the Company's income tax
provision determined on a separate return basis during the period audited by the
Internal  Revenue Service was sufficient and no additional taxes or interest are
due to or from Laidlaw as a result of the settlement.

10. STOCKHOLDERS' EQUITY

        The  Company is  authorized  to issue 250  million  shares of its $1 par
value common stock and one million shares of its $1 par value  preferred  stock.
The terms and conditions of each issue of preferred  stock are determined by the
Board of Directors. No preferred stock has been issued.

11. STOCK OPTION PLANS

The Company has the following stock option plans:

       1.     The 1982 Stock  Option  Plan of the former  Rollins  Environmental
              Services, Inc.
       2.     The 1993 Stock  Option  Plan of the former  Rollins  Environmental
              Services, Inc.
       3.     The 1997 Directors Stock Option Plan
       4.     The 1997 Stock Option Plan

All outstanding  employee stock options granted by the former Rollins were fully
vested on May 15,  1997,  in  accordance  with the  terms of the Stock  Purchase
Agreement referred to in Note 2.

Option activity is as follows:

<TABLE>
<CAPTION>

                                                                               1999                   1998
                                                                               ----                   ----
                                                                                    Weighted              Weighted
                                                                                    Average               Average
                                                                                    Exercise              Exercise
                                                                       Shares        Price     Shares     Price
                                                                       ------        -----     ------     -----
<S>                                                                 <C>             <C>        <C>        <C>

Outstanding at beginning of year ................................       780,100     $ 14.924   510,011    $ 15.976
Granted .........................................................       538,625     $ 13.250   396,562    $ 15.352
Exercised ......................................................        (18,250)    $ 11.613   (42,225)   $ 12.056
Expired or canceled .............................................      (107,112)    $ 18.032   (84,248)   $ 24.748
                                                                    -----------     -------    -------    --------
Outstanding at end of year ......................................     1,193,363     $ 13.947   780,100    $ 14.924
                                                                    ===========     ========   =======    ========
Options available for grant .....................................       402,937                941,562
Options exercisable .............................................       206,788                146,037

</TABLE>

                                       43
<PAGE>

<TABLE>
<CAPTION>
                                    1999                                        1998
                                    ----                                        ----
                                  Weighted                                     Weighted
                                   Average         Weighted                     Average      Weighted
                                  Remaining        Average                     Remaining     Average
   Range of         Options      Contractual       Exercise      Options      Contractual    Exercise
Exercise Price    Outstanding       Life            Price      Outstanding       Life         Price
- --------------    -----------       ----            -----      -----------       ----         ------
<S>               <C>          <C>                 <C>         <C>            <C>            <C>

$10.50-$11.50         6,750      4.26 years        $ 11.500       20,500      2.85 years     $ 11.160
$12.75-$15.75     1,167,688      8.90 years        $ 13.798      693,438      9.43 years     $ 14.240
$16.50-$23.00        15,300      2.77 years        $ 20.299       45,150      3.00 years     $ 19.044
$30.00-$35.50         2,500      0.25 years        $ 35.500       19,887      0.37 years     $ 31.384
$44.50-$49.00 .       1,125      0.47 years        $ 49.000        1,125      1.47 years     $ 49.000
- -------------     ---------      ----------        --------    ---------      ----------     ---------
$10.50-$49.00    1,193,363       8.77 years        $ 13.947      780,100      8.64 years     $ 14.924
=============    =========    ==============       ========    =========      ===========    =========

</TABLE>

        Effective  July 9, 1997,  the  directors  of the  Company  set aside 1.5
million  shares of its $1 par value common stock for issuance under a 1997 stock
option  plan.  All options  under this plan are for a term of ten years from the
date of grant and become  exercisable with respect to 20% of the total number of
shares subject to the option, one year after the date of grant, and with respect
to an  additional  20% at the  end of  each  12  month  period  thereafter  on a
cumulative  basis during the  succeeding  four years.  The plan provides for the
granting  of stock  options to certain  senior  employees  and  officers  of the
Company at the discretion of the Board of Directors.  All options are subject to
certain  conditions of service.  Options for 351,563  shares were granted during
fiscal  1998 at  exercise  prices  ranging  from  $15.25 to $15.75.  Options for
471,125 shares were granted during fiscal 1999 at an exercise price of $13.25.

        Effective  July 9, 1997,  the directors of the Company set aside 135,000
shares of its $1 par value  common  stock for  issuance  under a 1997  directors
stock option plan.  All options under this plan are for a term of ten years from
the date of grant and become exercisable with respect to 20% of the total number
of shares  subject to the  option,  one year  after the date of grant,  and with
respect to an additional 20% at the end of each 12 month period  thereafter on a
cumulative  basis during the succeeding  four years.  All options are subject to
certain  conditions of service.  Options for 45,000  shares were granted  during
fiscal  1998 at an  exercise  price of $15.25.  Options  for 67,500  shares were
granted during fiscal 1999 at an exercise price of $13.25.

        In accordance  with the  disclosure  requirements  of SFAS 123, the fair
value of each option grant has been  estimated as of the date of grant using the
Black-Scholes   option  pricing  model  with  the  following   weighted  average
assumptions:

                                                August 31
                                                ---------
                                    1999           1998           1997
                                    ----           ----           ----
Risk free interest rate               4.7%           4.5%            4.5%
Expected life                     9.8 years      8.7 years      8.7 years
Dividend rate                         0.0%           0.0%           0.0%
Expected volatility                  27.7%          28.6%          19.4%

        Had  compensation  cost for these  plans  been  determined  based on the
Black-Scholes value at the grant dates for awards as prescribed by SFAS No. 123,
pro forma net income  and  earnings  per share  would have been as follows ($ in
thousands, except per share data):

                                                  Year Ended August 31
                                                  --------------------
                                              1999        1998        1997
                                              ----        ----        ----
Net income (loss):

  As reported                              $  88,876    $   205   $ (183,432)
  Pro forma                                   87,363       (260)    (183,727)
Net income (loss) per share:

  As reported                              $    0.90    $    --    $   (5.32)
  Pro forma                                     0.88         --        (5.32)

                                       44
<PAGE>

12. RESTRUCTURING AND OTHER CHARGES

        The integration related to the acquisitions described in Note 2 have, or
will result in, the closing and remediation of certain of the existing operating
facilities  that  have  become  redundant  and  the  incurrence  of  other  exit
activities related to the acquisitions.

1997 Restructuring Charge

        With  respect  to the  Old  LESI  operations,  the  Company  recorded  a
restructuring  charge of $331.7  million  ($200  million after tax, or $6.10 per
share)  against income in the quarter ended May 31, 1997, to reflect the closing
of  certain  of the  operating  facilities  that had  become  redundant,  and an
impairment in the carrying  value of certain  operating  facilities due to lower
expected  future  cash flows as a result of the  Rollins  acquisition.  The plan
commitment  date was May 15, 1997, the date of the Rollins  acquisition,  as the
implementation  of  the  plan  was  contingent  upon  the  consummation  of  the
acquisition.

        The  restructuring  charge  included  a $242  million  asset  write-down
related  to Old LESI  facilities  that were  closed  as a result of the  Rollins
acquisition.  The facilities  that were determined to be redundant and scheduled
for closure primarily included four treatment,  storage and disposal facilities,
two  wastewater  treatment   facilities,   two  landfills,   two  transportation
divisions,  one  incinerator,  and one certified  lab. Other than two facilities
which  remain open at August 31,  1999,  all  facilities  scheduled  for closure
ceased operations as soon as practicable after the commitment date, but no later
than August 31, 1997. The closure process  included  informing  customers of the
redirection  of the  waste  streams  to  alternative  facilities  and the  final
treatment and disposal of the existing waste at the facility.  It is anticipated
that the closure of the two open facilities will be completed by August 2002 and
August 2004. Management determined that it is more economically feasible for the
Company to  continue to operate on a limited  basis and  satisfy the  regulatory
mandated cell closure and capping  requirements  through the disposal of outside
waste streams into existing  constructed landfill cells, than to cease accepting
all customer  waste and purchase fill  material to close the cells.  The revenue
and  results  of  operations  at these  two  facilities  are  immaterial  to the
consolidated revenue and results of operations of the Company.

        Other than a  transportation  facility,  the  certified  lab and certain
equipment at the incineration  facility, all assets are expected to be abandoned
once the closure process is completed. The Company does not expect to be able to
sell the real property based upon their past use as hazardous waste  facilities.
For those facilities scheduled for closure by abandonment,  assets that could be
utilized  elsewhere within the Company were transferred and the remaining assets
were written  down to zero value.  Assets held for sale were valued at estimated
fair value less  directly  related  costs to sell.  As of August 31,  1999,  the
Company has certain equipment  remaining to be sold with a carrying value, which
approximates estimated fair value, of $13.7 million.

        Also  included  in  the  1997  restructuring  charge  is a  $65  million
impairment  loss in the  carrying  value of certain  operating  facilities  as a
result of the  Rollins  acquisition.  This was  attributable  to lower  expected
future cash flows at three  facilities  (primarily the Pinewood,  South Carolina
hazardous  waste landfill  facility) due to reduced waste volumes as a result of
redirecting certain waste streams to acquired incinerator  operations.  The fair
value was determined based upon an estimate of the discounted net cash flows for
these three facilities.

        The  expected  cash costs were $25.0  million and  primarily  related to
closure and post-closure  costs.  Total  expenditures of $22.2 million have been
incurred  to date  ($7.8  million  incurred  in  fiscal  1999),  resulting  in a
remaining balance of $2.8 million.

1998 Restructuring Charge

        During the third  quarter of fiscal  1998,  with respect to the existing
operations,  the Company recorded a restructuring charge of $65.8 million ($39.5
million  after tax or $0.56 per share)  against  earnings  to reflect  the costs
associated with the closing and remediation of certain facilities and other exit
activities  as a result of the  acquisition  of Old  Safety-Kleen.  The plan was
approved by management in May 1998.

        The 1998  restructuring  charge includes a $32 million asset  write-down
related to LESI  facilities  that were closed as a result of the  acquisition of
Old  Safety-Kleen.  The  facilities  that were  determined  to be redundant  and


                                       45
<PAGE>

scheduled for closure primarily  included one incinerator and two transportation
facilities.  Effective August 31, 1998, the incinerator  ceased to receive waste
shipments  from  customers  and one  transportation  facility  was  closed.  The
remaining facilities were closed during fiscal 1999.

        It is  anticipated  that the  facilities  scheduled  for closure will be
abandoned.  The  Company  does not  expect to be able to sell the real  property
based upon their past use as hazardous waste  facilities.  For those  facilities
scheduled for closure by  abandonment,  assets that could be utilized  elsewhere
within the Company were  transferred and the remaining  assets were written down
to zero value.

        Included in the  restructuring  charge was $34 million  that  represents
cash costs to be  incurred  during  subsequent  periods,  of which $2 million is
severance cost relating to the termination of  approximately 45 employees at the
incinerator and 23 at the  transportation  facility.  There were no expenditures
related to these costs during fiscal 1998.

        During fiscal 1999, the Company  reevaluated  the costs  associated with
closing and  remediating  the  facilities  to be closed.  As a result of further
investigation and evaluation of alternative  remediation methods and discussions
with the  regulatory  authorities,  the  estimate of the costs to be incurred to
remediate the  identified  facilities  has been  determined to be less than that
accrued  in May  1998.  Also,  the  Company  decided  during  fiscal  1999  that
additional LESI facilities would be closed as a result of the acquisition of Old
Safety-Kleen and that additional LESI personnel should be terminated.

The balance of the 1998 restructuring  charge was impacted during fiscal 1999 as
follows ($ in thousands):

            Balance, August 31, 1998                      $     34,034
            Change in estimate of remedial costs               (14,166)
            Additional costs:

              Facility closures - remediation                    2,816
              Personnel terminations                            10,850

            Payments                                           (23,367)
                                                          -------------
            Balance, August 31, 1999                      $     10,167
                                                          =============

13. INCOME TAXES

        Prior to May 15, 1997, the Company filed  consolidated  tax returns with
Laidlaw (See Note 1). The income tax expense  (benefit) for periods ending after
May 15, 1997 are comprised as follows ($ in thousands):

                                               Year Ended August 31
                                               --------------------
                                         1999          1998           1997
                                         ----          ----           ----
Current:

  Federal                            $      674     $       --     $   (30,236)
  State                                   3,739            810           1,000
  Foreign                                10,114          5,480          (2,064)
Deferred:
  Federal                                67,566          1,827         (87,086)
  State                                     (30)        (7,477)        (12,440)
  Foreign                                11,538            999           8,037
                                     -----------    -----------    ------------
Income tax expense (benefit)         $   93,601     $    1,639     $  (122,789)
                                     ===========    ===========    ============

        Income tax expense (benefit) is included in the financial  statements as
follows ($ in thousands):

                                               Year Ended August 31
                                               --------------------
                                         1999          1998           1997
                                         ----          ----           ----
Continuing                           $   78,565     $    9,133     $   (122,789)
Extraordinary loss                       15,036         (7,494)            --
                                     ------------   -------------  -------------
Income tax expense (benefit)         $   93,601     $    1,639     $   (122,789)
                                     ============   ============   =============

                                       46
<PAGE>

        A reconciliation of the income tax on income from continuing  operations
calculated  by applying the domestic  statutory  federal  income tax rate to the
income (loss) before income taxes is as follows ($ in thousands):

                                                       Year Ended August 31
                                                       --------------------
                                                      1999      1998      1997
                                                      ----      ----      ----
Federal income tax expense (benefit) at statutory    35.0%     35.0%     (35.0)%
rate
State income tax expense (benefit)                    3.4%     (4.2)%     (5.2)%
Change in valuation allowance                        (2.2)%   (10.4)%       --
Foreign country rate differential                     2.6%      2.2%        --
Goodwill                                              5.3%     18.6%        --
Other                                                (0.8)%     3.7%       0.1%
                                                   --------  --------  ---------
Income tax expense (benefit)                         43.3%     44.9%     (40.1)%
                                                   ========  ========  =========

        Deferred tax assets and  liabilities  consisted  of the  following ($ in
thousands):

                                                    August 31
                                                    ---------
                                                 1999         1998
                                                 ----         ----
Deferred tax assets:

  Accrued liabilities                       $  124,742     $  128,175
  Tax attribute carryovers                      98,010        123,913
  Interest                                          --         14,155
  Other                                             --         11,882
                                            ----------     ----------
    Total gross deferred tax assets            222,752        278,125
    Less: valuation allowance                   16,529         37,429
                                            ----------     ----------
Net deferred tax assets                        206,223        240,696
                                            ----------     ----------
Deferred tax liabilities:
  Excess of tax over book depreciation         687,277        710,286
  Other                                         16,677         27,634
                                            ------------   ----------
    Total gross deferred tax liabilities       703,954        737,920
                                            ------------   ----------
Net deferred tax liabilities                $  497,731     $  497,224
                                            ============   ==========

        The Company has net  operating  loss  carryforwards  for federal  income
taxes  expiring  in the  years  2008 to  2013 of  $166.3  million.  A  valuation
allowance of $35.2 million has been recorded against $46.8 million of these loss
carryforwards  which are  subject to  limitations  of both  Treasury  Regulation
1.1502-21 and Internal  Revenue Code ("IRC") Section 382.  Foreign net operating
losses expiring in the years 2000 to 2005 are $19.4 million. Interest carryovers
of $15.4 million limited by IRC Section 163(j) are available against federal tax
without expiration.

14. DISCONTINUED OPERATIONS

        On May 1, 1997, in contemplation of the Rollins acquisition described in
Note 2, the Company  transferred,  in a non-cash  transaction,  JTM  Industries,
Inc.,  its  coal  combustion   by-products  management  operations  to  Laidlaw.
Accordingly,  no gain or loss was recognized on this transfer.  These operations
were retained by Laidlaw and are not part of the Company's  ongoing  operations.
Accordingly,  the Company  has  classified  these  operations  as  discontinued.
Revenue for the discontinued operations for 1997 was $41.5 million.

15.  EXTRAORDINARY LOSS

        In April 1998, the Company repaid its existing Bank Credit  Facility and
established  the Senior Credit  Facility  (See Note 6). In connection  with this
refinancing,  the Company  recognized an extraordinary  charge in fiscal 1998 of
approximately  $18.8  million  ($11.3  million  after  tax,  or $0.18 per share)
related to the write-off of previous  deferred debt issuance costs and repayment
penalties.

        In August  1999,  the  Company  repurchased  the PIK  issued to  Laidlaw
pursuant  to the  Rollins  acquisition  (See  Note 7). In  connection  with this
repurchase,  the Company  recognized an  extraordinary  charge in fiscal 1999 of


                                       47
<PAGE>

approximately  $15.0  million  ($0.17 per share)  related  to the  write-off  of
certain  deferred tax assets  associated with the PIK that were  permanently and
directly lost due to the early retirement of the PIK.

16. EARNINGS PER SHARE

        The following table  represents a  reconciliation  of the shares used to
calculate basic and diluted earnings per share for each of the three years ended
August 31, 1999:

                                                      Year Ended August 31
                                                      --------------------
                                                  1999       1998      1997
                                                  ----       ----      ----
Numerator ($ in thousands):

  Net income (loss) - basic                    $  88,876   $   205   $(183,432)
  Add interest, net of tax, on subordinated
    Convertible debenture                         11,274        --          --
                                               ---------   -------   ----------
  Total - diluted                              $ 100,150   $   205   $(183,432)
                                               =========   =======   ==========
Denominator (000s):

  Weighted average shares outstanding - basic     88,537    62,322      34,508
  Effect of dilutive securities:
    Employee stock options                            28        --          --
    Subordinated convertible debenture            23,080        --          --
                                               ---------  --------   ---------
  Weighted average shares outstanding - diluted  111,645    62,322      34,508
                                               =========  ========   ==========

Basic earnings per share                       $    1.00  $    --    $   (5.32)
Diluted earnings per share                     $    0.90  $    --    $   (5.32)

        Potentially dilutive shares are excluded from diluted shares outstanding
for  fiscal  1998 and 1997  because  the  effect  of  their  inclusion  would be
anti-dilutive.  The number of  potentially  dilutive  shares  excluded  from the
earnings per share  calculation was 23,421,000 and 6,582,000 for fiscal 1998 and
1997, respectively.

17. RELATED PARTY TRANSACTIONS

        Included in selling,  general and administrative expenses are management
fees paid to Laidlaw in the amount of $2.6 million during fiscal 1997.  Interest
expense in fiscal 1997 includes $24.0 million allocated from Laidlaw.

        Management  fees have been  allocated to the  Company,  prior to May 15,
1997,  based  upon  the  Company's  share  of  Laidlaw's  consolidated  revenue.
Management fees are charged by Laidlaw to each of its operating  groups in order
to recover  its general  and  administrative  costs.  The  services  provided by
Laidlaw include treasury, taxation and insurance.

        Insurance premiums paid to Laidlaw totaled $21.5 million, $11.3 million,
and $7.2 million in fiscal 1999, 1998, and 1997, respectively.

        Certain  directors  and officers of the Company are also  directors  and
officers of Laidlaw.

18. SEGMENT AND GEOGRAPHIC INFORMATION

        In 1997, the FASB issued Statement of Financial Accounting Standards No.
131, "Disclosures about Segments of an Enterprise and Related Information." SFAS
131 establishes  standards for reporting information about operating segments in
financial  statements.  In general, the standard requires that business entities
report selected information about operating segments in a manner consistent with
that used for internal management reporting.

        The Company is  organized  along its two primary  business  activities -
Collection  and Recovery and  Treatment and  Disposal.  Collection  and Recovery
involves providing various services to both industrial and commercial customers.
These  services  include parts  cleaners and hazardous and  non-hazardous  waste
collection.

                                       48
<PAGE>

Treatment and Disposal  involves the  treatment,  recycling and  destruction  of
hazardous and non-hazardous waste at Company owed and operated  facilities.  The
Company  operates  thermal  destruction  incinerators,  landfills and wastewater
treatment  facilities.  Each segment is managed independently from the other and
reports separately to senior management.  Transactions  between the segments are
accounted  for  at the  Company's  estimate  of  fair  value  based  on  similar
transactions with outside customers. The accounting policies of the segments are
the same as those described in the summary of significant  accounting  policies.
The Company evaluates performance based on several factors, of which the primary
financial  measure is operating  income  before  depreciation  and  amortization
("EBITDA") and before  restructuring and other non-recurring  charges. The table
below reflects certain  information  relating to the Company's  operations ($ in
thousands):

<TABLE>
<CAPTION>
                                  Collection    Treatment
                                 and Recovery  and Disposal    Europe       Other       Total
                                 ------------  ------------    ------       -----       -----
Fiscal 1999
<S>                              <C>           <C>          <C>          <C>          <C>
  Outside revenue                $ 1,340,807   $  313,441   $   31,700   $       --   $ 1,685,948
  Intercompany revenue                51,381      131,283           --     (182,664)           --
  Depreciation and amortization       46,164       35,979        3,438       50,421       136,002
  EBITDA before restructuring
    and other non-recurring

    Charges                          433,434      132,509        7,605      (92,763)      480,785
  Total assets                     2,383,965    1,697,880           --      284,959     4,366,804
  Capital expenditures                49,981       11,800        1,965        9,847        73,593

Fiscal 1998
  Outside revenue                $   813,000   $  324,600   $   47,873   $       --   $ 1,185,473
  Intercompany revenue                38,330      116,642           --     (154,972)           --
  Depreciation and amortization       29,802       36,306        5,730       21,213        93,051
  EBITDA before restructuring
    and other non-recurring
    Charges                          201,184      110,940       12,317      (45,167)      279,274
  Total assets                     2,078,195    1,533,863      311,555      545,282     4,468,895
  Capital expenditures                29,564       19,332          453        1,405        50,754

Fiscal 1997
  Outside revenue                $   394,100   $  284,519   $       --   $       --   $   678,619
  Intercompany revenue                24,405      101,295           --     (125,700)           --
  Depreciation and amortization       25,506       27,956           --           44        53,506
  EBITDA before restructuring
    and other non-recurring
    Charges                           31,514      104,023           --      (15,048)      120,489

</TABLE>

       Reconciliation  of  reportable   segment  primary  financial  measure  to
operating income (loss) is as follows ($ in thousands):

<TABLE>
<CAPTION>

                                                                 Year Ended August 31
                                                                 --------------------
                                                           1999          1998           1997
                                                           ----          ----           ----
<S>                                                   <C>           <C>            <C>
Total EBITDA before restructuring and other
  non-recurring charges                               $  480,785    $  279,274     $  120,489
Depreciation and amortization                            136,002        93,051         53,506
Restructuring and other charges                               --        65,831        331,697
                                                      ----------    ----------     -----------
  Operating income (loss)                             $  344,783    $  120,392     $ (264,714)
                                                      ==========    ==========     ===========
</TABLE>

                                       49
<PAGE>

        Information  concerning  principal  geographic areas is as follows ($ in
thousands):

                                        United States      Other       Total
                                        -------------      -----       -----
Fiscal 1999
  Outside revenue                       $  1,481,576   $  204,372   $ 1,685,948
  Net property, plant and equipment        2,384,589      187,431     2,572,020
Fiscal 1998
  Outside revenue                       $  1,006,199   $  179,274   $ 1,185,473
  Net property, plant and equipment        2,458,227      392,275     2,850,502
Fiscal 1997
  Outside revenue                       $    562,469   $  116,150   $   678,619

19.  SUPPLEMENTAL SCHEDULE OF CASH FLOW INFORMATION

        The  supplemental  cash flow  disclosures and non-cash  transactions for
fiscal years 1999, 1998 and 1997 are as follows ($ in thousands):

<TABLE>
<CAPTION>

                                                               Year Ended August 31
                                                               --------------------
                                                          1999           1998        1997
                                                          ----           ----        ----
Supplemental cash flow information:
Cash paid during the year for:
<S>                                                    <C>           <C>           <C>
   Interest                                            $  163,794    $    78,008   $  26,660
                                                       ===========   ============  ==========
   Income taxes paid (refunded)                        $  (22,529)   $     1,253   $     --
                                                       ===========   ============  ==========
Non-cash investing and financing activities:
  Business combinations:
   Fair value of assets acquired                       $       --    $ 2,949,100   $ 495,168
   Fair value of liabilities assumed                           --        966,498     329,134
   Less, cash paid                                             --     (1,295,953)         --
                                                       -----------  -------------  ----------
   Fair value of stock issued on acquisition                   --        686,649   $ 166,034
                                                       ===========  ============   ==========
  Issuance of subordinated convertible debenture
   to Laidlaw Inc.                                     $       --    $        --   $ 350,000
                                                       ===========  ============   ==========
  Issuance of common stock to satisfy interest
   payment due on subordinated convertible debenture   $   22,486    $    17,500   $      --
                                                       ===========   ============  ==========
  Issuance of common stock as consideration for
   repurchase of subordinated convertible debenture    $  150,000    $        --   $      --
                                                       ===========   ============  ==========
  Non-cash transactions arising from sale of
business:
   Promissory notes receivable                         $       --    $     8,000   $      --
   Reduction of debt                                           --         40,814          --
   Equity investment recorded as long-term investment      37,782            --           --
                                                       ============  ============  ==========
</TABLE>

20. RECENT ACCOUNTING DEVELOPMENTS

        In June 1998, FASB issued  Statement No. 133,  "Accounting of Derivative
Instruments and Hedging  Activities,"  ("SFAS 133") (as amended by Statement No.
137 "Accounting for Derivative  Instruments and Hedging Activities - Deferral of
the Effective Date of FASB  Statement No. 133" issued June 1999),  effective for
periods  beginning  after June 15, 2000.  SFAS 133  establishes  accounting  and
reporting  standards for derivative  instruments,  including certain  derivative
instruments  embedded  on other  contracts,  and  derivatives  used for  hedging
purposes.  SFAS 133 requires that entities  recognize all  derivative  financial
instruments  as either assets or  liabilities on the balance sheet at their fair
value.  Changes in the fair value of the derivatives are recorded each period in
current  earnings  or  other  comprehensive  income,   depending  on  whether  a
derivative is designated as part of a hedge transaction,  and if it is, the type
of hedge transaction. The Company anticipates that the adoption of this standard
will not have a significant effect on the Company's results of operations or its
financial position.

                                       50
<PAGE>

        In March 1998, the AICPA issued Statement of Position 98-1.  "Accounting
for Costs of Computer  Software for Internal  Use," ("SOP 98-1"),  effective for
periods  beginning  after  December  15,  1998.  SOP 98-1  provides  guidance on
defining  internal use software and the accounting  for the costs  thereof.  The
Company  anticipates  that  the  adoption  of this  statement  will  not  have a
significant  effect on the  Company's  results of  operations  or its  financial
position.

        In April 1998, the AICPA issued Statement of Position 98-5,  "Accounting
for the Costs of  Start-Up  Activities,"  (SOP  98-5"),  effective  for  periods
beginning  after  December  15,  1998.  SOP 98-5  requires all costs of start-up
activities to be expensed as incurred.  Start-up activities are defined as those
one-time activities related to opening a new facility, introducing a new product
or service,  conducting business in a new territory,  conducting business with a
new class of customer or  beneficiary,  initiating  a new process in an existing
facility,  or  commencing  a new  operation.  Activities  related  to mergers or
acquisitions are not considered  start-up  activities and,  therefore,  SOP 98-5
does not change the accounting for such items. The Company  anticipates that the
adoption of this statement  will not have a significant  effect on the Company's
results of operations or its financial position.

21. QUARTERLY FINANCIAL DATA-UNAUDITED
<TABLE>
<CAPTION>

                                 FIRST *     SECOND     THIRD **       FOURTH *         TOTAL**
                                 -------     ------     --------       --------         -------
                                          ($ in thousands, except per share amounts)

Fiscal 1999
<S>                            <C>         <C>         <C>           <C>            <C>

Revenue                        $ 467,019   $ 402,135   $  400,935    $   415,859    $1,685,948
Income from operations            90,176      73,866       90,111         90,630       344,783
Extraordinary loss, net of
  applicable tax                      --          --           --        (15,036)      (15,036)
Net income                        27,772      18,245       29,694         13,165        88,876
Earnings per share:
  Income before

    extraordinary item

      Basic                    $    0.32  $     0.21   $     0.34    $      0.32     $    1.17
      Diluted                       0.27        0.19         0.30           0.28          1.03
  Net income

      Basic                    $    0.32  $     0.21   $     0.34    $      0.15     $    1.00
      Diluted                       0.27        0.19         0.30    $      0.15          0.90

Fiscal 1998

Revenue                        $ 211,552  $  173,215   $  365,705    $   435,001    $1,185,473
Income (loss) from
  operations                      31,931      19,676      (10,304)        79,089       120,392
Extraordinary loss, net of
  applicable tax                      --          --      (11,283)            --       (11,283)
Net income (loss)                 10,144       3,556      (35,319)        21,824           205
Earnings per share:
  Income (loss) before

    extraordinary item

      Basic                    $    0.22  $     0.08   $    (0.34)   $      0.25     $    0.18
      Diluted                       0.19        0.08        (0.34)          0.22          0.18
  Net income (loss)

      Basic                    $    0.22  $     0.08   $    (0.50)   $      0.25     $      --
      Diluted                       0.19        0.08        (0.50)          0.22            --
</TABLE>

* Includes  revenue from European  operations of $31.7 million and $27.9 million
in first quarter 1998 and fourth quarter 1999, respectively.

** 1998 includes  restructuring  charge of $65.8 million  ($39.5  million net of
tax).

                                       51
<PAGE>

Results for the quarters include the results of operations of acquired companies
for the periods in which they were owned by the Company.

22. SUMMARIZED FINANCIAL INFORMATION

        In connection with the Safety-Kleen acquisition,  Safety-Kleen Services,
Inc.  (formerly known as LES,  Inc.), a wholly-owned  subsidiary of the Company,
issued 9.25% Senior  Subordinated  Notes (See Note 6). The Notes are jointly and
severally guaranteed by the Company and all wholly-owned  domestic  subsidiaries
of the Company, including the wholly-owned domestic subsidiaries of Safety-Kleen
Corp.,  on a full  and  unconditional  basis.  No  foreign  direct  or  indirect
subsidiary or non-wholly-owned domestic subsidiary is an obligor or guarantor on
the financing.  Separate financial  statements and other disclosures  concerning
each of  Safety-Kleen  Services,  Inc.  and the  subsidiary  guarantors  are not
presented  because  management  believes  they are not  material  to  investors.
Summarized  financial  information  for the  Company and its  subsidiaries  on a
combined basis is set forth below.

                      Consolidating Condensed Balance Sheet
                                 August 31, 1999
<TABLE>
<CAPTION>

                                      Safety-Kleen                Subsidiary
                       Safety-Kleen     Services,    Subsidiary    Non-        Elimination   Consolidated
($ in thousands)          Corp.           Inc.       Guarantors   Guarantors     Entries        Totals
                          -----           ----       ----------   ----------     -------        ------
ASSETS
<S>                    <C>            <C>            <C>          <C>          <C>           <C>
Current assets         $    24,956    $        --    $  528,621   $  48,418    $   (14,298)  $   587,697
Property, plant and
  Equipment, net                --             --     2,384,106     187,914             --     2,572,020
Investment in
  Subsidiaries           1,601,498      2,911,631     2,346,621          --     (6,859,750)           --
Goodwill                        --             --     1,042,315      56,416             --     1,098,731
Other non-current
  Assets                        --             --       107,000       1,356             --       108,356
                       -----------    -----------    ----------   ---------    -----------   -----------
   Total assets        $ 1,626,454    $ 2,911,631    $6,408,663   $ 294,104    $(6,874,048)  $ 4,366,804
                       ===========    ===========    ==========   =========    ============  ===========
LIABILITIES
Current liabilities    $     7,189    $   100,208    $  277,455   $  51,165    $   (14,298)  $   421,719
Non-current                     --           --         774,608       5,854             --       780,462
liabilities
Long-term debt             337,013      1,488,126        15,798      41,434             --     1,882,371
                       -----------    -----------    ----------   ---------    -----------   -----------
   Total liabilities       344,202      1,588,334     1,067,861      98,453        (14,298)    3,084,552

STOCKHOLDERS' EQUITY
                         1,282,252      1,323,297     5,340,802     195,651     (6,859,750)    1,282,252
                       -----------    -----------    ----------   ---------    ------------  -----------
Total liabilities and
  stockholders' equity $ 1,626,454    $ 2,911,631    $6,408,663   $ 294,104    $(6,874,048)  $ 4,366,804
                       ===========    ===========    ==========   =========    ============  ===========
</TABLE>


                                       52
<PAGE>

                   Consolidating Condensed Statement of Income
                           Year Ended August 31, 1999
<TABLE>
<CAPTION>

                                      Safety-Kleen                Subsidiary
                       Safety-Kleen     Services,    Subsidiary      Non-      Elimination   Consolidated
($ in thousands)          Corp.           Inc.       Guarantors   Guarantors     Entries        Totals
                          -----           ----       ----------   ----------     -------        ------
<S>                    <C>            <C>            <C>          <C>          <C>           <C>
Total revenue .....    $     --       $     --       $1,434,226   $  264,465   $   (12,743)  $ 1,685,948
Operating expenses            936           --        1,167,318      185,654       (12,743)    1,341,165
                       -----------    -----------    ----------   -----------  ------------    ----------
Operating income ..          (936)          --          266,908       78,811            --       344,783
Interest income
  (expense), net ..       (24,150)      (139,868)         1,223       (3,430)           --      (166,225)
Undistributed
  earnings of
  subsidiaries ....       118,070        197,006          2,708         --        (315,076)        2,708
                       -----------    -----------    -----------  -----------  ------------  -------------
Income (loss) from-
  continuing
  operations before
  income tax ......        92,984         57,138        270,839       75,381      (315,076)      181,266
Income tax expense
  (benefit) .......       (10,928)       (60,932)       117,987       32,438            --        78,565
                       -----------    -----------    -----------  -----------  ------------  ------------
Income (loss) from
  continuing
  operations before
  minority interest       103,912        118,070        152,852       42,943      (315,076)      102,701
Minority interest .          --             --              217          994            --         1,211
                       -----------    -----------     ----------  ----------   ------------  ------------
Income (loss) from
  continuing
  operations ......       103,912        118,070        153,069       43,937      (315,076)      103,912
Extraordinary loss        (15,036)          --             --           --              --       (15,036)
                       -----------     ----------     ----------  ----------    ----------   ------------
Net income ........    $   88,876     $  118,070     $  153,069   $   43,937   $  (315,076)  $    88,876
                       ===========    ===========    ===========  ===========  ============  ============
</TABLE>


                                       53
<PAGE>

                 Consolidating Condensed Statement of Cash Flows
                           Year Ended August 31, 1999

<TABLE>
<CAPTION>
                                      Safety-Kleen                Subsidiary
                       Safety-Kleen     Services,    Subsidiary      Non-      Elimination   Consolidated
($ in thousands)          Corp.           Inc.       Guarantors   Guarantors     Entries        Totals
                          -----           ----       ----------   ----------     -------        ------
<S>                    <C>            <C>           <C>           <C>           <C>           <C>
Net cash provided by
  (used in) operating
  activities           $   (20,642)    $  (141,441)  $  248,694   $ (16,553)   $        --   $    70,058
                       ------------    ------------  ----------  ----------    -----------   -----------
Cash flows from
  investing
  activities:
Cash expended on
  acquisition of
  Business                      --              --      (10,809)       (102)            --       (10,911)
Purchase of
property,
  plant and equipment           --              --      (66,578)     (7,015)            --       (73,593)
Proceeds from sale of
  Business                      --              --      140,401          --             --       140,401
Change in other, net            --              --        3,173         288             --         3,461
                       -----------     -----------   ----------   ---------    -----------   -----------
Net cash (used in)
  investing activities         --              --       66,187      (6,829)            --        59,358
                       -----------     -----------   ----------   ----------   -----------   -----------
Cash flows from
  financing activities:
Exercise of stock
  Options                      212              --           --          --             --           212
Bank financing fees
  and expenses              (8,709)         (4,191)          --          --             --       (12,900)
Borrowings of
  long-term debt           225,000              --           --          --             --       225,000
Repayment of
  long-term debt          (200,000)       (173,832)      (1,050)    (10,412)            --      (385,294)
Bank overdraft                  --          14,298       20,139      16,257        (14,298)       36,396
Intercompany payable
  (receivable)              26,584         305,166     (336,203)      4,453             --            --
                       -----------     -----------   -----------  ---------    -----------   -----------
Net cash provided
  by (used in)
  financing activities      43,087         141,441     (317,114)     10,298        (14,298)     (136,586)
                       -----------     -----------   -----------  ---------    ------------  ------------
Effect of exchange
  rate changes on cash          --              --       (2,110)      2,120             --            10
                       -----------     -----------   -----------  ---------    -----------   -----------
Net increase
  (decrease) in cash
  and cash equivalents      22,445              --       (4,343)    (10,964)       (14,298)       (7,160)
Cash and cash
  equivalents at:
  Beginning of period           --              --        4,343      11,990             --        16,333
                       -----------     -----------   ----------   ---------    -----------   -----------
  End of period        $    22,445     $        --   $       --   $   1,026    $   (14,298)  $     9,173
                       ===========     ===========   ==========   =========    ============  ===========
</TABLE>

                                       54
<PAGE>

                      Consolidating Condensed Balance Sheet
                                 August 31, 1998
<TABLE>
<CAPTION>
                                      Safety-Kleen                Subsidiary
                       Safety-Kleen     Services,    Subsidiary      Non-      Elimination   Consolidated
($ in thousands)          Corp.           Inc.       Guarantors   Guarantors     Entries        Totals
                          -----           ----       ----------   ----------     -------        ------
<S>                    <C>            <C>           <C>           <C>           <C>           <C>
ASSETS
Current assets ......   $      --     $      --     $   431,274   $  111,060    $      --     $   542,334
Property, plant and
  equipment, net ....          --            --       2,454,211      396,331            (40)    2,850,502
Investment in
  subsidiaries ......     1,496,759     2,776,635     1,322,059          166     (5,595,619)         --
Goodwill ............          --            --         951,655       71,499          --        1,023,154
Other non-current
  assets ............          --            --          52,134          771          --           52,905
                        -----------   -----------   -----------   ----------    ------------
   Total assets .....   $ 1,496,759   $ 2,776,635   $ 5,211,333   $  579,827   $ (5,595,659)  $ 4,468,895
                        ===========   ===========   ===========   ==========    ============   ==========

LIABILITIES
 Current liabilities .   $     6,853   $    88,089   $   246,359   $   83,617   $         (2)  $   424,916
Non-current .........          --            --         714,145      111,964          --          826,109
liabilities
Long-term debt ......       125,200     1,661,989        16,334       49,641          --        1,853,164
Subordinated
  convertible
  debenture .........       350,000          --            --           --            --          350,000
                        -----------   -----------   -----------   ----------    ------------  -----------
   Total liabilities        482,053     1,750,078       976,838      245,222             (2)    3,454,189

STOCKHOLDERS'
  EQUITY ............     1,014,706     1,026,557     4,234,495      334,605     (5,595,657)    1,014,706
                        -----------   -----------   -----------   ----------    ------------  -----------
Total liabilities and
  stockholders'
  equity ............   $ 1,496,759   $ 2,776,635   $ 5,211,333      579,827    $(5,595,659)  $ 4,468,895
                        ===========   ===========   ===========   ==========    ============  ===========
</TABLE>


                                       55
<PAGE>

                   Consolidating Condensed Statement of Income
                           Year Ended August 31, 1998

<TABLE>
<CAPTION>
                                      Safety-Kleen                Subsidiary
                       Safety-Kleen     Services,    Subsidiary      Non-      Elimination   Consolidated
($ in thousands)          Corp.           Inc.       Guarantors   Guarantors     Entries        Totals
                          -----           ----       ----------   ----------     -------        ------
<S>                      <C>           <C>           <C>           <C>           <C>           <C>
Total revenue ......     $    --       $    --       $ 947,774     $ 250,814     $ (13,115)   $1,185,473
Operating expenses .          --            --         796,955       215,370       (13,075)      999,250
Restructuring charge          --            --          60,081         5,750          --          65,831
                         ---------     ---------     ---------     ---------     ---------     ---------
Operating income ...          --            --          90,738        29,694           (40)      120,392
Interest income
  (expense), net ...       (25,747)      (79,464)       12,790        (7,619)         --        (100,040)
Undistributed
  earnings of

  Subsidiaries .....        14,366        68,147          --            --         (82,513)         --
                         ---------     ---------     ---------     ---------     ---------     ---------
Income (loss) from
  continuing
  operations before

  income tax .......       (11,381)      (11,317)      103,528        22,075       (82,553)       20,352
Income tax expense

  (benefit) ........       (11,586)      (35,759)       46,164        10,314          --           9,133
                         ---------     ---------     ---------     ---------     ---------     ---------
Income (loss) from
  continuing
  operations before

  minority interest            205        24,442        57,364        11,761       (82,553)       11,219
Minority interest ..          --            --             589          (320)         --             269
                         ---------     ---------     ---------     ---------     ---------     ---------
Income (loss) from
  continuing

  Operations .......           205        24,442        57,953        11,441       (82,553)       11,488
Extraordinary loss,
  net of tax .......          --         (10,076)         --          (1,207)         --         (11,283)
                         ---------     ---------     ---------     ---------     ---------     ---------
Net income .........     $     205     $  14,366     $  57,953     $  10,234     $ (82,553)    $     205
                         =========     =========     =========     =========     =========     =========

</TABLE>


                                       56
<PAGE>

                 Consolidating Condensed Statement of Cash Flows
                           Year Ended August 31, 1998

 <TABLE>
<CAPTION>
                                      Safety-Kleen                Subsidiary
                       Safety-Kleen     Services,    Subsidiary      Non-      Elimination   Consolidated
($ in thousands)          Corp.           Inc.       Guarantors   Guarantors     Entries        Totals
                          -----           ----       ----------   ----------     -------        ------
<S>                      <C>           <C>           <C>             <C>           <C>           <C>
Net cash provided
  by (used in)operating
  activities .........   $   3,612     $ (12,888)    $  76,353     $  20,550     $      --     $    87,627
                         ---------     ----------    ----------    ----------    ----------    ------------
Cash flows from
  investing activities:
Cash acquired on
  acquisition of
  Business ..........           --            --    (1,272,639)       (8,856)           --      (1,281,495)
Purchase of property,
  plant and equipment           --            --       (39,327)      (11,427)           --         (50,754)
Proceeds from sale of
  property, plant and
  Equipment .........           --            --        13,256           177            --          13,433
Proceeds from sale of
  Business ..........           --            --        33,675            --            --          33,675
Change in other, net            --            --        13,046       (21,240)           --          (8,194)
                         ----------  ------------  ------------    ----------    ----------    ------------
Net cash (used in)
  investing activities          --            --    (1,251,989)      (41,346)           --      (1,293,335)
                         ----------  ------------  ------------    ----------    ----------    ------------
Cash flows from
  financing activities:
Exercise of stock
  Options ...........          509            --            --            --            --             509
Bank financing fees
  and expenses ......           --       (48,513)           --        (2,025)           --         (50,538)
Bank overdraft ......           --            --        10,975         2,017            --          12,992
Borrowings of
  long-term debt ....           --     1,788,000            --        68,814            --       1,856,814
Repayment of
  long-term debt ....           --      (331,750)     (212,953)      (59,981)           --        (604,684)
Intercompany payable
  (receivable) ......       (4,121)   (1,394,849)    1,357,187        41,783            --              --
                         ----------  ------------  ------------    ----------    ----------   -------------
Net cash provided
  by (used in) financing
 activities .........       (3,612)       12,888     1,155,209        50,608            --       1,215,093
                         ----------  ------------  ------------    ----------   -----------   ------------
Effect of exchange rate
 changes on cash.....           --            --            --        (4,212)           --          (4,212)
                         ----------  -----------   ------------    ----------   -----------    ------------
Net increase
(decrease) in cash  and
 cash equivalents....           --            --       (20,427)       25,600            --           5,173
Cash and cash
  equivalents at:
  Beginning of period           --            --        24,770       (13,610)           --          11,160
                         ----------  ------------  ------------    ----------    ----------    ------------
  End of period .....    $      --   $        --   $     4,343     $  11,990     $      --     $    16,333
                         ==========  ============  ============    ==========    ==========    ============
</TABLE>


                                       57
<PAGE>

                  Consolidating Condensed Statement of Income
                           Year Ended August 31, 1997

 <TABLE>
<CAPTION>
                                       Safety-Kleen                 Subsidiary
                        Safety-Kleen     Services,    Subsidiary       Non-       Elimination   Consolidated
($ in thousands)           Corp.           Inc.       Guarantors    Guarantors     Entries         Totals
                           -----           ----       ----------    ----------     -------         ------
<S>                      <C>            <C>           <C>            <C>           <C>           <C>
Total revenue .......    $      --      $       --    $  510,563     $ 168,056     $      --     $  678,619
Operating expenses ..           --              --       472,254       139,382            --        611,636
Restructuring charge            --              --       325,070         6,627            --        331,697
                         ----------     -----------   -----------    ----------    ----------    ----------
Operating income ....           --              --      (286,761)       22,047            --       (264,714)
Interest expense, net        6,580           8,010        22,530         4,288            --         41,408
Undistributed losses
  of subsidiaries ...     (179,397)       (174,485)           --            --       353,882             --
                         ----------     -----------   ----------     ----------    ----------    ----------
Income (loss) from
  operations before
  income tax ........     (185,977)       (182,495)     (309,291)       17,759       353,882       (306,122)
Income tax expense
  (benefit) .........       (2,545)         (3,098)     (118,579)        1,433            --       (122,789)
                         ----------     -----------   -----------    ----------    ----------    ----------
Income (loss) from
  continuing
  operations before
  minority interest .     (183,432)       (179,397)     (190,712)       16,326       353,882       (183,333)
Minority interest ...         --                --           (72)          (47)           --           (119)
                         ----------     -----------   -----------    ----------    ----------    ----------
Income (loss) from
  continuing
  operations ........     (183,432)       (179,397)     (190,784)       16,279       353,882       (183,452)
Income from
  discontinued
  operations ........         --                --            20            --            --             20
                         ----------     -----------   -----------    ---------     ----------    -----------
Net income ..........    $(183,432)     $ (179,397)   $ (190,764)     $ 16,279     $ 353,882     $ (183,432)
                         ==========     ===========   ===========    ==========    ==========    ===========
</TABLE>



                                       58
<PAGE>

                Consolidating Condensed Statement of Cash Flows
                           Year Ended August 31, 1997

<TABLE>
<CAPTION>
                                      Safety-Kleen                Subsidiary
                       Safety-Kleen     Services,    Subsidiary      Non-      Elimination   Consolidated
($ in thousands)          Corp.           Inc.       Guarantors   Guarantors     Entries        Totals
                          -----           ----       ----------   ----------     -------        ------
<S>                      <C>            <C>           <C>            <C>           <C>           <C>
Net cash provided by
  (used in) continuing
  Operations ........    $   2,545      $   3,098     $  38,964      $  (7,428)    $    (220) $      36,959
Net cash provided
  by (used in)
  Discontinued
  Operations ........           --             --           425             --            --            425
                         ----------     ----------    ----------     ----------    ----------    -----------
Net cash provided by
  (used in) operating
  Activities ........        2,545          3,098        39,389         (7,428)         (220)        37,384
                         ----------     ----------    ----------     ----------    ----------    -----------
Cash flows from
  investing
activities:
Purchase of property,
  plant and equipment           --             --       (16,154)       (19,943)           --        (36,097)
Other investing
  activities, net ...           --             --        15,648         (1,438)           --         14,210
                         ----------     ---------     ----------     ----------    ----------    -----------
Net cash used in
  continuing
  operations ........           --             --          (506)       (21,381)           --        (21,887)
Net cash used in
  discontinued
  operations ........           --             --        (1,887)            --            --         (1,887)
                         ----------     ----------    ----------     ----------    ----------    -----------
Net cash used in
  investing activities          --             --        (2,393)       (21,381)           --        (23,774)
                         ----------     ----------    ----------     ----------    ----------    -----------
Cash flows from
  financing activities:
Debt financing fees
  and expenses ......           --        (16,448)           --         (2,340)           --        (18,788)
Bank overdraft ......           --             --       (28,829)        (3,359)           --        (32,188)
Repayment of
  long-term debt ....           --             --       (55,700)        (5,842)           --        (61,542)
Borrowings of
  long-term debt ....       65,200        315,000            --         71,422            --        451,622
Intercompany payable
  (receivable) ......      (67,745)      (301,650)      369,175             --           220             --
Net payments to
  Laidlaw Inc. ......           --             --      (296,872)       (44,682)           --       (341,554)
                         ----------     ----------    ----------     ----------    ----------    -----------
Net cash provided by
(used in) Financing
activities...........       (2,545)        (3,098)      (12,226)        15,199           220         (2,450)
                         ----------     ----------    ----------     ----------    ----------    -----------
Net increase
  (decrease) in cash
  and cash equivalents          --             --        24,770        (13,610)           --         11,160
Cash and cash
  Equivalents at:
  Beginning of period           --             --            --             --            --             --
                         ----------     ----------    ----------     ----------    ----------    -----------
  End of period .....    $      --      $      --     $  24,770      $ (13,610)    $      --     $   11,160
                         ==========     ==========    ==========     ==========    ==========    ===========
</TABLE>


                                       59
<PAGE>

ITEM 9.  CHANGES IN AND DISAGREEMENTS WITH ACCOUNTANTS ON ACCOUNTING AND
         FINANCIAL DISCLOSURE


         None.

                                    PART III
                                    --------

ITEM 10.   DIRECTORS AND EXECUTIVE OFFICERS OF THE REGISTRANT

        The section entitled  "Executive  Officers of the Registrant" in Part I,
Item 1 of this  Annual  Report on Form 10-K and the  section  entitled  "Section
16(a) Beneficial  Ownership  Reporting  Compliance" and "Proposal 1: Election of
Directors" in the Company's  definitive  proxy statement to be filed pursuant to
Regulation 14A for the Annual Meeting of Stockholders to be held on November 30,
1999 (the "Proxy Statement"), are incorporated herein by reference.

ITEM 11.   EXECUTIVE COMPENSATION

         The  sections   entitled   "Compensation  of  Executive   Officers  and
Directors" and "Compensation  Committee Interlocks and Insider Participation" in
the Proxy Statement are

incorporated herein by reference.

ITEM 12.   SECURITY OWNERSHIP OF CERTAIN BENEFICIAL OWNERS AND MANAGEMENT

        The section  entitled  "Beneficial  Ownership" in the Proxy Statement is
incorporated herein by reference.

ITEM 13.   CERTAIN RELATIONSHIPS AND RELATED TRANSACTIONS

        The section  entitled  "Compensation  Committee  Interlocks  and Insider
Participation" in the Proxy Statement is incorporated herein by reference.

                                     PART IV

ITEM 14.   EXHIBITS, FINANCIAL STATEMENT SCHEDULES AND REPORTS ON FORM 8-K

(a)  The following documents are filed as part of this report:

   (1) Financial statements and the notes thereto:

       Report of Independent Accountants (page 28).

       Consolidated  Statements of Income for the years ended August 31, 1999,
       1998 and 1997 (page 29).

       Consolidated  Statements  of  Comprehensive  Income for the years ended
       August 31, 1999, 1998 and 1997 (page 29).

       Consolidated Balance Sheets as of August 31, 1999 and 1998 (page 30).

       Consolidated  Statements  of Cash Flows for the years  ended August 31,
       1999, 1998 and 1997 (page 31).

       Consolidated  Statements  of  Stockholders' Equity for the years  ended
       August 31, 1999, 1998 and 1997 (page 32).

       Notes to Consolidated Financial Statements (pages 32-59).


                                       60
<PAGE>

   (2) Financial statement schedule required to be filed by Item 8 of this form:

       Schedule II -- Valuation and qualifying accounts.

       Independent accountant's report on financial statement schedule.

       All other schedules have been omitted since they are inapplicable  or not
required,  or the information  has been included in the financial  statements or
the notes thereto.

       The Company's  1999 Annual  Report to  Stockholders is  not to be  deemed
filed  as part of this  report  except  for  those  parts  thereof  specifically
incorporated by reference herein.

   (3) Exhibits:

(3)(a) Restated  Certificate of  Incorporation of the Company dated May 13, 1997
and  Amendment  to  Certificate  of  Incorporation  dated May 15,  1997 filed as
Exhibit 3(a) to the  Registrant's  Form 10-Q for the Quarter  ended May 31, 1997
and incorporated herein by reference.

(3)(a)(i)  Certificate  of  Correction  Filed to Correct a Certain  Error in the
Restated and Amended  Certificate of  Incorporation of the Company dated October
15, 1997 filed as Exhibit  (3)(a)(i) to the  Registrant's  Form 10-K-405 for the
Year ended August 31, 1997, and incorporated herein by reference.

(3)(a)(ii) Certificate of Amendment to the Restated Certificate of Incorporation
of the  Company  dated  November  25, 1998 filed as Exhibit  (3)(a)(iii)  to the
Registrant's  Form 10-Q for the quarter ended November 30, 1998 and incorporated
herein by reference.

(3)(a)(iii)   Certificate   of  Amendment  to  the   Restated   Certificate   of
Incorporation of the Company dated November 30, 1998 filed as Exhibit (3)(a)(iv)
to the  Registrant's  Form 10-Q for the  quarter  ended  November  30,  1998 and
incorporated herein by reference.

(3)(b) Amended and Restated  Bylaws of the Company filed as Exhibit 4(ii) to the
Registrant's  Current  Report on Form 8-K dated July 29,  1997 and  incorporated
herein by reference.

(4)(a) Indenture dated as of May 29, 1998 between LES, Inc. (a subsidiary of the
Registrant), Registrant, subsidiary guarantors of the Registrant and The Bank of
Nova Scotia Trust  Company of New York,  as trustee filed as Exhibit 4(b) to the
Registrant's  Form S-4 Registration  Statement No. 333-57587 filed June 24, 1998
and incorporated herein by reference.

(4)(b)  First  Supplemental  Indenture  effective  as of November 15, 1998 among
Safety-Kleen Services, Inc. the Registrant, SK Europe, Inc. and The Bank of Nova
Scotia  Trust  Company of New York,  as trustee  filed as Exhibit  (4)(f) to the
Registrant's  Form S-4 Registration  Statement No. 333-82689 filed July 12, 1999
and incorporated herein by reference.

(4)(c)  Indenture  dated as of May 17, 1999 between  Registrant  and the Bank of
Nova Scotia Trust Company of New York, as trustee filed as Exhibit (4)(b) to the
Registrant's  Form S-4 Registration  Statement No. 333-82689 filed July 12, 1999
and incorporated herein by reference.

(4)(d)  Second  Supplemental  Indenture  effective  as  of  May  7,  1999  among
Safety-Kleen  Services,  Inc. the  Registrant,  SK Services,  L.C.,  SK Services
(East), L.C. and The Bank of Nova Scotia Trust Company of New York, as trustee.

(4)(e) Registration Rights Agreement dated as of May 17, 1999 between Registrant
and TD  Securities,  NationsBanc  Montgomery  Securities LLC and Raymond James &
Associates,   Inc.  filed  as  Exhibit  (4)(a)  to  the  Registrant's  Form  S-4
Registration Statement No. 333-82689 filed July 12, 1999 and incorporated herein
by reference.

(4)(f) Amended and Restated  Credit  Agreement among Laidlaw  Chem-Waste,  Inc.,
Laidlaw Environmental Services (Canada) Ltd., Toronto Dominion (Texas) Inc., The
Toronto-Dominion  Bank,  TD  Securities  (USA)  Inc.,  The Bank of

                                       61
<PAGE>

Nova  Scotia,  NationsBank,  N.A.  and The First  National  Bank of Chicago  and
NationsBank,  N.A.  as  Syndication  Agent  dated as of April 3, 1998,  filed as
Exhibit 4(f) to the  Registrant's  Form 10-Q for the quarter ended  February 28,
1999, and incorporated herein by reference.

(4)(g)  Supplement to the Amended and Restated  Credit  Agreement  among Laidlaw
Chem-Waste, Inc., Laidlaw Environmental Services (Canada) Ltd., Toronto Dominion
(Texas) Inc., The  Toronto-Dominion  Bank, TD Securities (USA) Inc., The Bank of
Nova  Scotia,  NationsBank,  N.A.  and The First  National  Bank of Chicago  and
NationsBank,  N.A.  as  Syndication  Agent  dated as of April 3, 1998,  filed as
Exhibit 4(e) to a subsidiary of the Registrant's Form S-4 Registration Statement
No. 333-57587 filed June 24, 1998 and incorporated herein by reference.

(4)(h) Waiver and First Amendment to the Amended and Restated  Credit  Agreement
dated  as of May 15,  1998  among  LES,  Inc.,  Laidlaw  Environmental  Services
(Canada) Ltd., the Lenders, Toronto Dominion (Texas), Inc., The Toronto Dominion
Bank, TD Securities (USA) Inc., The Bank of Nova Scotia, NationsBank,  N.A., The
First  National  Bank of Chicago and  Wachovia  Bank filed as Exhibit  4(f) to a
subsidiary of the  Registrant's  Form S-4  Registration  Statement No. 333-57587
filed June 24, 1998 and incorporated herein by reference.

(4)(i)  Commitment  to Increase  Supplement  to the Amended and Restated  Credit
Agreement  dated as of June 3,  1998  among  LES,  Inc.,  Laidlaw  Environmental
Services (Canada) Ltd., the Lenders, Toronto Dominion (Texas), Inc., The Toronto
Dominion Bank, TD Securities  (USA) Inc., The Bank of Nova Scotia,  NationsBank,
N.A., The First National Bank of Chicago and Wachovia Bank filed as Exhibit 4(g)
to a  subsidiary  of  the  Registrant's  Form  S-4  Registration  Statement  No.
333-57587 filed June 24, 1998 and incorporated herein by reference.

(4)(j) Second Amendment to the Amended and Restated Credit Agreement dated as of
November 20, 1998 among  Safety-Kleen  Services,  Inc.  (formerly  known as LES,
Inc.),   Safety-Kleen   Services  (Canada)  Ltd.   (formerly  known  as  Laidlaw
Environmental  Services  (Canada) Ltd.), the Lenders,  Toronto Dominion (Texas),
Inc.,  The Toronto  Dominion  Bank, TD Securities  (USA) Inc.,  The Bank of Nova
Scotia, NationsBank,  N.A., The First National Bank of Chicago and Wachovia Bank
N.A.,  filed as Exhibit  (4)(j) to the  Registrant's  Form 10-Q for the  quarter
ended February 28, 1999 and incorporated herein by reference.

(4)(k) Waiver and Third Amendment to the Amended and Restated  Credit  Agreement
dated as of May 6, 1999 among  Safety-Kleen  Services,  Inc.  (formerly known as
LES,  Inc.),  Safety-Kleen  Services  (Canada) Ltd.  (formerly  known as Laidlaw
Environmental  Services  (Canada) Ltd.), the Lenders,  Toronto Dominion (Texas),
Inc.,  The Toronto  Dominion  Bank, TD Securities  (USA) Inc.,  The Bank of Nova
Scotia, NationsBank,  N.A., The First National Bank of Chicago and Wachovia Bank
N.A. filed as Exhibit (4)(l) to the Registrant's Form S-4 Registration Statement
No. 333-82689 filed July 12, 1999 and incorporated herein by reference.

(4)(l)  Registration  Rights  Agreement  dated May 15, 1997 between  Registrant,
Laidlaw  Transportation,  Inc.  and Laidlaw  Inc. the form of which was filed as
Exhibit B to Annex A to the Registrant's  Definitive Proxy Statement on Form DEF
14A, filed on May 1, 1997 and incorporated herein by reference.

(4)(m)  Indenture  dated as of May 1, 1993  between the  Industrial  Development
Board  of  the   Metropolitan   Government  of  Nashville  and  Davidson  County
(Tennessee)  and  NationsBank of Tennessee,  N.A.,  filed as Exhibit 4(f) to the
Registrant's  Form 10-Q for the Quarter  ended May 31,  1997,  and  incorporated
herein by reference.

(4)(n) Indenture of Trust dated as of August 1, 1995 between Tooele County, Utah
and West One Bank,  Utah, now known as U.S.  Bank, as Trustee,  filed as Exhibit
4(h) to the  Registrant's  form 10-Q for the  Quarter  ended May 31,  1997,  and
incorporated herein by reference.

(4)(o)  Indenture of Trust dated as of July 1, 1997 between Carbon County,  Utah
and U.S. Bank, a national banking association, as Trustee, filed as Exhibit 4(i)
to the  Registrant's  Form  10-Q  for  the  Quarter  ended  May  31,  1997,  and
incorporated herein by reference.

(4)(p)  Indenture of Trust dated as of July 1, 1997 between Tooele County,  Utah
and U.S. Bank, a national banking association, as Trustee, filed as Exhibit 4(j)
to the  Registrant's  Form  10-Q  for  the  Quarter  ended  May  31,  1997,  and
incorporated herein by reference.

                                       62
<PAGE>

(4)(q) Indenture of Trust dated as of July 1, 1997 between California  Pollution
Control Financing  Authority and U.S. Bank, a national banking  association,  as
Trustee,  filed as Exhibit  4(k) to the  Registrant's  Form 10-Q for the Quarter
ended May 31, 1997, and incorporated herein by reference.

(4)(r) Promissory Note dated May 15, 1997 for $60,000,000 from the Registrant to
Westinghouse  Electric  Corporation,  filed as Exhibit 4(n) to the  Registrant's
Form  10-Q for the  Quarter  ended  May 31,  1997,  and  incorporated  herein by
reference.

(4)(s) Letter dated May 7, 1999 from Toronto-Dominion  (Texas) Inc. (as assignee
of  Westinghouse  Electric  Corporation)  and  agreed to by the  Registrant  and
Laidlaw Inc.  amending the terms of the  Promissory  Note dated May 15, 1997 (as
referenced in Exhibit (4)(r)) filed as Exhibit (4)(u) to the  Registrant's  Form
S-4  Registration  Statement No.  333-82689 filed July 12, 1999 and incorporated
herein by reference.

(4)(t)  Guaranty  Agreement  dated May 15, 1997 by Laidlaw Inc. to  Westinghouse
Electric  Corporation  guaranteeing  Promissory  Note  dated  May 15,  1997  (as
referenced  in  Exhibit  (4)(s))  from   Registrant  to  Westinghouse   Electric
Corporation),  filed  as  Exhibit  4(o) to the  Registrant's  Form  10-Q for the
Quarter ended May 31, 1997, and incorporated herein by reference.

(4)(u) Collateral Account Pledge and Security Agreement dated as of May 17, 1999
between the  Registrant,  the Bank of Nova Scotia Trust  Company of New York, as
escrow agent and the Bank of Nova Scotia Trust  Company of New York, as trustee,
filed as Exhibit (4)(d) to the Registrant's Form S-4 Registration  Statement No.
333-82689 filed July 12, 1999 and incorporated herein by reference.

(4)(v) Other instruments defining the rights of holders of nonregistered debt of
the  Registrant  have been  omitted from this exhibit list because the amount of
debt  authorized  under any such  instrument  does not  exceed  10% of the total
assets of the Registrant and its subsidiaries.  The Registrant agrees to furnish
a copy of any such instrument to the Commission upon request.

(10)(a)  Agreement  and Plan of Merger  dated as of March 16,  1998 by and among
Registrant, LES Acquisition, Inc., and Safety-Kleen Corp. included as Annex A of
Safety-Kleen's  Revised Amended  Prospectus on Form 14D-9 filed as Exhibit 62 to
Safety-Kleen's  Amendment  No.  28 to  Schedule  14-9A on March  17,  1998,  and
incorporated herein by reference.

(10)(b) Stock  Purchase  Agreement  between  Westinghouse  Electric  Corporation
(Seller) and Rollins Environmental Services, Inc. (Buyer) for National Electric,
Inc. dated March 7, 1995 filed as Exhibit 2 to the  Registrant's  Current Report
on Form 8-K filed on June 13, 1995 and incorporated herein by reference.

(10)(c) Second  Amendment to Stock Purchase  Agreement (as referenced in Exhibit
(10)(b)  above),  dated May 15, 1997 among  Westinghouse  Electric  Corporation,
Rollins Environmental  Services, Inc. and Laidlaw Inc., filed as Exhibit 4(m) to
the Registrant's  Form 10-Q for the Quarter ended May 31, 1997, and incorporated
herein by reference.

(10)(d) Rollins  Environmental  Services,  Inc. 1982 Incentive Stock Option Plan
filed with Amendment No. 1 to the Company's  Registration  Statement No. 2-84139
on Form S-1 dated June 24, 1983 and incorporated herein by reference.

(10)(e) Rollins Environmental  Services,  Inc. 1993 Stock Option Plan filed with
the  Company's  Proxy  Statement  for the Annual  Meeting of  Shareholders  held
January 28, 1994 and incorporated herein by reference.

(10)(f)  Registrant's  1997  Stock  Option  Plan,  filed as  Exhibit  4.4 to the
Company's  Registration  Statement No.  333-41859 on Form S-8 dated December 10,
1997 and incorporated herein by reference.

(10)(g)  Registrant's  Director's Stock Option Plan, filed as Exhibit 4.5 to the
Company's  Registration  Statement No.  333-41859 on Form S-8 dated December 10,
1997 and incorporated herein by reference.

                                       63
<PAGE>

(10)(h) Stock Purchase  Agreement  dated February 6, 1997 among the  Registrant,
Laidlaw Inc., and Laidlaw Transportation,  Inc. filed as Exhibit A to Annex A to
the  Definitive  Proxy  Statement  on Form  DEF 14A  filed  on May 1,  1997  and
incorporated herein by reference.

(10)(i) Corporate  Incentive Plan for fiscal year 1999, filed as Exhibit (10)(i)
to the  Registrant's  Form 10-Q for the  quarter  ended  November  30,  1998 and
incorporated herein by reference.

(10)(j)  Operations  Management  Incentive  Plan for  fiscal  year 1999 filed as
Exhibit (10)(j) to the Registrant's Form 10-Q for the quarter ended November 30,
1998 and incorporated herein by reference.

(10)(k)  Registrant's  U.S.  Supplemental  Executive  Retirement  Plan  filed as
Exhibit 10(g) to the Registrant's  10-Q for the quarter ended November 30, 1997,
and incorporated herein by reference.

(10)(l) Form of Change of Control  Agreement  LES-A1,  filed as Exhibit 10(k) to
the  Registrant's  10-K for the year ended  August 31,  1998,  and  incorporated
herein by reference.

(10)(m) Form of Change of Control  Agreement  LES-B1,  filed as Exhibit 10(l) to
the  Registrant's  10-K for the year ended  August 31,  1998,  and  incorporated
herein by reference.

(10)(n) Form of Change of Control  Agreement  LES-C1,  filed as Exhibit 10(m) to
the  Registrant's  10-K for the year ended  August 31,  1998,  and  incorporated
herein by reference.

(12)    Statement Re: Computation of Ratios.

(13)    1999 Annual Report to Stockholders

(21)    Subsidiaries of Registrant.

(23)    Consent of Independent Accountants.

(24)    Power of Attorney (on the signature pages hereof)

(27)    Financial Data Schedule.

(b)            Reports on Form 8-K.

         i.       The  Company  filed a  Current  Report on Form 8-K on July 30,
                  1999, which contained Item 5 related to the Company announcing
                  that it would hold a special meeting of shareholders.

         ii.      The Company  filed a Current  Report on Form 8-K on August 27,
                  1999 which contained Item 5 related to the Company  announcing
                  that its  stockholders  had  approved  the  issuance of Common
                  Stock in connection with the repurchase of the $350 million 5%
                  subordinated  convertible  pay-in-kind  debenture from Laidlaw
                  Inc.

         iii.     The Company  filed a Current  Report on Form 8-K on August 27,
                  1999 which contained Item 5 related to the Company  announcing
                  its agreement to acquire Ecogard, Inc. d/b/a First Recovery.


                                       64
<PAGE>

                                   SIGNATURES

        Pursuant to the  requirements  of Section 13 or 15(d) of the  Securities
Exchange Act of 1934, the Registrant has duly caused this report to be signed on
its behalf by the undersigned, thereunto duly authorized.

DATE:                               SAFETY-KLEEN CORP.
October 18, 1999
                         ----------------------------------------------------
                                       (Registrant)

                                    /s/ K. W. Winger

                                   ------------------------------------
                                   Kenneth W. Winger
                                   President and Chief Executive Officer


KNOW ALL MEN BY THESE  PRESENTS,  that each individual  whose signature  appears
below hereby  constitutes and appoints Paul R. Humphreys and Henry H. Taylor and
each of them, his or her true and lawful agent, proxy and attorney-in-fact, each
acting alone,  with full power and substitution and  resubstitution,  for him or
her and in his or her name,  place and stead,  in any and all  capacities to (i)
act on, sign and file with the  Securities  and Exchange  Commission any and all
amendments to this Form 10-K  together with all schedules and exhibits  thereto,
(ii) act on, sign and file such certificates,  instruments, agreements and other
documents as may be necessary or appropriate in connection therewith, (iii) take
any  and all  actions  which  may be  necessary  or  appropriate  in  connection
therewith, granting unto such agents, proxies and attorneys-in-fact, and each of
them,  full power and  authority  to do and perform each and every act and thing
necessary or  appropriate  to be done, as fully and for all intents and purposes
as he or she  might or could  do in  person,  hereby  approving,  ratifying  and
confirming all that such agents, proxies and  attorneys-in-fact,  any of them or
any of his or her or their  substitutes  may  lawfully do or cause to be done by
virtue thereof.

        Pursuant to the  requirements  of the  Securities  Exchange Act of 1934,
this  report has been  signed  below by the  following  persons on behalf of the
Registrant and in the capacities and on the dates indicated.

Signature                       Title                            Date

/s/ J. R. Bullock               Chairman of the  Board           October 5, 1999
- -----------------               and Director
James R. Bullock

/s/ Kenneth W. Winger           President, Chief Executive       October 5, 1999
- ---------------------           Officer and Director
Kenneth W. Winger               (principal executive officer)


/s/ Paul R. Humphreys           Senior Vice President, Finance   October 5, 1999
- ---------------------           and Chief FinancialOfficer
Paul R. Humphreys               (principal financial and
                                accounting officer)


/s/ L. W. Haworth               Director                         October 5, 1999
- -----------------
Leslie W. Haworth


/s/ Robert W. Luba              Director                         October 5, 1999
- ------------------
Robert W. Luba

                                       65
<PAGE>

/s/ John W. Rollins, Sr.        Director                         October 5, 1999
- -----------------------
John W. Rollins, Sr.


/s/ John W. Rollins, Jr.        Director                         October 5, 1999
- ------------------------
John W. Rollins, Jr.


/s/ David E. Thomas, Jr.        Director                         October 5, 1999
- ------------------------
David E. Thomas, Jr.


/s/ Henry B. Tippie             Director                         October 5, 1999
- -------------------
Henry B. Tippie


/s/ James L. Wareham            Director                         October 5, 1999
- --------------------
James L. Wareham


/s/ Grover C. Wrenn             Director                         October 5, 1999
- -------------------
Grover C. Wrenn

                                       66
<PAGE>

                              EXHIBIT INDEX

(3)(a)                   Restated  Certificate of  Incorporation  of the Company
                         dated May 13,  1997 and  Amendment  to  Certificate  of
                         Incorporation  dated May 15, 1997 filed as Exhibit 3(a)
                         to the Registrant's Form 10-Q for the Quarter ended May
                         31, 1997 and incorporated herein by reference.

(3)(a)(i)                Certificate  of  Correction  Filed to Correct a Certain
                         Error  in  the  Restated  and  Amended  Certificate  of
                         Incorporation  of the  Company  dated  October 15, 1997
                         filed as Exhibit  (3)(a)(i)  to the  Registrant's  Form
                         10-K-405  for the  Year  ended  August  31,  1997,  and
                         incorporated herein by reference.

(3)(a)(ii)               Certificate of Amendment to the Restated Certificate of
                         Incorporation of  the Company dated  November 25,  1998
                         filed as Exhibit (3) (a) (iii) to the Registrant's Form
                         10-Q for  the  quarter  ended  November  30,  1998  and
                         incorporated herein by reference.

(3)(a)(iii)              Certificate of Amendment to the Restated Certificate of
                         Incorporation  of the Company  dated  November 30, 1998
                         filed as Exhibit  (3)(a)(iv) to the  Registrant's  Form
                         10-Q  for  the  quarter  ended  November  30, 1998  and
                         incorporated herein by reference.

(3)(b)                   Amended and  Restated  Bylaws of the  Company  filed as
                         Exhibit  4(ii) to the  Registrant's  Current  Report on
                         Form 8-K dated July 29, 1997 and incorporated herein by
                         reference.

(4)(a)                   Indenture dated as of May 29, 1998 between LES, Inc. (a
                         subsidiary of the Registrant),  Registrant,  subsidiary
                         guarantors  of the  Registrant  and  The  Bank  of Nova
                         Scotia Trust  Company of New York,  as trustee filed as
                         Exhibit 4(b) to the Registrant's  Form S-4 Registration
                         Statement  No.   333-57587  filed  June  24,  1998  and
                         incorporated herein by reference.

(4)(b)                   First Supplemental  Indenture  effective as of November
                         15,  1998  among   Safety-Kleen   Services,   Inc.  the
                         Registrant, SK Europe, Inc. and The Bank of Nova Scotia
                         Trust  Company of New York, as trustee filed as Exhibit
                         (4)(f)  to  the  Registrant's   Form  S-4  Registration
                         Statement  No.   333-82689  filed  July  12,  1999  and
                         incorporated herein by reference.


(4)(c)                   Indenture dated as of May 17, 1999  between  Registrant
                         and the Bank of Nova Scotia Trust  Company of New York,
                         as trustee filed as Exhibit (4)(b) to the  Registrant's
                         Form S-4 Registration Statement No.333-82689 filed July
                         12, 1999 and  incorporated  herein by reference.

(4)(d)                   Second  Supplemental Indenture  effective  as of May 7,
                         1999 among Safety-Kleen Services,  Inc. the Registrant,
                         SK Services, L.C., SK Services(East), L.C. and The Bank
                         of Nova Scotia Trust Company of New York, as trustee.

(4)(e)                   Registration  Rights Agreement dated as of May 17, 1999
                         between  Registrant  and  TD  Securities,   NationsBanc
                         Montgomery   Securities   LLC  and   Raymond   James  &
                         Associates,   Inc.  filed  as  Exhibit  (4)(a)  to  the
                         Registrant's   Form  S-4  Registration   Statement  No.
                         333-82689 filed July 12, 1999 and  incorporated  herein
                         by reference.

(4)(f)                   Amended and Restated  Credit  Agreement  among  Laidlaw
                         Chem-Waste,   Inc.,  Laidlaw   Environmental   Services
                         (Canada)  Ltd.,  Toronto  Dominion  (Texas)  Inc.,  The
                         Toronto-Dominion  Bank, TD Securities  (USA) Inc.,  The
                         Bank of Nova  Scotia,  NationsBank,  N.A. and The First
                         National  Bank of  Chicago  and  NationsBank,  N.A.  as
                         Syndication  Agent dated as of April 3, 1998,  filed as
                         Exhibit  4(f) to the  Registrant's  Form  10-Q  for the
                         quarter  ended  February  28,  1999,  and  incorporated
                         herein by reference.

(4)(g)                   Supplement to the Amended and Restated Credit Agreement
                         among Laidlaw Chem-Waste,  Inc., Laidlaw  Environmental
                         Services (Canada) Ltd.,  Toronto Dominion (Texas) Inc.,
                         The  Toronto-Dominion  Bank, TD Securities  (USA) Inc.,
                         The  Bank of Nova  Scotia,  NationsBank,  N.A.  and The
                         First National Bank of Chicago and NationsBank, N.A. as
                         Syndication  Agent dated as of

                                       67
<PAGE>

                         April 3, 1998, filed as Exhibit 4(e) to a subsidiary of
                         the  Registrant's  Form S-4 Registration  Statement No.
                         333-57587  filed  June 24, 1998 and incorporated herein
                         by reference.

(4)(h)                   Waiver and First  Amendment to the Amended and Restated
                         Credit  Agreement  dated as of May 15,  1998 among LES,
                         Inc., Laidlaw Environmental Services (Canada) Ltd., the
                         Lenders,  Toronto Dominion  (Texas),  Inc., The Toronto
                         Dominion  Bank, TD Securities  (USA) Inc.,  The Bank of
                         Nova Scotia, NationsBank, N.A., The First National Bank
                         of Chicago and Wachovia Bank filed as Exhibit 4(f) to a
                         subsidiary of the  Registrant's  Form S-4  Registration
                         Statement  No.   333-57587  filed  June  24,  1998  and
                         incorporated herein by reference.

(4)(i)                   Commitment  to Increase  Supplement  to the Amended and
                         Restated  Credit  Agreement  dated  as of June 3,  1998
                         among  LES,  Inc.,   Laidlaw   Environmental   Services
                         (Canada) Ltd., the Lenders,  Toronto Dominion  (Texas),
                         Inc., The Toronto  Dominion  Bank, TD Securities  (USA)
                         Inc., The Bank of Nova Scotia,  NationsBank,  N.A., The
                         First  National Bank of Chicago and Wachovia Bank filed
                         as Exhibit  4(g) to a  subsidiary  of the  Registrant's
                         Form S-4  Registration  Statement No.  333-57587  filed
                         June 24, 1998 and incorporated herein by reference.

(4)(j)                   Second  Amendment  to the Amended and  Restated  Credit
                         Agreement   dated  as  of   November   20,  1998  among
                         Safety-Kleen  Services,  Inc.  (formerly  known as LES,
                         Inc.),  Safety-Kleen  Services (Canada) Ltd.  (formerly
                         known as Laidlaw Environmental Services (Canada) Ltd.),
                         the  Lenders,   Toronto  Dominion  (Texas),  Inc.,  The
                         Toronto  Dominion  Bank, TD Securities  (USA) Inc., The
                         Bank of  Nova  Scotia,  NationsBank,  N.A.,  The  First
                         National Bank of Chicago and Wachovia Bank N.A.,  filed
                         as Exhibit (4)(j) to the Registrant's Form 10-Q for the
                         quarter ended February 28, 1999 and incorporated herein
                         by reference.

(4)(k)                   Waiver and Third  Amendment to the Amended and Restated
                         Credit   Agreement  dated  as  of  May  6,  1999  among
                         Safety-Kleen  Services,  Inc.  (formerly  known as LES,
                         Inc.),  Safety-Kleen  Services (Canada) Ltd.  (formerly
                         known as Laidlaw Environmental Services (Canada) Ltd.),
                         the  Lenders,   Toronto  Dominion  (Texas),  Inc.,  The
                         Toronto  Dominion  Bank, TD Securities  (USA) Inc., The
                         Bank of  Nova  Scotia,  NationsBank,  N.A.,  The  First
                         National Bank of Chicago and Wachovia  Bank N.A.  filed
                         as  Exhibit  (4)(l)  to  the   Registrant's   Form  S-4
                         Registration  Statement  No.  333-82689  filed July 12,
                         1999 and incorporated herein by reference.

  (4)(l)                 Registration Rights Agreement dated May 15,1997 between
                         Registrant,  Laidlaw  Transportation,  Inc. and Laidlaw
                         Inc the form of which was filed as Exhibit B to Annex A
                         to the  Registrant's Definitive Proxy Statement on Form
                         DEF 14A, filed  on May 1, 1997 and  incorporated herein
                         by reference.

(4)(m)                   Indenture   dated  as  of  May  1,  1993   between  the
                         Industrial   Development   Board  of  the  Metropolitan
                         Government of Nashville and Davidson County (Tennessee)
                         and  NationsBank of Tennessee,  N.A.,  filed as Exhibit
                         4(f) to the  Registrant's  Form  10-Q  for the  Quarter
                         ended  May  31,  1997,  and   incorporated   herein  by
                         reference.

(4)(n)                   Indenture  of Trust  dated as of August 1, 1995 between
                         Tooele County, Utah and West One Bank,  Utah, now known
                         as U.S.  Bank, as Trustee, filed as Exhibit 4(h) to the
                         Registrant's  form  10-Q for the Quarter  ended May 31,
                         1997, and incorporated herein by reference.

(4)(o)                   Indenture  of Trust  dated as of July 1,  1997  between
                         Carbon County,  Utah and U.S. Bank, a national  banking
                         association,  as Trustee,  filed as Exhibit 4(i) to the
                         Registrant's  Form 10-Q for the  Quarter  ended May 31,
                         1997, and incorporated herein by reference.

(4)(p)                   Indenture  of Trust  dated as of July 1,  1997  between
                         Tooele County,  Utah and U.S. Bank, a national  banking
                         association,  as Trustee,  filed as Exhibit 4(j) to the
                         Registrant's  Form 10-Q for the  Quarter  ended May 31,
                         1997, and incorporated herein by reference.


                                       68
<PAGE>

(4)(q)                   Indenture  of  Trust dated as of July 1,  1997  between
                         California Pollution  Control  Financing  Authority and
                         U.S. Bank, a national banking  association, as Trustee,
                         filed as Exhibit 4(k) to the Registrant's Form 10-Q for
                         the Quarter ended May 31, 1997, and incorporated herein
                         by reference.

 (4)(r)                  Promissory Note dated May 15, 1997 for $60,000,000 from
                         the  Registrant to  Westinghouse Electric  Corporation,
                         filed as Exhibit 4(n) to the Registrant's Form 10-Q for
                         the Quarter ended May 31, 1997, and incorporated herein
                         by reference.

(4)(s)                   Letter dated May 7, 1999 from Toronto-Dominion  (Texas)
                         Inc. (as assignee of Westinghouse Electric Corporation)
                         and  agreed  to by  the  Registrant  and  Laidlaw  Inc.
                         amending the terms of the Promissory Note dated May 15,
                         1997 (as referenced in Exhibit (4)(r)) filed as Exhibit
                         (4)(u)  to  the  Registrant's   Form  S-4  Registration
                         Statement  No.   333-82689  filed  July  12,  1999  and
                         incorporated herein by reference.

(4)(t)                   Guaranty  Agreement  dated May 15, 1997 by Laidlaw Inc.
                         to  Westinghouse   Electric  Corporation   guaranteeing
                         Promissory  Note dated May 15, 1997 (as  referenced  in
                         Exhibit   (4)(s))  from   Registrant  to   Westinghouse
                         Electric  Corporation),  filed as  Exhibit  4(o) to the
                         Registrant's  Form 10-Q for the  Quarter  ended May 31,
                         1997, and incorporated herein by reference.

(4)(u)                   Collateral  Account Pledge and Security Agreement dated
                         as of May 17, 1999 between the Registrant,  the Bank of
                         Nova Scotia Trust  Company of New York, as escrow agent
                         and the Bank of Nova Scotia Trust  Company of New York,
                         as trustee, filed as Exhibit (4)(d) to the Registrant's
                         Form S-4  Registration  Statement No.  333-82689  filed
                         July 12, 1999 and incorporated herein by reference.

(4)(v)                   Other  instruments  defining  the  rights of holders of
                         nonregistered  debt of the Registrant have been omitted
                         from  this  exhibit  list  because  the  amount of debt
                         authorized  under any such  instrument  does not exceed
                         10% of the  total  assets  of the  Registrant  and  its
                         subsidiaries.  The Registrant  agrees to furnish a copy
                         of any such instrument to the Commission upon request.

(10)(a)                  Agreement and Plan of Merger dated as of March 16, 1998
                         by and among  Registrant,  LES  Acquisition,  Inc., and
                         Safety-Kleen    Corp.    included   as   Annex   A   of
                         Safety-Kleen's Revised Amended Prospectus on Form 14D-9
                         filed as Exhibit 62 to Safety-Kleen's  Amendment No. 28
                         to Schedule 14-9A on March 17, 1998,  and  incorporated
                         herein by reference.

(10)(b)                  Stock Purchase Agreement between Westinghouse  Electric
                         Corporation   (Seller)   and   Rollins    Environmental
                         Services,  Inc.  (Buyer) for  National  Electric,  Inc.
                         dated   March  7,  1995  filed  as  Exhibit  2  to  the
                         Registrant's  Current  Report on Form 8-K filed on June
                         13, 1995 and incorporated herein by reference.

(10)(c)                  Second  Amendment  to  Stock  Purchase   Agreement  (as
                         referenced in Exhibit(10)(b) above), dated May 15, 1997
                         among   Westinghouse  Electric   Corporation,   Rollins
                         Environmental Services, Inc. and Laidlaw Inc., filed as
                         Exhibit 4(m)  to the  Registrant's  Form  10-Q  for the
                         Quarter ended May 31, 1997, and incorporated  herein by
                         reference.

(10)(d)                  Rollins  Environmental  Services,  Inc. 1982  Incentive
                         Stock  Option  Plan filed with  Amendment  No. 1 to the
                         Company's Registration Statement No.2-84139 on Form S-1
                         dated  June  24,  1983  and   incorporated   herein  by
                         reference.

(10)(e)                  Rollins Environmental Services,  Inc. 1993 Stock Option
                         Plan filed with the Company's  Proxy  Statement for the
                         Annual Meeting  of Shareholders  held  January 28, 1994
                         and incorporated herein by reference.

                                       69
<PAGE>


(10)(f)                  Registrant's 1997 Stock Option  Plan,  filed as Exhibit
                         4.4  to  the  Company's   Registration   Statement  No.
                         333-41859 on Form  S-8  dated  December  10,  1997  and
                         incorporated herein by reference.

(10)(g)                  Registrant's Director's  Stock  Option  Plan,  filed as
                         Exhibit 4.5 to the Company's Registration Statement No.
                         333-41859  on  Form  S-8  dated   December 10, 1997 and
                         incorporated herein by reference.

(10)(h)                  Stock Purchase  Agreement  dated February 6, 1997 among
                         the    Registrant,    Laidlaw    Inc.,    and   Laidlaw
                         Transportation,  Inc.  filed as Exhibit A to Annex A to
                         the Definitive Proxy Statement on Form DEF 14A filed on
                         May 1, 1997 and incorporated herein by reference.

(10)(i)                  Corporate Incentive Plan for fiscal year 1999, filed as
                         Exhibit (10)(i) to the  Registrant's  Form 10-Q for the
                         quarter ended November 30, 1998 and incorporated herein
                         by reference.

(10)(j)                  Operations  Management  Incentive Plan for fiscal  year
                         1999 filed as Exhibit (10)(j) to the Registrant's  Form
                         10-Q  for  the  quarter  ended  November 30,  1998  and
                         incorporated herein by reference.

(10)(k)                  Registrant's U.S.Supplemental Executive Retirement Plan
                         filed as Exhibit 10(g) to the Registrant's 10-Q for the
                         quarter ended November 30,1997, and incorporated herein
                         by reference.

(10)(l)                  Form of Change of Control  Agreement  LES-A1,  filed as
                         Exhibit  10(k) to the  Registrant's  10-K  for the year
                         ended  August  31, 1998,  and  incorporated  herein  by
                         reference.

(10)(m)                  Form of Change of Control  Agreement LES-B-1,  filed as
                         Exhibit  10(l) to the  Registrant's  10-K  for the year
                         ended  August 31,  1998,  and  incorporated  herein  by
                         reference.

(10)(n)                  Form of Change of Control  Agreement  LES-C1,  filed as
                         Exhibit  10(m) to the  Registrant's  10-K  for the year
                         ended  August 31,  1998,  and  incorporated  herein  by
                         reference.

(12)                     Statement Re: Computation of Ratios.

(13)                     1999 Annual Report to Stockholders

(21)                     Subsidiaries of Registrant.

(23)                     Consent of Independent Accountants.

(24)                     Power of Attorney (on the signature pages hereof)

(27)                     Financial Data Schedule.

(b)                      Reports on Form 8-K.

                         i.   The Company filed a Current  Report on Form 8-K on
                              July 30, 1999,  which  contained Item 5 related to
                              the  Company  announcing  that  it  would  hold  a
                              special meeting of shareholders.

                         ii.  The Company filed a Current  Report on Form 8-K on
                              August 27, 1999 which  contained Item 5 related to
                              the Company  announcing that its  stockholders had
                              approved   the   issuance   of  Common   Stock  in
                              connection with the repurchase of the $350 million
                              5% subordinated  convertible pay-in-kind debenture
                              from Laidlaw Inc.

                         iii. The Company filed a Current  Report on Form 8-K on
                              August 27, 1999 which  contained Item 5 related to
                              the Company  announcing  its  agreement to acquire
                              Ecogard, Inc. d/b/a First Recovery.


                                       70




       THIS SECOND  SUPPLEMENTAL  INDENTURE,  effective as of May 7, 1999, among
Safety-Kleen  Services,  Inc. (formerly LES, Inc.), a Delaware  corporation (the
"Company"),  Safety-Kleen Corp. (formerly Laidlaw Environmental Services, Inc.),
a  Delaware  corporation  (the  "Parent  Guarantor"),  SK  Services,  L.C.  ("SK
Services") and SK Services (East),  L.C. ("SK Services East"),  both SK Services
and SK Services East are Utah limited liability companies,  and The Bank of Nova
Scotia Trust Company of New York, as trustee (the "Trustee").

       WHEREAS,  the Company,  the  Guarantors,  and the Trustee entered into an
Indenture dated as of May 29, 1998 (the "Indenture") to provide for the issuance
of the Company's 9 1/4 % Senior Subordinated Notes due 2008;

       WHEREAS,  the Company,  the Parent Guarantor,  the Trustee and SK Europe,
Inc.  entered into the First  Supplement  Indenture dated December  18,1998 (the
"First Supplemental Indenture");

       WHEREAS,  Safety-Kleen  (Delaware),  Inc., a  wholly-owned  subsidiary of
Safety-Kleen  (Lone  and  Grassy  Mountain),   Inc.,  which  is  a  wholly-owned
subsidiary of the Company,  acquired an  additional  20% ownership of each of SK
Services  and SK Services  East so that it now holds 100% of each of SK Services
and SK Services East;

       WHEREAS, pursuant to Sections 1307 and 1308 of the Indenture, SK Services
and SK Services East, as Subsidiary Guarantors,  are each required to enter into
this Second Supplemental Indenture (the "Second Supplemental Indenture");

       WHEREAS, the Company, the Parent Guarantor, SK Services, SK Services East
and the Trustee are authorized to enter into this Second Supplemental Indenture;

       NOW,  THEREFORE,  for and in consideration of the premises and the mutual
covenants contained in this Second Supplemental Indenture and for other good and
valuable  consideration,  the  receipt  and  sufficiency  of  which  are  herein
acknowledged,  the Company, the Parent Guarantor,  SK Services, SK Services East
and the  Trustee  hereby  agree  for the equal and the  ratable  benefit  of all
Holders of the Securities as follows:


                                   ARTICLE ONE

                                   Definitions
                                   -----------

       1.1 Definitions.  For purposes of this Second Supplemental Indenture, the
terms defined in the recitals  shall have the meanings  therein  specified;  any
terms  defined  in the  Indenture  and not  defined  herein  shall have the same
meanings  herein as therein  defined;  and  references  to  Articles or Sections
shall,  unless the context  indicates  otherwise,  be  references to Articles or
Sections of the Indenture.


<PAGE>

                                   ARTICLE TWO

                  GUARANTEES OF SECURITIES AND OTHER PROVISIONS
                  ---------------------------------------------

       2.1 SK Services Guarantee.
           ---------------------

       (a)  SK  Services  hereby  jointly  and  severally,   fully,  absolutely,
unconditionally  and  irrevocably  guarantees  to  each  Holder  of  a  Security
authenticated  and delivered by the Trustee,  and to the Trustee for its benefit
and the benefit of each Holder, the punctual payment and performance when due of
all Indenture Obligations which, for purposes of its Securities Guarantee, shall
also be  deemed to  include  all  commissions,  fees,  charges,  costs and other
expenses (including  reasonable legal fees and disbursements of counsel) arising
out of or  incurred  by the  Trustee  or the  Holders  in  connection  with  the
enforcement of any Securities Guarantee.  Without limiting the generality of the
foregoing,  SK Services'  liability  shall extend to all amounts that constitute
part of the  Indenture  Obligations  and  would be owed by the  Company  to such
Holder or the Trustee  under the  Securities  or the  Indenture but for the fact
that they are unenforceable, reduced, limited, suspended or not allowable due to
the existence of a bankruptcy,  reorganization or similar  proceeding  involving
the Company.

       (b) SK Services and by its  acceptance  of a Security  each Holder hereby
confirms  that it is the  intention of all such parties that the guarantee by SK
Services  pursuant to its  Securities  Guarantee  not  constitute  a  fraudulent
transfer or conveyance for purposes of the Federal  Bankruptcy Code, the Uniform
Fraudulent  Conveyance Act, the Uniform  Fraudulent  Transfer Act of any similar
federal or state law or the  provisions  of its local law relating to fraudulent
transfer or conveyance.  To effectuate the foregoing intention,  the Holders and
SK Services  hereby  irrevocably  agree that the  obligations  of such Guarantor
under its Securities  Guarantee  shall be limited to the maximum amount as shall
after giving effect to all other contingent and fixed liabilities of SK Services
and after giving effect to any collections from or payments made by or on behalf
of any other  Guarantor in respect of the  obligations  of such other  Guarantor
under its  Securities  Guarantee or pursuant to paragraph (c) of Section 1301 of
the  Indenture,  result in the  obligations  of SK Services under its Securities
Guarantee not constituting a fraudulent  conveyance or fraudulent transfer under
federal or state law.

       (c) SK  Services,  the  Trustee and each  Holder by its  acceptance  of a
Security  hereby agrees that the  Securities  Guarantee of SK Services  provided
hereunder  shall be subject  to all  terms,  provisions  and  conditions  in the
Indenture that relate to a Securities Guarantee (including,  without limitation,
Articles XIII and XIV of the Indenture).  SK Services further agrees to be bound
by, and to comply with, all provisions of the Indenture and Securities Guarantee
that are applicable to a Subsidiary Guarantor.

<PAGE>

       3.2 SK Services East Guarantee.
           ---------------------------
       (a) SK Services East hereby  jointly and  severally,  fully,  absolutely,
unconditionally  and  irrevocably  guarantees  to  each  Holder  of  a  Security

authenticated  and delivered by the Trustee,  and to the Trustee for its benefit
and the benefit of each Holder, the punctual payment and performance when due of
all Indenture Obligations which, for purposes of its Securities Guarantee, shall
also be  deemed to  include  all  commissions,  fees,  charges,  costs and other
expenses (including  reasonable legal fees and disbursements of counsel) arising
out of or  incurred  by the  Trustee  or the  Holders  in  connection  with  the
enforcement of any Securities Guarantee.  Without limiting the generality of the
foregoing,  SK  Services  East's  liability  shall  extend to all  amounts  that
constitute part of the Indenture Obligations and would be owed by the Company to
such Holder or the Trustee  under the  Securities  or the  Indenture but for the
fact that they are unenforceable,  reduced, limited,  suspended or not allowable
due to the  existence  of a  bankruptcy,  reorganization  or similar  proceeding
involving the Company.

       (b) SK  Services  East and by its  acceptance  of a Security  each Holder
hereby  confirms that it is the intention of all such parties that the guarantee
by SK Services  East  pursuant to its  Securities  Guarantee  not  constitute  a
fraudulent  transfer or conveyance for purposes of the Federal  Bankruptcy Code,
the Uniform Fraudulent  Conveyance Act, the Uniform  Fraudulent  Transfer Act of
any similar  federal or state law or the provisions of its local law relating to
fraudulent transfer or conveyance.  To effectuate the foregoing  intention,  the
Holders and SK Services East hereby  irrevocably  agree that the  obligations of
such Guarantor  under its Securities  Guarantee  shall be limited to the maximum
amount  as  shall  after  giving  effect  to  all  other  contingent  and  fixed
liabilities of SK Services East and after giving effect to any collections  from
or  payments  made by or on behalf  of any other  Guarantor  in  respect  of the
obligations of such other Guarantor  under its Securities  Guarantee or pursuant
to paragraph (c) of Section 1301 of the Indenture,  result in the obligations of
SK Services East under its  Securities  Guarantee not  constituting a fraudulent
conveyance or fraudulent transfer under federal or state law.

       (c) SK Services  East, the Trustee and each Holder by its acceptance of a
Security  hereby  agrees  that the  Securities  Guarantee  of SK  Services  East
provided  hereunder shall be subject to all terms,  provisions and conditions in
the  Indenture  that  relate  to  a  Securities  Guarantee  (including,  without
limitation,  Articles XIII and XIV of the  Indenture).  SK Services East further
agrees to be bound by, and to comply with,  all  provisions of the Indenture and
Securities Guarantee that are applicable to a Subsidiary Guarantor.

       3.3 Execution and Delivery of Guarantee.
           ------------------------------------

       The  delivery of any Security by the  Trustee,  after the  authentication
thereof under the  Indenture,  shall  constitute  due delivery of the Securities
Guarantee on behalf of SK Services and SK Services East.

<PAGE>

       3.4 Amendment of Schedule A.
           ------------------------

       In order to  reflect  the  Securities  Guarantee  of SK  Services  and SK
Services  East,  Schedule  A of  the  Indenture  and  Schedule  A of  the  First
Supplemental  Indenture is hereby replaced by Schedule A attached to this Second
Supplemental Indenture.

       3.5 No Personal Liability.
           ----------------------

       No  stockholder,  officer,  director,  employee  or  incorporator,  past,
present or future,  of SK Services or SK Services East, as such,  shall have any
personal  liability under the Securities  Guarantee by reason of his, her or its
status as such stockholder, officer, director, employee or incorporator.

                                  ARTICLE THREE

                                  Miscellaneous
                                  -------------

       4.1 Effect of the Second Supplemental Indenture. This Second Supplemental
           --------------------------------------------
Indenture  supplements  the First  Supplemental  Indenture and the Indenture and
shall be a part and  subject to all the terms  thereof.  Except as  supplemented
hereby,  the  Indenture,  the First  Supplemental  Indenture and the  Securities
issued thereunder shall continue in full force and effect.

       4.2 Counterparts.  This Second Supplemental  Indenture may be executed in
           ------------
counterparts,  each of which shall be deemed an original, but all of which shall
together constitute one and the same instrument.

       4.3 GOVERNING LAW. THIS SECOND  SUPPLEMENTAL  INDENTURE SHALL BE GOVERNED
           -------------
BY, AND CONSTRUED IN ACCORDANCE WITH, THE LAWS OF THE STATE OF NEW YORK.

       4.4 Recitals. The Trustee shall not be responsible for any recital herein
           --------
(other than the sixth  recital as it applies to the  Trustee)  as such  recitals
shall be taken as statements of the Company, or the validity of the execution by
SK Services  or SK Services  East of this  Second  Supplemental  Indenture.  The
Trustee  makes no  representations  as to the  validity or  sufficiency  of this
Second Supplemental Indenture.

       IN  WITNESS   WHEREOF,   the  parties  hereto  have  caused  this  Second
Supplemental Indenture to be duly executed on this 9th day of August 1999.

                                SAFETY-KLEEN SERVICES, INC.

                                By: /s/ Kenneth W. Winger
                                   -------------------------
                                Name:   Kenneth W. Winger
                                Title:  President


<PAGE>



                                SAFETY-KLEEN CORP.

                                By: /s/ Kenneth W. Winger
                                   -------------------------
                                Name:   Kenneth W. Winger
                                Title:  President and Chief Executive Officer


                                SK SERVICES, L.C.

                                By:   /s/ Kenneth W. Winger
                                   -------------------------
                                Name:   Kenneth W. Winger
                                Title:  President and Sole Member
                                        Safety-Kleen (Delaware), Inc.


                                SK SERVICES (EAST), L.C.

                                By: /s/ Kenneth W. Winger
                                   -------------------------
                                Name:   Kenneth W. Winger
                                Title:  President and Sole Member
                                        Safety-Kleen (Delaware), Inc.

                                THE BANK OF NOVA SCOTIA TRUST
                                COMPANY OF NEW YORK, as Trustee

                                By:   /s/ George E. Timmes
                                   -------------------------
                                Name:   George E. Timmes
                                Title:  Vice President


<PAGE>

                                   SCHEDULE A

                              SUBSIDIARY GUARANTORS

Safety-Kleen Systems, Inc.
Safety-Kleen (Altair), Inc.
Safety-Kleen (Aragonite), Inc.
Safety-Kleen (Bartow), Inc.
Safety-Kleen (Baton Rouge), Inc.
Safety-Kleen (BDT), Inc.
Safety-Kleen (Bridgeport), Inc.
Safety-Kleen (Buttonwillow), Inc.
Safety-Kleen (California), Inc.
Safety-Kleen (Chattanooga), Inc.
Safety-Kleen (Clive), Inc.
Safety-Kleen (Colfax), Inc.
Safety-Kleen (Crowley), Inc.
Safety-Kleen (Custom Transport), Inc.
Safety-Kleen (Deer Park), Inc.
Safety-Kleen (Deer Trail), Inc.
Safety-Kleen (Delaware), Inc.
Safety-Kleen (Encotec), Inc.
Safety-Kleen (FS), Inc.
Safety-Kleen (Gloucester), Inc.
Safety-Kleen (GS), Inc.
Safety-Kleen Holdings, Inc.
Safety-Kleen (La Porte), Inc.
Safety-Kleen (Lone and Grassy Mountain) Inc.
Safety-Kleen (Los Angeles), Inc.
Safety-Kleen (Minneapolis), Inc.
Safety-Kleen (Mt. Pleasant), Inc.
Safety-Kleen (Nashville), Inc.
Safety-Kleen (NE), Inc.
Safety-Kleen (Pecatonica), Inc.
Safety-Kleen (Pinewood), Inc.
Safety-Kleen (Plaquemine), Inc.
Safety-Kleen (PPM), Inc.
Safety-Kleen (Puerto Rico), Inc.
Safety-Kleen (Roebuck), Inc.
Safety-Kleen (Rosemount), Inc.
Safety-Kleen (San Antonio), Inc.
Safety-Kleen (Sawyer), Inc.
Safety-Kleen (TG), Inc.

<PAGE>

Safety-Kleen (Tipton), Inc.
Safety-Kleen (TS), Inc.
Safety-Kleen (Tulsa), Inc.
Safety-Kleen (San Jose), Inc.
Safety-Kleen (Sussex), Inc.
Safety-Kleen (White Castle), Inc.
Safety-Kleen (Wichita), Inc.
Safety-Kleen (Westmorland), Inc.
Safety-Kleen (WT), Inc.
Safety-Kleen OSCO Holdings, Inc.
Safety-Kleen Chemical Services, Inc.
SK Europe, Inc.
SK Services, L.C.
SK Services (East), L.C.
Ninth Street Properties, Inc.
Chemclear, Inc.  of Los Angeles
USPCI, Inc.  of Georgia
GSX Chemical Services of Ohio, Inc.
LEMC, Inc.
Dirt Magnet, Inc.
The Midway Gas & Oil Company
Elgint Corp.
Safety-Kleen Envirosystems Company
Safety-Kleen Envirosystems Company of Puerto Rico, Inc.
Petrocon, Inc.
Phillips Acquisition Corp.
ViroGroup, Inc.
SK Insurance Company
SK Real Estate, Inc.
Safety-Kleen International, Inc.
Safety-Kleen Oil Recovery Co.
Safety-Kleen Oil Services, Inc.
The Solvents Recovery Service of New Jersey, Inc.



                                   EXHIBIT 12
                               Safety-Kleen Corp.
                       Ratio of Earnings to Fixed Charges
                                ($ in thousands)

<TABLE>
<CAPTION>

                                                                    Year Ended August 31
                                                                    --------------------
                                           1999          1998          1997         1996          1995
                                           ----          ----          ----         ----          ----
<S>                                     <C>           <C>           <C>           <C>         <C>

Income (loss) from continuing
  operations before income tax          $ 181,266     $  20,352     $(306,122)    $ 11,860    $ 21,684
Add:
   Portion of rents representative
     of the interest factor                18,568        16,841        12,033       11,967      11,800
   Interest on indebtedness,
     including amortization of
     deferred financing charges           172,028       107,697        44,273       46,850      41,142
                                        ---------     ---------     ---------     --------    --------
Income as adjusted                      $ 371,862     $ 144,890     $(249,816)    $ 70,677    $ 74,626
                                        =========     =========     ==========    ========    ========

Fixed charges
   Portion of rents representative
     of the interest factor             $  18,568     $  16,841     $  12,033     $ 11,967    $ 11,800
   Interest on indebtedness,
     including amortization of
     deferred financing charges           172,028       107,697        44,273       46,850      41,142
                                        ---------     ---------     ---------     --------    --------
Total fixed charges                     $ 190,596     $ 124,538     $  56,306     $ 58,817    $ 52,942
                                        =========     =========     =========     ========    ========

Ratio of earnings to fixed charges          1.95           1.16         (4.44)        1.20        1.41
                                        ========      =========     ==========    ========    ========
</TABLE>



Safety-Kleen Corp. 1999 Annual Report     99 Going the Distance




                                  FRONT COVER

                                - p i c t u r e -








<PAGE>






                               INSIDE FRONT COVER

                                - p i c t u r e -








Headquartered  in Columbia,  South Carolina,  Safety-Kleen  Corp. is the premier
industrial services company in North America servicing over 400,000 customers of
all sizes in a broad range of markets.  The majority of these customers generate
some type of regulated waste that must be handled  responsibly and  efficiently.
Safety-Kleen  is the only service  provider that offers a completely  integrated
network designed to collect, process, recycle and dispose of an almost unlimited
range of both hazardous and non-hazardous waste streams.


<PAGE>




Financial Highlights & Selected Financial Data

 Total Revenue             Total Assets        Operating Cash Flow (1)
($ in millions)           ($ in millions)          ($ in millions)

95      $599              95      $1,367            95      $108
96      $653              96      $1,491            96      $106
97      $679              97      $1,611            97      $121
98      $1,185            98      $4,469            98      $279
99      $1,686            99      $4,477            99      $481

<TABLE>
<CAPTION>

Year Ended August 31                             1999             1998             1997              1996             1995
($ in thousands, except per share amounts)
- --------------------------------------------------------------------------------------------------------------------------
<S>                                         <C>              <C>              <C>              <C>              <C>

Revenue                                     $ 1,685,948      $ 1,185,473      $  678,619       $   652,973      $   599,241
- --------------------------------------------------------------------------------------------------------------------------
Operating income (loss) (2)                 $   344,783      $   120,392      $ (264,714)      $    57,319      $    59,859
- --------------------------------------------------------------------------------------------------------------------------
Income (loss) from
continuing operations (2)                   $   103,912      $    11,488      $ (183,452)      $     6,714      $    16,765
- ---------------------------------------------------------------------------------------------------------------------------
Income (loss) per share from
continuing operations  -Basic (3)           $      1.17      $      0.18      $    (5.32)      $      0.22      $      0.56
                       -Diluted (3)         $      1.03      $      0.18      $    (5.32)      $      0.22      $      0.56
- ---------------------------------------------------------------------------------------------------------------------------
Dividends per common share                  $        --      $       --       $       --       $        --      $        --
- ---------------------------------------------------------------------------------------------------------------------------
Total assets                                $ 4,366,804      $ 4,468,895      $ 1,610,878      $ 1,491,294      $ 1,367,411
- ---------------------------------------------------------------------------------------------------------------------------
Long-term debt                              $ 1,967,434      $ 1,930,168      $   540,096      $    55,838      $    64,256
Weighted average common
stock outstanding (000's) (3)                    88,537           62,322           34,508           30,000           30,000
- ---------------------------------------------------------------------------------------------------------------------------
Weighted average common
stock outstanding and assumed
conversions (000's) (3)                         111,645           62,322            34,508           30,000          30,000
- ---------------------------------------------------------------------------------------------------------------------------
</TABLE>


(1) Operating  income before restructuring and other  charges, plus depreciation
     and amortization.

(2) Includes restructuring and other charges of $65.8 million in 1998 and $331.7
    million in 1997.

(3) Restated to reflect a one-for-four reverse stock split effective December 1,
    1998.

Private Securities Litigation Reform Act: Portions of this Annual Report contain
various forward-looking  statements which reflect management's current views and
estimates of future  economic  circumstances,  industry  conditions  and Company
performance.   These   statements   include   financial,   operating  and  other
projections.  Factors  that could  cause  actual  results  to differ  from these
projections  include risks  associated  with  acquisitions;  the adoption of new
environmental  laws and  regulations and changes in how they are interpreted and
enforced; changes in demand for the Company's services;  competition; and prices
for petroleum-based products.

Table of Contents   Selected Financial Data  1     Shareholder Information    8

                    President's Letter       2     Annual Report on Form 10K

                    Service Matrix           3     Facility Locations        IBC

                    Going the Distance      4-7

                                        1
<PAGE>


Letter to Shareholders

Going the  distance.  This is what  Safety-Kleen  is all  about.  Our  Company's
culture  is built upon the  promise to always  provide  superior  service.  This
commitment is visible in our alliance with our  customers,  our  employees,  the
environment  and our  stakeholders.  It is what  pushes us each day to make that
extra effort and go the extra mile.

In our last annual report to  shareholders,  we stated that our foremost goal in
fiscal 1999 was to complete the integration of the former Laidlaw  Environmental
Services and Safety-Kleen Corp. into the leading industrial  services company in
North America. That goal has been achieved.
         During the fiscal  year,  we sold a majority  interest in our  European
operations;  reduced  our long  term debt from  $2.28  billion  in 1998 to $1.97
billion at year end; achieved our merger synergy targets;  maintained  operating
margins  in excess of 20.5%;  re-aligned  our  business  operations  into a more
effective  centralized  operating  structure;  and  substantially  completed the
process of making two corporate headquarters one.

But we did not stop there.
In addition to these tasks, we set out to reintroduce the new  Safety-Kleen  and
the expanded menu of services we offer to commercial and industrial  markets. By
increasing  the number of services to our  existing  customers  and defining new
areas of  growth  in waste  water  services,  coolant  management  services  and
industrial lubricants management,  we are now uniquely positioned as the leading
service provider to the industrial marketplace.  Industrial Services contributed
$800.1 million, or 47%, to our record fiscal 1999 revenue of $1.69 billion. This
business  component is  Safety-Kleen's  future growth vehicle for the rollout of
new  services and is targeted to  contribute  an  increasing  growth rate during
fiscal 2000. The Company's  successful  introduction  of Compliance,  Vacuum and
Imaging  Services  in the  Commercial  and  Institutional  Services  markets are
examples of how we have successfully  utilized and leveraged the existing branch
and route-based infrastructure to introduce new services.

What is next?
The challenges of 1999 have helped us to focus more clearly on the opportunities
ahead. The integration of Safety-Kleen's assets, sales and service personnel and
management teams was an exacting process that allowed us to evaluate how to best
move forward in a  consolidating  industry and produce  long-term  value for our
shareholders.  I believe that today's  Safety-Kleen  is uniquely  positioned  to
benefit from the changes  taking place in the waste  industry.  We know that our
unparalleled collection,  recycle,  treatment and disposal capabilities allow us
to quickly and efficiently service all sizes and types of customers across North
America.  Furthermore,  we have identified a tremendous market  opportunity with
both existing and new customers. We now have the people, the facilities, and the
resources in place to continue to build our leading market  position in the year
2000 and beyond.
         Safety-Kleen's   business  is  a  service  business  largely  based  on
personal,  face-to-face  contact with its customers.  Our success is a result of
all of the  Safety-Kleen  employees who make the commitment to provide  superior
service, day-in and day-out. In particular,  I would like to recognize and thank
each of them for their invaluable contributions during a period of rapid change.
         To our shareholders,  our customers,  and our suppliers,  we appreciate
and thank you for your continuing support of Safety-Kleen Corp.

/s/Kenneth W. Winger

Kenneth W. Winger
President and Chief Executive Officer


                                        2
<PAGE>


<TABLE>
<CAPTION>



                              Collection & Recovery Component                             Treatment &
                                                                                          Disposal Component
<S>                           <C>                             <C>                       <C>

                              Industrial Services             Commercial/Institutional
                                                               Services

Fiscal 1999 Revenue           $ 800 million                   $ 541 million               $ 313 million
                                47% of total revenue            32% of total revenue        19% of total revenue

Services Offered              o Industrial Waste              o Automotive Parts          o Thermal Treatment
                                Service                         Cleaner Service             - Eight commercial
                                - Small/large quantities        - Solvent/aqueous based.    incineration facilities.
                                of solid and liquid drum        - Customer-owned            - Only incineration
                                wastes.                         machines.                   facility permitted for
                                - Technical Field Service     o Compliance                  dioxin destruction in
                                - Remedial Service            o Dry Cleaner Service         North America.
                              o Industrial Parts              o Imaging Service             - Eight hazardous/three
                                Cleaner Service               o Paint Refinishing           non-hazardous landfills.
                                - Solvent/aqueous based.        Service                   o Specialty Services
                                - Customer-owned machines.    o Used Oil Collection         - PCB management
                              o Industrial Lubricant          o Used Oil Re-refining        - Wastewater processing
                                Management                    o Vacuum Truck Service        - Harbor dredging,
                              o Coolant Management                                          treatment and placement
                              o Water Management

Market Potential              o Market is $4.3                o Market is $1.1            o Market is $2.0
                                billion and nearly 400,000      billion excluding used      billion  for hazardous
                                potential customers             oil services.               waste treatment and
                                - Safety-Kleen currently        - Safety-Kleen currently    disposal
                                has 20% revenue share and       has 33% revenue share       - Safety-Kleen currently
                                120,000 customers.              and 250,000 customers.      has 16% revenue share.
                                - Every manufacturing         o Waste Oil                 o Safety-Kleen
                                establishment in the U.S.       collection market is        maintains 8 of 20
                                has a potential need for        estimated at 800 million    off-site commercial
                                the services offered by 7       gallons.                    incinerators in North
                                of the 12 Industrial            - Safety-Kleen now          America.
                                lines of business               collects 240 million      o Commercial
                                Safety-Kleen offers.            gallons of used oil         incineration market
                                                                annually.                   estimated at $485
                                                                - Re-refines                million.
                                                                approximately 80 million    - Safety-Kleen has 43%
                                                                gallons of base lube per    market share.
                                                                year.                     o Safety-Kleen
                                                                                            operates 8 of the 23
                                                                                            hazardous waste
                                                                                            landfills in North
                                                                                            America.

Strategy                      o   Further expand and          o Continue to push          o Continue to direct
                                  promote single source         into aqueous parts          internal waste streams
                                  service capabilities to       cleaning market as          to Safety-Kleen
                                  the underserved, medium       alternative to              treatment and disposal
                                  quantity waste generator,     solvent-based units, and    facilities and maintain
                                  by bundling traditional       focus on expansion of       incineration utilization
                                  services with new             existing Imaging, Vacuum    levels in excess of 90%.
                                  offerings.                    as well as new
                                                                route-based services.

</TABLE>



                                        3
<PAGE>




                         Going the Distance

                         "As a BIM for nearly  five years,  my  responsibilities
                         and  opportunities  to pursue new  business  have grown
                         dramatically   with   the   flood   of   new   services
                         Safety-Kleen now offers. Whether it's an opportunity in
                         parts cleaners, compliance, absorbents, transformers or
                         waste water  streams,  my commitment to the customer is
                         -- We can do that."

                         Not  only  does  a  BIM  focus  on  managing   existing
                         industrial accounts, more and more they are identifying
                         and   tailoring   a  specific   service  to  satisfy  a
                         customer's   future   needs.   The   industrial   needs
                         assessment  checklist  has  grown  from  less  than  40
                         categories  to nearly  60  service  opportunities  that
                         Safety-Kleen  now readily  tackles.  The  expansion  of
                         waste codes and internal disposal  facilities opens the
                         door for  Safety-Kleen  to pursue  virtually  all waste
                         management and site remediation opportunities.
                           Whether  calling  on  small,  medium,  or  large-size
                         industrial  customers,  the  Safety-Kleen  BIM uses the
                         eyes and  ears of the  Industrial  Service  Rep to help
                         evaluate  additional  Safety-Kleen  services a customer
                         may  require.  A growing  component  of the  industrial
                         sales focus is the  promotion of several  programs that
                         move Safety-Kleen closer to the customer's  operations.
                         The INSITE  Environmental  Management  program stations
                         one or  more  Safety-Kleen  employees  at a  customer's
                         workplace  to  directly   manage  all  aspects  of  the
                         client's   waste   management   program.    The   Total
                         Environmental  Activity  Management  program analyzes a
                         customer's current service  requirements and recommends
                         necessary  adjustments in their operations,  compliance
                         practices,  and waste  minimization  opportunities.  In
                         addition,   Safety-Kleen's   newest  on-site  recycling
                         services for aqueous and  industrial  fluid streams are
                         now bundled with the  traditional  waste services which
                         saves the customer money,  while  increasing the number
                         of Safety-Kleen services utilized.
                           These   new   services   and   marketing   strategies
                         demonstrate Safety-Kleen's commitment to address all of
                         their  customers  environmental  compliance  and  waste
                         handling needs.
- - picture -

Todd Pikor
Branch Industrial Manager
("BIM")

Approximately  4,000  branch-based  sales
and service personnel assist Safety-Kleen
customers on a daily basis from more than
175  branch  locations  throughout  North
America.

                     - picture -

                     Combined, more  than 3.0 million drums of
                     industrial wastes are collected, treated,
                     recycled or  disposed of  by Safety-Kleen
                     personnel on an annual basis.


                                             - picture -

                                             Safety-Kleen annually collects more
                                             than 200 million  gallons  of  used
                                             solvent from  its customers and re-
                                             cycles more than 85% back  into re-
                                             usable solvent.

                                        4
<PAGE>

As Safety-Kleen  looks at new opportunities in the consolidating  waste industry
as well as the internal  development  of  additional  services,  the  underlying
requirement is that they will be supported by the existing infrastructure of the
branch-based service.
         For example,  the Vacuum  Service was  introduced in 1996  primarily to
enhance service to automotive customers using a Safety-Kleen parts cleaner. This
successful  service  introduction  has expanded  rapidly into a growing business
that focuses  primarily on an unserved  market.
         A recent rollout of the Vacuum Service to an expanded customer base now
allows the service  representative to collect a broader variety of waste streams
such as coolants, hydraulic fluids, or waste waters in addition to waste oil and
sludges.  Servicing both commercial and industrial customers,  a Vac rep may see
customers as often as twice a month or on a semi-annual basis. Approximately 70%
of these  customers  are already  using  other  Safety-Kleen  services.
         Similar   services   that   leverage   off  of  the   existing   branch
infrastructure have been introduced in recent years such as the Imaging Services
program that offers  compliance  services  and silver and aluminum  recovery for
photo finishing,  medical x-rays,  publishing and graphic arts businesses.  More
recently,  the introduction of ArmaKleen,  the result of a joint venture between
Safety-Kleen and Church and Dwight,  makers of Arm & Hammer  products,  offers a
new chemistry  for aqueous parts  cleaners and  industrial  cleaning  chemicals.
Another area of expanded  service is  integrated  compliance.  Safety-Kleen  now
markets compliance  solutions,  regulatory training,  material safety data sheet
management, hotlines and other programs to customers through its extensive sales
and service network.

"Many of my customers in the automotive industry need our service on a scheduled
or sometimes even unscheduled  basis. When a garage's  underground  separator is
full  or  clogged,  there  is  very  little  that  can be  accomplished  until a
Safety-Kleen  Vac  truck  arrives.  I am  always  prepared  to be  paged  for an
emergency service."
                                                  - picture -

                                                  Jim Gellner
                                                  Vacuum Services Representative
As   a   result   of   its   recent
acquisition   of  First   Recovery,
Safety-Kleen  will collect  roughly
240  million  gallons  of used  oil
annually.    Nearly   130   million
gallons will be re-refined of which
80  million  will  then  be sold as
base lube stock.

- - picture -

                  Safety-Kleen operates 11 Hazardous and Non-
                  hazardou   Landfills  With Over 67  Million
                  Cubic Yards of Capacity,  Allowing  for  an
                  Average Life of Approximately 60 Years.


                                              Safety-Kleen services over 400,000
                                              solvent  and  aqueous based  parts
                                              cleaners  in  its  industrial  and
                                              commercial/institutional  markets.

                                        5
<PAGE>

                  Going the Distance

                  "I personally believe that if you only do `just the basics' in
                  your job,  then  that's  all you will ever be known  for. I am
                  very  proud of the fact  that in my role as  Project  Manager,
                  Safety-Kleen's   services  are   completely   and   seamlessly
                  integrated with Monsanto's  progressive work  environment.  We
                  always try to do more here and the result speaks for itself --
                  We're busier than ever."

                  The   unique   role  of  an  on-site   environmental   manager
                  encompasses  a number  of  responsibilities.  In  addition  to
                  managing the  collection,  packing and direct  shipment of all
                  waste  streams  from the  facility,  Linda also  assists  with
                  on-site training  courses,  environmental  seminars,  facility
                  inspections  and  consulting  on the  development  of a custom
                  waste billing system.
                           This   is  an   example   of  a   growing   part   of
                  Safety-Kleen's   industrial   business  -the   development  of
                  services that help customers  manage all phases of their waste
                  program.   For  many  years,   Safety-Kleen   focused  on  the
                  smaller-quantity waste generator.  While this type of customer
                  remains a large  percentage of  Safety-Kleen's  business,  the
                  Company has identified an increasing  number of customers with
                  more  sophisticated  waste handling needs.  Today Safety-Kleen
                  has the largest industrial sales/service force in the industry
                  coupled  with  the  complete  range  of  permits,  skills  and
                  facilities  required  to  fully  service  the  needs  of these
                  larger-scale  customers.
                           Whether  it  is a  field  chemist  who  travels  on a
                  regional  basis or remains  on-site at a customer's  facility,
                  Safety-Kleen frequently puts an environmental  professional at
                  a  customer's   location  to  oversee  the  responsibility  of
                  documenting  and removing wastes on a scheduled  basis.  These
                  waste streams are then shipped directly to a disposal facility
                  or transferred to a Safety-Kleen Accumulation Center where the
                  material  is  consolidated  and  the  appropriate  processing,
                  treatment or disposal option is determined.

- - picture -

Linda Vishino
INSITE Project Manager
Monsanto

         - picture -

         The   average   automotive   service  rep
         completes 10-15 services  daily.  This is
         just  the  beginning  of  the  4  million
         service  calls  Safety-Kleen  makes on an
         annual basis.

                                        - picture -

                                       Safety-Kleen's  combined  fleet consists
                                       of over 4,000 vehicles driven an average
                                       of 100 miles per day on a typical service
                                       route.





                                        6
<PAGE>


In addition to the 31  fully-permitted  Accumulation/Service
Centers Safety-Kleen operates,  there are 10 Recycle Centers
throughout the United States.
          The  Recycle  Centers  (RCs)  in  the  Safety-Kleen
network  primarily  reclaim waste  streams  collected by the
Company's vast branch service  network.  While waste solvent
is the predominate  recyclable material,  some RCs work with
cleaning fluid, industrial degreasers, PCB-contaminated oil,
and  inorganic  wastewater.  Waste  streams  that  cannot be
cleaned and returned to their  original  state for reuse are
prepared for different applications such as fuel blending to
use  as an  alternative  fuel  in  cement  kilns.  Remaining
sludges that offer no further  value are disposed of through
the incineration process.

Like the other RCs,  Safety-Kleen's  Chicago  Recycle Center
reclaims used solvents and waste streams from many different
types of businesses. However, this particular Recycle Center
is  unique  in that it is  primarily  a custom  recycle  and
tolling  facility  where  material is usually  delivered  by
tanker or  railcar  instead  of in drums.  Receiving  large,
direct ship quantities from  multi-national  pharmaceutical,
electronics,  polymer, chemical, and agricultural companies,
the Chicago RC works closely with its customers and partners
to  assure  that  their  waste is  handled  efficiently  and
responsibly.  After recycling the fluids, the clean material
is returned to the  customer or sold to other  customers  on
the open market.

"As  facility  manager,   I  am  directly  involved  in  the
technical,  environmental, and safety aspects of our recycle
facility to ensure that we have provided  `peace of mind' to
our customers.  We always go the distance for our customers,
not as a special  consideration,  but because it is our duty
in the concept of customer service."

                                                                Alfred  Aghapour
                                                                Facility Manager
                                                          Chicago Recycle Center

                                                                   - picture -

Nearly   130,000    businesses    participate   in
Safety-Kleen's  WE  CARE  program,   demonstrating
their  commitment to protect the  environment  and
employ   the   most   environmentally    desirable
waste-handling methods.

- -  picture  -

                           To address customer needs in its industrial  services
                           and    commercial    and    institutional    markets,
                           Safety-Kleen  presently  offers more than 80 types of
                           service  that  encompass a multitude  of  specialized
                           sub-services.

                                       7
<PAGE>


Company  Directors  James R.  Bullock,  President and Chief  Executive  Officer,
Laidlaw Inc.,  Leslie W.  Haworth,  Senior Vice  President  and Chief  Financial
Officer,  Laidlaw Inc., Robert W. Luba,(1) President,  Luba Financial Inc., John
W. Rollins,  Sr.,  Chairman and Chief Executive  Officer,  Rollins Truck Leasing
Corp., John W. Rollins, Jr.,(2) President, Rollins Truck Leasing Corp., David E.
Thomas,  Jr.,(2) Senior  Managing  Director,  Raymond James & Associates,  Inc.,
Henry B.  Tippie,(1)  Chairman,  President and Chief Executive  Officer,  Tippie
Services, Inc., James L. Wareham,(1) President, AK Steel Corporation, Kenneth W.
Winger,  President and Chief Executive Officer,  Safety-Kleen  Corp.,  Grover C.
Wrenn, President and Chief Executive Officer, Accent Health, Inc.

(1)  Member of the  Audit  Committee  (2)  Member  of the  Human  Resources  and
Compensation Committee
- --------------------------------------------------------------------------------
Executive Officers James R. Bullock,  Chairman of the Board;  Kenneth W. Winger,
President and Chief Executive  Officer;  Michael J.  Bragagnolo,  Executive Vice
President,  Chief Operating  Officer;  Paul R. Humphreys,  Senior Vice President
Finance and Chief Financial Officer;  Henry H. Taylor,  Vice President,  General
Counsel and Secretary.

Senior Management Roy D. Bullinger,  Senior Vice President Business  Management;
David M. Sprinkle,  Senior Vice President Sales and Service; Michael A. Faucett,
Senior Vice President  Disposal and  Incineration;  Barry K. Fogle,  Senior Vice
President  Material  Processing.  James  J.  Hattler,  Vice  President  Business
Development; Robert Arquilla, Vice President Administration;  Donald L. Schwieg,
Vice  President  Technology;   Rick  L.  McEwen,  Vice  President  Planning  and
Logistics;  Timothy P. Keegan, Vice President Oil/Remedial;  William D. Ridings,
Vice President Controller.
- --------------------------------------------------------------------------------
Shareholder Information
Market  Information:  Safety-Kleen  common stock is traded on the New York Stock
Exchange under the ticker symbol SK. The approximate number of record holders of
Safety-Kleen  stock as of Aug. 31, 1999 was 4,063. The following table shows the
range of common  stock prices for the fiscal  quarters  indicated as reported by
The New York Stock Exchange.

<TABLE>
<CAPTION>

Fiscal Year Ended
August 31, 1999               High         Low
<S>                           <C>          <C>          <C>

                                                        Corporate Office
First Quarter                 $ 14-1/2     $   8-1/2    Safety-Kleen Corp.
Second Quarter                $ 16         $ 12-1/16    1301 Gervais Street, Suite 300
Third Quarter                 $ 17-3/16    $ 11-11/16   Columbia, S.C. 29201
Fourth Quarter                $ 19-1/4     $ 11-3/4     Phone: (803) 933-4200
                                                        Please visit us via our website at
Fiscal year ended             High         Low          www.safety-kleen.com.
August 31, 1998
                                                        Financial Publications  Copies of Safety-Kleen's 1999
First Quarter                 $ 23         $ 17-1/2     annual report and other financial documents are available
Second Quarter                $ 20-1/2     $ 15-1/2     upon request to Investor Relations, Safety-Kleen Corp.,
Third Quarter                 $ 19         $ 14-1/2     (803) 933-4285.
Fourth Quarter                $ 17-1/2     $ 11-3/4     You may also e-mail requests to
                                                        [email protected].

                                                        Annual  Meeting Shareholders are  welcome to
                                                        attend the Company's Annual Meeting to be  held  on
                                                        Tuesday, November 30, 1999, at 9:30 a.m., (EST), at
                                                        the Adam's Mark Hotel, 1200 Hampton Street, in
                                                        Columbia, South Carolina.
Stock prices are adjusted to reflect a 1-for-4
reverse split effective December 1, 1998.               Shareholder Inquiries
                                                        EquiServe Trust Company P.O. Box 2500
                                                        Jersey City, NJ 07303-2500
Safety-Kleen has not paid dividends during the          Phone: (800) 446-2617 or
reported periods and does not intend to pay             e-mail: www.equiserve.com
dividends in the foreseeable future


</TABLE>

                                        8
<PAGE>



Safety-Kleen Corp.                               1999 Annual Report on Form 10-K





                                   - picture -

<PAGE>


                               INSIDE BACK COVER


Collection and Recovery Network



                                  Picture - Map

                                                                o Branch
                                                                o Accumulation/
                                                                  Service Center








Treatment, Recycle and Disposal Network


                                  Picture - Map


                                                           o Recycling Center
                                                           o Oil Re-Refinery
                                                           o Secure Landfill
                                                           o Thermal Treatment
                                                           o Specialty Treatment





<PAGE>



Safety-Kleen Corp.                                1301 Gervais Street, Suite 300
                                                  Columbia, South Carolina 29201




                               OUTSIDE BACK COVER
                                   - picture -




                       CORPORATE ORGANIZATIONAL STRUCTURE

                        SAFETY-KLEEN CORP. -  NYSE: (SK)

The  following  list sets forth the  subsidiaries  of  Safety-Kleen  Corp. as of
August 31, 1999.  Parent  subsidiary  relations are indicated by indentations.
Unless otherwise indicated,  100% of the voting securities of each subsidiary is
owned by the indicated parent of such subsidiary.

<TABLE>
<CAPTION>

NAME OF CORPORATION                                                    STATE OF INCORPORATION
<S>                                                                             <C>

Safety-Kleen Corp.                                                              Delaware
     Safety-Kleen Services, Inc.                                                Delaware
         ViroGroup, Inc. (7.8635%)                                              Delaware
         Safety-Kleen (Lone and Grassy Mountain), Inc.                          Oklahoma
             Safety-Kleen (Tulsa), Inc.                                         Oklahoma
                 Safety-Kleen (San Antonio), Inc.                               Texas
                 Safety-Kleen (Wichita), Inc.                                   Kansas
             USPCI of Mississippi, Inc. (50%)                                   Mississippi
             Safety-Kleen (Delaware), Inc.                                      Delaware
                 SK Services (East), L.C.                                       Utah
                 SK Services, L.C.                                              Utah
         Safety-Kleen (Rosemount), Inc.                                         Minnesota
         Safety-Kleen (Sawyer), Inc.                                            Oklahoma
         Safety-Kleen (PPM), Inc.                                               Georgia
             Ninth Street Properties, Inc.                                      Missouri
         Safety-Kleen (San Jose), Inc.                                          California
         Chemclear, Inc. of Los Angeles                                         Delaware
         USPCI, Inc. of Georgia                                                 Delaware
         Safety-Kleen Holdings, Inc.                                            Delaware
         Safety-Kleen (Westmorland), Inc. (50%)                                 California
         Safety-Kleen (Buttonwillow), Inc. (23%)                                California
         Safety-Kleen (NE), Inc.                                                New Hampshire
         Safety-Kleen (Crowley), Inc.                                           Louisiana
         Safety-Kleen (LaPorte), Inc.                                           Texas
         Safety-Kleen (TG), Inc.                                                Delaware
         Safety-Kleen (Roebuck), Inc.                                           South Carolina
         Safety-Kleen (TS), Inc.                                                Delaware
         Safety-Kleen (Colfax), Inc.                                            Delaware
         GSX Chemical Services of Ohio, Inc.                                    Ohio
         LEMC, Inc.                                                             Delaware
         Safety-Kleen Chemical Services, Inc.                                   Massachusetts
         Safety-Kleen (Altair), Inc.                                            Texas
             Safety-Kleen (FS), Inc. (13%)                                      Delaware
         Safety-Kleen (BDT), Inc.                                               New York
         Safety-Kleen (FS), Inc. (87%)                                          Delaware

                                       1
<PAGE>

         Safety-Kleen (GS), Inc.                                                Tennessee
         Safety-Kleen (Clive), Inc.                                             Oklahoma
         Safety-Kleen (WT), Inc.                                                Ohio
         Safety-Kleen OSCO Holdings, Inc.                                       Delaware
             Safety-Kleen (Nashville), Inc.                                     Tennessee
             OSCO Treatment Systems of Mississippi, Inc. (50%)                  Tennessee
         Safety-Kleen (Bartow), Inc.                                            Florida
         Safety-Kleen (California), Inc.                                        California
             Safety-Kleen (Buttonwillow), Inc. (77%)                            California
             Safety-Kleen (Westmorland), Inc. (50%)                             California
         Safety-Kleen (Chattanooga), Inc.                                       Tennessee
         Safety-Kleen (Pecatonica), Inc.                                        Illinois
         Safety-Kleen (Pinewood), Inc.                                          South Carolina
         Safety-Kleen (White Castle), Inc.                                      Colorado
         Safety-Kleen (Puerto Rico), Inc.                                       Puerto Rico
         Safety-Kleen (Bridgeport), Inc.                                        Delaware
         Safety-Kleen (Deer Park), Inc.                                         Delaware
         Safety-Kleen (Baton Rouge), Inc.                                       Delaware
         Safety-Kleen (Plaquemine), Inc.                                        Delaware
         Safety-Kleen (Custom Transport), Inc.                                  Delaware
         Safety-Kleen (Los Angeles), Inc.                                       California
         Safety-Kleen (Tipton), Inc.                                            Delaware
         Safety-Kleen (Gloucester), Inc.                                        Delaware
         Safety-Kleen (Deer Trail), Inc.                                        Colorado
         Safety-Kleen (Mt. Pleasant), Inc.                                      Tennessee
         Safety-Kleen (Minneapolis), Inc.                                       Minnesota
             Safety-Kleen (Aragonite), Inc.                                     Delaware
         Safety-Kleen (Sussex), Inc.                                            Delaware
         Safety-Kleen (Encotec), Inc.                                           Delaware
         Safety-Kleen Systems, Inc.                                             Wisconsin
             Curbside, Inc. (49%)                                               California
             SK Europe, Inc.                                                    Nevada
                 Safety-Kleen Europe Limited (44%)                              United Kingdom
             Dirt Magnet, Inc.                                                  Colorado
                 The Midway Gas and Oil Co.                                     Colorado
             Safety-Kleen Canada Inc. (1)                                       Ontario
                 Environnement Services et Machinerie E.S.M. Inc.               Quebec
             Elgint Corp.                                                       Nevada
             Safety-Kleen Envirosystems Company                                 California
                 Safety-Kleen Envirosystems Company of Puerto Rico, Inc.        Indiana


(1)    3095-7146  Quebec Inc.  holds 711,199 Class Z shares  (however,  they are
       physically held by  Safety-Kleen  Canada Inc. and  Safety-Kleen  Systems,
       Inc. as collateral for payment of outstanding loans).

                                      2
<PAGE>


             Petrocon, Inc.                                                     Delaware
             Phillips Acquisition Corp.                                         Delaware
             ViroGroup, Inc. (78.6349%)                                         Delaware
             SK Insurance Company                                               Vermont
             SK Real Estate Inc.                                                Illinois
             Safety-Kleen International, Inc.                                   Delaware
             Safety-Kleen Oil Recovery Co.                                      Delaware
             Safety-Kleen Oil Services, Inc.                                    Delaware
             The Solvents Recovery Service of New Jersey, Inc.                  New Jersey
             3E Company Environmental, Ecological and Engineering (75.8%)       California
        Safety-Kleen Services (Canada), Ltd.                                    Canada
             Safety-Kleen Ltd.                                                  Ontario
             Safety-Kleen (BC) Ltd.                                             Canada
             1197296 Ontario Inc.                                               Ontario
             Safety-Kleen Services (Quebec) Ltd.                                Quebec
                 Safety-Kleen Services (Mercier) Ltd.                           Quebec
                 SK D'Incineration Inc.                                         Quebec
             Safety-Kleen (Ryley) Ltd.                                          Alberta
             Safety-Kleen (Atlantic) Limited                                    Nova Scotia
             Safety-Kleen (On-Site) Inc.                                        Ontario

                                       3
</TABLE>





                       CONSENT OF INDEPENDENT ACCOUNTANTS
                       ----------------------------------

We  hereby  consent  to the  incorporation  by  reference  in  the  Registration
Statement on Form S-8 of Safety-Kleen Corp. of our report dated October 5, 1999,
relating  to  the  financial   statements  and  financial   statement  schedule,
respectively, which appears in the Annual Report Form 10-K.


PricewaterhouseCoopers LLP

Charlotte, North Carolina
October 5, 1999





                  Power of Attorney on signature pages (65-66)


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