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




                                  FRONT COVER

                                - p i c t u r e -















                               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.







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




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

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



(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



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








                              Collection & Recovery Component                             Treatment &
                                                                                          Disposal Component
                                                                               

                              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.





                                        3





                         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


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


                  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



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



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.




Fiscal Year Ended
August 31, 1999               High         Low
                                               

                                                        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
                                                        investorrelations@safety-kleen.com.

                                                        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




                                        8




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





                                   - picture -




                               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









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




                               OUTSIDE BACK COVER
                                   - picture -