1 L A I D L A W ENVIRONMENTAL SERVICES 2 LAIDLAW ENVIRONMENTAL PROFILE - LARGEST AND MOST INTEGRATED HAZARDOUS AND INDUSTRIAL WASTE MANAGEMENT COMPANY IN NORTH AMERICA - LEADING INDUSTRY CONSOLIDATOR IN NORTH AMERICA - SEASONED MANAGEMENT TEAM - PROVEN TRACK RECORD OF BUSINESS INTEGRATION SUCCESS- TWO MAJOR ACQUISITIONS IN LAST THREE YEARS 3 LAIDLAW ENVIRONMENTAL PROFILE - Diversified revenue base - more than 30% of revenues from non-hazardous industrial waste management - Low cost base - efficient operator - Expanding market share with 157 major corporate customers and entering related new markets services 4 OPERATING FACILITIES [MAP of North America with locations of Laidlaw Environmental Operating Facilities] - 53 SERVICE CENTERS - 7 INCINERATORS * 8 LANDFILLS - SPECIAL SERVICE LOCATIONS 5 SOURCES OF REVENUE(1) [Pie chart graphic] Specialty Services 18% Transportation 8% Incineration 20% Service Center 37% Landfill 17% (1) For the three month period ended November 30, 1998 and before intercompany eliminations. 6 PROVEN TRACK RECORD OF SYNERGY REALIZATION (1) ($ in millions) SYNERGIES ACHIEVED(2) IN ROLLINS MERGER --------------------- Personnel Reductions $48 Plant Closure 16 SG&A Reduction 8 --- Total Cash Savings (EBITA) 72 Depreciation Reduction 18 --- Total Savings (EBIT) $90 === (1) There is no assurance that cost savings will be realized following the proposed combination solely because LLE realized cost savings following prior transactions. (2) On an annualized basis. 7 STOCK HAS OUTPERFORMED THE MARKET SINCE MERGER ANNOUNCEMENT [Graphic indicating the performance of Laidlaw Environmental Stock compared with a peer group and the S&P 500] DAILY TRADING SINCE ANNOUNCEMENT OF ROLLINS MERGER GRAPHIC PLOTTING LAIDLAW ENVIRONMENTAL'S STOCK PRICE COMPARED WITH THE S&P 500 AND LAIDLAW ENVIRONMENTAL'S PEER GROUP 300% - - 300% 250% - - 250% 200% - - 200% 150% - - 150% 100% - - 100% 50% - - 50% JAN-97 MAR-97 JUN-97 AUG-97 NOV-97 JAN-98 --S&P 500 -- LAIDLAW ENVIRONMENTAL -- PEER GROUP 8 LAIDLAW ENVIRONMENTAL'S $30.00 OFFER PRICE $30.00(1) CONSIDERATION $18.00 CASH/$12.00 STOCK(1) COLLAR $4.28571 - $5.35714 TOTAL VALUE(2) $2.1 BILLION - ------------------------------------------------------------------------------------------------------------------ FINANCING T-D BANK COMMITMENT EXPECTED CLOSING FIRST QUARTER 1998 TAX TREATMENT POTENTIAL TAX DEFERRAL IF SAFETY-KLEEN BOARD AGREES TO MERGER APPROVALS CUSTOMARY SYNERGIES $100 - $130 MILLION (1) $18.00 in cash and $12.00 in LLE stock assuming LLE stock price remains within the collar ($4.28571-$5.35714). (2) Includes the assumption of $246 million of debt. 9 SIGNIFICANT UPSIDE POTENTIAL BASED ON EXPECTED SYNERGIES OF $100 - $130 MILLION ($ IN MILLIONS) ESTIMATED RANGE (1) ------------------- - - SG&A Reductions $45.0 - $60.0 - - Waste Internalization $13.5 - $25.0 - - Processing Site Consolidation $10.0 - $12.5 - - Service Center Consolidation $35.0 - $67.5 (1) There is no assurance that cost savings will be realized following the proposal combination solely because LLE realized cost savings following prior transactions. 10 SIGNIFICANT SYNERGY POTENTIAL [ Map of North America with the locations of Laidlaw Environmental and Safety-Kleen processing and service facilities] O Safety-Kleen * Laidlaw Environmental