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Q2 2013 Financial Results

19 Safety-Kleen Adding Substantial Value... ■ ◉ $1.25B deal successfully completed on 12/28/12 Greatly enhances overall growth potential Multiple factors support overall success of the deal: Drives increases in hazardous waste volumes safety-kleen. A Clean Harbors Company Combines small quantity generators with medium and large Generates significant cross-selling opportunities Strengthens our commitment to recycling/sustainability Capitalizes on strong cultural fit Achieves substantial cost synergies Clean Harbors

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