36. Clean Harbors

Headquarters: Norwell Sector: Services Symbol / Exchange: CLHB / Nasdaq Employees: 4,769 RANK 18/100 Chief executive: Alan S. McKim Market value: $1.33 billion RANK 34/100 2007 revenue: $946.9 million RANK 33/100 2007 net income: $44.0 million RANK 43/100 On the net: cleanharbors.com

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