 NORWELL, Mass.--BUSINESS WIRE--Clean Harbors, Inc. Clean Harbors NYSE: CLH today announced the completion of its acquisition of HydroChemPSC HPC, a leading U.S. provider of industrial cleaning, specialty maintenance and utilities services. Clean Harbors purchased HPC from an affiliate of Littlejohn Co., LLC, for 1.25 billion in an all-cash transaction. The acquisition was financed through a combination of existing cash and proceeds from Clean Harbors new 2021 Incremental Ter 