 GREENWICH, Conn.--BUSINESS WIRE--Littlejohn Co. LLC, a private investment firm based in Greenwich, CT, today announced the successful completion of its sale of HydroChemPSC HPC or the Company, a leading provider of industrial cleaning, specialty maintenance and utilities services with more than 240 service locations throughout the United States, to Clean Harbors, Inc. Clean Harbors NYSE: CLH for 1.25 billion in cash. Since Littlejohns initial investment in PSC in 2014, HPC 