 NORWELL, Mass.--BUSINESS WIRE--Clean Harbors, Inc. NYSE: CLH, the leading provider of environmental and industrial services throughout North America, will host its second-quarter 2021 financial results conference call on Wednesday, August 4, 2021 at 9:00 a.m. ET. On the call, Chairman, President and Chief Executive Officer Alan S. McKim, Executive Vice President and Chief Financial Officer Michael L. Battles, and Senior Vice President of Investor Relations Jim Buckley will discuss Clean Har 