Exhibit 2.2 FIRST AMENDMENT TO ACQUISITION AGREEMENT WHEREAS, Safety-Kleen Services, Inc. (the "Seller") and Clean Harbors, Inc. (the "Purchaser"), are parties to an Acquisition Agreement dated as of February 22, 2002 (the "Acquisition Agreement");...Acquisition Agreement • March 19th, 2002 • Clean Harbors Inc • Hazardous waste management
Exhibit 4.21 AMENDMENT OF SECURITIES PURCHASE AGREEMENT WHEREAS, CLEAN HARBORS, INC., a Massachusetts corporation (the "Company"), is party to a Securities Purchase Agreement dated as of April 12, 2001 (the "Purchase Agreement") among the Company and...Securities Purchase Agreement • March 19th, 2002 • Clean Harbors Inc • Hazardous waste management
