X0304 4 2011-09-23 0 0000822818 CLEAN HARBORS INC CLH 0001470669 Lefebvre Marvin G NE 21 83 23 W5 GRIMSHAW A0 T0H 1W0 ALBERTA, CANADA 0 1 0 0 EVP (CHI sub) Common Stock 2011-09-23 4 S 0 2500 51.35 D 62660 D Common Stock 2011-09-23 4 S 0 2500 51.20 D 60160 D Common Stock 2011-09-23 4 S 0 8 51.30 D 29466 I Owned by wife Common Stock 2011-09-23 4 S 0 180 51.25 D 29286 I Owned by wife Common Stock 2011-09-23 4 S 0 4812 51.20 D 24474 I Owned by wife Common Stock 114552 I Owned by RVE Holdings Ltd. Amount of securities beneficially owned reflects a two-for-one split on July 6, 2011 of the Company's common stock in the form of a stock dividend of one share for each outstanding share. Marvin Lefebvre 2011-09-26