Stock Trading History of Mckim Alan S

The following table details the trading activities (stock purchases, stock sales, and stock option exercises) reported to the Securities and Exchange Commission (SEC) by insider Mckim Alan S since year 2005. The trader's CIK number is 1024547. At the time of this reporting, Mckim Alan S is the Chairman of the Board of Clean Harbors Inc (stock ticker symbol CLHB).

Stock purchases, sales, and option exercises reported by *Mckim Alan S* since 2005.
Trade Date	Symbol	Company Name (Issuer)	Trade Type	Shares	Price ($)	Value ($)
2007-12-19	CLHB	Clean Harbors Inc	Sale	38,541	52.35	2,017,621
2007-12-14	CLHB	Clean Harbors Inc	Sale	500	51.85	25,925
2007-12-12	CLHB	Clean Harbors Inc	Sale	32,314	52.03	1,681,297
2007-12-13	CLHB	Clean Harbors Inc	Sale	28,645	51.67	1,480,087
2006-07-31	CLHB	Clean Harbors Inc	Sale	28,322	36.93	1,045,931
2006-08-02	CLHB	Clean Harbors Inc	Sale	19,600	36.21	709,716
2006-08-01	CLHB	Clean Harbors Inc	Sale	31,778	36.18	1,149,728
2006-07-26	CLHB	Clean Harbors Inc	Sale	24,377	36.95	900,730
2006-07-27	CLHB	Clean Harbors Inc	Sale	18,900	36.78	695,142
2006-07-28	CLHB	Clean Harbors Inc	Sale	26,900	36.85	991,265
2006-07-21	CLHB	Clean Harbors Inc	Sale	20,500	36.33	744,765
2006-07-24	CLHB	Clean Harbors Inc	Sale	39,978	36.55	1,461,195
2006-07-25	CLHB	Clean Harbors Inc	Sale	36,900	37.13	1,370,097
2006-07-18	CLHB	Clean Harbors Inc	Sale	37,345	36.27	1,354,503
2006-07-19	CLHB	Clean Harbors Inc	Sale	45,200	37.31	1,686,412
2006-07-20	CLHB	Clean Harbors Inc	Sale	37,400	37.02	1,384,548
2006-07-14	CLHB	Clean Harbors Inc	Sale	64,125	36.28	2,326,455
2006-07-17	CLHB	Clean Harbors Inc	Sale	29,274	36.21	1,060,011
2006-07-13	CLHB	Clean Harbors Inc	Sale	47,900	36.81	1,763,199
2006-07-12	CLHB	Clean Harbors Inc	Sale	46,800	37.70	1,764,360
2006-07-11	CLHB	Clean Harbors Inc	Sale	28,800	38.10	1,097,280
2006-07-10	CLHB	Clean Harbors Inc	Sale	15,900	38.91	618,669
2005-06-30	CLHB	Clean Harbors Inc	Sale	130,061	21.58	2,807,106
2005-06-27	CLHB	Clean Harbors Inc	Sale	159,800	22.10	3,530,781
2005-06-23	CLHB	Clean Harbors Inc	Sale	110,139	23.50	2,587,715

Insider trading activities including stock purchases, stock sales, and option exercises listed in the above table cannot be completely guaranteed as to their accuracy. For more information regarding the trades made by Mckim Alan S (Chairman of the Board of Clean Harbors Inc at the time of this reporting) see the Securities and Exchange Commission (SEC) website.