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Stock Trading History of Twohig Michael J

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 Twohig Michael J since year 2005. The trader's CIK number is 1220474. At the time of this reporting, Twohig Michael J is the Sr. V. P.& Chief Info. Off. of Clean Harbors Inc (stock ticker symbol CLHB).

Stock purchases, sales, and option exercises reported by *Twohig Michael J* since 2005.
Trade Date	Symbol	Company Name (Issuer)	Trade Type	Shares	Price ($)	Value ($)
2006-12-12	CLHB	Clean Harbors Inc	Sale	4,500	45.94	206,730
2006-12-12	CLHB	Clean Harbors Inc	Option Exercise	4,500	9.72	43,740
2006-06-02	CLHB	Clean Harbors Inc	Sale	2,500	38.99	97,475
2006-06-02	CLHB	Clean Harbors Inc	Option Exercise	2,500	6.46	16,150

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 Twohig Michael J (Sr. V. P.& Chief Info. Off. of Clean Harbors Inc at the time of this reporting) see the Securities and Exchange Commission (SEC) website.