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Stock Trading History of Robertson Andrea

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 Robertson Andrea since year 2005. The trader's CIK number is 1295248. At the time of this reporting, Robertson Andrea is the Director of Clean Harbors Inc (stock ticker symbol CLHB).

Stock purchases, sales, and option exercises reported by *Robertson Andrea* since 2005.
Trade Date	Symbol	Company Name (Issuer)	Trade Type	Shares	Price ($)	Value ($)
2007-05-15	CLHB	Clean Harbors Inc	Sale	1,000	46.63	46,630
2007-05-15	CLHB	Clean Harbors Inc	Option Exercise	3,000	7.52	22,560
2006-01-03	CLHB	Clean Harbors Inc	Option Exercise	1,000	7.52	7,520

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 Robertson Andrea (Director of Clean Harbors Inc at the time of this reporting) see the Securities and Exchange Commission (SEC) website.