X0303 4 2009-12-15 0 0000911177 CASELLA WASTE SYSTEMS INC CWST 0001055352 CASELLA JOHN W C/O CASELLA WASTE SYSTEMS 25 GREENS HILL LANE RUTLAND VT 05701 1 1 0 0 Chief Executive Officer Class A Common Stock 2009-12-15 4 S 0 29900 4.0617 D 273539 D Class A Common Stock 2009-12-16 4 S 0 7600 4.0104 D 265939 D Class A Common Stock 694 I See Footnote Class A Common Stock 91246 I See Footnote Price reported represents the weighted average price of shares sold. Shares were sold at prices in the range of $3.99 to $4.23. Mr. Casella hereby undertakes, upon request of the Staff of the U.S. Securities and Exchange Commission, the issuer of a security holder of the issuer, to provide full information regarding the number of shares sold at each separate price. Price reported represents the weighted average price of shares sold. Shares were sold at prices in the range of $3.99 to $4.05. Mr. Casella hereby undertakes, upon request of the Staff of the U.S. Securities and Exchange Commission, the issuer of a security holder of the issuer, to provide full information regarding the number of shares sold at each separate price. Held by Mr. Casella's spouse. Mr. Casella disclaims beneficial ownership of the securities indicated to the extent to which he does not have an actual pecuniary interest in such securities. Held in trust for the benefit of Mr. Casella's minor children. Mr. Casella disclaims beneficial ownership of the securities indicated to the extent to which he does not have an actual pecuniary interest in such securities. Shelley S. Rogers, Attorney in Fact for John W. Casella 2009-12-17