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Mar. 14. 2008 1:58PM <br />ENVIRONMENTAL RISK *VICES <br />CORPORATION <br />N o. 2 2 1 9 P. 2 <br />ers <br />o7.4.,,A <br />DATE: March 14, 2008 <br />ATTENTION: Harlan Knoll <br />ADDRESS: San Joaquin County Environmental Health Department <br />600 East Main Street <br />Stockton, CA 95202-3029 <br />FROM: Jim Durkin <br />CONTENTS: Well Permit Application; Licensed Contractor Declaration; Master File <br />Record Information; Maps showing work locations. <br />CC: Jose Salcedo, DTSC; Jim Brownell, RWQCB-CVR <br />MESSAGE <br />Mr. Knoll — <br />ERS Corp. proposes to drill approximately nine direct-push soil borings at each of three <br />locations at Rough and Ready Island (RRI), for a total of 27 borings. The three sites are located <br />in the Central Island Area of RRI (see attached Figures A-1 through A-4). The maximum depth <br />of boring is estimated at 12 feet below ground surface. ERS estimates that this work will take <br />approximately three days, beginning Friday, March 21 and ending Tuesday, March 25. <br />1600 Riviera Avenue, Suite 310, Walnut Creek, California 94596 <br />925 938 1600— erscorp.us