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Page 1 of 1 <br /> Vicki McCartney [EH] <br /> From: Vicki McCartney [EH] <br /> Sent: Wednesday, May 23, 2012 3:04 PM <br /> To: 'Barton, Jim@Waterboards' <br /> Cc: Nuel Henderson[EH] <br /> Subject: Well Destruction Work Plan for JIMCO <br /> Jim, <br /> Nuel asked me to review Well Destruction Work Plan for JIMCO Truck Plaza at 1022 Frontage Road in Ripon. <br /> Conestoga-Rovers and Associates (CRA) is proposing to pressure grout monitoring wells MW-3, MW-4, MW-5, <br /> MW-7, MW-12, MW-14, MW-18, MW-19 and MW-20. I have reviewed soil and groundwater analytical data and <br /> concluded that only MW-3, MW4, MW-5 and MW-18 can be pressure grouted. The remaining wells must be <br /> drilled out since petroleum hydrocarbon contamination was reported in soil analytical data when these wells were <br /> installed or current analytical data reported contaminants in the groundwater. <br /> When pressure grouting, instead of applying 25 pounds per square inch of pressure for 5 minutes, we <br /> recommend applying liquid grout pressure for 10 minutes. Also, the San Joaquin County Well Standards require <br /> that if the well casing is left in place during sealing operations, that"a hole at least one foot larger in diameter than <br /> the originally drilled hole shall be excavated around the outside of the well casing to a depth of 3 feet:below the <br /> ground surface, and;the well casing shall then be cut off 6 inches above the bottom of this excavation and <br /> removed. The grout used to fill the well shall be allowed to spill over into the excavation during the sealing <br /> operation, and fill it for a thickness of one foot and form a cap which has a diameter of at least one foot greater <br /> than the diameter of the originally drilled hole." This applies to all wells that are pressure grouted. <br /> I hope these comments are helpful. <br /> Vicki McCartney, Senior REHS <br /> San Joaquin County <br /> Environmental Health Department <br /> 1868 East Hazelton Avenue <br /> Stockton, California 95205 <br /> Phone: (209)468-9852 <br /> Email: vmccartney(a sjcehd.com <br /> 5/23/2012 <br />