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CHI Development Group LLC 6282.002.000 <br /> South Lathrop Commerce Center (SLCC) June 26, 2018 <br /> MONITORING WELL DESTRUCTION Page 2 <br /> As summarized in the above-referenced Work Plan, the well casings for MW-S1, MW-S2, MW-S3, <br /> MW-S4 and MW-S5 were 2-inch-diameter PVC and were screened from approximately 10 to <br /> 20 feet below the ground surface (bgs). The tops of the wells were protected by metal standpipes <br /> and were encased in concrete at the ground surface. A licensed drilling contractor removed the <br /> metal standpipes and then overdrilled the well to the bottom of the previous boring (approximately <br /> 21 feet). Drilling was done using a truck-mounted hollow stem auger drill rig equipped with <br /> 8-inch-diameter augers in order to remove the annular seals around the wells. Drilling cuttings <br /> were placed on the ground surface near the wells. Once the well materials were adequately <br /> removed, the boreholes were grouted with neat cement using the tremie method to approximately <br /> 3 feet bgs. <br /> The attached permit indicates that the County was satisfied with the well abandonment <br /> procedures. Based on our observations, it is our opinion that the well destruction as described <br /> herein was accomplished in general conformance with the requirements of the San Joaquin <br /> County Environmental Health Department and the above-referenced work plan. A completed <br /> Department of Water Resources (DWR) Well Completion Report is attached. <br /> If you have any questions or comments regarding this letter, please call and we will be glad to <br /> discuss them with you. <br /> Sincerely, <br /> QROFESS/p�, <br /> ENGEO Incorporated � �F�E HA <IN <br /> s 2 <br /> Li No. 2804 Fn <br /> avL <br /> Ana Lua Iteve Harris, GE �gTF TeCHN��O��P <br /> OF CAS <br /> al/sh/cjn <br /> Attachments: Site Plan <br /> Completed San Joaquin County Well and Boring Permit <br /> cc: Mr. Lor Xiong, San Joaquin County Environmental Health Department <br />