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Gardner <br />Page 2 <br />Residual soil contamination above or below the groundwater can potentially continue to <br />contaminate groundwater, affecting the total time it will take to remediate contaminated <br />groundwater. The statement that soil samples collected at the 12 foot level below <br />groundwater does not accurately indicate that the soil samples were collected at the <br />water/air interface. In fact shortly after the excavation, depth to groundwater was <br />measured to be approximately 4.5 feet below ground surface. Prior to the excavation <br />depth to groundwater in this area has been as low as 12.5 feet below ground surface. <br />Please provide further information regarding the backfill of the excavation. With regards <br />to the soil excavated, please evaluate the cost-effectiveness of remediation on site under <br />authority of the San Joaquin Valley Unified Air Pollution Control District or disposal off <br />site. <br />PHS/EHD concurs with the recommendation to continue the investigation of the vertical <br />and horizontal extent of soil contamination. Please submit by December 29, 1995 a <br />work plan to continue the investigation and to either remediate or dispose of excavated <br />soil. <br />If you have any questions or comments, please contact Mary Meays at (209) 468-0337. <br />Donna Heran, REHS, Director <br />Environmental Health Division <br />'4/1 "171A-e-cc-6 <br />Mary Meays, Senior REHS Diane M. Hinson, REHS <br />Site Mitigation Unit <br />Supervisor <br />MM\26056TH0R <br />c: Elizabeth Thayer, Central Valley RWQCB <br />c: Tom Lutterman, Smith Environmental <br />c: Al Hoslett, Wilson, Hoslett and Whitridge <br />C: Ron Rail, San Joaquin County Utilities Maintenance Districts