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Jim Fisk Page 2 <br /> PHS/EHD has completed review of the Site Remediation Report prepared by Upgradient Environmental <br /> Consultants dated December 15, 1995. The report contains analytical information (soil results) <br /> obtained in November 1995 during overexcavation of contaminated soil from the former <br /> dispenser/piping location. The soil removal reduced the gasoline mass volume significantly with little <br /> need of further remedial measures in the soil vadose zone. <br /> An active on site product well currently exists and is within 250 feet of gasoline contaminated soil. San <br /> Joaquin County Department of Public Works depth to groundwater maps recorded a level of 35 feet <br /> bgs at this site in 1993. At the time of the overexcavation, gasoline odor and PID measurements <br /> indicated soil contamination was present in the excavation at 35 feet (bgs). Due to the verticle <br /> extenttdepth of the gasoline contaminated soil and the depth to groundwater in 1993, PHS/EHD <br /> requires a groundwater investigation be performed to determine if groundwater has been impacted. <br /> Overexcavation confirmation samples JL-P-13 (24 feet bgs) and JL-P-15 (12.5 feet bgs) tested positive <br /> for residual gasoline. The west wall of the excavation, where the samples were collected, could not be <br /> extended during excavation because of an existing building. The lateral extent of soil contamination to <br /> the west under the existing building was not fully defined. Further soil investigation may be warranted <br /> in this area of sample JL-P15 (TPH-Gas 4200 ppm). <br /> PHS/EHD requires a work plan and permit application with fees be submitted to this office for review <br /> and approval prior to any drilling or sample collection. <br /> If you have any further questions regarding this matter, contact Harlin Knoll, at (209) 468-3442. <br /> Donna Heran, REHS, Director <br /> Environmental Health Division <br /> Harlin Knoll, Senior REHS Margare Lagono, REHS <br /> Site Mitigation Unit Lead Senior <br /> HK:jlmkt3 <br /> c: SWRCB - George Lockewood <br /> c: CVRWQCB - Elizabeth Thayer <br /> c: Upgradient Environmental Consultants <br />