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Ms. Glend 2 1 16, 1990 <br /> According to the Leaking Underground Fuel Tank (LUFT) Field Manual in areas <br /> where the depth to ground water is less than 5 feet from soil <br /> contamination, a "Category 3" investigation is required. The Preliminary <br /> Investigation of Ground Water proposal for the PDM site which was submitted <br /> to San Joaquin County, conforms to the Category3 Guidelines. No agency <br /> response to this proposal for ground water investigation has b <br /> Canonie has contacted the San Joaquin County Flood Control District which <br /> monitors ground water levels, and develops ground water gradient maps for <br /> San Joaquin County. A representative of the district reported a <br /> predominately westerly flow for ground water in the area of the PDM site. <br /> An existing monitoring well , MW-2 (Figure 1) was constructed in this <br /> downgradient location in the immediate influence of the former tank. area <br /> (within 2 feet of excavation limits) . Samples were obtained from <br /> Monitoring Well MW-2 following completion of the soil removal , and results <br /> of this sample was reported in Canonie Environmental Services Corp. , 1989, <br /> "Soil Remediation Report, PDM Strocal Inc. 's Site, Stockton, California, <br /> August". This sample indicated non-detectable concentrations of petroleum <br /> products. A well sample taken on May 4, 1989 also indicated nondetectable <br /> concentrations of diesel fuel . MW-2 was sampled by Beta Associates in <br /> August 1987. This sampling also indicated nondetectable concentrations of <br /> diesel fuel . <br /> These low concentrations of diesel fuel in soil , the lack of detectable <br /> concentrations in a down gradient monitoring well , and the removal of the <br /> source area support the conclusion that soil removal is complete. <br /> Item B: Soil Remediation Options <br /> Canonie will evaluate several remedial options for soil which was <br /> stockpiled on-site during the excavation of the former tank pit. <br /> Approximately 260 cubic yards of soil with an average concentration of 208 <br /> mg/kg will require treatment or disposal . Canonie will evaluate the <br /> following options on the basis of cost and effectiveness: <br /> 1. No further action; <br /> 2. Disposal at a Class III landfill with no treatment; <br /> 3. Disposal at a Class I landfill with no treatment; <br /> 4. Reduction of fuel levels by enhanced biological degradation; <br /> 5. Solidification and disposal at Class III landfill ; <br /> 6. On-site fixation. <br /> The results of the cost and effectiveness analysis will be reported to PDM, <br /> along with Canonie's recommended remedial option. <br /> CanonieEnvironmental <br />