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• k" KEEINFELDER <br /> k <br /> 40 feet bgs and none detected results at 50 feet bgs. Groundwater samples from monitoring wells <br /> in this area also were reported as non-detect for the requested petroleum constituents including <br /> oxygenates from first encountered groundwater. Based on these findings and the previous `No <br /> i Further Action" letter by the county and that the county was aware contamination remained at <br /> approximately 30 feet bgs (UST area), Kleinfelder does not recommend further remedial efforts in <br /> this area. <br /> 3. Kleinfelder recommends that a copy of this report should be submitted to San Joaquin County <br /> Public Health Services Department, Environmental Health Division (PHS/EHD) and the State of <br /> California, Central Valley Regional Water Quality Control Board (RWQCB) for their review and <br /> s comment. <br /> j 4. The equipment decontamination rinseate, purge water and drilling returns (soil) currently stored on- <br /> site should be properly disposed of by the Client. Kleinfelder can assist the Client in that disposal at <br /> an additional charge if requested. <br /> i <br /> SJC/MVCD requested Kleinfelder to address recommendation No. 1, listed above concerning a <br /> steam clean area and UST stockpile. Plate 2 shows former soil sampling locations associated <br /> with these two areas. Tables 2 and 3 summarize previous analytical results near the steam clean <br /> area and Table 4 summarize Kleinfelder's previous UST stockpile soil sampling results. The <br /> following work was conducted as generally described in Kleinfelder's proposal titled <br /> i "Proposal/Cost Estimate, Steam Clean Sump Removal/Over Excavation and Stockpile Removal, <br /> Mosquito Abatement Property, 200 North Beckman Road, Lodi, California,". (File Number <br /> ST04P073) dated February 20, 2004. <br /> d <br /> FIELD ACTIVITIES <br /> Former UST Stockpile Removal and Disposal <br /> RAH Environmental of Loomis, California (RAH) visited the site on April 5 and 6, 2004 to <br /> remove an existing soil stockpile generated from a former underground storage tank (UST) <br /> excavation. The soil was profiled for waste acceptance to Forward Landfill located in Stockton, <br /> California based on Kleinfelder's four-point composite sample collected and analyzed from this <br /> stockpile (see Table 4). The composite sample was analyzed for total petroleum hydrocarbons as <br /> referenced to gasoline, (TPH-G), diesel (TPH-D), motor oil (TPH-MO), total lead and for <br /> benzene, toluene, Ethylbenzene, and total xylenes (BTEX). TPH-D and TPH-MO were detected <br /> at 83 and 190 mg/kg, respectively. Total lead was detected at 12 mg/kg. The remaining <br /> requested analytes were none detected at or above the laboratory reporting limits. <br /> Approximately 75 cubic yards of the previously stockpiled UST soil was removed on April 5, <br /> and 6, 2004 by RAH and transported to Forward landfill. Hazardous waste manifests are <br /> contained in Appendix C. Plate 2 shows the location of the former soil stockpile. <br /> Excavation Observation and Soil Sampling <br /> Mr. Chris Dekorver Staff Geologist visited the site on April 6 and 7, 2004 to observe removal of <br /> ja steam clean area sump and excavation of soil beneath the sump and adjacent concrete steam <br /> i <br /> tl 42747703 1 ST04RS82 Page 5 of 9 <br /> P Copyright 2004,Kleinfelder,Inc. July 2,2004 <br /> S <br />