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SLAKEY BROTHERS, STOCKTON <br />WKA No. 2200.32 <br />August. 12, 1993 <br />Page 2 <br />All samples were obtained under the direction of Ms. Briggs. The UST excavation samples were <br />obtained by driving a clean, two-inch diameter brass tube into soil taken from the sample location <br />with a backhoe bucket. The sample tubes were sealed with polytetrafluoroethylene (PTFE) - <br />coated sheets, plastic end caps and duct tape to reduce volatile hydrocarbon loss. The samples <br />were placed in an ice chest with ice and submitted under chain -of -custody documentation to a <br />California -certified laboratory. Soil samples were analyzed for Total Petroleum Hydrocarbons as <br />diesel and motor oil using Modified EPA method 8015 Extraction and Benzene, Toluene, <br />Ethylbenzene, and Total Xylenes (BTEX), using EPA method 8020 Purge -and -Trap. <br />Observations <br />The UST appeared in good condition with no holes or pits observed in the tank walls. the tank <br />was of steel construction. The soil beneath and around the perimeter of the UST consisted of <br />medium brown silty clay; no odor or discoloration was observed in the samples obtained beneath <br />the UST. <br />Findines <br />Laboratory results for the soil samples collected beneath the former UST revealed no detectable <br />concentrations of TPH-diesel, TPH motor oil, or BTEX. Analysis of the sample obtained from <br />the stockpiled soil revealed TPH-diesel concentrations of 67 µg/g. Laboratory results are <br />summarized below in Table 1. Complete laboratory analytical results and chain -of -custody <br />documentation are appended. <br />`0% <br />WALLACE •KUHL <br />&ASSOCIATES INC. <br />