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y 4 <br /> KEI-PS9-1104 .P2 <br /> January 10, 1990 <br /> Page 3 <br /> Analyses of vapor piping trench samples indicate non-detec- <br /> table levels of TPH as gasoline for sample VI, and 4 . 2 ppm <br /> TPH as gasoline for sample V2, with non-detectable levels of <br /> EDB in each case. <br /> SITE DESCRIPTION: <br /> A. A Location Map taken from a California State Automobile <br /> Association road map is attached to this work plan. <br /> B. A Site Pian (including adjacent streets, site building <br /> locations, tank locations, island locations and associated <br /> piping, and underground utilities) is attached to this work <br /> plan. <br /> PLAN FOR DETERMINING GROUND WATER CONTAMINATION: <br /> A. KEI proposes to install four two-inch diameter monitoring <br /> wells using hollow stem auger equipment. Permits will be <br /> obtained from the San Joaquin County Public Health Services <br /> as necessary prior to beginning work. <br /> The wells will be drilled 15 feet into the saturated zone of <br /> the first encountered ground water unless a five foot thick <br /> clay aquitard is encountered first, at which time drilling <br /> will be terminated. <br /> B. Soil samples will be collected at a minimum of five foot <br /> intervals and changes in lithology beginning at a depth of <br /> five feet below grade. Sampling will continue until the <br /> first water table is encountered. Classification of soil <br /> will be done using the Unified Soils Classification System <br /> (USCS) by KEI's field engineer or geologist. Samples will <br /> be collected in a California modified split-spoon sampler <br /> with two-inch diameter brass liners. The sampler will be <br /> advanced ahead of the drilling augers at designated depths <br /> by dropping a 140 pound hammer 30 inches. Blow counts will <br /> be recorded. The samples will be removed from the sampler, <br /> retained in the brass liners, and sealed with aluminum foil , <br /> plastic caps and tape. They will be labeled and stored on <br /> ice for delivery to a state certified laboratory. <br /> Finalized boring logs will be prepared from field logs and <br /> submitted to the San Joaquin County Public Health Services, <br /> and to the Regional Water Quality Control Board (RWQCB) , <br /> Central Valley Region. <br />