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4703 Moreland Court,Stockton,Callrornla <br /> Delta Project No.4o-88.146 <br /> P&P 3 j <br /> � r <br /> Stockton lies within the Great Valley geomorphic <br /> province. <br /> 'ne geologic materiab beneath the <br /> valley surface consist Primarily of stream and Delta plain deposits of the San Joagwn giver and its <br /> tributaries (Norris and Webb, 1976). Surficial geology of the region as depicted on the Geologic <br /> Map of California consists of fluvial sands, silts, and clays ('ennings, e.t.. al., 1977), and is <br /> considered to be several hundred feet thick. <br /> I <br /> A regional map showing the ground water elevation contours for the unconfined aquifer for fall <br /> 1986,prepared by the California Department of Water Resources,shows that ground water east of <br /> the San Joaquin River gr,.ne.rally flows toward the southwest. ' <br /> - <br /> Subsurface geology at the site has been We from drilling and sampling six soil borings B-1 <br /> through 1$-6 to a total depth of 26 feet. Sail borings B-I through B-4 were drilled near the former <br /> underground storage tanks. Soil borings B-5 and B-6 were drilled at the proposed locatioth <br /> new tom, n o <br /> The soils consisted of silty clay,clayey sift,and sandy sift..Silty clay was observed below the surface s <br /> ' g asphalt in an six soil borings and ranged between 2 and 10 feet thick. The soils underlying the silty <br /> clay:were primarily composed of clayey silt with lenses of sandy silt and silty clay. . i <br /> - 0 NA <br /> 3 .. <br /> The soil sampling was directed b al�elta <br /> Y geologist. A brass sample tube was used to collect soil <br /> samples at both the fill and nonfill ends of each tank a <br /> ` Pproximately 2 feet below the bottom of the <br /> 1. tank excavation. Six soil samples were collected along the trenching of the excavated product lines. <br /> The samples were visually and manually classified in the field in accordance with <br /> ASTIvL 13248s- <br /> f 84. Representative portions of the samples were placed in glass jars and sealed for screening with <br /> a photoionization detector. <br /> The soil samples collected were sent to Eureka Uboratories,Inc.,in Sacramento,California. All soil <br /> samples were analyze <br /> d for TPI3,BTX,EDB,and organic lead. <br /> F - _ - <br /> . <br /> w1P <br />