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Site Background Information TRACY MARINE SALES 2353 Toste Road, Tracy, California The site is located in a business/agricultural area of western Tracy, California, in San Joaquin County The property is located in a highway-retail business development owned by Mr Joe Toste, E Jr A large showroom/office structure for marine sales is located on the property The northern edge of the property lies adjacent to Interstate 205 and the southern edge is adjacent to Toste Road REGIONAL GEOLOGICAL/HYDROGEOLOGICAL SETTING The site is situated within the Great Valley Geomorphic Province of Califorma, a large, elongate northwest tending, asymmetric structural trough The Great Valley Province has been filled with thick sequences of sediment ranging in age from Jurassic to Recent, creating a nearly flat lying alluvial plain extending from the Tehachapi Mountains in the south to the Klamath Mountains in the north The western and eastern boundaries of this province are comprised of the California Coast Range and the Sierra Nevada,respectively Rocks composing the basement complex of the province have not been completely defined but are believed to be of metamorphic and igneous origin The Great Valley Province has been subdivided into two major divisions identified as the Sacramento and San Joaquin Valleys Based on the General Soil Map from the San Joaquin County Soil Survey,published by the United States Department of Agriculture Soil Conservation Service in 1992, the site is situated within an area of Capay clay soil Capay clay is located in mterfan basin or alluvial fan areas, and generally consists of very deep,moderately well-drained grayish brown and dark grayish brown clay The soil Iformed in alluvium derived from mixed rock sources The Modesto, Riverbank and Turlock Lake Formations and overlying Recent alluvium are the I principal sources of domestic ground water in the 13,500-square mile San Joaquin Valley Ground Water Basin (Basin 5-22) This basin is drained primarily by the San Joaquin River The nearest surface water feature in the vicinity of the property is the Old River approximately 1,300 feet north of the site Ground water at the site is currently encountered at a depth of approximately 6 to 8 feet below surface grade (bsg), and has a northerly flow direction WELL SURVEY On 08 representativeSe tember 2000,a of AGE performed a reconnaissance of visually observable September potential receptors within a 2,000-foot radius of the above referenced site Four domestic water wells were observed during the visual search Two domestic water wells were observed at 2450 and 2480 . Toste Road The remaining two domestic water wells were observed at 2040 and 2120 Grant Line Road Additionally, 18 ground water monitoring wells were observed at 3 different locations Advanced GeoEnvironmental,Inc