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1 �--, Site Background Information QUICK N SAVE #2 2057 South El Dorado Street, Stockton, California INTRODUCTION The site is located on the west side of South El Dorado Street and is bounded on the north by Delhi Street, in an area of low topographic relief at an elevation of approximately 10 feet above mean sea level in the City of Stockton, California(Figure 1). The surrounding area is utilized for residential and light commercial purposes. Currently the site is being utilized as a gasoline refueling station.and mini mart. r REGIONAL GEOLOGIC/HYDROLOGIC SETTING f, The property is situated within the Great Valley Geomorphic Province of California, a large, elongate, northwest trending, asymmetric structural trough. The Great Valley Province has been filled with thick sequences of sediment ranging in age from Jurassic to Recent,creating a neariy flat- lying alluvial plain that extends 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 f complex of the province have not been completely defined but are believed to be inetamorphic and igneous in origin. The northern and southern portions of the Great Valley Province have been designated the Sacramento and San Joaquin Valleys, respectively. 1 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 area is within the E Jackson-Hallenbeck-Stockton (JHS) association. The JHS soils are located within basins, and generally consist ofmoderately-to poorly-drained,fine-textured soils.The soils are`generally derived from both marine and non-marine sediment, and are typically formed in alluvium derived from mixed rock sources. { The Modesto, Riverbank, and Turlock Lake Formations and overlying Recent:'alluvium are the F principal source 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 closest surface water features to the site are the San Joaquin River and Walker Slough,located approximately 4,500 feet southwest of the site.Water from the site drains into the San Joaquin River r Deep Water Channel,which is primarily used for commercial and recreational boating. Based upon well information obtained from the most recent quarterly monitoring event(August 2004), ground water flow direction is toward the east-southeast and is currently occurring at a depth of approximately 31 feet to 32 feet below surface grade (bsg). +� Advanced GeoEnvironmental,Inc. S