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Site Background Information Former BLUE STAR GASOLINE 4040 East Main Street, Stockton, California BACKGROUND The site,previously utilized as a gas station and mini mart, is bounded on the north by Main Street and on the east by Oro Avenue.A single building formerly occupied the central portion of the site; a concrete foundation currently remains. Residential and commercial properties are located north beyond Main Street and south of the site. Three underground storage tanks (USTs) and two dispensers had operated on-site for approximately 40 years; they were removed by AGE in March 2002. REGIONAL GEOLOGIC/HYDROGEOLOGIC CONDITIONS According to Geologic Map of California,published in 1977 by the State of California Department of Mines and Geology, the site area is located within the Great Valley Geomorphic Province of California.The Great Valley Province is a nearly flat,elongated structural trough trending northwest and southeast for approximately 450 miles;it is bounded on the east by the Sierra Nevada mountains and on the west by the Coast Ranges. The Province has been filled to its present elevation with thick sequences of sediment ranging in age from Jurassic to present day,creating a nearly flat-lying alluvial plain extending from the Tehachapi Mountains in the south to the Klamath Mountains in the north. The surficial and upper several hundred feet of subsurface layers consists of a great thickness of predominantly unconsolidated alluvial and flood plain deposits (primarily sands, silts, and clays) of Quaternary age, which are derived from the granitic mountains of the Sierra Nevada. Beneath the upper sedimentary deposits lies a thick sequence of marine deposits of Mesozoic age. These marine deposits are further underlain by a pre-Jurassic complex of igneous and metamorphic basement rock. The Province is subdivided into two major divisions, designated the Sacramento and San Joaquin Valleys. The San Joaquin Valley is drained primarily by the San Joaquin River, and the Modesto, Riverbank, and Turlock Lake Formations and overlying Recent alluvium are the principal sources of domestic ground water in the 13,500-square mile San Joaquin Valley Ground Water Basin (Basin 5-22).The nearest surface water feature in the vicinity of the property is Mormon Slough and the Stockton Diverting Channel, located approximately 1,500 feet south and 2,000 feet east of the site, respectively. Based on the United States Department of Agriculture-Natural Resources Conservation Service's Web Soil Survey map,surface sediment at the site area is classified as Galt-Urban land complex.The Galt Series consists of moderately deep,moderately well drained soils that formed in fine textured alluvium from mixed but dominantly granitic rock sources. Galt soils are on low terraces, basins, and basin rims. Advanced GeoEnvironmental,Inc.