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' Site Background Information Ripon Farm Service 22871 South Highway 99 Ripon, California The site, 22871 South Highway 99 in Ripon, California has been operated by Ripon Farm Service (RFS) for at least 40 years. Hydrocarbon fuels were stored .and dispensed at the site for approximately 25 years. SITE LOCATION ' The site is located in a flat industrial/commercial area in northern Ripon, south of Jack Tone Road. The site is currently operated by RFS.A former automotive shop is located near the northeast corner ' of the site, an office building and truck scale are located at the southern corner. The surface of the remainder of the site is covered with gravel. The Jimco Truck Stop is located immediately north of the site. ' REGIONAL GEOLOGICAL/HYDROGEOLOGICAL SETTING The site 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 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. 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). This basin is drained primarily by the San Joaquin River. 1 ' LOCAL GROUND WATER SETTING The closest surface water feature to the site is the Stamslaus River located approximately 9,000 feet south of the site: The river is used primarily for agricultural use and recreational boating. Ground water is currently encountered at a depth of approximately 26 feet below surface grade(bsg) at the site, and has a northerly flow direction. Ground water has occurred at level as high as 15 feet bsg. ' Advanced GeoEnvironmental,Inc.