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i ISite Background Information • TERMINOUS MARKET 13889 West Highway 12, Lodi, California BACKGROUND The property at 13889 West Highway 12,Lodi,California is currently utilized as Terminous Market The site is occupied by a one-story market with a septic tank, a residential dwelling with a septic tank, a tool shed and outhouse, a propane tank, and a domestic well which, according to property owner Charles Jacobs, is not used for drinking water The site is bordered on the west by the Mokelumne River, and on the north, south, and east by agricultural property The facility, established in 1939, formerly operated two fuel underground storage tanks (USTs) and two fuel dispensers The former USTs consisted of one 550-gallon unleaded gasoline UST and one 550-gallon leaded gasoline UST REGIONAL GEOLOGIC/HYDROGEOLOGIC SETTING The site is situated within the Great Valley Geomorphic Province of California, a large, elongate, northwest-trending, asymmetric structural trough This province has been filled with thick sequences of sediment ranging in age from Jurassic to Recent, creating a nearly flat-lying alluvial plain that extends from the Tehachapi Mountains in the south to the Klamath Mountains in the north The California Coast Range and the Sierra Nevada comprise the western and eastern boundaries of the province, respectively The thickness of the sedimentary fill ranges from thin veneers along the I valley edges to more than 20,000 feet in the south central portion of the valley Older deposits are primarily marine in origin, while the younger deposits are continental Continental-denved sediments, originating in the surrounding mountain ranges, were typically deposited in lacustnne, I fluvial, and alluvial environrrients (Olmsted and Davis, 1961) Rocks composing the basement complex of the province have not been completely defined, but are believed to metamorphic and igneous in origin The Modesto, Riverbank, and Turlock Lake Formations and overlying Recent alluvium are the 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 nearest surface water feature in the vicinity of the property is an irrigation drainage ditch, located approximately 120 feet south of Terminous Market, and the Mokelumne River, located ' approximately 2,500 feet west of the site Based on data collected during quarterly ground water monitoring events, depth to water at the site ' occurs between 3 feet and 6 feet below surface grade(bsg)and typically flows toward a depression in the vicinity of monitoring well MW-3 I • Advanced GeoEnvironmental,Inc I