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i Site Background Information ERNIE'S GENERAL STORE I4407 East Waterloo Road, Stockton, California The site is located at 4407 East Waterloo Road in Stockton, California (Figure 1) The property is currently occupied by a one-story grocery market and a gasoline fueling facility Five fuel dispensers are located south of the market,four fuel dispensers are located east of the market and two fuel USTs are located southeast of the market Presently the facility operates one split 15,000-gallon UST containing 10,000 gallons of diesel fuel and 5,000 gallons ofpremium unleaded fuel and one 15,000- gallon UST containing regular unleaded fuel REGIONAL GEOLOGIC/HYDROGEOLOGIC SETTING 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 nearly flat- lying alluvial plain,extending from the Tehachapi Mountains in the south to the KIamath Mountains in the north The western and eastern boundaries of this province are the California Coast Range and the Sierra Nevada, respectively Rocks composing the basement complex of the province have not lie been completely defined but are believed to be of metamorphic and igneous origins The northern and southern portions of the Great Valley Province have been designated the Sacramento and San Joaquin Valleys, respectively 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 the Moklumne River approximately one-half mile north of the subject property The estimated depth to ground water at the property is approximately 30 to 35 feet below surface grade (bsg), based on the map titled Lines of Equal Depth to Groundwater Sprang 1996 published I by the San Joaquin County Flood Control District and Water Conservation District(FCD&WCD) The map titled Lanes of Equal Elevation of Groundwater Sprang 1996, also published by the FCD&WCD, shows the property to be in an area where ground water flows toward the south and southwest,but this may be modified by changing recharge and discharge patterns Ground water is considered to be ofbeneficial use and is used for domestic,industrial and commercial purposes The inferred ground water flow direction at the near-by site is toward the southwest UNDERGROUND STORAGE TANK REMOVAL IOn 05 January 1999, one 12,000-gallon fuel UST and two 10,000-gallon fuel USTs,were removed from the southeast end of the site The approximate locations of the former USTs are shown on Advanced GeoEnvironmental,Inc I