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1 ' Site Background Information ERNIE'S GENERAL STORE ' 4407 East Waterloo Road, Stockton, California ' The site, located at 4407 East Waterloo Road in Stockton, California (Figuic 1), 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 underground storage tanks(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 of premium ' unleaded fuel, and one 15,000-gallon UST containing regular unleaded fuel IREGIONAL GEOLOGIC/IIYDROGEOLOGIC SETTING The property is situated within the Great Valley Geomorphic Province of California, a large, I 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 that extends from the Tehachapi Mountains in the south to the Klammath ' Mountains in the north The California Coast Range and the Sierra Nevada form the western and eastern boundaries of this province Rocks composing the basement complex of the province have not been completely defined but are believed to be of metamorphic and igneous origin The northern lieand 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 I 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 Mokolumne River approximately one-haif mile north of the subject property IThe estimated depth to groundwater at the property is 30 to 35 feet below surface grade(bsg),based on the map entitled Lines ofEqual Depth to Groundwater Sprang 1996 published by the San Joaquin County Flood Control District and Water Conservation District (FCD&WCD) The map entitled Lines 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 seasonally and locally variable recharge and discharge patterns The inferred ground water flow direction at the site is toward the southwest UNDERGROUND STORAGE TANK REMOVAL IleOn 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 Figure 2 Advanced CcoEnvFronmental,Inc I