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• Site Background Information HERMAN AND HELEN'S MARINA 15135 Eight Mile Road, Stockton, California The property is currently occupied by Herman and Helen's Manna, which consists of multiple floating structures on the Little Connection Slough as well as a couple surface buildings and a large asphalt parking lot Currently, two 12,000-gallon above ground storage tanks are in use at the site One tank contains gasoline, the second is compartmentalized into one 5,000-gallon gasoline tank, one 3,000-gallon gasoline tank,one 3,000-gallon diesel tank and one 1,000-gallon oil tank The tanks are connected to dispensers by piping contained in a concrete-lined trench REGIONAL GEOLOGIC/HYDROGEOLOGIC SETTING The property is situated within the Great Valley Gcomorphic 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 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 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 Little Connection Slough immediately west of the subject property Ground water is considered to be of beneficial use and is used for domestic, industrial and commercial purposes UNDERGROUND STORAGE TANK REMOVAL On 30 October 1991,three underground storage tanks(USTs)were removed from the site by Warren E Gomes Excavating,Inc Although no groundwater was encountered,the bottom of the tanks were rusted Total petroleum hydrocarbons quantified as gasoline and diesel (TPH-g and TPH-d) and benzene, toluene, ethylbenzene and total xylenes (BTEX) were detected in soil samples collected from the UST excavation at depths between 9 feet and 12 feet below surface grade (bsg), at maximum concentrations of 4,800 milligrams/kilogram (mg/kg) TPH-g, 37 mg/kg benzene, 93 mg/kg ethylbenzene and 500 mg/kg xylenes in sample TK2-N and 350 mg/kg toluene in TNI-N Lead was detected in samples TN1-S and TN2-N and the soil pile at 7 mg/kg, 10 mg/kg and 11 • Advanced Geo Environmental,Inc