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1 ' Site Background Information CHARLIE'S DAY AND NITE 706 North El Dorado Street, Stockton, California ' The site is located on the northeast corner of North El Dorado Street and East Park Street in downtown Stockton, San Joaquin County California One residence was located at the site in 1895, ' several residences were located at the site in 1917, based upon Sanborn Maps Operation of a gasoline service station began at the site between 1937 and 1950, based upon aerial photographs and Sanborn Maps The surrounding area is currently commercial and residential 1 2 1 REGIONAL GEOLOGIC/HYDROGEOLOGIC SETTING ' The site is situated within the southern portion of the Great Valley Geomorphic Province of California., a large, elongate, northwest trending, asymmetric structural trough, the northern and ' southern portions of the Province have been designated the Sacramento and San Joaquin Valleys, respectively The Province is bordered by the Coast Ranges to the west,the Klamath Mountains and Cascade Range to the north, and the Sierra Nevada to the east ' The Great Valley has been filled with sediments derived from both marine and continental sources Thickness of the sedimentary fill ranges from thin veneers along the valley edges to more than 20,000 feet in the south central portion of the valley The sedimentary formations range in age from Jurassic to Recent, with the older deposits being primarily marine in origin and the younger deposits being primanly continental Continental-derived sediments were primarily deposited in lacustrme, fluvial, and alluvial environments with sediment sources being the mountain ranges surrounding the valley(Ohnsted and Davis, 1961), the site itself is located on unconsolidated and semi-consolidated ' alluvium, lake, playa and terrace deposits of Quaternary age (California Division of Mines and Geology, 1977) Rocks composing the basement complex of the Province have not been completely defined but are believed to be metamorphic and igneous in origin ' Soil-boring data indicate that fine-grained clayey silt and silty clay are the dominant soil types encountered at the site Above 55 feet bsg the soil appears to be a more oxidized, brownish color, ' below 55 feet bsg the soil color tends to be olive gray or green Sand layers tend to be thin and laterally discontinuous, except for an approximately 20-foot sand localized along the western edge of the site and an approximately 2-foot sand zone, at about 15 feet bsg, covering the northeastern ' half of the site Saturated soil was first encountered in most borings at 25 feet bsg 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) The estimated depth to ground water at the site is approximately 20 to 24 feet below surface grade (bsg) based on ground water monitoring data at the site since October ' 1999, ground water gradient determinations have indicated a consistently northeast ground-water flow