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1 <br />' Site Background Information <br /> GUARDING AND CRAWFORD <br />' 517 West Fremont Street, Stockton, California <br />' The site is located on Fremont Street in an area of low topographic relief in west Stockton, <br /> California, south of the site is the Stockton Deep Water Channel Local land use in the vicinity of <br />' the site is industrial and commercial, with residential areas located adjacent to the site <br /> REGIONAL GEOLOGIC/=ROGEOLOGIC SETTING <br /> The site is situated within the southern portion of the Great Valley Geomorphic Province of <br /> California, a large, elongate, northwest trending, asymmetric structural trough, the northern and <br /> southern portions of the Province have been designated the Sacramento and San Joaquin Valleys, <br /> respectively The Province is bordered by the Coast Ranges to the west,the Klamath Mountains and <br /> Cascade Range to the north, and the Sierra Nevada to the east <br /> The Great Valley has been filled with sediments derived from both marine and continental sources <br /> Thickness of the sedimentary fill ranges from thin veneers along the valley edges to more than <br /> 20,000 feet in the south central portion of the valley The sedimentary formations range in age from <br /> Jurassic to Recent,with the older deposits being primarily marine in origin and the younger deposits <br />' continental Continental-denved sediments were primarily deposited in lacustnne, fluvial, and <br /> alluvial environments with sediment sources being the mountain ranges surrounding the valley <br /> (Olmsted and Davis, 1961), the site itself is located on unconsolidated and semi-consolidated <br /> ' alluvium, lake, playa, and terrace deposits of Quaternary age (California Division of Mines and <br /> Geology, 1977) Rocks composing the basement complex of the Province have not been completely <br /> ' defined but are believed to be metamorphic and igneous in origin <br /> The Modesto, Riverbank, and Turlock Lake Formations and overlying Recent alluvium are the <br /> ' principal sources of domestic ground water in the 13,500-square mile San Joaquin Valley Ground <br /> Water Basin(Basin 5-22) The ground water at the site generally flows in a northwesterly direction <br /> and is found at a depth of 13 feet to 16 feet below surface grade(bsg) The prevailing ground water <br /> ' flow direction in central Stockton is generally toward the northeast,however,localized ground water <br /> flow direction may vary during winter/summer cycles and tidal fluctuations Ground water is <br /> considered to be of beneficial use and is utilized for domestic, industrial, and commercial purposes <br /> UNDERGROUND STORAGE TANK REMOVAL <br /> ' Iii September 1989,one 1,000-gallon underground storage tank(UST), dispenser, and piping were <br /> removed from the site Petroleum hydrocarbons were detected in soil samples collected from the <br /> ' UST excavation and dispenser areas at concentrations as high as 700 parts per million(ppm,reported <br /> • as milligrams per kilograms mg/kg) <br /> ' Advanced GeoEnvironmental,Inc <br /> 1 <br />