Laserfiche WebLink
1 <br /> SHistorical Background <br /> DEN'S AUTO REPAIR <br /> 308 South El Dorado Street, Stockton, California <br /> The site is located at 308 South El Dorado Street in Stockton, California m an conunercial/mdustnal <br /> area of south Stockton at the southeast corner of the intersection of South El Dorado Street and East <br />' Lafayette Street A single structure is located on the property and is currently occupied by an auto <br /> repair facility(Figure 2) <br /> REGIONAL GEOLOGIC/HYDROGEOLOGIC SETTING <br />' The site is located in an area of low topographic relief According to Geologic Map of California, <br /> published in 1966 by the California Department of Conservation Division of Mines and Geology, the <br /> site area is shown to be within the Great Valley Geomorphic Province (GVGP) of California, a large, <br /> elongate, northwest trendmg structural trough The GVGP is subdivided into two major divisions <br /> designated the Sacramento and San Joaquin Valleys, which have been filled to the present elevation <br /> t with thick sequences of sediment ranging in age from Jurassic to Recent, creating a nearly flat-lying <br /> alluvial plain extending from the Tehachapi Mountains in the south to the Klamath Mountains in the <br /> north The western and eastern boundaries of this province are comprised of the California Coast <br /> 10 Range and the Sierra Nevada, respectively <br /> Based on data collected from the site m February 2002 the average depth to groundwater at the site <br /> is approximately 25 feet below surface grade (bsg) The ground water in February 2002 was mferred <br /> to be flowing toward the north-northeast under a gradient of 0 008 ft/ft <br />' UNDERGROUND STORAGE TANK REMOVAL <br /> I On 25 and 26 May 1995, four USTs and associated piping were removed from the site by Valley <br /> Environmental Solutions(VES)of Stockton,California One 8,000-gallon regular gasoline UST,one <br /> 7,000-gallon gasoline UST and one 5,000-gallon gasoline UST were removed froma large excavation <br /> Ilocated on north of the building, a single 500-gallon waste oil UST was removed from an excavation <br /> located on the south side of the building (Figure 2) <br /> Upon removal of the USTs, soil samples were collected from beneath each UST, piping areas and <br /> excavated soil Total petroleum hydrocarbons quantified as gasoline(TPH-g) were detected in the <br /> soil samples at concentrations up to 9,100 part per milhon (ppm) in sample TK3-N, collected from <br /> the northern boundary of the property <br /> Advanced GeoEnvironmental,Inc <br />