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Ile Site Background Information K& S GAS & GROCERY I701 East Charter Way, Stockton, California The site is located in a flat, commercial area of Stockton, Califonua on the northeast corner of Charter Way and Stanislaus Street (Figure 1) The site is presently utilized as a fueling facility and convenience store One 20,000-gallon fuel UST is presently located on the western portion of the property REGIONAL GEOLOGIC SETTING According to a Geologic Map of California, published in 1966 by the California Department of Conservation Division of Mines and Geology, the site area is within the Great Valley Geomorphic Province(GVGP) of California, a large, elongate,northwest trending structural trough The GVGP is subdivided into two mayor divisions designated the Sacramento and San Joaquin Valleys,which have been filled to the present elevation with thick sequences of sediment ranging in age from Jurassic to present day, 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 comprised of the California Coast Range and the Sierra Nevada, respectively • Based on a General Soil Map from the San Joaquin County Soil Survey, published by the United States Department of Agriculture Soil Conservation Service in 1992, the site area is described as within the Jacktone-Hallenbeck-Stockton(JHS)association The JHS soils are located on basin rims and within basins, and generally consist of somewhat poorly drained and moderately well drained, fine-textured soils that are moderately deep and deep to a cemented hardpan The JHS soils generally forined in alluvium from mixed rock sources I UNDERGROUND STORAGE TANK REMOVAL The three underground storage tanks (USTs) were removed from the site on 13 February 1998 I Petroleum hydrocarbons were detected in soil samples collected from below two 12,000-gallon USTs at concentrations as high as 1,400 milligrams per kilogram(mg/kg) Petroleum hydrocarbons were not detected beneath a 1,000-gallon UST PREVIOUS SUBSURFACE INVESTIGATION On 19 June 1997,four soil probe borings(probings)were advanced at the site near the 12,000-gallon USTs Three probings were advanced to a vertical depth of 20 feet below surface grade (bsg), due to the presence of hydrocarbon odor, one probing (B2)was advanced to a vertical depth of 45 feet bsg TPH-g was detected at depths of 30 and 40 feet bsg at concentrations of 460 mg/kg and 1,000 mg/kg,respectively,beneath the south ends of the USTs Petroleum hydrocarbons were not detected IAdvanced GeoEnvironmentai,Inc