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I Site Background Information • FERNANDO'S PLACE I1201 South Center Street, Stockton, California ' INTRODUCTION ' The site is located at the intersection of Jackson Street,French Camp Road,and South Center Street in Stockton, California(Figure 2), and is the location of a former gasoline service station The site is currently occupied by several buildings,including a small-engine repair facility and a single-story, multi-family residence ' REGIONAL GEOLOGIC/HYDROGEOLOGIC SETTING According to the Geologic Map of California, published in 1977 by the State of California ' Department of Mines and Geology, the site area is located within the Great Valley Geomorphic Province of California,a large,elongate,northwest trending,asymmetric structural trough The Great Valley Province has been filled to its present elevation with thick sequences of sediment ranging in ' age from Jurassic to Recent, creating a nearly flat lying alluvial plain that extends 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 • Mountains, respectively The province is subdivided into two mayor divisions, designated the Sacramento and San Joaquin Valleys IBased on the 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 within the Jacktone-Hallenbeck-Stockton (JHS) association The JHS soils are located within basins, and generally consist of moderately-to poorly-drained,fine-textured soils The soils are generally derived from both marine and non-marine origins,and are generally formed in alluvium derived from mixed ' rock sources IPREVIOUS SITE ASSESSMENT According to Work Plan-Phase 2 Site Investigation, 1201 S Center Street, Stockton, CA, dated 28 ' May 1999 and prepared by Foothill Engineering(FE),two 500 gallon and one 8,500 gallon gasoline underground storage tanks(UST 1,UST 2,and UST 3,respectively)were removed from the site by Jim Thorpe Oil on 26 October 1994 Ten soil samples were analyzed from the excavation soil ' stockpile, the UST excavations, and the product piping by GeoAnalytical Labs Each sample contained detectable concentrations of petroleum hydrocarbon contamination FE reported that the highest concentrations were located near the west end of UST 3 (Figure 2) The excavation was backfilled to surface grade following sample collection • On 28 April 1998, soil boring PB 1 was advanced near UST 1 and UST 2 to a depth of 30 feet below Advanced GeoEnvironmental,Inc