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' Historical Background <br /> CHET'S AUTOMOTIVE <br /> ' 545 East Miner Avenue, Stockton, California <br /> SITE DESCRIPTION <br /> ' The site is bounded on the south by Miner Avenue Residential pi operty hes west and north of the <br /> site, commercial pi operty lies northeast of the site A single structure occupies the northern portion <br /> of the site <br /> SITE HYDROGEOLOGIC CONDITIONS <br /> ' The closest surface water feature to the site is the San Joaquin located approximately 750 feet west <br /> of the site and is pnmai ily used for commercial and recreational boating Based upon well information <br /> obtained from nearby sites, ground water flow direction is northerly and is currently estimated to <br /> occur at a depth of approximately 45 feet below surface grade (bsg) <br /> I <br /> ' REGIONAL GEOLOGIC CONDITIONS <br /> The site is situated within the Great Valley Geomorphic Province of California, a large, elongate <br /> northwest tending,asymmetric structui al trough The Great Valley Province has been filled with thick <br /> sequences of sediment ranging in age from Jurassic to Recent, creating a nearly flat lying alluvial <br /> ' plain, which extends from the Tehachapi Mountains m 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 /> Range and the Siena Nevada,respectively Rocks composing the basement complex of the province <br /> ' have not been completely defined but are believed to be of metamorphic and igneous origin The <br /> Great Valley Pi ovince has been subdivided into two major divisions identified as the Sacramento and <br /> San Joaquin Valleys <br /> The Modesto, Riverbank and Turlock Lake Formations and overlying Recent alluvium are the <br /> principal sources of domestic ground watei in the 13,500-square mule San Joaquin Valley Ground <br /> Water Basin (Basin 5-22) This basin is drained primarily by the San Joaquin River <br /> ' UNDERGROUND STORAGE TANK REMOVAL <br /> Three gasoline USTs opei ated at 545 East Miner Avenue,Stockton,California(the site)until the late <br /> ' 1970's These UST were then used to collected and iecycle/transport waste oil from the public A <br /> UST excavation and removal was attempted on 16 August 2000 The UST failed during the removal <br /> ' and waste oil was released, approximately 120-gallons of waste fluids <br /> • To nutigate an unauthorized release of petroleum hydrocarbons from the current UST excavation <br /> floor, the scope of work includes the excavation of a limited volume of hydrocarbon-uripacted soil <br />