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i <br /> { <br /> -' Historical Background <br /> • CHET'S AUTOMOTIVE <br /> ' 545 East Miner Avenue, Stockton, California <br /> ' SITE DESCRIPTION <br /> The site is bounded on ttie south b Miner Avenue Residential roe lies west and north o <br /> ' Y property rty f the <br /> site, commercial property 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 primanly used for commercial and recreational boating Based upon well <br /> information obtained from nearby sites, ground water flow direction is northerly and is currently <br /> ' estimated to occur at a depth of approximately 45 feet below surface grade (bsg) <br /> ' REGIONAL GEOLOGIC CONDITIONS <br /> i <br /> The site is situated within the Great Valley Geomorphic Province of California, a large, elongate <br /> ' northwest tending, asymmetric structural trough The Great Valley Province has been filled with <br /> tluck sequences of sediment ranging in age from Jurassic to Recent, creating a nearly flat lying <br /> ' alluvial plain,which extends from the Tehachapi Mountains in the south to the Klamath Mountains <br /> in the north The western and eastern boundaries of this province are comprised of the Californi<, <br /> Coast Range and the Sierra Nevada, respectively Rocks composing the basement complex of the <br /> ' province have not been completely defined but are believed to be of metamorphic and igneous <br /> origin The Great Valley Province has been subdivided into two mayor divisions identified as the <br /> Sacramento and San Joaquin Valleys <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) This basin is drained primarily by the San Joaquin River <br /> ' UNDERGROUND STORAGE TANK REMOVAL <br /> Three gasoline USTs operated at 545 East Miner Avenue, Stockton, California(the site) until the <br /> late 1970's These UST were then used to collected and recycle/transport waste oil from the public <br /> A UST excavation and removal was attempted on 16 August 2000 The UST failed during the <br /> ' removal and waste oil was released, approximately 120-gallons of waste fluids <br /> . To mitigate 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-impacted soil <br />