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I <br /> . 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 property lies west and north of the <br /> site,commercial property is located to the northeast A single structure occupies the northern portion <br /> of the site <br /> 1 <br /> SITE HYDROGEOLOGIC CONDITIONS <br /> ' The closest surface water feature to the site is the San Joaquin River,located approximately 750 feet <br /> west of the site and used primarily 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 /> '• 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 /> ' thick 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 California <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 major 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 underground storage tanks (USTs) operated at 545 East Miner Avenue, Stockton, <br /> California(the site)until the late 1970s These USTs were used to collect and recycle transport waste <br /> ' oil for the public A UST excavation and removal was attempted on 16 August 2000 The UST failed <br /> during the removal and approximately 120-gallons of waste oil was released <br /> i <br /> i <br /> Advanced GeoEnvironmental,Inc <br />