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i j Historical Background CHET'S AUTOMOTIVE 545 East Miner Avenue, Stockton, California ' SITE DESCRIPTION ' Chet's Auto is located in a mixed commercial and industrial area of Stockton, California It is bounded on the south by Miner Avenue, with residential property to the west and north of the site and commercial property to the northeast A single stricture occupies the northern portion of the site SITE HYDROGEOLOGIC CONDITIONS The closest surface water feature to the site is McLeod Lake,located approximately 2,100 feet west ' of the site Based upon previous quarterly monitoring events conducted at the site,ground water flow direction is toward the northeast and occurs at depths between approximately 30 feet and 35 feet below surface grade (bsg) REGIONAL GEOLOGIC CONDITIONS • The site is situated within the Great Valley Geomorphic Province of Califorrua, a large, elongate, northwest-tending, asymmetric structural trough The Great Valley Province has been filled with thick sequences of sediment ranging in age from Jurassic to Recent, creating a nearly flat-lying alluvial plain which 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, respectively Rocks composing the basement complex of the province have not been completely defined but are believed to be of metamorphic and igneous origins The Great Valley Province has been subdivided into two mayor divisions identified as the rSacramento and San Joaquin Valleys The Modesto, Riverbank, and Turlock Lake Formations and overlying Recent alluvium are the ' principal sources of domestic ground water in the 13,500-square mile San Joaquin Valley Ground Water Basin(Basin 5-22) This basin is drained primarily by the San Joaquin River UNDERGROUND STORAGE TANK REMOVAL Three gasoline underground storage tanks(USTs),used to collect and recycle waste oil,operated at the site until the late 1970s A UST excavation and removal was attempted on 16 August 2000,but the UST failed dunng the removal and released approximately 120 gallons of waste oil iThe UST pit was over-excavated to mitigate an unauthorized release of petroleum hydrocarbons ' from the UST excavation The soil was excavated, using a backhoe or an excavator, to depths I Advanced GeoEnvironmental,Inc