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' Site Background Information • FAST AND EASY MART ' 244 West Harding Way, Stockton, California ' The site is bordered on the north by Harding Way,with residential properties on the south and west and commercial properties on the cast. A single structure, utilized as a gasoline station and mini- mart, occupies the southern portion of the site. Two underground storage tanks (USTs) were ' removed from the site in September 1998 by Stockton Service Station Equipment(SSSE)and a new UST system was installed in December 1998. 1 REGIONAL GEOLOGIC/HYDROGEOLOGIC CONDITIONS ' The site is situated within the Great Valley Geomorphic Province of California, a large, elongate, northwest-trending, 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 extending 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 SierraNevada,respectively.Rocks composing the basement complex of the province have not been completely defined but are believed to he of metamorphic and igneous origins. The Great Valley Province has been subdivided into two major divisions,designated the Sacramento 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. The closest surface water feature at the site is Smith Canal and Yosemite Lake,located approximately 1,500 feet ' northwest of the site. Water from Smith Canal drains into the San Joaquin River Deep Water Channel and is primarily used for commercial and recreational boating. ' PREVIOUS INVESTIGATIONS ' It is the understanding of AGE that environmental site assessment was performed on the property in early 1996.Field observations indicated that petroleum hydrocarbons may have impacted the soil. One soil sample,collected from 40 feet below surface grade(bsg),had detectable concentrations of ' petroleum hydrocarbons. Two ground water samples had low concentrations of volatile aromatic compounds; one of the ground water samples collected and analyzed contained total petroleum ' hydrocarbons quantified as gasoline(TPH-g)at a concentration of 280 micrograms per liter(µg11). Methyl tertiary-butyl ether (MTBE) was detected at 3.7 µg/l. ' Advanced Geo$nvironmenW,Inc. 1