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1 Site Background Information Flame Mmi-Mart <br /> Page 4 of 4 <br /> performed at the site to monitor dissolved petroleum hydrocarbon concentrations In ground water <br />' and to characterize ground water flow direction and gradient on the site Generally, TPH-g was <br /> detected in water samples collected from wells MW-1,MW-2,MW-3 and MW-5 at concentrations <br /> as high as 180,000 µg/1 (MW-2), various BTEX constituents were generally detected from well <br />' MW-2 at concentrations as high as 1,000 gg/1 benzene, 100 µg/1 toluene, 58 µg/1 ethylbenzene and <br /> 1,700µg/1 ethylbenzene, MTBE and TAME were generally detected from wells MW-2 and MW-3 <br /> at concentrations as high as 180,000 gg/l and 600 µg11, respectively <br />' Based on the current area bound by wells MW-1 through MW-8, the lateral extent of the dissolved <br /> petroleum hydrocarbon plume is not known toward the west, southwest and south The vertical <br />' extent is marginally defined in the area of monitoring well MW-2 <br />' REGIONAL GEOLOGIC SETTING <br />' According to a Geologic Map of California, published in 1966 by the California Department of <br /> Conservation Division of Mines and Geology,the site area is within the Great Valley Geomorphic <br /> Province(GVGP)of California, a large, elongate,northwest trending structural trough The GVGP <br />' is subdivided into two mayor divisions designated the Sacramento and San Joaquin Valleys,which <br /> have been filled to the present elevation with thick sequences of sediment ranging in age from <br /> Jurassic to present day, creating a nearly flat lying alluvial plain extending from the Tehachapi <br />' Mountains in the south to the Klamath Mountains in the north The western and eastern boundaries <br /> of this province are comprised of the California Coast Range and the Sierra Nevada Mountains, <br /> respectively <br /> Based on a General Soil Map from the San Joaquin County Soil Survey, published by the United <br /> States Department of Agriculture Soil Conservation Service in 1992, the site area is described as <br /> I being within the Tokay-Acampo(TA)association The TA soils are located within low fan terraces <br /> along the Mokelumne River, and generally consist of moderate well drained, moderate coarse <br /> textured soils that are deep to a cemented hardpan The TA soils generally formed in alluvium <br /> derived from granitic rock sources <br /> I <br /> Advanced GeoEnvironmental,Inc <br />