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s <br /> i26 April 2000 <br /> AGE-NC Project No 99-0520 <br /> iPage 2 of 8 <br /> i feet bsg According to a PHS-EHD inspection report petroleum hydrocarbon odor and soil <br /> discoloration were noted beneath USTs <br /> iHydrocarbon Impacted Soil <br /> i TPH-g was detected at the south end of the former UST 0 at a concentration of 4 milligrams per <br /> kilogram (mg/kg) Volatile aromatic compounds (benzene, ethylbenzene, toluene and total xylenes) <br /> were detected In the soil samples collected from the south end of the former USTs #2 and #3 at <br /> i concentrations up to 180 micrograms per kilogram (,ug/kg) BTEX compounds were also detected <br /> In the dispenser samples at concentrations up to 62 ,ug/kg <br /> i Total petroleum'hydrocarbons quantified as gasoline (TPH-g)were not detected in the soil samples <br /> collected from the dispensers Total petroleum hydrocarbons quantified as diesel (TPH-d) were not <br /> detected In any of the UST excavation floor samples, the dispenser soil samples, or in the water <br /> isample collected from the site ' <br /> Methyl tertiary butyl ether(MTBE)was detected in five of the UST floor and dispenser soil samples <br /> i• at concentrations up to 320,ug/kg <br /> i Stockpile soil from the UST removal had detectable concentrations of TPH-g, TPH-d and BTEX, <br /> as well as MTBE and tertiary-butanol (TBA) The greatest concentration of TPH-g was 120 mg/kg <br /> and the greatest concentration of TPH-d was 790 mg/kg BTEX compounds were detected at <br /> i concentrations as high as 6,800,ug/kg (xylene) MTBE and TBA were detected in the stock pile at <br /> concentrations up to 500 ,ug/kg and 970 ,ug/kg, respectively <br /> i' Dissolved Petroleum Hydrocarbons <br /> TPH-g was detected In the grab ground water sample at a concentration of 37 milligram per liter <br /> i (mg/1) MTBE was also detected in the grab ground water sample at a concentration of 3,200 <br /> micrograms per liter (µg/1) <br /> 23 REGIONAL GEOLOGIC/HYDROGEOLOGIC SETTING <br /> iBased on Geologic Map of California, published in 1977 by the State of California Department of <br /> Mines and Geology, the site Is located within the Great Valley of California, a large, elongate <br /> northwest trending, asymmetric structural trough The Great Valley Province has been filled to Its <br /> ipresent elevation with thick sequences of sediment ranging in age from Jurassic to Recent, creating <br /> a nearly flat-lying alluvial plain, extending from the Tehachapi Mountains In the south to the <br /> iAdvanced GeoEnvironmental,Inc. <br /> i <br />