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AC <br /> 15 Jurie 1999. <br /> AGE-NC-Project No..98-0534 - <br /> Page_3 of 13 <br /> TPH-d;TPH-g,BTEX and the fuel additives:DIPE,ETBE,MTBE;TA.Wl TBA.The water,samples <br /> from Tanks:2 and 5 were for:TP,H-g,•BTEX compounds,and the fuel additives DIPS,.; <br /> ETBE, MTBE, TAME;TBA. _ <br /> TPH=d,TPH-g, BTEX.'and-fut l'additives were detected in th&: 6il_samples collected from the UST �T <br /> J. excavations. TPH-g-and-BTEX,were detected in four of the`seventeen soil samples and;TPH-d was : r <br /> detected in one of the seventeen soil samples:analyzed from the-UST-area. ' <br /> TPH=d was detected at low concentrations-in.the former dispenser area,and'in the mid-product line"-',f. , <br /> trench. TPH-g.and BTEX_was also detected"in themidportion oftlie product line trench. TPH-g and <br /> TPH=d were detected in-_16 stockpile soil samples. BTEX:compounds were detected;in eleven <br /> stockpile soil samples analyzed •: <br /> - v <br /> Groundwater samples'analyzed"were :ir- pacted with TPH-g and TPH-d at concentikions up to <br /> 77,000-micrograms per liter(Eeg/L) and 70,000;ug/L,.as well_as BTEX compounds"at,concentration ; <br /> up to 7,890 µg/L of benzene. MTBE was detected ata maximum concentration of 3.;100 ug/L by <br /> EPA method 8020. A-summary of an�ytical results`of water samples are presented in Tables 3 and . <br /> 2.3: REGIONAL GEOLOGIC/HYDROGEOLOGIC-SETTING <br /> The site is located within the northern San aquin Valley which comprises part of the Great Valley } <br /> geomorphic provirice of •California:.The San Joaquin Valley is formed by the.Great.Valley. . .v <br /> geosyncline;which is a-large,elongate, northwest-trending.asymmetrical structural trough (basin) '_._ <br /> „h it is bordered by the Coast°Ranges to the.,west, the Klamath-Mountain's and Cascade Range to the „- k <br /> nortli,,and-the Sierra Nevada to the east.'This trough has been..filled' with sediments derived.from. s <br /> both marine and continental sources. Thickness of the sedimentary hill ranges from'.thin veneer's <br /> along the valley edges:.to_.greater than 20,000 feet in the south-central portion.of the valley. The <br /> sedimentary formations range in age with the older deposits being primarily marine`in`.originand the.-;; _ - <br /> younger_deposits being Yprimarily. ;continental. Continental=derived sed <br /> iments}were primarily <br /> deposited-in lacustrine; fluvial, and alluvial environments with sources.being the'mountain ranges ... - <br /> surrounding the valley-(Olmsted and Davis :1-961):'The.site is located on unconsolidated and semi �_k = , <br /> consolidated alluvium,.lake,playa andaerrace deposits of Quaternary age (Califol iia'Diyision of'- <br /> Mines and Geology, 1977). <br /> The Modesto, Riverbank and Turlock Lake'Formations an&6verlying�Recenilidl'vitim are-the <br /> principal sources of domestic ground water in the 13,500-square rriile Sari Joaquin Va11ey Ground ; - ' <br /> zlt <br /> r <br /> Water.Basin (Basin 5-22) <br /> - J - - Advanced GeoEnvironmenlal,Inc. <br /> y_ -- - c, <br /> r rg r' s rr y i <br />