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.A;xi _`''a'•.- =ate "' -,sem: <br /> i <br /> 4� <br /> pit. Staining was noted near the fill end of Tank 3 (the diesel fuel tank)and in the product line <br /> trenches. A product sheen was also noted in the groundwater visible in the bottom of tank pit <br /> I (TPI). <br /> ra After the removal of the USTs, RESNA collected a total of eleven soil samples. Analysis of <br /> soil samples collected after tank removal indicated groundwater and soil petroleum hydrocarbon <br /> w impact. Petreleurn hydrocarbons as benzene, toluene, ethylbenzene and xylenes (BTEX) and <br /> total petroleum hydrocarbons as gasoline and diesel(TPHGID)were detected in concentrations <br /> t above method reporting limits in the gasolinefdiesel tank pit(TPl)and in product line samples. <br /> Metals,BTEX and TPHD constituents were detected above method reporting limits in the waste <br /> r=� p'tank <br /> oil it <br /> ('I'P2). Lead was detected in selected samples in tank pit l (TPI)and product line <br /> samples but was not detected in the groundwater in concentrations above State Maximum <br /> "a Coptaminant Levels (MCLS) for drinking water. <br /> tr - <br /> # µ Elevated levels of BTEX, TPHG,and TPHD were recorded in the groundwater sample collected <br /> from the bottom of tank pit I (RETPI-B-9.5'). Total lead (TL) was not detected above State <br /> Maximum Contamination Levels (MCL's) for drinking water. Table 1 summarizes analysis of <br /> soil samples. Analytical results for the water samples are included in Table 3. Based on this <br /> evidence an assessment of the extent of soil and groundwater contamination was indicated. <br /> a 3.4 HYDROLOGY/GEOLOGY <br /> The site is located on level terrain underlain by flood plain deposits of Pleistocene and Holoceae <br /> s age that are composed of sediments similar to and probably conformable on underlying deposits <br /> of alluvium and Tulare formation. The flood plain deposits are light to dark brown and grey <br /> clay, silty sand,and organic materials with locally high concentrations of salt and alkali. Stream <br /> r _ <br /> channel deposits of sand and gravel are also included. <br /> --- <br /> ----------- <br /> ——- i- ---Groundwat it within this zone occurs-less char,ten-feet below grade over most oVthe`Tracy area. <br /> 1' Regional groundwater gradient is to the north The flood plain deposits of the shallow water <br /> A 0[2792.LP <br /> L€ , <br /> - <br /> - ,fir <br />