Laserfiche WebLink
r <br /> Pit Staining was noted near the fill end of Tank 3 (the diesel fuel tank) and in the product lune <br /> trenches A product sheen was also noted in the groundwater visible in the bottom of tank pit <br /> 1 UP1). <br /> 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 /> impact. Petroleum hydrocarbons as benzene, toluene, ethylbenzene and xylenes (BTEX) and <br /> total petroleum hydrocarbons as gasoline and diesel (TPHG/D) were detected in concentrations <br /> ' above method reporting limits in the gasolene/diesel tank pit (TPI) and in product line samples. <br /> Metals, BTEX and TPHD constituents were detected above method reporting limits in the waste <br /> ' oil tank pit (TP2) Lead was detected in selected samples in tank pit 1 (TPI) and product line <br /> samples but was not detected in the groundwater in concentrations above State Maximum <br /> Contaminant Levels (MCLS) for dnnking water. <br /> Elevated levels of BTEX, TPHG, and TPHD were recorded in the groundwater sample collected <br /> from the bottom of tank pit 1 (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 /> 3.0 HYDROLOGY/GEOLOGY <br /> The site is located on level terrain underlain by flood plain deposits of Pleistocene and Holocene <br /> ' 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 /> rclay, silty sand, and organic matenals with locally high concentrations of salt and alkali. Stream <br /> ' channel deposits of sand and gravel are also included <br /> Groundwater within this zone occurs less than ten feet below grade over most of the Tracy area <br /> Regional groundwater gradient is to the north The flood plain deposits of the shallow water <br /> R-012792 LF 2 <br /> 1 <br />