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Zia <br /> I <br /> s The dissolved-phase hydrocarbon constituents in the <br /> ground water onsite are limited to thhernorthwest <br /> corner and the north end of the property, <br /> downgradient of the former underground tank area. <br /> ® No fecal coliform was detected above reported <br /> detection limits in any d of the monitoriugh n$} wells <br /> tested (AW-1, AW-3, an <br /> ® No TPH-G, TPH-D, or BTEX constituents were detected <br /> above reported detection limits in the ground water <br /> samples from Monitoring Wells AW-1, AW--2, and AW-4 <br /> ' I through AW-8• <br /> o TPH-G, ethylbenzene, and total xylenes were detected <br /> only in the ground water samples fro� Monit3ring <br /> Well AW-3 at concentrations ranging from <br /> to <br /> 210 ppb. <br /> • The highest concentrations -f TPH-G, TPH-•D, and BTEX <br /> constituents were detected in the ground water <br /> samples collected from B-6 and B-7, g <br /> the <br /> qualitative ground water survey. 3-6 and B-7 <br /> are located onsite and downgradient of the former <br /> 1-ank area. <br /> m TPH-D and total xylenes were detected only in the <br /> soil samples collected from Soil Boring B-2 at <br /> concentrations up tr- 180 ppm. <br /> ® The general ground water flow dire on is to the <br /> at the site <br /> calculated during this investigation is <br /> northeast, with an average hydraulic gradient of <br /> 0.014 foot per foot. <br /> o The predominant soil types at the site are <br /> clay/silt/sand mixtures, with occasional. gravelly <br /> lenses to 14 feet below grade and sand generally <br /> I> overlying silty clay that was encountered at <br /> approximately 19 feet below grade. <br /> 4.0 PROPOSED SCOPE OF WORK <br /> The proposed Supplemental Site Investigation will be <br /> I conducted in accordance with applicable regulationanscope <br /> guidelines of the SJCEH5 and the RWQCB. P P se <br /> t of work, as outlined in Alton Geoscience letter dated <br /> November 26, 1991, will be conducted as follows: <br /> I; <br /> 3 <br /> I <br /> Is <br />