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' Ethylbenzene was detected in six(6) of the fourteen (14)samples at concentrations of 0 019 <br /> ppm (B6-15) to 7 4 ppm (B4-20) Xylenes were detected in eight of the 14 samples ranging <br /> from 0 051 ppm (B8-20) to 8 4 ppm (B4-20) The laboratory report and chain-of-custody are <br /> included in Appendix C. <br /> ' 4.4 Relative Groundwater Elevation and Flow Direction <br /> The average depth to groundwater at the site is 2012 feet bgs The relative groundwater <br /> elevation is highest in MW3 at 78 88 feet The average hydraulic gradient was calculated <br /> to be 0 0006 ft/ft with the flow direction of S 40° W (Figure 3) <br /> ' 4.5 Groundwater Sample Analysis <br /> Petroleum hydrocarbons were detected in each of the three monitoring wells at the site. <br /> ' TPH as gasoline was detected in MW1, MW2 and MW3 at concentrations of 1,700 µg/L <br /> (ppb), 14,000 ppb and 2,600 ppb, respectively TPH as diesel was detected in MW1, MW2 <br /> and MW3 at concentrations of 2,400 ppb, 9,200 ppb and 6,900 ppb, respectively Figure 4 <br /> ' shows TPH as diesel concentrations in groundwater <br /> Benzene and toluene were detected in MW2 at concentrations of 1,200 ppb and 160 ppb, <br /> 1 respectively Ethylbenzene was detected in MW1, MW2 and MW3 at concentrations of 35 <br /> ppb, 380 ppb and 6 3 ppb, xylenes were detected at concentrations of 36 ppb, 1,300 ppb and <br /> 8 0 ppb The analytical results of the groundwater samples are summarized in Table 4. The <br /> laboratory report and chain-of-custody are summarized in Appendix D <br /> TABLE 4 <br /> ' ANALYTICAL RESULTS OF WATER SAMPLES <br /> Ripon Farm Service <br /> AWL <br /> Sample ID TPH as TPH as Benzene Toluene Ethyl Xylenes <br /> Gasoline Diesel benzene <br /> ' 1 MW 115-6-94 1,700 2,400 ND ND 35 36 <br /> MW2/5-6-94 14,000 9,200 1,200 160 380 1,300 <br /> ' MW3/5-6-94 2,600 6,900 ND ND 63 8 <br /> ASIL =paw per b9hon.pp <br /> ' ND =not detected <br /> Q..I.�A.W S-'-"'I.. ^ <br /> nyw Rim Seines QPV,9% 7 5 Oji <br />