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1 <br /> ' TABLE 2 <br /> RELATIVE GROUNDWATER ELEVATIONS* <br /> Ripon Farm Service <br /> ' 22871 South Highway 99, Ripon, California <br /> Relative Groundwater <br /> Depth to Groundwater Elevation <br /> ' Well Relative <br /> No Casmg 9-29-94 10-20-44 11-14-94 9-24-94 10-20-94 11-14-94 <br /> Elevation <br /> MW-1 99 03 20 55 2047 2072 78 48 78 55 78 31 <br /> MW-2 9931 2086 2076 2101 7845 7856 7131 <br /> ' MW-3 9855 2004 1995 2022 78 S 1 7860 78 33 <br /> ' euurementa w rcc, <br /> 4.0 FINDINGS <br /> t4.1 Groundwater Elevation and Gradient <br /> The elevation of groundwater in each well was calculated by subtracting the groundwater <br /> ' depth from the surveyed casing elevation (Table 2) The average depth to gi oundwater at <br /> the site in September, October and November 1994 was 20 48 feet, 20 39 feet, and 20 65 <br /> feet, respectively This represents approximately a one-half foot drop in elevation drop in <br /> groundwater from August to November 1994 This is consistent with seasonal (summer to <br /> fall) change in groundwater <br /> ' The groundwater gradient and flow direction for September, October and November were <br /> calculated to be 0 0005 ft/ft directed N 58° W (Figure 3), 0 0036 ft/ft directed S 79° W <br /> (Figure 4), and 0 0004 ft/ft directed N 79° W (Figure 5), respectively <br /> 4.2 Petroleum Hydrocarbon Impacted Groundwater <br /> 1 Petroleum hydrocarbons and purgeable aromatics were detected in samples from each well <br /> TPH as gasoline was detected in MW-1, MW-2 and MW-3 at concentrations of 570 µg/L <br /> ' (ppb), 2300 ppb and 1900 ppb, respectively TPH as diesel was detected in MW-1, MW-2 <br /> and MW-3 at concentrations of 320 ppb, 6000 ppb and 460 ppb, respectively <br /> ' Benzene, toluene and xylenes were detected in MW-1 at concentrations of 0 7 ppb, 0 3 ppb <br /> 1 1 ppb, respectively Benzene, toluene, ethylbenzene and xylenes were detected in MW-2 <br /> at concentrations of 780 ppb, 97 ppb, 320 ppb and 350 ppb, respectively Benzene, toluene <br /> ' and xylenes were detected in MW-3 at concentrations of 0 6 ppb, 0 3 ppb and 2 9 ppb, <br /> respectively The analytical results of the groundwater samples are summarized in Table 3 <br /> The laboratory report and chain-of-custody are included in Appendix B <br /> %p"p.—S.�QPMa awes s <br /> 1 <br /> 1 <br />