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I 3 5 ppm, 24 ppm and 0 13 ppm respectively No petroleum hydrocarbons were detected at a depth of 10 feet in boring B-7 ' Strong sewage odors were noted in the entire depth of boring B-8 Strong sewage odors were detected in boring B-9 near the surface and decreased downward Organic vapors were detected at concentrations up to 141 ppm in samples from B-9 TPH as gasoline and diesel were detected in boring B-9 at a depth of 10 feet at concentrations of 40 ppm and 26 ppm, respectively TPH as gasoline was detected at a depth of 15 feet at a concentration of 0 56 ' ppm The analytical results are summarized on Table 2 The laboratory report and chain-of- custody are included in Appendix B ' TABLE 2 ANALYTICAL RESULTS of SOIL SAMPLES Grant Line Gas & Food ' 2420 Grant oad mg/kg ' Sample TPH as TPH as TPH as Benzene Toluene Ethyl- Xylenes ID gasoline diesel motor benzene oil B6-5 ND 36 290 ND ND ND ND 136-13 ND ND ND 00051 ND ND ND 136-15 ND 40 ND 00096 ND ND ND 137-5 2 0 35 24 013 ND ND ND ,b 137-10 ND ND ND ND ND ND ND ' 139-10 40 26 ND ND 010 013 019 139-15 056 ND ND ND ND j ND ND ' mg/kg = pasta p.r nuWon.ppnl ND = not detected ' 4.3 Relative Groundwater Elevation and Gradient The relative elevation of groundwater in each well was calculated by subtracting the depth- to-water from the surveyed relative casing elevation (Table 1) All wells were surveyed ' relative to MW-1 The relative groundwater elevation ranges from 1156 feet in MW-3 to 1112 feet in MW-4 Groundwater elevation has decreased an average of 0 72 feet at the site ' since the April 1994 monitoring The groundwater gradient was calculated to be 0 0037 ft/ft duected N 27° E (Figure 3) However, the gradient becomes more flat near the north end of the site The gradient is I SC-94 01 10Ma .-t[...G..&P-od QR VIZ 94