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TABLE 5 <br /> Groundwater Elevation measurements - September 23, 1999 in Feet <br /> Well ID Well Elevation Depth to water Groundwater <br /> Elevation <br /> MW-1 28 . 25 60 . 44 -32 . 19 <br /> MW-2 28.54 60 . 63 -32 . 09 <br /> MW-3 28 . 49 60. 56 -32.07 <br /> The calculated gradient is S 42 E or 1320 at 0 .002 ft/ft. Figure <br /> 3 depicts the calculated gradient. <br /> ADDITIONAL FIELD WORK <br /> On October 8, 1999 SOILS EXPLORATION SERVICES INC. , the driller <br /> for the borings and well construction was on site and added grout <br /> to bring the well grout to approximately 8 inches below grade. <br /> This visit on site was coordinated with SJCEHD. <br /> SUMMARY, CONCLUSIONS AND RECOMMENDATIONS <br /> The calculated gradient is S 421 E or 132° at 0 . 002 ft/ft. <br /> Based on the gradient determination, it appears that <br /> contamination from an off site source may be affecting this site. <br /> The soil above 20 feet had background levels of hydrocarbon <br /> vapors. <br /> The analysis of the soil samples obtained from all the wells <br /> below 20 feet had detectable concentrations of TPHG, MTBE and <br /> BTEX. <br /> No detectable concentrations of TPHD was found in the soil <br /> collected from MW-2. <br /> The concentrations of TPHG, TPHD and BTEX in the groundwater <br /> samples from the three wells are actionable levels . However, <br /> the results obtained in the first sampling of newly constructed <br /> wells may not be representative. JPCA recommends that <br /> approximately three months to four months or about the middle of <br /> January 2000, the wells be purged and pumped to remove three well <br /> 10 <br />