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31 January 1997 <br /> AGE-NC Protect No 95-0125 <br /> Page 6 of 7 <br /> calculated by subtracting the ground water depth from the surveyed casing elevations which were <br /> surveyed relative to MW-1 having an arbitrary elevation of 100 00 feet Table 1 includes the relative <br /> ground water elevations <br /> Figure 3 - Relative Ground Water Elevation, illustrates the ground water elevations at the site,based <br /> upon data collected during this monitoring event Ground water flow rn the area is toward the north <br /> The overall northward trending flow is consistent with the regional ground water flow in the area <br /> 42 ANALYTICAL RESULTS OF GROUND WATER SAMPLES <br /> TPH-g was detected in MW-2 at concentrations of 72 parts per billion (ppb, reported as micrograms <br /> per liter, equivalent to ), respectively BTE&X were detected in MW-2 at concentrations up to 0 39 <br /> ppb(toluene,MW-6) Petroleum hydrocarbons were not detected in any of the additional monitoring <br /> wells sampled MTBE was not detected in the samples collected Analytical results of ground water <br /> samples are summarized in Table 2 -Analytical Results of Ground Water Samples The laboratory <br /> report (Alpha Analytical Laboratory batch No 96-1107-007) and chain-of-custody are presented in <br /> Appendix B <br /> 43 ANALYTICAL RESULTS OF SOIL SAMPLES <br /> Petroleum hydrocarbons (TPH-g or BTE&X) were not detected in the soil samples collected from <br /> the stockpiled soil undergoing aeration MTBE was also not detected in the samples collected <br /> Analytical results of stockpiled soil samples are summarized in Table 3 -Analytical Results of Soil <br /> Samples The laboratory report(Alpha Analytical Laboratory batch No 96-1107-007) and chain-of- <br /> custody are presented as Appendix B <br /> 5.0, CONCLUSIONS AND RECOMMENDATIONS <br /> 51 CONCLUSIONS <br /> Based upon results of the soil probing investigation and monitoring well installation, AGE has the <br /> following conclusions <br /> • Between June and November 1996,concentrations of TPH-g and BTE&X decreased in wells <br /> MW-2 and MW-6 The low concentrations of dissolved hydrocarbons detected in monitoring <br /> well MW-2 indicate that dissipation of hydrocarbons is ongoing at the site Dissolved <br /> Shydrocarbons have dissipated or migrated from the previously impacted monitoring wells <br /> i <br />