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Y <br /> 1 <br /> 13 February 1998 <br /> AGE-NC Project No 95-0121 <br />' Page 3 of 5 <br />' measurements could greatly modify ground water flow direction <br /> 32 LABORATORY RESULTS OF GROUND WATER SAMPLES <br /> TPH-g was detected in water samples collected from MW-1, MW-2, MW-3, MW-4 and MW-7 at <br />' concentrations ranging up to 53,000 parts per billion (ppb, reported as micrograms per liter) TPH-d <br /> was detected in samples collected from monitoring wells MW-1 through MVi7-8 at concentrations <br /> ranging up to 3,800 ppb <br /> BTE&X compounds were detected in samples collected from each well at concentrations ranging <br /> up to 12,000 ppb (benzene, MW-3) MTBE was detected utilizing EPA method 8260 iii samples- <br /> collected from MW-1, MW-2 and MW-5 at concentrations up to 190 ppb <br /> The laboratory report (McCampbell Analyt,cal Inc Lab I D 83402 to 83410) and chain-of-custody <br /> forms are presented in Appendix B, the results of the analysis are contained in Table 2 <br /> 4 0. DISCUSSION AND CONCLUSIONS <br /> - Based upon data collected during the No\ember 1997 monitoring, AGE has the following <br /> conclusions <br /> • Ground .�atei flow direction south of the site was estimated to be in a east flow direction(tile <br /> area containing MW-5 MW-6 and IN4W-9), ground water flow direction from the south <br /> section of the site was estimated to be in a east flow direction (the area containing MW-1, <br /> I MW-2, MW-3, MW-6 and MW-7), ground water flow direction from the middle to north <br /> sections of the site \\as estimated to be in a northwest flow direction (the area containing <br /> MW-1, MW-2, MW-4 1N4W-5 and MW-8) <br /> r • The ground water suiface elevation at the site continues to remain above: the slotted screened <br /> intervals in wells MW-,l through MW-9 Therefore, samples collected,from these wells may <br /> not be representative of actual surface ground water dissolved petroleum hydrocarbon <br /> concerti atrons <br /> • From August to November 1997, dissolved petroleum hydrocarbon constituents generally <br /> Iincreased in concentration from MW-1, MW-2 and MW-7 <br /> • The greatest concentrations of dis'solN ed petroleum hydrocarbons continues to be in the area <br /> of wells MW-I through MW-4 and MW-7, near the "core" of hydrocarbon-impacted soil <br /> • The laboratory reports for MW-1 through MW-4 and MW-6 through MW-9 indicated that <br /> Adraxced GeoEn.ironmental,Inc <br />