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k <br /> 17 December 1998 <br /> AGE-NC Project No 95-0173 <br /> Page 4 of 5 <br />' 2B but may have been masked due to raised detection limits <br /> Analytical results of the ground water samples are summarized in Table 2 The laboratory reports <br /> (Castle Analytical Laboratory Reference No 1822 and McCampbell Analytical Inc I D No 97734 <br /> through 97748) and chain-of-custody forms are presented in Appendix B <br />' 4.0. SUMMARY AND CONCLUSIONS <br /> Based upon data collected dunng the October 1998 monitoring event, AGE concludes <br /> • Ground water was inferred to be flowing toward the northeast at a gradient of 0 003 ft/ft, or <br />' approximately 16 feet per mile (Figure 3) Due to the low gradient at the site, slight <br /> variations in ground water measurements or changes of recharge/discharge of the local <br /> ground water could greatly modify ground water flow direction <br /> t4 The ground water surface elevation at the site is above the slotted screen intervals in wells <br /> MW-1 through MW-4,AW-1B and AW-213, therefore samples collected from these wells <br />'. may not be representative of dissolved petroleum hydrocarbon concentrations in shallow <br /> ground water <br /> o From July 1998 to October 1998, a substantial decrease in dissolved hydrocarbon- <br /> concentrations were observed in samples collected from wells MW-1, MW-2, VW-1, AW- <br /> IB and AW-2B (Table 2, Appendix C) <br />' • Various BTE&X compounds were detected in water samples collected from wells MW-1 <br /> through MW-4, MW-6, MW-9, VW-1, AW-1B and AW-213 at concentrations ranging <br /> between 4 7µg/1 and 37,000µg/1(toluene,VW-1) The greatest benzene concentration was <br />' detected m the sample from well MW-6 at a concentration of 28,000µg/1,between July 1998 <br /> and October 1998,benzene concentrations increased at MW-6 from 750µg/1 to 28,000µg/1 <br />' • TPH-g was detected in ground water samples collected from wells MW-1 through MW-4, <br /> MW-6, MW-8, MW-9, MW-12, VW-1, AW-1B and AW-213 at concentrations ranging as <br /> high as 150,000 µg/1 (V W-1) <br /> TPH-d wac detested to ormind water camnh-q rnllerti-d frnm wP11g MW-1 thrmiah MW-4 <br /> MW-6, MW-8, MW-11, MW-12,VW-1, AW-1B and AW-213 at concentrations ranging as <br /> high as 11,000µg/1 (MW-4) <br /> • Laboratory analysis of ground water samples indicates that the greatest concentrations of <br /> dissolved total petroleum hydrocarbons continues to be located near wells VW-1,MW-2, <br /> MW-3 and MW-4 (Figure 4) <br /> • <br />' .Advanced GcaEnvironmental,Inc <br /> I <br />