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1 <br /> 13 December 1999 <br /> AGE-NC Project No 95-0173 <br /> Page 4 of 5 <br />' 2 through MW-4, VW-1, AW-1B, and AW-2B at concentrations as high as 83 µg/l, DIPE was <br /> detected from well MW-4 at a concentration of 2 3 ugll No other fuel oxygenates were detected <br /> above laboratory reporting limits Analytical results of the ground water samples are summarized <br />' in Table 2 The laboratory reports (Castle Analytical Laboratory Reference No 2549 and <br /> McCampbell Analytical Inc I D No 23811 through 23825) and chain-of-custody forms are <br /> presented in Appendix B <br /> 4.0. CONCLUSIONS <br />' Based upon data collected during the October 1999 monitoring, AGE concludes <br />' • A general northeast ground water flow direction occurs in the area bound by wells MW-1 <br /> through MW-12 at an approximate gradient of 0 003 <br />' • Wells AW-1B and AW-2B yields data representative of deeper ground water conditions <br /> • The elevated petroleum hydrocarbon concentrations detected in water samples collected from <br /> wells MW-1, MW-2, MW-3, MW-4 (screened between 30 and 50 feet bsg) and VW-1 <br /> 10 (screened between 15 and 35 feet bsg) suggest that these wells may be screened within or <br /> near the dissolved petroleum hydrocarbon "core area" of the plume <br />' • A significant increase in dissolved petroleum hydrocarbon concentrations was observed in <br /> water samples collected from deeper screened ground water monitoring wells AW-1B <br /> (screened 50 to 60 feet bsg) and AW-2B (screened 60 to 70 feet bsg) <br />' 0 The dissolved petroleum hydrocarbon plume appears to be sufficiently contained within the <br /> current array of ground water monitoring wells <br /> 5.0. RECOMMENDATIONS <br /> Based upon the results of this investigation, AGE recommends a reduction of quarterly <br /> monitoring/sampling events to semi-annual monitonng/samplmg events pending initiation of a <br /> remedi allyl! oystelAl at elle site DCLLa VV111.►ited 11Vlll 13 1IIUIIILVIII16 GVL+IILJ 1,V11UUULGU CLL L 1G 61LG 3111C.G <br /> August 1996 demonstrates a well-defined, stable plume Until remediation is initiated, it is not <br /> anticipated that data obtained from additional monitoring events will enhance or modify the current <br /> plume model The remediation system start-up is tentatively scheduled during the first quarter of <br /> 2000 <br /> 0 <br /> IAdvanced GeoEnvlronmcntal,Inc <br />