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09 March 1998 <br /> • AGE-NC Project No 95-0173 <br /> Page 3 of 5 <br /> 3 2 DISSOLVED OXYGEN MEASUREMENTS <br /> During the January 1998 ground water monitoring event, dissolved oxygen measurements were <br /> recorded while purging the monitoring wells Dissolved oxygen measurements ranged from 0 58 <br /> mg/l (AW-2B) to 3 38 mg/1 (MW-7) Results of dissolved oxygen in ground water samples are <br /> summarized in Table No 2 <br /> 3 3 ANALYTICAL RESULTS OF GROUND WATER SAMPLES <br />' TPH-g was detected in ground water samples collected from wells MW-1 thaough MW-4, MW-6, <br /> MW-9, VW-1, AW-1B and AW-2B at concentrations ranging as high as 200 arts per billion <br /> (ppb,reported as micrograms per Iiter),TPH-d was detected in wells MW-1 through MW-4,MW-6, <br /> MW-9, VW-1, AW-1B and AW-2B at concentrations ranging as high as 22,000 ppb <br />' BTE&X compounds were detected in samples collected from each well at concentrations ranging <br /> up to 52,000 ppb (toluene, VW-1) Benzene was detected in ground water samples collected from <br /> wells MW-1 through MW-4, MW-6, MW-9, VW-1, AW-1B and AW-2B at concentrations ranging <br /> as high as 21,000 ppb <br /> MTBE was detected utilizing EPA method 8020 in ground water samples collected from MW-3 at <br /> a concentration of 320 ppb MTBE was confirmed utilizing EPA method 8260 in ground water <br /> samples collected from MW-1 through MW-4, VW-1 and AW-1B at concentzations ranging up to <br /> 120 ppb <br /> TBA was detected in ground water samples collected from MW-3, MW-4, MW-6 and VW-1 at <br />' concentrations ranging up to 81 ppb, D1PE was detected from MW-3 at a concentration of 6 2 ppb <br /> TAME and ETBE were not detected in the laboratory analysis of any ground water samples The <br /> analytical results for groundwater samples are summarized in Table 3 <br /> 4.0. SUMMARY AND CONCLUSIONS <br /> Based on the results of ground water monitoring and sampling activities performed in January 1998, <br /> AGE concludes <br />' In January 199$ the gradient was approximately 0 003 ft/ft or approximately 17 feet per <br /> • �' � g PP Y � PP <br /> mile <br /> • Ground water flow direction on the site was estimated to be toward the northeast in the area <br /> of the monitoring wells (figure 3) <br />' Advairce[!GeoEn�ironmenisl,Inc <br />