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06 April 1998 <br /> AGE-NC Project No 96-0229 <br /> Page 3 of 5 <br /> 32 DISSOLVED OXYGEN MEASUREMENTS <br /> During the February 1998 ground water monitoring event, dissolved oxygen measurements were <br /> recorded while purging the monitoring wells Dissolved oxygen measurements ranged from 0 36 <br /> parts per million (MW-3)to 2 40 parts per million (MW-1) Results of dissolved oxygen in ground <br /> water samples are summarized in Table No 2 <br /> 3 3 ANALYTICAL RESULTS OF GROUND WATER SAMPLES <br /> TPH-g was detected insam round water les collected from wells MW-1 through MW-3 and MW-6 <br /> g p <br /> at concentrations ranging as high as 180,000 parts per billion(ppb, reported as micrograms per liter) <br /> BTE&X compounds were detected in samples collected from each well at concentrations ranging <br /> p p g g <br /> I up to 34,000 ppb (toluene, MW-2) Benzene was detected in ground water samples collected from <br /> wells MW-1 through MW-6 at concentrations ranging as high as 13,000 ppb <br /> MTBE was detected utilizing EPA method 8020 in ground water samples collected from MW-1 <br /> through MW-6 at concentrations ranging as high as 1,700 ppb MTBE was conrinned utilizing EPA <br /> method 8260 in ground water samples collected from MW-1 through MW-3 and MW-6 at <br /> concentrations ranging up to 1,100 ppb <br /> TBA was detected for the first time in a ground water sample collected from MW-5 at a <br />' concentration of 6 8 ppb TAME, DIPS and ETBE were not detected in the laboratory analysis of <br /> any ground water samples The analytical results for ground water samples are suinmaiized in Table <br /> 40 SUMMARY AND CONCLUSIONS <br />' Based on the results of ground water monitoring and sampling activities performed in February 1998, <br /> AGE concludes <br /> • In February1998 the site adient was calculated at 0 006 ft/ft orapproximately.'5 feet er <br /> � gT � p <br /> mile <br /> • Ground water flow direction on the site was estimated to be toward the northwest in the area <br /> of the monitoring wells (figure 3) <br /> • TBA was detected for the first time in a water sample collected from well MW-5 <br /> • Laboratory data continues to indicate that the greatest concentrations of TPH-g impacted <br /> Adtiauced GeoEnI.ironmental,Inc <br />