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_ <br /> y <br /> 05 June 1998 r a_ <br /> AGE-NC Project' <br /> No 96-0232 _ <br /> M <br /> Page 3 of 4 <br /> 1 , t <br /> k <br /> "drowned", and may not yield samples fully representative-of ground water conditions near the top <br />�I a of the saturated zone, where fuel hydrocarbons would be exPect_ed to have the greatest impact . <br /> , <br /> In February 1998, the gradient was calculated to be 0 012 ft/ft, or approximately 63 feet'per mile f 3 ' <br /> (Figure 3) Generally,ground water monitoring data collected at the site indicated a northeast ground a <br /> water flow direction Based on a northeast flow direction, well MW-4 is generally located in a <br /> downgradient direction of the former UST area r <br /> 3 2 DISSOLVED OXYGEN MEASUREMENTS ; <br /> During the February 1998 ground water monitoring event, dissolved oxygen measlarements,were <br /> recorded after purging the monitoring wells Dissolved oxygen measurements ranged from 0 97 ` <br /> milligrams'per liter(mg/1) iii MW-4 to 1 72 mg/l in MW-2 Results of dissolved oaygen,in giound <br /> water samples are summarized in Table No 2 r <br /> ,r <br /> 3 3 LABORATORY RESULTS OF GROUND WATER SAMPLES <br /> Utilizing EPA method 8015M, TPH-g and TPH-d were not detected in the giound'water samples <br /> collected from wells MW-1, MW-2 or MW-4 <br /> Utilizing EPA method 8020, BTE&X compounds were not detected in'any ground water samples, <br /> however MTBE was detected in all three wells by EPA method 8020 at concentrations ranging up } <br /> to 470 parts per billion (micrograms per liter ppb) The presence and concentrations of MTBE in <br /> the samples were confirmed'utilizing EPA method 8260 at concentrations ranging up to 400 ppb a <br /> TAME, DIPE, TBA and ETBE were not'detected by laboratory analysis of airy of the ground watei <br /> samples , <br /> The laboratory report(McCampbell Analytical Inc LaboratoryI D No 86'113 to 861 1'5) and chain- <br /> of-custody forms are presented in Appendix B, the results of the analysis are contained in Table 3 ; <br /> I , <br /> 4,0. DISCUSSION AND CONCLUSIONS <br /> ` Based upon data collected during the February 1998 monitoring, AGE concludes, _ { <br /> it <br /> • Generally, monitoring data collected at the site indicated that ground water wasrflowing' <br /> toward the northeast at a gradient of approximately 0 012 ft/ft { <br /> Advanced GeoEn iron mental,Inc <br />