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10 May 1999 <br /> ` AGE-NC Project No 96-0232 <br /> Page 4 of 5 <br /> 4.0. SUMMARY AND CONCLUSIONS <br /> Based upon data collected during the February 1999 ground water monitoring, AGE concludes <br /> • Ground water in the area of monitoring wells MW-1, MW-2, MW-6A and MW-7 was <br /> inferred to be flowing northeast at a gradient of 0 001 ft/ft (Figure 3), ground water in the <br />' area of wells MW-2, MW-4 and MW-5 was inferred to be flowing south-southeast at a <br /> gradient of 0 001 ft/ft <br /> • Ground water elevation at the site increased an average 3 60 feet between the November <br />' 1998 and February 1999 ground water monitoring events <br /> • Ground water was approximately 35 feet above the screened intervals in monitonng,well <br /> MW6-B Therefore this wells is "drowned", and yields a sample fully representative of <br /> deeper screened ground water that may be under confined or semi-confined conditions <br />' • TPH-g was detected in a water sample collected from MW-1 during the February 1999 <br /> sampling event at a concentration of 430 micrograms per liter(,cg/1) <br /> • TPH-d was detected in water samples collected from MW-1,MW-2,MW-4,MW-5,MW-6A <br /> and MW-7 at concentrations ranging as high as 160 ,cg/l, TPH-d was detected in deeper <br /> screened water from MW-6B at a concentration of 1,500 kcg/l The laboratory reported that <br /> the diesel chromatograms for all of the analyzed samples did not have typical diesel <br /> characteristics <br /> • MTBE was detected from all seven ground water samples utilizing EPA Method 8020 at <br />' concentrations as high as 1,000 µg/l, MTBE was confirmed at water wells MW-1, MW-2, <br /> MW-4, MW-6A, MW-6B and MW-7 utilizing EPA Method 8260 <br /> • MTBE was detected at 4 1 ppb in the sample collected from MW-6B, screened between 43 <br /> and 48 feet bsg <br />' • MTBE concentrations have steadily increased in ground water samples collected from MW-1 <br /> between July 1996 and February 1999, MTBE concentrations have steadily increased in <br /> ground water samples collected from MW-7 between July 1998 and February 1999 <br />' • MTBE has impacted the domestic water well located 150 feet west-southwest of the subject <br /> site, at a concentration of 38 lag/l as detected in the shallow ground water sample collected <br />' from MW-7 MTBE was detected utilizing EPA Method 8020 and confirmed utilizing EPA <br /> Method 8260 from the drinking water well sample at a concentration of 7 6µg/l <br /> Advanced GeoEnvironmental,Inc <br /> 1 t <br /> � r R <br />