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' ' 30 August 1999 AGE-NC Project No 97-0312 ' Page 6 of 8 3 3 ' , GROUND WATER ELEVATION AND GRAD' IENT Groundwater elevation decreased an average of 3 17 feet at the farmer USTs location sine March 1999 monitoring event Ground water flow direction was ie the a gradient of 0 0015 ft/ft The flow direction is similar to previousmoniitoring�evts northeasterly with Ground Water Elevation depicts the contours for June 1999 - Static ground water was approximately 13 to 14 feet above the screened interval and UST-4, approximately five feet over the screened interval of UST-S, and approximately OST-3 above the screened interval in UST-6 A minimurn Of 80% recharge was measured in each welt immediately following purging ell' 34 ANALYTICAL RESULTS OF GRAB WATER SAMPLES TPH- and TPH- g d were detected in each of the grab water samples collected from borings B 14, B 15 and B17 at concentrations ranging from 460'parts per billiod(ppb, reported as micrograms to 9 200 ppb Benzene, toluene, ethylbenzene and xylenes w g per liters concentrations as high as 4,50 b y were detected in these samples at concentration of each constituent was 2detected 4 n tphe samplepb and � respectively The highest detected by EPA Method 8260m in the water samples p collected from B 17 MTBE was 6 4 ppb' 8 4 ppb and 9,700 ppb, iespectiveiN Tert-butanol$vas�detected IB 15 and BB 15 17 tat concentrations n of 14 ppb Other oxygenates were not detected in the grab water samples rhe laboiatoi r a concentration the giab-water samples (MAI Sample Nos 1,202-13204) and chain-of-custody forms a e eport for in Appendix B included 3 5 ANALYTICAL RESULTS OF GROUND WATER SAMPLES i r - TPH-g and TPH�d were detected in the 'Aater samples collected from monitoi in through UST-6 at concentrations as high as' 1,900 ppb and 340 ppb, respectively BTIs UST-2 detected at concentrations as high as 230 ppb, Y EX were L } OX)genates were not detected in the water samples collected from wetly UST-2 throe Acetone, 1,2-dichloroetliane (1,2-DCA), methyl ethyl ketone, 1,2,4-trimethylbenzene an UST-6dS ,5 trimethylbenzene were variously detected in the samples collected The 1,2-DCA was detected in sample UST-5 at a concentration of 1,100 ppb Other volatile organic compounds were not detected in ground water samples from the site The laboratory report(MAI sample Nos 13580 - 13584 and M chain-of-custody forin'are included in A ) ` June 1999 are summarized on,Table 5 Thecanalytical 1resultslof all resultwa water ss of ter samples collected in a nples are summarized Adt Meed GcoF m tt onttti ot.tl,Inc