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r <br /> 29 Apnl 1998 <br /> AGE-NC Project No 96-0235 <br /> I j Page 2 of 3 _ <br /> 1 <br /> I <br /> organic compounds with oxygenated compounds in accordance with EPA Method 8260 <br /> ' f I <br /> 3.0. FINDINGS ' <br /> 3 1 GROUND WATER GRADIENT AND FLOW DIRECTION <br /> The elevation of ground water in each well was calculated by subtracting the ground water depth <br /> from the surveyed caslrig elevations Depths to ground water ranged from 17 46 feet to 18 74 feet <br /> below the tops of the well casings Ground water elevations at the site ranged from -10 28 feet in <br /> MW-5 to -11 46 feet in MW-3, an average rise in elevation of 4 76 feet <br /> The inferred ground water flow direction was toward the south The gradient was more steep toward <br /> the northeastern corner of the site, at MW-5 The inferred ground water flow direction and gradient <br /> do not match data previously collected at the site Ground water elevation contours are illustrated <br /> on Figure 3 v <br /> 32 ANALYTICAL RESULTS OF WATER SAMPLES <br /> I TPH-g was detected in MWA and MW-2 at concentrations of 550 parts per billion (ppb, reported <br /> as micrograms per liter) and 18,000 ppb, respectively Benzene was detected in the same wells at <br /> concentrations of 150 ppb and I,700 ppb, respectively Toluene, ethylbenzene, and xylenes were <br /> Idetected in the same wells at concentrations ranging from 1 1 ppb to 3,100 ppb Toluene and xylenes <br /> were detected in MW-3 at concentrations of 0 68 ,ppb and 0 87 ppb, respectively TPH-d was ; <br /> _detected in MW-1 and MW-2 at concentrations of 93 ppb and I 2,900 ppb, respectively Petroleum hydrocarbons were not detected in the samples collected from MW-4 or MW-5 <br /> A <br /> Oxygenated compounds were not detected in samples collected from the site during the February <br /> I1998 monitoring event 1,2,4-Tnmethylbenzene was detected in MW-2 at a concentration of 800 <br /> ppb Chloroform was detected In MW-3 at a concentration of 7 ppb Analytical results of all water ' <br /> samples collected at the site are summanzed on Tables 2 and 3 The laboratory report(MAI Sample <br /> I Nos 86209 through 86213), chain-of-custody form and QA/QC are included in Appendix B <br /> I <br /> 4.0. V F ^ y V L 4 r <br /> SUMMARY AND CONCLUSIONS , <br /> , - <br /> Based on the data collected from the site, AGE finds s' ' <br /> . The'highest concentrations of hydrocarbons in ground water continue to be detected in <br /> : Advanced GeoEnvironmental,Inc <br />