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23 October 1995 <br /> AGE-NC Project No 95-0104 <br /> Page 4 of 5 <br />' (approximately 11 feet per rule) directed S 78° E is generally to the southeast with a gradient at <br /> approximately 0 0015, or approximately 8 feet per mile(Figure 3) Between April and July 1995, the <br />' ground water flow direction rotated 62' from northeast to southeast <br />' 4 2 ANALYTICAL RESULTS OF GROUND WATER SAMPLES <br /> During the April 1995 sampling, TPH-g was detected in MW-1 at 540 gg/l (parts per billion ppb) <br /> Neither TPH-g nor BTE&X were detected in any other well during the April 1995 sampling <br /> TPH-g, benzene, toluene and xylene were detected in MW-1 during the July 1995 monitoring at <br /> concentrations of 570, 12, 1 6 and 17 ppb, respectively Benzene was also detected in the sample <br /> from MW-4 at 0 5 ppb No TPH-g or BTE&X were detected in other wells during the July 1995 <br /> sampling Analytical results of TPH-g and BTE&X in ground water are summarized in Table 2 The <br /> laboratory report and chain-of-custody are included in Appendix B <br /> HVOCs were detected in samples from each well during both sampling events at concentrations <br /> ranging from 0 75 ppb (chloromethane in MW-3, Apnl 1995)to 280 ppb(1,2-dichloroethane m MW- <br /> 1, July 1995) Analytical results of HVOCs in ground water are summarized in Table 3 The <br /> laboratory report and chain-of-custody are included in Appendix B <br />' 43 ANALYTICAL RESULTS OF PURGED WATER SAMPLES <br /> No TPH-g, benzene, ethyl benzene or xylene were detected in the three composite drum samples <br /> Toluene was detected in composite sample WS-3 at a concentration of 0 44 ppb HVOCS were <br /> detected in two of the three composite samples ranging from 0 62 ppb (1,2-dichloroethane, WS-2) <br /> to 2 8 ppb (l,l-dichloroethane, WS-1) The Iaboratory report and chain-of-custody are presented <br /> in Appendix C <br /> 5.0. CONCLUSIONS & RECOMMENDATIONS <br /> Dissolved petroleum hydrocarbons in ground water has consistently decreased over the past year in <br /> wells MW-2, MW-3 and MW-4 During the most recent sampling (July 1995) only toluene was <br /> detected above the method reporting limits in MW-4 However, hydrocarbons continue to be present <br /> in MW-1 It is likely that natural attenuation and the rise in groundwater have contributed to the <br /> decrease in hydrocarbon concentrations in MW-2, MW-3 and MW-4 <br /> Several HVOCs continue to be present in each well on the property The source of these compounds <br /> is questionable It is possible that they entered the ground water via the septic system on-site <br />