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19 February 1997 <br /> • AGE-NC Project No 95-0104 <br /> Page 5 of 6 <br /> One selected soil sample was collected from MW-6 at a depth of 60-feet and analyzed by Cooper <br /> Testing Lab, Inc for average permeability and percent porosity The average permeability was <br /> calculated at 6 X 10"5 cm/sec, while porosity was calculated at 43 10 percent The laboratory report <br /> (Cooper Testing Job No 282 01) and chain-of-custody are included in Appendix D <br /> 3 2 RELATIVE GROUND WATER ELEVATION AND FLOW DIRECTION <br /> Ground water depths at the site ranged from 69 71 to 70 79 feet Ground water at the site increased <br /> approximately 0 20 feet between August 1996 and December 1996 <br /> In August 1996, the gradient was calculated at 0 010 ft/ft (approximately 53 feet per mile) with a <br /> ground water flow direction generally S 70°E In December 1996, the gradient was calculated at <br /> 0 008 ft/ft (approximately 42 feet per mile) with a ground water flow direction generally N 83°E <br /> (Figure 3 - Relative Ground Water Elevations Map) Therefore, between August and December <br /> I996, ground water flow direction rotated approximately 27° from southeast to northeast <br /> l • 3 3 LABORATORY RESULTS OF GROUND WATER SAMPLES <br /> TPH-g was detected in ground water samples from wells MW-1, MW-5, MW-6 and VW-1 at <br /> concentrations ranging between 260 ygll and 28,000 ,ug/l (microgram per liter or parts per billion <br /> ppb) <br /> Benzene was detected in ground water samples from wells MW-5, MW-6 and VW-1 at <br /> concentrations ranging between 0 82 ,ug/1 and 97 yg/l, while other volatile aromatic compounds <br /> (toluene, ethylbenzene and xylenes) were detected from well VW-1 at concentrations up to 5,300 <br /> uJl <br /> MTBE was not detected from ground water samples collected during the December quarterly <br /> sampling event Analytical results of ground water samples are summarized in Table 3 -Analytical <br /> Results of Ground Water Samples The laboratory report ( AAL Batch No 96-1213-015) and chain- <br /> of-custody <br /> hain-ofcustody forms are presented in Appendix E <br /> 4 0. CONCLUSIONS AND RECOMMENDATIONS <br /> 41 CONCLUSIONS <br /> . Based upon data collected during this investigation, AGE has the following conclusions <br />