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19 .Tune 2000 <br /> AGE-NC Project No 95-0103 ' <br /> ' Page 3 of 5 <br /> 3 1 GROUND WATER ELEVATION <br /> The ground water elevations were calculated by subtracting the depths to ground water from the <br /> surveyed well casing elevations (Table 1) <br /> Ground water elevation increased approximately 2 98 feet between the December 1999 and Apnl <br /> 2000 monitoring events The upper surface of the saturated zone on the site appears to slope toward ` <br /> ` the south and southeast(toward wells MW-5 and MW-4) <br /> ' Monitoring well MW-1 has been slow to recharge during sampling events and continually <br /> demonstrates a lower ground water elevation value The well may not be responding properly to <br /> changing ground water elevations, therefore'the ground water elevation value for well MW-1 has <br /> ' been omitted from the ground water gradient and flow model Figure 3 depicts the ground water E <br /> elevation contours at the site <br /> 3 2 HYDROCARBON-IMPACTED GROUND WATER <br /> Eight water samples were analyzed by MAI <br /> • TPH-g was detected in samples from monitoring wells MW-1, MW-3, MW-4, MW-,5, and <br /> vapor wells VE-1 and VE-6 at concentrations of 3,000 microgram per liter(µg/1), 7,700µg/l, <br /> 17,000,ug/l, 1,000µg/l, 1,700 µg/1 and 10,000µg/1, respectively <br /> • The greatest concentrations of hydrocarbons as gasoline were detected at the location of well <br /> ' MW-4 and toward the west to the location of VE-6 <br /> ' Benzene was detected In five of the water samples at concentrations ranging from 58 µg/l' <br /> in well VE-1 to 4,300 µg/1 in well MW-4 The most significant concentrations of toluene, <br /> ethylbenzene and xylene were detected In the water samples collected from wells MW-4 and, <br /> ' vapor well VE-6 <br /> • MTBE was detected In the water sample from well MW-1 at a concentration of 14 µg/1 <br /> DIPE was detected In the water samples from wells MW-3, MW-5 and vapor wells VE-1 and <br /> ' VW-6, at concentrations as great as 66µg/1 <br /> • EDB and 1,2 DCA were not detected above laboratory reporting limits`in any of the ground <br /> ' water samples analyzed <br /> ' The analytical results of current and previous monitoring well samples are summarized in Tables , <br /> 2 and 3 The laboratory report of the current ground water sampling data(MAI sample ID Numbers <br /> 34917, through 34924), quality assurance and quality control (QA/QC) data and chain-of-custody I <br /> farm are included in Appendix B <br /> Advanced GeoEmironmental Inc <br /> , 2 <br /> , <br />