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• 14 July 1997 <br /> AGE-NC Project No 95-0144 <br /> Page 2 of 3 <br /> hydrocarbons quantified as gasoline(TPH-g), diesel (TPH-d), and motor oil (TPH-mo) and volatile <br /> aromatic compounds (benzene, toluene, ethylbenzene and xylenes, BTE&X) with methyl tertiary- <br /> butyl ether (MTBE), in accordance with EPA methods 5030 and 602,respectively <br /> 3.0. FINDINGS <br /> 3 1 RELATIVE GROUND WATER ELEVATION AND GRADIENT <br /> The relative elevation of ground water in each well was calculated by subtracting the depth to water <br /> from the surveyed casing elevation(Table 1) Ground water elevation decreased an average of 2 33 <br /> feet between February 1997 and May 1997 The approximate hydraulic gradient for the current <br /> monitoring period was calculated to be 0 004 ft/ft with a northerly flow direction Ground water <br /> elevation contours derived from data collected on 06 May 1997 are depicted in Figure 3 <br /> 32 ANALYTICAL RESULTS OF WATER SAMPLES <br /> During the May 1997 monitoring period, TPH-g was detected in <br /> wells MW-1 and MW-5 at <br /> concentrations of 340 parts per billion (ppb, reported as micrograms per liter) and 55 ppb, <br /> respectively, TPH-d was detected in wells MW-1, MW-2, MW-4, MW-5, MW-8 and MW-13 at <br /> concentrations between 55 ppb and 200 ppb TPH-mo was not detected in samples collected during <br /> the May 1997 monitoring event <br /> BTE&X were detected in sample collected from MW-1 at concentrations of 1 5 ppb, 0 54 ppb, 18 <br /> ppb and 18 ppb, respectively Xylenes were detected in sample collected from MW-5 at a <br /> concentration of 5 4 ppb Petroleum hydrocarbons were not detected in samples collected from wells <br /> MW-11, MW-12 or MW-18 <br /> Analytical results of ground water samples are summarized on Tables 2 and 3 The laboratory report <br /> (MAI Laboratory I D Nos 76237 - 76245) and chain-of-custody forms are included in Appendix <br /> B <br /> 4.0. SUMMARY/CONCLUSIONS <br /> Based upon data collected from the site, the following summary and conclusions are presented <br /> . Ground water elevation showed a significant decrease during the second quarter of 1997 <br /> This is consistent with seasonal variations at the site as well as findings at other sites in the <br /> Advanced GeoEavironmental,inc <br />