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�r 24 August 1995 <br /> AGE NC Project No 95-0144 <br /> Page 4 of 8 <br /> and grease, LUF11 metals (cadmuum, chromium, lead, nickel and zinc), volatile organic compounds <br /> and sernivolatde organic compounds in accordance with EPA methods 5030, 8015m, 8020 (602), <br /> ' 413 1,6010(200 71239 2), 8240 and 8270, respectively Samples from GP13 to GP17 were analyzed <br /> for TPH-g, TPH-mo,BTE&X and total recoverable petroleum hydrocarbons (TRPH) in accordance <br /> with EPA methods 5030, 8015m, 8020(602) and 418 1 Samples from GP 16 and GP 17 were also <br /> analyzed for TPH-d in accordance with EPA method 8015m <br /> 4.0. FINDINGS <br /> s <br /> 4 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 relative casing elevation (Table 1) Ground water rose an average of 3 70 feet <br /> between December 1994 and May 1995 The approximate gradient was calculated to be 0 0042 Rift <br /> with a northern flow direction (Figure 3) The gradient and flow direction are very similar to that <br /> calculated for December 1994 <br /> 4 2 LABORATORY REPORT OF GROUND WA MR MONITORING <br /> TPH-g was detected in samples from MW-1 and MW-4 at concentrations of 560 ppb and 150 ppb, <br /> ' respectively Benzene and toluene were detected in MW-1 at concentrations of 13 ppb and 37,ppb, <br /> respectively Ethylbenzene was detected in MW-1, MW-4 and MW-5 at concentrations of 25 ppb, <br /> 0 71 ppb and 0 73 ppb, respectively Xylenes were detected in MW-1, MW-4 and MW-5 at <br /> ' concentrations of 140 ppb, 2 8 ppb and 4 8 ppb, respectively Petroleum hydrocarbons were not <br /> detected in samples from MW-2 or MW-8 The analytical results are summarized on Table 2 The <br /> laboratory report and chain-of-custody form are included in Appendix B <br /> 43 STRATIGRAPHY <br /> ' <br /> Clays were encountered from the surface to depths of approximately 8 feet Silts were encountered <br /> Y P pP Y <br /> from 8 feet to approximately 15 to 20 feet with increasing grain size downward Silty sands were <br /> encountered from below the silts to approximately 24 feet Larger grained silty sands were <br /> encountered from approximately 24 feet to the bottom of the probings(25 5 feet) <br /> I ' <br /> r <br />