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30 September 1996 <br /> AGE-NC-95-0112 <br /> Page 4 of 6 <br /> 3.0. FINDINGS <br /> 1 3 1 GROUND WATER ELEVATION AND FLOW DIRECTION <br />' The relative ground water elevation data is given in Table 1 Between April and May 1996, ground <br /> water elevation rose an average of 0 35 feet Ground water elevation decreased an average of 161 <br /> feet between May and July 1996 Ground water mounding was observed during the May and July <br /> monitoring events Greater variation in ground water elevation was observed in MW-1 relative to <br /> other wells during the second quarter of 1996 Relative ground water elevations for May and July <br /> 1996 are depicted in Figures 3 and 4 <br /> 1 3 2 LABORATORY ANALYSIS OF GROUND WATER SAMPLES <br /> TPH-g was detected in the ground water sample collected from MW-1 at a concentration of 230 parts <br /> per billion (ppb, reported as micrograms per liter) Ethylbenzene and xylenes were detected in the <br /> sample from MW-1 at concentrations of 1 5 ppb and 14 ppb,respectively Petroleum hydrocarbons <br /> were not detected in samples collected from MW-3, MW-4, MW-5 or MW-7 Samples were not <br /> collected from MW-2,MW-6 or MW-8 during the current quarter The analytical results of all water <br /> samples are summarized in Table 2 The laboratory report(AAL, Batch No 96-0711-010)and chain- <br /> of-custody form are included in Appendix B <br />' 3 3 STRATIGRAPHY <br /> Predominantly silty fine- to medium-grained sand was encountered from surface grade to <br /> 1 approximately 42 feet below surface grade (bsg) A clay layer was encountered in probing P3 from <br /> approximately 12 feet bsg to 16 feet bsg Silt was encountered from 42 feet bsg to the bottom of the <br /> borings (55 feet bsg) Boring logs are included in Appendix C <br /> 3 4 LABORATORY AND FIELD EVIDENCE OF IMPACTED SOIL <br /> Organic vapor was detected in samples collected from the surface to 25 feet and from 35 and 40 feet <br /> bsg in probing P 1 at concentrations as high as 699 parts per million volume (ppmv) Significant <br /> concentrations of organic vapor was detected in samples collected from 15 feet to 25 feet and 40 feet <br /> to 55 feet bsg in probing P2 at concentrations as high as 1500 ppmv,but only traces of organic vapor <br /> were detected at a depth of 30 feet in P1 and at 30 and 35 feet in P2 Organic vapor was detected in <br /> samples collected at depth from 45 to 55 feet bsg in probing P3 Boring logs are included in <br /> Appendix C <br /> 1 <br />