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16 October 1996 <br /> AGE-NC Project No 96-0211 <br />' Page 4 of 6 <br />' 3 2 2 COLLECTION AND ANALYSIS OF GROUND WATER SAMPLES <br /> Water samples were collected from each monitoring well using new disposable bailers The samples <br /> were transferred into 40-m1 EPA vials containing hydrochloric acid as a preservative The samples i <br />' were transported in a chilled container to MAI and analyzed for TPH-g, BTE&X with MTBE in <br /> accordance with EPA method 5030/8015m and 602, respectively <br /> 1 <br /> 4.0. FINDINGS <br />' 41 STRAfIGRAPHY <br />' Tan and gray, silty-clay was encountered from surface grade to depths of approximately fifteen feet <br /> bsg'in borings B4 (MW-1) and B3 (MW-2) Tan and gray, silty-clay was encountcred from surface <br /> grade to depths of six feet bsg in borings B 1 and B2 Gray, sandy grdrel was encountered at depths <br /> between 10 and 15 feet bsg in borings B 1 and B2 <br /> 42 LABORATORY RESULTS OF SOIL BORING SAMPLES <br />' TPH-g was not detected in any of the samples submitted to the laboratory for analysis However, <br /> trace concentrations of ethylbenzene and xylenes were detected in a soil sample from MW-1 at <br /> concentrations of 0 005 and 0 007 milligrams per kilogram mg/kg (per million ppm),respectively <br />' Analytical results of soil boring samples are summarized on Table 2 The laboratory report (MAI <br /> Laboratory ID 66470 through 66475) and chain-of-custody are presented in Appendix D <br /> I <br /> 43 GROUND WATER ELEVATION AND GRADIENT <br />' The elevation of ground water in each well was calculated by,subtracting the depth to ground water <br /> from the surveyed casing elevation (Table 1) Monitoring well casing elevations were surveyed <br />' relative to monitoring well MW-1 Ground water gradient on 11 July 1996 was calculated to be _ <br /> 0 003 ft/ft directed N 23° W The relative ground water elevation at the site is illustrated in Figure <br /> 3 - Relative Ground Water Elevation <br /> 44 LABORATORY RESULTS OF GROUND WATER SAMPLES <br />' The water sample collected from boring B 1 contained 9 100 micrograms per liter /L arts per <br /> p g � g P �g � <br /> billion ppb) BTEX were also detected at maximum concentrations of 30 ppb of xylene <br />