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' 20 September 2000 <br /> AGE-NC Project No 97-0333 <br /> ' Page 7 of 11 <br /> ' 3 2 GROUND WATER SAMPLING <br /> Following well purging, ground water levels from each well achieved a minimum of 80 percent <br /> recharge prior to sample collection Ground water samples were collected from the purged wells <br /> utilizing new, disposable polyethylene bailers and three 40-mI EPA-approved VOA vials containing <br /> 0 5 ml 18% hydrochloric acid as a sample preservative Care was taken to ensure that visible air <br /> ' bubbles were not present in the vials after filling and capping Ground water sample containers were <br /> labeled with the well designation, date, time, and sampler's initials <br /> ' 3 3 LABORATORY ANALYSIS OF GROUND <br /> WATER SAMPLES <br /> ' Each ground water sample was logged on a chain-of-custody form,placed in a chilled container and <br /> transported to a DHS-certified laboratory for analysis for <br /> ' • TPH-g by EPA Method 8015 Modified, <br /> • BTEX and MTBE by EPA Method 8020, and <br /> ' • • Methanol, ethanol,TBA, DIPE, ETBE, TAME, EDB, 1,2-DCA and MTBE by EPA Method <br /> 8260 Modified - <br /> 34 FINDINGS <br /> Ground water elevation, flow direction and gradient were determined from held data collected on <br /> ' 1 i July 2000, laboratory analysis of five ground water samples detected TPH-g and BTEX <br /> compounds in four samples, MTBE in three samples and TAME in one sample <br /> 3 <br /> 3 4 1 REI ATI`TE GROUND WAI ER ELEVATION AND GRADIENT <br /> The depths to ground water in wells MW-1, MW-2, MW-3, MW-4 and MW-5 were measured <br /> between 15 07 and 16 12 feet below the tops of the well casings Ground water elevations at the site <br /> were calculated to be between 16 85 feet and 16 95 feet above mean sca level, ground water <br /> ' elevations are depicted 1n Figure 11 Ground water elevations at the site decreased an average 0 11 <br /> feet between the 03 July 2000 well development activities and the 1 l July 2000 ground water <br /> monitoring e,,ent On 1 1 July 2000, the general ground water gradient at the site Naas calculated to <br /> ' he approximately 0 001 f1/f1 or approximately 5 feet per mile and directed towards thf, north (Flgure <br /> 1i } <br /> ' ldrunaed(.toFniuonrnua�ak ir�c <br /> t <br />