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I ' 04 August 2000 AGE-NC Project No 97-0300 ' Page 7 of 10 ' 33 LABORATORY ANALYSIS OF GROUND WATER SAMPLES Each ground water sample was logged on a chain-of-custody form, placed In a chilled container and ' transported to a DHS-certified laboratory for analysis for • TPH-g and TPH-d by EPA Method 8015 Modified, ' • BTEX and MTBE by EPA Method 8020, and • Methanol, ethanol, TBA, DIPE, ETBE, TAME, EDB, 1,2-DCA and MTBE by EPA Method ' 8260 Modified 34 FINDINGS Ground water elevation, flow direction and gradient were determined from field data collected on 16 June 2000, laboratory analysis of three ground water samples detected TPH-d and MTBE in one sample 3 4 1 RELATIVE GROUND WATER ELEVATION AND GRADIENT The depths to ground water in wells MW-I, MW-2 and MW-3 were measured between 39 20 and 42 70 feet below the tops of the well casings Ground water elevations at the site were calculated to Ibe between 24 95 feet and 26 12 feet below mean sea level, ground water elevations are depicted in Figure 9 Ground water elevations at the site decreased an average 1 02 feet between the 09 June I 2000 well development activities and the 16 June 2000 ground water monitoring event On 09 June 2000, the general ground water gradient at the site was calculated to be approximately 0 01 fl/ft or approximately 53 feet per mile and directed towards the southeast (Figure 8), on 16 June 2000, the I general gradient was calculated to be approximately 0 02 ft/ft and directed towards the north(Figure 9) I3 4 2 LABORATORY RESULTS OF GROUND WATER SAMPLES TPH-d was detected In the water sample collected from well MW-1 at a concentration of 68 gg/1, the laboratory reported the sample chromatogram as having significant diesel range compounds MTBE was detected by EPA Method 8260 in the water sample collected from well MW-1 at a concentration of 2 gg/l Advanced GeoEnVLron mental,Inc I