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- r � , I ' 01 November 2005 . AGE-NC Project No 95-0142 ' Page 6 of 8 ' r 970 µg/1 toluene,450 µg11 ethylbenzene and 1,900 µg11 xylenes MTBE was not reported for in the influent samples r , ' Analytical results of pump-and-treat water samples are summarized in Table 4 The laboratory reports (MAI Work Orders 0504315, 0505425, 0506301, 0507233, 0508395, 0509298) QA/QC reports and chain of custody forms are included in Appendix C 1 ' 3 2 2 Laboratory Analysis of Effluent Ground Water Samples - TPH-g/-d, BTEX compounds and MTBE were not detected in the effluent ground water treatment ' samples analyzed Analytical results of pump-and-treat water samples are summarized in Table 4, laboratory reports are provided in Appendix C ' 3 3 GROUND WATER MASS-VOLUME REMOVAL CALCULATIONS ' • During the second and third quarters of 2005, an estimated 43 lbs of TPH-g and 4 91bs of benzene were extracted from the ground water The second and third quarters 2005 volume to mass to weight calculations from the ground water pump-and-treat system are presented in Appendix D The results ' of the laboratory analyses are summarized in Table 4 r ' 3 4 GROUND WATER GRADIENT AND DIRECTION During the June ground water monitoring, depth to ground water at the site ranged between ' 27 36 feet and 28 62 feet below the tops of the monitoring well casings The ground water elevation in the wells ranged from 14 78 feet (MW-1) to 15 99 feet (MW-3) below mean sea level (MSL) During the September monitoring the depth to ground water at the site ranged between 28 26 feet and 29-22 feet below the tops of the monitoring well casings The groundwater elevation in the wells ' ranged from 15 71 feet (MW-1) to 16 90 feet (MW-3) below mean sea level (MSL), the average ground water elevation decreased 0 8 feet in wells MW-1 through MW-8 between the June and September monitoring events ' At the time,of the second quarter 2005 (June) ground water monitoring event the potentiometric surface appears generally southeasterly at a hydraulic gradient of 0 005 ft/ft At the time of the third quarter 2005 (September) ground water monitoring event the potentiometric surface appears generally easterly at a hydraulic gradient of 0 002 ft/ft The elevation of the ground water table at the site is illustrated on Figure 3 The elevation and ground water depth data are summarized in Table 5 Advanced GeoEnvironmental,Inc � r