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r � , ,04 May 2005 AGE-NC Protect No 95-0142 r _ Page 6 of 9 u rOn 17 March 2005 TPH-g and BTEX compounds was not detected in influent sample VW-3 .� Analytical results of pump and treat water samples are summarized in Table 4,the laboratory reports ` r (MAI Work Orders 0412341,0501347,0502287,0503001 and 0503343)QA/QC reports and chain of custody forms are included in Appendix C r � Y 3 2 2 Laboratory Analysis of Effluent Ground Water Samples rTPH-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, rlaboratory reports are provided in Appendix C 3 3 GROUND WATER MASS-VOLUME REMOVAL CALCULATIONS During the first quarter of 2005 an estimated 47 24 lbs of TPH-g and 7 365 lbs of benzene were ' extracted from the ground water The first quarter 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 analysis are summarized in Table 4 3 4 GROUND WATER GRADIENT AND DIRECTION Y Depth to ground water at the site ranged between 27 90 feet and 29 00 feet below the tops of the E monitoring well casings,depth to ground water data from the extractions wells were not utilized due to modification of the casing tops as a result of remediation system installation The ground water elevation in the wells ranged from 15 41 feet(MW-1)to 15 89 feet(MW-718)below mean sea level (MSL),the average ground water elevation increased in well MW-4 through MW-8 and decreased E in well MW-3 since the previous monitoring event The elevation and ground water depth data is summarized in Table 1 E � + At the time of the first quarter 2005 (March)ground water monitoring event the potentiometric surface appears generally southeasterly at a hydraulic gradient of 0 0027 ft/ft The elevation of the, ' ground water table at the site is illustrated on Figure 3 I35 ANALYTICAL RESULTS OF GROUND WATER SAMPLES iTPH-g and BTEX compounds were not detected in samples collected from the monitored wells on Advanced Geofnvironmental,Inc