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I f 09 March 2005 AGE-NC Project No 95-0121 Page 5 of 7 I ' below the tops of well casings The groundwater elevations were calculated to be between 11 97 feet (MW-9) and 13 20 feet (MW-1) below mean sea level (MSL), the ground water elevation data r obtained during this monitoring event is summarized in Table 3 The ground water flow direction ' - within the confined lower sand level of the aquifer was inferred to be radially inward toward a southeast-oriented ground water trough In the vicinity of well MW-1, under a hydraulic gradient of approximately 0 01 foot/foot (ft/ft) or less (Figure 3) I 3 4 LABORATORY RESULTS OF GROUND WATER SAMPLES ' ,TPH-g was detected in ground water samples MW-1 through MW-4 and MW-7 at a maximum concentration of 33,000 µg/l in well MW-1 (Figure 4) '^ BTEX samples compounds were detected in MW-1 through MW-4 and MW-7 at maximum p p g concentrations of 11,000 pg/l benzene, 1,700 µg/1 toluene, 1,100 pg/l ethylbenzene,and 2,300 µg/1 I xylenes in well MW-1 5 The fuel additive MTBE was detected utilizing EPA Method 8260B in the samples collected from wells MW-1 through MW-5 at concentrations as high as 200 µg/1 in well MW-1 In addition, DIPE was detected in sample MW-3 at a concentration of 7 2 pg/l,and TBA and 1,2-DCA were detected Iin,sample MW-4 at concentrations of 73 µg/l and 16 Rg/l, respectively No other analytes of concern were detected during the laboratory analysis of the ground water ' samples Previous and current analytical results of ground water samples are summarized in Table 5 The laboratory report('CAL Lab Nos 7172-1 W to-5W), QA/QC 'report,and chain of custody forms are provided in Appendix E Documents confirming the upload of laboratory electronic deliverable Iformat (EDF) files and depth to water measurements to GeoTracker are included in' Appendix F 4.0. SUMMARY AND CONCLUSIONS ` I The implications from third and fourth quarter 2004 environmental activities are as follows • The SVE unit operated for approximately 4,392 hours between 22 June and 22 December 2004,recovering a total of 3 82 61bs of TPH-g The concentrations of etroleum hydrocarbons detected m soil vapor samples collected at the SVE unit are considered to be acceptable for successful on-going SVE remediation • The net ground water flow direction for the area bound by wells MW-1 through MW-9 was inferred to be radially inward toward a southeast-trending ground water trough in the vicinity • of well MW-1, under hydraulic gradients of approximately 0 01 ft/ft or less The net I r Advanced GeoEnvnronmental,Inc