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10 10 February 2005 <br /> AGE-NC Project No 98-0521 <br /> ' Page 5 of 6 <br /> 3 3 1 Analytical Results of Extraction Water Samples <br /> Thefollowing is a summary of the detected concentrations <br /> ary <br /> i0 06 August An influent sample was collected at a sample port before entering the remediation <br /> system TPH-g was detected at,a concentration of 450 µg/1 Xylenes were detected at a <br /> concentration of 17 1 µg11 MTBE was detected at a concentration of 48 µg11 <br /> ' 0 15 September An influent sample was collected at a sample port before entering the <br /> remediation system TPH-g was detected at a concentration of 200µg11 MTBE was detected <br /> ' at a concentration of 190 llg/l <br /> ' No analytes of concern were detected at or above laboratory reporting limits in the collected effluent <br /> ground water treatment samples Analytical results from the ground water extraction samples are <br /> summarized in Table 5 The laboratory reports(CTEL Project Nos CT214-0408054 and-0409097), <br /> ' QA/QC reports and chain of custody form are provided in Appendix F GeoTracker confirmation <br /> pages of the submitted laboratory electronic deliverable format (EDF) files are included in <br /> li Appendix E <br /> 3 3 2 Mass-Volume Removal Calculations <br /> ' During the third quarter of 2004, an estimated 0 18 lbs of TPH-g and 0 065 lbs of MTBE were <br /> extracted from ground water at the peripheral extraction well MW-2 The volumetric calculations <br /> ' from the ground water pump-and-treat system are presented in Appendix G <br /> ' 4.0. SUMMARY AND CONCLUSIONS <br /> ' The following conclusions were drawn from the results of the third quarter 2004 investigation <br /> • Ground water at the site was encountered at approximately 8 5 feet bsg The interpreted <br /> ground water flow direction at the site was southwest with an approximate gradient of <br /> 0 005 ft/ft, however, without depth to water measurements from well MW-2, which is <br /> currently utilized as an extraction well,there is insufficient well spacing to accurately define <br /> ' the ground water gradient and flow direction <br /> • TPH-g, MTBE, BTEX constituents and TAME were detected in the ground water sample <br /> collected from well MW-4,the concentrations of benzene and MTBE were above the DHS' <br /> Primary Maximum Contaminant Levels (MCLs) of 10 [,g/1 and 13 gg/l in drinking water, <br /> . respectively <br /> ' Advanced GeoEnvironmental,Inc <br />