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26 September 2003 <br /> AGE-NC Protect No 95-0128 <br /> Page 7 of 8 <br /> TPH-g, TPH-d,BTEX and MTBE were detected in the March influent sample at concentrations of <br /> 2,500µg/1 TPH-g,560µg/1 TPH-d,320µg/1 benzene,24µg/1 toluene, 10µg/1 ethylbenzene,310µg/1 <br /> xylenes and 250 µg/1 MTBE <br /> TPH-g, TPH-d, MTBE and BTEX were not detected in the effluent samples <br /> The analytical results are summanzed on Table 4 The laboratory reports for the quarterly monitoring <br /> event (MAI Laboratory ID Nos 0301169, 0302196, and 0303138), quality assurance and quality <br /> control (QA/QC) reports and the chain-of-custody form are included in Appendix E <br />' 3 5 MASS CALCULATION OF RECOVERED PRODUCT <br /> The mass of hydrocarbons removed was calculated from the volume of water treated and the <br /> concentrations from laboratory analysis A total volume of 92,546 gallons was extracted between <br /> 16 December 2002 and 31 March 2003, based on effluent flow meter observations <br /> I Based on the total water volume extracted, 0 086 kg/0 191 lbs of MTBE, 0 0072 kg/0 0159 lbs of <br /> benzene and 0 5578 kg/1 229 lbs of TPH-g were removed from the site and treated <br /> I The hydrocarbon mass removal calculations and the concentrations ofthe influent samples overtime <br /> are displayed in Appendix F <br /> I4.0. SUMMARY AND CONCLUSIONS <br /> The following conclusions were drawn from the results of this quarterly investigation <br /> • Ground water elevations measured during the February 2003 monitoring event ranged <br /> I between 20 05 and 21 22 feet below MSL, ground water flow direction at the site was <br /> inferred to be towards northeast and the east off-site <br /> • Dissolved petroleum hydrocarbons quantified as TPH-g and TPH-d were detected in ground <br /> water samples MW-4,MW-5 and VW-1,collected within the northeastern portion of the site, <br /> TPH-d was also detected in sample MW-7 <br /> • Various BTEX compounds were detected in ground water samples MW-1 through MW-5 <br /> and VW-1 The highest concentrations of VOCs were detected in sample VW-1, The <br /> benzene concentrations in samples MW-4,MW-5 and VW-1, the toluene concentration in <br /> VW-1 and the ethylbenzene and xylenes concentrations in MW-5 were above the DHS' <br /> Maximum Contaminant Levels (MCLs) in drinking water <br /> Advanced GeoEnvironmental Inc <br />