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1 , <br /> I <br /> 04 May 2005 <br /> AGE-NC Project No 95-0142 <br />' Page 4 of 9 <br /> 1 <br />' The water was then transferred into EPA-approved 40-milliliter(ml)volatile organic analysis(VOA) <br /> vials containing 0 5 ml hydrochloric acid(18%)as a sample preservative The vials were labeled and <br /> placed in a chilled container for subsequent transport under chain of custody to MAI Laboratory <br /> Ground water-samples were analyzed for the following <br /> • TPH-g in accordance with EPA Method 8015 Modified, <br /> • BTEX in accordance with EPA Method 8021, and <br /> • The oxygenated fuel additives MTBE, DIPE, ETBE, TAME and TBA in accordance with <br />' EPA Method 8260B <br />' 3.0. FINDINGS <br />' From field data collected at the SVE remediation system between December 2004 and late <br /> March 2005 AGE determined the TPH-g concentration of hydrocarbons removed Analytical results <br /> of influent ground water samples and ground water extraction measurements were used to evaluate <br />' the volume of impacted ground water removed and mass of hydrocarbons treated <br /> Ground water elevation, flow direction and gradient were determined from field data collected on <br />' 13 January and 29 March 2005 The contaminant impact to ground water was quantified by the <br /> ground water laboratory data <br /> 3 1 SOIL-VAPOR EXTRACTION <br /> 1 <br />' The SVE unit operated at flow rates ranging between 110 and approximately 115 cubic feet per <br /> minute(cfin) An induced vacuum(negative pressure)of approximately 25 to 30 inches ofwater was <br /> measured in the piping between the blower and the extraction wells Hydrocarbon concentrations <br /> were not detected in the soil-vapor samples The analytical results are summarized in Table 2 The <br /> laboratory reports (MAI Work Orders 0412341, 0501229, 0501347, 0502287, 0503001, 0503343 <br />' and 050353 1) quality assurance/quality control (QA/QC) reports and chain of custody forms are <br /> included in Appendix C <br /> Concentrations of extracted organic vapor measured with the OVM were higher compared to-the <br /> analytical results from the soil-vapor samples The highest concentration of organic vapor measured <br /> with the OVM was 58 parts per million by volume (ppmv) (Appendix B) <br /> • <br /> Advanced GeoEnvironmeotal,Inc <br />