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I <br />' 19 October 2005 <br /> AGE-NC Project No 99-0645 <br />' Page 3 of 6 <br />' values had generally stabilized by the end of the purging process (Appendix B) Purged water was <br /> stored on-site in 55-gallon, department of transportation (DOT)-approved drums <br />' 2 4 COLLECTION AND ANALYSIS OF GROUND WATER SAMPLES <br />' Prior to collection of ground water samples, the depth to ground water was re-measured in each <br /> purged well to ensure that a minimum of 80% of the well volume had recharged Then a water <br /> sample was collected from each well using the dedicated disposable plastic bailer Each water <br />' sample was transferred into three chilled 40-milliliter (ml) volatile organic analysis (VOA) vials <br /> containing 0 5 ml hydrochloric acid (18%) as a sample preservative and one 1-liter amber bottle <br /> After collection,the samples were labeled and placed in a chilled container for transportation under <br />' chain of custody to CTEL, a California DHS-certified analytical laboratory, in Paramount, <br /> California Each sample was analyzed for <br />' • TPH-g and diesel (TPH-d) by EPA Method 8015M, <br /> • BTEX and the oxygenated fuel additives MTBE,tertiary butyl alcohol (TBA), di-isopropyl <br /> ether(DIPE),ethyl tertiary butyl ether(ETBE)and tertiary amyl methyl ether(TAME),ethyl- <br /> I dibromide (EDB) and 1,2-dichloroethane (1,2-DCA) by EPA Method 8260 Modified <br /> I <br /> 3.0. FINDINGS <br /> From field data collected at the SVE remediation unit between March and July 2005, AGE <br /> determined the average TPH-g concentration and the average air flow rate, and calculated the <br /> I approximate mass and volume of hydrocarbons removed Groundwater elevation and flow direction <br /> were determined from the field data collected in April and July 2005,hydrocarbon-impact to ground <br /> water was inferred from laboratory analysis of the samples <br /> I <br /> 3 1 SOIL-VAPOR EXTRACTION <br /> During the second and third quarters 2005, the SVE unit operated at an average air flow rate of 64 <br /> to 85 scfm, generating an induced vacuum(negative pressure)of approximately 15 up to 44 inches <br /> I of water, measured in the piping between the blower and extraction well The SVE unit operation <br /> was continuous over the two quarter, until 29 July when the system was disengaged due to the lack <br /> of hydrocarbons in the influent vapors <br /> I13 April TPH- and BTEX compounds were not detected from the influent SVE sample nor the <br /> • p g p p <br /> IAdvanced GeoEnvaronmental,Inc <br /> I <br />