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i 28 January 2006 AGE-NC Project No 95-0121 IPage 5 of 9 t 2 3 2 Collection and Analysis of Ground Water Samples I Prior to sampling, the depth to ground water was re-measured to ensure that a minimum 80% well ' volume recharge had been achieved Ground water samples were collected from wells MW-1 `_- through MW-8 utilizing a Waterra inertia pump and dedicated plastic tubing,from wells EW-1,VW- 2 through VW-9, and MW-9, using a disposable polyethylene bailer The samples were transferred , ' into three 40-milliliter(ml)volatile organic analysis (VOA)vials, and into one 1-liter amber bottle The samples were logged on a chain of custody form, stored in a chilled container, and transported to CTEL for analysis The ground water samples were analyzed for • TPH-g and TPH-d in accordance with EPA Method 8015 Modified, • BTEX and MTBE in accordance with EPA Method 8260 B, and I • Fuel additives MTBE,di-isopropyl ether(DIPE),ethyl tertiary-butyl ether(ETBE),tertiary- amyl methyl ether (TAME), tertiary-butyl alcohol (TBA), 1,2-dibromoethane (EDB), and ' 1,2-dichloroethane (1,2-DCA) in accordance with EPA Method 8260 B ' • 3.0. FINDINGS ' The impact of petroleum hydrocarbon constituents to soil vapor samples was quantified by laboratory analytical data, the mass of TPH-g extracted by the SVE system was calculated from the flow rate and laboratory analytical data Ground water elevation, flow direction, and gradient were ' determined from field data collected on 25_May 2005, the contaminant impact to ground water was quantified by analysis of ground water samples ' 3 1 SOIL VAPOR EXTRACTION { ' Between 22 December 2004 and 04 May 2005, the SVE unit operated for approximately 3,192 hours Extraction flow rates ranged from 36 cubic feet per minute (cfm) to.52 cfm SVE system monitoring data is presented in Table 2 1 Hydrocarb6n concentrations detected in influent soil vapor samples were as follows t t ' 18 January, 16 February, 16 March, 13 April, and 04,May 2005 TPH-g, BTEX and MTBE were not detected in the influent vapor sample 1 i ' Advanced CeoEnvironmental,Inc S t