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1 ' 16 January 2003 AGE-NC Project No. 98-0450 ' Page 3 of 8 ' 2.2.1. Well Monitoring and Evacuation A Solinst water level meter was used to measure the depth to ground water in the monitoring wells ' relative to the tops of the well casings; the ground water elevations and gradient were determined from this data (Table 1). Subsequently, ground water elevations were plotted and contoured on a scaled site map (Figure 3). ' After water levels were measured, approximately 36 gallons (a minimum of three casing-water volumes per well)of water were purged from wells BMW-1 and BMW-2 and approximately 1.5 to 1 10 gallons of water were purged from the remaining wells with dedicated, disposal bailers; well BMW-4 was bailed dry after 1.5 gallons of water were removed. ' An Oakton water analyzer was utilized to monitor temperature,pH and conductivity of purged water at regular purge-volume intervals. Stabilization data and field logs are included in Appendix A. Purged ground water was containerized in 55-gallon drums and stored on-site. 1 2.2.2. Ground Water Sample Collection 1 The ground water levels in all six wells were allowed to recharged to a minimum of 80% of the ' initial well volume prior to sample collection. Subsequently, ground water samples were collected from each well using anew disposable plastic bailer and transferred into three 40-ml volatile organic analysis (VOA) vials containing 0.5 ml 1 S% HCl as a sample preservative and a one-liter amber ' bottle without preservative. The samples were then labeled and placed in a chilled container for transport under chain-of-custody to MAI. The samples were analyzed for: ' • TPH-g and TPH-d in accordance with EPA Method 8015 Modified; • BTEX and MTBE in accordance with EPA Method 8021B; and ' • DIPE, ETBE, MTBE, TAME and TBA in accordance with EPA Method 8260B. ' 2.3. SOIL-VAPOR EXTRACTION Between June and December 2002,SVE remediation was in continual operation at the site,utilizing ' an active vacuum blower system to apply an induced vacuum to wells VW-1 through VW-1,1-during this time,IAS remediation also continued,with air sparging through wells IAS-1 through IAS-9.The ' SVE system consisted of two-inch diameter, schedule 40 PVC piping installed underground from each well-head at wells VW-1 through VW-11 and connected to the inlet of the vacuum blower. The IAS system consisted of one-inch diameter, schedule 40 PVC piping installed underground from ' Advanced Geo Enviro n mental,Inc. 1 i