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I27 September 2004 . AGE-NC Project No 96-0263 Page 2 of 5 ' on Figure 2 2 1 2 Ozone Distribution System Installation On 06 and 07 March 2004,the ozone distribution system was Installed at the site A network of 1/2- inch diameter, PVC tubing was Installed in 2-Inch diameter PVC conduit In a series of trenches approximately 4-Inches wide and 12-inches deep Ozone distribution lines were routed underground from each IOS well head to the solenoid control valve on the ozone generator A plan of the distribution system and ozone generator location is depicted on Figure 2 2 2 WELL MONITORING AND EVACUATION On 27 March 2004, a Solinst water level meter was used to measure the depth to ground water in wells MW-1 through MW-11 relative to the tops of the well casings The ground water elevations and gradient were determined from these measurements (Table 1) rAfter recording water level measurements,disposable plastic bailers were used to purge wells MW-1 through MW-1 I of standing water Approximately 6 0 to 6 25 gallons of water (a minimum of 3 casing-water volumes per well) were removed from wells MW-1, MW-3, MW-5, MW-7, MW-9, MW-10 and MW-11 and approximately 13 0 gallons of water were removed from MW-6 Approximately 2 gallons of water were removed from wells MW-2, MW-4 and MW-8 before the I wells were balled dry Ground water temperature, pH and conductivity were measured at regular Intervals during purging using an Oakton water analyzer Field sheets and data are included in Appendix B Purged water was stored on-site in labeled, 55-gallon DOT-approved drums 23 COLLECTION AND ANALYSIS OF GROUND WATER SAMPLES IWater samples were collected from the purged wells using new disposable plastic bailers after allowing the wells to achieve a minimum 80%recovery of the pre-purge water volume Each water I sample was transferred into three 40-m1 volatile organic analysis(VOA)vials containing 0 5 ml 18% hydrochloric acid as a sample preservative After collection, the samples were properly labeled, placed in a chilled container and transported under chain-of-custody to Cal Tech Environmental Laboratories (CTEL), a State of California Department of Health Services (DHS)-certified analytical laboratory The samples were analyzed for Advanced GeoEnvi ron mental,Inc I