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' 15 September 2005 AGE-NC Project No 96-0229 ' Page 2 of 6 ' On 21 and 22 June 2005,approximately four to eleven gallons of ground water(a minimum of three casing-water volumes per well)were evacuated(purged)from wells MW-2 through MW-12 utilizing disposable bailers Approximately eight gallons were removed from well MW-1 before the well was ' purged dry Temperature, pH, and conductivity were measured for stabilization at regular purge- volume intervals from each well using an Oakton water analyzer Field data and logs are included in Appendix A Purged ground water was containerized in 55-gallon drums and stored on-site in an ' area lacking general public access Approximately 0 30 to 3 25 gallons of ground water(a minimum of three casing-water volumes per ' well) were purged from multi-level wells MW-13 (A-D), MW-14 (A-D), MW-15 (A-D), MW-16 (A-E), MW-17 (A-C), MW-18 (A-E) and MW-19 (A-C) Each well was purged by lowering and raising a 3/a-inch outer diameter, length-discrete polyethylene hose equipped with a ball-valve water tip through the top chambers into the specific water-charged screened section A Waterra Hydro- Lift 11 pump equipped with a mechanical arm was utilized to surge each well with a polyethylene hose Temperature, pH, and conductivity were measured for stabilization at regular purge-volume ' intervals from each well using an Oakton water analyzer Field data and logs are included in Appendix A Purged groundwater was containerized in 5 5-gallon drums and stored on-site in an area lacking general public access 2 1 1 Ground Water Sampling ' Followingwellpurging, the round water level from each well was allowed to achieve a minimum g ' of 80% recharge prior to sample collection Ground water samples were transferred into 40-milliliter (ml) EPA-approved volatile organic analysis (VOA) vials containing 0 5 ml 18% hydrochloric acid solution as a sample preservative Care was taken to ensure that visible air bubbles ' were not present in the vials after filling and capping Ground water sample containers were labeled with the well designation, date, time, and sampler's initials ' 2 12 Laboratory Analysis Of Ground Water Samples Each ground water sample was logged on a chain of custody form,placed in a chilled container,and transported to a Calitomia Department of Health Services (DHS)-certified laboratory for analysis for • Total petroleum hydrocarbons quantified as gasoline (TPH-g) by EPA Method SW5030/8015M, 0 Benzene, toluene, ethylbenzene, and xylenes (BTEX) by EPA Method 8260B, and ' Advanced GeoEnvironmental,Inc- 1