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1 - <br /> 26 May 2004 <br /> AGE-NC Project No 96-0229 <br />' Page 2 of 6 r <br />' Approximately 1'/4 to 3% gallons of ground water (a minimum of three casing-water volumes per <br /> well)were purged from multi-level wells MW-13 and MW-14 Each well was purged by lowering <br /> and raising a 3/a-inch outer diameter, length-discrete polyethylene hose equipped with a ball-valve <br />' water tip through the top chambers into the specific water-charged screened section A Watera- <br /> Hydro-Lift II pump equipped with a mechanical arm was utilized to surge each well with a <br /> polyethylene hose Temperature, pH and conductivity were measured for stabilization at regular <br />' purge-volume intervals from each well using an Oakton water analyzer Field data and logs are <br /> included with Appendix A Purged ground water was containerized in 55-gallon drums and was <br /> stored on-site in an area lacking general public access <br /> I <br /> 2 1 1 Ground Water Sampling <br />' Following well purging, the ground water level from each well was allowed to achieve a minimum <br /> of 80 percent recharge prior to sample collection, except for well MW-2 which was purged `dry' <br />' Ground water samples were collected from the purged wells utilizing new, disposable polyethylene <br /> bailers,and transferred to 40-m1 EPA-approved volatile organic analysis(VOA)vials containing 0 5 <br /> lieml 18%hydrochloric acid as a sample preservative Care was taken to ensure that visible air bubbles <br /> were not present in the vials after filling and capping Ground water sample containers were labeled <br /> with the well designation, date, time, and sampler's initials <br /> 2 1 2 Laboratory Analysis Of Ground Water Samples <br /> IEach ground water sample was logged on a chain-of-custody form,placed in a chilled container and <br /> transported to a California DHS-certified laboratory for analysis for <br /> • Total petroleum hydrocarbons quantified as gasoline (TPH-g) by EPA Method <br /> SW5030B/8015Cm, <br /> • Benzene, toluene, ethylbenzene, xylenes (BTEX) by EPA Method 8021 B, and <br /> • Ethylene dibromide (EDB), 1,2-dichloroethane (1,2-DCA), tert-butyl alcohol (TBA), di- <br /> isopropyl ether (DIPE), ethyl tert butyl ether (ETBE), tert amyl methyl ether (TAME) and <br /> methyl tert buyl ether (MTBE) by EPA Method 8260B <br /> 3.0. FINDINGS - <br /> Ground water monitoring field data was utilized to determine ground water flow direction and <br /> gradient on 25 August 2003, hydrocarbon impact to ground water was quantified by laboratory <br /> analysis of samples collected on 25 August 2003 <br /> IAdvanced GeoEnvironmental,Inc <br /> I <br />