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30 September 2003 <br /> AGE-NC Project No 95-0130 <br /> Page 2 of 6 <br /> After water levels were measured, approximately 3/4 to 183/4 gallons of ground water(a minimum of <br /> three casing-water volumes per well)were purged from wells MW-1 through MW-7 by lowering and <br /> raising a 318-inch outer diameter,length-discrete polyethylene hose equipped with a ball-valve water <br /> tip through the specific water-charged screened section A Watera-Hydro-Lift II pump equipped with <br /> a mechanical arm was utilized to surge the polyethylene hose Temperature, pH and conductivity <br /> were measured for stabilization at regular purge-volume intervals from each well using the Oakton <br /> water analyzer Field data and logs are in Appendix A Multi-level well purged ground water was <br /> transferred to 55-gallon drums and stored on-site in an area lacking general public access <br /> 2 2 GROUND WATER SAMPLING <br />' Ground water samples were collected from purged wells MW-1 through MW-7 utilizing 318-inch <br /> diameter polyethylene tubing Ground water samples were transferred into 40-m1 EPA-approved <br /> volatile organic analysis (VOA) vials containing 0 5 ml 18% hydrochloric acid as a sample <br />' preservative Care was taken to ensure that visible air bubbles were not present in the vials after <br /> filling and capping Ground water sample containers were labeled with the well designation, date, <br /> time, and sampler's initials <br /> 2 3 LABORATORY ANALYSIS OF GROUND WATER SAMPLES <br />' Each ground water sample was logged on a chain-of-custody form,placed in a chilled container and <br /> transported to a California Department of Health Services (DHS)-certified laboratory for analysis <br /> for <br /> • Total petroleum hydrocarbons quantified as gasoline(TPH-g)by EPA Methods 5030/8015 <br />' Modified, <br /> • Benzene, toluene, ethylbenzene and xylene (BTE&X) and methyl-tertiary butyl ether <br />' (MTBE)by EPA Method 8020, and <br /> • 1,2-Dichloroethane (1,2-DCA), ethylene dibromide (EBD), tertiary butanol (TBA), di- <br /> isopropyl ether (DIPE), ethyl tert butyl ether(ETBE), tert amyl methyl ether (TAME) and <br />' MTBE by EPA Method 8260 Modified <br /> 3.0. FINDINGS <br />' Ground water elevation, flow direction and gradient were determined from field data collected on <br /> . 04 June 2003 The contaminant impact to ground water was quantified by laboratory analysis of <br /> water samples <br /> rAdvanced GeoEnvironmental,Inc <br />