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10 August 2001 <br /> AGE-NC Project No 97-0341 <br /> Page 2 of 5 <br /> two-stage submersible pump or a disposable polyethylene bailer Temperature,pH and conductivity <br /> ' were measured for stabilization at regular purge-volume intervals from each well using an Oakton <br /> water analyzer Field data and logs are in Appendix B Purged ground water was contamenzed in <br /> 55-gallon drums and was stored on-site in an area lacking general public access <br /> 2 2 GROUND WATER SAMPLING <br /> ' Following well purging, ground water levels in the monitoring wells were allowed to achieve a <br /> minimum of 80 percent recharge prior to sample collection Ground water samples were collected <br /> ' from the purged wells utilizing new, disposable polyethylene bailers The water was than transferred <br /> into one 1-liter amber bottle without a preservative and four 40-m1 EPA-approved VOA vials <br /> containing 0 5 ml IS%hydrochloric acid as a preservative Care was taken to ensure that visible air <br /> ' bubbles were not present in the vials after filling and capping Ground water sample containers were <br /> labeled with the well designation, date, 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, diesel and kerosene (TPH-g, TPH-d, <br /> ' and TPH-k, respectively)by EPA Methods 8015M/5030 and 8015M/3550, respectively, <br /> • Volatile aromatic compounds - benzene, toluene, ethyl benzene and xylene (BTEX) with <br /> ' methyl-tertiary butyl ether(MTBE)by EPA Method 8020, <br /> • Fuel oxygenated compounds - tertiary butanol (TBA), di-isopropyl ether(DIPE), ethyl tert <br /> butyl ether(ETBE), tert amyl methyl ether(TAME), methanol, ethanol and MTBE by EPA <br /> 1 Method 8260M <br /> • Ethylene dibromide (EDB) and 1,2-dichloroethane (1,2-DCA) by EPA Method 8260M <br /> ' 3.0. FINDINGS <br /> I <br /> Ground water elevation, flow direction and gradient were determined from field data collected on <br /> ' 27 June 2001, the contaminant impact to ground water was assessed from the ground water <br /> laboratory data <br /> Advanced GeoEnviron mental,Inc <br />