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. h <br /> • 13 September 1999 <br /> AGE-NC Project No 96-0232 ' <br /> Page 2 of 5 ' <br />' Approximately 5 gallons of ground water were removed from well MW-613 before being pumped <br /> "dry" Temperature, pH and conductivity were measured for stabilization at reguia; purge-volume <br /> intervals from each well using an ICM Model 52200,water analyzer Field data and logs are in <br /> Appendix A Purged ground water was containerized in 55-gallon drums and was stored on-site in <br /> an area lacking general public access <br /> I <br /> 1 , <br /> 2 2 GROUND WATER SAMPLING <br /> rFollowing well purging activities, ground water levels in monitoring wells MW-1, MSV-2, MW-4, <br /> - MW-5, MW-6A, MW-6B and MW-7 were allowed to achieve a minimum of 80 percent recharge <br /> prior to,collection of ground water samples Ground water samples were collected from all purged <br /> wells utilizing new, disposable polyethylene bailers, one-liter amber bottles and 40-m1 EPA- <br /> approved VOA vials containing 0 5 ml preservative, a gfab ground water sample was collected at <br /> the faucet of the domestic water well utilizing 40-m1 EPA-approved VOA vials containing 0 5 mI <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 dec�gnation, date, <br />' lime, and sampler's initials <br /> 2 3 LABORATORY ANALYSIS OF GROUND WATER SAMPLES <br /> f <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 Iaboratory for analysis <br /> foi <br /> • Total petroleum hydrocarbons quantified as gasoline and diesel (TPH-g and'TPH-d <br /> respectively) by EPA Method 8015M, <br /> I • Volatile aromatic compounds benzene, toluene ethyl benzene and xylenes (BTEX) with <br /> methyl-tertiary butyl ether (MTBE) EPA Method 8020, and ' <br />`' • Tertiary butanol (TBA), di-isopropyl ether (DIPS) ethyl tert butyl ether (ETBE), tent amyl <br /> methyl ether (TAME) and MTBE by EPA Method 8260-Modified <br /> { <br /> 30 FINDINGS, <br /> • From the field data, AGE was able to determine the ground water flow direction and gradient <br /> Laboratory analysis of seven ground water samples detected total petroleum hydroc,Arbons in three <br /> I <br /> 4di anced GroFnN ironmental,InC <br /> ti r <br />