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i II 1 September 2002 • AGE-NC Project No 96-0249 Page 2 of 6 are in Appendix B Purged ground water was containerized in 55-gallon drums and was stored on- site in an area lacking general public access 2 2 GROUND WATER SAMPLING Following well purging, ground water levels from each well achieved a minimum of 80 percent recharge prior to sample collection Ground water samples were collected from the purged wells utilizing new, disposable polyethylene bailers, and transferred to 40-m1 EPA-approved VOA vials containing 0 5 ml 18%hydrochloric acid as a sample preservative and 1-liter amber bottles without 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 23 DOMESTIC WATER WELL SAMPLING A ground water sample was collected from domestic water well DW-I by opening a valve from the lie outlet sample port and allowing the pump to turn on and run for a minimum of 15 minutes,to purge the domestic well prior to sample collection Grab water samples were collected from the purged ' domestic well utilizing 40-m1 EPA-approved VOA vials containing 0 5 ml 18% hydrochloric acid as a sample preservative and I-liter amber bottles without 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 4 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 California Department of Health Services (DHS)-certified laboratory for analysis for ' • Total petroleum hydrocarbons quantified as gasoline and diesel (TPH-g and TPH-d, respectively)by EPA Methods 5030/8015 Modified and 3550/8015 Modified,respectively, ' • Benzene,toluene,ethyl benzene and xylene(BTEX)and methyl-tertiary butyl ether(MTBE) by EPA Method 8020, and • Methanol, ethanol, tertiary butanol (TBA), di-isopropyl ether(DIPE), ethyl tert butyl ether ' (ETBE), tert amyl methyl ether(TAME) and MTBE by EPA Method 8260 Modified • 1 Advanced Geo E nviron mental,Inc I