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i I09 July 2001 i AGE-NC Protect No 97-0249 IPage 2 of 6 site in an area lacking general public access 2 2 GROUND WATER MONITORING WELL SAMPLING Following well purging, ground water levels in monitoring wells MW-1 through MW-6 were I allowed to achieve a minimum of 80 percent recharge prior to sample collection Ground water samples were collected from the purged wells utilizing new, disposable polyethylene bailers, one 1-liter amber bottle without a sample preservative and three 40-m1 EPA-approved VOA vials I containing 0 5 ml 18% hydrochloric acid as 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 23 DOMESTIC WATER WELL SAMPLING Ground water sample collection from domestic water wells located at Rock 's Restaurant W-1 P Y {� ) • and Three B's Truck Plaza (DW-1) were achieved by opening a valve from the outlet sample port and allowing the pump to turn on and run for a minimum of 15 minutes to purge the domestic water wells prior to sample collection Grab water samples were collected from the purged domestic water wells utilizing one 1-liter amber bottle without a sample preservative and three 40-m1 EPA-approved VOA vials containing 0 5 ml 18% hydrochloric acid as 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, • Volatile aromatic compounds - benzene, toluene, ethyl benzene and xylene (BTEX) with methyl-tertiary butyl ether(MTBE) by EPA Method 8020, and • Fuel oxygenated compounds - 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 IAdvanced GeoEnvironmental,Inc