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t ' I 08 November 1999 AGE-NC Project No 98-0448 Page 2 of 4 water was containerized in 55-gallon drums and was stored on-site in ` ' Appendix A Purged ground a , an area lacking general public access , ' 2 2 GROUND WATER SAMPLING ' Following well purging, ground water levels in monitoring wells MW-1 through MW-8 achieved a minimum of 80 percent recharge prior to sample collection Ground water samples were d 40collected ers and three EPA-app ml frothe purged wells utilizing new, disposable polyethylene bail ' 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 23 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 (TPH-g) by EPA Method 8015M, • Volatile aromatic compounds (benzene, toluene, ethyl benzene and Xylene BTEX) with �I methyl-tertiary butyl ether (MTBE) by EPA Method 8020 • Tertiary butanol (TBA), di-isopropyl ether (DIPS), ethyl tert butyl ether (ETBE), tert amyl methyl ether (TAME) and,MTBE by EPA Method 8260M 3.0. FINDINGS AGE determined ground water flow direction and gradient from the field data collected on 10 s September 1999 Laboratory analysis of eight ground water samples detected TPH-g in five samples,' BTEX in four samples, MTBE in three samples and DIPE in two samples 33 GROUND WATER ELEVATION AND GRADIENT I The g depths to round water in wells MW-1 through MW-8 were measured between 17 60 and 19 89 p Advanced GeoEnvironmental,Inc