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t 4 08 October 1999 AGE-NC Project No 96-0229 ' Page 2 of 6 ' with Appendix A Purged ground water was containerized in 55-gallon drums and was stored on-site in an area lacking general public access I ' 2 2 GROUND WATER SAMPLING Following well purging, ground water levels in monitoring wells MW-I through MW-10 achieved a minimum of 80 percent recharge pnor to sample collection Ground water samples were collected I from the purged wells utilizing new, disposable polyethylene bailers and three 40-m1 EPA-approved VOA vials contaimng 0 5 ml 18%hydrochloric acid as a preservative Care was taken to ensure that visible air bubbles were not present in the vials after filling and capping Ground water sample Icontainers 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 G Total petroleum hydrocarbons quantified as gasoline (TPH-g) by EPA Method 8015M, 9 Volatile aromatic compounds (benzene, toluene, ethyl benzene and xylene BTEX) with Imethyl-tertiary butyl ether(MTBE) by EPA Method 8020, and • Tertiary butanol (TBA), di-isopropyl ether (DIPE), 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 28 July 1999 Laboratory analysis of eleven ground water samples detected TPH-g In four ground water samples, BTEX compounds were detected In six ground water samples, fuel oxygenated compounds were detected In five ground water samples 3 1 RELATIVE GROUND WATER ELEVATION AND GRADIENT During the July 1999 monitoring event, depths to ground water from wells MW-1 through MW-10 Advanced GeoEnrironmental,Inc