ARCHIVED REPORTS_XR0004117 - Laserfiche WebLink

Home Browse Search

i 03 September 2002 AGE-NC Project No 99-0624 Page 2 of 5 stabilization at regular purge-volume intervals from each well using an Oakton water analyzer Field ' data and logs are included with 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 into 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 3 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 5030/8015 Modified, • Benzene,toluene,ethyl benzene and xylene(BTEX)and methyl-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 8260 Modified ' 3.0. FINDINGS ' Ground water elevation, flow direction and gradient were determined from field data collected on 30 May 2002, the contaminant impact to ground water was quantified from the laboratory data ' 3'1 GROUND WATER ELEVATION AND GRADIENT ' During the 30 May 2002 monitoring event, depths to ground water in wells MW-1 through MW-4 • ' Advanced GeoEnvaronmental,Inc 1