ARCHIVED REPORTS_XR0011429 - Laserfiche WebLink

Home Browse Search

,t 05 December 2002 . AGE-NC Project No. 97-0327 Page 2 of 5 ' regular purge-volume intervals from each well using an Oakton water analyzer. Field data and logs are in Appendix B.Purged ground water was containerized in 55-gallon drums and stored at the site. ' 2.1..2. Ground Water Sampling Following well purging, ground water levels in the monitoring wells were 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, and transferred into one 1-liter ' amber bottle without a preservative and 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. ' 2.1.3. 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; The ground water samples were analyzed for: ' • Total petroleum hydrocarbons quantified as gasoline and diesel (TPH-g and TPH-d, respectively)by EPA Method 5030/8015 and 8015B; ' • Benzene,toluene,ethylbenzene,xylene(BTEX)and methyl-tertiary butyl ether(MTBE)by EPA Method 8020; and ' • Ethylene dibromide (EDB), 1,2-dichloroethane (1,2-DCA), tertiary butanol (TBA), di- isopropyl ether (DIPE), ethyl tort butyl ether(ETBE), tort amyl methyl ether(TAME), and confirmation of MTBE by EPA Method 5030/8260. ' 3.0. FINDINGS Field data was utilized to determine ground water elevation, flow direction and gradient. Petroleum hydrocarbon-impact to ground water was quantified by laboratory analysis. ' Advanced CcoEnvironmental,Inc.