ARCHIVED REPORTS_XR0005029 - Laserfiche WebLink

Home Browse Search

I ' 08 March 2004 • AGE-NC Project No 98-0432 ' Page 2 of 4 Temperature, pH and conductivity of the purged water were measured at regular purge-volume intervals with an Oakton water analyzer Monitoring well field logs are included in Appendix Amo JYVV y�� Purge water generated from the site monitoring wells was contained on-site in appropriately labeled ' 55-gallon drums ' 22 COLLECTION AND ANALYSIS OF GROUND WATER SAMPLES Ground water samples were collected from the monitoring wells using the disposable polyethylene ' bailers, these bailers were disposed of after one use and require no decontaminating, thereby minimizing cross contamination due to sampling devices Each water sample was transferred into three 40-m1 EPA-approved volatile organic analysis (VOA) vials containing 0 5 ml 18% HCl as a ' sample preservative and into one 1-liter amber bottle without preservative After collection, the samples were labeled and placed in a chilled container for transportation under chain-of-custody to Cal Tech Environmental Laboratory(CTEL), a California Department of Health Services (DHS)- certified analytical laboratory located in Paramount, California Each sample was analyzed for • Total petroleum hydrocarbons quantified as gasoline and diesel (TPH-g and TPH-d) in ' . accordance with EPA Method 8015 Modified, • Benzene, toluene, ethylbenzene and total xylenes (BTEX) and fuel additive compounds, ' including di-isopropyl ether(DIPE),ethyl-tertiary-butyl ether(ETBE),methyl-tertiary-butyl ether (MTBE), tertiary-amyl methyl ether (TAME), and tertiary-butanol (TBA), 1,2- dichloroethane (1,2-DCA), ethyl dibromide (EDB)eA 1,2-dibromoethane) in accordance ' with EPA Method 8260B ' 3 0. FINDINGS ' Ground water elevation, flow direction and gradient were determined from field data collected in February 2004,the contaminant impact to ground water was quantified by the ground water sample laboratory analytical data 3 1 GROUND WATER ELEVATION, FLOW DIRECTION AND GRADIENT ' The depth to ground water measured in the monitoring wells ranged from 17 11 to 18 83 feet below the top of the well casing (btoc) (Table 1) The ground water elevations at the site ranged from ' 18 q1 feet (MW-7) to 19 46 feet (MW-3) above mean sea level (MSL), the average ground water elevation decreased 2 feet since the previous monitoring event in July 2003 �� 1 Advanced GeoEnvlronmental,Inc