Laserfiche WebLink
03 June 2005 <br /> • AGE-NC Project No 98-0432 <br /> Page 2 of 4 <br /> ' 7 75 gallons of water) were removed from monitoring wells MW-1 through MW-8 Temperature, <br /> pH,and conductivity of the purged water were measured at regular purge-volume intervals using an <br /> Oakton water analyzer Monitoring well field logs are Included in Appendix A Purge water <br /> generated from the monitoring wells was contained on-site in appropriately labeled 55-gallon drums <br /> ' 2'2 COLLECTION AND ANALYSIS OF GROUND WATER SAMPLES <br /> Ground water samples were collected from the monitoring wells using the disposable polyethylene <br /> bailers, these bailers are disposed of after one use and require no decontamination, thereby <br /> minimizing cross-contamination from sampling devices Each water sample was transferred Into <br /> three 40-milliliter (ml) EPA-approved volatile organic analysis (VOA) vials containing 0 5 ml <br /> ' 18%hydrochloric acid solution as a sample preservative, and into one 1-liter amber bottle without <br /> preservative After collection, the samples were labeled and placed in a chilled container for <br /> transportation under chain of custody to Cal Tech Environmental Laboratories(CTEL),a California <br /> Department of Health Services (DHS)-certified analytical laboratory located in Paramount, <br /> California Each sample was analyzed for <br /> 10- • Total petroleum hydrocarbons quantified as gasoline and diesel (TPH-g and TPH-d, <br /> respectively) in accordance with EPA Method 8015 Modified, and <br /> ' • Benzene,toluene,ethylbenzene,and total xylenes(BTEX)and fuel additive compounds di- <br /> isopropyl ether (DIPE), ethyl tertiary-butyl ether (ETBE), methyl tertiary-butyl ether <br /> (MTBE), tertiary-amyl methyl ether (TAME), tertiary butanol (TBA), 1,2-dichloroethane <br /> ' (1,2-DCA), and 1,2-dibromoethane (EDB), In accordance with EPA Method 8260B <br /> ' r <br /> 3.0. FINDINGS <br /> ' Ground water elevation, flow direction, and gradient were determined from field data collected in <br /> January, the contaminant Impact to ground water was quantified by the ground water sample <br /> laboratory analytical data <br /> 1 <br /> 3 1 GROUND WATER ELEVATION, FLOW DIRECTION AND GRADIENT <br />' The depth to ground water measured in the monitoring wells ranged from <br /> 14 12 feet to 15 97 feet <br /> below the tops of the well casings (Table 1) The ground water elevation at the site ranged from <br />' 21 55 feet (MW-7) to 22 44 feet (MW-3 and MW-5) above mean sea level (MSL), the average <br /> ground water elevation increased approximately 2 8 feet from the fourth quarter 2004 monitoring <br /> 1 J <br /> Advanced GeoEnvironmental,Inc <br />