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23 June 2005 <br /> AGE-NC Project No 98-0432 <br /> Page 2 of 4 <br /> ' 8 5 gallons of water)were removed from monitoring wells MW-I through MW-8 Temperature,pH, <br /> 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 /> ' • • 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 /> ' 3.0. FINDINGS <br /> ' Ground water elevation, flow direction, and gradient were determined from field data collected in <br /> April,the contaminant Impact to ground water was quantified by the ground water sample laboratory <br /> 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 13 35 feet to 14 98 feet - <br /> below the tops of the well casings (Table 1) The ground water elevation at the site ranged from <br /> 22 69 feet (MW-7)to 23 25 feet (MW-6) above mean sea level (MSL), the average ground water <br /> elevation increased approximately 0 9 feet since the previous monitoring event in the first quarter <br /> Advanced GeoEnvironmentsl,Inc <br />