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� r — ' 15 July 2005 AGE-NC Project No 00-0769 Page 2 of 7 r e i A Solinst water level meter was used to measure the depth to water in all the wells to the nearest ' 0 01-foot,relative to the tops of the well casings(Table 1) Between 6and 11 gallons of ground water (a minimum of three casing-water volumes per well) were evacuated (purged) from single-level ' wells MW-1, MW-213,and MW-313 and between 38 and 45 gallons were purged from deep,single- level wells MW-2A`and MW-3A, utilizing disposable polyethylene bailers or a Waterra inertial pump equipped with%-inch diameter polyethylene tubing and a check valve Multi-level monitoring wells MW-4 through MW-9 were purged utilizing the Waterra inertial pump equipped with 3/e-inch } diameter polyethylene tubing and a check valve Approximately 0 45 to 5 5 gallons of ground water (a minimum of three casing-water volumes per well)were purged from the multi-level monitoring ' wells Temperature,pH,and conductivity were measured at regular purge-volume intervals from each well ' ' using an Oakton water analyzer Field logs are provided in Appendix B Purged water was temporarily stored on-site in properly labeled, Department of Transportation (DOT)-approved 55-gallon drums pending proper disposal 1 , • 22 COLLECTION AND ANALYSIS OF GROUND WATER SAMPLES Ground water samples were collected,from wells MW-2B and MW-313 utilizing new, 2-inch 1 diameter disposable polyethylene bailers Samples were collected from wells MWA, MW-2A, MW-313, and MW-4A through MW-913 utilizing a Waterra inertia pump and 3/e-inch diameter polyethylene tubing The samples were transferred into three, 40-milliliter EPA-approved volatile 1 organic analysis (VOA) vials containing 0 5 ml 18% hydrochloric acid solution as a preservative Care was taken to ensure that visible air bubbles were not present in the vials after filling and capping The sample vials were labeled with the monitoring well designation,date,time of sampling, and the sampler's initials Following collection, samples were placed in a°chilled container and transported under chain of custody to Cal,Tech Environmental Laboratories (CTEL), a California Department of Health Services (DHS)-certified analytical laboratory, for analysis Samples were analyzed for the following constituents • Total petroleum hydrocarbons quantified as gasoline (TPH-g) in accordance with EPA ` Method 8015 Modified, and I I - • Benzene, toluene, ethylbenzene, and total xylenes (BTEX) and the fuel additives methyl ' tertiary-butyl ether (MTBE), di-isopropyl ether (DIPE), ethyl tertiary-butyl ether (ETBE), tertiary-amyl methyl ether(TAME),tertiary-butyl alcohol(TBA), 1,2-dibromoethane(EDB), 1,2-dichloroethane (1,2-DCA), ethanol, and methanol in accordance with EPA Method ' 8260B 5 ' Advanced GeoEnvironmental,Inc r j