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• 30 April 2005 AGE-NC Project No 00-0769 ' Page 2 of 7 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 Sand 11 gallons of ground water (a minimum of three casing-water volumes per well) were evacuated (purged) from single-level ! wells MW-1,MW-2B,and MW-3B,and between 36 and 44 gallons were purged from deep, single- level wells MW-2A and MW-3A, utilizing disposable polyethylene bailers or a Waterra inertial pump equipped with 5/8-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 3/8-inch diameter polyethylene tubing and a check valve Approximately 0 12 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 2 2 COLLECTION AND ANALYSIS OF GROUND WATER SAMPLES Ground water samples were collected from wells MW-2B and MW-3B utilizing new, 2-inch ' diameter disposable polyethylene bailers Samples were collected from wells MW-1, MW-2A, MW-3B, and MW-4A through MW-9D utilizing a Waterra inertia pump and 3/8-inch diameter polyethylene tubing The samples were transferred into three, 40-milliliter EPA-approved volatile ' 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 * 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), r 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 ' Advanced GeoEnvironmentai,Inc 1