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Canteen Facility November 20, 2000 <br /> Quarterly Groundwater Monitoring Report Page 2 <br /> (USTs) and assess the stability of the groundwater plume The following were conducted during <br /> this quarterly assessment <br /> • Gauged Site monitor wells to evaluate the presence or absence of free product and <br /> measure groundwater elevations <br /> • Purged each Site monitor well by removing a minimum of three well volumes using a <br /> purge pump <br /> • Sampled and analyzed groundwater for total petroleum hydrocarbons, gasoline range <br /> (TPHg), benzene, toluene, ethylbenzene, and xylenes (BTEX) and oxygenated gasoline <br /> additives including t-Butanol (TBA), Methyl-t-Butyl Ether (MTBE), Di-isopropyl Ether <br /> (DIPE), Ethyl-t-Butyl Ether (ETBE), t-Amyl Methyl Ether (TAME), 1,2-dichloroethane <br /> (1,2-DCA) and ethylene dibromide (EDB) <br /> • Prepared this Quarterly Monitoring Report summarizing the findings of the assessment <br /> This report presents field observations, results, conclusions and recommendations for additional <br /> work AES has prepared this report in accordance with generally accepted environmental <br /> practice <br /> SITE INVESTIGATION & RESULTS <br /> The field procedures utilized by Ground Zero during the sampling activities are attached <br /> MONITOR WELL SAMPLING <br /> Upon arrival at the Site, the well caps were opened to allow the wells to achieve static conditions <br /> The wells were then gauged to measure groundwater elevations (Table 1) and purged with a <br /> submersible GrundfosO pump until three casing volumes of groundwater had been recovered <br /> Field measurements for conductivity, pH and temperature were taken during purging to ensure <br /> the collection of formation groundwater Groundwater samples were collected by Ground Zero <br /> from the seventeen monitor wells on September 21 through 25, 2000 <br /> During purging of the monitor wells, neither non-aqueous phase liquid (NAPL) nor hydrocarbon <br /> sheen were noted on the purged groundwater Gasoline odors were detected in monitor wells <br /> MW-13 and MW-13 A(Figure 2) <br /> After purging, samples were collected using pre-cleaned disposable bailers and then transferred to <br /> laboratory provided containers for analysis of TPH(g), BTEX, and oxygenated additives including <br /> TBA, MTBE, DIPE, ETBE, TAME, 1,2-DCA and EDB The samples were transported under <br /> chain-of-custody to Argon Laboratories, Inc , of Ceres, California, a California accredited <br /> analytical laboratory <br />