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I <br /> i <br /> IFormer Canteen Facility September 17,2002 <br /> Quarterly Groundwater Monitoring Report Page 2 <br /> I <br /> 0 Sampled and analyzed groundwater for the following parameters <br /> I • total petroleum hydrocarbons, gasoline range (TPHg) (method 8015 modified), <br /> • benzene, toluene, ethylbenzene, and xylenes (BTEX) (method 8021B), and <br /> I • gasoline oxygenates including t-Butanol (TBA), Methyl-t-Butyl Ether (MTBE), Di- <br /> isopropyl Ether (RIPE), Ethyl-t-Butyl Ether (ETBE), t-Amyl Methyl Ether (TAME), <br /> 1,2-dichloroethane(1,2-DCA), and ethylene dibromide (EDB) (method 8260B) <br /> I • Prepared this 2002 Third Quarterly Monitoring Report summarizing the findings of the <br /> quarterly activities <br /> This report presents field observations, results, conclusions and recommendations for additional <br /> p <br /> work, if necessary AES-RS has prepared this report in accordance with generally accepted <br /> environrriental practice <br /> SITE INVESTIGATION & RESULTS <br /> MONITOR WELL SAMPLING <br /> Upon arrival at the Site, the well caps were opened to allow the wells to achieve static <br /> conditions Each well was then gauged to measure groundwater elevations (Table 1) and <br /> selected wells were purged with a submersible Grundfos® pump or disposable bailer until three <br /> casing volumes of groundwater had been recovered Field measurements for conductivity, pH <br /> and temperature were taken during purging to ensure the collection of representative formation <br /> groundwater Groundwater samples were collected from seven monitor wells (MW-3, MW-3A, <br /> MW-3D, MW-11,MW-13, MW-13A, and MW-1313) on August 1, 2002 <br /> IDuring purging of the monitor wells, neither non-aqueous phase liquid (NAPL) nor hydrocarbon <br /> sheen were noted on the purged groundwater Gasoline odors were not detected in any of the <br /> monitor wells sampled <br /> After purging, samples were collected using pre-cleaned disposable bailers and then transferred <br /> I to laboratory provided containers for analysis of TPH(g), BTEX, TBA, MTBE, DIPE, ETBE, <br /> TAME, 1,2-DCA and EDB The samples were transported under chain-of-custody using an <br /> overnight delivery service to McCampbell Analytical, Inc , of Pacheco, California, a California <br /> Iaccredited analytical laboratory <br /> 0 <br /> z" <br /> I gees` <br />