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Former Canteen Facility April 7,2003 <br /> Quarterly Groundwater Monitoring Report Page 2 <br /> • Sampled and analyzed groundwater for the following parameters <br />' • total petroleum hydrocarbons, gasoline range(TPHg) (method 8015 modified), <br /> • benzene, toluene, ethylbenzene, and xylenes (BTEX) (method 8021B), and <br /> • 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 /> I1,2-dichloroethane (1,2-DCA), and ethylene dibromide(EDB) (method 8260B) <br /> • Prepared this 2003 First Quarterly Monitoring Report summarizing the findings of the <br />' quarterly activities <br /> This report presents field observations, results, conclusions and recommendations for additional <br />' work, if necessary AES-RS has prepared this report in accordance with generally accepted <br /> environmental 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 pleasure groundwater elevations (Table 1) and <br />' selected wells were purged with a Waterra® pump or disposable bailer until three casing <br /> volumes of groundwater had been recovered Field measurements for conductivity, pH and <br />' 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-13B) on August 1, 2002 <br />' During purging of the monitor wells, neither non-aqueous phase liquid (NAPL) nor hydrocarbon <br /> sheen were noted on the purged groundwater A gasoline odor was detected in monitor well <br />' MW-13 <br /> After purging, samples were collected using pre-cleaned disposable bailers and then transferred <br />' 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 />' accredited analytical laboratory <br />' REcu��r <br /> 0 <br />