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<br /> Former Canteen Facility April 14,2004
<br /> Quarterly Groundwater Monitoring Report Page 2
<br /> • Purged Site monitor wells MW-3, MW-3A, MW-3D, MW-11, MW-13, MW-13A, and
<br /> MW-13B by removing a minimum of three well volumes using a Waterra® inertia pump or
<br /> disposable bailer
<br /> • 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 (DIPE), Ethyl-t-Butyl Ether (ETBE), t-Amyl Methyl Ether (TAME),
<br /> 1,2-dichloroethane(1,2-DCA), and ethylene dibromide(EDB) (method 826013)
<br /> I • Prepared this 2004 First Quarterly Monitoring Report summarizing the findings of the
<br /> quarterly activities
<br /> IThis report presents field observations, results, conclusions and recommendations for additional
<br /> work, if necessary AES has prepared this report to accordance with generally accepted
<br /> environmental practice
<br /> ISITE INVESTIGATION & RESULTS
<br /> MONITOR WELL SAMPLING
<br /> IUpon 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 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-1313) on February 24, 2004
<br /> IDuring 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 wells
<br /> MW-3D and MW-13
<br /> I Afterur in were collected using disposable bailers and then transferred.
<br /> p g g, samples p gpre-cleaned
<br /> I to laboratory provided containers for analysts 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 Columbia Analytical Services, Inc , of Phoenix, Arizona, a
<br /> ICalifornia accredited analytical laboratory
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