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<br /> Former Canteen Facility January 20,2003
<br /> Quarterly Groundwater Momtonng Le ort Page 2
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<br /> dry On December 30 the remaining ten wells (MW-1,MW-2,MW-4,MW-5,MW-6,MW-
<br /> 7, MW-8, MW-9, MW-10 and MW-12) were purged, by removing a minimum of three
<br />' well volumes using a submersible purge pump or disposable bailer
<br /> I • 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), D1-
<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 8260B)
<br /> • Prepared this 2002 Fourth Quarterly Monitoring Report surnmanzmg 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 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 removed 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 October 31, 2002 On December 30,
<br />' 2002 groundwater samples were collected from the 10 remaining wells, (MW-1, MW-2, MW-4,
<br /> MW-5, MW-6,MW-7,MW-8,MW-9,MW-10 and MW-12)
<br />' During purging of the monitor wells, neither non-aqueous phase liquid (NAPL) nor hydrocarbon
<br /> sheen were noted on the purged groundwater A faint gasoline odor was detected in monitor well
<br />' MW-3
<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, DME, ETBE,
<br /> SrGuz,�o
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