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<br />' Former Canteen Facility January 13,2005
<br /> QuarteLly Groundwater Monitoring Report Page 2
<br />' • Purged Site monitor wells MW-1, MW-2, MW-3, MW-3A, MW-3D, MW-4, MW-5, MW-
<br /> 7 through MW-12, MW-13A and MW-13B by removing a minimum of three well volumes
<br /> using a WaterraO inertia pump or disposable bailer MW-13 was dry during this sampling
<br /> event
<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) and gasoline oxygenates
<br /> including t-Butanol (TBA), Methyl-t-Butyl Ether (MTBE), Di-isopropyl Ether(D1PE),
<br /> Ethyl-t-Butyl Ether (ETBE), t-Amyl Methyl Ether (TAME), 1,2-dichloroethane (1,2-
<br /> DCA), and ethylene dibromide(EDB)(method 826013)
<br /> • Preparation of this 2004 Fourth Quarterly Monitoring Report summarizing the findings of
<br /> the quarterly activities
<br /> This report presents field observations, results, conclusions and recommendations for additional
<br /> work, if necessary In addition, a review of the on-site systems operation and maintenance is
<br /> presented Delta has prepared this report in accordance with generally accepted environmental
<br /> Ipractice
<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 Waters® 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 /> I groundwater Groundwater samples were collected from 16 monitor wells (MW-1, MW-2, MW-
<br /> 3, MW-3A, MW-3D, MW-4, MW-5, MW-7 through MW-12, MW-13A and MW-13B) on
<br /> November 11, 2004 MW-13 was dry dunng this sampling event
<br /> During purging of the monitor wells, neither non-aqueous phase liquid (NAPL) nor hydrocarbon
<br /> sheen were noted on the purged groundwater A slight hydrocarbon odor was noted in monitor
<br /> wells MW-3D and MW-13A
<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 Columbia Analytical Services, Inc , of Phoenix, Arizona, a
<br /> ICalifornia accredited analytical laboratory
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