ARCHIVED REPORTS_XR0010127 - Laserfiche WebLink

Home Browse Search

i ' Former Canteen Facility October 15, 2004 . Quarterly Groundwater Monitoring Re ort Page 2 • Purged Site monitor wells MW-3, MW-3A, MW-3D, MW-11, MW-13A, and MW-13B by removing a minimum of three well volumes using a Waterra® inertia pump or disposable bailer MW-13 was dry during this sampling event • Sampled and analyzed groundwater for the following parameters I • total petroleum hydrocarbons, gasoline range (TPHg) (method 8015 modified), • benzene, toluene, ethylbenzene, and xylenes (BTEX) (method 8021B), and ' • gasoline oxygenates including t-Butanol (TBA), Methyl-t-Butyl Ether (MTBE), Di- isopropyl Ether (D1PE), Ethyl-t-Butyl Ether (ETBE), t-Amyl Methyl Ether (TAME), ' 1,2-dichloroethane (1,2-DCA), and ethylene dibromide(EDB) (method 8260B) • Preparation of this 2004 Third Quarterly Monitoring Report summarizing the findings of ' the quarterly activities This report presents field observations, results, conclusions and recommendations for additional ' work, if necessary In addition, a review of the on-site systems operation and maintenance is presented Delta has prepared this report in accordance with generally accepted environmental practice ' SITE INVESTIGATION & RESULTS ' MONITOR WELL SAMPLING Upon arrival at the Site, the well caps were opened to allow the wells to achieve static ' conditions Each well was then gauged to measure groundwater elevations (Table 1) and selected wells were purged with a Waterra© pump or disposable bailer until three casing volumes of groundwater had been recovered Field measurements for conductivity, pH and ' temperature were taken during purging to ensure the collection of representative formation groundwater Groundwater samples were collected from six monitor wells (MW-3, MW-3A, MW-3D, MW-11, MW-13A, and MW-13B) on August 16, 2004 MW-13 was dry during this ' sampling event ' During purging of the monitor wells, neither non-aqueous phase liquid (NAPL) nor hydrocarbon sheen were noted on the purged groundwater A gasoline odor was detected in monitor well MW-3 ' After purging, samples were collected using pre-cleaned disposable bailers and then transferred to laboratory provided containers for analysis of TPH(g), BTEX, TBA, MTBE, DIPE, ETBE, TAME, 1,2-DCA and EDB The samples were transported under chain-of-custody using an overnight delivery service to Columbia Analytical Services, Inc , of Phoenix, Arizona, a California accredited analytical laboratory