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05 March 2004 <br /> AGE-NC Project No 99-0559 <br />' Page 3 of 11 <br />' ball-valve water tip through the top chambers Into the specific water-charged screened section <br /> Approximately 0 25 to 4 gallons of ground water (a minimum of three casing-water volumes per <br /> well), when available, were removed from the multi-Ievel monitoring well levels A, B, C, D and E <br /> During the second- and third-quarter monitoring events, temperature, pH and conductivity were <br />' measured for stabilization at regular purge-volume intervals using an Oakton water analyzer Field <br /> data and logs are included with Appendix A Purged ground water was containerized in 55-gallon <br /> drums and was stored on-site In an area lacking general public access <br /> 22 COLLECTION AND ANALYSIS OF GROUND WATER SAMPLES <br />' Prior toground water sampling, the ground water level <br /> In each well was measured to insure that the <br /> well achieved a minimum of 80 percent recharge Following depth measurement, ground water <br /> samples were collected from wells MW-5A through MW-8E utilizing 318-inch diameter polyethylene <br /> tubing, and from wells MW-1 through MW-4 (second quarter) utilizing disposable polyethylene <br /> bailers The ground water samples were transferred into three 40-m1 EPA-approved volatile organic <br /> analysis (VOA) vials containing 0 5 ml 18% hydrochloric acid as a sample preservative, care was <br /> taken to ensure that visible air bubbles were not present in the vials after filling and capping Ground <br /> water sample containers were properly labeled, placed In a chilled container and transported under <br /> chain-of-custody protocol to CalTech Environmental Laboratories(CTEL),a California Department <br /> ofHealth Services-certified laboratory,for analysis The ground water samples were analyzed for the <br />' following <br /> • Total petroleum hydrocarbons quantified as gasoline (TPH-g) in accordance with EPA <br />' Method 8015 Modified, <br /> 0 Benzene, toluene, ethylbenzene and xylene (BTEX) and the fuel additives tertiary butanol <br /> (TBA), di-isopropyl ether (DIPE), ethyl tert-butyl ether (ETBE), tert-amyl methyl ether <br /> (TAME),methyl tertiary-butyl ether(MTBE),methanol,ethanol,ethyl-dibromide(EDB)and <br /> 1,2-dichloroethane (1,2-DCA) in accordance with EPA Method 8260B <br /> 23 FREE PRODUCT REMOVAL <br /> Free product encountered in well MW-3 during the second-quarter monitoring event and in wells <br /> MW-1 through MW-3 during the third-quarter monitoring event was measured and removed using <br /> a disposable bailer,the removal was performed in a accordance with California Underground Storage <br /> Tank Regulations, Article 5, Section 2655 After removal, the water and free product were stored <br /> on-site In 55-gallon DOT H-17 storage drums <br /> Advanced Geo1♦nvironmental Inc <br />