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20 January 2003 <br /> AGE-NC Project No 95-0109 <br /> Page 4 of 8 <br /> wells MW-15 through MW-19 were purged during well development(Section 2 1 4 )using a Watera <br /> Hydrollft Pump <br /> Between 6 and 7 gallons of water(a minimum of 3 casing-water volumes per well)were purged from <br /> wells MW-6 through MW-14 and approximately 80 gallons removed from EW-1,monitoring wells <br /> MW 15 through MW 19 were evacuated during development as described in section 2 1 4 <br /> Between 0 3 and 0 5 gallons of water were purged from wells MW-1 through MW-3 and MW-5 <br /> before the wells were purged dry, well MW-4 could not be purged at all and was dust sampled <br /> Temperature, pH and conductivity of the purge water were measured at regular purge-volume <br /> intervals using an Oakton water analyzer and the readings were recorded on field logs Field data and <br /> work sheets are included in Appendix B The purged water was contamenzed in 55-gallon <br /> DOT-approved drums and stored on-site <br /> 2 2 2 Collection and Analysis of Ground Water Samples <br /> The depth to water was re-measured after purging to ensure a minimum of 80 per cent recharge of <br /> the Initial water level in each well prior to sampling, wells MW-1 through MW-5 did not achieve <br /> the 80 per cent recharge after a 2- to 3-hour wait <br /> Afterwards, water samples were collected from each purged well using a new, disposable plastic <br /> bailer Immediately upon retrieval, the samples were transferred into 40-m1 EPA-approved VOA <br /> vials containing 0 5ml 18%hydrochloric acid as a sample preservative The samples were labeled, <br /> stored on ice, and transported in a chilled container, under chain-of-custody, to McCampbell <br /> Analytical, Inc (MAI), a State of California Department of Health Services-certified analytical <br /> laboratory The ground water samples were analyzed for <br /> • Total petroleum hydrocarbons quantified as gasoline (TPH-g) in accordance with EPA <br /> Methods 5030/8015M, <br /> • Benzene, toluene, ethylbenzene and xylenes (BTEX) in accordance with EPA method <br /> 8260B, <br /> • Fuel additives dl-Isopropyl ether(DIPE), ethyl tertiary-butyl ether(ETBE),methyl tertiary- <br /> butyl ether (MTBE), tertiary-amyl methyl ether (TAME), tertiary butanol (TBA), <br /> 1,2-dichloroethane (1,2-DCA) and ethylene dibromide (EDB) in accordance with EPA <br /> Method 8260B, and <br /> • Volatile organic compounds by full-scan EPA method 8260B <br /> Advanced GeoEnvironrnental,Inc <br />