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15 April 2003 <br /> • AGE-NC Project No 95-0109 <br />' Page 2 of 5 <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 A The purged water was containerized in 55-gallon <br />' DOT-approved drums and stored on-site <br /> 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 Afterwards,water samples were collected from <br /> wells MW-7 and MW-15 using a new,disposable plastic bailer and from the remaining wells using <br /> a Watera Hydrohft Pump Immediately upon retrieval,the samples were transferred into 40-m1 EPA- <br /> approved VOA vials containing 0 5ml 18%hydrochloric acid as a sample preservative The samples <br /> were labeled, stored on ice, and transported in a chilled container, under chain-of-custody, to <br /> McCampbell Analytical, Inc (MAI), a State of California Department of Health Services-certified <br />' analytical 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 />' 8021, and <br /> • Fuel additives di-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 <br /> 3.0. FINDINGS <br /> Ground water elevation and flow direction were inferred from the field data The hydrocarbon- <br /> impact to ground water was quantified by laboratory analysis of the ground water samples <br /> 3 1 GROUND WATER GRADIENT AND DIRECTION <br /> IThe depth to ground water ranged from 54 27 feet to 57 49 feet below the tops of the well casings <br /> Ground water elevations at the site ranged from 1 01 feet below mean sea level(MSL)in well MW-5 <br /> to 3 71 feet below MSL in well MW-17, ground water elevations increased an average of 0 97 feet <br /> between the December 2002 and March 2003 sampling events Ground water levels were within the <br /> 2 Advanced Geo Environmental,Ine <br />