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05 November 2002 <br /> AGE-NC Project No. 96-0235 <br /> Page 2 of 5 <br /> the intermediate- and deep-screened wells,ground water was purged from near the top of the water <br /> column to remove water trapped within the non-screened interval of the well casings. Ground water <br /> �. temperature,pH and conductivity were measured at regular purge-volume intervals using an Oakton <br /> water analyzer. Field sheets and data are included in Appendix A. Purged water was stored on-site <br /> in labeled, 55-gallon DOT-approved drums. <br /> �.. 2.2. COLLECTION AND ANALYSIS OF GROUND WATER SAMPLES <br /> Water samples were collected from each purged well using new disposable plastic bailers after <br /> •• allowing the wells to achieve a minimum 80%recovery of the pre-purge water volume. Each water <br /> sample was transferred into 40-m1 VOA vials containing 0.5 ml 18%hydrochloric acid as a sample <br /> preservative and into 1-liter amber bottles without preservative. After collection, the samples were <br /> �- properly labeled, placed in a chilled container and transported under chain-of-custody to <br /> McCampbell Analytical, Inc. (MAI), a State of California Department of Health Services (DHS)- <br /> certified analytical laboratory, and were analyzed for: <br /> • Total petroleum hydrocarbons quantified as gasoline (TPH-g) and as diesel (TPH-d) in <br /> accordance with EPA Method 8015 modified; <br /> • Benzene, toluene, ethylbenzene and total xylenes (BTEX) and methyl tertiary-butyl ether <br /> (MTBE) in accordance with EPA Method 8021; and <br /> • The fuel additives di-isopropyl ether (DIPE), ethyl tertiary-butyl ether (ETBE), MTBE, <br /> tertiary-amyl methyl ether (TAME), tertiary butanol (TBA), methanol, ethanol, <br /> 1,2-dibromoethane (EDB) and 1,2-dichloroethane (1,2-DCA) in accordance with EPA <br /> Method 8260B. <br /> 2.3. PURGE WATER DISPOSAL <br /> On 13 September 2002,approximately 200 gallons of non-hazardous purge water was pumped from <br /> on-site 55-gallon drums. The purge water had been generated during previous ground water <br /> .r monitoring events. Pumping and disposal was completed by American Valley Waste Oil, Inc. of <br /> Delhi, California. A copy of the waste disposal manifest is included in Appendix C. <br /> 3.0. FINDINGS <br /> Ground water elevation and flow direction were inferred from field data; hydrocarbon-impact to <br /> ground water was quantified by laboratory analysis of the ground water samples. <br /> +,. Advanced GeoE nvi ron mental,Inc. <br /> r.. <br />