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i <br /> i <br />' 22 July 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 /> I2 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 /> • Fuel additives-di-isopropyl ether(DIPE),ethyl tertiary-butyl ether(ETBE),MTBE,tertiary- <br /> amyl methyl ether(TAME), tertiary butanol (TBA), methanol, ethanol, 1,2-dibromoethane <br /> (EDB) and 1,2-dichloro ethane (1,2-DCA) 1n accordance with EPA Method 8260B <br /> I <br /> 23 PURGE WATER DISPOSAL <br />' On 05 June 2002, approximately 250 gallons of non-hazardous purge water was pumped from _ <br /> on-site_55-gallon drums The purge water had_been_generated dunng previous ground water <br /> monitoring events Pumping and disposal was completed by American Valley Waste 011, Inc of ' <br />' Delhi, California A copy of the waste disposal manifest is included in Appendix C <br />' 3.4. 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 /> I <br /> Advanced GeoEnvironmental,Inc <br /> f <br />