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r W <br /> 1 1 a .. " _ _ � _ _418 "- _^,- ...t - a . t ,. r •- n .+ ' ' ! <br /> 1 <br /> f 1 <br /> j 29 August"2001 <br /> i AGE-NC Project No 96-0235 <br /> Page 2 of 5 , <br /> screened interval, ground water was purged from near the top of the water column to remove water <br /> Itrapped within the non-screened interval of the well casings Ground water temperature, pH and% <br /> M conductivity were measured at regular purge-volume intervals using an ICM or Hydac water <br /> analyzer Field'sheets and data are included in Appendix B Purged water was stored on-site in <br /> I labeled, 55-gallon DOT-approved drums <br /> ` <br /> 23 COLLECTION OF GROUND WATER SAMPLES <br />' Water samples were collected from each purged well using new disposable plastic bailers Each <br /> water sample was transferred into 40-ml VOA vials containing 0 5 ml 18% hydrochloric acid as a <br /> sample preservative and ifito 1-liter amber bottles without preservative After collection,the samples <br /> were 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 /> I ' <br /> • Total petroleum hydrocarbons quantified as gasoline (TPH-g) and as diesel (TPH-d) in <br /> . accordance with EPA Methods 5030/8015 and 355018015, respectively, <br /> I • Volatile aromatic hydrocarbons benzene, toluene, ethylbenzene and total xylenes (BTEX) <br /> and methyl tertiary-butyl ether(MTBE) in accordance with EPA Method 60218020, and for <br /> I • Fuel oxygenates - di-isopropyl ether (DIPE), ethyl tertiary-butyl ether (ETBE), MTBE, <br /> tertiary-amyl methyl ether (TAME), tertiary butanol (TBA), methanol, ethanol, ethylene <br /> I dibromide(EDB) and 1,2-dichloroethane(1,2-DCA) in accordance with EPA Method 8260 <br /> Modified <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,Field observations, <br /> results of laboratory analysis of ground water samples and a discussion of data collected during field <br /> work follows <br /> 1 <br /> AND FLOW DIRECTION' <br /> I <br /> 3 1 GROUND WATER GRADIENT. j t <br /> S <br /> The casing elevation of each well was previously surveyed relative to a City of Stockton bench mark <br /> The elevation of ground water in each well was calculated by subtracting the depth to ground water <br /> • from the surveyed casing elevations (Table 1) Depths to ground water ranged from'15 68 feet to <br /> I' Advanced Geo Environmental,Inc <br />