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17 July 2002 <br /> S AGE-NC Project No. 97-0327 <br />' Page 5 of 10 <br /> After water levels were measured, approximately 8 gallons of ground water (a minimum of three <br /> casing water-volumes per well)were evacuated (purged) from wells MW-1 through MW-4 utilizing <br /> a Watera hydro-lift pump. Temperature, pH and conductivity were measured for stabilization at <br /> regular purge-volume intervals from each well using an Oakton water analyzer. Field data and logs <br />' are in Appendix E. Purged ground water was containerized in 55-gallon drums and stored at the site. <br /> 2.7.2. Ground Water Sampling <br /> Following well purging, ground water levels in the monitoring wells were allowed to achieve a <br /> minimum of 80 percent recharge prior to sample collection. Ground water samples were collected <br /> from the purged wells utilizing new, disposable polyethylene bailers, and transferred into one 1-liter <br />' amber bottle without a preservative and 40-m1 EPA-approved VOA vials containing 0.5 ml 18% <br /> hydrochloric acid as a sample preservative. Care was taken to ensure that visible air bubbles were <br /> not present in the vials after filling and capping. Ground water sample containers were labeled with <br />' the well designation, date, time, and sampler's initials. <br /> 2.7.3. Laboratory Analysis of Ground Water Samples <br /> Each ground water sample was logged on a chain-of-custody form, placed in a chilled container and <br /> transported to a DHS-certified laboratory for analysis for: <br /> • TPH-g and TPH y EPA Methods 8015M/5030 and LUFT/EPA Method 8015B; <br /> • BTEX and MTBE by EPA Method 8020; <br /> • Methanol, ethanol,EDB, 1,2-DCA, TBA,DIPE, ETBE, TAME and MTBE by EPA Method <br /> 8260M. <br /> 3.0. FINDINGS <br /> ' Soil descriptions were utilized to construct geologic cross sections of the site; field data was utilized <br /> to select soil samples for laboratory analysis and determine ground water elevation, flow direction <br /> and gradient. Petroleum hydrocarbon-impact to soil and ground water was assessed and quantified <br /> bylaboratory analysis. <br />' Advanced GeoEnvironmental,Inc. <br />