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13 August 2004 <br /> AGE-NC Project No. 95-0167 <br /> Page 8 of 9 <br /> rather than water standing in the well casing. The well will be purged until: 1 ) a minimum of three <br /> casing-water volumes has been removed from the well; and/or 2) the field-measured ground water <br /> parameters, pH, temperature and conductivity have stabilized. However, if a well is purged dryprior <br /> to evacuating three casing volumes, a ground water sample will be collected following 80 percent <br /> recovery of ground water within the well or after a minimum of 1 hour but within 8 hours of well <br /> evacuation. <br /> 3 . 63 . Sample Withdrawal <br /> Water samples will be collected from the monitoring well using a disposable polyethylene bailer or <br /> the dedicated teflon tubing used in conjunction with the inertia pump . The bailers are disposed of <br /> after one use and require no decontaminating and the teflon tubing used with the inertia pump is <br /> either dedicated to each well or changed at each sampling event, thereby minimizing cross <br /> contamination due to sampling devices. Samples will be drawn and collected in such a manner that <br /> agitation and exposure of the ground water to the atmosphere is minimal. <br /> 3 .6.4. Sample Handling <br /> Groundwater samples willbe collectedinto laboratory-supplied 40-ml VOA vials containing 0. 5-m1 <br /> of hydrochloric acid as preservative and one-liter amber glass containers without sample <br /> preservative. Care will be taken to ensure that visible air bubbles are not present in the vials after <br /> filling and capping. Following collection the samples will be appropriatelylabeled, placed on ice and <br /> kept in a cooler until deliveredto aDHS-certified analytical laboratory for analysis. Chain of custody <br /> protocols will be used to document sample custody transfer from the field to the laboratory; a chain <br /> of custody form will accompany the samples. <br /> 3 .7. EQUIPMENT DECONTAMINATION <br /> All sampling tools used for sample collection will be thoroughly rinsed with clean water after being <br /> washed with a solution ofAlconox. All down-hole drilling and sampling equipment will be pressure <br /> washed prior to starting each boring. <br /> I <br /> it <br /> II <br /> Advanced GeoEnvironmental, Inc. <br /> I <br />