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17 July 2001 <br /> AGE-NC Project No. 97-0327 <br /> Page 7 of 7 <br /> However, if the well is purged dry prior to evacuating three casing volumes, a ground water sample <br /> will be collected following 80 percent recovery of ground water within the well or within 1 hour of <br /> well evacuation. <br /> 3.6.3. Sample Withdrawal <br /> Water samples will be collected from the monitoring well using a new, pre-cleaned disposable <br /> polyethylene bailer. These bailers are disposed of after one use and require no decontaminating, <br /> thereby minimizing cross contamination due to sampling devices. Samples will be drawn and <br /> collected in such a manner that agitation and exposure of the ground water to the atmosphere is <br /> minimal. Sample containers will be filled using the appropriate disposable sampling attachment <br /> which allows controlled flow out of the bottom of the bailer by lifting the check valve. <br /> 3.6.4. Sample Handling <br /> Ground water samples will be collected into laboratory supplied containers. Ground water samples <br /> for TPH-g, TPH-d, BTEX and fuel oxygenate (EPA 8260) analyses will be collected into 40-m1 <br /> VOA vials containing 0.5 ml hydrochloric acid as a sample preservative and into one-liter amber <br /> bottles. Following collection the samples will be appropriately labeled and placed on ice and kept <br /> in a cooler until delivered to the Iaboratory for analysis. Chain-of-custody protocols will be used to <br /> document sample custody transfer from the field to the analytical laboratory. A chain-of-custody <br /> form will accompany the samples. <br /> Advatued GeoEnvironmental.Inc. <br />