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10 October 1999 <br /> AGE-NC Project No. 99-0559 <br /> Page 8 of 8 <br /> parameters have stabilized. However, if a well is purged dry prior to evacuating three casing <br /> volumes, a ground water sample will be collected following 80 percent recovery of ground water <br /> within the well or within 8-hours of well evacuation. <br /> 4.5.3. Sample Withdrawal <br /> Water samples will be collected from the monitoring well using a disposable polyethylene bailer. <br /> These bailers are disposed of after one use and require no decontaminating,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. Sample containers will be <br /> filled using the appropriate disposable sampling attachment which allows controlled flow out of the <br /> bottom of the bailer by lifting up on the check valve. <br /> 4.5.4. Sample Handling <br /> Ground water samples will be collected into laboratory supplied containers. Ground water sarnples <br /> _ for TPH-g, BTEX and fuel oxygenates analyses will be collected into 40-m1 VOA vials containing <br /> 0.5 ml hydrochloric acid as preservative. Ground water samples for TPH-d analyses will be collected <br /> into 1-liter glass ambers. Following collection the samples will be placed on ice and kept in a cooler <br /> until delivered to the laboratory for analysis. Chain-of-custody forms will be used to document <br /> sample custody transfer from the field to the analytical laboratory, and accompany the samples. <br /> 4.6. EQUIPMENT DECONTAMINATION <br /> All sampling tools used for sample collection will be thoroughly washed with a solution of Alconox <br /> and rinsed with clean water prior to use at each sampling location. Hollow-stem augers will be <br /> steam-cleaned prior to advancing each pilot boring. <br /> 4.7. BORING ABANDONMENT <br /> All soil borings not completed as monitoring wells will be permanently sealed to prevent vertical <br /> migration of potential contaminants. Soil borings shall be abandoned by backfilling with bentonite <br /> or cement-bentonite slurry-from the total depth to surface grade. The PHS-EHD will be notified for <br /> grout inspection at least 48 hours prior to grout emplacement. <br /> Advanced GcoEn irnnmcnial.Inc. <br />