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08 July 1999 <br /> AGE-NC Project No. 95-0130 <br /> Page 10 of 10 <br /> a bailer or submersible pump to ensure that the sample is representative of surrounding aquifer <br /> ground water, rather than standing water in the well casing. The well will be purged until: 1) a <br /> minimum of three casing volumes is removed from the well; and 2)the field-measured ground water <br /> parameters have stabilized. However, if the 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 pre-cleaned bailers are disposed of after one use and require no decontaminating, thereby <br /> minimizing cross contamination due to sampling devices. Samples will be drawn and collected in <br /> such a manner that agitation and exposure of the groundwater to the atmosphere is minimal. Sample <br /> containers will be filled using the appropriate disposable sampling attachment which allows <br /> controlled flow out of the bottom of the bailer by lifting the check valve. <br /> 4.5.4. Sample Handling <br /> Ground water samples will be collected into laboratory supplied containers. Ground water samples <br /> for TPH-g,BTEX and fuel oxygenate(EPA 8260)analyses will be collected into 40-m1 VOA vials <br /> containing 0.5-m1 of hydrochloric acid as preservative. Following collection, the samples will be <br /> appropriately labeled and placed on ice and kept in a cooler until delivered to the laboratory for <br /> analysis.Chain-of-custody protocols will be used to document sample custody transfer from the field <br /> to the analytical laboratory. A chain-of-custody form will accompany the samples. <br /> 4.6. EQUIPMENT DECONTAMINATION <br /> All sampling tools used for sample collection will be thoroughly rinsed with clean water after being <br /> washed with a solution of Alconox.All down-hole drilling and sampling equipment will be pressure- <br /> washed prior to starting the boring. <br /> Advanced GcoEnviromnental,Inc. <br />