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24 March 2000 <br /> AGE-NC Project No 97-0141 <br /> Page 8 of 9 <br /> measurement device will be nnsed with water <br /> 4 5 2 Well Evacuation <br /> Subsequent to measurement of depth to water and prior to sampling, the well will be purged using <br /> a submersible pump or a disposable bailer to ensure that the sample is representative of the <br /> formation,rather than water standing in the well casing The well will be purged until 1)a minimum <br /> of three casing volumes is removed from the well, and/or 2) the field-measured ground water <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 groundwater 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 samples <br /> for BTEX, TPH-g, and fuel oxygenates analyses well be collected into 40-m1 VOA vials containing <br /> 0 5 ml of hydrochloric acid as preservative Samples for TPH-d analysis will be collected into 1-liter <br /> amber glass containers without a preservative Following collection, the samples will be placed on <br /> ice and kept in a cooler until delivered to the laboratory for analysis Chain-of-custody protocols will <br /> be used to document sample custody transfer from the field to the analytical laboratory A chain-of- <br /> custody form will accompany the samples <br /> 4 b 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 each sampling location All probing rods will be cleaned prior <br /> Advanced GeoEnvtronmental,Inc <br />