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• <br /> 28 June 1999 <br /> AGE-NC Project No 97-0333 <br /> Page 9 of 9 <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 /> mimmum of three casing volumes is removed from the well, and for 2)the field-measured ground <br /> water 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 4 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 4 4 Sainplc H&ndlin <br /> g <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-ml 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 5 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'A'111 be pressure- <br /> washed prior to starting the boring <br /> t <br /> Afi anced GeoFm ironmental Inc <br />