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18 December 2001 <br />' AGE-NC Project No 01-0839 <br /> Page 7 of 8 <br /> 4 4 2 Well Evacuation <br />' <br /> Subsequent to measurement q emen 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-water 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-water <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 /> I <br /> 4 4 3 Sample Withdrawal <br /> Water samples will be collected from the monitoring well using a disposable polyethylene bailer <br /> These bai lers 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 /> I4 4 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 will be collected into 40-aril VOA vials containing <br /> 0 5 ml of hydrochloric acid as preservative Following collection, the samples will be appropriately <br /> I labeled and placed on ice and kept in a cooler until delivered to the laboratory for analysis Chain-of- <br /> custody protocols will be used to document sample custody transfer from the field to the analytical <br /> laboratory A chain-of-custody form will accompany the samples <br /> I <br /> 4 5 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 Hollow-stem augers will be steam- <br /> cleaned prior to each boring <br /> I <br /> Advanced GeoEn"ronmental,Inc <br /> I <br />