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7 <br /> j r <br /> ' t <br /> . 14 September 2001 <br /> AGE-NC Project No 95-0109 <br /> Page 9 of 9 <br /> of three casing-water volumes has been removed from the well,and/or 2)the field-measured ground <br /> water parameters have stabilized However, if a well is purged dry prior to evacuating three casing- <br /> water volumes, a ground water sample will be collected following 80 percent recovery of ground <br /> water within the well or within 1 hour of well evacuation <br /> I4 6 3 Sample Withdrawal <br /> Water samples will be collected from the monitoring well using a disposable polyethylene bailer <br /> IThese 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 minimized Sample containers will <br />' be filled using the appropriate disposable sampling attachment which allows controlled flow out of <br /> the bottom of the bailer by lifting the check valve <br /> 464 Sample Handling <br /> • Ground water samples will be collected into laboratory-supplied containers Ground water samples <br /> for TPH-g, BTEX, fuel additives and volatile organic analysis will be collected Into 40-m1 <br /> I EPA-approved VOA vials containing 0 5 ml HCl as a sample preservative Following collection,the <br /> samples will be labeled 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 /> I4 7 EQUIPMENT DECONTAMINATION <br /> 5 <br /> All sampling tools used for sample collection will be thoroughly washed with a solution of Alconox <br /> and rinsed with clean water pnor to each sampling location All probing rods will be cleaned prior <br /> to advancement at each probe boring location Hollow-stem augers will be steam-cleaned prior to <br /> each boring <br /> I ` <br /> 5 <br /> 4 8 BORING ABANDONMENT <br /> All soil borings not completed as monitoring wells, if any, will be permanently sealed to prevent <br /> vertical migration of potential contaminants Soil borings'shall be abandoned by backfilling with <br /> bentonite or cement-bentonite slurry from the total depth to surface grade The PHS-EHD will be <br /> • notified for grout inspection at least 48 hours prior to conducting grouting procedures <br /> Advanced GeoEnviroumental,Inc <br />