ARCHIVED REPORTS_XR0008438 - Laserfiche WebLink

Home Browse Search

' 25 February 2005 i AGE-NC Project No 95-0104 Page 10 of 10 ' 4 6 2 Well Evacuation Subsequent to measurement of depth to water and prior to sampling,each well will be purged using a bailer or submersible pump to ensure that the sample is representative of the surrounding aquifer ground water The well will be purged until 1)a minimum of three casing volumes is removed from the well,and/or 2)the field-measured ground water parameters have stabilized However,if the well ' is purged dry prior to evacuating three casing volumes, a ground water sample will be collected following 80 percent recovery of ground water within the well or within 24-hours of well evacuation ' 4 6 3 Sample Withdraw Water samples will be collected from the monitoring well using a new, pre-cleaned disposable polyethylene bailer These bailers are disposed of after one use and require no decontaminating, thereby minimizing cross contamination due to sampling devices Samples will be drawn and collected in such a manner that agitation and exposure of the groundwater to the atmosphere is minimal Sample containers will be filled using the appropriate disposable sampling attachment which allows controlled flow out of the bottom of the bailer by lifting the check valve 4 6 4 Sample Handling Ground water samples will be collected into laboratory supplied containers Ground water samples for TPH-g, BTEX and fuel oxygenate(EPA 8260)analyses will be collected Into 40-m1 VOA vials containing 0 5 ml of hydrochloric acid as preservative and Into one-liter amber bottles Following collection the samples will be appropriately labeled and placed on ice and kept in a cooler until delivered to the laboratory for analysis Chain-of-custody protocols will be used to document sample custody transfer from the field to the analytical laboratory A chain-of-custody form will accompany the samples Advanced GeoEnvironmental,Inc