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08 December 2005 AGE-NC Project No. 01-0828 Page 8 of 9 s 4.4.1. Static Water Level Measurements i LW Before purging and sampling during ground water monitoring events, static water level will be measured using an electric water level indicator. Water level data will be recorded to the nearest IL 0.01-foot from a reference point marked of the top of the PVC well casing.Before and after each use, the electric oil/water level indicator will be washed in an Alconox solution and rinsed with water. i . L { 4.4.2. Well Evacuation After measuring the depth to ground water and prior to sampling, the well will be purged using a submersible pump to ensure that the ground water sample is representative of the formation,rather than water standing in the well casing.The well will be purged until: 1) a minimum of three casing volumes is removed from the well, arid/or 2) the field-measured ground water parameters pH, temperature, and electrical conductivity have stabilized. However, if a well is purged dry prior to yevacuating three casing volumes, a ground water sample will be collected following 80 percent recovery of ground water level within the well, or within 8 hours of well evacuation. Purge water, free-product,and decontamination water generated during the ground water sampling ' activities will be contained in Department of Transportation (DOT)-approved 55-gallon drums, s which will be appropriately labeled for storage.Drums containing purge water will be stored on-site pending appropriate removal and disposal. r 4.4.3. Sample Withdrawal f Water samples will be collected from the monitoring wells using a disposable polyethylene bailer v, or dedicated teflon tubing used in conjunction with an inertia pump.The bailers are disposed of after one use and require no decontamination, and the teflon tubing used with the inertia pump is either dedicated to each well or changed at each sampling event,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 are minimal. 4.4.4. Sample Handling i Ground water samples will be collected into laboratory-supplied containers. Ground water samples to be analyzed for TPH-g,TPH-d,BTEX,and fuel additives will be collected into 40-milliliter(ml) volatile organic analysis(VOA)vials containing 0.5 ml 18%hydrochloric acid solution as a sample V° preservative; ground water samples to be analyzed for TPH-d will be collected into 1-liter amber. �, Advanced GeoEnvironmental,Inc.