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0 • <br /> • 26 September 2000 <br /> AGE-NC Project No 96-0263 <br /> Page 10 of 10 <br /> 4 6 1 Static Water Level Measurements <br /> Prior to all ground water purging and sampling, static water levels in each well will be measured <br /> using an electric water level indicator Water level data will be recorded to the nearest 0 01 foot from <br /> a reference point marked on the top of each PVC well casing Before and after each use, the <br /> measurement device will be rinsed with clean tap water <br /> 4 6 2 Well Evacuation <br /> Subsequent to measurement of depth to water and prior to sampling, each well will be purged using <br /> a bailer or submersible pump to ensure that the sample is representative of the surrounding aquifer <br /> ground water The well will be purged until 1)a minimum of three casing volumes is removed from <br /> the well, and/or 2) the field-measured ground water parameters have stabilized However, if the well <br /> is purged dry prior to evacuating three casing volumes, a ground water sample will be collected <br /> following 80 percent recovery of ground water within the well or within 24-hours of well evacuation <br /> • 4 6 3 Sample Withdrawal <br /> Water samples will be collected from each monitoring well using a new, pre-cleaned disposable <br /> polyethylene bailer These bailers are disposed of after one use and require no decontaminating, <br /> thereby minimizing cross contamination due to sampling devices Samples will be drawn and <br /> collected in such a manner that agitation and exposure of the groundwater to the atmosphere is <br /> minimal Sample containers will be filled using the appropriate disposable sampling attachment <br /> which allows controlled flow out of the bottom of the bailer by lifting the check valve <br /> 4 6 4 Sample Handling <br /> Ground water samples will be collected into laboratory-supplied containers Ground water samples <br /> for TPH-g, TPH-d, BTEX and fuel oxygenate (EPA 8260) analyses will be collected into 40-m1 <br /> VOA vials containing 0 5 mI of hydrochloric acid as a sample preservative and into one-liter amber <br /> bottles Following collection the samples will be appropriately labeled and placed on ice and kept <br /> in a cooler until delivered to the laboratory for analysis Chain-of-custody protocols will be used to <br /> document sample custody transfer from the field to the analytical laboratory A chain-of-custody <br /> form will accompany the samples <br /> Advanced GeoEnvuonmentai,Inc <br />