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21 August 2000 <br /> • AGE-NC Protect No 97-0343 <br /> Page 7 of 7 <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 ofwell evacuation <br /> lie 4 6 3 Sample Withdrawal <br /> I Water samples will be collected from the 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 appropnate disposable sampling attachment <br /> which allows controlled flow out of the bottom of the bailer by lifting the check valve <br /> I <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 ml of hydrochloric acid as preservative and into one-liter amber bottles <br /> Following collection the samples will be appropriately labeled and placed on ice and kept in a cooler <br /> until delivered to the laboratory for analysis Cham-of-custody protocols will be used to document <br />' sample custody transfer from the field to the analytical laboratory A chain-of-custody form will <br /> accompany the samples <br /> 1 <br />' Advanced GeoEnviron mental,Inc <br /> 1 <br />