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31 August 2000 <br /> AGE-NC Project No 00-0725 <br /> Page 8 of 9 <br /> 45 GROUNDWATER SAMPLING PROCEDURES <br /> Groundwater sample collection will be performed in accordance with pertinent applicable sampling <br /> protocols, details of which are presented below <br /> 4 5 1 Static Water Level Measurements <br /> Before sampling and during groundwater monitoring, static water level will be measured using an <br /> electric water level indicator Water level data will be recorded to the nearest 0 01 foot from a <br /> reference point marked of the top of the PVC well casing Before and after each use, the <br /> measurement device will be rinsed with water <br /> 4 5 2 Well Evacuation <br /> Subsequent to measurement of depth to water and prior to sampling, the well will be purged using <br /> • a submersible pump or a disposable bailer to ensure thatthe sample is representative of the formation, <br /> rather than water standing in the well casing The well will be purged until 1) a minimum of three <br /> casing volumes is removed from the well,and/or 2)the field-measured ground water parameters have <br /> stabilized However, if a well is purged dry prior to evacuating three casing volumes,a ground water <br /> sample will be collected following 80 percent recovery of ground water within the well or within 8- <br /> hours of well evacuation <br /> 4 5 3 Sample Withdrawal <br /> Water samples will be collected from the monitoring well using a disposable polyethylene bailer <br /> These bailers are disposed of after one use and require no decontaminating, therefore minimizing <br /> cross contamination due to sampling devices Samples will be drawn and collected in such a manner <br /> that agitation and exposure of the groundwater to the atmosphere is minimal 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 up on the check valve <br /> 4 5 4 Sample Handling <br /> Ground water samples will be collected into laboratory-supplied containers Ground water samples <br /> for BTEX, TPH-g and fuel oxygenates analyses will be collected into 40-m1 VOA vials containing <br /> . 0 5 ml ofhydrochloric acid as preservative Following collection the samples will be placed on ice and <br /> kept in a cooler until delivered to the laboratory for analysis Chain-of-custody protocols will be used <br /> to document sample custody transfer from the field to the analytical laboratory A chain-of-custody <br /> form will accompany the samples <br /> Advancers GeoEnvironmental,Inc <br />