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23 February 2000 <br /> AGE-NC Project No 98-0533 <br /> Page 7 of 8 <br /> 4 4 1 Static Water Level Measurements <br /> Before sampling and during quarterly groundwater monitoring, static water level 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 of the top of the PVC well casing Before and after each use, the <br /> measurement device will be rinsed with a solution of tap water and Alconox <br /> 4 4 2 Well Evacuation <br /> Subsequent to measurement of depth to water and prior to sampling, the well will be purged using <br /> a two-stage submersible pump to ensure that the sample is representative of the formation, rather <br /> than water standing in the well casing The well will be purged until 1) a minimum of three casing <br /> volumes is removed from the well, and 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 4 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 4 4 Sample Handling <br /> Ground water samples will be collected into laboratory supplied containers Ground water samples ` <br /> for TPH-av, BTEX, and fuel oxygenate analyses will be collected into 40-m1 VOA vials containing <br /> 0 5-ml of hydrochloric acid as preservative Following collection the samples will be placed on ice <br /> and kept in a cooler until delivered to the laboratory for analysis Chain-of-custody protocols will <br /> be used to document sample custody transfer from the field to the analytical laboratory A chain-of- <br /> custody form will accompany the samples <br /> Advanced GeoEnvironmental,Inc <br />