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05 July 2000 <br /> • AGE-NC Project No 00-0696 <br /> EPages 8 of 9 <br /> 4 4 GROUNDWATER SAMPLING PROCEDURES <br /> Groundwater sample collection will be performed an accordance with the PHS-EHD's Recommended <br /> Groundwater Sampling Guidelines, dated 15 February 1995 <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 /> I <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 that the sample is representative of the <br /> formation,rather than water standing in the well casing The well will be purged until 1) a minimum <br /> of three casing volumes is removed from the well, and/or 2) the field-measured ground water <br /> parameters have stabilized However, if a well is purged dry prior to evacuating three casing <br /> volumes, a ground water sample will be collected following 80 percent recovery of ground water <br /> within the well or within 8 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,thereby minimizing cross <br /> contamination due to sampling devices Samples will be drawn and collected in such a manner that <br /> agitation and exposure of the groundwater to the atmosphere is minimal Sample containers will be <br /> filled using the appropriate disposable sampling attachment which allows controlled flow out of the <br /> 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 of hydrochloric acid as preservative Samples for TPH-d analysis will be collected into 1-later <br /> Advanced GeoEnvironmental,Inc <br /> I <br />