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09 June 2000 <br /> AGE-NC Project No. 98-0407 <br /> Page 8 of,10 <br /> 4.3. WELL DEVELOPMENT <br /> Development will consist of a combination of bailing t remove the major portion of fine-grained <br /> sediment from inside the well, surging to flush out or aw in sediment from the filter pack, and <br /> additional bailing.to finish the removal of sediment. Devi loprrient activities will be continued until <br /> field parameter(pH; electrical conductivity, and temperature) readings have stabilized.' <br /> 4.4. GROUNDWATER SAMPLING PROCEDURE <br /> Groundwater-sample collection will be performed in accoi dance with the PHS-EHD's Recommended <br /> Groundwater Sampling Guidelines; dated 15 February 1995. <br /> 4.4.1. 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 b 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 /> 4.4.2. Well Evacuation <br /> Subsequent to measurerrient of depth to water and prior�o 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.I he 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 groundwater sample will be collected fo110lving 80 percent recovery of ground water <br /> within the well or within 8 hours of well evacuation. <br /> .4.4.3. Sample Withdrawal. <br /> Watersampleswill be collected.from-the monitoring w li using a disposable polyethylene bailer. <br /> These bailers are disposed of after one use and require nodecontaminating;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 attachm nt which allows controlled flow out of the <br /> Advanced GeoEnvironmental,Inc. <br />