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13 November 2000 <br /> AGE-NC Project No. 98-0481 <br /> Page 9of10 <br /> 4.4. WELL DEVELOPMENT <br /> Development will consist of a combination of bailing to remove the major portion of fine-grained <br /> sediment from inside the well, surging to flush out or draw in sediment from the filter pack, and <br /> additional bailing to finish the removal of sediment. Development activities will be continued until <br /> field parameter(pH, electrical conductivity, and temperature)readings have stabilized. <br /> r <br /> 4.5. GROUNDWATER SAMPLING PROCEDURES <br /> Groundwater sample collection will be performed in accordance with applicable sampling protocols, <br /> specified by the PHS-EHD, 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 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,pH,temperature and conductivity have stabilized.However, if a well is purged dry prior <br /> to evacuating three casing volumes, a ground water sample will be collected following 80 percent <br /> recovery of ground water 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 ground water to the atmosphere is minimal. Sample containers will be <br /> u <br /> Advanced GeoEnvironmental,Inc. <br />