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.14 September 1998 " <br /> AGE-NC Project No. 98-046$ <br /> If Page 9 of 10 . <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 thewell-, 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 /> 4:5. 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 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 <br /> from 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 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 disposable bailer to"-ensure.that the sample is representative of the formation, rather than water <br /> standing in the well casing. The well will be purged until: 1) a minimum of three casing volumes is <br /> removed from the well; and 2) the field-measured ground water parameters have -stabilized. <br /> However, a well is purged dry prior to evacuating three casing volumes, a ground water sample will <br /> ` be collected following 80 percent recovery of ground water within,the well or within 8-hours of well <br /> 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 inksucli 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 /> Advanced GeoEovironm.entsl,Inc. <br />