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26 November 2001 AGE-NC Project No. 98-0492 - Page 6of7 4.3. WELL DEVELOPMENT'AND SURVEY Development will consist of a combination of bailing to remove the major portion of fine-grained sediment from inside.the well, surging to flush.out or draw in sediment from the filter pack, and . additional'bailing to finish the removal of sediment.Development activities will be continued until 'field parameter(pH,electrical conductivity;and tempera e)readings have stabilized:Additionally,. each.well-head elevation will be surveyed by a licensed(surveyor. 4:4. GROUNDWATER SAMPLING PROCEDURES Ground water' sample collection -will be, performe in accordance with the. PHS-EHD's. Recommended Groundwater Sampling Guidelines;date 15 February 1995. 4.4.1. Static Water Level Measurements Before.-purging and sampling during ground'water-mo itoring events,. static water level will be measured using an electric water level indicator. Wates level data will be recorded to.the,nearest .0.01 bot from a reference point marked of the top of the. VC well casing.Before and after each use, the measurement device will be rinsed with water. 4.4.2. Well Evacuation Subsequent to measurement of depth to water and prior to sampling, the well'will be purged using a submersible pump or a disposablebailer to ensure that'the sample is representative of the formation,rather than water standing in the well casing.The well will be purged until:1)a minimum of three casing-water volumes is removed from the well; d/or 2)the field-measured-groun.dwate.r parameters have stabilized. However;if a well is purged'ry prior to evacuating three casing-water - volumes, a ground water sample will be collected following 80 percent-recovery of ground water within the well or within 8 hours of well evacuation. 4.4.3. Sample Withdrawal r Water samples will be collected froTh the monitoring W- 611 using a disposable polyethylene bailer. These bailers are disposed of after one use and require no decontaminating,thereby minimizing cross contamination due to sampling devices. Samples will be drawn and collected in-such a manner that agitation and exposure of the groundwater to the atmosphere is minimal.-Sample containers will be Advanced GeoEnvironmental,Inc.