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31 March 2000 AGE-NC Project No. 00-0699 Page 8 of 9 through tremmie pipe. The PHS-EHD will be notified for grout inspection at least 48-hours prior to conducting grouting procedures. Following completion of the monitoring wells, well elevations and locations will be surveyed by a California-licensed surveyor. 4.4. WELL DEVELOPMENT 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 the purged water is essentially sediment free. 4.5. GROUND WATER MONITORING WELL SAMPLING Ground water sample collection will be performed in accordance with PHS-EHD sampling protocols. 4.5.1. Static Water Level Measurements Before sampling and during groundwater monitoring,the static water level will be measured using an electric water level indicator. Water level data will be recorded to the nearest 0.01 foot from a reference point marked of the top of the PVC well casing. Before and after each _use, the measurement device will be rinsed with water. 4.5.2. Well Evacuation _ Subsequent to measurement of depth to water and prior to sampling, the well will be purged-using a submersible pump or a disposable bailer 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 volumes is removed from the well; and/or 2) the field-measured ground water parameters have stabilized. However, if a well is purged dry prior to evacuating three casing 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. Advanced GeoEnvironmental,Inc.