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• 21 September 1998 <br /> AGE-NC Project No 97-0290 <br /> Page 7of8 <br /> Califomxa-licensed surveyor <br /> 3 7 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 or produced <br /> water appears to be sediment-free <br /> 3 8 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 />. 3 8 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 /> 3 8 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 or submersible pump to ensure that the sample is representative of the formation, <br /> rather than water standing in the well casing The well will be purged until a minimum of three <br /> casing volumes is removed from the well, and the field-measured ground water parameters have <br /> stabilized, or the well is purged dry If a well is purged dry prior to evacuating three casing volumes, <br /> a ground water sample will be collected following 80 percent recovery of ground water within the <br /> well or within 8-hours of well evacuation <br /> 3 8 3 Sample Withdrawal <br /> Water samples will be collected from the monitoring well using a disposable polyethylene bailer <br /> .advanced GeoEnvironmental,Inc <br />