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ti <br /> 12 February 2002 <br /> • AGE-NC Proj ect No 97-0312 <br /> Page 14 of 18 Y <br /> 4 5 GROUND WATER MONITORING WELL DEVELOPMENT , <br /> Development will consist of a combination of bailing to remove the mayor portion of fine-grained <br /> sediment from Inside the wells, surging to flush out or draw in sediment from the filter pack;and <br /> additional balling to finish the removal of sediment Development activities will be continued until <br /> field parameter(pH, electrical conductivity, and temperature)readings of the purged ground water <br />' have stabilized <br />' 4 6 GROUNDWATER MONITORING AND SAMPLING <br /> Groundwater sample collection will be performed in accordance with pertinent applicable sampling <br /> protocols, details of which are presented below <br /> 4 6 1 Static Water Level Measurements <br /> Before sampling, static water level will be measured in each well using an electric water level <br /> 10 Indicator Water level data will be recorded to the nearest 0 01-foot from a reference point marked <br /> on the top of the PVC well casing Before and after each use,the measurement device will be rinsed <br /> with water <br /> r <br /> 4 6 2 Well Evacuation r <br /> r � <br /> Subsequent to measurement of depth to water and prior to sampling, the well will be purged using <br /> a disposable bailer or a submersible pump to ensure that the sample Is representative of the <br /> r formation,rather than water standing in the well casing The well will be purged until 1)a minimum <br /> of three casing-water volumes of water is removed from the well, and 2)the field-measured ground <br /> water parameters have stabilized However, If a well Is purged dry prior to evacuating three casing <br /> volumes, a ground water sample will be collected following 80 percent recovery of ground water <br /> level within the well or within 2 hours of well evacuati6n ` <br /> h <br /> 4 6 3 ' Sample Withdrawal - <br /> Water samples will be collected from the monitoring well using a disposable polyethylene bailer <br /> These pre-cleanedlbailers are disposed of after one use and require no decontaminating, thereby <br /> minimizing cross contamination due to sampling devices Samples will be drawn and collected in <br /> • such a manner that agitation and exposure of the groundwater to the atmosphere is minimal 'Sample <br /> ti <br /> Advanced CeoEnvironmental,Inc <br /> I ' <br />