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. 07 October 2002 <br /> AGE-NC Project No 01-0827 <br /> Page 6 of 7 <br /> Following completion of the monitoring wells, well elevations and locations will be surveyed by a <br /> California-licensed surveyor <br /> 4 3 WELL DEVELOPMENT AND SURVEY <br /> Development will consist of a combination of bailing to remove the mayor 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 pal ameters (pH, electrical conductivity, and temperature) have stabilized <br /> 4 4 GROUNDWATER SAMPLING PROCEDURES <br /> Ground water sample collection will be performed in accoi dance with the EHD's Recommended <br /> Groundwater Sampling Guidelines, dated 15 February 1995 <br /> • 4 4 1 Static Water Level Measut ements <br /> Before purging and sampling during ground water monitoring events, static water level will be <br /> measured using an electric water level indicator Water level data will be recorded to the nearest 0 01- <br /> foot from a refei ence point marked of the top of the PVC well casing Before and after each use, the <br /> measui ement device will be rinsed with water <br /> 4 4 2 Well Evacuation <br /> Subsequent to measurement of depth to water and prior to sampling, the well will be put ged using <br /> a submersible pump or a disposable bailer to ensui e that the sample is repi esentative of the formation, <br /> rather than water standing in the well casing The well will be purged until 1) a minimum of three <br /> casing-water volumes is removed from the well, and/or 2) the field-measured ground water <br /> parameteis have stabilized However, if a well is purged dry prior to evacuating thiee casing-water <br /> volumes, a ground water sample will be collected following 80 percent recovery of gi ound water <br /> within the well or within 2 hours of well evacuation <br /> 4 4 3 Sample Withdrawal <br /> . Watei 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,theieby minimizing cross <br /> Advanced aoFnvwonmental Inc <br />