Laserfiche WebLink
23 May 2001 <br /> AGE-NC Project No. 99-0592 <br /> Page 6 of 8 <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 <br /> Development will consist of a combination of bailing and/or pumping to remove the major portion <br /> of fine-grained sediment from inside the well,surging to flush out or draw in sediment from the filter <br /> pack, and the utilization of a submersible pump to finish the removal of sediment. Development <br /> activities will be continued until field parameter (pH, electrical conductivity, and temperature) <br /> readings have stabilized. <br /> 4.4. GROUND WATER SAMPLING PROCEDURES <br /> Ground water sample collection will be performed in accordance with pertinent applicable sampling <br /> protocols, details.of which are presented below. <br /> 4.4.1. Static Water Level Measurements <br /> Before sampling and during ground water monitoring, static water level will be measured using an <br /> electric water level indicator. Water level data will be recorded to the nearest 0.01 foot from the <br /> surveyed reference point marked of the top of the PVC well casing. Before and after each use, the <br /> measurement device will be washed and rinsed with a solution of Alconox and water. <br /> 4.4.2. Well Evacuation <br /> Subsequent to measurement of depth to water and prior to sampling, the well will be purged using <br /> a submersible pump or a disposable bailer to ensure that the sample is representative of the <br /> formation,rather than water standing in the well casing. The well will be purged until: 1) a minimum <br /> of three casing volumes is removed from the well; and/or 2) the field-measured ground water <br /> 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 /> within the well or within 8-hours of well evacuation. <br /> Advanced GeoEnvironment4 Inc. <br />