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File No. 20-3978-01.WR9 <br /> • ji KLEINFELDER <br /> December 9, 1996 <br /> B-4 GROUNDWATER MONITORING <br /> B-4.1 Water Level Measurements <br /> Water level measurements are made in the wells prior to purging and sampling the wells. <br /> Measurement protocol is as follows: <br /> 1. The wells are opened and allowed to equilibrate with the atmosphere. <br /> 2. The water level probe is decontaminated in a trisodium phosphate wash, followed <br /> by a distilled water rinse, prior to use in each well. <br /> 3. Water level measurements are made using a conductivity-based water-level meter. <br /> Depth-to-water is generally measured from a surveyed mark on the north rim of the <br /> PVC well casing. <br /> The water level measurements are converted to elevations using the surveyed casing <br /> elevations. <br /> B-4.2 Groundwater Sampling <br /> Groundwater samples are collected from the monitoring wells at the site. The sampling <br /> protocol for each well is as follows: <br /> 1. Down-well equipment (pumps, bailers, etc.) is decontaminated by steam cleaning, <br /> or by scrubbing in a trisodium-phosphate wash followed by a distilled water rinse, <br /> prior to use in each well. Bailer cord is replaced prior to use in each well. <br /> 2. The depth-to-water is measured using a conductivity-based water-level meter. <br /> 3. The volume of water standing in the well is calculated by subtracting the depth-to- <br /> water measurement from the depth of the well and multiplying by the appropriate <br /> conversion factor(3.14 *radius 2). <br /> 4. Three to five well volumes of water are purged from each well using a submersible <br /> pump, bladder pump,or Teflon bailer. <br /> 20-3978-O1.WR91A2R9601 d3 Page B-5 01996,Kleinfelder, Inc. <br />