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h'9 KLEINFELDER <br /> File No. 20-4054-01.E01 <br /> May 1, 1997 <br /> B=4 GROUNDWATER MONITORING <br /> B4.1 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 by a <br /> distilled water rinse,prior to use in each well. <br /> 3. Water level measurements are made using a conductivity-based water-level meter. Depth- <br /> to-water is generally measured from a surveyed mark on the north rim of the PVC well <br /> casing. <br /> The water level measurements are converted to elevations using the surveyed casing elevations. <br /> B4.2 Groundwater Sampling <br /> Groundwater samples are collected from the monitoring wells at the site. The sampling protocol <br /> for each well is as follows: <br /> 1. Down-well equipment (pumps, bailers, etc.) is decontaminated by steam cleaning, or by <br /> scrubbing in a trisodium-phosphate wash followed by a distilled water rinse,prior to use in <br /> 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-water <br /> measurement from the depth of the well and multiplying by the appropriate conversion <br /> factor(3.14 *radiusZ). <br /> 4. Three to five well volumes of water are purged from each well using a submersible pump, <br /> bladder pump, or Teflon bailer. <br /> 5. Physical parameters (pH, electrical conductivity, and temperature) are monitored for <br /> stability during purging. The physical parameter measurements are recorded on purge-and- <br /> sample logs, along with the time and volume of water purged at each measurement. <br /> 20-4054-OI.E01-G0112017P036 Page B-5 01997,Kleinfelder,Inc. <br />