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k" KLEINFELDER <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 PVC <br /> well casing <br /> The water level measurements are converted to elevations using the surveyed casing elevations <br /> A-4.2 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 or non-phosphate detergent wash followed by a <br /> distilled water rinse, prior to use in each well Bailer cord is replaced prior to use in each <br /> well <br /> 2 The depth to groundwater is measured using a conductivity-based water-level meter <br /> 3 The volume of water in gallons standing in the well is calculated by subtracting the depth <br /> to groundwater measurement from the depth of the well and multiplying by the <br /> appropriate conversion factor(0 16 for 2-Inch wells, and 4 65 for 4-inch wells) <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 while purging The physical parameter measurements are recorded on purge- <br /> and-sample logs, along with the time and volume of water purged at each measurement <br /> 6 Samples are collected with a disposable bailer or bladder pump Into appropriately <br /> prepared bottles provided by the analytical laboratory <br /> 7 Samples for metals analysis are usually filtered in the field at the time of collection <br /> 8 Samples are Immediately labeled and placed in an Iced sample container At the end of <br /> the day, the samples are delivered to the analytical laboratory under chain-of-custody <br /> control <br /> A-5 Vadose Zone Monitorin <br /> 1 Prior to conducting lysimeter sampling, the pressure-vacuum equipment is checked and <br /> cleaned A Soil-Moisture hand pump with a pressure-vacuum gage is used to measure <br /> residual and implied pressure-vacuum Nitrogen gas is used to purge the lysimeter <br /> system for sampling An air pump is available as a back up <br /> 20-4439-01 E04/ST02R397 Page A-6 <br /> Copyright 2002, Kleinfelder,Inc August 22,2002 <br />