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�� KLEINFELDER 3. Water level measurements are made using a conductivity-based water-level meter Depth-to-water is generally measured from a surveyed mark on the north nm of the PVC well casing The water level measurements are converted to elevations using the surveyed casing elevations A-4 2 Ground Water Sampling Ground water samples are collected from the monitoring wells at the site The sampling protocol for each well is as follows- 1 Down-well equipment (pumps, bailers, etc ) is decontaminated by steam cleaning, or by scrubbing in a tnsodium-phosphate wash followed by a distilled water nnse, prior to use in each well Bailer cord is replaced prior to use in each well 2 The depth-to-water is measured using a conductivity-based water-level meter. 3 The volume of water standing in the well was calculated by subtracting the depth-to- water measurement from the depth of the well and multiplying by the appropriate conversion factor (3 14*radius2, 0 16 for 2-inch wells, and 0 65 for 4-inch wells) 4 Three to five well-volumes of water are purged from each well using a submersible pump, bladder pump, or Teflon bailer. 5 Physical parameters (pH, electrical conductivity, and temperature) are monitored for stability during purging The physical parameter measurements are recorded on purge- and-sample logs, along with the time and volume of water purged at each measurement 6 Samples are collected with a disposable bailer or bladder pump into appropriately prepared bottles provided by the analytical laboratory 7 Samples for metals analysis are usually filtered in the field at the time of collection 8 Samples are immediately labeled and placed in an iced sample container At the end of the day, the samples are delivered to the analytical laboratory under chain-of-custody control. I • FWP2-92-25 Page A-4 Copynght 1992 Klemfelder, Inc