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File No 20-3769-O11A05 k4 K L E IN F E L D E R <br /> November 11, 1994 <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 <br /> Depth-to- water is generally measured from a surveyed mark on the north run of the <br /> PVC well 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 monitormg wells at the site The sampling protocol <br /> for each well is as follows <br /> 1 Down-well (pumps,equipment bailers, etc ) is decontaminated by steam cleaning, or by <br /> scrubbing in a trisodium-phosphate wash followed by a distilled water rinse, pnor to <br /> 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-water <br /> measurement from the depth of the well and multiplying by the appropriate conversion <br /> factor (3 14 *radius, 0 16 for 2-inch wells, and 0 65 for 4-mch wells) <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 /> r5 Physical parameters (pH, electrical conductivity, and temperature) are monitored for <br /> stability during purging The physical parameter measurements are recorded on purge- <br /> and-sample logs, along with the tune 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 cham-of-custody <br /> control Sample handling is described in more detain in Section A-2 4 <br /> ETH and WC194 <br /> Copyright 1994 Kleinfelder, Inc Page 5 0f 5 <br />