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k` ■ KLEI NFEL DER 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 Groundwater Sam lin ' Groundwater 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 or non-phosphate detergent wash followed by a ' distilled water nnse, pnor to use In each well Bailer cord is replaced prior to use in each well 2 The groundwater depth to is measured using a conductivity-based water-level meter p 3 The volume of water in gallons standing in the well is calculated by subtracting the depth to groundwater measurement from the depth of the well and multiplying by the ' appropriate conversion factor(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 while 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 28699 EOI /STO311627 Page A-7 Copyright 2003,Kleinfelder,Inc April 22,2003