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k" K L E 1 NFELDER M A-4 GROUNDWATER MONITORING ' A-4 1 Water Level Measurements ' Water level measurements are made in the wells prior to purging and sampling the wells Measurement protocol is as follows ' 1 Prior to obtaining water level measurements, the monitoring wells would be opened and allowed to equilibrate for a period of approximately % hour 2 The water level probe is decontaminated in a trisodium phosphate or non-phosphate detergent wash, followed by a distilled water rinse, prior to use in each well 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 rim of the PVC ' well casing The water level measurements are converted to elevations using the surveyed casing elevations ' A-4 2 Groundwater Sampling 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 trisodium-phosphate or non-phosphate detergent 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 groundwater is measured using a conductivity-based water-level meter ' 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 appropnately prepared bottles provided by the analytical laboratory 20-4439-01 E02/2011 8355 Page 6 of 9 Copyright 2001,Kleinfelder, Inc April 2,2001 i