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' k'% KLEINFELDER ' north nm). The depth of water is then subtracted from the elevation of the top of the well casing ' to provide a groundwater elevation for each monitoring well location. C-4 GROUNDWATER MONITORING C-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''/z 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. C-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 rinse, 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). ' 20-2594-03.004/2011 R447 Page G6 June 8,2001 Copyright 2001,Kleinfelder,Inc.