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File No. 20-3978-01.W 14 kn K L E IN F E L D E R <br /> January 6, 1997 <br /> B-4 GROUNDWATER MONITORING <br /> B-4.1 Water Level Measurements <br /> Water level measurements are made in the wells prior to purging and sampling the wells. <br /> Measurement protocol is as follows: <br /> 1. The water level probe is decontaminated in a trisodium phosphate or non-phosphate <br /> detergent wash, followed by a distilled water rinse, prior to use in each well. <br /> 2. 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 rim of the <br /> PVC well casing. <br /> The water level measurements are converted to elevations using the surveyed casing elevations. <br /> 20-3978-01.W141207PE01 I Page B-6 January 6, 1997 <br /> Copyright 1997, Kleinjelder, Inc. <br />