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•• <br /> KLEINFELDER <br /> B-3.3 Equipment Decontamination <br /> To reduce the potential for cross-contamination between wells, developing equipment is washed <br /> in a trisodium phosphate or non-phosphate detergent solution and rinsed in distilled water or <br /> steam cleaned prior to use in the next monitoring well. <br /> B-3.4 Well Survey <br /> The locations of soil borings and monitoring wells, and the elevation of the top of the PVC <br /> casings are usually surveyed and tied into permanent markers, if readily available. Survey <br /> accuracy is 0.1 foot for the "x" and "y" coordinates and .01 foot for the "z" coordinate. The <br /> depth to static groundwater is measured from a set location at the top of the PVC casing (usually <br /> the north rim). The depth of water is then subtracted from the elevation of the top of the well <br /> casing to provide a groundwater elevation for each monitoring well location. <br /> B4 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 /> I. The water level probe is decontaminated in a trisodium phosphate or non- <br /> phosphate detergent wash, followed by a distilled water rinse, prior to use in each <br /> 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 <br /> the PVC well casing. <br /> 3. The water level measurements are converted to elevations using the surveyed <br /> casing elevations. <br /> 20-YPS-160/201 SP 182/201 SC356 Page B-6 <br /> © 1995. Klemfcldcr,Inc August 4, 1998 <br />