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k4 KLEINFEL1) ER <br /> B-3 4 Equipment Decontamination <br /> To reduce the potential for cross-contamination between wells, all developing and sampling <br /> equipment Is washed In a trlsodium phosphate solution and rinsed in distilled water or steam <br /> cleaned prior to use in the next monitoring well <br /> B-3 5 Well Survey <br /> The locations of soil borings and monitoring wells and the elevation of the top of the PVC <br /> casings is 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 ground water Is measured from a set location at the top of the PVC casing The <br /> depth of water Is then subtracted from the elevation of the top of the well casing to provide a <br /> ground water elevation for each monitoring well location <br /> 40-YP9179140I OPO 19 12 <br /> Copyright 2000 Klecnfelder, Inc <br />