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k <br /> r1 y <br /> KLEINFELDER <br /> . A-3.3 Equipment Decontamination <br /> To reduce the potential for cross-contamination between wells, developing equipment is washed <br /> in a tnsodium phosphate or lab grade detergent solution and rinsed in distilled water or steam <br /> cleaned prior to use in the next monitoring well <br /> A-3 4 Well Survey <br /> The locations of soil borings and monitoring wells and the elevation of the top of the PVC casings <br /> will be surveyed and tied into permanent markers, if readily available Survey accuracy is 0 1 foot <br /> for the "x" and "y" coordinates and 0 01 foot for the "z" coordinate The depth to static <br /> groundwater is measured from a set location at the top of the PVC casing The depth of water is <br /> then subtracted from the elevation of the top of the well casing to provide a groundwater elevation <br /> for each monitoring well location <br /> A-4 GROUNDWATERM RING <br /> A-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 /> S1 The wells are opened and allowed to equilibrate with the atmosphere <br /> 2 The water level probe is decontammated in a tnsodzum phosphate wash, followed by a <br /> distilled water rinse,prior to use in each well <br /> 3 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 nm of the <br /> PVC well casing <br /> The water level measurements are converted to elevations using the surveyed casing elevations <br /> A-4.2 Groundwater Sampling <br /> Groundwater samples are collected from the monitoring wells at the site The sampling protocol <br /> for each well is as follows <br /> 1 Down-well equipment (pumps, bailers, etc) is decontaminated by steam cleaning, or by <br /> scrubbing in a tnsodium-phosphate wash followed by a distilled water rinse, prior to use <br /> in each well Bailer cord is replaced prior to use in each well <br /> 2 The depth-to-water is measured using a conductivity-based water-level meter <br /> ETH and WC/94 <br /> Copyright 1994 Kletnfelder Inc Page 4 of 5 <br />