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"1 h"F� KLEINFELDER <br /> File No 20-3769-01 <br /> March 16, 1994 <br /> minute (gpm) depending on recharge rate and casing size. Development continues until the <br /> discharge runs relatively clear of fines Approximately 5 to 10 well volumes generally are <br /> removed from each monitoring well Discharge water is stored in 55-gallon drums and left on <br /> site for later discharge or disposal by the client, depending on laboratory results. <br /> A-3.3 Equipment Decontamination <br /> To reduce the potential for cross-contamination between wells, developing equipment is washed <br /> in a trisodium 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 <br /> casings will be surveyed and tied into permanent markers, if readily available. Survey accuracy <br /> is 0.1 foot for the "x" and "y" coordinates and 0.1 foot for the "z" coordinate. The depth to <br /> static groundwater is measured from a set location at the top of the PVC casing. The depth of <br /> water is then subtracted from the elevation of the top of the well casing to provide a groundwater <br /> elevation for each monitoring well location. <br /> A-4 GROUNDWATER MONITORING <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 /> 1. <br /> ollows-1. The wells are opened and allowed to equilibrate with the atmosphere. <br /> 2. The water level probe is decontaminated in a trisodium phosphate wash, followed by <br /> a distilled water rinse, prior to use in each well. <br /> 3. Water level measurements are made using a conductivity-based water-level meter. Depth-to- <br /> water is generally measured from a surveyed mark on the north nm of the PVC well <br /> 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 /> Copyright 1994 Kloinfelder, Inc Pago 4 of 5 <br />