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October 2000 <br />2 <br />• 2.0 PROCEDURES <br />2.1 We1lInspection <br />The integrity of all monitoring wells will be inspected prior to purging and sampling. The <br />casing and concrete pad will be checked for cracks or fissures. Each well will also be checked <br />to make sure that the protective cover is locked and that the well has not been damaged by <br />vandalism, animals, heary equipment, or other causes. The inspection will verify that the tops <br />of casings are sufficiently elevated to prevent infiltration of surface runoff into the well. The <br />proximity of the wells to roads, waste, or other potential sources of contamination will be <br />noted. No insecticides or lubricants will be used in or around the wells. Well inspection data <br />will be recorded on field sampling forms. <br />2.2 Water Level Measttrement <br />Water levels will be measured in each well prior to initiating purging and sampling activities. <br />Groundwater elevations will be calculated from the measured depth to water using each well's <br />respective measuring point elevation. The measuring point elevation will be surveyed at the <br />top of the monitoring well casing. This point will be marked by a small notch in the casing. <br />Water levels will be measured with an electronic, reel-mounted water level indicator. The <br />water Level indicator calibration and instrument functions will be checked and verified <br />according to manufacturer's specifications prior to use at the site. <br />Prior to mobilization to the site, and between each field water level measurement, the water <br />level indicator shall be thoroughly decontaminated using the following procedure: <br />- Hand wash the instrument, including the sensor, the spool portions of the <br />real (the portions of the reel that contact the tape) and the entire length of <br />• <br />I:\OU3191\I191GWSAPREV 1009.DOC Sedalia Rerycling Center and Depository <br />