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i <br />1 lit <br />i th <br />if <br />t <br /> y <br />n <br />qua e aqu <br />er pene <br />rated by the well. The general <br /> procedures to be used are presented below. Necessary deviations <br />' from these procedures should be fully documented on the Field Data <br /> Collection Form. <br /> <br /> 2.2.5 Locking Wells: Wells will be un locked immediately prior to <br /> initiating sampling procedures. All wells will be re-secured when <br /> sampling is completed and at any time the sampling crew leaves the <br />' area of the well. Access to the wells will be controlled by Battle <br /> Mountain. <br />' 2.2.6 Water Levels and Measurements: The diameter, water level and the <br />' total depth of each well will be measured to calculate the volume <br />of the water column. Measurements will be made to the nearest 0.01 <br />' foot. Measuring devices used in the well will be cleaned prior to <br />initial use by the following procedure: <br />' (1) rinse with tap water; <br />(2) rinse with de-ionized water; and <br />t (3) air dry. <br />' 2.2.7 Well Evacuation: Prior to evacuating water from the well, the <br />volume of water in each well will be calculated. Ground water from <br />' all wells will be evacuated either by using a bailer or a <br />submersible pump before any sampling takes place. Normally, a well <br />' will not be sampled unless all water standing in the Well casing <br />has been replaced by fresh ground water from the acguifer. A <br />minimum of three (3) volumes of water will be evacuated from each <br />' well. In no case will sampling take place more than two hours <br />after the third volume has been removed from the well. During this <br />' procedure, bailers will be lowered gently into the wells to <br />minimize agitation of the ground water. <br /> <br />-14- <br /> <br />