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2.5.4 Precipitation <br />A precipitation gauge was installed near well Na26-EX-2 on April <br />18, 1990. The data obtained from April 18 through November 1990 <br />is shown below: <br />1990 inches <br />April 18-30 0.20 <br />May 0.70 <br />June 0.15 <br />July 1.05 <br />August 0.52 <br />September 0.99 <br />October 1.30 <br />November 0.61 <br />Total for portion of year 5.52 <br />2.5.5 Monitoring Wells <br />Dedicated monitoring wells were constructed in 1990 to monitor <br />four water bearing zones (Dissolution Surface, B-Groove, A-Groove <br />and Perched aquifers Figure 2-1). Immediately down-gradient, <br />monitoring wells were established six months prior to mining <br />(April, 1990) to collect baseline water quality and level data. <br />Up-gradient wells and additional down-gradient monitoring wells <br />• were drilled/recompleted during the summer and fall of 1990. <br />34 <br />