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<br />Colorado River, and no increase in sediment yield due to <br />surface disturbance. The only impact predicted by the <br />operator was temporary dewatering of groundwater in the <br />Rapid Creek Basin. A dewatering trend could not be <br />detected in the groundwater monitoring data. <br />The PHC also states that all of the NPDES discharges have <br />been in compliance. This statement will, of course, have <br />to be updated in the next midterm or permit renewal. <br />6) The issues regarding the Rollins Sandstone remain <br />unresolved. As previously conveyed to the operator, <br />Powderhorn Coal is responsible for demonstrating that the <br />Rollins Sandstone is not an aquifer in the area of the <br />mine. If this demonstration cannot be made, then the <br />Rollins will have to be monitored, and the PHC revised. <br />7) Concerning the items in your initial review: <br />a) Please have the operator provide an <br />explanation for water levels not being <br />reported for wells UTL-O1 and UTL-03, <br />b) Please have the operator provide an <br />explanation for why no flow measurements were <br />provided for June and July, 1995. <br />If you or the operator have questions, call me before September 3. <br />< c •. Larry Roo~}e,~ <br />