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STATE OF COLORADO <br />DIVISION OF RECLAMATION, MINING AND SAFETY <br />Department of Natural Resources <br />1313 Sherman St., Room 215 <br />Denver, Colorado 80203 <br />Phone: (303) 866-3567 <br />FAX: (303) 832-8106 <br />MEMO <br />Date: September 25, 2009 <br />From: Tom Kaldenbach <br />To: Janet Binns <br />Re: Foidel Creek Mine (C-82-056), PR-8 <br />COLORADO <br />D I V1 S I ON OF <br />RECLAMATION <br />MINING <br />SAFETY <br />Bill Ritter, Jr. <br />Governor <br />Harris D. Sherman <br />Executive Director <br />Ronald W. Cattany <br />Division Director <br />Natural Resource Trustee <br />I have reviewed the operator's responses that we received on September 18, 2009, responding to <br />our preliminary adequacy review letter of July 28, 2009. The responses resolved all of my <br />previous comments (1 through 5). I have a new comment 6. <br />6. Please add to the permit application a prediction of the worst possible consequences of <br />subsidence impacts to the springs that are located around the western perimeter of the <br />Western Mining District (shown on the recently submitted copy of Map 15A). Please <br />include a table that is similar to the partially completed one shown below, and include a <br />description of the method and assumptions used for predicting drawdowns from new <br />Western District Mining in the table. <br />Spring Source <br />(hydrostratigraphic unit) Predicted maximum <br />feet of drawdown of <br />the potentiometric <br />surface of the spring <br />source at the spring <br />location <br />Boeddeker Spring #1 <br />Boeddeker Spring #2 <br />Gertie Spring #1 <br />Livestock Spring #2 <br />Coyote Spring Trout Creek Sandstone <br />Perry Spring #1 <br />Perry Spring #2 <br />Perry Spring #3 <br />Perry Spring #4 <br />Perry Spring #5 <br />Perry Spring #6 <br />cc (via email): Dan Hernandez <br />Office of Office of <br />Mined Land Reclamation Denver • Grand Junction • Durango Active and Inactive Mines