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<br />DIVISION OF RECLAMATION, MINING AND SAFETY <br />Department of Natural Resources <br />1313 Sherman S[., Room 215 <br />Denver, Colorado 80203 <br />Phone: (303) 866-3567 <br />FAX: (303) 832-8106 <br />STATE OF COLORADO <br />T0: Dan Matthews ~~i~~'lp. <br />From: Kent Gorham <br />/' <br />CC: Sandy Brown <br />Date: July 23, 2007 <br />COLORADO <br />DIVISION O F <br />RECLAMATION <br />MINING <br />- &- <br />SAFETY <br />Bill Ritter, )r. <br />Governor <br />Harris D. Sherman <br />Executive Direcror <br />Ronald W. Cattany <br />Division Direttor <br />Natural Resource Trustee <br />Re: 2006 Roadside AHR Review-PHC Predictions, Roadside Mine, #C-81-041 <br />I have completed a review of the 2006 AHR for the Roadside Mine regarding the data as presented and <br />the Probable Hydrologic Consequences presented in Exhibit 19 of the permit. My comments aze <br />organized based on the presentation in Exhibit 19. <br />1. The data collected indicate no impact to Rapid Creek or its tributaries. Pillars protect the <br />channels of the creeks as well as the area underlying Cabin Reservoir within a 12-degree angle <br />of draw. Monitoring of ephemeral channels indicates flow only in response to storm runoff. <br />2. The 2006 data indicates .09% increase in TDS in the Colorado River due to mine water <br />discharge, which is slightly less than the .1 % predicted. <br />3. There were no sediment pond discharges recorded or sampled. <br />4. Percolation through the refuse pile from meteoric water is not detected as predicted, and is <br />likely insignificant, as the refuse piles are now covered with soil and vegetation, with the <br />exception of an area left open on CRDA-1. <br />These data, as presented in the 2006 AHR, show the approved probable hydrologic consequences are <br />reasonable and impacts from the mine are within the constraints of these predictions. <br />If you have questions or comments, please let me know. <br />Office of Office of <br />Mined Land Reclamation Denver Grand lunRion Durango Active and Inactive Mines <br />