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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 C O L O R A D O <br /> <br />Phone: (303) 866-3567 D IV IS I ON OF <br />RECLAMATION <br />FAX: (303) 832-8106 M I N I N G <br /> <br /> SAFETY <br /> John W. Hickenlooper <br /> Governor <br />Date: <br /> Mike King <br /> Executive Director <br />To: <br /> Loretta E. Pineda <br /> Director <br />From: Brock Bowles <br />RE: Colowyo Mine (Permit No. C-1981-019) <br />Technical Revision No.84 (TR-84) <br />Response to Technical Revision - 84 (Nov 5, 2010) <br />Aspen and Tall Shrub Establishment Areas <br />1. Page 4.15-12, third paragraph - The field study areas for Aspen (20 acres) and tall shrub <br />(20 acres) have been reduced proportionately (18.5 and 12.0 acres respectively) to the <br />corresponding reduction in plant community disturbance. It is the Division's understanding <br />that 20 acres each was felt to be an adequate size for successful field trials rather than a <br />proportion of disturbed habitat (see CDOW letter dated March 7, 2008). Does the CDOW <br />still require 20 acre plots for field trials? <br />2. Page 4.15-12, bullet 1 and page 4.15-12, bullet 2 - It is stated "Colowyo agrees to establish <br />one small (one acre) aspen establishment area..." This statement should read "Colowyo <br />agrees to establish 1-20 acres (or many field trial areas with a cumulative area not less than <br />20 acres) aspen establishment area..." Please fix text accordingly. This statement may be <br />contingent on the decision by the CDOW of bullet #1 above. <br />Page 4.15-13, bullet lc - It is stated "Approximately 48 inches of topsoil will be placed to <br />replicate common topsoil depth conditions..." Please change the topsoil replacement depth <br />to "at least 48 inches" which better replicates the conditions in the undisturbed areas, and to <br />incorporate the concept of significant variation in soil thickness that would be applied <br />within the South Taylor area. Also make the appropriate changes to Page 4.15-14, bullet <br />2c. <br />4. Page 4.15-13, bullet 1 e - Colowyo has committed to planting commercially available 2-3 <br />foot containerized aspen stock for planting purposes from the most similar source elevation <br />available in the area. Research indicates that the larger the containerized aspen and native <br />shrubs are the better their chances are for survival. The Division recommends that <br />Colowyo use 1 gallon or larger containerized aspen, with at least 10% being 5 gallon <br />containerized trees. <br />Office of Office of <br />Mined Land Reclamation Denver • Grand Junction • Durango Active and Inactive Mines