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Richard D. Lamm Governor i ~ iiiiiiiiiiiuiiiiii DEPARTMENT OF NATURAL RESOURCES David H. Getches, Executive Director MINED LAND RECLAMATION DI\ DAVID C. SHELTON, Director October 18, 1983 Mr. Larry O'Brian Environment, Inc. 9989 ldest 60th Avenue Arvada, Colorado 80004 RE: Robinson Brick and Tile Company, Chieftan South Mine, File 81-148 Dear Mr. O'Brian: Thank you for you responses of October 7, 1983 to the Division's earlier adequacy correspondence. After reviewing your letter, there are three areas that are unclear as to what the operator is actually proposing to do and where the Division believes clarification and commitment by the operator is necessary. In the future, the Division would appreciate unambiguous responses to our adequacy questions so that the Division's time and your time are not wasted in addressing the same questions more than once. As we present questions in our letters, we will continue to strive for clarity so as to eliminate as much ambiguity as possible, thereby creating a more efficient process. A fourth new area of concern addressed in this letter was identified and discussed during the Division's inspection of this site with Michael Leidich and yourself on October 14, 1983. This new item is addressed at the end of this letter. Please respond to these issues by October 24, 1933 to allow for Division review of your replies. The Division will use the same nwnbering sequence as used in the correspondence of September 29, 1983. ~A` Exhibit D - Mining Plan ~1.~ As stated in the Division's earlier correspondence, the seed mixture for the topsoil stockpiles only seeds at a rate of 46 seeds per square foot, which is well below the Soil Conservation Service recommended 80 seeds per square foot when broadcast seeding. The Division recommends the following seed mixture that seeds at 80 seeds per square foot and incorporates slender wheatgrass rather than crested wheatgrass since slender is in the permanent seed mixture and crested wheatgrass is not. Is this acceptable to the operator? If not, the operator needs to propose a seed mixture with a seeding rate of 80 seeds per square foot (broadcast rate). 423 Centennial Building, 1313 Sherman Street Denver, Colorado 80203 Tel. (303) 8663567