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~II II~~I~~I~~I~~ ~I~ DIVISION OF MINERALS AND GEOLOGY Depanmem o(Natural Resources I f 13 Sherman SI.. Room 215 Dcnvur, Colorado 80203 Phnm•: ISUJI 866-3567 Ntarch 23, 1998 I~~~~ DEPARTMENT OF NATURAL RESOURCES Las Animas County c~",e°~; Attn: Robert Lucero, County Planner lames s. w~hhead 200 E. Firs[ , Room 104 E'r`°'"e D"~"°` A1iChde B. lan4 Trinidad, Colorado 81082 Drvrsion Direcro~ RE: Permit Application Adequacy Review; File No. M-98-O11; Unwin Gravel Pit Dear Mr. Lucero: The Division received your application fora 110 Construction Materials Reclamation Permit on February 19, 1998. The application was initially deemed inadequate for lack of a performance warranty, which was subsequently submitted on Mazch 2, 1998. The application was then called complete and assigned a decision date of April I, 1998. Overall the application is well organized and substantially addresses the requirements of rule 6.3 of the Construction Materials Rules and Regulations of the Colorado Mined Land Reclamation Boazd. One area that is inadequate is under Exhibit C- Mining Plan, 6.3.3(6). This regulation requires that the operator specify how topsoil will be stockpiled and stabilized with a vegetative cover until used in reclamation. The application indicates that this pit will be open for approximately 10 years and the mine plan indicates that approximately 5 inches of topsoil will be salvaged and stockpiled in a designated area as shown on the Mine Plan Map. The mine plan states that a cover crop of oats will be used to stabilize the stockpiled topsoil, however, oats is an annual grain that will only provide temporary stabilization. Since the topsoil stockpile will be in place for up to 10 years, it should be seeded with a perennial grass mixture that will provide stabilizing cover for the entire length of time that the pile will be in place. Typical temporary mixtures usually include one or two wheat grasses (preferably not crested wheat grass), smooth brome and possibly a warm season grass such as sideoats grama. Please select a suitable mix for your area and provide the Division with a copy of your revised topsoil stockpile seed mix. Enclosed with this letter is a copy of a Department of the Amoy, Corps of Engineers letter that the Division received indicating that a 404 permit would not be required for this reclamation permit. The Division has not received any other correspondence concerning this application from the public or other commenting agencies. Since we do not have any other concerns with this application, once we receive and approve the topsoil stockpile seed mix, this application \vill be approved. STATE C~ COLORADO