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C1 TRAPPER ~1NINC IpC. 999 October 26, 1984R~/1w,~~o `` Np~O Ms. Susan Mowry Colorado Mined Land Reclamation Division 423 Centennial Building 1313 Sherman Street Denver, Colorado 80203 MIIyFO 1 194 Co/p. ~p~~N ~Me ~/ONDIVIB/oH ~our~r Ref: Proposed Stockpile Seed Mixes; Deletion of Smooth Brome and Aifalfa Dear Susan: I've reviewed your letter dated 8-23-84 concerning the deletion of alfalfa and Fairway crested wheatgrass from our seed mix for topsoil stockpiles (Tab 1e 3.6-11 of our permit). We will substitute mountain brome for fairway crested wheatgrass as requested. However, we disagree with your request to delete alfalfa. Since alfalfa is a deep-rooted species, up to 30 Eeet, it enhances the quality of topsoil at depths by hosting mycorrhizal fungi. This in turn crea[es a more favorable habitat for Future plant species reestablishment when the topsoil is redistributed. In addition, the number of acres of topsoil stockpiles is approximately 50. This is a very small area in relation to the total numbed of acres that can be retopsoiled Erom our stockpiles, i.e., approximately 1,115 acres at 10 inches. Thus the amount of volunteering which might occur from species established at the stockpile surface would be insignificant. Therefore we do not propose to delete alfalfa Erom our approved seed list. ALso, if this change to our approved seed mix is approved, existing perennial seeded topsoil stockpiles would not be changed. In other words, we would not spray out fairway crested wheatgrass and replace it with mountain brome. Please accept this correspondence as a request Eor a minor revision to our permit (CO-010-81). The enclosed revised page to our permit addresses the pro- posed change from fairway crested wheatgrass to mountain brome. If you have any questions, please call. Best regards, ) ~ J H. Bruce Humphries Sr. Environmental Engineer HBH/mg Enclosure cc: File (2) P.O. Box 187 Craig. Colorado 81626 (303) 824-4401