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Adequacy Review Weber Pit No. 2 3 8/15/95 M-95-056 RECLAMATION PLAN - Exhibit F of the Reclamation Plan shows the final configuration of the backfilled and reduced highwall as being 3:1 slopes with a slope length of 110 feet. The 3:1 slopes appear to be lacking any undulations or drainage channels to convey drainage from the undisturbed uplands across the reclaimed slopes. During the 8/8/95 pre-operation inspection, DMG staff commented that riprap lined channels installed on the reclaimed 3:1 slopes would enhance the stability of the backfilled material. DMG is concerned that the backfilled material will erode rapidly if concentrated drainage from the upland channels is not conveyed across the bare slopes within an erosion resistant channel. Please provide comment on how slope stability and protection to the prevailing hydrologic balance will be ensured for upland drainage crossing the disturbed area. Specific area of concern is with the ephemeral drainage channel to be interrupted in Phase 1 and 2 ofthe operation. Revegetation seed mix is lacking a nitrogen fixing species, please include a properly inoculated legume seed. The revegetation seed mix is also lacking any shrub species, DMG recommends that shrubs be included, especially on the 3:1 slopes. Establishment of servicebetry, snowberry, and/or antelope bitter brush shrubs on the reclaimed slopes will aid in erosion resistance and provide greater diversity in reclamation revegetation. Exhibit E states that mulch will be considered, even though the SCS has recommended the use of mulch. Please commit to mulch application as per SCS recommendation. WATER INFORMATION -Please provide sufficient evidence that the applicant has applied for a Stormwater Permit from the Water Quality Control Division. PROOF OF PUBLICATION -Upon completion of the required four publications with a local newspaper, please provide the DMG with proof of publication. BOND CALCULATIONS - A reclamation cost estimate for the proposed operation will be prepared by DMG staff and forwarded to the applicant as soon as responses to the comments contained in this adequacy review are received. As such, it is essential that these review comments be responded to in a timely manner so that a bond amount can be finalized prior to the proposed decision date set for the application. Please contact me at the Durango Field Office, 1474 Main Ave., Room 207, Durango, CO 81301, telephone number 247-5062, should you have any questions or comments. Sincer 1 ' u~~~:~~~ Wallace H. Erickson Environmental Protection Specialist cc: Michael Stanton, consultant.