2003-08-18_REVISION - M1980055hr

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an offsite disposal cost. Costs for breaking the concrete floor of the shop building and moving the pieces will be influenced by the dimensions and reinforcement of the concrete. (3) If these concrete details are known, please provide them so that costs may be calculated. Likewise, costs for backfilling the portal with rock will be affected by the volume of rock to be used and the equipment to be mobilized for the task. (4) If known at this time, please provide the adit dimensions, the type of equipment to be used, and the slope gradient on the exterior surface. The grading of the dump faces to a maximum of slope of 2:1 is adequate. (5) Does this stated 2:1 gradient also pertain to other slopes created on the site (such as the cut faces above the benches, or slopes adjacent to the roads)? The access roads are part of the permitted area, and the degree of their reclamation should be specified in the plan. This could include grading the cut or fill slopes, permanent drainage concerns, possible culvert removal, ripping and seeding, etc. (6) Please clarify what the road reclamation will consist of. There is a topsoil stockpile to be used for reclamation. Obviously, topsoil replacement is a bonded task, so if certain details can be provided a better cost calculation may be made. (7) Please clarify the volume of topsoil present, what portions of the site will be topsoiled, and the depth it will be spread. The proposed seed mix appears very similar to the former seed mix, and is adequate for the site. It is assumed that the seeding rates given are for pounds of "pure live seed" per acre and not for bulk seed. (8) Please clarify if that is the case. The revision packet does not specify what application method the new seed mix and the rates refer to. Note that on slopes steeper than 3:1 a tractor is not used to drill the seed, and though a dozer can pull a drill, it cannot traverse the slope horizontally. This means that furrows will run up and down the slope. If the seed is broadcast, dragging the surface afterward to incorporate the seed is required. (9) Please specify the method of applying the seed. The original plan does not specify the use of fertilizer or mulch. It is assumed that these aspects of the plan will not change. Please let me know if this is incorrect. Reclamation Map (Exhibit E -Rule 6.3.5(3)1 Based on the details of this technical revision, a reclamation map must be prepared. It must depict the site in its fully reclaimed state. Please refer to Rules 6.2.1(2) and 6.3.5(3) for map standards and required content. The base prepared for the new mining map is excellent and may be used in a modified form for the reclamation map. As long as the new reclamation map conforms to all the reclamation details to be approved in this revision, and conforms to the new boundaries, the Division's decision on this revision does not need to be delayed until the submittal of the reclamation map. It may be prepared and submitted after the decision is made on this revision, if such submittal is made within 60 days after the decision. (When you submit the new map, please submit two copies and clearly mark one of them for use in the Durango field office.) The decision date on this technical revision is set for September 3, 2003. Please provide your written responses to the questions above with enough time before the decision date so that the information can be reviewed. If additional time is needed to prepare and submit the responses, a written request for extension may be submitted. Until adequate responses are received, this revision cannot be approved. I am required to state that if the revision is not adequate by the close of business on the decision date, and the date has not been extended, the revision may be denied. Approval of this revision will bring the outdated and inadequate portions of the file up to date, and will also act to correct the last of the outstanding problems on this permit. When it is approved, the revision approval letter will reflect this fact.