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.; ~ ~ III IIIIIIIIIIIIIIII STATE OF COLORADO DIVISION OF MINERALS AND GEOLOGY Department of Natural Resources 1313 Sherman Sr, Room 215 Denver, Colorado 80203 Phone: (303) A66-3567 Fn%:13031 83 281 06 June 2, 1997 ~~ I.t~L IrH I r :~ ~Ub(,~ ~iw valR-y Michael Folkerth Moonscape Partners LLP 1464 G Road Delta CO 81416 i Re: Moonscape Pit, File No. M-97-027, Technical Adequacy Review. ~- Dear Mr. Folkerth, ~~ ~~~ ~R DEPARTMENT 0- NATURA] RESOURCE Roy Romer Governor James 5. Lochhead Exec W ive Direcor nlichael B. Long Division Director I have completed a review of the above-named permit application, and have a few questions concerning the technical aspects. Overall this is a well prepared application, so this letter does not actually touch on many issues to be resolved. I have arranged my comments below in order of the exhibit to which they pertain. Where I have nor included any questions under an exhibit heading, I consider that exhibit to be satisfactory at this time. Exhibit C -Mining Plan The plan mentions that the mining is to occur on the mesa top generally from the west to the east, and that several types of possible processing may occur on the site. However, there is no indication of how the mining at the edge is to begin without potential of material rolling down the slope (offsitel or of onsite drainage patterns. Please indicate the actual locations of the processing equipment and product stockpiles. Pertaining to the asphalt botching in the plan, there is no information about location of the plant nor sufficient details of the containment berms. Is the depth of mining to vary between 6 to 25 feet? Will the gravel be mined down to the shale layer? Will a buffer area alongthe perimeter be maintained? Please provide some indication of the slope gradients to be maintained during mining, the amount of area to be disturbed at one time, and any types of containment structures present, since these will affect the bond amount. The prior exhibit mentioned that this site is located on a bluff above Seep Creek, and the NRCS report stated that runoff is rapid and the soils are quite erodible. Because of the location of the permit boundary, this raises questions as to sediment control during mining. These items may be described in the narrative and depicted on the maps. Exhibit D -Reclamation Plan The road leading into the site is to remain after reclamation, but please provide details of the road drainage control and the cut and fill slopes, as appropriate. Is reclamation to occur concurrently during mining, or after all mining is complete? The seed mix in the revegetation plan looks adequate. A couple questions came to mind, however, such as, if the NRCS information stated that shrubs offer the best ("fair") potential for wildlife habitat, even better than grass I"very poor"), do you feel that a shrub species should be added to the mix? If the seed is broadcast, how will seed be incorporated into the soil? Also, within the paragraph