2000-05-31_PERMIT FILE - M2000002

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iii iiiiiiiiiiiuiii , DIVISION OF /v11NERALS AND GEOLOGY Depanmenl of N. Wral Resources 1 31 1 Sherman St.. Room ? l i Denver, Colorado 80'_03 Phone: 13031 866-3567 FAX: 1303) N}?8106 May 31, 2000 Pam Acre Tuttle Applegate, Inc. 11990 Grant Street, Suite 304 Denver, CO 80233 RE: Tanabe Pit, Regular 112 Application, Adequacy Review, File No. M-2000-002 Dear Ms. Acre: ~~ DIVISION OF htINERAlS GEOLOGY RECLAMATION MINING•SAFETY s,n o..rns Governor GrrR E. lY,ddrer E~nvo,r Ducclor br,chael 9. LnnR Drvisbn Duccwr Listed below are outstanding adequacy review comments on the above-captioned permit application. The comments are listed in the same order as the Division's March 30, 2000 adequacy letter and are items that require either clarification or additional information prior to 12:00 A.M., June 2, 2000. The Division is still reviewing the stability analysis and groundwater hydrology portions of your May 24, 2000 adequacy response. As you may know, the Division will be making a recommended decision on your application on the afternoon of June 2, 2000. EXHIBIT D -MINING PLAN 5. On page 5 the applicant specifies that an overhead conveyor will be used to transport aggregate materials from the'fanabe Pit across Brighton Road over to the processing plant at the Howe Pit. Please indicate if the support structures will be removed during final reclamation and if so, provide a demolition cost for removal. 6. The applicant has provided a revised table of the maximum disturbance expected at any one time. This includes 13.2 acres in the Phase ]Area. Please verify the expected depth to groundwater in the wetland area, the depth of backfilling required to produce the desired hydrologic soil conditions for wetlands, and the volume of backFill material required (including process fines and overburden materials). 8. The applicant has provided a representative cross-sectional diagram of an OSE approved liner that may be used at the Tanabe Pit. For purposes of evaluating the reclamation cost for the Tanabe Pit, the Division will refer to the representative diagram. In the absence of a specific design for the Tanabe Pit, the Division requests that the operator commit to securing design approval from the OSE prior to construction and to providing the Division with a technical revision to the reclamation plan in the event that an alternate design is used. EXHIBIT E -RECLAMATION PLAN • STATE OF COLORADO 12. There are no provisions for site grading or revegetation of the 32.2 acre wetland in the Phase [area. At a minimum, the applicant will need to provide a grading plan showing the approximate contours or slopes