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~ • Egviroqrr?eqt, LARRY E. O'BRIAN ~11ltID lNT January 4, 1982 Mr. Jay Lucas, Reclamation Mined Land Reclamation 1313 Sherman Street, Room Denver, CO 80203 Dear Mr. Lucas, III IIIIIIIIIIIII III^ 999 lryc. 9989 WEST 80TH AVENUE ARVADA,COLORADO 80004 303- 423- 7297 _ _.-- ~o Specialist ~ "I'.~~,~. I ~ 1 423 „LI ' n , ~~1d1 Colo. Dc9i. Re Second Adequacy Letter ROBCO's Chieftain South Mine MLR File No. 81-148 This letter responds to your second adequacy letter dated September 3, 1981. LVe delayed replying to your letter until we learned what changes, if any, might be necessary because oP the issue of "compliance with county zoning." At this time, it appears no changes are required. It is our understanding that you will be hearing from Mr. Belmore T. Martin, attorney for ROBCO, on this matter. Our responses follow the paragraph numbering system used in your September 13 letter. Mining Plan 1. Thank you Por your agreement on this item. 2. Contours on Map Exhibit D-1 indicate horizontal to vertical gradients will vary from 2 to 1 on the slopes. to 50 to 1 on the pit floor. S9e intend to follow this plan. The settling pond located at the south end will cover about 0.4t acres with a depth of about 3 feet. In a no-silt condition, this pond could hold a maximum of 1.2t acre- feet of water. Admittedly, this is very little water, but the capacity is sufficient !or our needs. We appreciate your defining "significant" for us; now if you will give us your definitio^ of "large" we can be specific. Joking aside, we do not believe this very tiny pond has the potential for the type of damage you are concerned with. 3. Weekly, if needed. 4. Basically, this is an overflow pond, but under "usual" con- ditions water will leave the pond by evaporation. Under cloudburst conditions it might overflow. Remember, please, that this is a dry operation; we abhor water in the pit.