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.~ <br />Colorado Quarries, Inc. <br />Black Obsidian Pit <br />File No. M-87-026 <br />February 27, 1987 <br />Adequacy Items Continued <br />Page 2 <br />2. On Page 6 you have stated that sufficient waste rock will be saved for <br />use in backfilling 40 foot high pit walls during reclamation. In order <br />to complete reclamation for minimal cost, you should insure that <br />sufficient waste rock material is stored on-site to complete the <br />necessary backfilling. Please calculate the amount of material that <br />will be needed for backfilling all highwalls, and provide plans for <br />maintaining this amount of material at the site. <br />3. You have stated that a portable crusher may be installed at the site if <br />needed in the future. Please note that if you wish to install a crusher <br />at a future date, you will need local county approval and a Technical <br />Revision to this permit. At that time, please contact us for the proper <br />procedure. <br />4. Please describe more specifically how rock extraction will occur. If <br />rock is blasted, provide evidence that blasting plans will not adversely <br />affect any off-site structures. Also, you should contact the Colorado <br />Division of Mines and/or local Mine Safety Health Administration (MSHA) <br />office regarding blasting plans and quarry wall safety regulations. <br />5. Please provide plans for managing surface water so that <br />sediment-containing storm and snow runoff does not contaminate local <br />stream channels. The staff recommends creating upland diversions around <br />the disturbed areas, and/or building berms or small sediment ponds along <br />the downhill site of the disturbed areas to help settle the sediment out <br />of the water. <br />6. Please provide the names of all owners of record of the surface of the <br />affected area and of the land immediately adjacent to the affected area. <br />Exhibit D - Reclamation Plan <br />1. When reclamation is complete, will the pit areas drain water downhill, <br />or will they be left as internally draining basins or lakes? The staff <br />recommends that the pits be left open at the downhill portions so that <br />snowmelt and storm water can drain away. <br />Exhibit E - Mining and Reclamation Map <br />1. Please show the names of all adjacent landowners and which direction <br />from the affected area their land occurs. <br />2. Please indicate the approximate topographic contours or the general <br />direction of the natural slopes. <br /> <br />