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<br /> <br /> <br />Mr. John Walters -2- September 6, 1991 <br />Rule 2.04.7(4)(a) <br />Figure 1.1-3a shows the location of the "Dale Mitchell Ditch", but <br />it is not obvious that this is the only such structure in the area. The <br />following information is readily available from the Division of Water <br />Resources and should be provided to MLRD for each structure: location, <br />name and address of owner, type of structure, use and quantity of water <br />and adjudication and appropriation dates. <br />Rule 2.05.3(3) <br />Figure 2.2-2 should be revised to depict the location of an <br />underground fuel storage tank. <br />Rule 2.05.3(4) <br />The clear water outflow ditch flowing along the south side of the <br />rip-rap and topsoil stockpiles and draining through the 51 + 53 culvert <br />will channel erosive velocities as designed. At a flow rate of 6.3 CFS <br />and an average slope of 5y, the calculated velocity in the ditch is 5.58 <br />FPS. Please submit further design detail demonstrating that non-erosive <br />velocities will exist in the ditch or submit new designs that take into <br />account channel protection. <br />Culverts 49 + 03, 51 + 53 and 53 + 76 do not have a clearly <br />indicated outlet flow path design. The nature of these outlets should be <br />further described so as to demonstrate that the outlet velocity is <br />non-erosive. <br />Rule 2.05.4(2)( <br />A large number of drill holes shown on the "Cameo Seam Outcrop ~ <br />Drill Hole Location Map" (previously Figure 2.1-5> have been left off the <br />new version (Figure 2.1-3). Examples include 7-21-2 through 7-21-5 and <br />numerous holes in the NW1/4 Section 9 and in the E1/2 Section 11. The <br />status of these drill holes should be addressed. <br />Rule 2.05.6(1) <br />The Emission Permit initially approved by the Colorado Department <br />of Health states that "Maximum production shall not exceed 246,000 tons <br />annually". The mining plan anticipates a production level of at least <br />250,000 tons par year. The Emission permit should be revised to allow <br />for the anticipated production. <br />Rule 2.10.1(1) <br />The soils map should be revised at a smaller scale (ideally 1" _ <br />100'). The map should include all soil types and salvage depths at <br />surface disturbances. <br />Rule 4.05 <br />For the purposes of the Probable Hydrologic Consequences <br />Assessment, Salt Creek Mining Company should provide its best estimate of <br />future mine inflows based on past inflow volumes, drill hole information <br />and the proposed mining plan. <br />