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Bureau of Land Management Appendices <br /> Royal Gorge Field Office DOI-BLM-CO-F020-2020-0036 EA <br /> approximately 2 ft across the bottom, with depth <br /> of I ft, and side slopes of 1.51-1:1.OV maximum. <br /> Culverts - One or two culverts will be installed <br /> along the access road,to convey runoff to the <br /> swale reporting to the sediment pond. Culverts <br /> (corrugated, galvanized pipe)may be 1 ft or <br /> larger in diameter, of sufficient length and depth <br /> under the access road, and angled to provide <br /> positive drainage from the ditch side toward the <br /> swale side of the road. <br /> 4. Mining Operation <br /> a. General <br /> overview of Ref. sections below Y N N _ <br /> process <br /> b. Operations, 8000 Tons per month, 2000 Tons per week, 400 <br /> production rates Tons per day. Product percentage is expected to <br /> and mining be close to 100 ;very little volume or - N N <br /> methods percentage will be lost due to the handling of or <br /> contamination by non-obsidian materials. <br /> Blast Plan - approximately 60#per delay <br /> maximum explosives. Air blast will be <br /> dampened, and noise levels will be reduced <br /> since mining will be increasingly below ground <br /> level. Ridge on the south side of the pit aids in <br /> c. Blasting buffering and visual screening. Drilling will be Y N <br /> Program 20-ft depth, and average shot to be 40+/-holes. N - <br /> Materials consist of primers, anfo, ecord and <br /> surface delays. Pounds per delay will be <br /> determined for this material. All MSHA <br /> regulations are followed. Existing operation <br /> utilizes a proven blasting program,which will be <br /> A-10 <br />