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-20.00 16.28980 26280.9 709583.7 5.619 <br />-17.00 33.55641 54137.7 1461717.3 5.933 <br />-14.00 51.76407 83512.7 2254842.7 6.246 <br />-11.00 70.92018 114417.9 3089282.8 6.565 <br />-8.00 91.04020 146878.2 3965711.1 6.892 <br />-5.00 112.15204 180938.6 4885342.7 7.227 <br />-2.00 134.27763 216634.6 5849133.7 7.570 <br />0.00 149.63559 241412.1 6518126.2 7.777 <br />The analyses shows a resulting volume of 241,000 total cubic yards removed to a depth of 23 feet at <br />a mining grade of 2H:1 V. Subtracting an average of 2.5 feet of overburden and soil over an area of <br />7.78 acres results in a volume of 31,000 cubic yards. Additional subtractions for portions of the ex- <br />isting pond and the existing depression azea are approximately 20,000 cubic yazds. Therefore, the <br />total gravel volume to be mined is 190,000 cubic yards. This is equivalent to 285,000 tons. These <br />calculations are approximate since the exact extent of the gravel deposit in the field is unknown. <br />Note: Since the COE has required an individual wetland permit in order to mine through the exist- <br />ingpond, the mining quantities described above are slightly higher than expected since the pond is <br />being eliminated from the mining area for the existing pond. The actual extent of mining is shown on <br />the revised Map E-1. If a later COE individual permit is obtained, mining will proceed exactly as <br />shown in this plan. The maximum annual mined tonnage rate for the pit is 70,000 tons, therefore, the <br />mine azea will last approximately 4.1 years, assuming the maximum rate is sold each year. The min- <br />ing of the area will leave 2.OH:1.OV sideslopes on all final outside slopes down to the mining depth. <br />In fact, during the mining process, the dozer will mine the deposit at a 2H:1 V slope, therefore, the <br />worst case bond calculations for reclamation will simply involve backfilling to 3H:1 V, replacing <br />topsoil, then seeding. _ <br />No mining will be conducted at night. Mining will only be allowed from 6 am to 7 pm, Monday <br />through Saturday. No processing of any kind will occur on the North Fork Pit site. All material will <br />be mined with a front end loader and trucks will take the raw material over a flat car bridge to the <br />processing azea of the River Bottom Pit. The majority of the material will be mined, crushed and <br />sold in the spring, summer and fall months. There will be no fence around the operation, since it is <br />well inside private property and there aze no facilities on site. No problems are expected with van- <br />dalism. Access to the site is from 4005 Lane, which is a County Road. The mine sign will be posted <br />at the end of this road, adjacent to the Pit entrance. <br />It is extremely unlikely that any toxic or acid-producing materials will be encountered during the <br />mining operation since the total depth of excavation (20') is shallow and tests down to this depth <br />show that the material is alluvial in nature. However, in the event that such materials aze encoun- <br />North Fork Pit Mazch 04 16 <br />