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• 12 • EXHIBIT D MINING PLAN 112 PERMIT M-94-011 CONV WEST END GRAVEL PIT No.t NEST END GRAVEL COMPANY SEK SEC 11. T46N. R15W. NMPM As before with the preceding 110 Permit plan and with all continuing operations at this site, topsoil shall initially be stripped from each mining unit in rum and stockpiled with a wheeled scraper and tracked bulldozer. Extraction of gavel shall be with a tracked bulldozer-ripper and wheeled front-loader, with pit-run material extracted to be placed directly into the feeder for the crusher and screening processing within the current process area of the worked-out pit. Processing at this site shall include crushirtg, screening, and washing of sand and gravel products with the appropriate equipment, which is permitted by the Air Pollution Control Division of the Colorado Department of Public Health and Environment. Uther acti<ity at this permitted site shall include the storage of construction materials, equipment, vehicles, and petroleum fuels. No hazardous materials nor explosives shall be stored upon the site. All remaining finished headwalls bordering the finished pit shall be excavated to and finish graded at no steeper than 3-horizontal to 1- vertical (3V:1H). Processed rock products are conveyed with belted conveyors behveen process operations and to com•eyor-stackers to temporary stockpiles. Transport off-site to azea markets is by dump trucks loaded from stockpile with wheeled front-loaders. The site has a current implemented Stormwater Plan and Certification under the Colorado General Stormwater Permit, which shall be amended to include each additional portion of this site at the appropriate time. Mining shall continue in the northwest corner of the currently permitted (110) permit area starting from the north edge of the current worked-out pit process area and extending to the north at the expected 2~- to 30-foot full depth of the 0.8-acre gravel bar deposit. Any salvageable surface soil with grassy vegetation included shall be preciously stockpiled with the existing topsoil stockpile just north of the central access road. Only a few inches of soil is available in this dry rocky azea of the site. Gravel deposits in this area (the north- central extraction unit) shall be accessed from the west end of the current topsoil stockpile and shall be mined to the north and west to the central drainage arroyo. The excavation shall be "daylighted" to the central arroyo, that is, excavated out through the canyon wall at grade level of the pit floor, along the east edge of this unit. Completion of extraction from this unit shall essentially complete the mining in the originally permitted (110) portion of the site east of the central drainage arroyo. Hitting there is expected to be completed in the fall of 1997. Two '/..-acre water empoundments are presently utilized as settling ponds in the central north-to-south drainage arroyo and shall continue in that employment. Discharge is controlled at each pond outfall by silt fence, per the Stormwater Plan. Another '/~-acre pond is incorporated in Doing i_ •o lion ditch, and was used traditionally as a stockwater