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Subsurface drilling and testing has verified that the Derr Pit Project property contains a <br />significant commercial deposit of sand and gravel. The depth of the soil and overburden <br />ranges from less than 2.5 ft to 7.5 ft. A' tense of sandy clay exists at an approximate <br />depth of 47 feet to 56 feet and is 3 ft to 7 ft thick in a few of the borings performed by <br />Terracon in 2001. The volume of overburden removed is expected to total 300,000 <br />cubic yards mining at a 3H:1V slope. The depth of the aggregate material ranges from <br />0.0 ft to 90 ft, estimated to contain approximately 2.5 million cubic yards of sand and <br />gravel mining at a 3H:1 V slope. <br />Mining Methods <br />The deposit will be dry mined, and a slurry wall will be constructed around the perimeter <br />of the mining area between year two and year three of the mining. Design specifications <br />for the slurry wall and quality control procedures used during construction will ensure <br />that the reclaimed reservoir meets State Engineer's Office (SEO) performance <br />standards. Dewatering trenches will be excavated around the perimeter of each mining <br />area in Phases 2-7 prior to mining operations commencing. <br />The equipment and facilities may include, but are not limited to the following: <br />Processing Equipment <br />Screens, crusher, conveyors, stackers, and other miscellaneous processing <br />equipment. (The plant will be a portable setup.) <br />Earth Movinq Equipment <br />Dozers, loaders, scrapers, excavators, and compactors will be used for mining and <br />earth moving operations. <br />Miscellaneous Equipment <br />Dewatering pumps, electrical trailer, generator trailer, small portable generators and <br />watering trucks will be used as needed. <br />As mining progresses, topsoil and overburden will be stripped with scrapers to expose <br />the aggregate product below. All soil and overburden material will be used on-site for <br />reclamation; so long-term stockpiling of these materials is not anticipated. Overburden <br />and topsoil stockpiles will be located within the proposed mining area and placed so that <br />they do not impede potential floodwaters. The stockpiles will be placed outside the <br />floodplain where possible. The overburden and topsoil stockpiles will be separated and <br />stored in individual piles. <br />Mining of the aggregate will progress down to the underlying bedrock. Since <br />reclamation will occur concurrently with mining, it is not anticipated that bedrock <br />material will be stockpiled long-term prior to use if it is used in the reclamation slopes. <br />During mining and at the completion of reclamation, the mining face will have a 3H:1 V <br />slope. The aggregate material will be temporarily stockpiled near the portable plant site <br />outside the floodplain where possible until mining has progressed where stockpiles as <br />Derr Pit Project <br />J&T Consulting, Inc. DRMS 112 Permit <br />id-1