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k. No toxic or acid-forming materials will be used in material processing or as backfill <br /> material.This will prevent leaching of acids into the ground water. If any unknown <br /> refuse, acid-forming or toxic producing materials are inadvertently mined,they shall be <br /> managed and disposed of in a manner that will control unsightliness and protect the <br /> drainage system from pollution. <br /> 1. No explosives will be used in conjunction with mining or reclamation. <br /> B—Earth moving, Mining and Equipment <br /> 1. Materials-The mining of construction material including rock,sand, and gravel for use in the <br /> production of non-metallic construction products. <br /> a. Topsoil—The mining operation will strip topsoil to expose the underlying raw aggregate <br /> material deposit.Topsoil storage is shown on Exhibit C Mine Plan Maps.The volume of <br /> topsoil for all the mining phases is±188,000 tons or±1,500 tons per acre of topsoil.The <br /> depth of the topsoil ranges from six(6) inches to twelve (12) inches over the mining <br /> area.Striping of the topsoil for phase 1,2, and 3 and is stored in the mine buffer along <br /> the south boundary of phase 1,2 and 4 in the flood plain and outside of the excavation <br /> area.Topsoil storage stockpiles are±15 ft high for use in future reclamation activities. <br /> Topsoil stockpiles will have vegetative stabilization seed mix applied to the surface. <br /> b. Overburden—Overburden material will be used to backfill earlier mine excavation areas <br /> and reclamation.Overburden stockpiles will be found within the various mining blocks. <br /> The volume of overburden for all the mining phases is±1,125,000 tons or±9,000 tons <br /> per acre of overburden.The depth of the overburden ranges from 2 to 4 feet over the <br /> mine area. <br /> c. The overburden material is a part of the mine backfill.When mining operations call for <br /> overburden materials to be stored over a year,an employee will seed the stockpiles <br /> with a reclamation seed mix.This will minimize erosion prior to use in mine reclamation. <br /> d. Crusher fines,wash plant fines and clean inert material will be used to backfill the mine. <br /> e. Recyclable Aggregate Materials— <br /> i. Asphalt paving fragments shall be diverted to the aggregate recycle material <br /> operation. It is expected that minimal amounts of small asphalt fragments may <br /> be placed in the backfill.Concrete and concrete pieces shall be diverted to the <br /> aggregate recycle material operation. It is expected that minimal amounts of <br /> small concrete pieces may be placed in the backfill. <br /> ii. Any concrete received will be hardened for at least 60 days prior to acceptance, <br /> with most of the imported concrete coming from demolition jobs that has been <br /> in place for years prior to removal and acceptance at the site.Only hardened <br /> asphalt fragments,typically from portions of asphalt parking lots or street <br /> replacement,will be received.All asphalt and concrete will be diverted to the <br /> aggregate recycle material operation. <br /> f. inert Backfill Materials-All backfill materials received shall be only clean, native, <br /> natural,and non-contaminated. Please refer to the reclamation plan. <br /> 2. Buffers—Mine buffers vary from 50 to 250 feet in width.The mine buffers will be kept and may <br /> be used for reclamation stockpiles and surface ditches.There are various setbacks will be kept <br /> during the mining operations from residential structures,out buildings,adjacent roads, <br /> structures, utilities and oil and gas infrastructure.The mining boundary line is subject to change <br /> as specific soil conditions may require adjustment. DRMS will be notified of any adjustments to a <br /> mining boundary line. <br /> H:\Pits HBP Plants\EVANS\Stiles Mining Resource\Exh D-Mine Plan\Mine Plan Draft.dom <br />