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6.4.4 Exhibit D <br /> Mining Plan <br /> The Clayton Pit is a new site that will span 101.684 acres. The target gravel source is <br /> located beneath limited topsoil and overburden. The primary commodities are sand and gravel. <br /> Incidental materials not used for construction material will be used to reconstruct the pit floor <br /> and lessen the pit slopes. A portable asphalt or concrete batch plant may be onsite as projects <br /> warrant. <br /> The life of the proposed operation is speculative due to fragile economic conditions in <br /> the construction industry. If economic demands remain low and extraction is limited to 70.000 <br /> tons per year, approximately six acres per year would be mined. At this rate,the life of the <br /> mine would extend to approximately 8 years. <br /> Mining will proceed from the southeastern corner of the pit and will move north and <br /> west. Extracted material will be moved to the processing area that is anticipated to be located <br /> in the northeastern portion of the pit denoted on the map. Earthmoving will be accomplished <br /> using bulldozers,front end loaders and/or scrapers depending on the depth of plant growth <br /> material and overburden. All plant growth material and topsoil will be salvaged and stockpiled <br /> for reclamation use. Front end loaders will be used for mining at the site. These stockpiles will <br /> be located at the perimeter of the site and posted as reclamation topsoil. Waste rock and <br /> overburden will be stockpiled and used to rebuild the pit floor and slopes during reclamation. <br /> Overburden perimeter stormwater diversion berms will be constructed as excavation and <br /> reclamation progresses. <br /> Mining will develop a gravel pit to a depth of approximately 30 feet. No groundwater is <br /> expected to be encountered during excavation and mining;therefore, no impact to the <br /> hydrologic balance is anticipated. No acid or toxic producing materials will be exposed during <br /> mining. No explosives will be used in conjunction with mining or reclamation. Mining will go to <br /> just outside the 25-foot guidance that was given in the engineer's report. Lamar Light and <br /> Power asked that an engineer give direction on how mining should occur around their <br /> structures in lieu of a Structure agreement. This report is attached for your review. <br /> The proposed mining operation will consist of an access road from the northeast of the <br /> site. Aggregate will be processed and sized using a crusher and screens. All interior haul roads <br /> will be temporary and will be reclaimed after the mining has been completed. It is estimated <br /> that the life of the pit is 8-10 years and is dependent upon demand. <br /> Comments were solicited from the Colorado State Historic Preservation Office (SHPO). <br /> This is attached for your review. <br />