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discharged to the South Platte in accordance with Colorado/NPDES discharge permit <br /> regulations. <br /> Prior to dewatering mining stages 4-7, a soil-bentonite slurry wall will be installed around <br /> the perimeter of each mining stage. Once the slurry wall in place the stage to be mined will be <br /> de-watered and mined. With the slurry wall in place prior to pit de-watering, adverse impacts to <br /> nearby groundwater wells will be avoided. <br /> Topsoil and overburden will be placed in temporary stockpiles within the mining area <br /> limits. Topsoil and overburden will be salvaged and stockpiled separately. Approximate topsoil <br /> and overburden stockpile areas are shown on the Mine Plan Map. <br /> The deposit will be mined using scrapers and front-end loaders. Excavated sand and gravel <br /> will be discharged to a field conveyor system for transport to the on-site processing plant located <br /> on the west side of Morton-Holton Stage 6. Additional conveyors may be used inside the mine <br /> areas to facilitate transport of the resource. <br /> All sand and gravel will be transported by conveyor to the sand and gravel processing plant <br /> located on mining Stage 6. <br /> Primary access to and from the Morton Lakes operation will be via an access road from <br /> Holton Lakes to Colorado State Highway 52. Haul trucks to and from the site will use Highway <br /> 52 only. The Highway 52 access road intersection has been upgraded per C-DOT Permit No. <br /> 414080 (see CDOT"Certificate of Acceptance" in the appendix to this Amendment <br /> Application). <br /> 5.3 Mining Schedule <br /> Mining is currently projected at an average rate of 1.5 million tons/year, depending on the <br /> economy. Based on an estimated reserve of 18 million tons and an average mining rate of 1.5 <br /> million tons per year,the Morton sand and gravel reserves will last approximately 12 years. Pre- <br /> Mining and mining activities commenced in 2015 with sand and gravel processing plant <br /> operations scheduled to begin the spring of 2016. <br /> Note: The order(sequence) in which the Morton-Holton mining stages are mined is subject <br /> change without notice. <br /> 5 <br />