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EXHIBIT C -MINING PLAN <br />General <br />The proposed excavation activities aze anticipated to disturb approximately 30 <br />acres of land located '/< mile north of Weld County Road 20 '/z and '/< mile west of <br />Interstate 25 in unincorporated Weld County. <br />The material to be excavated consists of alluvial sand and gravel overlain by <br />topsoil and overburden. The topsoil and overburden layer will range from 2 to 5 feet in <br />thickness, while the sand and gravel deposit is IS feet thick. The deposit is underlain by <br />shale. The depth of excavation will be on the order of 20 feet. <br />Groundwater is approximately 6 feet below natural ground level. The deposit is <br />therefore classified as an alluvial deposit. The sand and gravel deposit is cataloged in the <br />report Sand, Gravel and Quarry Resources, Colorado Front Range Counties (Colorado <br />Geologic Survey, 1974). <br />Mining Method <br />The Camenish Borrow site will be dry mined. A dewatering ditch will be <br />excavated to bedrock around the perimeter of azea to be excavated and groundwater <br />pumped from the borrow site. Groundwater recovered in the dewatering ditch will be <br />discharged in accordance with Colorado/NPDES dischazge permit regulations. <br />Topsoil and overburden will be placed in temporary stockpiles within the mining <br />area limits. Topsoil and overburden will be salvaged and stockpiled sepazately. <br />The deposit will be mined using a backhoe and front-end loaders. Excavated <br />material will be loaded directly into haul trucks and transported to the I-25 job site. <br />Access to and from the site will be via an existing farm road. <br />Mining Schedule <br />The I-25 project calls for 500,000 cubic yards of fill material. Flatiron will <br />excavate and haul approximately 50,000 cubic yazds of fill per month beginning <br />November 2006 and ending the following November. <br />