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Slopes will be reclaimed at a 3:1. The final lake, Reservoir II, is anticipated to have a capacity of <br />815 acre-feet. <br />Phase III <br />Phase III comprises of 22 acres to the southeast of Phase II, although only approximately 10 <br />acres will be mined. A slurry wall will be located around Phase III and will also encompass <br />Phase IV. This will be installed prior to mining and will reduce or eliminate dewatering efforts <br />during mining activities. The specifications outlined by the SEO and recommended by the <br />DRMS for slurry wall construction will be followed, The primary resource mined from Phase III <br />will be sands and gravels. The material is anticipated to be between 15 and 25 feet deep. It is <br />anticipated that mining will be complete by 2012. The reclaimed use will be developed water <br />storage. It is anticipated that the final reservoir, Reservoir III, will have a capacity of 135 acre- <br />feet. <br />Phase N <br />Phase IV includes 30 acres to the east of Phase II and north of Phase III. Mining of <br />approximately 22 acres is anticipated to be complete by 2021. It is anticipated that a slurry wall <br />will be constructed around Reservoirs III and IV prior to mining. The proposed amendment <br />would change the reclaimed use of Phase IV to developed water storage. The anticipated storage <br />of Reservoir IV is 370 acre-feet. <br />Mining Methods <br />The mining, although completed in phases, will employ similaz methods. The major difference <br />is that Phase II will be completed before lining has occurred requiring trenches and pumps to <br />control the water during mining operations. Phases III and IV however will be mined after the <br />construction of a slurry wall and minimal water control will be required. <br />The aggregate material will be recovered using equipment and facilities typical for sand and <br />gravel mining operations. The equipment used for mining operations may include, but aze not <br />limited to: dozers, loaders, scrapers, excavators, and compactors. A portable crusher will process <br />the material. <br />As mining progresses through each phase, topsoil and overburden will be stripped to expose the <br />aggregate product below. It is anticipated that soil and overburden material will be used for <br />reclamation, so long-term stockpiling of these materials is not anticipated. <br />Mining of the aggregate will progress down to the underlying claystone bedrock. The bedrock <br />material is rippable and, when necessary, will be excavated and used for reclamation. However, <br />since reclamation will occur immediately following completion of mining for Phase II and <br />concurrent with mining in later phases, it is not anticipated that bedrock material will be <br />stockpiled long-term prior to use. The later phases may need to use bedrock to reclaim slopes, if <br />overburden material is limited. <br />Weld County Hokestra Prt <br />DMG 172 Pesmit Amendment <br />Page 5 <br />