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Weeds in the re-vegetated areas will need to be controlled by mowing until grasses are <br />established, usually the first four years after planting for native species. Again, the applicant <br />should coordinate weed control with Ron Broda, Vegetation Weed Management Specialist with <br />the Weld County Public Works Department. <br />Surface and Subsurface Water <br />The Platte River Conservation District, along with others in the area, is concerned about the <br />overall loss of water resources, both swface and subsurface, due to mining operations such as <br />this. There are concerns relative to the effect this mining operation may have on underground <br />aquifers in the region. The applicatiott indicates that slurry walls will be installed azound the <br />perimeter of the reservoirs to seal them What will be the impacts of any water "shadowing <br />effects" downstream of the reservoirs? There are numerous wetlands downstream of the <br />proposed mining operation on the adjacent South Platte River and on tributaries to the river. <br />What will be the short and long-term impacts to these existing wetlands? The swface area for <br />the proposed water storage reservoirs will be large. What will be the long-term, annual <br />evaporative water loss from these reservoirs? <br />The NRCS and Platte River Conservation District welcome the opportunity to review and <br />comment on this proposed mining and reclamation permit amendment. Should you have <br />questions, the I~lRCS can be reached at 303-659-7004. <br />Sincerely, <br />f~-~ <br />Jan Fritch <br />District Conservationist <br />6 ~~~ <br />Ken Koebel <br />Conservation Technician <br />