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3 <br />For re-vegetation in the wet meadow areas, field experience has shown that individual plants <br />provide a much higher success rate and it is highly recommended that pLurts be used in these <br />areas to accarrrpiish re-vegetation. The applicant proposes to re-vegetate the wet meadow areas <br />with a mix consisting of 72 % Rocky mountain iris. It is recommended that this be reduced to 5- <br />14% and the other proposed wethurd plants be increased, or new wetland plants be added. <br />We recommend mulching re-vegetated areas with clean weed-free straw or native hay. It should <br />be applied at a rate of 4,000 pounds per acre and crimped into the sor7 to anchor it. Crimping <br />should be cross slope or on the contour, if possible. The State of Colorado has a lisle of certified <br />weed-&ee straw avar7abie on the Internet or it can be obtained through local cou~y extension <br />service offices. AIl surface water should be diverted away from the re-vegetated slopes to a <br />point where it eau safely flow down slopes without the potential of serious sotl erosion <br />Weeds in the re-vegetated areas wr11 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 Kelly Uhing with the Adams County Cooperative <br />Extension. . <br />Surface and Snbsarface Water <br />The West Adams Conservation District, along with others in the area, is concerned about the <br />overall loss of water reso»*s~, harth surfaces 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 application indicates that a slurry wall will be installed around the <br />perimeter to seal the reservoirs. What will be the impacts of soy water "shadowing effects" <br />downstream of the reservoir? There are numerous wetlands downstream of the proposed mining <br />operation on the adjacent South Platte River and on tributaries to the river. What wr71 be the <br />short and long term impacts to these existing wetlands? The surface area for the proposed <br />reservoirs is large at approximately 167 acres. What wr71 be the long-term, annual evaporative <br />water toss from the reservoir? <br />The MRCS and West Adams Conservation Bistrict wdi be available to review this proposed <br />mining and reclamation permit application again after the above concerns have been addressed <br />Should you have questions, the NRCS can be reached at 303-659-7004. <br />Sincerely, <br />T <br />Jan Frit <br />District Conservationist <br />K,en Koebel <br />Conservation Technician <br />