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If a significant invasion of noxious weeds occurs after seeding, the weeds will be mowed before <br /> they can go to seed. The areas will be mowed periodically for additional control as needed. <br /> Mechanical control will be used as a first priority. Chemical methods will only be used if no other <br /> alternative produces acceptable results. See Exhibit J for specifics of the weed control plan. <br /> For temporary earthen stockpiles, the reclamation plan includes re-vegetating with appropriate <br /> seed mixes to minimize erosion and establish more rapidly to stabilize the stockpiles. If a <br /> temporary earthen stockpile remains more than one growing season, it will be seeded with the <br /> seed mix above to prevent erosion. <br /> Water—General Requirement <br /> To minimize the effect on the prevailing hydrologic balance, CCWCD will: <br /> a. Comply with all applicable Colorado water laws. <br /> b. Comply with all applicable Federal and State water quality laws and regulations. <br /> c. Comply with all Federal and State requirements for dredge and fill. <br /> d. Re-grade and backfill all sediment and siltation structures after mining is completed. <br /> e. Monitor groundwater levels adjacent to the site and mitigate any damage to adjacent <br /> wells that dewatering activities may have. (See Exhibit G) <br /> Groundwater—Specific Requirements <br /> The operation will not affect groundwater quality on or off the site. The operation will comply <br /> with State groundwater quality standards. <br /> The mining and reclamation may affect the groundwater table surrounding the mine site. The <br /> proposed mitigation efforts to minimize these impacts are ditches in necessary areas to <br /> maintain groundwater levels during the mining, and dewatering wells or a perimeter drain if <br /> needed to convey groundwater around the lined reservoir after the pit side liner is installed. A <br /> ground water model by McGrane Water Engineering, LLC has also been provided and the <br /> results indicate that water levels will be affected by +1 to +3.5 ft without mitigation measures <br /> and with mitigation measures there is not any mounding occurring that affects any wells by <br /> using dewatering wells to manage the mounding. On the shadow side (north) of the slurry wall <br /> there would be a drop of 3.5 feet adjacent to the wall, however there are other gravel mines for <br /> Monarch and Section 20 that have been approved and the wells within the predicted water level <br /> change are all within their mining areas so the overall impact of the slurry walls will be <br /> insignificant. CCWCD proposes that they monitor groundwater levels through monitoring wells <br /> that they have installed, or have access to before, during, and after the mining and reclamation <br /> is complete so that impacts to the groundwater table, from this mining operation, can be <br /> identified and addressed. It is the intent of CCWCD to operate responsibly and to mitigate any <br /> damage to wells that is directly attributable to the mining and reclamation of this site. <br /> q)■ Central Colorado Water Conservancy District <br /> J&T Consulting,Inc. <br /> Sweet Valley Pit <br /> DRMS 112 Permit Application <br />