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Runoff Curve Number and Runoff <br />Project: Cottonwood Pass <br />02/01/17 <br />Location: Gunnison Nat'l Forest <br />Present <br />1. Runoff Curve Number (CN) <br />Cover description <br />Sagebrush with grass (Fair) <br />CN (weighted): 63.0 <br />Total Area: 111.159 Acre <br />Wed Feb 01 16:29:28 2017 <br />By: B Langenfeld Date: <br />2. Runoff <br />Return Period: 100 YEAR <br />Rainfall, P: 2.54 in <br />Runoff, Q: 0.2576 in <br />Runoff Volume: 2.3858 Acre -Ft <br />7. Weed Control <br />CN Soil Group Area(Acre) <br />63 C 111.159 <br />Weeds are minimal in the pre -mine site. Measures will be employed for control of any noxious <br />weed species. Control measures will also be used if growth of weed species on the reclaimed <br />area threatens further spread of weeds to nearby areas. A Weed Control Plan will be utilized as <br />follows: <br />1) Each April, a weed survey will be made of the permit area. <br />2) If any patches or plants have been identified, they will be sprayed by backpack sprayer or <br />four -wheeler using chemicals approved for use by the weed control contractor for <br />Gunnison County. <br />3) After reclamation, weed surveys and spraying will continue until the perennial cover and <br />production of the site have met DRMS requirements and bond release has been obtained. <br />The Division, US Forest Service, and Gunnison County weed control staff will be consulted <br />regarding any weed infestation area and any control measures prior to their initiation. The plan <br />does not contemplate total weed removal on the property. Past experience shows that some initial <br />weed cover in the first year following the retopsoiling is beneficial to the reclamation effort in <br />rangeland site. Weeds tend to provide shade for new grasses, are a means of holding snow on the <br />Cottonwood Pass 2/28/2017 D-3 Greg L�-k"and A tmPIAA <br />