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• 6. Post-Reclamation Site Drainage <br />The site will contain a 24 hour 100 year event. The stormwater containment berms will hold <br />back the water producing a shallow pool. This pool will quickly dissipate into the porous pit <br />floor. No drainages enter the site, meaning a diversion ditch will not be needed. Stormwater will <br />sheet flow down the side slopes (3H:1 V) until it hits the catch benches spaced every 20 vertical <br />feet. (8' wide, 2 % slope back to the hill, with small depressions). The depressions on the catch <br />benches will collect the runoff from the above slope, which reduces the chance of gulling on the <br />lower portions of the slope. <br />7. Weed Control <br />Weeds are extremely low in the pre-mine site. Measures will be employed for control of any <br />noxious weed species. Control measures will also be used is growth of weed species on the <br />reclaimed area threatens further spread of the weeds to nearby areas. A Weed Control Plan will <br />0 be utilized as 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 />4-wheeler using chemicals approved for use by the weed control staff of Montrose <br />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 and Montrose County weed control staff will be consulted regarding any weed <br />infestation area and any control measures prior to their initiation. The plan does not contemplate <br />total weed removal on the property. Past experience shows that some initial weed cover in the <br />first year following the retopsoiling is beneficial to the reclamation effort in dry range site. <br />Weeds tend to provide shade for new grasses, are a means of holding snow on the seedbed longer <br />and protect it from wind and water erosion until the planted species have taken hold. <br />• <br />Pinion Ridge Pit, June 2008 D-4