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6. Post-Reclamation Site Drainage <br />The site will contain a 24 hour 100 year event. The stormwater isolation berms and sump will <br />hold back the water producing a shallow pool. The stormwater will be allowed to infiltrate <br />through a porous floor. No drainages enter the site, therefore a diversion ditch will not be <br />needed. Stormwater will sheet flow down the side slopes (3H:1 V) until it hits the pit floor where <br />it will collect behind the isolation berms or in the sump. <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 if growth of weed species on the <br />reclaimed area threatens further spread of the weeds to nearby areas. A Weed Control Plan will <br />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 />During the removal of overburden, if an area of heavy seed infestation is encountered, it will be <br />buried in the slopes rather than used as a growth medium. During all phases of the mining <br />Mott pit, March 2009 D-4