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SOIL STABILIZATION PLAN <br />• Colorado Yampa Coal Company's soil stabilization plan has been modified to <br />incorporate the rill and gully plan and clarify changes of the soil <br />stabilization plan. These modifications are a result of the mid-term review <br />and technical revisions. As presented, the plan is divided into four <br />sections: Soil Stabilization Plan; Plan to Reclaim Excessive Rilling and <br />Gullying; Permanent Drainageway Construction; Permanent Drainageway <br />t4aintenance Plan. All of the above are explained in further detail within <br />Exhibit 2S, Rill and Gully Plan, of the C-81-071 permit. <br />Part 1: Soil Stabilization Plan <br />The major components of the soil stabilization plan include chisel plowing, <br />seeding, and contour furrowing or ripping. Mulch will not be applied as <br />approved by the 16 May 1585 minor revision. The exception to the <br />application of mulch involves topsoil treated with the 1ladge rotoclear. <br />Such material already contains a natural mulch. <br />• The soil stabiiization practices will be completed in the same field season <br />if topsoil is redistributed in the summer or fall. In the event of winter <br />topsoaling, when all activities can not be accomplished prior to major <br />snowfall or freeze up cf topsoil, CYCC will implement contour furrowing or <br />rippi after op i application. Any remaining activities will be <br />completed as soon as practical during the first normal planting seascn (as <br />required by OSF1 special stipulation). <br />Tfie guidelines for construction of contour furrows are as follows: <br />The frequency and depth of contour furrows and the frequency of check <br />bridges in individual furrows is determined primarily by: <br />1. Magnitude of runoff from design precipitation event. <br />2. Topographic slope. <br />3. Drainage area above area to be ccntour furrowed. <br /> The principle of contour furrowing is to increase depression storage to the <br />• extent that the runoff from the design may be completely contained. <br />Permit Renewal 780-129-1 Revised 10/29/87 <br />