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Introduction <br />The following SIDC'AD meter printouts were based on typical sections of <br />the diversion ditches around or near the office and boneyard areas. The <br />ditches were constructed in the early to mid 1980's. All of the ditches <br />were constructed to intercept runoff for either prelaw areas or areas <br />undisturbed by mining and carry the runoff around the above mentioned <br />facilities. With the exception of the lower reach of the Office Ditch, <br />the ditches for the most part have been functioning with little or no <br />maintenance. The attached is provided to verify that the ditches can <br />handle the _runoff from the 10 -year, 24 hour precipitation event. One <br />additional diversion is entered into the category of existing diversions. <br />'This would be the diversion ditch in the Wadge Pit Area that was <br />constructed to convey runoff into Pond 008. The ditches are shown on <br />Mdiibit 7 -7, Surface Hydrology Map. <br />Prelaw Diversion Ditch <br />This ditch was constructed to carry the runoff frcan the drainage area <br />north of the. old Wolf Creek mining area. 9his watershed. contains <br />approximately 894 acres. The heavy ground cover in this area keeps the <br />Peak discharge low and therefore allows the diversion ditch to be of <br />reasonable size, generally three feet deep and seven to eight feet wide at <br />the top. <br />Runoff from this area flows into the pond above the old boneyard. This <br />ditch appears to be stable in its present condition. Please refer to <br />attached SM= printouts for further information. <br />New Boneyard Diversion Ditch <br />A diversion ditch will need to be constructed (reconstructed) at the SWF <br />location. This is the location fram which snow is pushed out of a <br />secondary gate, causing erosion. The flow is very low (0.34 cfs) at this <br />7 -6 -3 -8 Revised 08/20/93 <br />