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o17FICe, BoNES¢~D APID FTADGE <br />DIVIIiSIGYd DI'ICS-IE5 <br />Intirociuction <br />The following SFDCAD o~Iter printouts were ba-secl on typical sections of <br />the diversion ditches around or near the office acid boneyard areas. The <br />ditches were ~ in the early to mid 1980's. All of the ditches <br />were constzcted to i.trtezroept runoff for either prelaw areas or areas <br />undisturbed by mining and cazxy the runoff aranYl the above mentioned <br />facilities. With the exception of the lacer reach of the Office Ditch, <br />the ditches for the most part have been functioning with little or no <br />maintenance. 4he attached is provided to verify that the ditches can <br />handle the runoff fran the 10-year, 24-hour precipitation event. One <br />additional diversion is entered into the category of existirq diversions. <br />Zhis would be the diversion ditch in the Wadge Pit Area that was <br />oortstructed to convey runoff into Ford 008. The ditches are sham on <br />Dchibit 7-7, Stn-face Hydrology Map. <br />Prelaw Diversion Ditch <br />this ditch was constructed to carry the runoff frcvn the drainage area <br />north of the old Wolf Creek mining area. This watershed contains <br />approximately 894 acres. 'Ihe heavy grourxi Dover in this area keeps the <br />peak discharge low arri 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 fran this area flows into the pond above the old boneyard. Zhis <br />ditch appears to be stable in its present condition. Please refer to <br />attached SIDCAD 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 frmn which snow is pushed out of a <br />secondary gate, causing erosion. 'ihe flow is very law (0.34 cfs) at this <br /> <br />7-6-3-8 Revised 68/20/93 <br />