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<br />9. CONCLUSIONS <br /> <br />The SEDCAD+ demonstration'quantifies the runoff anticipated from the various watersheds fora 10-year 24 <br />hour storm event, and identifies the minimum size of ditches required to convey the runoff to Sedimen[ Pond <br />MB-3. The demonstration also quantifies the sediment loading expected to be discharged into the Pond. <br />CERTIFICATION <br />This certification is limi[ed to office design, based on physipl descriptions and site conditions <br />information provided by Kathy Welt, Environmental and Engineering Supervisor, West Elk <br />Mine, Mountain Coal Company, Cathy liegej, Greystone; and other sources of information <br />as referenced in the above documentation (primarily from previous SEDCAD+ demonstra- <br />tions). The analysis is widety accepted engineering practice, and conclusions reached, based <br />on the information provided, are valid to the best of my knowledge. <br />• <br />• <br />$yio G. Walker, P.E. <br />- Colotzdo Registration Number 18378 <br />' Da:e _~ a /is P <br />7 <br />