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Revised 1/11/80 <br />• Section 780.21(b) Continued. <br />194. Figure 32, p. 780-153, has been revised to show the <br />new average CN, runoff volume and peak discharge (100 <br />year - 24 hour). Backup calculations have been added to <br />Appendix C which has been added to Exhibit 13. <br />Ditches were re-sized in accordance to the instructions <br />given in the above reference. Plate I, Sedimentation <br />Ponds, Energy Mines No. 1 and 2, and Eckman Park found in <br />Exhibit 13, has been revised accordingly. Ditch depths <br />were increased from 0 to 0.3 feet. Backup calculations <br />have been added as a Supplement to Appendix B of Exhibit <br />• 13 in the "Ditches" section. <br />Strategic placement of small check dams is another impor- <br />tant measure which will be utilized to reduce runoff and <br />sediment yield. Check dams wil be placed in draws and <br />gullies wherever and whenever needed to provide local <br />control on an individual basis. By using numerous check <br />dams, significant cumulative control of runoff and sedi- <br />ment yield will be provided on a collective basis. Prob- <br />lem areas such as unexpected gully erosion, increased <br />runoff or unanticipated soil loss and sediment transport <br />• <br />780-151(b) <br />