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Roadside North Portal Reclamation Drainage . <br />Emergency spillway is a trapezoidal channel four feet wide at the bottom <br />1.5H:1 V side slopes, 1.5 feet deep, 9" and12" Dso riprap, invert elevation 4788 <br />(pages 14-6-63 & 64). <br />The silt fence will be constructed on the contour down gradient of all run-off. The <br />peak stage for the silt fence is 0.84-feet (page 14-6-71). Therefore 1.5' high <br />berms will be utilized to collect and direct run-off to the silt fence. <br />The height of the berms that collect and convey run-off to the sediment pond <br />was calculated (page 14-6-65). Minimum design height is 1.06 feet. Therefore <br />1.5' high berms will be utilized to collect and direct run-off to the sediment pond. <br />ENGINEER'S CERTIFICATION <br />~,....• <br />The SEDCAD calculat~ •• ~,~~im~otion presented on pages 14-6-53 through 14-6- <br />73 were prepared by~e~,~hrir`tg &~th of November 2000, and the information <br />presented is true ar$ect to the`~ggt~of my knowledge and belief. <br />A <br />23 ~*~ ~ <br />f •~~,eQ~aC~ ~~ L/ ~ <br />~o'•,lames E. ySfc~?r, P.E. ate <br />R~~~red•P (~cSional Engineer <br />Stat9'$f'1'..1~1~~'ado No. 19230 <br /> <br />14-6-54 (New 11/00) <br />