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<br />Revised 1/11/80 <br />Section 780.21 Continued <br />The drainage systems on top of the excess spoil structures are <br />r 1 <br />U <br /> <br />described in detail in F~chibit 9, ESccess Spoil, and consist of maintain- <br />ing a gradient that will prevent the impoundment of water on the spoil, <br />thereby minimizing possible leaching. These drainage systems will trans- <br />mit crater off the spoil in a manner that prevents erosion and TSS loading <br />of surface water. This will be accomplished by maintaining an even and <br />consistent gradient and by installing riprap or other energy dissipators <br />where necessary. All drainage from the surface of the spoil will be <br />diverted away from the outslope of the fill. F~chibit 9, page 27, reconr <br />mendation number 11 addresses the drainage system on the top of the <br />excess spoil piles. The intent of the recommendation is that the point <br />of intersection of the outslope with the top of the fill be the highest <br />portion of the excess spoil pile. Asa result of the recormpndation that <br />the central portion of the fill be overbuilt approximately 5 percent, the <br />water collecting on the top surface of the fill will flow to the edge of <br />the fill and down the permanent diversion ditch. <br />780-156(b) <br />