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SEDCAD 4 for Windows <br />r,..„m~n, woo oo..,vie i c~n..,en <br />J <br />~I B Excess Materi <br />Rec/aimed Configuration See Map 18 <br />RipRap Ditch & Terrace Ditches <br />it <br />This design is for postmining drainage control that will be constructed in the foot print of the Portal B excess <br />material stockpile after the stockpile has been excavated and placed in the B-Seam Portal. The entire <br />drainage area for the riprap channel was used to develop a peak flow of 2.3 cfs. The terrace ditches are sized <br />separately from the riprap channel based on the largest terrace ditch drainage area, 0.18 acres disturbed. <br />No flow contribution comes from the mixed shrub upland area. The terrace ditches and riprap channel are <br />shown on Map 18 Postmining Contours. Section M-M shows the size of the riprap channel. The terrace <br />ditches are V-ditches 0.5 feet deep with 1.SH:1 V side slopes. <br />The calculations and informatio a following pages, EXH-8 -191 through 196 were prepared <br />by me during the month of Au ~ formation presented is true and correct to the best of my <br />knowledge and belief. ~~o~';' ~ fO :~Fa <br />• <br />•v•~ G ~ <br />~ :~ ~ • <br />~*~~ i ~ ~ *~ 8 ii o3 <br />:°.d~mes E. Stover. P.~'! to <br />]im Stover <br />J. E. Stover & Associates <br />2768 Compass Drive, Suite 101 <br />Grand Junction, CO 81506 <br />Phone: 970-245-4101 <br />Email: jestover@attbi.com <br />Filename: PortBStockpile.sc4 <br />TR-~7 iiiPRoveD ~~~-203 <br />C-kh8-t9( <br />Printed 08-13-2003 <br />