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J <br />SEDCAD 4 for Windows <br />d B Excess Material Stockpil <br />Reclaimed Configuration See Map 18 <br />RipRap Ditch & Terrace Ditches <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 1.51-1:1 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 At 9 formation presented is true and correct to the best of my <br />knowledge and belief. 4.o�;' f0 :�Fa <br />4 G <br />• <br />:°. Ani&s E. Stover. <br />Filename: PortBStockpile.sc4 <br />TR -.-v7 1VPAovc5 !R-I--2Io3 <br />Jim 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 />Ckhf,-(9( <br />Printed 08 -13 -2003 <br />