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adjacent —) Dutch Creak .lie sediment Do-ads will be located <br /> abOVe tn1 100-17c2ar - 10OJD111n The ponds are designed for a <br /> 10-year _'4-dour storm event . <br /> `fine waters and surface runoff waters <br /> from the disturbed area , including the rock-disposal area , <br /> will be channeled to the settling ponds via a 2 , 800 foot- <br /> 1onI- perimeter ' itch more or less parallel to Dutch Creek <br /> and to tho rock-disposal ar,.i . The perimeter ditch is <br /> designed to carry and also .;..pass flows in excess of those <br /> calculated for a 10-year 2—hour storm event . <br /> For further details on the rock tunnel <br /> area drainage control plan , including maps and cross-sec- <br /> tions , see Section B-8 , Appendix II-B-5 . <br /> ( 5) Rock spoil disposal area <br /> Spoil material from the construction of <br /> the rec :; tunnel .till amount to approximately 320,-000 cubicf' <br /> yard; and wi '_l be placed in a designated 13 . 5 acre disposal <br /> area . The tunnttl spoil material will be trucked to the <br /> di posai area and spread and compacted to Colorado .Mined <br /> wand Rc,= 1a:-ration 3oar6 specifications . The perimeter slope <br /> of the disoo -sa1 area will be maintained at the ratio of <br /> =_'i : i`J or `i!)e cut5lopt• o= the fill area will be ter- <br /> raced and/or benched at intervals of approximately 30 feet . <br /> ?r r to di_pos _nc of an , rock in the <br /> designaiec area , the crcund will first lie cleared of ve,rT,eta- <br /> Lion witt } L '_1CJ : 'rS and the toP3oil Szlockpiled <br /> �n acc0r:'' :'nce w - t% ai.`, 1i2ab re;uIati:ins The sal- =gad <br /> - -39- <br />