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• <br />HYDRO-TRIAD. LTD <br />i <br />~~~~ EXISTING GROUND <br />Top of Em6onkment (~ <br />W.B Elev.=l4' <br />Ripmp slope <br />profection~ <br />25 Yr.- 24 Hr. Storm max. W. S. Ele-! = l2' <br />~~~ ~ lOYr.-24 Hr. Storm mox. W.S. E/ev=l0' <br />.' <br />Primary Spillway Crest ~ <br />i ~ K! S. Elev. = 8 <br />~. 4,edyl~= ~~ ~4 3vbd <br />Fl(,l/RF 9 <br />~~' ~ ~ Narma/ W. S. E/ ev. = 8' <br />i <br />Emergency Spillway I ~ Average onnual sediment ~' <br />Crest ~ W.S. Elev.=l0'n 2 ~•~ l2'deposition %.5 f1. /~ '/ <br />48 Dio CMP J ~ -\ <br />~. <br />u <br />Riprop slope <br />pro/action <br />- ~ '- --'----------- ~' ~ EXISTING GROUND <br />i~ <br />~= ~ . <br />3 S~ ~ ' <br />.' <br />30° Dia. CMP Reservoir Boflom <br />Corrugoted Anti -Seep Collars ~~' ~ / / ~~ <br />r. (r Z / ~ <br />-- ~ ~ ~ Approx. ighwall <br />SPILLWAY DETAIL ' ~ location <br />~ ~ <br />i <br />i <br />~ ~ <br />' ~ / Approx. Lower Coal Houl Road <br />~ Seam loco/ion <br />Emergency Spillway 5f1. bottom ~~~ <br />width with 210 / Side Sbpes ~' Access Rood _ _ _ _ _- _ -_ - _ <br />- - - - <br />30 ~ <br />Sediment Pond Total <br />~ 12 volume= 8.64 Ac. Fl. ~ I Dotum Elev =O.O, Exoc/ E/ek <br />to be determined in the field <br />L 80' I ~ <br />r "1 <br />Riprop~~ See Spillway Deloil <br />SECTION <br />Pit~4 <br />Sediment Ponds <br />AUGUST, /98/ <br />7500 <br />7450 <br />7400 <br />F <br />w <br />J <br />w <br />X <br />0 <br />a <br />a <br />a <br />DETA lLS <br />SEDIMENT POND ~ PlT #4 <br />~ THE ROCKCAS7LE COMf#~NY <br />GRASSY CREEK COAL MINE NO.I <br />111-23 <br />