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the year the settleable solids concentration exceeded the effluent limitation or for the last year the <br />model indicated there was sufficient storage for the sediment yield from the design storm.. The <br />SEDCAD4 model results presented herewith reflect a (Y) value that allows for the maximum <br />sediment storage that is either just below the elevation which would result in a settleable solids <br />concentration in Pond 016 discharge greater than the water quality criterion or at the elevation <br />which retains sufficient capacity to store sediment yield from the design storm event. <br />Pond O1 bA <br />Total pond storage capacity (at principal spillway elevation) _ <br />Principal spillway invert elevation (ft msl) _ <br />Storm predicted peak. settleable concentration = <br />Predicted annual sediment loading = <br />Predicted sediment storage = <br />Predicted sediment storage elevation (ft msl) _ <br />Number of Storage years (1~ _ <br />Pond 016 <br />Total pond storage capacity (at principal spillway elevation) _ <br />Principal spillway invert elevation (ft msl) _ <br />Storm predicted peak settleable concentration = <br />Predicted annual sediment loading = <br />Predicted sediment storage = <br />Predicted sediment storage elevation (ft msl) _ <br />Number of Storage }ears (Y) _ <br />16.78 acre-feet (ac-ft) <br />7,524.7 feet (ft) <br />Not Applicable <br />229 ao-ft <br />16.03 ac-ft <br />7,524.2 ft <br />7 years <br />8.33 ac-ft <br />7,462.0 ft <br />0.02 mUl <br />0.36 ac-ft <br />7.83 ac-ft <br />7,461.4 ft <br />9 years <br /> <br /> <br />~~ \ P ~~ R G/S /j/i <br />~a/~ ~~ ~ ~ o •'a. Herr •. ~~' <br />• , <br />~~~~,.~; <br />Date David A. Hettinger, Ct~~P~Q. i'$~6 ~~~ ~: <br />-0~~18406~;~- <br />,o ~~' :~_~'\ <br />/~%s`S~OfVAL. ~~~~°\\ <br />viii i 0 q u l n i i i m i ~~~~~~ ~~~ <br />TR-56 Preface -Page 3 Revised 09/06 <br />