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~ ,~ iii iiiiiiiiiiiii iii <br />GREAT DIVIDE ENGINEERING - <br />i a'.ll`:Ip~ti in a y~.5'th'' <br />'O~1hcL~L t,l~ ; Q <br />AND SURVEYING '~"~ ~`~~ <br />P. 0. Box 605 404 N. 19th Street~~~:. ~~~~°y 1~1 ~j't1 Q ` <br />Phone 303 275-8881 ; , ;.~:~~;~ <br />Canon City, Colorado 81212 2.ao~ ~ <br />CEC l47NERALS, INC + "~ lda-. ~ `~*...g "'` <br />~~a <br />BOX 225 4 <br />FLORENCE, CO April 12, 1982 <br />RE: Variations from pond designs <br />The following Zist represents the variations found between <br />design and existing conditions while designing the sedimentation <br />ponds requested by your office. These variations are for the <br />sedimentation ponds A,D,C,D,Temp. <br />1J Pond A- Tl,e de~:iyn shows the emergency spillway to be 21' <br />wide with a water depth of 1'-;'. The exlstiny spillway at <br />only 5' wide, needs to be widened, with rip-rap, to the <br />above ~~idth. Additionally, the emergency spillway needs <br />to be lowered 0. 7' while the dam crest must be raised 2'. <br />2) Pond C- Pond C design drawing shows a 45' dam width on top <br />for the proposed roadway. The existing dam needs to be <br />widened approximately 23' to the north, with rio-rap as <br />detailed in design drawing and extension of the primary <br />spillway outlet pipe. <br />31 Pond D- Primary spillway outlet shos~s a 12" Ch;P. An 8" <br />CMC' is existing, which nerds to be replaced. The bottom <br />oC the dam is shown as much higher than existing, and needs <br />to be raised. <br />4) Pond Temp- The existing elevation of the primary spillway is <br />just slightly lower than the emergency spillway, as shown <br />on the drawing. The existing primary outlet should be <br />Lowered one foot. The emergency spilLoay was redesigned <br />For a o-;atc-r depth of 3;4 foot and existing spillway width. <br />truly yours, <br />