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<br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />II <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br /> <br />3) Increases the capacity of the emergency spillway to pass 1/2 of the PMF. <br />This will meet the proposed State Engineer design criteria. <br /> <br />4) Improves access to the dam crest spillway and control gates. <br /> <br />The recommended plan includes raising the dam embankment 5.5 feet and increasing <br />the downstream embankment slope to 2.25H:1V. The increase in embankment height <br />will increase flood storage and enable the emergency spillway crest to be raised <br />1.5 feet back to its original elevation. This will provide the City of Victor <br />with the additional water storage that it lost when the State Engineer required <br />the spillway to be lowered. <br /> <br />Flattening the downstream slope will provide additional stability and enable the <br />structure to meet current design factors of safety. The emergency spillway will <br />be widened to 42 feet wide and have sideslopes of 2H:1V. This will enable the <br />spillway to pass 1/2 of the PMF without overtopping the embankment. <br /> <br />Other improvements recommended under this plan include provisions for a foot- <br />bridge over the new emergency to provide access to the dam crest and control <br />gates, extension of the gate well and catwalk, extension of the outlet pipe, and <br />riprap protection of the spillway and embankment. <br /> <br />Costs <br /> <br />Estimated construction quantities and costs were determined based on the prelimi- <br />nary design sketches. A summary of the estimated quantities and their associated <br />costs are shown in Table 6.1. The total construction cost is estimated to be <br />$387,000. <br /> <br />Table 6.1 <br /> <br />EstilBted Construction <br /> <br />Quantities and Costs <br /> <br />EstilllClted Unit <br />Quantity Cost <br /> <br />Total <br />Cost <br /> <br />Item <br /> <br />Description <br /> <br />Unit <br /> <br />1 <br />2 <br /> <br />Mobil ization <br /> <br />LS <br /> <br />LS <br /> <br />$ 50,000 <br />$ 1 ,500 <br /> <br />$ 50,000 <br />$ 1,500 <br /> <br />Dewatering <br /> <br />LS <br /> <br />LS <br /> <br />3 <br />