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<br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br /> <br /> <br />CUrrent long term 0 & M efforts woul d not be reduced by thi s a lternat i ve. <br />Occasi onal repai rs to the upstream slope protecti on and mai ntenance of the <br />downstream grass cover would be required. Eventually, maintenance repairs <br />would be needed for the new outlet works conduit. Because the outlet <br />structure would be located above the lowest point downstream; seepage <br />di scharges from the toe drai n woul d need to be monitored usi ng a wei r system <br />similar to that which is now in place. <br /> <br />The third alternative design for Twin Lakes Dam is summarized in Table V.3. <br />The emphasis of this design is on: (1) raising the earth dam crest to provide <br />additional storage and freeboard; (2) constructing an RCC dike/overflow <br />spillway across the existing spillway channel; (3) collecting and controlling <br />seepage; (4) stabilizing the downstream slope; and (5) replacing the outlet <br />works structure. Alternative No.3 is similar to Alternative No.2 with the <br />exception of not providing seepage reduction measures and the manner in which <br />the outlet works is replaced, <br /> <br />-66- <br />