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I I I I I I I I I I I I I I I I I I I =================================================~======================================= AL TERUATlVE ----------------------------------------------------------------------------------------- ----------------------------------------------------------------------------------------- DESCRIPTION ESTII4ATED COST ItICLUDHlG 25% COIlTlNGEUCY 1 2 3 Replace dam, outlet works, and service spil1l1ay with RCC dam. Grout dam foundation rock. Set crest of dam at elevation 951B. Incorporate outlet works and service spillway for 100-year flood into RCC dam. Repair ex- isting auxiliary spillway by constructing RCC overflow crest and downstream apron, flattening upstream slope of dike and overflow section using rockfill, and installing filter blanket and toe drain beneath RCC apron. $ 1,050,000 - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - Replace outlet conduit with grouted steel liner. Replace Inlet and outlet structures and gate. Repair wet well. Raise darn crest one foot. In- stall filter blanket and toe drain system In downstream shell and construct downstream berm. Remove exi st I ng ri prap from upstream face, and flatten slope, and place soil cement on upstream face. Repair existing auxiliary spillway by con- structing impervious cut off, providing rockfill overflow crest and downstream slope, flatten upstream slope, and install filter blanket and toe drain on downstream slope. $ 515,800 - - - - - - - - - - - - - - - - - - - - - - Repair outlet works conduit and wet well. Re- place inlet and outlet structures and raise dam crest one foot. Install filter blanket and toe drain system in downstream shell, and construct do,mstrearn berm. Remove rI prap from upstream face and flatten slope. Replace bedding and rlprap. Repair and utilize existing auxiliary spillway by flattening downstream slope and providing rockfi11 overflow crest and downstream slope, flatten up- stream slope of dike and overflow section and Install filter blanket and toe drain beneath rockflll. $ 346,000 ========================================================================================= vffl