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I I I I I I I I I . I . . . . . .. I I ========================================================================================= ALTERNATIVE 1 ========================================================================================= DESCRIPTION ESTIMATED COST INCLUDING 25% CONTINGENCY Replace dam and outlet works with RCC dam at elevation 9305. Grout dam foundation. Con- struct earth dike in existing spillway site to elevation 9308. Increase normal reservoir pool from elevation 9295 to 9303 in order to increase storage capacity to 460 acre-feet. $ 450,000 2 - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - Excavate portion of dam and replace outlet works. Raise dam crest eight feet to increase storage capacity to 460 acre-feet. Construct RCC overflow dike spillway across existing spillway channel, with a crest elevation of 9303. Place filter blanket and toe drain on downstream slope. Grout dam foundation, remove riprap from upstream face and replace with soil cement. $ 394,000 3 - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - Replace outlet works by pipe jacking new conduit through embankment and plugging existing conduit. Construct new inlet and outlet structures. Raise dam crest eight feet to 9308, to increase storage capacity to 460 acre-feet. Construct RCC overflow dike spillway across existing spillway channel, with a crest elevation of 9303. Place filter blanket and toe drain and flatten downstream slope. Remove riprap from upstream face, flatten upstream slope with impervious material, bed, and replace riprap. $ 358,800 ========================================================================================= vii