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-16- <br />7. The existing concrete slab slope protection on reconstructed Dams 2 and 3 would be <br />removed to a level below the existing beach levels. The slabs would be pushed into <br />the reservoir and abandoned, and would serve as upstream toe protection. <br />8. It is assumed that a sand mining pit would be developed near the South Platte River for <br />providing filter material and material for soil cemerit production. <br />9. Foundation seepage from the existing dams would be reduced through construction of <br />a slurry trench into sound bedrock. New embankment construction would utilize an <br />open excavation cutoff trench extended into sound bedrock. <br />10. Secondary outlet works facilities would be installed on reconstructed Dam 1 to provide <br />water for wetlands support and for water deliveries to Little Jumbo Reservoir. <br />Secondary outlet works facilities would be also installed on the new Dam Nos. 1 R and <br />1 A -2 -313 for release of the newly developed storage volumes which can not be released <br />by the existing outlet works. <br />11. Mobilization costs 1were determined: assuming that the project would proceed in a <br />continuous fashion, and multiple major mobilizations would not be necessary. <br />8.0 ENLARGEMENT ALTERNATIVE'S <br />8.1 General <br />A number of storage alternatives were studied and were narrowed down to three storage <br />levels. The enlargement'of the design study are at Gage 24, 27.5 and 30.5. It is our opinion <br />that storage above Gage 30.5 was not feasible due to the constraints of the inlet level. Within <br />these alternatives are six options for rehabilitation and /or reconstruction of existing facilities. <br />The alternatives and options are summarized on Table 2. The location of the proposed <br />reconstruction features are shown on Fig. 1. <br />2 \repofW97- 1- 500.nk <br />