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CT2015-074 Contract
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CT2015-074 Contract
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Last modified
11/6/2014 3:58:07 PM
Creation date
10/10/2014 12:59:53 PM
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Loan Projects
Contract/PO #
CT2015-074
Contractor Name
San Luis Irrigation District
Contract Type
Grant
Loan Projects - Doc Type
Contract Documents
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feasibility analysis and exchange of land between the Forest Service and the SLVID, 2) storage <br /> accounts and operation modeling, 3)execution of storage agreements, and 4)overall stakeholder <br /> coordination and program management. The successful management of these key issues is vital <br /> P �' g g Y <br /> to the overall success of the Project. This work is currently being conducted by SLVID under <br /> Contract C154219 at a cost of$239,360, under its sub-consultant—DiNatale Water <br /> Consultants. <br /> Primary Construction Components <br /> I.) Upstream Clay Blanket-In order to reduce seepage through the rock slide formation at the <br /> left dam abutment, a clay blanket slope liner will be installed on the upstream side of the dam at <br /> the left abutment. The clay blanket, shown on Figure 1 in plan and Figure 2 in cross- section, <br /> will be a zoned fill placed over the rock slide and extending across the west abutment of the dam <br /> approximately 100 feet. The zones include a filter layer, low permeability clay core, and cover <br /> zone. This improvement is expected to substantially reduce seepage and allow full storage <br /> capability of the reservoir to be achieved. Clay liner materials will be obtained by borrowing <br /> and processing approximately 20,000 cubic yards of soil and rock material from reservoir <br /> property. These areas are described in Figure 1. Processing shall consist of screening various <br /> gradations from the existing landslide deposit, as described in Exhibit 1. The clay liner material <br /> for the construction component described above was conducted under Contract C154213, <br /> under its sub-consultant—Brad Moore, at a final cost of$274,787.50. <br /> 2.) Low Level Outlet-The existing low level outlet will be replaced with a hollow jet valve <br /> discharge structure at the downstream side of the dam. The existing low level outlet tunnel will <br /> continue to be used to provide conveyance between the upstream and downstream portals. The <br /> existing sluice gate control structure will either be demolished or abandoned in-place with a <br /> bypass tunnel providing conveyance around the structure;this is shown on Figure 1. Schedule <br /> constraints for the work and the uncertainty of the demolition costs (for removal of existing <br /> sluice gate control structure) suggest that the construction bidding process may be the best way <br /> to determine the most economic solution. To that end,we recommend preparing the bidding <br /> documents with two options: Option 1 —Demolish Existing Sluice Gate Structure and Option 2— <br /> Construct Bypass Tunnel and Abandon Sluice Gate Structure. The District can then select which <br /> option is most economic based on the results of the bidding. Another important element of the <br /> low level outlet works is the provision for the future addition of hydropower. To allow <br /> hydropower to be added in the future with minimal disturbance to the primary function of the <br /> project, a tap will be provided at the low level outlet(downstream of the tunnel portal)which can <br /> be used to route flows to future turbine generator units. <br /> 3.) Spillway Improvements—In order to achieve the spillway capacity required by the State <br /> engineer's Office(SEO),the entrance training walls will require a substantial raise and the main <br /> channel training walls will require a roughly 2 to 6-foot raise. This is expected to be <br /> accomplished by a combination of cast-in-place concrete and perhaps shotcrete. Additionally, <br /> some of the existing spillway floor slabs will require replacement or rehabilitation due to the <br /> condition of the existing concrete. <br /> Federal Land Exchange <br /> Federal regulations preclude the sale of National Forest System lands except in rare situations. <br /> However,the Forest Service does have the authority to convey National Forest lands via <br /> 2 <br />
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