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Task 10-Outlet Works Design <br /> Drawings and Technical Specifications will be developed for the outlet works portion of the project. <br /> Drawing and specification format and progress submittals will be the same as described under Task 7. The <br /> design of the outlet works will include lining the lower portion of the tunnel with an 11-foot diameter steel <br /> pipeline, a buried pipeline between the downstream tunnel portal,and a new outlet valve house. The valve <br /> house will be a reinforced concrete structure that supports and encloses guard valves and hollow jet control <br /> valves. A small steel control building will be designed to sit atop the valve house for protection of the valve <br /> actuators and control equipment. A plunge pool will be designed downstream of the outlet valves to prevent <br /> erosion of the stream bed. Armoring of the right and left embankments to prevent valve discharge erosion <br /> will also be included in the design. <br /> Provisions will be made in the design to accommodate the addition of future hydropower generation to the <br /> facility. This is assumed to include a 72-in. diameter, or larger, tap in the outlet conduit upstream of the <br /> hollow jet valves. The excavation for the valve house will be designed such that the rock at the right <br /> abutment allows for the future powerhouse excavation to be accomplished in proximity to the valve house. <br /> A combination trash rack/bulkhead gate structure will be designed for the upstream tunnel portal. The <br /> objective of this structure is to provide upstream isolation of the outlet tunnel. This will allow the outlet <br /> tunnel and outlet works to be"unwatered" for inspection and maintenance without requiring reservoir draw <br /> down. <br /> The final design efforts associated with the outwork works will require additional time to complete given <br /> the complexity of the bypass tunnel,phasing of the project, and the research and collaboration with the <br /> outlet valve supplier. The additional hours anticipated to complete the final design of the outlet works is <br /> summary an the attached man hour spreadsheet. <br /> Deliverables: 30 percent, 90 percent, and 100 percent Drawings and Technical Specifications <br /> Task 11 -QA/QC <br /> Each product produced for the District will be independently reviewed by D&A senior project staff that are <br /> fully familiar with the type of work, but not involved in the day to day execution of the particular product. <br /> The reports and memoranda will be reviewed for adherence to industry standards and engineering practice, <br /> accuracy of calculations, and compliance with our agreement with the District. Design drawings and <br /> specifications will be reviewed at the 90 percent level of completion for the following: <br /> • Discipline Review(each of civil, structural, mechanical, electrical and 1&C) <br /> • Interdisciplinary Review(cross checking between disciplines) <br /> • Constructability Review <br /> • Specification Review <br /> • Cost Estimate Review <br /> • Final Red/Yellow Check <br /> The District and stakeholder comments will be addressed and responded to at each level of design <br /> completion. <br /> Deliverables: Fully checked Bid Ready Contract Documents, Memoranda and Reports <br /> - 7 - <br />