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Deliverables: Detailed description of geologic boring logs,televiewer lots,and laboratory test results <br /> Task 4-Geotechnical Analysis <br /> Data obtained from the field and geotechnical investigations and from the laboratory testing will be analyzed <br /> in order to develop clay liner design. It is expected that the analysis will include stability for the proposed <br /> liner and seepage analysis for the existing dam embankment and proposed clay blanket liner,as well as <br /> analysis of material quantities and the strength parameters,and other properties for the soil and bedrock. <br /> This stability analysis will address the loading conditions mandated by the SEO for Class I high hazard <br /> jurisdictional dams. D&A will also perform additional analysis of reservoir rim stability. <br /> Deliverables: Geotechnical Analysis Calculations Appendix <br /> Task 5-Hydraulic Analysis <br /> A hydraulic analysis will be completed for the spillway rehabilitation and low level outlet works. The <br /> spillway hydraulic analysis will use the maximum spillway discharge based on the Inflow Design Flood <br /> (IDF)established by CDM in 2008 based on the State of Colorado's Extreme Precipitation Analysis Tool <br /> (EPAT). Using the anticipated final line and grade of the spillway channel,a hydraulic profile will be <br /> created from the spillway entrance to the spillway terminus. The analysis will be prepared using 1-D <br /> numerical and analytical techniques to determine depths for gradually varied flow, normal depths,super <br /> elevation at the spillway bend,velocities,and freeboard requirements. The condition of the spillway plunge <br /> pool will also be investigated to assess its ability to successfully operate without damage under spill <br /> conditions. <br /> The hydraulic analysis for the low level outlet works will involve analytical techniques to determine normal <br /> and surge pressures in the tunnel, lined tunnel,and pipeline portions of the outlet;velocities along the entire <br /> low level outlet works;cavitation analysis;guard valve and control valve operating conditions and flow <br /> ranges;control valve discharge plume; and plunge pool and embankment protection requirements. The <br /> outlet works capacity will be optimized based on the existing tunnel dimension restraints. <br /> Deliverables: Hydraulic Analysis Calculations Appendix <br /> Task 6-Basis of Design Report <br /> A Basis of Design Report as required by the SEO will be prepared that describes the planned improvements <br /> to the dam and appurtenant facilities and provides a record of the field work and analysis portions of the <br /> work. Following is a preliminary outline for the report: <br /> Section 1 -Executive Summary <br /> Section 2-Introduction <br /> Section 3 -Geotechnical Considerations <br /> Section 4-Hydraulic Considerations <br /> Section 5 -Rehabilitation Alternatives Considered <br /> Section 6-Description of Spillway Rehabilitation <br /> Section 7-Description of Low Level Outlet Works <br /> Section 8 -Description of Clay Blanket <br /> Section 9-Other Issues <br /> Section 10-Construction Cost Estimate <br /> Section 11 -Construction Schedule <br /> Appendices with logs,test results,and calculations <br /> - 5 - <br />