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CM0001756 <br />Page 2 <br />5. Dam appurtenances will be constructed including placement of a conveyance pipe (i.e., to <br />allow the option for controlled discharge from one side of the Dam to the other, if necessary); <br />construction of concrete headwalls and associated structures (e.g., butterfly valves, hand <br />wheels to operate the butterfly valves, walkways to access the headwalls, etc.) at each end of <br />the conveyance pipe; construction of a Dam crest spillway [i.e., to allow emergency <br />discharge from Robinson Lake into the Dam's backwater area (referred to as the Seepwater <br />Pond) or vice versa]; and placement of the Dam crest gravel surface (i.e., to support <br />equipment/vehicle access across the Dam crest). <br />Section 2.0 provides a summary of the regulatory criteria considered for the Dam design. <br />Section 3.0 provides a summary of existing site conditions when this design report was finalized. <br />Section 4.0 provides a technical discussion of design evaluations and construction considerations <br />performed to design the Dam. <br />This design report also contains six appendices. These appendices provide the evaluations and <br />calculations used to develop the Dam design, as well as technical specifications and construction <br />drawings to guide and control construction of the Dam. The appendices and a brief description <br />of their contents are as follows: <br />• A Regulatory Overview (Appendix A) was performed to determine the Dam's <br />classification and permitting requirements; <br />• Borrow Area Data (Appendix B) were collected and summarized to evaluate on-site <br />borrow area material's geotechnical properties and approximate quantities; <br />• Seepage Control Analyses (Appendix C) were performed to determine the <br />effectiveness of seepage control options to minimize seepage through the Dam, the <br />Dam's foundation and a fractured bedrock zone; <br />• Slope Stability Analyses (Appendix D) were performed to determine the stability of <br />the Dam under design loading; <br />• Dam Construction Materials (Appendix E) were designed to specify the Dam's fill <br />zones and appurtenances; and <br />?:\nm?????.\.ia..\6iamp2.aa 12/03196 <br />=-Environmental