Laserfiche WebLink
Long Hollow Dam and Reservoir Phase I Summary Report <br /> used in the dam embankment upstream zone. Energy dissipation structures would be constructed <br /> at the end of the dam outlet works and at the discharge point of the spillway channel. <br /> Long Hollow dam and reservoir, with a capacity of 5,400 AF, as presented in Table 6,would cost <br /> $19.6 million (+1-50%). The $19.6 million cost for 5,400 AF equates to about $3,600 per AF. <br /> The total cost of the reservoir project will be influenced by the magnitude of the peak rate of flow <br /> in Long Hollow and the volume of the design flood. <br /> As stated in Section 8.2, financing for the design and construction of LHR is anticipated to be <br /> provided by the Authority from its La Plata River Future Projects Escrow Account. LPWCD <br /> would request funding from the Authority if the CWCB Phase II feasibility work is completed, <br /> after a more refined dam and reservoir size and design are determined, and after a refined opinion <br /> of cost has been prepared. Earth-rock fill configurations will be refined and spillway design- <br /> flood management will be optimized in the Phase II effort. LPWCD understands that the <br /> Authority requires the submission of a project proposal, as specified in the Future Projects <br /> Escrow Agreement, and that the Authority Board has discretion regarding approval of any <br /> proposal. <br /> 9.0 SUMMARY OF FEASIBILITY STUDY FINDINGS <br /> Key findings of this feasibility study include: <br /> 1. H-P's feasibility-level engineering geology study at the site reported that no geologic <br /> conditions that would make LHR technically infeasible were indicated. <br /> 2. A Section 404 Permit likely can be obtained with a reasonable amount of additional study <br /> and consultation. If the project has the potential to cause significant environmental <br /> impacts, an EIS may be needed. Threshold issues, such as minimization of impacts to the <br /> waters of the U.S., an acceptable Section 404 mitigation plan, mitigation for impacts to <br /> two prehistoric archaeological sites, and a non jeopardy finding for T&E species <br /> protected by the ESA are resolvable. Based on LPWCD discussions with CDOW and <br /> technical data evaluation by CDOW, the native fishery in the lower La Plata River can be <br /> 991-077.115 Wright Water Engineers, Inc. Page 21 <br /> July 2004 <br />