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<br />B <br /> <br />Exhibit A <br />Grant for Proposed Feasibility Study of Long Hollow Reservoir and Red Mesa Reservoir Enlargement <br /> <br />. <br /> <br />. <br /> <br />r <br />, <br /> <br />R.. <br />l~ <br /> <br />potential for property damage or loss of life downstream in the event of a failure. The <br />outlet structure must be sized to draw the reservoir down quickly during an emergency. <br />Both the spillway and the outlet works must be sized for anticipated flows and provided <br />with suitable energy dissipation structures at the downgradient outlet. <br /> <br />The feasibility study will also include limited evaluation of the potential for the enlarged <br />reservoir to be used for hydroelectric generation. The evaluation will focus on fmancial <br />feasibility but will also consider feasibility of construction. <br /> <br />Evaluation of Alternatives <br /> <br />IS <br />I'" <br /> <br />F: <br />I <br />I <br /> <br />I' <br />[1 <br /> <br />A. Interpretation of Data <br /> <br />The existing data (and supplemental field and laboratory test results, if any,) <br />will be analyzed to establish strength, compressibility and permeability <br />characteristics of the soils and rock, which are in situ or proposed as <br />compacted, borrow materials at the dam and reservoir site. It may be that <br />additional geological and geotechnical studies may be included with pre- <br />design studies in the Grant/Loan request workplan submitted to the <br />Colorado Water Resources and Power Authority. <br /> <br />Geologic maps, logs of test borings, laboratory test results and periodic <br />groundwater readings in the piezometers will be used to develop design <br />parameters for use in the Conceptual level embankment design. <br /> <br />B. Conceptual Level Embankment Design <br /> <br />1. Embankment Section, Reservoir Geometry. <br /> <br />This task will consist of evaluating alternative embankment sections, <br />reservoir geometry and borrow area locations consistent with the existing <br />topography and engineering and geotechnical findings. <br /> <br />2. Borrow Area Alternatives. <br /> <br />We anticipate borrow material will be obtained primarily from the <br />reservoir and the left abutment near the spillway. <br /> <br />3. Seepage Reduction Alternatives. <br /> <br />The available information will be reviewed in order to develop feasible <br />methods for reducing water seepage through abutment and foundation <br />soils and rock. Potential seepage control measures include partial or <br />complete blanketing of the reservoir area; grouting the soils and rocks in <br />the foundation and abutments in order to increase seepage paths; <br />constructing a cutoff trench in the foundation and abutment materials; and <br />combining one or more of these measures to develop a seepage control <br />program. Two appropriate seepage control options will be selected based <br />on technical feasibility, constructability and cost. <br /> <br />E <br />~:;1 <br /> <br />~ <br />E.': <br />.". <br />if. <br /> <br />r: <br />k.. <br />l1L <br /> <br />I.:'..' <br />L <br />F' <br />~ <br />fl[, <br />~; <br /> <br />I <br />\.-". <br />b. <br /> <br />ro..". <br />i;"' <br />C <br /> <br />b <br />Pi.'! <br />U <br />fJ <br />L <br /> <br />('-','1 <br />r-2 <br />[: <br />