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<br />I. <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br /> <br />. <br /> <br />. <br /> <br />~8- <br /> <br />suitable for review and approval by the SEO and for construc- <br />tion. <br /> <br />Task 4 - Construction specifications should include sec- <br />tions describing the general requirements for construction <br />including site access, disturbance, and other limitations: and <br />requirements for earthwork, concrete work, and reclamation. <br />The specifications should be suitable for review and approval <br />by the SEO and for construction. <br /> <br />Task 5 - Special use permits will be required by the <br />Forest Service in order to undertake any construction activi- <br />ties on National Forest Service property. This task should <br />include preparation of permit applications and work with the <br />Forest Service to obtain approval of the planned modifica- <br />tions. This work should be completed coincident with the <br />other Phase II work in order that construction documents con- <br />tain guidelines and requirements of the Forest Service. <br /> <br />Phase III <br /> <br />Work to be completed under Phase III will depend to a <br />significant degree on the extent of required spillway modifi- <br />cations and the amount of assistance desired by the Town of <br />Oak Creek in preparing and evaluating alternative bids. As a <br />minimum, we recommend that construction phase testing and con- <br />sultation services be retained and that we prepare as-built <br />drawings and a final construction report for submission to the <br />SEO for final approval. <br /> <br />SPECIAL CONSIDERATIONS <br /> <br />Basin Hydrology <br /> <br />Probable maximum flood studies for the Sheriff Reservoir <br />should consider the following factors: <br /> <br />o Initial "abstractions" (Water lost to storage in the <br />basin not available to become flood flow) are highly <br />variable from basin to basin and with time. The <br />Sheriff Reservoir drainage area appears to have a <br />potential for high storage within the basin, which, <br />when considered, could result in a decrease in PMF <br />flows. <br /> <br />o Infiltration losses may be high in the Sheriff <br />Reservoir basin throughout the PMP event due to the <br />characteristic soils and geology of the basin, another <br />factor which will lead to a decrease in the PMF flows. <br /> <br />o The phenomenon of interflow: the process by which <br />rainfall first infiltrates the soil, moves downhill <br />