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~~ ~' <br />Channel 16 is would be relocated 50 feet upgradient of its former location due to the extremely <br />steep terrain cut along Highway 67 and the complications of an additional interruption in traffic <br />along Highway 67 during construction. This channel conveys flows from six subbasins (SC1F, <br />NCF, NS1F, NS2F, NS3F, and NCF2E. The relocation would also be more compatible with <br />the conveyor location. <br />Channels 1, 2, 3, and 4 aze proposed to be relocated 25 feet downgradient to remove <br />interferences with the new water tank platform. <br />The computer modeling was accomplished with SED CAD+ to derive runoff estimates and <br />structure sizing. The design storm remains the 100-year, 24-hour , or 3.5 inch, event. All area <br />calculations were re-done to reflect the revised channel locations. <br />CC&V requests that you review and concur with the computations and the location such that <br />final design of the channels and other structures may be completed and that information <br />submitted to you for approval. We currently anticipate that those designs will be completed by <br />July 1, 1994 and that we would be able to construct beginning about one week later. At this <br />rate, we would need your approval on or about July 5, 1994. <br />Thank you for your assistance and your long hours spent on our behalf. <br />n erely, <br />Joh E. ardaway <br />alter Environmental Affairs <br />Attachments: SED CAD computations and Drainage Basin Map <br />FILE: CC&VSTIP.N06 <br />2 <br />