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Mr. Brian Genovese, P.E. <br /> City of Eugene <br /> May 12, 2000 <br /> Page 2 <br /> • Excavate approximately 8 test pits at selected locations. Provide a geologist inspector to <br /> develop field logs and collect representative soiUrock samples. Locate test pits from <br /> existing site features. <br /> • Prepare a brief report of findings, including logs of the test pits. <br /> CDM/AGI will coordinate the schedule for conducting the field investigation with the City's <br /> Project Manager. <br /> Task 4 -Hydraulic Analysis (Inter-Fluve). Develop a detailed HEC-RAS hydraulic model for <br /> the proposed stream alignment. Conduct hydraulic analyses to predict water surface elevations, <br /> flow regimes, water velocity and shear stress along the proposed stream alignment. Use a range of <br /> design flows determined during previous studies conducted by the City. <br /> Inter-Fluve will prepare a cover letter to accompany hydraulic model results and calculations from <br /> Task 4 Hydraulic Analysis and Task 5 Channel Stability and Scour Analysis (see below). <br /> Task 5 -Channel Stability and Scour Analyses (Inter-Fluve). Using results from the HEC- <br /> RAS model, conduct channel stability analyses using analytical techniques to establish stable <br /> channel dimensions and bed sediment sizes to accommodate the range of expected flows. As <br /> needed, analytical techniques may include: incipient motion particle size, riprap or rock size <br /> calculations, general scour, bend scour, and step-pool stability. <br /> Task 6 -Drawings (Inter-Fluve). Provide drawings to be inserted into the City's plan set. The <br /> drawings will be prepared using AutoCAD r14 and consistent with current city CAD standards. <br /> The drawing submittal will include electronic copies and reproducible B-size drawings of the <br /> following: <br /> • Plan & Profile Sheet showing channel alignment & design grade, locations & geometry of <br /> grade control elements. <br /> • Typical Cross-Sections & Details Sheet, which will indicate dimensions of typical riffles, <br /> .drop structures, and pools, as well as typical details associated with biotechnical bank <br /> stabilization construction. <br /> The design will emphasize the use of natural materials including native riparian vegetation, trees, <br /> rounded river rock, boulders, and large wood. The goal of the design concepts will be to meet City <br /> objectives for stabilizing banks, preventing erosion, and providing shade to reduce water <br /> temperature. <br /> Task 7 -Technical Assistance During Construction (Inter-Fluve). An Inter-Fluve in-stream <br /> specialist will be available to provide technical advice to the City's construction manager, <br /> particularly in regard to the placement of boulders, rounded river rock, and large wood, with the <br /> intent of providing stream stability while creating hydraulic variability, in-stream habitat, and <br /> riparian habitat. Inter-Fluve has assumed that up to 90 hours of staff time and 8 hours of senior <br /> stafftime will be provided to assist the City during construction. <br /> <br /> 11ww <br /> o Fl~e~uu,~ p aG:~6eEupene • 3qh Ave oarc~caaacnw 31ih Ave 0es1~ Caaacaw3an nve Desi~ Soope 315~?110t docn <br /> <br />