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n <br /> <br /> p,,,a SCOPE OF WORK <br /> EUGENE DELTA PONDS PERMITTING SUPPORT <br /> City of Eugene <br /> Prepared by: Tetra Tech, Inc. <br /> February 23, 2004 <br /> Task 1-Compile and Review Existing Studies and Information <br /> Reseazch will be done to obtain existing hydrologic and hydraulic studies for the project area. <br /> Contact will be made with FEMA to obtain the effective analyses that are reflected on the current <br /> FEMA maps. The data obtained will be reviewed to determine the approach for subsequent <br /> modeling. This initial investigations phase was authorized via a-mail January 20, 2004 (See <br /> Attachment A). <br /> Task 2 -Hydrologic Analysis <br /> This task includes cursory hydrology to verify existing FEMA dischazges and to determine <br /> which flow values to use in the effective and with-project hydraulic modeling efforts. Additional <br /> labor hours will be required to expand this task if FEMA hydrology becomes available. <br /> Task 3 -Hydraulic Analysis <br /> A duplicate effective analysis and proposed conditions model will be developed for the 100-year <br /> floodplain and floodway. These models will be based on the effective hydraulic model obtained <br /> from FEMA for the Willamette River. The previous studies that aze available in hard copy only <br /> will be entered electronically in order to create the model in HEC-RAS. These sections will then <br /> be modified to reflect the current proposed project. No FEMA models aze available for Dedrick <br /> Slough. For these reaches an effective and proposed conditions model will be created based on <br /> the models presented in the Eugene Delta Ponds Restoration Project hydraulic appendix (Tetra <br /> Tech, 2002, under contract with the Corps of Engineers, Portland District.) The Corps of <br /> Engineers and City of Eugene will be contacted to determine the configuration of the latest <br /> proposed design. The project design will be added to the applicable cross sections for the <br /> proposed conditions model runs. The model will be calibrated and optimized to match the FEMA <br /> flood profiles within 0.5 feet at the selected upstream and downstream tie-in points. <br /> Task 4 - Fooodplain Mapping <br /> A map will be generated using the results of Task 3 showing the proposed 100-yeaz floodplain <br /> and floodway boundary. The revised floodplain boundary will be tied in with the floodplain <br /> shown on the FEMA floodplain map. Background mapping will be based on City of Eugene 2- <br /> foot topographic mapping. <br /> Task 5 -Report Preparation <br /> A report will be prepared that documents the floodway/floodplain analysis and the changes to the <br /> existing FEMA floodplain. This report will include the FEMA application/certification forms <br /> that aze required in order to request for a map change from FEMA. This report will be submitted <br /> <br />