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Ordinance No. 20415
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2008 No. 20401-20425
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Ordinance No. 20415
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Last modified
6/10/2010 3:50:41 PM
Creation date
8/11/2008 12:54:47 PM
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Council Ordinances
CMO_Document_Number
20415
Document_Title
Amending Willakenzie Area Plan Text in the Willamette Greenway Section; Adopting an Exception to Statewide Planning Goal 15 Willamette River Greenway; and Adopting a Severability Clause
Adopted_Date
7/28/2008
Approved Date
7/31/2008
CMO_Effective_Date
8/31/2008
Signer
Kitty Piercy
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<br />property from natural hazards such as floods, land slides, earthquakes and related hazards, tsunamis <br />and wildfires. It is not subject to hazards normally associated with wildfires, or tsunamis. <br /> <br />Consistent with this goal, the City of Eugene has adopted provisions regulating development in <br />floodplains and floodways, and building codes regulations that address slopes and seismic concerns. <br /> <br />To the extent that this is relevant to the proposed plan amendment, the existing detour bridge does <br />not meet current seismic standards. Consistent with this goal, the proposed bridge replacement <br />proj ect will provide bridges that meet current seismic, safety and design standards. <br /> <br />Additionally, regarding slopes, portions of the project area are identified on the map for Relative <br />Slope Instability Hazards. The portions of the project site in the Whilamut Natural Area and <br />Eastgate Woodlands, and the area southeast of 1-5 and the Willamette River are identified as <br />moderate hazard areas. However, both of these areas are proposed for only temporary staging <br />locations. The applicant has completed 10 borings on either side of the river as part of a <br />geotechnical investigation related to the temporary detour bridge (three north of the river, seven <br />south of the river). A geological report (which was not submitted for this application) indicates that <br />geological resources in the project area consist of fill material, alluvium, and bedrock. The <br />processes affecting these materials are man-made, such as excavation and grading, and natural. <br />Since there is an existing bridge, impacts to geological resources would consist of relatively minor <br />changes in topography, minor settlement of near-surface materials, possible increase in erosion, <br />minor changes to the river flow regime and related sediment and related sediment transport, and <br />potential changes in slope stability (from vegetation removal). These impacts would occur as a <br />result of excavation, placement of structure and fills, and clearing and grading. Impacts related to <br />construction would be temporary, localized changes to river flow regime; stability of partially <br />constructed slopes; erosion; and resultant sedimentation. The highest risk to landslide would be <br />slope failure into the Willamette River; however, considering the low height of the riverbank, such a <br />failure would be limited to a small area relative to the width of the river. The applicant states that <br />geotechnical investigations will also be completed during design to determine the best method to <br />seat foundations and piers and to reduce effects related to hazards. Additionally, slopes will be <br />constructed in a manner that reduces potential for erosion or small landslides. <br /> <br />Therefore, the project would have no permanent effects on geological resources. In the context of a <br />plan amendment, landslide and earthquake hazards are addressed consistent with this goal. <br />Furthermore, specific construction details will be further reviewed during the local permitting <br />processes, subject to applicable standards, such as, based on the earthquake hazard, geotechnical <br />investigations should be completed prior to construction to determine the best method to seat <br />foundations, piers, and bents to reduce effects related to earthquakes (e.g., lateral spread, <br />liquefaction). In addition, slopes should be constructed in a manner that reduces the potential for <br />erosion or small landslides. <br /> <br />Regarding flooding, portions of the project area are located within the floodway and floodplain of <br />the Willamette River. As previously stated, both Eugene and Springfield have adopted ordinances <br />regulating construction within floodways and floodplains. Furthermore, in response to Metro Plan <br />policies C.30 and C.31 below, which is incorporated herein by reference, because the 1-5 <br />Willamette Bridge project is located within a FEMA designated regulatory floodway and <br /> <br />Exhibit A - Findings <br />Page 17 <br />
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