Ordinance No. 20414 - Laserfiche WebLink

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within the Willamette River and along the greenway setback. Water Buality may also be affected where impervious surfaces are added along the bridge approaches. Where areas are paved, water cannot penetrate the soils so it rushes over the surface. This can increase erosion and the movement of fine sediments and increase pollutant loads in watercourses. While construction of the replacement bridges will result in some new impervious surfaces, overall the project will result in a net decrease in impervious surface because ODOT will remove the approach roadway for the detour bridge. The applicant also proposes that water quality impacts will be mitigated through the use of effective land-based stormwater treatment systems that include measures to preserve and restore mature vegetation and maximize infiltration. The use of construction techniques that include temporary and permanent Best Management Practices for erosion and sediment control and spill control and prevention also can achieve compliance with clean water standards. Oregon Highway Plan 5A.l directs ODOT to implement Best Management Practices. Based on these findings, water quality will be maintained and mitigated, consistent with this goal. In addition, through the local permitting process, Eugene and Springfield can impose appropriate conditions to ensure that Best Management Practices are employed and that water quality is maintained, subject tg applicable approval criteria and related standards. By doing so, Goal 6 is satisfied.2 Regarding noise, a proj ect noise technical report was prepared as part of the Environmental Assessment (as required by NEP A) to analyze potential noise impacts resulting from the project. Per the ODOT Noise Manual (June 1996) analysis procedures, noise mitigation measures were evaluated to reduce noise levels to nearby residences as a result of the project. Noise walls were determined to meet the ODOT effectiveness and cost-effectiveness criteria in two locations and are recommended as mitigation (see supplemental information, Figures 7-9). The final \valllocations will be determined after public input is completed as part of the NEP A process. Additionally, as stated on page 13 of the written statement, the applicant proposes the following general measures: . Continue public involvement through design and construction . limit work hours . limit noise Therefore, in the context of a plan amendment, the proposed amendments are consistent with Statewide Planning Goal 6. Additionally, specific construction and operational details will be appropriately addressed during local permitting processes, subject to applicable approval criteria and related standards. Goal 7 - Areas Subiect to Natural Disasters and Hazards: To protect life and property from natural disasters and hazards. Goal 7 requires that local government planning programs include provisions to protect people and 2 Currently, there is no stormwater treatment for the decommissioned and detour bridges. Providing water quality treatment for the new bridges, which would be required through the applicant's proposed Best Management Practices, would have a beneficial effect on water quality. The water quality report for the project noted that the amount of runoff from the bridges would be so minor relative to the volume of flow in the Willamette River that the effect would be negligible. v Exhibit A - Findings Page 16