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Finding: The River Road/Santa Clara area and urban transition areas are already identified <br /> in the City Code and land use regulations. As such, no changes were made to the design manual. <br /> Comment 12: Will all pollution reduction and flow control facilities designed using the <br /> SIM form always comply with the requirements, regardless of location and surrounding level <br /> of urbanization? <br /> Finding: Yes, the sizing factors were developed based on the most conservative design <br /> parameters, including the lowest infiltration rates, and impervious surface area at full build-out based <br /> upon Metro Plan land use designations. Inquiry and response only. <br /> Comment 13: Will the performance approach for downsizing facilities be allowed when <br /> headwater flow controls are not required? <br /> Finding: Yes. The performance approach is an alternative to the simplified approach to <br /> sizing facilities. The performance approach may be used for sizing pollution reduction and/or flow <br /> control facilities regardless of location, and requires calculations to verify that a facility design meets <br /> the requirements for a particular site. The simplified approach assumes (conservatively) that both <br /> pollution reduction and flow control requirements apply. In non-headwaters areas, where flow <br /> control requirements do not apply, the manual indicates that the performance approach may be used <br /> <br /> to downsize facilities, in acknowledgement that by using the simplified approach a facility maybe <br /> over-designed. <br /> Application of flow control requirements is limited to the headwaters area due to its unique <br /> physical characteristics that make it especially vulnerable to erosion and downcutting of streams and <br /> drainages with steep slopes, highly erodible soils, and high runoff velocities during rainfall events. <br /> Inquiry and response only. <br /> Comment 14: Can initial feasibility testing for infiltration be waived if existing testing <br /> data is on file, regardless of the date? <br /> Finding: Yes, provided the site is unchanged. Inquiry and response only. <br /> Comment 15: What provisions for access for operation and maintenance wilUshould be <br /> applied in the River Road/Santa Clara basin? <br /> Finding: Applicants are required to submit an operation and maintenance plan which <br /> describes and visually depicts access to the facility for operations and maintenance purposes. The <br /> Eugene Code,1971 requires that all stormwater facilities constructed pursuant to code requirements <br /> be operated and maintained by the owner. Applicants requesting city maintenance of their proposed <br /> facilities, must provided access for city equipment before the city will enter into an agreement with <br /> the applicant to take on maintenance responsibilities. Inquiry and response only. <br /> Administrative Order - 5 <br /> <br />