Agenda Packet 7-17-19 Work Session

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Ordinance Exhibit DOrdinanceExhibitD DOWNTOWN RIVERFRONT LAND USE COMPONENTS CA 19-1,RA 19-1,Z 19-5,WG 19-3,ST 19-3,and SDR 19-2 April 19,2019 (c)On sites where the slope within the conservation setback area exceeds 15 percent,measures (e.g.,planting and contouring)shall be taken to slow the flow of runoff to the maximum extent practicable (not including stormwater collected and discharged from impervious surfaces). Several areas of the conservation setback area on this site exceed 15%and these areas are scheduled for enhancement as described below. 1.Removal of non-native species within existing rip rap or other bank armoring structures to remain,backfilling of these areas with new soil,and replanting with native species. 2.Approximately 500 linear feet of the riverbank between the existing electrical tower and the future 5th Avenue overlook will be laid back to a much less steep condition in a broader curve than currently exists.This entire area will be backfilled and the bank rebuilt with lifts of fabric encapsulated soil then densely replanted with riparian native species plants. 3.Between the Peter DeFazio Bridge and the EWEB North Headquarters building the area within the conservation setback west of the existing bike path will be regraded,new soil placed,a new path constructed,and then the bank will be planted with new beds of native plants. More details of these grading and planting strategies are detailed on the attached grading and planting design sheets (WR 103 and 104 (Exhibit B.3:Standards Review Plan Set)).In all cases,the filtration and flow slowing ability of these steep river bank slopes will either be moderately or greatly enhanced using the above listed bank enhancement strategies. Therefore,this standard is met. (d)Non-native plants shall be permanently removed to the maximum extent practicable and replaced with native plant species in accordance with subsection (3)below. The Riverfront Park project will be permitted in two phases through the construction seasons of 2019 and 2020.Phase One work,permitted through a Standards Review application (SDR-19-001) submitted separately and currently under review,includes most of the work to permanently remove non-native invasive species and enhance the quality of the riparian vegetation along the river bank. Non-native species removal in the area adjacent to the Peter DeFazio Bridge will occur in the 2020 construction season with grading and replanting work scheduled for in conjunction with improved ADA access to the bridge from the existing bicycle path.Dense planting will follow these removals along with significant soil replacement and watering to ensure long term success of the new plantings. Therefore,this standard is met. (e)Except as required by EC 9.4980(2)(c),EC 9.4980(3)(d)and EC 9.4980(3)(e),site work to enhance the conservation setback area shall be completed prior to or concurrent with other site development,unless appropriate native plant species are not available within that time frame. The plan to approach the re-development of the Riverfront Park site over two construction seasons has been set in place to allow for long-term success when working to regrade and restore the river bank along the Willamette River.Phase One work (Summer of 2019)will include removal of all existing paving and rip rap in areas shown for bank regrading;laying back of the river bank;removal City of Eugene FINAL SUBMITTAL 86July 17, 2019, Work Session – Item 2