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 (b)Impervious surfaces that are part of a use approved in accordance with EC 9.4930(3)shall be no larger than the minimum necessary for the approved use.For sites with wetlands,impervious surfaces shall be located as far from the boundaries of locally significant wetlands as practicable.For riparian and upland wildlife habitat sites,impervious surfaces shall be located as far from the line of ordinary high water as practicable. As noted previously,the Riverfront Park spans approximately 1,300 linear feet along the Willamette River between the EWEB Steam Plant and the Peter DeFazio bicycle and pedestrian bridge.A significant section of the Ruth Bascom Trail,Eugene's riverfront bicycle path,runs along the top of the riverbank and is in need of relocation and replacement.The bank itself is steep and also in relatively poor condition with significant basalt rock rip-rap and concrete armoring,blackberries and other non- natives,along with some native species riparian vegetation. In addition to the Ruth Bascom Trail,proposed impervious surfaces include two new overlooks (North Overlook at 5th Avenue and South Overlook near the Steam Plant);pedestrian walks and seat walls;a shade pavilion (5th Avenue);and wood viewing decks and seating structures. As illustrated on Sheets WR 102.1 and WR 102.2,the majority of impervious surface are proposed for construction outside of /WR conservation areas.The only features that extend into /WR conservation areas are the 5th Avenue Overlook,the South Overlook near the Steam Plant,a portion of concrete seat wall between the overlooks,an architectural shade structure,and small portions of the Ruth Bascom Path.The proposed extensions within /WR conservation areas are minimal and responsive to the existing steep bank and non-native and invasive species vegetation along its extent. The proposed impervious surfaces associated with the Riverfront Park design are important components of the public improvements to the Riverfront Park envisioned in the EWEB Master Plan and subsequent design work that was heavily informed by public input and long term downtown planning for decades.The proposed improvements are designed to be fully accessible and provide critical visual access to the Willamette River and the riparian landscape beyond.The overlooks provide key arrival points at the River at the end of view corridors identified as critical design components of the Downtown Riverfront redevelopment site.Landscape areas surrounding these overlooks and associated developed park components are largely planted with native species and the additional riparian bank enhancement area created by reducing the slope of the riverbank between the two overlooks more than mitigates for the areas of impervious surfaces included as improvements in the area. Therefore,this standard is met. (c)Durable porous paving treatments or other infiltration devices approved by the planning director or decision-maker shall be used in lieu of standard impervious paving surfaces to increase infiltration of stormwater where practicable.This standard shall apply only to low volume parking areas,foot paths or lightly used access roads,where porous soils and flat topography will facilitate infiltration of runoff.For the purposes of this subsection,gravel surfaces are not acceptable as porous paving or as an infiltration device. City of Eugene FINAL SUBMITTAL 94July 17, 2019, Work Session – Item 2