In lieu fee mitigation plan

Additional Objectives

• 
  Implement a project that will be compatible with future reach wide habitat and flood hazard reduction projects.
  
• 
  Maintain current level of flood hazard protection to adjacent properties.
  
• 
  Facilitate the re-establishment of floodplain connections that allow the river to expand into/utilize its historic floodplain for flood storage, energy dissipation, side channel formation/channel migration and sediment storage and/or recruitment.
  
• 
  Improve riparian plant diversity by replanting native tree and shrub species and controlling invasive species.
  

• 
  address potential recreational safety impacts related to installation of habitat structures.
  

As agreed upon in the WSDOT ILF Use Plan, WSDOT and Regulators agreed to provide KC with flexibility to tailor the final site design to be consistent with the overall restoration objectives for this reach of the Cedar River. Although the majority of the conceptual design was carried out, some adjustments have been made to be more in line with long-term restoration goals within this reach consistent with the site selection goals cited in Section III.B and the Compensation Planning Framework in the Program Instrument (Appendix I, Section 3.0) (King County 2012).

3. Mitigation Project Overview

Descriptions in this document will refer to “right” and “left” banks of the Cedar River relative to an observer facing downstream, such that “right bank” (RB) refers to the north bank of the river and “left bank” (LB) refers to the south bank of the river.

The EBR Mitigation Project has right bank and left bank locations in the reach of the Lower Cedar River (WRIA 8) between River Mile 5.3 and 5.6, east of the City of Renton in unincorporated King County. The project vicinity map is shown in Figure 1.

Table 1 below summarizes the proposed mitigation actions at the EBR Mitigation Site.

Table 1 EBR Mitigation Project Elements

Mitigation Project Element	Left Bank	Right Bank	Total
Wetland establishment	0.49	2.16	2.65
Off-channel aquatic area	1.02	NA	1.02
In-stream scour structure	NA	One structure	One structure
River margin habitat	NA	0.28	0.28
Removal of rock revetment	NA	300 ln ft	300 ln ft
Wetland enhancement	0.62	NA	0.62
Riparian upland enhancement	2.18	1.15	3.33
Riparian enhancement	0.90	NA	0.90
Woody habitat features, e.g. snags, wood piles, downed logs	Multiple structures	Multiple structures	Multiple structures
Mitigation Project Area Totals1,2	5.21	3.59	8.80

¹ Regulatory buffer area not included in totals

² Target acreages shown in this table are different than performance target acreages to allow for site changes that may occur due to the site’s location in a dynamic floodplain setting.

Mitigation actions are shown in Figure 2: Regulatory Buffers and Mitigation Credit Areas and are detailed on the Elliott Bridge Reach Off-Channel Habitat and Floodplain Reconnection Contract No. C00957C15 Plan Set (April 2015) attached to this document (Attachment 1) and included by reference and Elliott Bridge Reach Scour Structure Plan Set (March 2016) attached to this document (Attachment 2) and included by reference.

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