In lieu fee mitigation plan
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- IN LIEU FEE MITIGATION PLAN
- The King County Mitigation Reserves Program Prepared by: Paul Adler, Ecologist Laird O’Rollins, Senior Ecologist
- King County Department of Natural Resources and Parks January 2017
- Table of Contents Executive Summary 3 I.Introduction 7
- III.Mitigation Project Overview 10 IV.Site Selection 11
- V.Baseline Conditions 16
- VII.Determination of Mitigation Credit 28
- XIII.Adaptive Management Plan 56 XIV.Site Protection 59 XV.Long Term Management Plan 59 XVI.Financial Assurances 61
| IN LIEU FEE MITIGATION PLAN
Elliott Bridge Reach Off-channel Habitat and Floodplain Reconnection Project January 2017 
Department of Natural Resources and Parks Water and Land Resources Division Capital Projects Section 201 South Jackson Street, Suite 600 Seattle, Washington 98104-3855 This page intentionally left blank IN LIEU FEE MITIGATION PLAN Elliott Bridge Reach Off-channel Habitat and Floodplain Reconnection Project Prepared for: US Army Corps of Engineers as Chair of the Interagency Review Team for a project to be implemented by: The King County Mitigation Reserves Program Prepared by: Paul Adler, Ecologist Laird O’Rollins, Senior Ecologist Jon Hansen, Senior Ecologist Joshua Latterell, PhD, Senior Ecologist Michael Murphy, ILF Program Supervisor Megan Webb, ILF Program Manager King County Department of Natural Resources and Parks January 2017 This page intentionally left blank Executive SummaryThe Elliott Bridge Reach Off-Channel Habitat and Floodplain Reconnection Project (EBR Mitigation Project) is located on the main stem of the Cedar River in the King County In-Lieu Fee Program’s Cedar River/Lake Washington Service Area. The project will remove historic fill to restore active floodplain, construct a side channel to provide refuge for migrating fish during high flows, and construct a scour structure to create and sustain pool habitat suitable for an adult salmonid holding area. The EBR Mitigation Project will restore approximately 11.5 acres of an active floodplain, adding flood storage capacity and improving salmon habitat. The project will reduce downstream flood risks and improve wetland and aquatic habitat in a reach of the river which currently lacks habitat diversity, a known limiting factor for chinook salmon productivity, as identified in the Lake Washington/Cedar/Sammamish Watershed (WRIA 8) Chinook Salmon Conservation Plan (Lake Washington/Cedar/Sammamish Watershed (WRIA 8) Chinook Salmon Conservation Plan, July 2005). This in-lieu fee mitigation site was designed to offset unavoidable impacts in the Cedar River/Lake Washington Service Area. The EBR Mitigation Project will be monitored for successful achievement of performance standards until at least the year 2026. After successful achievement of the performance criteria, the EBR Mitigation Project will earn a total of 7.06 credits, using an area-based method, not the credit/debit method. These credits will be released over time as performance standards are met.
Executive Summary 3 I.Introduction 7 A.Overview 7 B.Impacts Being Mitigated 7 C.Credit Generation 7 D.Transfer of Obligations 7
A.Wetland (Riparian/Floodplain Type) Mitigation Objectives 8 B.Aquatic (In-Water Mitigation Type) Mitigation Objectives 9 C.Additional Objectives 9 III.Mitigation Project Overview 10 IV.Site Selection 11 A.Location 11 B.Site Selection 11 C.Nearby Mitigation Encumbrances 13 D.Regulatory Property Perimeter Buffer 14 E.Easements and Road ROW areas within Mitigation Site boundaries 16 V.Baseline Conditions 16 A.Site Description and Baseline Conditions 16 B.Baseline Conditions: Wetlands 17 C.Baseline Conditions: Aquatic 18 VI.Mitigation Work Plan 19 A.Right Bank Wetland, Buffer, and River Margin 19 B. Right Bank Wetland Surface Water Elevations, Groundwater Elevations and Wetland Hydrology 20 C.Right Bank In-Stream Scour Structure 21 D.Left Bank Off-Channel Habitat, Wetland and Buffer 22 E.Right Bank and Left Bank Plant Establishment 23 F.Signage 26
A.Impact Information 28 B.Elliott Bridge Reach Mitigation Credits 32
A.Responsible Parties 62 B.Reporting 63 C.Access 63 XIX.References 64 List of Figures Figure 1 Vicinity Map 66 Figure 2 Regulatory Buffers and Mitigation Credit Areas 67 Figure 3 Elliott Bridge Reach Area Public Land 68 Figure 4 Known Cedar River Mitigation & Restoration Projects 69 Figure 5 Right Bank Mitigation Area 2013 Aerial Photo 70 Figure 6 Left Bank Mitigation Area 2013 Aerial Photo 70 Figure 7 Delineated Wetlands in the Elliott Bridge Reach 72 Figure 8 Historic Channel Migration in the Elliott Bridge Reach 73 Figure 9 Left Bank Vegetation Sampling Transect 74 Figure 10 Right Bank Vegetation Sampling Transect 75 List of Tables Table 1 EBR Mitigation Project Elements 10 Table 2 Wetland Designations, Classifications, Sizes and Regulatory Buffers 17 Table 3 Right Bank Plant Specifications 24 Table 4 Left Bank Plant Specifications 27 Table 5 WSDOT SR 520 Wetland Habitat Impacts Being Mitigated at the EBR Mitigation Project 30 Table 6 WSDOT SR 520 Aquatic Habitat Impacts Being Mitigated at the EBR Mitigation Project 30 Table 7 Total Acreages Proposed in WSDOT MRP Purchase 31 Table 8 EBR Anticipated Credits, Mitigation Obligations and Anticipated Surplus 34 Table 9 Maintenance Tasks 50 Table 10 Credit Release Schedule 52 Table 11 List of inspections by time, timing, and factors of interest 54 Table 12 Inspection questions, conditions of concern, and notification requirements for the key factors of interest in annual safety and post-flood inspections. 54 Table 13 Examples of adaptive management strategy options in response to various scenarios. 58
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