• Port of Seattle Land Stewardship Plan
    • List of Contributors
    • Table of Contents
    • Abbreviations
    • Executive Summary
    • 1 Introduction
      • 1.1 What is Land Stewardship?
      • 1.2 SEA Land Stewardship Planning Context
        • 1.2.1 Port Mission, Vision, and Values
        • 1.2.2 Port Century Agenda
        • 1.2.3 Port Equity Policy
        • 1.2.4 Port Commission Environmental Land Stewardship Principles
      • 1.3 Regional Tree Policy Initiatives
        • 1.3.1 Salmon Safe
        • 1.3.2 King County Strategic Climate Action Plan
        • 1.3.3 Green Cities Partnerships
        • 1.3.4 Federal, State, and Local Tree Equity Initiatives
      • 1.4 Creating the Land Stewardship Plan
        • 1.4.1 LSP Goals and Actions
        • 1.4.2 Internal Outreach and Coordination
    • 2 Methodology
      • Step 1. Define Geographic Extent
      • Step 2. Define Baseline Conditions
        • Step 2a. Assess Current SEA Land Use and Operations
          • Airport Operations Area
          • Runway Safety Area
          • Runway Protection Zone
          • Private Ground Leases
          • City of SeaTac Ground Leases
          • Future Development and Planning
          • Mitigation Restrictive Covenant
          • Flight Corridor Safety Program Mitigation
        • Step 2b. Assess Ecological Conditions
          • Habitat Corridors
        • Step 2c. Assess Equity and Community Access
          • Equity Index Data
          • Urban Heat Island Data
          • Community Access Data
      • Step 3. Evaluate and Assign LSP Recommendations
        • Step 3a. Define Management Units
        • Step 3b. Assess SEA Operational and Land Use Constraints
        • Step 3c. Assess Ecological Values and Threats
          • FLAT Assessment
          • Invasive Species Mapping
          • High-Value Tree Mapping
        • Step 3d. Assign LSP Recommendations
      • Step 4. Evaluate and Recommend Site-Based Stewardship Actions
        • Community Benefit Evaluation
        • Potential Site-Based Stewardship Actions
      • Step 5. Prioritize Sites for Stewardship
    • 3 LSP Baseline
      • 3.1 Geographic Extent
      • 3.2 Land Use
      • 3.3 Ecological Inventory
        • 3.3.1 Land Cover
        • 3.3.2 Critical Areas
        • 3.3.3 Habitat Corridors
      • 3.4 Equity and Community Access
        • 3.4.1 Equity Index
        • 3.4.2 Urban Heat Islands
        • 3.4.3 Community Access
    • 4 Stewardship Recommendations by Management Unit
      • 4.1 LSP Recommendations
      • 4.2 Ecological Assessment Results
        • 4.2.1 2023 High-Value Tree Survey
      • 4.3 Site-Based Stewardship Actions
        • 4.3.1 Aggregate Stewardship Potential
    • 5 Management Unit Prioritization
    • 6 Implementation
      • 6.1 LSP Implementation
      • 6.2 Conclusion
    • 7 References
    • Tables
      • Table 1
      • Table 2
      • Table 3
      • Table 4
      • Table 5
      • Table 6
      • Table 7
      • Table 8
      • Table 9
      • Table 10
    • Figures
      • Figure 1
      • Figure 2
      • Figure 3
      • Figure 4
      • Figure 5
      • Figure 6
      • Figure 7
      • Figure 8
      • Figure 9
      • Figure 10
      • Figure 11
      • Figure 12
      • Figure 13
      • Figure 14
      • Figure 15
      • Figure 16
      • Figure 17
    • Appendix A Mitigation Site Opportunity Assessment
      • Mitigation Site Opportunity Assessment
        • Table of Contents
        • Abbreviations
        • 1 Introduction
        • 2 Background and Overview
        • 3 Watershed Context
          • 3.1 Nearshore Subwatershed
            • 3.1.1 Miller and Walker Creeks
            • 3.1.2 Des Moines Creek
          • 3.2 Lower Green River Subwatershed
        • 4 Aviation Wetland and Buffer Mitigation Opportunities
          • 4.1 Aviation Property Sites
            • 4.1.1 MU 6: Borrow Site Study Area
            • 4.1.2 MU 24: Miller Creek East Study Area
            • 4.1.3
            • 4.1.4 MU 26: Wetland 2 Study Area
            • 4.1.5 MU 42: RST Property Study Area
            • 4.1.6
            • 4.1.7 MU 45: West Side Campus Study Area
            • 4.1.8 MU 46: Tyee Golf Course Study Area
          • 4.2 MU 48: Auburn Site Study Area
        • 5 Mitigation Bank Considerations
          • 5.1 Mitigation Bank Site Selection Considerations
          • 5.2 Preliminary Goals and Objectives
          • 5.3 Proposed Service Area
          • 5.4 Project Need Analysis
            • 5.4.1 Existing Mitigation Banks and In-Lieu Fee Programs
              • 5.4.1.1 King County In-Lieu Fee Mitigation Program
              • 5.4.1.2 Springbrook Creek Wetland and Habitat Mitigation Bank
              • 5.4.1.3 Thom Mitigation Bank
            • 5.4.2 Port of Seattle Mitigation Needs
              • 5.4.2.1 Maritime
              • 5.4.2.2 Aviation
            • 5.4.3 Other Potential Mitigation Credit Purchasers
          • 5.5 Process of Review and Approval
            • 5.5.1 Calculation of Mitigation Credits
            • 5.5.2 Calculation of Mitigation Debits
          • 5.6 General Market Assessment for a Potential Umbrella Bank
            • 5.6.1 Project Cost Factors
            • 5.6.2 Price of Mitigation Credits
            • 5.6.3 Auburn Site Study Area Opinion of Probable Costs
            • 5.6.4 Mitigation Bank Credit Price Considerations
              • 5.6.4.1 Mitigation Credits Generated from Auburn Site Study Area
              • 5.6.4.2 Price Comparison
              • 5.6.4.3 Other Considerations
        • 6 Summary
        • 7 References
        • Attachment A Opinion of Probable Costs
    • Appendix B FLAT Sample Field Form
    • Appendix C Land Stewardship Plan Mapfolio
    • Appendix D Long-Term Mitigation Stewardship Plan
      • Long-Term Mitigation Stewardship Plan
        • Table of Contents
        • 1. Introduction
        • 2. Approach
        • 3. Menu of Maintenance Actions
        • 4. Monitoring Schedule
        • 5. Future Considerations and Approach
        • 6. 2023 Mitigation Sites Monitoring Results and Maintenance Recommendations
        • References
        • Figures
        • Appendix A: Selected Photos
        • Appendix B: 2023 High-Value Tree Inventory Memorandum