P Hamilton Wetland A 0 3_ Restoration Plan 0 3 8 volumeII: EIR/EIS 9 LeadAgencies: California State CoastalConservancy and U.S. ArmyCorps of Engineers San FranciscoDistrict December1998 L P A 0 1 0 3 HAMILTON WETLAND RESTORATION PLAN 9 1 VOLUME I1: FINAL EIR/EIS Lead Agencies: California State Coastal Conservancy 1130 Broadway,1 lth Floor Oakland, CA94612-2530 Contact: Terri Nevins 510/286-4161 and U.S. ArmyCorps of Engineers San Francisco District EnvironmentalPlanning Section 333 Market Street San Francisco, CA 94105-2197 Contact:Eric F. Jolliffe 415/977-8543 PREPARED BY" Jones & Stokes Associates, Inc. 2600 V Street, Suite 100 Sacramento, CA 95818-1914 Contact: Lisa Larrabee 916/737-3000 DECEMBER 1998 This documentshould be cited as: Jones & Stokes Associates, Inc. 1998. Hamiltonwetland restoration plan, volumeII: final EIR/EIS. December. (JSA 98-033.) Sacramento, CA. Lead agencies: California State Coastal Conservancy, Oakland, CA, and U.S. ArmyCorps of Engineers, EnvironmentalPlanning Section, San Francisco, CA. Tableof Contents 0 3 9 3 Summary S-1 Chapter 1. Introduction 1-1 Overviewof the Proposed Project 1-1 The Proposal 1-1 Project Sponsors 1-2 Overview of CEQAand NEPA 1-2 Scope of the EIR/EIS 1-3 Definition and Purposes of Scoping 1-3 Elements of the ScopingProcess 1-3 Frameworkof the EIR/EIS 1-5 The Next Steps in the EnvironmentalReview Process 1-5 Chapter2. Purpose of and Need for the HamiltonWetland Restoration Plan 2-1 Introduction 2-1 Needfor Tidal Habitat Restoration in San Francisco Bay 2-1 Project Purposes 2-1 Project Goal and Objectives 2-2 Relationship to Other Projects and Plans 2-3 Defense Base Closure and Realignment Act of 1988 2-3 City of NovatoGeneral Plan 2-4 The San Francisco Bay Plan 2-4 San Francisco Estuary Baylands EcosystemGoals Project 2-4 San Francisco Estuary Project ComprehensiveConservation and ManagementPlan 2-5 Long-TermManagement Strategy for Disposal of Dredged Sediments in San Francisco Bay 2-5 EcosystemRestoration Program Plan 2-6 Oakland Harbor Navigation Improvement(50-Foot) Project 2-6 Chapter3. Project Alternatives under Consideration 3-1 Introduction 3-1 Project Background 3-2 HamiltonArmy Airfield Parcel 3-2 State LandsCommission Parcel 3-3 HamiltonWetlands Conceptual Restoration Plan 3-3 Conditionsfor Transfer 3-4 Access 3-4 Flood Control and Drainage 3-4 Structures 3-6 Process by Whichthe Site Is Being Remediated 3-6 Level to Whichthe Site Will Be Cleaned 3-9 HAAFDisposal and Reuse EIS Encumbrances 3-10 Alternative l: No Action 3-10 Alternative 2: Restoration of Wetlandsin the HAAFParcel through Natural Sedimentation 3-11 Restoration Targets 3-11 Construction and Restoration Timing 3-12 Site Preparation 3-13 Public Access 3-15 Alternative 3: Restoration of Wetlandsin the HAAFParcel Using Dredged Material 3-16 Restoration Targets 3-16 Construction and Restoration Timing 3-17 Site Preparation and Placementof DredgedMaterial 3-17 PublicAccess 3 -22 Alternative4: Restoration of Wetlands in theHAAF and SLC Parcels throughNatural Sedimentation 3-22 RestorationTargets 3 -23 ConstructionandRestoration Timing 3 -23 Site Preparation 3 -24 Public Access 3 -27 Alternative 5: Restoration of Wetlands in the HAAFand SLCParcels Using Dredged Material 3-27 Restoration Targets 3 -28 Construction and Restoration Timing 3 -29 Site Preparation and Placementof DredgedMaterial 3-30 PublicAccess 3-35 BelMatin Keys V RestorationScenario: Restoration of Wetlands in the HAAF,SLC, and BMKVParcels Using Dredged Material 3-36 RestorationTargets 3-36 ConstructionandRestoration Timing 3,37 Site Preparation 3-37 Chapter 4. Geology and Soils 4-1 Affected Environment 4-1 Data Sources 4-1 Regional Geology and Topography 4-1 Soils 4-3 Seismicityand Geologic Hazards 4’3 EnvironmentalConsequences and Mitigation Measures 4-5 Approach and Methods 4-5 Impact Mechanisms 4-5 Thresholds of Significance 4.-6 Impacts and Mitigation Measuresof Alternative 1: No Action 4-7 Impacts and Mitigation Measures Commonto Alternatives 2, 3, 4, and 5 4-7 Impacts and Mitigation MeasuresUnique to Alternative 2 4-10 lmpacts and Mitigation MeasuresUnique to Alternative 3 4-11 ii Impacts and Mitigation MeasuresUnique to Alternative 4 4-13 Impacts and Mitigation MeasuresUnique to Alternative 5 4-13 Potential Issues and Resolutions under the Bel Matin KeysV Scenario 4-14 Chapter 5. Surface Water Hydrology and Water Quality 5-1 Affected Environment 5-1 Data Sources 5-1 Climate 5- 1 Tides and Levees 5-2 Surface Water DrainagePatterns 5-3 Existing Water Quality Conditions 5-7 Wetland Water Quality 5-9 Water Quality Regulations 5-10 Environmental Consequencesand Mitigation Measures 5-11 Approach and Methods 5-11 Impact Mechanisms 5-12 Thresholds of Significance 5-14 Impacts and Mitigation Measuresof Alternative 1: NoAction 5-14 Impacts and Mitigation Measures Commonto Alternatives2, 3, 4, and 5 5-15 Impacts and Mitigation MeasuresUnique to Alternative 2 5-16 Impacts and Mitigation MeasuresUnique to Alternative 3 5-16 Impacts and Mitigation MeasuresUnique to Alternative 4 5-19 Impacts and Mitigation MeasuresUnique to Alternative 5 5-19 Potential Issues and Resolutions under the Bel Matin KeysV Scenario 5-20 Chapter6. Tidal Hydraulics 6-1 Affected Environment 6-1 Data Sources 6-1 Existing Tidal Hydraulic Regime 6-2 Environmental Consequencesand Mitigation Measures 6-3 Approach and Methods 6-4 Impact Mechanisms 6-4 Thresholds of Significance 6-5 Impacts and Mitigation Measuresof Alternative 1: No Action 6-5 Impacts and Mitigation Measures Commonto Alternatives2, 3, 4, and 5 6-5 Potential Issues and Resolutions under the Bel MarinKeys V Scenario 6-10 Chapter7. Pubfie Health 7-1 Affected Environment 7-1 MosquitoBreeding Conditions 7-1 Marin-SonomaMosquito AbatementDistrict 7-3 Criteria for Determiningthe Needfor Control at a MosquitoSource 7-3 Mosquito Control Methods 7-4 MosquitoHabitat Conditions and AbatementRequirements in the Project Areas 7-4 ooo 111 Environmental Consequences and Mitigation Measures 7-5 Approach and Methods 7-5 Thresholds of Significance 7-6 Impactsand Mitigation Measures of Alternative I: No Action 7-6 Impactsand Mitigation Measures Common to Alternatives2,3, 4, and 5 7-6 PotentialIssues and Resolutions under the Bel Matin Keys V Scenario 7-9 Chapter8. Biological Resources 8-1 Introduction 8-1 Affected Environment 8-1 Data Sources 8-1 Biological Communities 8-1 Special-Status Species 8-6 Environmental Consequencesand Mitigation Measures 8-8 Approach and Methodology 8-8 Thresholds of Significance 8-10 Impacts and Mitigation Measuresof Alternative 1: No Action 8-10 Impacts and Mitigation Measures Commonto Alternatives 2, 3, 4, and 5 8-11 Impacts and Mitigation MeasuresUnique to Alternative 2 8-11 Impacts and Mitigation MeasuresUnique to Alternative 3 8 -23 Impacts and Mitigation MeasuresUnique to Alternative 4 8-28 Impacts and Mitigation MeasuresUnique to Alternative 5 8 -29 Potential Issues and Resolutions under the Bel Marin Keys V Scenario 8-30 Chapter9. LandUse and Public Utilities 9-1 Affected Environment 9-1 Data Sources 9-1 Regulatory Setting 9-1 LandUses, Utilities, and Easementsat the Project Site 9-4 LandUses adjacent to the Project Site 9-6 Environmental Consequencesand Mitigation Measures 9-7 Approach and Methods 9-7 Thresholds of Significance 9-8 Impacts and Mitigation Measuresof Alternative 1: No Action 9-8 Impacts and Mitigation Measures Commonto Alternatives 2, 3, 4, and 5 9-8 Impacts and Mitigation MeasuresUnique to Alternative 2 9-9 Impacts and Mitigation MeasuresUnique to Alternative 3 9-10 Impacts and Mitigation MeasuresUnique to Alternative 4 9-10 Impacts and Mitigation MeasuresUnique to Alternative 5 9-11 Potential Issues and Resolutions under the Bel Matin Keys V Scenario 9-12 Chapter 10. HazardousSubstances, Waste, and Site Remediation 10-1 Affected Environment 10-1 Data Sources 10-1 iv Regulatory Overview 10-2 ChemicalSuitability of DredgedMaterial 10-4 Source Areas of HazardousSubstances and Waste 10-4 Sediment Quality 10-5 Environmental Consequencesand Mitigation Measures 10-6 Approach and Methods 10-6 Thresholds of Significance 10-7 Impacts and Mitigation Measuresof Alternative 1: NoAction 10-7 0 Impacts and Mitigation Measures Commonto 3 9 Alternatives2, 3, 4, and 5 10-7 7 Impacts and Mitigation MeasuresUnique to Alternative 2 10-8 Impacts and Mitigation MeasuresUnique to Alternative 3 10-8 Impacts and Mitigation MeasuresUnique to Alternative 4 10-9 Impacts and Mitigation MeasuresUnique to Alternative 5 10-9 Potential Issues and Resolutions under the Bel MarinKeys V Scenario 10-10 Chapter 11. Transportation 11-1 Affected Environment 11-1 Data Sources 11-1 Roadway Network 11-1 Existing Levels of Service 11-2 Vessel Transportation 11-2 Environmental Consequencesand Mitigation Measures 11-2 Approach and Methods 11-3 Thresholds of Significance 11-3 Impacts and Mitigation Measuresof Alternative 1: NoAction 11-4 Impacts and Mitigation Measures Commonto Alternatives2, 3, 4, and 5 11-4 Impacts and Mitigation MeasuresUnique to Alternative 3 11-5 Impacts and Mitigation MeasuresUnique to Alternative 4 11-5 Impacts and Mitigation MeasuresUnique to Alternative 5 11-5 Potential Issues and Resolutions under the Bel Matin KeysV Scenario 11-6 Chapter12. Air Quality 12-1 Affected Environment 12-1 Data Sources 12-1 Regional Climate 12-1 Federal and State AmbientAir Quality Standards 12-2 Existing Air Quality Conditions 12-2 Emission Sources 12-2 Attainment/NonattainmentStatus 12-3 Air Quality ManagementPrograms 12-3 General Conformity 12-4 Environmental Consequences and Mitigation Measures 12-5 Approach and