tolay lake regional park
Draft Environmental Impact Report
master plan
january 2017
State Clearinghouse Number2015062084
Prepared forSonoma County Regional Parks
2300 County Center Drive, Suite 120aSanta Rosa, CA 95403
Prepared byMIG, Inc.
800 Hearst AvenueBerkeley, CA 94710
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TOLAY LAKE REGIONAL PARK MASTER PLAN
DRAFT ENVIRONMENTAL IMPACT REPORT
State Clearinghouse #2015062084
PREPARED FOR:
Sonoma County Regional Parks 2300 County Center Drive, Suite 120a
Santa Rosa, CA 95403
PREPARED BY:
MIG, Inc. 800 Hearst Avenue Berkeley, CA 94710
January 2017
Sonoma County Regional Parks January 2017
Tolay Lake Regional Park Master Plan Table of Contents Draft Environmental Impact Report Page i
TABLE OF CONTENTS
Section 1 ONE Introduction ..................................................................................................................... 1-1
1.1 Purpose of the EIR ................................................................................... 1-1 1.2 Proposed Project ...................................................................................... 1-1 1.3 CEQA Process and Public Outreach ........................................................ 1-2
1.3.1 Notice of Preparation ................................................................... 1-2 1.3.2 Draft EIR Public Review ............................................................. 1-2 1.3.3 Comments and Responses Document and Final EIR .................. 1-3 1.3.4 Mitigation Monitoring and Reporting .......................................... 1-3
1.4 EIR Scope ................................................................................................ 1-3 1.5 Report Organization ................................................................................. 1-4
Section 2 Executive Summary ....................................................................................................... 2-1
2.1 Project Under Review .............................................................................. 2-1 2.2 Summary of Impacts and Mitigation Measures ....................................... 2-5
2.2.1 Potential Areas of Controversy .................................................... 2-5 2.2.2 Significant and Less-than-Significant Impacts ............................ 2-6 2.2.3 Significant and Unavoidable Impacts .......................................... 2-7 2.2.4 Alternatives to the Project ............................................................ 2-7
2.3 Summary Table ........................................................................................ 2-7
Section 3 Project Description ......................................................................................................... 3-1
3.1 Project Background .................................................................................. 3-1 3.1.1 Master Plan Process ..................................................................... 3-1
3.2 Project Location and Surroundings .......................................................... 3-2 3.2.1 Project Location ........................................................................... 3-2 3.2.2 Existing Land Uses ...................................................................... 3-2 3.2.3 Surrounding Land Uses................................................................ 3-3
3.3 Project Components ................................................................................. 3-3 3.3.1 Project Components Overview .................................................... 3-3 3.3.2 Park Complex............................................................................... 3-8 3.3.3 Camping ....................................................................................... 3-8 3.3.4 Informal Picnic Areas .................................................................. 3-9 3.3.5 Trails ............................................................................................ 3-9 3.3.6 Interpretive Plan ......................................................................... 3-13 3.3.7 Habitat Restoration and Enhancement ....................................... 3-15 3.3.8 Lake Restoration ........................................................................ 3-15 3.3.9 Cultural Resource Conservation ................................................ 3-15 3.3.10 Circulation and Access Improvements ...................................... 3-16 3.3.11 Environmental, Cultural, and Agricultural Study and
Education ................................................................................... 3-16
Sonoma County Regional Parks January 2017
Tolay Lake Regional Park Master Plan Table of Contents Draft Environmental Impact Report Page ii
3.3.12 Special Events ............................................................................ 3-16 3.3.13 Infrastructure .............................................................................. 3-17 3.3.14 Operations and Management ..................................................... 3-18 3.3.15 Fire Safety and Emergency Access ............................................ 3-22
3.4 Project Objectives .................................................................................. 3-22 3.5 Required Permits and Approvals ........................................................... 3-23
Section 4 FOUR Environmental Impact Analysis .................................................................................... 4-1
4.0 Environmental Impact Analysis................................................................ 4-2 4.1 Impacts Found To Be Less Than Significant ........................................ 4.1-1
4.1.1 Air Quality ................................................................................ 4.1-1 4.1.2 Geology and Soils ................................................................... 4.1-10 4.1.3 Greenhouse Gases ................................................................... 4.1-13 4.1.4 Hazards and Hazardous Materials .......................................... 4.1-16 4.1.5 Mineral Resources .................................................................. 4.1-19 4.1.6 Population and Housing .......................................................... 4.1-20
4.2 Aesthetics .............................................................................................. 4.2-1 4.2.1 Environmental Setting .............................................................. 4.2-1 4.2.2 Regulatory Setting .................................................................... 4.2-2 4.2.3 Impacts and Mitigation Measures ........................................... 4.2-11
4.3 Agriculture and Forestry Resources ...................................................... 4.3-1 4.3.1 Environmental Setting .............................................................. 4.3-1 4.3.2 Regulatory Setting .................................................................... 4.3-6 4.3.3 Impacts and Mitigation Measures ............................................. 4.3-8
4.4 Biological Resources ............................................................................ 4.4-1 4.4.1 Methodology ............................................................................. 4.4-1 4.4.2 Environmental Setting .............................................................. 4.4-3 4.4.3 Regulatory Setting .................................................................. 4.4-49 4.4.4 Impacts and Mitigation Measures ........................................... 4.4-59
4.5 Cultural Resources ................................................................................ 4.5-1 4.5.1 Environmental Setting .............................................................. 4.5-1 4.5.2 Regulatory Setting .................................................................. 4.5-10 4.5.3 Impacts and Mitigation Measures ........................................... 4.5-18
4.6 Hydrology and Water Quality ............................................................... 4.6-1 4.6.1 Environmental Setting .............................................................. 4.6-1 4.6.2 Regulatory Setting .................................................................. 4.6-11 4.6.3 Impacts and Mitigation Measures ........................................... 4.6-15
4.7 Land Use and Planning Policy .............................................................. 4.7-1 4.7.1 Environmental Setting .............................................................. 4.7-1 4.7.2 Regulatory Setting .................................................................... 4.7-2 4.7.3 Impacts and Mitigation Measures ............................................. 4.4-2
4.8 Noise ..................................................................................................... 4.8-1 4.8.1 Fundamentals of Environmental Noise ..................................... 4.8-1 4.8.2 Regulatory Setting .................................................................... 4.8-4 4.8.3 Environmental Setting .............................................................. 4.8-7
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4.8.4 Impacts and Mitigation Measures ........................................... 4.8-10 4.9 Public Services and Recreation ............................................................. 4.9-1
4.9.1 Environmental Setting .............................................................. 4.9-1 4.9.2 Regulatory Setting .................................................................... 4.9-2 4.9.3 Impacts and Mitigation Measures ............................................. 4.9-4
4.10 Transportation ..................................................................................... 4.10-1 4.10.1 Environmental Setting ............................................................ 4.10-1 4.10.2 Regulatory Setting .................................................................. 4.10-7 4.10.3 Impacts and Mitigation Measures ......................................... 4.10-18
4.11 Utilities ................................................................................................ 4.11-1 4.11.1 Environmental Setting ............................................................ 4.11-1 4.11.2 Regulatory Setting .................................................................. 4.11-8 4.11.3 Impacts and Mitigation Measures ......................................... 4.11-11
Section 5 Alternatives ..................................................................................................................... 5-1
5.1 Purpose ..................................................................................................... 5-1 5.2 Methodology ............................................................................................ 5-1
5.2.1 Selection of a Reasonable Range of Alternatives ........................ 5-1 5.3 Project Objectives .................................................................................... 5-2 5.4 Alternatives Considered ........................................................................... 5-2
5.4.1 Alternatives Rejected as Being Infeasible ................................... 5-3 5.5 Alternatives Analysis ............................................................................... 5-3
5.5.1 Alternative A: No Project/ Interim Master Plan .......................... 5-3 5.5.2 Environmentally Superior Alternative ......................................... 5-8
Section 6 CEQA-Required Conclusions ........................................................................................ 6-1
6.1 Summary of Significant Unavoidable Impacts ........................................ 6-1 6.2 Significant Irreversible Environmental Changes ..................................... 6-1 6.3 Growth-Inducing Impacts of the Proposed Project .................................. 6-2 6.4 Cumulative Impacts ................................................................................. 6-3
6.4.1.1 Aesthetics ..................................................................................... 6-3 6.4.1.2 Agricultural and Forestry Resources ........................................... 6-4 6.4.1.3 Air Quality and Greenhouse Gases .............................................. 6-4 6.4.1.4 Biological Resources ................................................................... 6-4 6.4.1.5 Cultural Resources ....................................................................... 6-4 6.4.1.6 Geology and Soils ........................................................................ 6-5 6.1.4.7 Hazards and Hazardous Materials ............................................... 6-5 6.1.4.8 Hydrology and Water Quality ...................................................... 6-5 6.4.4.9 Land Use and Planning Policy ..................................................... 6-6 6.4.4.10 Mineral Resources ..................................................................... 6-7 6.4.4.11 Noise .......................................................................................... 6-7 6.4.1.12 Population and Housing ............................................................. 6-7 6.4.1.13 Public Services and Recreation .................................................. 6-8 6.4.4.14 Transportation ............................................................................ 6-8
Sonoma County Regional Parks January 2017
Tolay Lake Regional Park Master Plan Table of Contents Draft Environmental Impact Report Page iv
6.4.1. 15 Utilities ...................................................................................... 6-9
Section 7 S Report Preparation ......................................................................................................... 7-1
Section 8 References ...................................................................................................................... 8-1
Appendices Appendix A Notice of Preparation (NOP) and NOP Scoping Comments Appendix B Air Quality and Greenhouse Gas Emissions Calculations Appendix C Phase I Environmental Site Assessment Appendix D Biological Resources Reports Appendix E Cultural Resources Reports Appendix F Hydrology and Water Quality Reports Appendix G Traffic Modeling Sheets
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Tables Table 2-1: Summary of Key Project Components Table 2-2: Summary of Significant Environmental Impacts and Mitigation Measures Table 3-1: Summary of Key Project Components Table 3-2: Trails on Existing Alignments Table 3-3: Proposed Trails and Phasing Table 3-4: Proposed Trail Bridges Table 3-5: Tolay Lake Regional Park Interpretive Zones Table 3-6: Tolay Lake Regional Park Special Events Table 3-7: Tolay Lake Regional Park Master Plan Phasing Table 3-8: Potential Permits and Approvals Table 4.1-1: Plan Consistency with BAAQMD 2010 Clean Air Plan Table 4.1-2: Modeled Construction Scenarios Table 4.1-3: Modeled Construction Emissions Table 4.1-4: Modeled Vehicle Trip Emissions Table 4.1-5: Total Combined Criteria Air Pollutant Emissions Estimates Table 4.1-6: Total Combined GHG Emissions Estimates Table 4.1-7: Mineral Resource Types in Project Site Table 4.3-1: Important Farmlands on the Project Site Table 4.3-2: Soil Types on Project Site Table 4.4-1: Soil Mapping Units in the Project Area Table 4.4-2: Summary of Project Area Biological Communities Table 4.4-3: Mitigation Requirements for Cutting Down or Removing Valley Oaks Table 4.4-4: Proposed Master Plan Policies to Avoid or Reduce Impacts on Biological Resources Table 4.6-1: 2016 Groundwater Well Data Table 4.6-2: Analysis of 2016 Groundwater Well Table 4.6-3: Existing Beneficial Uses of Tolay Creek and San Pablo Bay Table 4.6-4: New Impervious Area per Plan Table 4.6-5: Proposed Master Plan Policies to Avoid or Reduce Impacts on Hydrology and Water Quality Table 4.7-1: Applicable Sonoma County General Plan 2020 Goals, Policies, and Objectives Table 4.8-1: Definitions of Acoustical Terms Table 4.8-2: Typical Noise Levels in the Environment Table 4.8-3: Reaction of People and Damage to Buildings at Various Continuous Vibration Amplitudes Table 4.8-4: General Plan Non-Transportation Related Noise Standards Table 4.8-5: Adjusted General Plan Non-Transportation Noise Standards Table 4.8-1: Construction Equipment Noise Levels Table 4.8-2: Potential Master Plan Increases in Traffic Noise Table 4.9-1: Parks and Recreation Facilities within 5 miles of the Park Table 4.10-1: Study Intersections Table 4.10-2: Level of Service and Average Vehicular Delay Definitions for Signalized Intersections Table 4.10-3: Existing Intersections Operating Conditions Table 4.10-4: Future (2022) Intersections Operating Conditions Table 4.10-5: Future (2040) Intersections Operating Conditions
Sonoma County Regional Parks January 2017
Tolay Lake Regional Park Master Plan Table of Contents Draft Environmental Impact Report Page vi
Table 4.10-6: Trip Generation Table 4.10-7: Trip Distribution Table 4.10-8: Future 2022 and Future 2022 plus Phase A Intersections Operating Conditions Table 4.10-9: Future 2040 and Future 2040 plus Phase B Intersections Operating Conditions Table 4.10-10: Proposed Bicycle Facility Summary Table 4.11-1: Estimated Water Demand from Park Visitation Table 4.11-2: Projected Wastewater Flow Table 4.11-3: Projected Solid Waste Generation Figures Figure 3-1: Regional Location Figure 3-2: Project Location Figure 3-3: Project Site Figure 3-4: Existing Park Complex Figure 3-5: Conceptual Site Plan Figure 3-6: Park Complex Conceptual Site Plan Figure 3-7: Proposed Conceptual Interpretive Site Plan Figure 3-8: Proposed Restoration Areas and Existing Biological Communities Figure 3-9: Proposed Tolay Lake Restoration Figure 3-10: Proposed Cannon Lane Roadway Improvements Figure 3-11: Proposed Well Location Figure 3-12: Proposed Wastewater Facilities Figure 3-13: Proposed Park Emergency Access Figure 3-14: Proposed Park Complex Emergency Access Figure 4.2-1: View from Lakeville Highway at Cannon Lane and View at Cannon Lane Park Entrance Figure 4.2-2: Cannon Lane Entrance looking South, East-Facing View of the Tolay Lake Causeway Figure 4.2-3: Tolay Lake Winter and Summer Conditions Figure 4.2-4: Park Complex Ranch Buildings, Miwok Village Figure 4.2-5: Views Along the West Ridge: Petaluma River Valley and San Pablo Bay Figure 4.2-6: Fish Pond, Typical view along eastern ridge Figure 4.2-7: South Entrance Staging Area, Tolay Creek Figure 4.3-1: Prime Farmland Figure 4.3-2: Soils Figure 4.6-1: Tolay Creek Watershed and Drainage Network Figure 4.6-2: Tolay Creek Longitudinal Profile Figure 4.6-3: Tolay Lake Subwatershed, Drainages, and Approximate 100-year Floodplain Figure 4.7-1: Land Use Figure 4.10-1: Study Area Figure 4.10-2: Phase A Project Traffic Figure 4.10-3: Phase B Project Traffic
