401 Taylor Boulevard Residential Project Initial Study – Mitigated Negative Declaration prepared by City of Pleasant Hill Public Works & Community Development Department 100 Gregory Lane Pleasant Hill, California 94523 Contact: Jeff Olsen, Associate Planner prepared with the assistance of Rincon Consultants, Inc. 449 15th Street, Suite 303 Oakland, California 94612 April 2020 401 Taylor Boulevard Residential Project Initial Study – Mitigated Negative Declaration prepared by City of Pleasant Hill Public Works & Community Development Department 100 Gregory Lane Pleasant Hill, California 94523 Contact: Jeff Olsen, Associate Planner prepared with the assistance of Rincon Consultants, Inc. 449 15th Street, Suite 303 Oakland, California 94612 April 2020 This report prepared on 50% recycled paper with 50% post-consumer content. Table of Contents Table of Contents Abbreviations and Acronyms.................................................................................................................. v Initial Study ............................................................................................................................................. 1 1. Project Title ......................................................................................................................... 1 2. Lead Agency Name and Address ......................................................................................... 1 3. Contact Person and Phone Number ................................................................................... 1 4. Project Sponsor’s Name and Address ................................................................................. 1 5. Project Location .................................................................................................................. 1 6. General Plan Designation .................................................................................................... 1 7. Zoning.................................................................................................................................. 4 8. Project Description .............................................................................................................. 4 9. Surrounding Land Uses and Setting ..................................................................................15 10. Other Public Agencies Whose Approval is Required ........................................................15 11. Have California Native American Tribes Traditionally and Culturally Affiliated with the Project Area Requested Consultation Pursuant to Public Resources Code Section 21080.3.1? If so, has consultation begun and is there a plan for consultation that includes, for example, the determination of significance of impacts to tribal cultural resources, procedures regarding confidentiality, etc.? ...........18 Environmental Factors Potentially Affected .........................................................................................19 Determination ......................................................................................................................................19 Environmental Checklist .......................................................................................................................21 1 Aesthetics ..........................................................................................................................21 2 Agriculture and Forestry Resources ..................................................................................29 3 Air Quality .........................................................................................................................33 4 Biological Resources ..........................................................................................................41 5 Cultural Resources ............................................................................................................47 6 Energy ...............................................................................................................................51 7 Geology and Soils ..............................................................................................................55 8 Greenhouse Gas Emissions ...............................................................................................65 9 Hazards and Hazardous Materials ....................................................................................73 10 Hydrology and Water Quality ...........................................................................................79 11 Land Use and Planning ......................................................................................................87 12 Mineral Resources ............................................................................................................89 13 Noise .................................................................................................................................91 14 Population and Housing ..................................................................................................103 15 Public Services .................................................................................................................105 16 Recreation .......................................................................................................................109 Initial Study – Mitigated Negative Declaration i City of Pleasant Hill 401 Taylor Boulevard Residential Project 17 Transportation ................................................................................................................111 18 Tribal Cultural Resources ................................................................................................121 19 Utilities and Service Systems ..........................................................................................125 20 Wildfire............................................................................................................................133 21 Mandatory Findings of Significance ................................................................................137 References ..........................................................................................................................................141 Bibliography ................................................................................................................................141 List of Preparers ..........................................................................................................................146 Tables Table 1 Tree Condition and Frequency of Occurrence ..................................................................16 Table 2 Building Materials by Dwelling Type .................................................................................26 Table 3 Criteria Air Pollutant Significance Thresholds ...................................................................35 Table 4 Estimated Daily Construction Emissions ...........................................................................37 Table 5 Project Compliance with General Plan Goals and Policies ...............................................45 Table 6 Estimated Fuel Consumption ............................................................................................53 Table 7 Project Compliance with Energy Efficiency Goals and Policies .........................................54 Table 8 Active Fault Zones Near the Project Site...........................................................................56 Table 9 Compaction Recommendations ........................................................................................62 Table 10 PG&E Energy Intensity Factors..........................................................................................67 Table 11 Combined 2030 Annual Emissions of Greenhouse Gases.................................................69 Table 12 ABAG/MTC Plan Bay Area 2040 Consistency for GHG Emissions .....................................70 Table 13 2003 Pleasant Hill General Plan Policy Consistency for GHG Emissions ...........................70 Table 14 Project Consistency with General Plan Policies ................................................................88 Table 15 Long-term Noise Measurement Results ...........................................................................93 Table 16 Short-term Noise Measurement Results ..........................................................................94 Table 17 Significance of Changes in Operational Roadway Noise Exposure ...................................94 Table 18 City of Pleasant Hill Noise and Land use Compatibility Guidelines...................................95 Table 19 Maximum Noise Standards by Zoning District ..................................................................97 Table 20 Typical Construction Equipment Noise Levels ..................................................................98 Table 21 Traffic Noise Levels with and without Project ................................................................100 Table 22 Cumulative (2040) Traffic Noise Levels with and without Project ..................................101 Table 23 Vibration Source Levels for Construction Equipment .....................................................102 Table 24 Estimated Project Trip Generation .................................................................................117 Table 25 Contra Costa Water District Supply/Demand Balance Normal Year (acres feet) ...........126 ii Table