Social/Neighborhood Technical Report Multnomah County | Earthquake Ready Burnside Bridge Project Portland, OR January 29, 2021 Earthquake Ready Burnside Bridge Social/Neighborhood Technical Report Prepared for Multnomah County Transportation Division – Bridges 1403 SE Water Ave Portland, OR 97214 Prepared by HDR 1050 SW 6th Ave, Suite 1800 Portland, OR 97204 T (503) 423-3700 Parametrix 700 NE Multnomah St, Suite 1000 Portland, OR 97232 T (503) 233-2400 Contract# DCS-SVCSGEN-857-2019-conv HDR Project #10144814 The technical material and data contained in this document were prepared under the supervision and direction of the undersigned, as a professional environmental specialist and urban planner. ______________ Signature Reserved for Final Version Prepared by Justina Everhart (Environmental Planner) ______________ Signature Reserved for Final Version Checked by Jeff Heilman (NEPA Lead) ______________ Signature Reserved for Final Version Approved by Heather Catron (Consultant Project Manager) Social/Neighborhood Technical Report Multnomah County | Earthquake Ready Burnside Bridge Project Contents Executive Summary ...................................................................................................................................... 1 1 Introduction .......................................................................................................................................... 2 1.1 Project Location ......................................................................................................................... 2 1.2 Project Purpose ......................................................................................................................... 2 2 Project Alternatives ............................................................................................................................. 4 3 Definitions ............................................................................................................................................ 4 4 Legal Regulations and Standards ....................................................................................................... 7 4.1 Laws, Plans, Policies, and Regulations .................................................................................... 7 4.1.1 Federal ......................................................................................................................... 7 4.1.2 Local ............................................................................................................................. 8 4.2 Design Standards ...................................................................................................................... 8 5 Affected Environment .......................................................................................................................... 9 5.1 Area of Potential Impact ............................................................................................................ 9 5.2 Resource Identification and Evaluation Methods ...................................................................... 9 5.2.1 Published Sources and Databases .............................................................................. 9 5.2.2 Field Visits and Surveys ............................................................................................. 10 5.3 Existing Conditions .................................................................................................................. 10 5.3.1 Neighborhoods ........................................................................................................... 10 5.3.2 Demographics ............................................................................................................ 14 5.3.3 Housing and Households ........................................................................................... 16 5.3.4 Transportation ............................................................................................................ 17 5.3.5 Employment and Income ........................................................................................... 18 5.3.6 Community Facilities within the Project Area ............................................................. 19 5.3.7 Environmental Justice Summary ................................................................................ 25 6 Impact Assessment Methodology and Data Sources ....................................................................... 25 6.1 Long-Term Impact Assessment Methods ............................................................................... 25 6.2 Short-Term Impact Assessment Methods ............................................................................... 26 6.3 Indirect Impact Assessment Methods ..................................................................................... 27 6.4 Cumulative Impact Assessment Methods ............................................................................... 27 7 Environmental Consequences .......................................................................................................... 27 7.1 Introduction .............................................................................................................................. 27 7.2 Pre-Earthquake Impacts.......................................................................................................... 28 7.2.1 No-Build Alternative.................................................................................................... 28 7.2.2 Enhanced Seismic Retrofit Alternative ....................................................................... 29 7.2.3 Replacement Alternative with Short-Span Approach ................................................. 31 7.2.4 Replacement Alternative with Long-Span Approach ................................................. 32 7.2.5 Replacement Alternative with Couch Extension ........................................................ 33 7.3 Post-Earthquake Impacts ........................................................................................................ 35 7.3.1 No-Build Alternative.................................................................................................... 35 7.3.2 Enhanced Seismic Retrofit Alternative ....................................................................... 36 7.3.3 Replacement Alternative with Short-Span Approach ................................................. 38 7.3.4 Replacement Alternative with Long-Span Approach ................................................. 38 January 29, 2021| i Social/Neighborhood Technical Report Multnomah County | Earthquake Ready Burnside Bridge Project 7.3.5 Replacement Alternative with Couch Extension ........................................................ 38 7.4 Construction Impacts ............................................................................................................... 38 7.4.1 Without Temporary Bridge ......................................................................................... 39 7.4.2 With Temporary Bridge .............................................................................................. 45 7.4.3 Potential Off-Site Staging Areas ................................................................................ 47 7.5 Cumulative Effects .................................................................................................................. 48 7.5.1 No-Build Alternative.................................................................................................... 49 7.5.2 Build Alternatives ........................................................................................................ 49 7.6 Compliance with Laws, Regulations, and Standards .............................................................. 50 7.6.1 No-Build Alternative.................................................................................................... 50 7.6.2 Build Alternatives ........................................................................................................ 50 7.7 Conclusion ............................................................................................................................... 51 8 Mitigation Measures .......................................................................................................................... 52 8.1 Enhanced Seismic Retrofit Alternative .................................................................................... 54 8.2 Replacement Alternative with Short-Span Approach .............................................................. 54 8.3 Replacement Alternative with Long-Span Approach .............................................................. 54 8.4 Temporary Detour Bridge Option ............................................................................................ 54 9 Contacts and Coordination ................................................................................................................ 55 10 Preparers ........................................................................................................................................... 56 11 References ........................................................................................................................................ 57 Tables Table 1. API Population by Census Tract and Census Block Group .......................................................... 14 Table 2. Minority Population within the API and County ............................................................................