Public Services Technical Report Multnomah County | Earthquake Ready Burnside Bridge Project Portland, OR January 29, 2021 Earthquake Ready Burnside Bridge Public Services 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 CERTIFICATION The technical material and data contained in this document were prepared under the supervision and direction of the undersigned, as an environmental professional. ______________ Signature Reserved for Final Version Prepared by Justina Everhart (Environmental Planner) ______________ Signature Reserved for Final Version Checked by Jen Hughes (Senior Environmental Planner) ______________ Signature Reserved for Final Version Approved by Heather Catron (Consultant Project Manager) Public Services 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 ....................................................................................................... 5 4.1 Laws, Plans, Policies, and Regulations .................................................................................... 5 4.1.1 Federal ......................................................................................................................... 5 4.1.2 State of Oregon ............................................................................................................ 5 4.1.3 City of Portland ............................................................................................................. 6 4.1.4 City of Portland 2035 Comprehensive Plan Goals and Policies .................................. 6 4.2 Design Standards ...................................................................................................................... 8 5 Affected Environment .......................................................................................................................... 8 5.1 Area of Potential Impact ............................................................................................................ 8 5.2 Resource Identification .............................................................................................................. 8 5.2.1 Published Sources and Databases .............................................................................. 8 5.3 Existing Conditions .................................................................................................................. 10 5.3.1 Public Safety and Emergency Response ................................................................... 10 5.3.2 Educational Resources .............................................................................................. 12 5.3.3 U.S. Postal Service .................................................................................................... 13 5.3.4 Waste Disposal .......................................................................................................... 13 5.3.5 Field Visits and Surveys ............................................................................................. 13 5.3.6 Point Resources ......................................................................................................... 13 5.3.7 Mobile Resources ....................................................................................................... 15 6 Impact Assessment Methodology and Data Sources ....................................................................... 16 6.1 Long-Term Impact Assessment Methods ............................................................................... 16 6.2 Short-Term Impact Assessment Methods ............................................................................... 16 6.3 Indirect Impact Assessment Methods ..................................................................................... 16 6.4 Cumulative Impact Assessment Methods ............................................................................... 17 7 Environmental Consequences .......................................................................................................... 17 7.1 Introduction .............................................................................................................................. 17 7.2 Pre-Earthquake Impacts.......................................................................................................... 17 7.2.1 No-Build Alternative.................................................................................................... 18 7.2.2 Enhanced Seismic Retrofit Alternative ....................................................................... 18 7.2.3 Replacement Alternative with Short-span Approach ................................................. 19 7.2.4 Replacement Alternative with Long-Span Approach ................................................. 21 7.2.5 Replacement Alternative with Couch Extension ........................................................ 21 7.3 Post-Earthquake Impacts ........................................................................................................ 22 7.3.1 No-Build Alternative.................................................................................................... 22 7.3.2 Enhanced Seismic Retrofit Alternative ....................................................................... 23 7.3.3 Replacement Alternative with Short-Span Approach ................................................. 24 January 29, 2021 i Public Services Technical Report Multnomah County | Earthquake Ready Burnside Bridge Project 7.3.4 Replacement Alternative with Long-Span Approach ................................................. 24 7.3.5 Replacement Alternative with Couch Extension ........................................................ 25 7.4 Construction Impacts ............................................................................................................... 25 7.4.1 Without Temporary Bridge ......................................................................................... 26 7.4.2 With Temporary Bridge .............................................................................................. 27 7.4.3 Potential Off-Site Staging Areas ................................................................................ 27 7.5 Cumulative Effects .................................................................................................................. 28 7.5.1 No-Build Alternative.................................................................................................... 28 7.5.2 Build Alternatives ........................................................................................................ 28 7.6 Compliance with Laws, Regulations, and Standards .............................................................. 29 7.6.1 No-Build Alternative.................................................................................................... 29 7.6.2 Build Alternatives ........................................................................................................ 29 7.7 Conclusion ............................................................................................................................... 30 8 Mitigation Measures .......................................................................................................................... 31 8.1.1 Enhanced Seismic Retrofit Alternative ....................................................................... 31 8.1.2 Replacement Alternative with Short-Span Approach ................................................. 31 8.1.3 Replacement Alternative with Long-Span Approach ................................................. 31 8.1.4 Replacement Alternative with Couch Extension ........................................................ 31 8.1.5 Construction Impacts Mitigation ................................................................................. 31 9 Contacts and Coordination ................................................................................................................ 32 10 Preparers ........................................................................................................................................... 33 11 References ........................................................................................................................................ 34 Tables Table 1. Impacted Public