Tulalip Reservation Hazard Mitigation Plan Tulalip eservation azard Mitigation Plan (THIS PAGE LEFT INTENTIONALLY BLANK) Prepared by Glenn B. Coil University of Washington, Seattle In coordination and with the assistance of Tulalip Office of Neighborhoods Lynda Harvey Debra Muir November 1, 2004 (THIS PAGE LEFT INTENTIONALLY BLANK) The Tulalip Tribes November 1, 2004 Table of Contents 1. Introduction..............................................................................................................1-1 1.1. Background......................................................................................................1-1 1.2. Purpose and Mission........................................................................................1-2 1.3. Policy Framework for Washington..................................................................1-2 1.4. Plan Criteria and Authority..............................................................................1-2 1.5. Document Overview ........................................................................................1-4 2. Community Profile...................................................................................................2-1 2.1. Tulalip Reservation History.............................................................................2-1 2.2. Geographic Setting...........................................................................................2-3 Lakes, Rivers and Streams.......................................................................................2-3 Hills and Mountains.................................................................................................2-4 Soils and Geology....................................................................................................2-4 Climate.....................................................................................................................2-7 2.3. Land Use and Future Development Trends .....................................................2-7 Zoning and Future Land Use ...................................................................................2-8 2.4. Demographics ................................................................................................2-17 2.5. Economy ........................................................................................................2-23 Development Trends..............................................................................................2-23 Industry ..................................................................................................................2-23 Occupation .............................................................................................................2-24 2.6. Laws and Ordinances Influencing this Plan...................................................2-26 Federal....................................................................................................................2-26 Tribal......................................................................................................................2-26 3. Planning Process ......................................................................................................3-1 3.1. Steering Committee .........................................................................................3-1 3.2. Stakeholder Group Members ...........................................................................3-1 3.3. Public Involvement ..........................................................................................3-4 3.4. Plan Preparation...............................................................................................3-4 4. Risk Assessment ......................................................................................................4-1 4.1. Methodology....................................................................................................4-2 Assess Hazard ..........................................................................................................4-2 Determine Exposure.................................................................................................4-2 Assess Vulnerability ................................................................................................4-2 Data Sources ............................................................................................................4-2 4.2. Presidential Declared Disasters........................................................................4-3 4.3. Critical Facilities and Infrastructure ................................................................4-4 Hazardous Materials ................................................................................................4-9 4.4. Earthquakes....................................................................................................4-11 Definitions..............................................................................................................4-11 General Background ..............................................................................................4-11 Hazard Profile ........................................................................................................4-14 Secondary Hazards.................................................................................................4-22 Exposure Inventory................................................................................................4-23 Hazard Mitigation Plan i November 1, 2004 The Tulalip Tribes Vulnerability ..........................................................................................................4-26 Loss Estimation......................................................................................................4-26 4.5. Flood ..............................................................................................................4-33 Definitions..............................................................................................................4-33 General Background ..............................................................................................4-36 Hazard Profile ........................................................................................................4-36 Exposure Inventory................................................................................................4-38 Vulnerability ..........................................................................................................4-40 Loss Estimation......................................................................................................4-40 4.6. Landslides ......................................................................................................4-47 Definitions..............................................................................................................4-47 General Background ..............................................................................................4-47 Hazard Profile ........................................................................................................4-49 Secondary Hazards.................................................................................................4-52 Exposure ................................................................................................................4-53 Exposure Inventory................................................................................................4-53 Vulnerability ..........................................................................................................4-55 Loss Estimation......................................................................................................4-55 4.7. Severe Weather ..............................................................................................4-59 Definitions..............................................................................................................4-59 General Background ..............................................................................................4-60 Hazard Profile ........................................................................................................4-61 Secondary Hazards.................................................................................................4-65 Exposure Inventory................................................................................................4-66 Vulnerability ..........................................................................................................4-66 Loss Estimation......................................................................................................4-66 4.8. Tsunami/Seiche..............................................................................................4-67 Definitions..............................................................................................................4-67 General Background ..............................................................................................4-67 Hazard Profile ........................................................................................................4-68 Secondary Hazards.................................................................................................4-71 Exposure Inventory................................................................................................4-71 Vulnerability ..........................................................................................................4-73