WRK Engineers 10/18/2018 - Laserfiche WebLink

E)CI-1113I T A SCOPE OF WORK Project Name: Trask Building Seismic Evaluation Location: 3025 Rucker Avenue, Everett, Washington PROJECT BACKGROUND The City of Everett is considering purchasing the Trask Building at 3025 Rucker Avenue. The existing building is a 3-story building that currently contains parking (on lower two levels) and commercial office spaces (on 3`d level). SCOPE OF BASIC SERVICES For the seismic evaluation, WRK Engineers (WRK) will use ASCE Standard 41-17, "Seismic Evaluation and Retrofit of Existing Buildings", published by the American Society of Civil Engineers(ASCE).ASCE 41 is the nationally recognized Standard for seismic assessment and strengthening of existing buildings.The goal of ASCE 41 is to identify the "weak links" in a building's lateral-force-resisting system that can lead to significant failure and/or collapse. In addition,ASCE 41 will identify typical nonstructural hazards that may pose a life-safety risk to occupants or business interruption (i.e. operations) risks to the building. rs ( The methodology utilizes a series of checklists to screen for possible seismic deficiencies (i.e.Tier 1 Screening). Checklists are included in the Standard for all of the major structural systems, nonstructural elements,and geologic and site hazards.The evaluating engineer addresses each statement and determines whether it is compliant or non-compliant. Compliant statements identify conditions that are acceptable. Non-compliant statements identify conditions that need mitigation or further investigation. WRK understands that a Tier 1 Screening was completed recently for this building by City of Everett staff. WRK anticipates using the Tier 1 Screening as the basis for starting their evaluation. However, the WRK evaluation will use the Tier 2 deficiency-based procedures in ASCE 41-17 to address all known non- compliant Tier 1 statements and determine appropriate, cost-effective strengthening measures. As required by ASCE 41-17, nondestructive examination of connections and conditions will be performed during our site walk-through. In addition,default material properties will be used in lieu of performing in- situ destructive testing. The WRK evaluation will be based on Life-Safety Structural Performance and Life-Safety Nonstructural Performance considering the BSE-1N earthquake event with a 10% probability of occurrence in 50 years (475 year mean recurrence period). In other words,WRK will evaluate the building for compliance with a level consistent with the Washington Building Code for new Risk Category Il Buildings.The WRK evaluation will not incorporate a reduced hazard level (i.e. using 75% of BSE-1N) as WRK understands the City of Everett would like existing and new buildings evaluated for the same seismic force levels for direct comparison. Based on the WRI< ASCE 41-17 evaluation, they will provide estimates of the expected seismic performance using three critical measures; Safety, Damage (Cost), & Recovery Time. WRK will use the methodology developed by the United States Resiliency Council (USRC) Building Rating system in conjunction with the Earthquake Performance Rating System (EPRS) developed by the Structural Engineers Association of Northern California (SEAONC). The USRC Building Rating system identifies Page 1 of 4 i Y