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COStantec August 6,2019 Page 5 of 14 and observe the facilities over the course of two 4-hour site visits focused on different elements of the facility. Based on this information,we will provide findings regarding the need for repairs, upgrades or replacement. Northwest Corrosion will support the evaluation relative to concrete structure,coating system,supports, and mechanical equipment condition. This condition assessment will include: • Plant influent piping and diversion structure • Plant and yard piping • Process mechanical equipment • Process structures(tanks, basins,etc.) • Process and operational support structures(buildings) • Electrical, instrumentation and controls systems • Site access and circulation facilities(roadways, pavement,etc.) • Site security measures (fencing,alarms,etc.) • Flood protection facilities(levees) The electrical, instrumentation and control (EI&C)systems will be evaluated to determine where upgrades may be needed and how the systems support the current operational approach.Where staff have identified the need for additional or modified/upgraded instrumentation and control logic,Stantec will consider and recommend options for improvement. Subtask 300.002 Seismic Resiliency Stantec will assess the ability of the WPCF facilities, including the plant process piping, buildings,water bearing structures, levees, diversion structures, influent and effluent pipelines to withstand a seismic event.The buildings and water bearing structures will be evaluated with ASCE41-13 Seismic Evaluation and Retrofit of Existing Buildings as the main reference standard,Tier 1 Screening Checklists will be the basis for evaluation.This subtask will focus on seismic resiliency concerns; however,the evaluation will need to consider future sea level and flooding conditions as these may impact conclusions and recommended improvements. The report will identify the most critical deficiencies and suggest future projects to provide reliable operation and function following a seismic event. Subtask 300.003 Climate Change Resiliency To assess the critical conditions under which sea level rise and flooding may present challenges to the existing WPCF compliant operation,Stantec has included on our team WEST Consultants, Inc.,who have developed a model of the Snohomish River. We anticipate coordinating with WEST and the University of Washington Climate Impacts Group to assess river elevations under critical future conditions. This may impact conclusions of the adequacy of the existing levees on Smith Island to prevent flooding of the WPCF site, as well as the adequacy of systems such as the effluent discharge facilities to operate under increased receiving water elevation in the future (i.e. discharge head). Subtask 300.004 Desktop Geotechnical Evaluation The overall condition assessment will include a geotechnical desktop evaluation to support assessment of plant infrastructure condition and performance under existing static loading, as well as identify specific areas of vulnerability which would be anticipated under seismic loading and/or sea level rise and climate change(flood hazard). The site is located within the Snohomish River floodplain, and subsurface