HDR Inc. 4/19/2022 - Laserfiche WebLink

EXHIBIT A Feasibility Study Consultant Tasks: Develop a feasibility study to evaluate specific project elements and determine any fatal flaws that would render the project not viable. The key elements of this project that require evaluation include: • Manage the project including project set up, developing a brief internal project management plan, monitoring the progress of the project invoicing and project closeout. • New conveyance piping. • Constructing a new pipeline crossing on Lowell Street under an Interstate 5 overpass. • Constructing a new crossing under BNSF tracks. • Constructing a regional treatment facility and storm drain outfall to a wetland. • Constructing treatment facility in parking area with storm drain outfall to river. • Discharging stormwaterto an existing wetland. • Discharging stormwaterto river with new outfall. • Class 5 opinion of probable costs. Factors that will be evaluated include: • Evaluate property req uirements. • Design concepts. • Wetland Assessment and evaluation of Stormwater Minimum Technical Guidelines regarding discharge of stormwater to existing wetland. • Identify permits required to construct the project under each option. • Identify potential fatal flaws, and potential concerns associated with each option. Assumptions: • The sizing of the project elements will be taken as preliminarily identified by the City in the figures presented earlier. • One site visit by key personnel. • The analysis will be based on basin criteria included in the City of Everett 2017 comprehensive storm water plan data. For the combined sewer basin the estimated flow will be established by using the flow to area ratio from the adjacent basins. • Water quality modeling for sizing the treatment facility will performed based on land use information provided by the City. • Potential stakeholders and permitting agencies include: o WSDOT o Ecology o BNSF o Marshland Flood Control District o City of Everett Parks o City of Everett Community, Planning and Economic Development o United States Army Corps of Engineers o Private properties o Indian Tribes • The Marshland Flood Control will be contacted by the City. • City PM will coordinate communication with other City departments. • No private property owners will be contacted. • The internal project management plan is intended for HDR use but is available to Everett upon request. 929 108th Avenue NE,Suite 1300,Bellevue,WA 98004 T 425.450.6200 hdrinc.com