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Scope of Work <br />continued <br />City of Everett 5 <br />Dorn Ave. Drainage Improvements Otak <br />along 204 Dorn Avenue and 9011 Evergreen Way (AFN 9204140900) will be utilized to the extent <br />feasible. <br /> <br />TASK 3 DELIVERABLES <br /> 2022 Civil 3D drawing and digital terrain model <br /> Table of property/easements and easement dimensions with graphic in CAD <br /> Monument removal permit in PDF format, if applicable <br /> Up to 8 legal descriptions and exhibits for acquisitions in PDF format <br /> <br /> <br />TASK 3 ASSUMPTIONS <br />· The City will coordinate with private property owners for access for the survey activities. <br />· Private utility locates might be needed based on the markings by Washington 811. <br />· Otak will obtain preliminary title reports. <br />· A separate field visit is anticipated for surveying the pothole locations. <br />· City has provided an electronic drawing of Metron’s topographic survey. <br /> <br />4. Drainage Analysis <br /> <br />4.1 Hydrologic and Hydraulic Model Updates <br />This task will update the hydraulic modeling to reflect the proposed 60% design and confirm 25-year flood <br />protection. The model will be updated to support the Task 6 – Options Analysis for Solution Element 2, to <br />mitigate McGill Avenue flooding, and to design flow splits at the water quality treatment devices (Dorn and <br />McGill). The model will also be used to quantify downstream impacts. Prior modeling of Solution Element <br />2 options showed similar impacts to North Creek by peak flows being dampened by McGill Pond or the <br />direct outfall offsetting the timing of peak flows. <br /> <br />4.2 Hydrologic and Hydraulic Memorandum <br />A Hydrologic and Hydraulic Memorandum summarizing hydraulic results, water quality treatment sizing <br />and any flow splits, and downstream impacts in North Creek at the Dorn Avenue and McGill outfalls. The <br />Hydrologic and Hydraulic Memorandum will be based on of Section 3 – Hydrology & Hydraulics and <br />Section 4 – Conceptual Water Quality Treatment from the Evergreen Way Flood Reduction Alternatives <br />Analysis, January 19, 2024, by Otak. <br /> <br />TASK 4 DELIVERABLES <br /> Electronic versions of the updated proposed condition hydraulic models. <br /> Hydrologic and Hydraulic Memorandum (draft and final). <br /> <br />TASK 4 ASSUMPTIONS <br /> No changes to the hydrologic and hydraulic modelling will be made after the 60% submittal.