TIC 2017-04-11 Item 2B - Agreement - Riverton Creek Flapgate Removal Design with OTAK Inc

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Exhibit A - Scope of Work Riverton Creek Flapgate Removal Project City of Tukwila April 03, 2017 Otak Project No. 32740 Introduction and Background Tukwila has adopted policies to identify and restore habitat and ecological function along the Duwamish River where restoration can succeed with existing conditions and adjacent uses. The removal of flapgates and perched culverts at the outlet of Riverton Creek is a key opportunity to remove a fish barrier and re -open a historical stream outfall and restore rearing and migrating habitat adjacent to the Duwamish. For this project, the City is requesting Otak to finalize the design of the Riverton Creek Flap Gate Removal improvements initiated by a previous consultant working for the City. This will include taking the 75- percent design to final design and preparing construction documents, updating environmental assessment reports and technical supporting documents, and providing technical support to obtain permits. This project may also include construction support services. Based on our discussions with the City, the project will be accomplished in two phases — Phase 1 - Intake Review and Charter Meeting, Phase 2 - Permitting and Final Design. If construction support or other supplemental services are requested, a supplement will be submitted to add Phase 3 services. This scope of work describes activities within the first two phases — initially with broad terms, and then with specific tasks for each phase. Phase I— Intake Review and Charter Meeting The first step we will take is performing a detailed review of the 75- percent design including all reports and supporting documentation made available by the City. This review will include a field visit to assess the existing conditions and note any discrepancies from the data and descriptions from the 75- percent design which was performed from 2009 -2011. The Intake Review will also include development of a simple Permitting Strategy Plan that identifies all regulatory requirements and design criteria for various agencies so that permitability of all project elements can be confirmed. After the Intake Review, we will facilitate a project Charter Meeting with Tukwila to assess how project challenges have been addressed as part of the completed existing design (75- percent level) and what will need to be addressed by the Otak team. After the Charter Meeting has been completed, but prior to completion of Phase 1, Otak will review the scope of work for Phase 2 and, if required and authorized by the City, make any adjustments in the scope, schedule and budget for City review and contract processing. Upon completion of Phase 23