TIC 2017-11-14 Item 2D - Contract Amendment #1 - Riverton Creek Flapgate Removal Design with OTAK Inc

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Exhibit A-1 Scope of Work Continued The preparation of final signed bid set plans and specs is removed from the scope. A final bid set can be prepared later once additional funding has been secured for construction. 5. I Final Design and Plans Sheets 4 Creek Grading, Trail Restoration, and Bank Armoring Design The scope for final design and plan preparation is revised as the City will perform all landscaping design for revegetation of Riverton Creek and for edge restoration along Green River Trail. The City will provide construction plan sheets for all landscaping features including the placement of Large Woody Debris (LWD). The City will also provide all planting details. Otak will provide the details for LWD. Otak will also provide electronic drawing files for the sheet titleblock and any civil basefiles that the City will need to prepare the landscaping sheets. Otak will revise the grading prepared previously (by others) to allow for channel side slopes with a maximum slope of 1.75'H : 1'V. It is assumed that this proposed slope will be able to be stabilized with a bio -engineered system with components such as LWD, rip -rap, plastic geocell, and biodegradable matting that is compatible with the City's design for slope vegetation. This scope does not include engineering for a mechanically stabilized earth wall or soil nails for channel slope stabilization. 6 Retaining Wall Design (3 sheets) The scope for final design and plan preparation is revised to include a retaining wall adjacent to the parking lot with greater vertical and horizontal extents. It is assumed that this wall will be a reinforced concrete retaining wall. A computer -modeled visualization is omitted from the scope. 5.2 Specifications The scope for this task is reduced as the City will lead the preparation of the master Contract Manual and the preparation of landscaped Special Provisions. Otak will provide General Special Provisions (GSP) and project -specific Special Provisions for Divisions 2 — 9, excluding the landscape and planting Special Provisions. The City will prepare Special Provisions for all landscape and planting work including topsoil, compost, seeding, and plant establishment. The City will prepare Division 1 of the Specifications and compile the master Contract Manual including all Contract and Bid Forms, Amendments to the WSDOT Standard Specifications, and Appendices. The City will incorporate Special Provisions provided by Otak. W:APW Eng\PROJECTS\A- DR Projects\Riverton Flap Gate Removal (99830103 98-DR03)\Consultant Selection\Phase 2\contract\Amendment #1\Riverton SOW_Amend 1_17_1027.docx 9 99