TranTech Engineering LLC 8/11/2022 Amendment 1

• Assist City with preparation of JARPA form for final Shoreline Permit review. Task 11 —Civil,Roadway& Drainage Design 11.1 Stormwater Analysis (Supplemented) Additional stormwater design and analysis services include: Drainage Report The Subconsultant will prepare an updated draft drainage report incorporating the additional detention pipe design as requested by the City and the additional design of the HDPE conveyance pipe daylighting at the southwest corner of the bridge that is out of the original Scope of Services. The draft drainage report will include the additional detention pipe and conveyance pipe daylight designs in the following sections: written assessment and summary of the surface water design features of the project, summary of tables, flow control calculations, pipe capacity calculations,pipe anchor calculations, and supporting exhibits. Deliverables: • Draft Drainage Report at 90%PS&E phase (electronic PDF copy) • Final Drainage Report 11.2 Detention Pipe The Subconsultant will modify the detention pipe location and update calculations to be included in the drainage report to incorporate the new detention pipe design as requested by the City. Revisions to the plans, opinion of cost, and specifications due to the detention pipe will be performed under another subtask of this supplement. Work Elements: • Coordination with the City, including preparing alternate design exhibits for coordination meetings. • Revisions to calculations for flow control and pipe conveyance. Deliverables: • Exhibits detailing alternate locations and sizes of detention pipe (electronic PDF copy) • Flow control calculations(to be included in the Drainage Report provided under Subtask 11.1 of this scope of services) • Pipe conveyance calculations(to be included in the Drainage Report provided under Subtask 11.1 of this scope of services) 11.3 HDPE Conveyance Pipe Daylight Design Page 13 City of Everett—Edgewater Bridge Replacement