1. Conduct site visits and review relevant documents, studies, and other background information a. This may involve entering confined spaces. 2. Work in close coordination with the City’s project manager throughout the duration of the project. a. Meet regularly to ensure the project remains on schedule and within budget. b. Meet regularly to refine the scope of work, recognizing that not all tasks may be necessary, tasks may be expanded or added, and the sequence of tasks may change during the project. 3. Perform a bathymetric survey. a. Identify location, depth, size, and material of all piping and structures. b. Install survey grade markers for future locating. c. Perform topographic survey to supplement bathymetric where piping enters the shoreline. d. Delivery of completed survey in both electronic pdf format AND AutoCAD drawing file. 4. Perform hydraulic model development, calibration, and analysis of the lakeline a. The existing sewer model, developed using the MIKE URBAN / MIKE+ (DHI) platform, currently covers only the Mercer Island Town Center area. b. City Project 25-28 – General Sewer Plan will expand the model to provide system-wide coverage. c. The hydraulic model developed under this task shall build upon both the existing Town Center model (a) and the forthcoming Island-wide model (b). d. Deploy flow meters, rain gauges, and other measures to support model development. e. Deliver a technical memo that summarizes findings and provides location specific recommendations. 5. Identify suitable temporary and/or permanent lakeline access options. a. In-lake manholes and cleanouts such as submerged or under dock structures. b. On shore access structures in existing or new locations. c. Access points shall allow for hydro-jet cleaning, solids removal, CCTV inspection, direct monitoring of hydraulic conditions, and temporary bypass. d. Deliver a brief technical memorandum and/or workshop that summarizes findings and provides location specific recommendations. 6. Complete lakeline access design that incorporates improvements from (5). a. 30% Design – Plans and specification table of contents. b. 60% Design – Plans, specifications, and preliminary engineer’s estimate. c. 90% Design – Plans, specifications, and engineer’s estimate. d. 100% Design (Bid-Ready) - Plans, specifications, and final engineer’s estimate. e. Conformed Construction – Plans and specifications 7. Perform Lakeline Condition Assessment a. Review CCTV inspection of lakeline, if available b. Analyze pipe degradation through destructive and/or non-destructive measures (i.e. pipe coupons, ultrasonic measuring, or other emerging technologies). c. Determine remaining useful life (RUL) of pipe segments. d. Identify and prioritize improvements according to level of risk. e. Deliver a report that summarizes the findings. 8. Complete design for identified improvements, as well as for any emergency repairs that may arise. a. 30% Design – Plans and specification table of contents. b. 60% Design – Plans, specifications, and preliminary engineer’s estimate. c. 90% Design – Plans, specifications, and engineer’s estimate. d. 100% Design (Bid-Ready) - Plans, specifications, and final engineer’s estimate. e. Conformed Construction – Plans and specifications 9. Provide permitting support as needed for each task. At a minimum, it is expected that in-water work will require coordination with the following agencies: a. City of Mercer Island Community Planning and Development for SEPA compliance, land use permits, shoreline permits, grading and drainage permits, right of way use permits. b. Washington Dept. of Fish and Wildlife (WDFW) for hydraulic project approval c. Dept. of Ecology for construction general and shoreline permits, or variance review. d. US Army Corps of Engineers (USACE) for compliance with Section 404 of the Clean Waters Act and Section 10 of the Rivers and Harbors Act of 1899. 10. Provide public outreach support as needed for each task. a. Assist in fielding questions received, developing exhibits, renderings, or other media, and supporting City staff as needed. b. Assume City staff will take the lead on managing project webpages, organizing community meetings, and distributing project mailings and other construction/work notifications. 11. Provide engineering support during the bidding process – pre-bid meeting attendance, respond to bidder questions, and issue addenda. 12. Provide engineering support during construction – pre-construction meeting attendance, RFI/submittal review, and the option for construction inspections.
