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ER <br /> Assumptions <br /> 1. The consultant team will not develop new predictions of the impact of climate change on <br /> rainfall. <br /> 2. The model workshop will be held at the end of the alternative evaluation and be no <br /> longer than four (4) hours in duration. Attendees will include HDR staff (up to two[2]) <br /> and City staff. <br /> Deliverables <br /> 1. Draft and Final text and exhibits describing the results of the model analysis will be <br /> developed under Task 400. <br /> Task 300 — Conveyance Alternative Development <br /> Task Objective <br /> In conjunction with the modeling performed in Task 300 develop conveyance strategies to route <br /> combined and stormwater flows to the PGSF and return the flows to the City wastewater <br /> conveyance system or to the DWO. <br /> Subtask 301 — Conveyance System Review <br /> Consultant Services <br /> 1. Coordinate a workshop with City staff and consultant team, including modeling staff, to <br /> review current wastewater system configuration, review recent changes in the <br /> conveyance system, identify pipelines that may be repurposed, and begin to identify <br /> conveyance routing alternatives. <br /> 2. Identify conveyance system criteria and objectives including redundancy, reliability, <br /> operational simplicity, and cost. Prepare an initial list of alternative evaluation criteria. <br /> Candidate evaluation categories and criteria are engineering feasibility/cost (including <br /> construction methods evaluation, e.g., open cut, micro tunnel, HDD, pipe bursting, etc.), <br /> existing utility conflicts; land rights costs and property impacts. <br /> 3. Based on modeling analysis of the collection system identify feasible conveyance <br /> options for combined sewer flows, separated and treated storm water flows, and <br /> untreated storm water flows. <br /> 4. Document the conveyance system locations outside of the PGSF basin that have the <br /> potential for routing flow to PGSF. <br /> Client Responsibilities <br /> 1. Coordinate system reviews with representatives from the City's Water Pollution Control <br /> Facility (WPCF) and the Technical Services Group (TSG). <br /> 2. Provide a meeting room and schedule a full day workshop to review the existing system <br /> and visit areas within the collection system. <br /> 3. Conduct CCTV inspection of existing sewers to support the evaluation of alternatives. <br /> Assumptions <br /> 1. Conveyance system review workshop will be one full day with up to three (3) HDR staff. <br /> City of Everett—Port Gardner Storage Facility 8 Scope of Services <br />