Brown and Caldwell Inc. 2/3/2022

Port Gardner Storage Facility Scope of Work 1-06-22 Work Products • CAD Standards TM, draft and final • BIM Execution Plan (BXP), draft and final • Powerpoint presentations for each workshop • Brief meeting agendas and notes for workshops Phase 310 - Alternatives Analysis Objective Establish the basis for project elements prior to proceeding into the detailed design phases.Alternatives Analysis solidifies decisions so that detailed design can move forward with clear focus and mutual understanding to avoid costly rework down the road. Beginning with the Facility Plan, collaborate to establish design criteria for each discipline and conduct cost benefit analyses that include capital, 0&M, risks, and benefits. Activities/Approach: • Review Facility Plan recommendations and establish preliminary design criteria. Confirm Facility Plan flow design criteria for CSO storage and stormwater. • Conduct alternatives analysis for key facility features including basin cleaning(tipping buckets vs.flushing gates), grit and screening management, effluent pumping, control systems (level of automation and monitoring), stormwater conveyance and treatment and on- site O&M facilities. Prepare a brief TM (5- 10 pages)for each topic area including: o Flushing Systems o Pre-screening and Grit Removal o Pumping Systems o Electrical and Standby Power o Odor Control o Control Strategy, Monitoring, and Operations o Architectural Concepts and Criteria o Stormwater Management o Project Delivery • Conduct long term simulation modeling of the entire Port Gardner combined sewer system drainage area to verify proposed improvements are consistent with overall project goals. • Evaluate data availability related to the collection system to investigate whether a digital (smart utility) platform can be used to inform the decision making process for both CSO and stormwater facilities. Utility data may include items such as USGS rain gauges, cloud based rain forecasting models;along with coordination with existing hydraulic models as they relate to infiltration and inflow (I&I) and corresponding CSO flows. As follow up, hold preliminary conversations to coordinate and integrate smart utility aspects in the overall baseline control strategy for the new facility. A workshop will be held to discuss findings.A concise TM will be prepared to set the stage for further effort during detailed design. • Prepare Alternatives Analysis Report documenting outcomes of the analysis and recommendations.This will provide a basis for estimating the construction and annual 17