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PAGE 2 of 3 <br />2. Chlorine Residual Maintenance: Procedures for monitoring and maintaining target chlorine <br />residuals, adjusting operational setpoints, and responding to low-residual conditions to minimize <br />DBP formation while maintaining regulatory compliance. <br />Carollo will present draft SOP content during bi-weekly coordination meetings with City staff. One round of <br />City review and comment will be incorporated into the final SOPs. <br />Task 2 Deliverables <br /> Draft SOP documents <br /> Final SOP documents incorporating City comments <br />Task 3 Feasibility of Road, DBP Control, and Power Improvements (CAP/OER Action Items LT-1 <br />and LT-2) <br />Carollo will evaluate the feasibility of providing permanent access road improvements to Tank 1300, 1600 <br />and 1160; improving DBP control measures and/or converting to chloramination and providing nitrification <br />control measures; and improving/extending power to all three tank sites as required. The feasibility <br />assessment will be conducted in coordination with the City and relevant stakeholders, as appropriate, and <br />will address planning-level considerations necessary to inform future design and implementation. <br />The evaluation will include development of preliminary access road alignment concepts, an initial biological <br />constraints assessment, and an assessment of options for extending electrical power to the site. For DBP <br />controls the evaluation will consider continuous mixing, analyzers, and automated control systems. For <br />conversion to chloramination, the evaluation will consider RCS technology (on-site generation vs. bulk <br />chemicals), chemical delivery constraints, and nitrification control measures. <br />Planning-level capital cost estimates will be prepared for recommended alternatives. The assessment will <br />identify any fatal flaws that could preclude implementation, as well as key biological and environmental <br />factors that may affect construction scheduling and permitting requirements. Potential mitigation measures <br />to address identified constraints will also be summarized. <br />This task also includes a site visit that will include the road, power, and biological teams. <br />Task 3 Deliverables <br /> Draft Feasibility Assessment Technical Memorandum <br /> Final Feasibility Assessment Technical Memorandum incorporating City comments <br />Task 4 Hydraulic Modifications Evaluation (CAP/OER Action Items ST-1D and ST-2B) <br />Carollo will coordinate with the City’s water system hydraulic modeling consultant to evaluate water age <br />under alternative operations and identify strategies that support more frequent cycling and lower residence <br />times. Carollo will also coordinate with the City’s water system hydraulic modeling consultant to evaluate <br />increasing flow from Turnouts 1 and 4 relative to Turnout 5, potentially increasing groundwater fraction <br />from Zone 7 if needed based on their operation to the Kilkare pressure zones. The evaluation will consider <br />multiple operational scenarios, including alternative source routing and system operations strategies, to <br />assess feasibility and potential impacts on system performance. Planning level cost estimates will be <br />provided for any strategies requiring new or modification to existing infrastructure. <br />Carollo will summarize preliminary findings during bi-weekly coordination meetings with City staff. A <br />technical memorandum documenting the evaluation methodology, assumptions, scenarios analyzed, and <br />key findings will be prepared for City review. Summary conclusions and recommendations from this <br />evaluation will also be incorporated into the DDW Progress Report prepared under Task 5. <br />Docusign Envelope ID: 271FE856-C5AE-4E67-BBDD-ED81F3311151