CHM2Hill Engineers Inc. 1/25/2021 Amendment 2

relative to various surrogate piloting options and other mechanisms to confirm the particle removal performance of the filters at high filter loading rates. Remaining Scope of Work: Jacobs staff will provide up to 20 hours of additional support to the City relating to coordination and review of the Pilot Test Plan with DOH. Participation in up to one virtual meeting with DOH may be included in this task. Presentation materials, agenda, and meeting minutes will be prepared by the City and reviewed by Jacobs. Remaining Deliverables: None Task 2 — Pilot Equipment Procurement, Setup, and Commissioning The City will continue to have primary responsibility for equipment procurement, setup, and commissioning. Current Status: All originally scoped work under task 2 has been completed, except for the review of the pilot system SOPs. The original task was scoped based on an assumption of 12 months of support and the actual task has lasted more than 72 months. Remaining Scope ofWork: Jacobs staff will provide up to 8 hours of additional commissioning support or SOP or data collection form review as requested by the City. Remaining Deliverables: None Task 3 — Pilot System Operation City staff will continue to have sole responsibility for operation, water quality analysis, and maintenance of the pilot system as described in the original Scope of Work. As part of Amendment No.2,Jacobs will take on additional responsibility around data reporting and filter run summaries to allow City staff to focus attention on running and optimizing the pilot system. Current Status: Jacobs has provided initial support of City pilot system operation,water quality analysis and data collection/compilation, maintenance,and run reporting to date. Exhibit A: Filter Re-Rating Pilot Study Scope of Work,Amendment No.2 Page 2 of 6