Brown and Caldwell Inc. 3/3/2021 Amendment 2

Activities/Approach: • Contact pipe testing laboratories to determine options for testing representative samples of the existing hypochlorite pipe to estimate the remaining useful service life of the existing piping_ • Develop a cost estimate for pipe material testing and recommendations of locations for gathering pipe samples within the hypochlorite facility. • Contact pipe manufacturers and suppliers to identify the universe of the pipe materials suitable for conveying hypochlorite solutions. • Assemble performance data and market availability for each pipe material. • Gather pipe and fitting material costs from pipe suppliers and develop a representative cost estimate for the replacement of the hypochlorite pipe. • Compare the available pipe materials based on performance characteristics, representative cost estimates, and operation and maintenance criteria. • Develop a recommendation for the pipe material best suited for the replacement of PVC hypochlorite pipe. Review recommendations with BC senior technical staff. • Develop a short(maximum 10 page)technical memo summarizing pipe material alternatives and a recommendation for replacement pipe material. Everett Responsibilities • Provide input pipe material evaluation criteria. Work Products • Sodium Hypochlorite Pipe Material Replacement Analysis technical memorandum, draft and final. Task 111b.Generator Design Review(completed) Activities/Approach:The City requested that BC provide advisory review related to the City's Water Filtration Plant generator replacement project. Specifically, BC was requested to review draft interim design materials, and to provide feedback on key considerations that the City should take into account in selecting voltage for a new power generation system at the WFP. Support includes: • Review design and background materials provided by the City • Participate in conference calls with City staff to verify understanding of operational needs and discuss key considerations for City staff • Deliver feedback in the form of written and verbal key considerations for generator selection Everett Responsibilities • Provide design and background materials to support the review. • Participate in design review conference calls. Work Products • Written and verbal key comments on key considerations for City selection of a new medium voltage (12.47 kV) or low voltage (480V) replacement generator system. Task 111c. Finished Water Pump Station Assessment(partially completed.future work remaining) Activities/Approach:To be determined, based on City requests. No work will be completed under this task without written direction from the City. Page 3 of 8