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BACKGROUND Well #5 is one of three potable water production wells owned and operated by the City. It is a 200 horsepower deep well submersible motor pump made by manufacturer Byron Jackson which is owned and distributed by Flowserve Corporation. Well #5 typically produces up to 8 percent of the city's total drinking water used throughout the year. The replacement of Well #5 was authorized by Council on December 5, 2017 with a repair schedule and cost estimates based on normal weekday labor pay rates. However, due to the unique traffic and pedestrian challenges inherent to the work zone, on February 20, 2018, Council approved a change order for additional overtime pay estimated at $29,880, to shift as much of the work to the weekend. The weekend overtime actual cost was $12,220, leaving a project balance of$17,660 to be used toward the well rehabilitation work estimated at $77,389. DISCUSSION Following the removal of the well's pump, Utilities staff performed a video inspection of the well casing and discovered that 65-75 percent of the screened sections of the well are plugged with encrustation and mineral deposits that can reduce well efficiency and can potentially damage the pump in the future. With the project underway and most of the well's components removed, this would be the ideal and most cost-efficient time to perform the well rehabilitation. The requested change order for the well rehabilitation portion of the project is $59,709. Funding is available for the additional cost and is outlined in Attachment 1. Submitted by: Fiscal Review: Approved y: .\N\.,,NN\r\ XviA- Kathleen Yurchak Tina Olson Nelson Fialho Director of Operations Director of Finance City Manager and Water Utilities Attachment: 1. Attachment 1 — Project funding 2. Well #5 replacement cost from Pump Repair Service Co. 3. Well #5 Eaton Pumps Sales & Service rehabilitation proposal and cost estimate Page 2 of 2