Utility Committee Agenda and Packet 2020 08 11

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Program(s): Sub-Program(s): Funding Source(s): Percent Utilities Water Water Utility Fund 100% 100% Equipment or Year 1 Year 2 Year 3 Year 4 Year 5 Year 6 Six -Year Project Costs 2021 2022 2023 2024 2025 2026 Total Land Acquisition - - Design & Engineering - - - - - - - Other Prof Services - - Construction 600,000 - - - - - 600,000 Other Equip/Project Costs - - Capital Equipment Purch - - - - - - - Contingency - - 600,000 - - - 600,000 Total Costs (Gross) Grants or Other Off -Setting Revenue - - - - - - - Impact to Annual Maint/Operating Costs - 0 Description & Proposed Funding: Equipment/Project Description: This project allows for the evaluation and design of a solution(s) for the sediment loading that is experienced from Marshall Lake. Possible l solutions that will be evaluated are: sediment basins, dredging and/or JE • modifications to the outlet works. This improves the ability to treat water as it makes the raw water properties more consistent. Project revenue or grants that will support the project and the impacts to the operating budget: No grants have been identified at this time. Annual maintenance is not expected to change. A." �'„ pit► d . - Reference to Plan being implemented (i.e., Master Plan): Justification and Alignment with Program/Sub-Program Goals & Key Performance Indicators: Project assesses the best collection techniques, location and position of improvements to enhance and treat raw water from Marshall Lake. A recent diver inspection of the Marshall Lake Outlet revealed that current sediment levels have reached the same level of the Outlet Structure. Sediment levels in this area are estimated at approximately 5 feet above the reservoir bottom. This project will address the immediate need of dredging this material and development of possible long term maintenance solutions to prevent future build up. The reduction in sediment loading in the raw water will improve the entire treatment process by requiring less chemical consumption, fewer backwashes of the filters and lowering the amount of solids sent to the drying beds and discharged to the WWTP. All of these items result in better efficiency and cost savings. Additionally, long term water supply strategies contemplate delivering this water to Harper and Louisville Reservoirs. This project will look to prevent transporting this problem to these downstream reservoirs. Department Priority Ranking: High Request Number: (F nce Use)