R2026-124 Resolution Authorizing Agreement with Burns and McDonnell Engineering Company, Inc., to Provide Professional Engineering Services to the City of Decatur for the South Water Treatment Plant Expansion Plan, City Project 2025-03

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BURNS .. McDONNELL- June 5, 2026 EXHIBIT A Robert Weil, PE, MSCE, MEd Water Production General Manager 1155 S Martin Luther King Jr. Drive Decatur, IL 62521 RE: Proposal for Engineering Services South Water Treatment Plant Expansion Plan Dear Mr. Weil: Burns & McDonnell Engineering Co., Inc. (BMcD)has prepared a Scope of Services (Scope) per your request for engineering services for the South Water Treatment Plant(SWTP) Expansion for the City of Decatur(City). BACKGROUND The City is experiencing a period of significant industrial growth,positioning it as a key economic hub in the region. This growth is projected to place substantial new demands on the City's drinking water infrastructure. The SWTP currently has a nameplate capacity of 36.0 MGD and operates with a reserve capacity that will be reduced once the new industrial demand comes online. In response,the City issued a Request for Qualifications and Proposals for this SWTP Expansion plan project(Expansion Plan). The purpose of this Expansion Plan is to perform data collection, analysis, and preliminary, conceptual engineering for future capital projects to be incorporated into the City's overall Capital Improvements Plan(CIP).The findings and conceptual designs will be summarized in a preliminary design report, which is the primary deliverable to be prepared under this Scope. Some of the capital projects will require an evaluation of multiple alternatives, which will be included in the preliminary design report.After the City selects the desired alternative, a final conceptual design of the selected alternative will be prepared as part of a subsequent authorization of services. The Expansion Plan will include an estimate of the maximum allowable buildout capacity of the SWTP and address several key areas critical to the SWTP's long-term reliability and resilience, including: • Capacity and Treatment Enhancements: Evaluating alternatives to increase treatment capacity and improve the performance of core processes like clarification, filtration, and storage. • Regulatory Compliance: Addressing ongoing challenges with Disinfection Byproducts (DBPs) and preparing for the treatment of potential emerging contaminants. • Security and Resilience: Incorporating physical and cybersecurity improvements as highlighted in the City's 2025 Risk and Resilience Assessment(RRA). This Expansion Plan is a continuation of planning efforts undertaken by the City. Several of the evaluations included in this scope, particularly those related to disinfection, storage, and filter media,will build upon the findings and data from the ongoing Disinfection Byproduct Reduction Study report drafted by BMcD. This approach will further drive the understanding of the SWTP's water quality and operational needs, allowing the City to make strategic, data-driven investments for the future. 1