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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Benchmarking Technical Guidance Manual and 10 State Standards. The tank will be sized in accordance based on the land available to be acquired from Illinois Department of Transportation (IDOT) and the spacing needs to build and maintain the new tank. d) Evaluate a single preferred site identified by the City for the location of the new CT and storage facilities. The site for the new tank will be located immediately southwest of the existing tank.No other location will be considered. e) Participate in a preliminary meeting with the IDOT to discuss site access and any potential right-of-way considerations (one virtual meeting included). f) Develop conceptual designs for the following. i) CT through modifications to the existing ground storage reservoir ii) CT through a new, dedicated prestressed concrete cylinder tank. iii) CT through a new, dedicated cast-in-place concrete tank. g) For each alternative, prepare a preliminary site layout and conceptual design for integrating the new facilities while maintaining existing plant operations. The conceptual design will include yard piping, preliminary sequencing, and baffling. Identify preliminary,proposed IDOT right-of-way property line to accommodate new storage tank construction. h) For each alternative, develop a conceptual-level (AACE Class 5) cost estimate. i) Storage and Disinfection Tank Workshop i) Organize and facilitate one (1) virtual workshop(up to 2 hours)with the City to present the conceptual design alternatives. ii) A summary of the workshop, which may be in the form of meeting minutes and/or presentation slides, will be provided to document the decisions made by the City. 7) RESIDUALS AND LAGOON IMPROVEMENTS a) Lagoon Improvements i) Evaluate and develop a conceptual design for improvements to provide increased flood protection and improve access to the lagoons. The conceptual design will include the following improvements: (1) Upgrade the inlet and pump structure for the lagoons to accommodate an increase in flow, as provided by the City. (2) Conceptual design for the floodwall around Lagoon 1, 2, and 3 to approximate elevation 608 ft. ii) The conceptual design will include conceptual site plans and critical elevations based on publicly available USGS (or equivalent)topographic data. b) pH Adjustment i) Develop conceptual designs for the following alternatives for a pH adjustment system suitable for occasional use to meet the pH discharge limit of 9.0 when lagoon supernatant is discharged. Conceptual design will include preliminary design criteria and general arrangement on a site plan for the storage and feed system. (1) A new CO2 storage and feed system located at the lagoon site (2) A new hydrochloric acid storage and feed system located at the lagoon site. (3) A new CO2 storage and feed system located at the WTP with a feed line to the lagoon site. ii) Develop a conceptual-level (AACE Class 5)cost estimate for the proposed site improvements. The estimate will include the major components of the design, 6