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Consent Item Indian River County, Florida Department of Utility Services Board Memorandum Date: March 27, 2024 To: Indian River County Board of County Commissioners Through: John A. Titkanich, Jr., County Administrator Sean C. Lieske, Director of Utility Services From: Howard G. Richards, PE, Manager—Capital Projects Prepared by: Harrison Youngblood, PE, Utilities Engineer Subject: TLC Diversified, Inc. Change Order 4 and Kimley-Horn and Associates, Inc. Work Order 6 Amendment 2 for Oslo Water Treatment Plant Improvements Descriptions and Conditions: The Indian River County Department of Utility Services (IRCDUS) operates two water treatment plants (WTP), Hobart WTP and Oslo WTP, to provide potable water service to its customers. Both plants have a combined capacity of 25.7 million gallons per day (MGD) and an average daily flow of approximately 12 MGD. The treatment facilities obtain raw water from the upper Floridan aquifer and treat it with nanofiltration. Pretreatment for the membranes includes addition of sulfuric acid and a scale inhibitor. The permeate from the nanofiltration process is blended with raw water and the blended water has chlorine added for disinfection. In addition, fluoride is added for fluoridation and lime, carbon dioxide and sodium hydroxide are added for remineralization, pH and alkalinity control as well as calcium carbonate stability. An evaluation of the membrane system and associated equipment at the Oslo WTP determined they needed rehabilitation and replacement. The condition assessment evaluated the reliability of the existing mechanical equipment, including the membrane booster pumps; reverse osmosis (RO) trains; feedwater, permeate, and concentrate piping; pipe trenches; membrane skids; small piping systems; and high service pump distribution piping systems. On December 17, 2019, the Indian River County Board of County Commissioners (BCC) awarded Work Order (WO) 1 to Kimley-Horn and Associates (KHA), pursuant to Request for Qualification (RFQ) 2019070 for Professional Services for Water Plant and Water Resources Engineering Services awarded November 5, 2019, to provide design, permitting, and bidding phase services for the Oslo WTP Improvements project, in the amount of $568,249.00. Amendment 1 to Work Order 1 was issued on October 6, 2020, to address further items in the project, which increased WO 1 by $127,252.00. On June 15, 2021, the BCC approved WO 6 to KHAto provide professional services to oversee the construction phase of the project in the amount of $1,222,545.00. Amendment 1 to WO 6 was issued on November 7, 184