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CONSIDERATION OF APPROVAL, REJECTION, AMENDMENT, AND/OR POSTPONEMENT OF CONTRACT K-2021-129: A CONTRACT BY AND BETWEEN THE NORMAN UTILITIES AUTHORITY AND CAROLLO ENGINEERS, INC., IN THE AMOUNT OF $95,090 TO PROVIDE PROFESSIONAL ENGINEERING SERVICES FOR THE GROUNDWATER BLENDING AND TREATMENT SITE EVALUATION.
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BACKGROUND: The City of Norman / Norman Utilities Authority (NUA) currently owns and operates a well field with thirty-two (32) active groundwater wells and is currently constructing nine additional groundwater wells. The water produced from the groundwater wellfield is in compliance with all primary drinking water standards as established by the Oklahoma Department of Environmental Quality and the U.S. Environmental Protection Agency (EPA). Historically, groundwater systems which are in compliance with the standards set forth in the Safe Drinking Water Act and Oklahoma Administrative Code 252:631 Public Water Supply Operation are not required to provide treatment or residual disinfectant; however, the NUA also treats and distributes surface water from Lake Thunderbird. Since the water from both the surface water source and the groundwater wells is blended in the distribution system piping, ODEQ has indicated that, in the future, the water distribution system will need to be modified such that a minimum disinfectant residual of 1.0 mg/L of chloramines (NHCL2) should be found throughout all parts of the system. Additionally, the maximum contaminant levels (MCLs) for different constituents such as arsenic and total chromium may be lowered in the future by the EPA, and a new MCL for hexavalent chromium may be established, thus requiring additional treatment of the groundwater wells. Therefore, a centralized location to blend the groundwater wells and provide the necessary well water treatment before the groundwater is blended with the treated surface water, to meet current and future regulations is necessary. The work under this contract will ...
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