Amendment No 1 to OEA - WWTP DAF Building Improvement Proj No. 123-031 - Black & Veatch

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INTER-OFFICE MEMORANDUM DEPARTMENT OF PUBLIC WORKS DIVISION OF ENGINEERING TO: Members of the Board of Public Works Michael Schmidt, Assistant City Attorney Public Works Theresa Heffner, Clerk of Board of Public Works FROM: Jacob M. Klosinski, P.E., Assistant City Engineer SUBJECT: 123-031 WWTP DAF Building Improvements Amendment No. 1 (PROJ00000435, PO-0025188) DATE: April 2, 2024 The Division of Engineering and the Division of Wastewater recommend the Board of Public Works approval of an Amendment to a Professional Services Agreement with Black & Veatch Corporation for additional design services for Project No. 123-031 DAF Building Improvements. Amendment Scope During evaluation of existing equipment in the preliminary design phase of the contract, the existing polymer system was identified to be undersized for the amount of polymer that will be required for the equipment replacing the Dissolved Air Floatation (DAF) equipment at the Wastewater Treatment Plant. Equipment selection for the new equipment will include new Gravity Belt Thickeners (GBT’s). The Gravity Belt Thickeners were evaluated to have a lower capital cost and the existing polymer systems is not capable of feeding the volume of polymer needed for normal operations or high flow conditions. This scope of work includes evaluation of liquid and dry polymer systems and the design of the layout, equipment and controls required to adequately feed polymer to the proposed Gravity Belt Thickener units. This project will be funded through Sewage Works, Wastewater Capital Account 642- 06-605-514-442005. For questions regarding the subject agenda request, contact Jacob M. Klosinski, P.E. (Ext. 9496) at the Division of Engineering. Attachments:  Amendment No. 1  Personnel Hours Justification