WWTP DAF Building Improvements - Design Services Proj No. 123-031 – Black & Veatch Corp.

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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 Professional Services Agreement (PROJ00000435) DATE: July 17, 2023 The Division of Engineering and the Division of Wastewater recommend the Board of Public Works approval of a Professional Services Agreement with Black & Veatch Corporation for design and construction administration services for Project No. 123-031 DAF Building Improvements. Project Background The Dissolved Air Floatation (DAF) equipment at the Wastewater Treatment Plant was installed I the mid-1980’s as part of a larger improvement project. The three (3) DAF Units are over 30-years old and are at the end of their life cycle. Equipment repairs and changes in technology have led the Operations Staff to seek the replacement of these units and replace them with different technology. The design and construction administration contract will consider the various technologies available to provide adequate thickening. In addition to replacing the DAF Units, exterior yard piping will be replaced. Due to the severity of two separate breaks that occurred within a six-month period. Upon inspection, it was determined that the old ductile iron pipe and its cement lining have eroded and worn down the interior of the pipe due to the solids and grit. The thin cross section of the pipe caused the pipe to become very brittle when grit is pumped to the Degrit Building for solids separation, and it is suspect to continued failures. The yard piping between the Compressor Building Basement and the Degrit Building will be replaced. Other pumping equipment will be assessed during this contract. Construction costs will dictate the final scope of work for design and construction. Refer to the Professional Services Contract documents for additional detail on the scope of work. 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.