Agmt23 BKF Engineers Tract Pump Station Improvement Project

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REV: 11-07-23 SK Changes will be limited to non-structural modifications such as fillets and splitters, floor cones, curtain walls, baffling, and other similar devices that will not impact the overall size and shape of the intakes. Witness Test Following modification testing, a one- day witness test (in-person or virtual) can be held at CEH facility to demonstrate the models with and without the proposed modifications. Preliminary modification drawings will be available at the witness test. City staff are encouraged to attend this test. Travel costs to observe the test in- person are not included. Documentation Tests Following the witness test, it is anticipated that up to 12 documentation tests will be conducted to document the performance of the pump intake with the recommended modifications in place. The cost of evaluating the performance of the intake with the proposed modifications is included. Deliverables for task 3: System Recommendations Technical Memorandum (PDF), and Physical Modeling Documentation (various PDFs and Video). TASK 4: ALTERNATIVES ANALYSIS AND BASIS OF DESIGN REPORT Subtask 4.1 – Preliminary Pump Design Consultant will prepare sizing calculations to develop preliminary wet well size and depth, preliminary pump selection, and preliminary discharge vault sizing. Based on information available, Consultant anticipates that the new pump station will have a design flow rate of 140 cfs with two duty pumps operating, and up to 210 cfs with the third pump operating, and an additional 30 cfs low-flow pump that may operate in smaller storms and to draw down the wet well following larger storm events. The pumps are anticipated to be vertical- axial propeller pumps with zinc anodes. The wet well is anticipated to be a rectangular, cast-in place wet well. Consultant assumes each pump will have individual discharge connections to the discharge vault as well as an emergency gravity bypass. Within the discharge vault, Consultant anticipates each discharge pipe, and the gravity bypass will have a flap gate to prevent ATTY/AGR.2023.241/BKF Engineers (Price Tract Pump Station Design) (Page 18 of 54)