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Docusign Envelope ID: DA4FA5BF-D9AF-4543-AD49-B8F98E2726F6 <br /> Appendix A—Basis of Design <br /> Currently the City has no preference on manufacturers for influent lift station components. <br /> 3.2.2 Wet Well Design <br /> The DB will consider and propose wet well design alternatives that are sized for anticipated final <br /> phase treatment capacity of 8.0 MGD. <br /> 3.2.3 Pump Systems <br /> The design for pumping systems assumes a need to consistently deliver flow equal to at least the <br /> permitted flow times a peaking factor of 3.2.The peaking factor of 3.2 is consistent with the City's <br /> wastewater master plan. <br /> 3.2.4 Odor Control <br /> The DB will consider alternatives for controlling odor from the lift station.The City has a preference <br /> for biological odor control processes,but is willing to consider other processes that can provide the <br /> best value for the City. <br /> 3.3 Preliminary Treatment <br /> 3.3.1 General <br /> The DB will consider and propose design alternatives for sizing of the headworks to accommodate <br /> initial through ultimate design flows. <br /> The DB will consider design alternatives without screens prior to the on-site influent lift station, <br /> innovative geometric configurations and design features,and a process that allows for continuous <br /> operation of the headworks while conducting maintenance and repairs. <br /> The DB will consider and propose design alternatives for controlling odor at the headworks and <br /> primary clarifiers if included in the design. <br /> 3.3.2 Bar Screens <br /> The DB shall consider bar screens design alternatives that include manual screening,bypass channel <br /> functionality,and other components to allow for minimal maintenance and operational needs. <br /> 3.3.3 Grit Removal <br /> The DB shall consider grit chambers with spray washers to be included in the design. <br /> 3.3.4 Primary Clarifiers <br /> The DB will consider the inclusion of primary clarifiers in the design as maximum contaminant levels <br /> for total phosphorus are anticipated to be required in the TPDES permit for the proposed treatment <br /> facility.The DB may propose other treatment processes such as anaerobic digestion for consideration <br /> by the City. <br /> 3.4 Secondary Treatment <br /> 3.4.11 General <br /> 4-2 <br /> ARDURRA <br />