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FLOW BYPASS SYSTEMS 02 7400-1 <br />SECTION 02 7400 <br />FLOW BYPASS SYSTEMS <br />PART 1 – GENERAL <br />A. Temporary bypass pumping may be necessary for the rehabilitation of existing pipeline, <br />installation of new service laterals, installation and rehabilitation of manholes and pipeline <br />point repairs. The Contractor shall conduct the flow bypass system in accordance with the <br />specified requirements as stated herein. <br />B. Contractor shall determine where bypass pumping is required. As an alternative to bypass <br />pumping, flow control methods may be used if the upstream system has adequate storage <br />capacity, and is approved by the Engineer 24 hours in advance of the Work. <br />C. Under no circumstances will dumping of raw sewage be allowed on private property or <br />public rights-of-way. <br />D. Remove bypass pumping and/or flow control after work is completed. <br />1.01 SYSTEM DESCRIPTION <br />A. Performance Requirements: <br />1. It is essential to the operation of the existing sanitary sewer or storm drain system that <br />there will be no interruption in the flow throughout the duration of the Project. Provide, <br />maintain, and operate all temporary facilities such as dams, plugs, flow-through plugs, <br />pumping equipment (both primary and backup units), conduits, and all necessary <br />power to intercept the flow before it reaches the point where it would interfere with the <br />Work, carry it past the Work, and return it to the existing pipeline downstream of the <br />Work. <br />2. Design, install, and operate the temporary pumping systems. <br />3. Convey the influent flow safely past this Work area. Do not stop or impede the main <br />flows under any circumstances. <br />4. Maintain flow around the Work area in a manner that will not cause surcharging of <br />sewers or storm, damage to sewers or storm, and that will protect public and private <br />property from damage and flooding, including the routing of overflow in the event of <br />failure of any bypass system. <br />5. Protect water resources, wetlands, and other natural resources. <br />B. Design Requirements: <br />1. Provide flow-through plugs, pumps of adequate size to handle peak flow as defined <br />below and temporary discharge piping, to ensure that the total flow of the utility pipeline <br />and service connections can be safely diverted around the section to be replaced. <br />2. The pumping system shall be of sufficient capacity to handle existing flow plus <br />additional flow as calculated by the CONTRACTOR and approved by the CITY or as