Item 07 - Sewer System Management Plan 2025 Update

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CITY OF SANTA ANA APPENDIX I PROJECT NO.: XX-XXXX PROJECT TITLE suction lift sufficient to avoid sewer surcharge. The self -priming system shall allow the pump to start dry and run dry without causing damage. Pumps may be equipped with a vacuum assisted self -priming device. Any orifice designed to discharge air during pump priming shall be connected to a portable activated carbon scrubber. All engines shall be critically silenced for sound control and regardless of noise level, soundproofing shield not less than eight feet high shall be provided around each engine to absorb noise. 100% standby pumping shall be provided. Standby pump shall be sized to match the duty pump. Standby pumping equipment shall be at the site continuously during bypassing to provide standby pumping capacity. Above ground bypass piping shall be high density polyethylene (HDPE) pipe, steel or aluminum pipe with grooved couplings. HDPE shall be butt welded and have a minimum wall thickness of SDR 17. For protection against damage, the bypass piping shall be protected in place by barrier or crash cushions when adjacent to traffic. All temporary connections to existing and new manholes shall be properly covered and sealed to prevent nuisance odors from escaping into the atmosphere. When the bypass piping discharges into a manhole, the discharge pipe shall extend into the manhole, ending at the elevation of the center of the trunk sewer. All valves used on the bypass system shall be open port gate, plug or ball valves. Temporary plugs shall be appropriate for the application. Plugs shall be heavy-duty inflatable type with a steel rod through plug centerline, a retaining plate and an eye -lift on both ends. Plugs shall have a flexible sealing design to compensate for any irregular interior surface of the pipe. Flow -through plugs shall be appropriate for the application and provided with the required configuration to perform the bypass. The flow -through plug shall consist of a flow -through plug and a flexible hose. The flexible hose shall be rubber coated, heavy duty, nylon hose with and enclosed steel helix coil. The flow -through plug shall attach to the flexible hose using high torque, stainless steel pipe clamps. The flow -through plugs shall be equipped with continuous pressure monitoring. The Contractor shall take all necessary precautions, including constant monitoring of bypass pumping to prevent sewage spills due to back-up and/or overflow resulting from breakage or blockage of the bypass system. The Contractor shall provide experienced personnel knowledgeable in the operation of the bypass equipment to monitor each bypass when the bypass is installed and operating. At no time shall the bypass system be left unattended during operation by the designated personnel. The bypass system (all equipment) shall be fully tested prior to commencing bypass operation, including back-up pumps.