Item 07 - Sewer System Management Plan 2025 Update

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CITY OF SANTA ANA APPENDIX I PROJECT NO.: XX-XXXX PROJECT TITLE The pipe and fittings shall be lowered into the trench. Do not throw the pipe or fittings into the trench. If it is determined that bypassing of sewer flow will be required, the bypass pumping system shall have sufficient capacity to pump the peak flow. Sewer bypassing shall conform to Section 6-21 of these Special Provisions. The Contractor shall provide bypass piping for the effluent during the construction of the sewer main between manholes. The inlet of the downstream manhole and the outlet of the upstream manhole shall be plugged. A portable pump shall be installed in the upstream manhole to discharge the effluent from the upstream manhole to the downstream manhole through the bypass piping. Pump and bypass piping shall be of adequate size and capacity to handle the flow without sewage backup occurring to facilities connected to the sewer. For sewers 12-inches in diameter and larger, or where deemed necessary by the City, the following shall apply: All pumps used shall be fully automatic self -priming units. All pumps used must be constructed to allow dry running for long periods of time to accommodate the cyclical nature of effluent flows. The Contractor shall provide the necessary stop/start controls for each pump. The Contractor shall have adequate standby equipment available and ready for immediate operation and use in the event of an emergency or breakdown. One standby pump for each size pump utilized shall be installed at the mainline flow bypassing locations, ready for use in the event of primary pump failure. The Contractor shall continually monitor all pumping equipment. The Contractor shall perform leakage and pressure tests of the bypass pumping discharge piping suing clean water prior to the actual operation. The Water Resources Division shall be given 24 hours notice prior to testing. The Contractor shall be required to flow monitor for a two week period to assist in sizing the pumps necessary for the sewer work and shall be considered included as part of the work. The Contractor shall prepare, with the vendor, a flow monitoring map for key manholes that will provide adequate data for the work subject to review and approval from the Water Resources Division. Flow monitoring shall capture accurate instantaneous depth, velocity and flow data in 15-minute increments or less, or as otherwise approved by the Water Resources Division. The Contractor shall prepare with the vendor a specific, detailed description of the proposed pumping system and submit it and the vendor's references to the City. The Contractor shall submit to the City detailed descriptions outlining all provisions and precautions to be taken by the Contractor regarding handling of existing sewage flows. The submittal must be specific and complete, including such items as schedules, capacities of equipment, materials, and all other incidental protection of the access and bypass pumping locations from damage due to the discharge flows. The submittal shall include but not be limited to the following: 1. Sewer plugging method and types of plug.