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Wastewater SST Projects

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Wastewater SST Project Updates are included in the Monthly Board Meeting Utilities Report.
Updated 10/28/2024

ECM-1 Influent Flow Equalization

  • Piping supports and spot repairs to the tank must be performed before exterior coating.
  • Established a bypass route for flow during installation

ECM-2 Influent Lift Station Modifications

  • Requested that the baffle be removed from ECM and that the remaining budget be applied to Lift Station B4. 

ECM-3 Modified Ludzak-Ettinger Process Upgrade

  • Solidify one-train operation procedures for design configuration.
  • Baffle, fine-bubble diffusers, and MLE blower submitted and approved.
  • Dissolved oxygen (DO) and oxidation-reduction potential (ORP) probes submitted.
  • Received and reviewed MLE-blower process control description.
  • Received and reviewed recirculation pump control description.

ECM 4 – Blower System Improvements

Blower submittal has been approved.

  • Reviewed process instrumentation (including air flow meters and dissolved oxygen probes).
  • SST project can afford only one blower sized for the aeration basins. Develop a procedure to run back-up blowers upon primary blower failure.

ECM-5 RAS and WAS Pumping Improvements

  • Assess visible surfaces within scum pit and RAS wet well. 
  • Develop description of RAS pumps, WAS control valve, flow meters, process instrumentation, piping, valves, scum troughs, and scum pumps. 

ECM-7 & ECM-8 Electrical Upgrades and Backup Power

  • Main plant generator submittal approved.
  • Meter section has been approved by PG&E.
  • Developing procedure for installing new electrical distribution while providing alternate power sources for running plant.

ECM-9 SCADA System

  • Develop preliminary process and instrumentation diagrams for coordination with SCADA design
  • Develop scope of work for all necessary SCADA upgrades

ECM-12 Sewer Lift Stations (B1 and B4)

  • Develop design flows for each lift station based on available plant records, review of upstream land uses, and estimated peaking factors
  • Confirm design criteria (flow and head requirements) for submersible pumps at each station
  • Confirm size (depth and operating ranges) for wet well
  • Evaluate dimensions and visible condition of existing wet well to determine if it can be used or a new wet well should be constructed
  • Develop preliminary layout of B1 and B4 for review by District staff
  • Develop description of new pumps, valves, access hatches, instrumentation, and appurtenances
  • Develop scope of work and 30% design to integrate lift stations into existing SCADA system
  • Conduct Feasibility Assessment for four (4) additional Lift Stations
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