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