Balboa Island/Little Island Pump Station - Odor Control & Grease Cap Treatment - Case Study


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Program Objectives

  1. Reduce Water Usage of Spray System
  2. Eliminate Formation of Grease Cap
  3. Reduce H2S Odors
  4. Prevent Insect Nesting & Reproduction
  5. Reduce Pump Out Requirements
  6. Enhance Sewage Line Maintenance
  7. Reduce Direct & Municipal Costs

Basic Description of Pump Station

  • The pump station, located on the Little Island of Balboa Island, serves as the collection point for all three islands (Little Island, Balboa Island, Collins Island) that comprise the Balboa Island collection system.
  • The pump station is adjacent to the bay front and a public pier (40 ft.) at the end of the main street running directly from the bridge onto the island.
  • Sewage from the pump station is pumped under the bay channel through a forced main and exits into the OCSD trunk line running along Bayside Drive.
  • Sewage flows up to 300,000 gallons daily, with variations due to high visitors during summer months and holidays.

Previous Status of Pump Station Operations & Maintenance

  • Pump Station uses a two-spray bar system that was spraying for 5 minutes during each pump out phase, day and night.
  • Based upon the pumping sequence and spray rate consumption of water, the spray system was using 16,000 gallons of water daily.
  • The spray system was successful in eliminating the nesting and procreation of small flies that had caused community relationship issues.
  • In addition to the spray system, a fan blower evacuates the air within the well continuously, discharging the air up through an adjacent hollow flag pole.
  • Grease cap within the well built up continuously (+/-18”) and was pumped out every 90 days.

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