Date: 2025 09-September 11

1980

• System:
  • Admin building upgrade
  • Control system changed to a mini computer system
• Components:
  • Fischer & Porter
• The system was obsolete by 1983 because it ran on mini computers
• This was all ripped out in 1995
• There was a negative experience with tuning aeration based on DO levels, the ideal set points were never achieved.
• No one ever tuned the system.
• Maxson abandoned a control mindset.

1995

• Westinghouse Implementation
• New backup panel
• New IO

1998

• Westinghouse was bought out by Emerson

2000

• System: Lagoon covers 2A, 2B, 2C
• Construction: Chris Hill
• Engineering: Black & Veatch
• 175 tags
  • Condensate level, fan stopping, fan running, etc

2011

• Westinghouse card system was changed over to Ovation
• Same backup panel
• Same IO
• New Ovation modules

2013

• System: BioRem
• Primary Contractor: Kiewit

2014-2017

• CSI components Blower control room (never finished)

2017-2026

• Primary contractor: CDM Smith
• Broke ground for in 2017
• Systems
  • Disinfection
  • Trickling filters
  • Reaeration blowers and basins
  • Lagoon 2A
  • Aeration monitoring with dissolved oxygen probes
  • Bio Air odor control

2023-2024

• Project: Evergreen Upgrade, New Admin building
• Primary Contractor: Emerson
• Electrical subcontractor from St Louis

2025

• Construction: Chris Hill
• Engineering: Black and Veatch
• Primary Clarifiers

Going forward

• Machine health equipment, purchasing