Calabasas lake aeration system replacement project in the city of calabasas, california

The City of Calabasas is requesting sealed bids on the complete removal and replacement of the aeration system at Calabasas Lake under Specification No. 2026-13, with bids due August 12, 2026 at 2:00 p.m. and questions due August 5, 2026 at 2:00 p.m. Bidders must hold a valid California Class A contractor's license, Type A General Engineering Contractor license, Type C-34 Pipeline Contractor license, or Type C-36 Plumbing Contractor license, with a minimum of five years' experience in work of comparable magnitude and character.

The scope involves removing and disposing of five existing aeration systems installed 36 years ago, each supplying air to eight air stations (bubblers) on the lake bottom. The replacement includes new aeration cabinet air components with dual one-horsepower compressors per vault, aeration vault electrical components, self-sinking tubing lines, air stations with multiple diffuser disks, and removal and replacement of associated concrete walkways. Bidders must independently verify all quantities and provide unit pricing across nine line items plus a city-controlled allowance of $25,000.

The project is a prevailing-wage public work subject to California Labor Code Section 1720 et seq. compliance and monitoring by the California Department of Industrial Relations. The Engineer's Estimate is $325,000. The contractor must commence work within fifteen calendar days of Notice to Proceed and complete all work within 90 working days, with a target completion date of December 28, 2026. A 10 percent bid guarantee is required at bid submission. Performance, payment, and maintenance bonds at 100 percent, 100 percent, and 50 percent of the bid amount respectively must be provided within ten calendar days of award. Comprehensive insurance including general liability ($2 million per occurrence), automobile liability ($2 million combined single limit), workers' compensation, Builder's Risk, and pollution liability ($1 million per claim) is required prior to contract execution. Liquidated damages of $1,000 per working day apply for delays beyond the 90 working day period. City Council approval is scheduled for September 9, 2026, with contract effectiveness September 16, 2026.