Cooling Tower Replacement

The contract is anticipated to involve the following work to be done at the federal building at 300 N. Los Angeles St., Los Angeles, CA: The overall strategic project goal of the Design-Build (DB) Contractor is for the replacement of (4) 2 Cell Cooling Towers and to perform structural sub-platform and main platform repairs and/or replacement within an occupied building without disruption to occupants and to utilize sustainable design and construction strategies where applicable and practical.

Phase 1 Cooling Tower 1 and/or 2: 

• Using the government provided Pre-Alteration Survey, provide an abatement work plan for review and approval and perform hazmat abatement work according to the findings and the approved plan. 
• Furnish and set-up (1) 500 Ton temporary skid mounted Cooling Tower adjacent to the building on Los Angeles St. within a lockable chain link fence enclosure affording adequate NEC and service clearances, and pipe temporary bypass CWS/R lines to POCs in the basement. 
• Provide temporary make-up water (MUW) and drain down piping indirectly to the nearest approved sanitary sewer. 
• Provide temporary electrical power via a 200 KVA skid mounted genset and electrical disconnect and service power to the skid mounted Cooling Tower. 
• Provide biocidal and other chemical treatment as needed for a temporary cooling tower. Obtain necessary permits and special inspections if/as required from the City of Los Angeles Public Works. 
• Disconnect controls from CT-1 and/or 2, demolish condensate drain, make-up water lines and electrical service back to the distribution panel. Partially demolish Condenser water supply and return lines. 
• Using a helicopter crane or other crane, demolish and remove CT-1 and/or 2 and remove from site to contractor chosen location for recycling and disposal. 
• Demolish and replace CT-1 and/or 2 structural subframe(s). Fabricate off-site or assemble on site, replacement subframe support steel frames, prep and apply corrosion resistant paint or apply elastomeric coating with minimum 10-year warranty. 
• Replace excessively corroded members, or repair CT main structural framing, removing all existing finish down to bare metal. 
• Prepare and apply corrosion resistant paint or apply elastomeric coating with minimum 10-year warranty. 
• Verify or correct capacity of existing mainframe and supporting roof beams, for gravity and lateral loads relative to weight of new CT's and axillary equipment. 
• Provide special inspections of Class 1 weld fit-up and testing and AWS inspection of the welded connections and inspect existing bolted connections to ensure soundness.  
• Evaluate structural capacity and attachments of catwalks and pipe support for possible reuse.  
• Install engineered vibration isolators and seismic bracing for CT-1 and/or 2 and lift and install new CT(s) directly onto sub-framing. 
• Repair pitch pockets and roofing as required in the work area. 
• Provide new power from distribution panel to new electrical disconnect and whip and connect to tower(s) and CW pump(s). 
• Install new MUW lines and drain down lines and route to existing indirect sanitary roof drain for each tower. 
• Reconnect BAS controls, functional test and Cx controls for pumps, CT(s) and BAS via endpoint-to-endpoint testing and verification. 

Phase 2 Cooling Tower 3 and/or 4: 

• Replace the (2) existing nominal 900-ton Cooling Towers (CTs) in one or two phases of construction. 
• Using the government provided Pre-Alteration Survey, provide an abatement work plan for review and approval and perform hazmat abatement work according to the findings and the approved plan. 
• Disconnect controls from CT-3 and/or -4, demolish condensate drain, make-up water lines and electrical service back to the distribution panel. 
• Partially demolish Condenser water supply and return lines. 
• Using a helicopter crane or other crane, demolish and remove CT-3 and/or -4 and their respective CW pumps and remove from site to contractor chosen location for recycling and disposal. 
• Demolish and replace CT-3 and/or -4 structural subframe(s). 
• Fabricate off-site or assemble on site, replacement subframe support steel frames, prep and apply corrosion resistant paint or apply elastomeric coating with minimum 10-year warranty. 
• Replace excessively corroded members, or repair CT main structural framing, removing all existing finish down to bare metal. 
• Prepare and apply corrosion resistant paint or an elastomeric coating with minimum 10-year warranty. 
• Verify or correct capacity of existing mainframe and supporting roof beams, for gravity and lateral loads relative to weight of new CT's and axillary equipment. 
• Provide special inspections of Class 1 weld fit-up and testing and AWS inspection of the welded connections and inspect existing bolted connections to ensure soundness. 
• Evaluate structural capacity and attachments of catwalks and pipe support for possible reuse. 
• Install engineered vibration isolators and seismic bracing for CT-3 and/or -4 and lift and install new CT(s) directly onto sub-framing. 
• Repair pitch pockets and roofing as required in the work area. 
• Provide new power from distribution panel to new electrical disconnect and whip and connect to tower(s) and CW pump(s). 
• Install new MUW lines and drain down lines and route to existing indirect sanitary roof drain for each tower. 
• Reconnect BAS controls, functional test and Cx controls for pumps, CT(s) and BAS via endpoint-to- endpoint testing and verification. (Note: There is no BAS programming nor graphics scope) 

The anticipated magnitude of the contract is $5M to $10M. A full and open request for proposal is anticipated to be published late February or early March 2023.