Design-Builder Firm Name: Walsh Construction Co. II, LLC.Project Overview:The Recycled Water Systems Project will design and construct an Advanced Water Treatment Plant (AWTP) to meet Title 22 requirements for recycled water and remove per-and polyfluoroalkyl substances (PFAS) from the effluent. The project will also design and construct a 250,000-gallon storage tank, pump station, and distribution system of roughly three miles of pipeline and connections to some of the Airport's facilities. The project will also include upgrades to three existing Sequence Batch Reactors (SBR) and the construction of one new SBR for permit compliance.This is a Progressive Design-Build Project where Trade Work is incrementally authorized by Airport. The goal of this project is to design, construct, permit, activate, commission, and closeout of the new construction for the Recycled Water System Project.The new AWTP and SBR upgrade will exist in the current Mel Leong Treatment Plant (MLTP). The MLTP includes parallel treatment processes for wastewater produced from Airport facilities. The Industrial Wastewater Treatment Plant (IWTP) treats industrial wastewater and first-flush storm water runoff; and the Sanitary Wastewater Treatment Plant (SWTP) treats sanitary sewer flows.Trade Package No.: TP-4004Trade Package Title: Structural Steel, Canopy-AC, Misc. MetalsDescription of the Trade Package Scope of Work:Subcontractor shall provide all labor, materials, equipment, and supervision necessary to complete this scope of work in accordance with the construction drawings and technical specifications. Structural steel, canopies and miscellaneous metals are applicable to the following structures: Electrical & Control Building (912), Process Building (914), Blower Building, Sequencing Batch Reactor #4, and Combined Effluent Pump Station.Structural steel includes, but not limited to, roof I beams, steel decking, metal framing, external pipe support frame (west side of Process Building), frame for the air compressor canopy, and roof HVAC unit bracing.Canopies framing includes awnings above entrance doors, connection between Process and Control & Electrical Building, and wrap-around canopy for Blower Building.Miscellaneous metals include but not limited to, furnish and install of CAL OSHA compliant ladders, landings, covers for roof access, metal grating for trenches including rebate embeds, metal stairs, railing, and stair nosing.Blower Building structure design is at 50% at time of bid. Bidder shall assume W16x31 roof trusses in drawing S2.61.03; metal deck, support angles, canopy framing, and all other details are assumed to match those of the Process and Control buildings. There are specific bid assumptions at the Blower Building stated within the scope part of this document. When Final Design results in a material difference from bid drawings and bid assumptions, the change(s) will be address via a future Change Order(s).When final design becomes available for Blower Building, the selected subcontractor may pursue a Reconciliation Change Order based on changes between the final drawings and the assumptions used for bid.BASE SCOPETransportation and Handling• Subcontractor is responsible for the delivery, storage and handling of structural steel material free from mill scale, rust and pitting.• Subcontractor is responsible for the intactness of the coating until steel is erected. Repair if damaged.Fabrication and Installation•Structural Steel and Components:▪Bidder shall include galvanization as specified for structural steel materials. For portions that are intentionally left ungalvanized for welding purposes, shall be field galvanized as approved by the Engineer. Galvanization repair is included in subcontractor scope.▪Subcontractor shall provide all embeds and anchor bolts necessary to install structural steel systems including canopy bracing. Installation shall include HSS posts, welded and bolted beam connections, and metal deck for the roof system. Furnish steel finishes appropriate for water treatment plant environment.▪Furnish and install structural steel beams.▪Furnish and install structural steel columns.▪Furnish and install structural steel girders. Bidder includes fabrication and installation of base plates and anchors of girder-CMU connections per detail 4/S8.12.▪At the Blower Building, bidder shall assume W16x31 roof trusses in drawing S2.61.03▪Furnish and install steel connections and bolts.▪Furnish and install gusset screws and plates.▪Touch-up galvanizing onsite after lifting-aids are removed if necessary.▪Furnish and install metal track blocking.▪Furnish and install headed-embeds over intermediate CMU wall per detail 9/S8.12.▪Furnish and install HSS behind storefront connecting to the CMU wall. Coordinate with masons.▪Furnish and install all embeds and anchor bolts for structural steel systems.▪Furnish connection bolts and anchor bolts.▪Furnish and install Adhesive Bonding Reinforcing Bars and All Thread Rods in Masonry reference specification section 04 05 18▪For Mechanical Anchoring and Fastening to Concrete and Masonry reference specification section 05 05 24•Steel Decking:▪Furnish and install steel decking.•Subcontractor to cut penetration openings in steel decking.•Furnish and install roof deck support angles for penetrations that can be reasonably inferred from other discipline drawings•Lap welding for all decks▪Install penetrations in B decking▪Furnish and install structural steel members for roof and decking system. Include ledger angles.▪Furnish and install steel deck, including cutting, shaping, fitting, drilling, welding, ridge plates, valley plates, reinforcing plates for openings, and miscellaneous pieces necessary for proper installation. Refer to 2/S2.40.05 and 2/S2.40.06 for deck types of Building 912 and 914.▪All steel decking shall receive a protective zinc coating. Refer to drawings and specifications for requirements. Any damaged coating shall be repaired in the field per approved procedure, at no additional cost to the General Contractor and SFO.•Structural HVAC roof curb:▪Furnish and install supporting steel members for HVAC roof top unit curbs.•Stairs and Railing:▪Furnish and install all aluminum stairs and stair nosing’s per specification 05.50.00.▪Furnish and install all grating for stair treads.▪Furnish and install railings per specification 05 52 13-2.01B2- Pipe and Tub Railings.•For AWTP see detail 7/C8.60.02 on the project, including post pockets. Railings must be provided with engineered shop drawings. See drawing A4.01.•For SBR and Sludge Buffer Tanks, assume future safety railings over the structure. Assume a total of 1090 LF of railing on both sides of the walkway. Assume base plate and surface mount anchor.•For Blower Building see page A4.61.01 for railing. See detail 7/C8.60.02.•Stand Alone Canopy:▪Furnish and install canopy including all columns, beams, steel decking, anchor bolts, and cross bracing▪Subcontractor responsible for field verification of anchor bolts layout. Installation of anchor bolts by others.•Building Entrance Door Canopies:▪Furnish and install all headed stud connections per specifications and drawings.▪Furnish and install canopy and awnings above doors and entrances.▪Furnish and install supporting steel angles for canopies.▪Furnish and install HSS supporting member for canopy.▪Furnish and weld the canopy I beam to base plates on the exterior of CMU wall. Refer to Detail 3/ S8.13.▪At the Blower Building, bidder shall include canopy and awnings shown in profile view on drawing A7.61.01 in design package 7 drawings, and on plan view on drawing S2.61.03.▪At the Blower Building, bidder shall assume diagonal kickers connecting to the CMU will be the same as HSS connections, in drawing A8.61.04 Detail 3. Connections between canopy and CMU building will match those of the Process and Control buildings. See details 2/S8.13 and 3/S8.13 based on canopy width.•Miscellaneous Metals:▪Furnish and install all miscellaneous galvanized steel per specifications and drawings▪Furnish and install metal grating▪Furnish and install preformed channel pipe supports.▪Furnish all embedded angle, frames and accessories for metal grating, and hatches.▪Furnish and install galvanized pipe support framing structure on the west side of the processes building for pipe coming out of pipe trench. See drawing S3.40.07▪Furnish and install all exterior roof access ladders and guards with coating as indicated in the specifications.▪Furnish and install hose racks in locations shown on the drawings.▪Furnish and Install Cast iron stop plank grooves and trench drains.▪Furnish and install steel plate rated for 1 hour roof wall.▪Furnish galvanized A53 Grade B steel bollards▪Subcontract is responsible for all F1554 threaded rods and wedge anchors post install including epoxy, for ledger angles, ladders, canopy kicker, and any other structural metal attached to CMU.▪At the Blower Building, bidder shall include 1EA future exterior roof access ladders that is similar to the Process and Control buildings.QC/Inspections•Perform welding for structural metals in accordance with spec 05 12 00•Coordinate with Walsh for any 3rd party inspections including but not limited to welding, high strength bolt testing,•Provide welding procedure specifications (WPS) in accordance with AWS D1.1, D1.4, and D1.6 for yard fabrication and jobsite field welding. Provide welder qualification certificates.Trade Package Bid Due Date and Time: 8/18/2025Main Trades of the Trade Package: Iron workersSBE Participation Requirement: 1.7%Design-Builder requirements or prequalification criteria: Only pre-qualified bidders will be allowed to submit bids. If you did not previously pre-qualify during the pre-qualification timeframe, you will not be able to bid on this project.Contact for Trade Package information: Dominic C Fung,
contact@example.gov web link to the Trade Package or more information: Please contact the email above if you were previously pre-qualified with Walsh and are interested in bidding for this trade package. Walsh will share the bid documents to pre-qualified subcontractors via email and/or BuildingConnected upon request.
