Design-Builder Firm Name: Walsh Construction Co. II, LLC.Project Overview:The City and County of San Francisco’s Airport Commission (Airport) owns and operates the 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. This is a Progressive Design-Build Project where Trade Work is incrementally authorized by the Airport. This project is to design, construct, permit, activate, commission, and closeout of a new Recycled Water System, including an Advanced Water Treatment Plant, to meet Title 22 requirements for recycled water and removal of per-and polyfluoroalkyl substances (PFAS).Trade Package No.: 2001Trade Package Title: 2001-Demo & HazmatDescription of the Trade Package Scope of Work:Bid Form Item A.1 MobilizationThe demolition and hazmat subcontractor shall include all costs for mobilizing and demobilizing equipment to perform the demolition and hazmat scopeBid Form Item A.2 Hazmat and AbatementSee attached reference reports for findings and locations of hazardous materials including but not limited to the following:Abatement prior to demolition for existing building components or materials containing asbestos and mercury-containing items.For lead-containing paints and coatings, the loose and peeling paints must be stabilized prior to demolition, and debris segregated from the waste stream and characterized to determine leachability prior to disposal.Assumed PCB-containing ballasts identified in conjunction with fluorescent lighting fixtures to be removed and examined.Bid Form Item A.3 Demo and Removal Building 908 and TrailerRemove and dispose all of building 908 structure, foundations, and underground utilities to the extents shown on the drawings. Trailer adjacent to building 908 to be demolished. Electrical safe-off by others.Bid Form Item A.4 Demo and Removal Building 908 Chemical tanks and Decommissioned IWTPAll known and unknown hazardous waste to be removed, including all chemical tanks and contents and all associated permitting and chemical reports produced by an accredited environmental company per Walsh’s Construction Demolition Debris Management Plan. Please note that not all chemical tanks have been identified. The contents of each tank will be removed by others and the tank neutralized prior to removal of Chemical Tanks. Bid Form Item A.5 Demo and Removal Trickling Filter, Including MediaDemo trickling filter, including media, foundations, and underground utilities. Media to be disposed of in accordance with Walsh’s Construction Demolition Debris Management Plan. Bid Form Item A.6 Demo and Removal Clarifiers and Sludge Pump StationDemo clarifier tanks and pump station including foundations and underground utilities. Bid Form Item A.7 Overall Site Clearing, Grubbing and Asphalt Removal Removal of concrete curb and gutter, sidewalk, landscaping, trees including next to trickling filter and between building 908 and the trailer adjacent to building 908, irrigation systems, along with capping of piping and electrical wiring ends. Finally, asphalt pavement and subgrade will be removed. After removal of all utilities, trenches and excavations to be backfilled and compacted to 95% per specification 01 35 43.01.Saw cutting at demolition limits to adjoining existing asphalt or curb and gutter to provide a clean edge. Bid Form Item A.8 Removal and Disposal of Underground UtilitiesSee drawing reference keynotes on pages D 1.01 through D 1.18 from the “100% Demolition Drawing Set” attached for the following. Note that some existing utilities may not be shown.Removal and disposal of the following various abandoned and existing piping systems:Removal and disposal of 10 drain line piping (Keynote 4), 10 overflow piping (Keynote 5), abandoned industrial waste piping (Keynote 6), the 12 effluent to chlorine contact basin piping (Keynote 7), as well as 4 sludge and scum draw-off piping (Keynote 8&9).Removal and disposal of abandoned trickling filter effluent piping (12, 14, and 18)(Keynote 10), 14 recycle and filter bypass piping (Keynote 11&12), the 8” BAFE line (Keynote 2), and the 14 influent force main (Keynote 13).Removal and disposal of 4 sludge transfer force main (Keynote 14), 3/4 instrument air piping (Keynote 15), 4 sanitary drain line piping (Keynote 16), and existing industrial waste and water lines (Keynotes 17 & 22), 3 and 14 IWFM lines (Keynotes 21 & 23).Removal and disposal of 4” waste sludge force main and 6” drying bed drain line (Keynote 18)Removal and disposal of existing sewer gravity line (Keynote 24)Removal and disposal of existing 12” WW line (Keynote 25) and existing IWST line (Keynote 26) (Currently not shown in drawings).Remove and dispose to the approximate extents shown of the abandoned natural gas line (Keynote 28).Remove abandoned recycled water piping from the abandoned recycled water filtration system. (Keynote 29).Electrical conduits and duct banks to be removed as necessary. Light poles and their foundations to be removed or salvaged along with associated electrical conduits. Bid Form Item A.9 Demo and Removal of Underground Fuel Storage TankRemove and backfill underground 2,000-gallon fuel storage tank, the surrounding structure, and its foundation (see M-12A/D1.12 on 100% Demo Drawings). It is understood that the tank is empty. Contents will disposed of by others.Bid Form Item A.10 Exposing Existing PilesAll existing piles within AWTP boundary to be exposed and removed to a depth of 5 ft below existing grade, except piles under clarifiers. Subcontractor to provide 24 hours for Walsh to perform survey of existing piles after exposing for as-builts.After survey is complete, subcontractor must back-off and safe-off excavationAll existing piles (12) within future trench boundaries to be exposed and removed to a depth of 10ft.See “Bid Form item A.10” document for existing pile locations at future trench.Trade Package Bid Due Date and Time: Tuesday, March 4th, 2025, by 2:00PM (PST)Main Trades of the Trade Package: Demolition and HazmatCMD SBE Participation Requirement: 1.7%Design-Builder requirements or prequalification criteria: Only pre-qualified bidders will be allowed to submit bidsContact for Trade Package information: Dominic C Fung
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