Renovation of a municipal facility in Rochester, Minnesota. Completed plans call for the renovation of a municipal facility.

This project is to repair and/or replace leaking and/or damaged roof membrane material located at the Olmsted Waste to Energy Facility (OWEF) in Rochester, Minnesota. Question Deadline: 4/19/2023 10:00 AM (CT) 1.1 This project is to repair and/or replace leaking and/or damaged roof membrane material located at the Olmsted Waste to Energy Facility (OWEF) in Rochester, Minnesota. 1.2 The OWEF is a waste-fired cogeneration power plant located in Rochester, Minnesota that is owned and operated by Olmsted County. The OWEF provides heating, cooling, electric power, and other utility services to a number of local buildings. The primary fuel for the OWEF is Municipal Solid Waste (MSW), with natural gas and light fuel oil serving as backup fuels. 1.3 The OWEF consists of two (2) 100 ton-per-day and one (1) 200 ton-per-day MSW combustor boiler units of the mass-burn water-cooled wall design, three (3) steam turbine-generators, MSW receiving facility, ash handling systems, air pollution control equipment, necessary auxiliary installations, medium voltage equipment necessary to connect with the utility grid, and a natural gas fired backup boiler. 1.4 The two (2) 100 ton-per-day Riley/Takuma waste combustor boiler units, Unit 1 and Unit 2, were commissioned in 1987. Unit 1 and Unit 2 are of the stoker fired, watercooled wall, excess air type. Unit 1 and Unit 2 supply about 25-30 kpph of live steam each, at 610 psig, 610-6500 F. The one (1) 200 ton-per-day AEEVR/ Duro Dakovich waste combustor boiler unit, Unit 3, was commissioned in 2010. Unit 3 is a stoker fired, water-cooled wall, excess air type. Unit 3 supplies 57-63 kpph of live steam, at 610 psig, 610-6500 F. The 75 kpph dual fuel Nebraska packaged boiler unit provides backup steam at 250 psig saturated conditions for use during the waste combustor boiler shutdowns. 1.5 Electrical power is generated with one (1) backpressure steam turbine generator unit of 1.86-MW nominal capacity (TG1), one (1) condensing steam turbine generator unit of 2.22-MW nominal capacity (TG2), and one (1) condensing/extraction steam turbine generator unit of 5.4-MW nominal capacity (TG3). TG1 and/or TG3 supply steam to a 60 psig header used primarily for the OWEF district energy system; TG2 exhausts into air cooled condenser 1; and TG3 exhausts into air cooled condenser 2. Steam from the 600 psig header is also cascaded to supply 250 psig steam headers through pressure reducing and desuperheating stations. 1.6 The facility operates continuously twenty-four (24) hours per day, seven (7) days per week, fifty-two (52) weeks every year. The planned operating schedule of each boiler allows for normal planned maintenance to be accomplished without interrupting the supply of steam or electricity. There are currently three (3) scheduled maintenance shutdowns per year for Unit 1 and Unit 2 each and two (2) scheduled maintenance shutdowns per year for Unit 3. Outage durations vary depending on the time of year, but normally requires about two (2) weeks for Unit 1 or Unit 2 and four (4) weeks for Unit 3. Outages typically do not occur simultaneously. 1.7 This project shall have all work specified below performed as a turnkey service, unless indicated otherwise in this specification. The contractor shall supply all supervision, labor, and tools for all work conducted onsite. 4.1 Nebraska Boiler Roof - outdoor only, southwest side of plant near tipping floor access. 4.1.1 Tear off existing roofing material down to metal decking (substrate to include fasteners, fiber board, insulation, etc.). Remove any coverings/caps on barrier walls. 4.1.2 Replace substrate (see 4.1.1), keeping in mind adequate water shedding towards scupper. Pooling of water on any joint, corner, seam, etc., is considered unacceptable. 4.1.3 Replace EPDM rubber glue down membrane with equivalent or improved material, sealing all seams, edges and corners. 4.1.4 Seal membrane to scupper transitional area. 4.1.5 Install roofing membrane far enough up under existing wall steel to prevent "capillary action". This is when the water will flow back under the steel and possibly onto the wall above roofing membrane. This is on the north and east sides of the roof. 4.1.6 Reinforce the area's along upper level building walls, to prevent puncturing of membrane from ice falling off upper level roof's. 4.1.7 Replace blocking for exhaust roof unit and seal water tight to roofing membrane. 4.1.8 Reinforce/protect roof membrane under roof AC unit. 4.1.9 Any replaced steel that will be exposed, is to match existing color/profile 4.1.10 Can gain access to roof from stairwell to west by use of ladder. 4.1.11 Area of roof is roughly 1,200 sq. ft 4.2 Turbine Hall Roof - east side of building next to office area 4.2.1 Patch/seal leak in southwest corner where steel roof meets the flat roof (area above electrical panels covered in plastic), extending 8' radius in each direction from the two southwest corners. 4.2.2 Water leaks down west wall between southwestern most inside corner joint and outside corner joint. 4.2.3 Flash/seal steel directly above roof membrane on west walls near corners. 4.2.4 Roof appears to be a mixture of asphalt (tar) and rubber with a layer of small river rock that may need to be cleared for sealing. 4.2.5 Can gain access to roof through condenser 1 structure, 1050 level. 4.3 QR/Lime Silo Roof - West of plant 4.3.1 Patch/seal leak near drain southwest of QR 2. 4.3.2 Roof is Rubber EPDM, with light layer of large river rock covering. 4.3.3 River rock is loosely laid and will need to be moved/swept away to determine leaky area. 4.3.4 Can gain access to roof through door on 1078 level inside facility. 4.3.5 Based on leak residue of showing on steel decking, check up to 10' in all directions around drain to find leak. 4.4 Ash Room Roof - North of Turbine Hall roof, west of condenser structure 4.4.1 Patch/seal leak in corner along south wall 4.4.2 Roof is rubber EPDM, with light layer of large river rock covering. 4.4.3 River rock is loosely laid and will need to be moved/swept away to determine leaky area. 4.4.4 Can gain access to roof through turbine hall and condenser 1 structure, level 1040. 4.4.5 Look up to 8' in all directions from corner to determine leak. 4.5 The Contractor will be responsible for transporting and unloading materials to desired locations that will not hinder operations of OWEF