2022-133-E-AMS-Warren Hay Mechanical Contractors-Emergency Services Warehouse Dehumidification

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ORANGE COUNTY 019916 - 3 Emergency Management Warehouse Building Dehumidification Divisions 23 and 26 Work in Existing Buildings GENERAL CONSTRUCTION DEMOLITION 1 2 Demolish and remove existing construction only to the extent required by new construction and as indicated. Use 3 methods required to complete the Work within limitations of governing regulations and as follows: 4 5 Neatly cut openings and holes plumb, square, and true to dimensions required. Use cutting methods least likely to 6 damage construction to remain or adjoining construction. Use hand tools or small power tools designed for sawing or 7 grinding, not hammering and chopping, to minimize disturbance of adjacent surfaces. Temporarily cover openings to 8 remain. 9 10 Cut or drill from the exposed or finished side into concealed surfaces to avoid marring existing finished surfaces. 11 12 Do not use cutting torches until work area is cleared of flammable materials. At concealed spaces, such as duct and 13 pipe interiors, verify condition and contents of hidden space before starting flame-cutting operations. Maintain fire 14 watch and/or portable fire-suppression devices, as required, during flame-cutting operations. 15 16 Maintain adequate ventilation when using cutting torches. 17 18 Remove decayed, vermin-infested, or otherwise dangerous or unsuitable materials and promptly dispose of off-site. 19 20 Remove structural framing members and lower to ground by method suitable to avoid free fall and to prevent ground 21 impact or dust generation. 22 23 Locate selective demolition equipment and remove debris and materials so as not to impose excessive loads on 24 supporting walls, floors, or framing. 25 26 Dispose of demolished items and materials promptly. 27 28 Protect construction indicated to remain against damage and soiling during demolition. 29 30 31 MECHANICAL DEMOLITION 32 33 Remove or relocate all mechanical elements (devices, fixtures, controls, etc.) from walls or floors indicated as being 34 demolished. 35 36 Thermostats and sensors containing mercury shall be disposed in accordance with EPA Resource Conservation and 37 Recovery Act (RCRA). Contractor shall refer to EPA web site for handling procedures for disposal and spill 38 management of projects containing mercury. 39 40 Extend or relocate any existing piping and or ductwork serving existing equipment to remain or other items where 41 such circuits are disrupted due to demolition. 42 Remove all abandoned piping back to the point of supply or back to the point where other remaining piping is 43 connected. For existing piping imbedded existing walls or floors that are not to be demolished, remove piping to 44 behind finish surface, cap, and patch wall or floor as specified hereinafter. 45 46 Existing HVAC systems serving both occupied areas and construction areas shall be modified as required to isolate 47 the construction area. Ducts shall be sealed by closing dampers, disconnecting ducts and sealing openings with 6-48 mil polyvinyl sheeting, etc. 49 50 HVAC equipment in construction areas that is required to be reused shall be de-energized and protected from 51 construction dust and debris with 6-mil polyvinyl sheeting during construction. HVAC systems that are modified 52 during renovation shall be sealed until modifications are made and then resealed until start-up is required. After 53 unsealing of equipment, coils and drain pans of air-handling equipment shall be cleaned. 54 55 Recover and recycle refrigerants from existing equipment to be demolished. All demolition work of existing systems 56 containing refrigerant must be conducted in accordance with Section 608 of EPA Clean Air Act under supervision of 57 an EPA certified technician. Provide documentation with types, quantities and dates for the engineers and owners 58 record. 59 60 DocuSign Envelope ID: 7668B866-6C26-485C-9A45-DAAB5D4BD951