CIP 22-P010/CIP 22-R014 - WWTP HVAC Replacements (CIP 22-P010) and DERWA HVAC Replacements (CIP 22-R014)

Overview:

1. Building A
   1. Replacement and modification of rooftop HVAC equipment serving all of the 2nd floor laboratory and office spaces. Rooftop equipment to be demolished shall include existing EFs 1 thru 9, general exhaust fan, GE-1, AHU-1, air cooled chiller CH-1, associated pumps P-1, 2, and all CHW & HHW piping and appurtenances associated with AHU-1 and CH-1 on rooftop. Demolish rectangular supply air ductwork from AHU-1 on roof down to where the ductwork transitions to round duct branches serving the 2nd floor spaces. Demolish the existing absorption chiller and associated pumps, piping and accessories on grade. Chilled water piping from the absorption chiller shall be demolished to point of disconnect on lower roof as shown on drawings. Heating hot water piping from the absorption chiller shall be demolished and capped as shown on drawings.
   2. Provide new major HVAC equipment including: AHU-1, CH-1 & 2 & associated inline primary CHW pumps, secondary CHW pumps, strobic exhaust fan system. AHU-1 shall be provided with new double wall supply air duct down to point of connection to existing round supply air duct above the 2nd floor ceiling. New Chillers, CH-1 & 2 and all associated pumps and accessories, shall be provided in place of the demolished absorption chiller on grade.
   3. Replacement of 2nd floor chemical fume hoods FH-1, 2, 3, 4, 6, and 11. Existing process piping shall be demolished back existing SOVs behind existing fume hoods. Existing acid waste pipe shall be demolished from cup sink back to point of disconnect at wall behind existing hoods.
   4. Provide new chemical fume hoods FH-1, 2, 3, 4, 6, and 11. Fume hoods 1, 2, 3, 4, and 6 shall be provided with manufacturer's corrosive and flammable storage cabinets as shown on drawings. FH-11 shall be provided on the existing lab countertop with all necessary manufacturer accessories such that FH-11 will be installed without airflow leakage. All fume hoods shall come pre-piped to accept connections to site process piping at point of connection shown on drawings. New shut off valves shall be provided at all locations of reconnection to existing process piping; except for natural gas which shall be provided only with new SOV and capped behind the fume hoods. Fume hoods shall not be pre-piped to accept natural gas. Fume hoods be provided with cupsinks and shall reconnect to existing acid waste piping points of connection.at locations specified on drawings.
   5. All existing Phoenix valves serving the 2nd floor shall be retain valve bodies but shall be retrofitted to remove the <E> pneumatic controls and be provided with new electronic Siemens controls and integrated into the existing building A Siemens controls system.
   6. New Siemens exhaust valves shall be provided to serve the 2nd floor rooms and/or hoods & equipment that currently do not have an exhaust valve installed within the exhaust ductwork. New valves shall be installed per the drawings and shall be integrated into the building's Siemens controls system.
   7. Replacement of 1st floor Titus VAV boxes. New VAV boxes provided will be like-for-like replacements with reheat coils. Reheat coils shall reconnect to existing HHW piping. New VAV boxes shall be provided with new digital controls and shall be integrated into the existing building Siemens controls system.

2. Building T:
   1. The existing absorption chiller and associated CHW and HHW pumps shall be demolished and a new equivalent capacity absorption chiller and pumps will be provided in their place. The existing concrete housekeeping pad shall be extended such that the installation of the new chiller can allow adequate spacing for piping connections and routing between the new chiller and the exterior wall of building T. The new absorption chiller will be provided without the manufacturer's sheet metal casing. The absorption chiller will be provided with an outdoor overhang similar to the adjacent one currently protecting the existing pumps and piping.

3. Buildings M & O:
   1. The existing rooftop package units on the roofs of buildings M & O shall be demolished and replaced with owner-furnished replacements in the same locations as existing.

4. Building C:
   1. Existing rooftop package unit shall be demolished and replaced with a like-for-like replacement in the same location as the existing unit.

5. Building H:
   1. Existing AHU-2210 and associated heating hot water piping shall be demolished. A new equivalently sized air handler shall be provided in it's place and connected to the existing ductwork. The heating hot water will not be reconnected and shall be capped as shown on drawings.
   2. Existing EF within influent pump room shall be demolished and a new section of duct will be installed to replace the demolished EF.