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ORANGE COUNTY BOARD OF COMMISSIONERS ACTION AGENDA ITEM ABSTRACT Meeting Date: June 27, 2006 Action Agenda Item No. ,~j- 5 SUBJECT: HVAC System Replacement at EMS 911 Center DEPARTMENT: Public Works, Purchasing PUBLIC HEARING: (Y/N) No ATTACHMENT(S): Bid Tabulation INFORMATION CONTACT: Pam Jones, 245-2652 Wilbert McAdoo, 245-2625 Wayne Fenton, 245-2628 PURPOSE: To award a bid and authorize a contract for replacement of the heating, ventilation and air conditioning (HVAC) system in the basement level of the Orange County EMS 911 Center. BACKGROUND: The Orange County EMS 911 Center on New Hope Church Road was constructed in 1983, with an addition constructed and renovations to finish the existing basement space in 1992. Due to the phased constnaction of the building, there are essentially four individual systems currently serving the building, Although some individual system components have been replaced, approximately half of the equipment and all of the ductwork is original construction. Occupancy and use of the building have changed significantly over time, including higher occupancy levels and the addition of more electronic (heat generating) equipment, especially an the basement level, These factors, combined with modern demands for the introduction of increased outside air, have resulted in the existing HVAC systems no longer being able to adequately meet the needs of the building and occupants. In September 2004, Orange County contracted with Reece, Noland & McElrath for the evaluation of several replacement system options, and recommendation for a replacement system for the EMS 911 Center, The initial report considered four separate systems at an order-of-magnitude level of detail far comparison purposes. The report considered several options, including a geothermal system, Site limitations, including existing trees and other vegetation, proximity to groundwater and existing municipal water supply sources, and the high number of electrical, plumbing and communication lines entering and leaving the building, as well as the substantially additional installation cost, meant that geo-thermal was not a good "fit" for this particular location. As a result, a more conventional system with efficiency enhancements was recommended. Items added to improve the sustainability of the design once the system was selected included: • using the highest efficiency HVAC system components • installation of higher efficiency lighting • installation of occupancy sensors to improve energy efficiency • the addition of a zoning system,