Agenda -11-06-2008 - 4q - Laserfiche WebLink

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ORANGE COUNTY BOARD OF COMMISSIONERS ACTION AGENDA ITEM ABSTRACT Meeting Date: November 6, 2008 Action Agenda Item No. SUBJECT: Amendment to the County Campus Construction Manager at Risk Agreem t to Increase Funding for Enhanced Ener y Use HVAC System DEPARTMENT: Purchasing PUBLIC HEARING: (Y/N) No ATTACHMENT(S): INFORMATION CONTACT: Pam Jones, 919-245-2652 PURPOSE: To consider approving a contract amendment to the Construction Manager at Risk (CMAR) Agreement for the County campus to provide funding for energy use enhancements to the heating, ventilation and air conditioning system (HVAC) in both the office building and library in an amount not-to-exceed $445,569. BACKGROUND: The Board of Commissioners approved the CMAR contracts for the office building and library at the new County campus on June 26, 2007. At the time of approval, the construction plan included sustainable design elements such as day-lighting, a reclaimed water system for use in flushing toilets, low water use toilets, use of energy efficient lighting and motion sensors in offices and conference rooms to minimize the amount of time lights remained on in unoccupied space. In previous presentations regarding the campus development, staff indicated additional sustainable design elements would be explored during the design process and brought forward for consideration should the advantages of doing so be supported by cost- benefit analysis. The HVAC system was a primary focus for additional sustainability features in the building. The consultants explored several options, including a ground source heat pump (geothermal) system similar to those constructed for the Justice Facility expansion project, but concluded the best application for the office building and library would be an air cooled chiller and gas fired boiler "4 pipe" system. While this 4 pipe system falls just short of the efficiency of a geothermal system, at the end of analysis, the site simply would not support the number of wells needed for the long-term longevity of a geothermal system. According to a life-cycle analysis opinion provided by the project's mechanical engineer, the four pipe system has a higher first cost, but delivers a respectable payback in approximately 8.9 years. Further, the proposed system has an estimated 20 year life, compared to 12 years for a conventional system. Given those circumstances and given the County's desire to move toward the highest sustainability possible within fiscal constraints, staff is recommending the proposed system to the Board. The project is on schedule for completion in late-Spring 2009 at which time the Library will be relocated from the Whitted Building to the new facility with the following departments slated for