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