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4 <br /> 'ICU C O SUI ANTS INC. <br /> Froincers <br /> ..ana i)MT10oment 0'.nsuaants <br /> #6014 <br /> April 5, 2001 <br /> Dr. Stephen Halkiotis <br /> Orange County Schools <br /> 200 E. King Street <br /> Hillsborough, NC 27278 <br /> Re: Cedar Ridge High School <br /> Fire Protection Water System <br /> Dear Dr. Halkiotis: <br /> With the help of Finkbeiner Pettis and Strout, Inc., we have completed a study of several <br /> fire protection system options forthe referenced site. After assessing the basic options and a few <br /> variations thereof, we suggest consideration of two viable fire protection options, as follows: <br /> OPTION#1 - Construction of a private 200,000 gallon cylindrical ground storage tank near the <br /> comer of Orange Grove Road and Grady Brown School Road. <br /> The tank would be approximately 45 feet high (overflow elevation t 745'), to provide <br /> enough system pressure to meet the necessary hydrant and sprinkler flow requirements without <br /> the need for booster pumps. Only the top half of the tank volume(100,000 gallons)will be useful <br /> for meeting site fire protection requirements, since anything below elevation 725' would not be <br /> high enough to create the minimum required pressure. The bottom 100,000 gallons of water <br /> would only be a necessary structural support for the water above it. The tank would be filled by <br /> the available pressure in the Town of Hillsborough's public water system, but water from the tank <br /> could not cycle back into the Town's system since the tank height would be far too low to allow <br /> any backflow under normal conditions. As a result, the tank and all its downstream piping would <br /> contain non-potable water, usable only for fire protection, irrigation, or other non-drinking <br /> purposes. <br /> The non-potable status of the system has the following negative consequences: <br /> a. A new non-potable waterline from the tank to the high school will be required, <br /> essentially parallel to the new potable waterline already being constructed by the <br /> project for the Town of Hillsborough. <br /> b. The onsite looped waterline and hydrant system designed by the Architect will <br /> require significant redesign. This onsite system is currently under construction and <br /> is a critical path item for project completion. <br /> 3622 Lyckan Parkway ■ Suite 3003 ■ Durham,N.C.27707 <br /> 919-490-1645 Phone ■ 919-403-0336 Fax . cMiengr @aol.com <br />