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<br />~'~~~IL ~ ~~ SI;Li ~~TS .~~. <br />~: i',ii t rninecr's <br />.aria im~•en~oment t ~:nsuuants <br />#6a14 <br />April 5, 2001 <br />Dr. Stephen Halkiatis <br />Orange County Schools <br />20D 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 for the 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 />.QPTION #1 -Construction of a private 200,000 gallon cylindrical ground storage tank near the <br />comer of Orange Grove Road and Grady Brown School Raad. <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 boaster 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 fitted by <br />the available pressure in the Tawn 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 law to allow <br />any backflow under normal condition onlAsfor fi e ~ protection ~ mgat on~ orsather non-drink nlg <br />contain non-potable water, usable y P <br />purposes. <br />The non-potable status of the system has the fallowing negative consequences: <br />a. Anew. 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 />