Orange County NC Website
Browse       Search
65 . <br />CONSULTING ENGiN1=EKING ~ ARCHITI=CTURC ®SURVEY{NG <br />August 29, 201 l <br />Mr. Gleaan 1~: Bowles, ATCI?, CFM <br />+Qratage County Ptanning & Inspections Dept <br />-1.31 West Margaret Lane <br />I-~illsborougi~, NC 27278 <br />111€e: i~vailua'tion of S'ys#em ~Aepnauds ffox "Tannin Woei:dlsn Developmen# <br />Dear Gler;n: <br />dr~hehalf of our client and the applicant, Habitat for Hui>Qanity, Orange County, Inc, <br />Summit Consulting would~like to address the anticipated impacts of the proposed 8" . <br />waterline as it relates to the existing pressures and capaci#y of the O~~.nge-Alamance <br />Water System's tOAWS) existing 12" ixlain, which currently services all of the existing. <br />demazxds of their system. Follo~,ving discussions az~d the receipt of flow test results from <br />Mr. Danny Jef#`ries, OAWS Distribution Manager, oq August 22, 20l 1, it was anticipated <br />that the optimal minimum desired flow x~.te of 1000 GPM at 20 psi may not be <br />characteristic of the existing system, even if a 12" line were extended up Tannin Road in <br />lieu-of the proposed $" line. Mr. Jeftx-ies concurred that 750 GPM is typically accepted <br />and is most IiIcely obtainable-with the proposed $" line. A.ddi4ionally, rased on <br />discussions with other water resource; engineers, several rural water systems may-only <br />guarantee 500 Crl'M in residential districts- <br />I-Iov~tever, in review of the flaw data presented by OAWS, the overall_static and residual <br />pmssr~es~of the system a~nund the site t7uettrated between 68-II4 psi and SS••b9• psi <br />respectively, In a preliminary analysis of the data provided, it can 6e anticipated that a <br />hydrant at the end of the Tinnin Road extensio~l will provide +/- 1000 GFM at a static <br />pressure of 76 psi and a residual presstre of 40 psi. While a detailed analysis will be <br />conducted prior to permitting £or com5lzuction drawings and extensions with NCDENR- <br />I3ivisiou of Water Quality, the preliminary calculations p>•ovide an acceptable margin for <br />changes and corrections without falling below acceptable Levels. <br />Summit Consulting looks forwud to discussing these matters with you ox the kespective <br />Boards furthe~•. <br />Si>ucerely, <br />M1VY CONSU <br />Chad E. Ahbott, PE <br />Civil Department <br />3117-Op92\Cfvil~Submitta1512Ut L•08-29 OC - Waterl'eue Suuunary~20[ I•U8-74 Res~orssc Lttdoc <br />504 Meadawtand Drive Colpcrafe Office 848.732.3883 • Fax 949.7326&7B <br />Hilishoraugh, NC 27278 www.summEt-engineet:~m GentecttnicaVCMT 948.732.8500 • Fax 949.732.8599 <br />,~ <br />r-:, <br />