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The "right bank" contains single-family residential uses (the <br /> commercial/industrial area lies across the ridge line out of this <br /> watershed) . Only a portion of these houses are on land that <br /> actually flows into the reservoir (see hydrology map) , as many <br /> homes are on land that drains into Little River, downstream of the <br /> impoundment. All of the houses are served with Durham city sewer. <br /> Wastewater (and stormwater) from the "right bank" residential area <br /> is piped out of the watershed via a gravity flow sewer line which <br /> takes the wastewater/stormwater up the shoreline, and through a <br /> ridge cut into another sub-basin. The only sewer pumps on the <br /> "right bank" are basement pumps in some houses which would lift the <br /> wastewater to sewer lines in the streets. <br /> The "left bank" of Treyburn (Phase IV) is undeveloped at this <br /> point, but would also consist of single-family residences that <br /> would use city sewer service. The final map in this enclosure shows <br /> the site plan for this phase of Treyburn. <br /> Wastewater from the "left bank" residential development will also <br /> be piped out of the watershed into the Durham system, via a unique <br /> "double" sewer line. Should a malfunction occur with one sewer <br /> line, the wastewater will be shifted into the second parallel line. <br /> Other backup systems are also in place to help control any <br /> potential system problems. However, the sewer lines on the "left <br /> bank" are not gravity-flow, but are force mains pumped via pump <br /> stations - which would be located in the residential area. <br /> Because of these engineering techniques that keep wastewater and <br /> stormwater from entering the lake, it is the opinion of Durham <br /> staff that there is little impact from Treyburn on the water <br /> quality of Little River Reservoir. <br /> I will bring the large version of the Treyburn hydrology map to the <br /> November 1 meeting in case there are any questions. I hope this <br /> information proves helpful, and please let me know if I can be of <br /> further assistance. <br /> copies: Board of Commissioners <br /> John Link, County Manager <br /> Marvin Collins, Planning Director <br /> ,/Beverly Blythe, Clerk to the Board <br /> Gene Bell, Planner III-Comprehensive <br /> Mary Willis, Planner III-Current <br /> Warren Faircloth, Erosion Control Supervisor <br /> Emily Cameron, Planner II - Current <br />