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<br /> <br /> <br /> <br /> <br /> <br /> <br /> <br /> <br />Water Narrative <br /> <br />The potable water system for the proposed development will consist of one onsite community well to <br />supply water for the development. The design basis is to provide high quality potable water for the future <br />residents of the Rigsbee property subdivision. The design is based on minimum NCDEQ standards and <br />regulations. The system is sized for 40 single-family detached residences. The system is sized for <br />residential peak flows per NCDEQ guidelines. <br /> <br />The system will consist of a well house, well pump, hydropneumatic tank, liquid chlorine disinfection, <br />greensand filtration (or equivalent) filters, valving and appurtenance. The water quality report received <br />during testing of well indicated the water source was over the allowable limits for manganese. A <br />greensand (or equivalent) filtration system is proposed to reduce the manganese concentrations below the <br />allowable limits. In addition, the water will be disinfected with liquid chlorine. The water will be stored in <br />a hydropneumatics storage tank that will provide the necessary storage required and regulate the pressure <br />of the distribution system. <br /> <br />Septic Narrative <br /> <br />The subdivision proposed disposing of wastewater effluent by individual onsite systems designed to 15A <br />NCAC 18E Wastewater Treatment and Dispersal systems and Orange County Rules for Onsite <br />Wastewater Treatment and Dispersal Systems. Based on a preliminary soils analysis, each site is <br />anticipated to utilize conventional disposal methods (trench systems). Each home will have a septic tank <br />sized for the proposed number of bedrooms and if necessary, a pump tank. Influent will flow into the <br />septic which will provide both treatment and solids removal. An effluent filter will be installed at the <br />outlet end to prevent solids from leaving the tank. It will then either gravity to the drain field or flow into <br />a pump tank. The pump tank if required will house the equipment required to pump the septic tank <br />effluent to the pressure manifold which will proportionally direct the effluent to the drain field. As <br />reference, there are surrounding neighborhoods (Heritage Hills, Rolling Hills, Rolling Woods and <br />Dogwood) that have minimum 20,000 sf lots utilizing onsite septic systems. <br />P.O. Box 129 <br />Morrisville, NC 27560 <br /> <br />(919) 467-1239 <br />501 Cascade Pointe Lane <br />Suite 103 <br />Cary, NC 27513 <br />www.macconnellandassoc.com <br /> <br /> <br />MacCONNELL & Associates, P.C. <br />"Engineering Today For Tomorrow's Future" <br />65