Orange County NC Website
Browse       Search
050 O R A N G E C O U N T Y <br /> INTEROFFICE MEMORANDUM <br /> 8712-1804 <br /> TO: Board of County Commissioners <br /> FROM: Marvin E. Collins,Planning Director <br /> SUBJECT: PD-4-87 McLennan ' s Farm - OWASA Comments <br /> DATE: December 30, 1987 <br /> COPIES: Albert Kittrell , Interim County Manager <br /> Planning Board <br /> Comments have been received from Orange Water & Sewer <br /> Authority regarding the proposed McLennan ' s Farm Planned <br /> Development. The comments are listed below, including the <br /> Planning Staff response based on information supplied by the <br /> applicant. <br /> 1 . Additional information should be provided to confirm that the <br /> proposed wastewater disposal system is properly designed and to <br /> assure its long-term reliability. This information should <br /> include a detailed site analysis to address soils which are only <br /> "marginally" suitable, the depth of the restrictive horizon, <br /> soil permeability above the restrictive horizon, and the extent <br /> of mounding that can be expected to occur. <br /> (A detailed soils analysis will be included as part of the <br /> application submitted to secure a permit to operate a "cluster" <br /> septic tank effluent pumping system. A preliminary soils <br /> analysis by the N. C. Department of Human Resources and the <br /> Orange County Health Department identified 2.75 acres of <br /> marginal soils where the nitrification fields are to be located . <br /> The remainder of the soils on site are unsuited for septic <br /> systems. ) <br /> 2. OWASA recommends a lower hydraulic loading rate not exceeding <br /> 0. 075 gallons per square foot per day, and a lower pollutant <br /> loading rate to protect long term ground and surface water <br /> quality. <br /> (The proposed hydraulic loading rate is 0. 10 gallons per square <br /> foot per day. This is 0. 025 gallons per square foot per day more <br /> than OWASA recommends. The soils on site are Appling Sandy Loam. <br /> The maximum recommended loading rate for such soils is 0.40-0.30 <br /> gallons per square foot per day. ) <br /> 3. Install a dual , alternating absorption field system and provide <br /> an additional undisturbed reserve area in case either system <br /> fails. <br /> (Treated effluent is discharged to two of four drain fields. The <br />