Orange County NC Website
Browse       Search
Erosion/Stormwater Comments <br /> Proposed Dunhill Subdivision <br /> Page 2 <br /> 3. However, based on preliminary calculations completed by Orange County stormwater <br /> staff, it appears that the proposed low density development will be close to these limits. <br /> Total nitrogen may be slightly higher than the limit while phosphorous was just below the <br /> limit. <br /> 4. If the project does exceed the nutrient limits, we prefer that reductions be made on-site <br /> utilizing the proposed stormwater treatment area. <br /> 5. The proposed the 6,000 square foot potential stormwater treatment area appears to be <br /> adequately sized based on preliminary calculations completed by Orange County <br /> Stormwater staff. We prefer that this area ultimately is designed as a stormwater <br /> wetland or bioretention. <br /> 6. As we understand, the roadway stormwater will be conveyed by grassed swales. We <br /> prefer that to the extent practicable the swales be designed as flat-bottomed, trapezoidal <br /> shaped swales. If possible they should be designed as water quality swales with flat side <br /> slopes (5:1), but should be no greater than 3:1. <br /> 7. A common septic area is proposed to serve 3 of the lots; stormwater runoff from <br /> impervious surfaces should not be directed to this area. In fact, concentrated flow should <br /> not be directed across any individual lot's septic field. <br /> O:AAdminstrativeASW Comments Dunhill Subdivsion 08062012.docx <br />