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HomeMy WebLinkAbout20071531 Ver 1_WRC Comments_20071010~ North Carolina Wildlife Resources Commission ~ October 10, 2007 Ms. Loretta Beckwith U.S. Army Corps of Engineers, Regulatory Branch 151 Patton Avenue, Room 208 Asheville, North Carolina 28801-5006 Mr. Ian McMillan NCDENR, Division of Water Quality, 401 Certification Unit 1628 Mail Service Center Raleigh, North Carolina 27699-1628 SUBJECT: Mr. Sheldon Harnash, SJH Enterprises, LLC Nationwide Permit Application Culvert and pond Buncombe County DWQ No. 07-1531 Dear Ms. Beckwith and Mr. McMillan: Wetland and Natural Resources Consultants requested on behalf of Mr. Sheldon Harnash of SJH Enterprises, LLC a letter of concurrence from the North Carolina Wildlife Resources Commission (Commission) fora 404 Permit. Comments from the Commission are provided under provisions of the Clean Water Act of 1977 (33 U.S.C. 466 et. seq.) and Fish and Wildlife Coordination Act (48 Stat. 401, as amended; 16 U.S.C. 661-667d). The applicant proposes construction of a road and pond in wetlands and an unnamed tributary to Pole Creek near Enka. The pond would serve as an amenity and recreation area for the 64 acre StoneRidge at Hayes Mountain subdivision. Total direct impacts would be 228 feet of stream and 0.112 acre of wetlands. If permitted, the project should not harm trout. However, this is contingent upon the use of effective erosion control devices during construction to minimize downstream sedimentation. Pole Creek may support a small trout fishery downstream of the property, but data are not available and watershed conditions do not appear conducive to the maintenance of trout habitat in this watershed. Although the project should not harm trout, it would eliminate and fragment wetlands that intercept and treat stormwater. The wetlands also provide habitat for amphibians and reptiles. Small headwater wetlands in pastures provide good wildlife habitat when they are lightly grazed. Herbaceous vegetation also recovers quickly in these and more heavily grazed wetlands once cattle are removed. Based on the photographs in the application, this rapid recovery appears to have happened in the subject wetlands. Stream and wetland impacts could be minimized if the pond was constructed upslope of the proposed location. In addition, other small ponds could be constructed in ephemeral drains on the property such as the drain north of the wetland on lot 1 and in the drain at the back ends of lots 10, 11, and 12. According to the application, other drains Mailing Address: Division of Inland Fisheries 1721 Mail Service Center Raleigh, NC 27699-1721 Telephone: (919) 707-0220 Fax: (919) 707-0028 SJH Enterprises Page 2 October 10, 2007 Buncombe on the property would be used for stormwater treatment facilities, but these facilities were not depicted in the plans and stormwater treatment is described as grassed swales and existing buffers (Section XI). Moreover, stormwater treatment has been proposed as justification for other pond projects in Buncombe County. If the pond is permitted in its proposed location, then use of the dam for the road crossing instead of across the stream and wetlands above the pond should be considered. Mitigation with 390 feet of stream enhancement, 0.033 acre of littoral shelf creation, and 0.05 acre of wetland preservation is proposed in the application, but the attached mitigation plan specifies 250 feet of stream enhancement, 0.07 acre of wetland enhancement, and 0.103 or 0.033 acre of littoral shelf construction. In addition, the riparian buffer width is not described and the wetland enhancement appears actually to constitute wetland creation. Regardless of these uncertainties, if the project is permitted, then a revised mitigation plan that fully accounts for the impacts and that is consistent with the April 2003 Stream Mitigation guidelines should be prepared. Riparian buffers of at least 30 feet in width are specified in the guidelines for restoration and enhancement activities on streams. A ratio of at least 1:1 is recommended for all stream impacts, including flooding because this permanently eliminates stream habitat. This also helps off-sets a host of direct and indirect adverse effects of pond construction such as stream and wetland fragmentation, aquatic life blockage, and reduced downstream hydrology, sediment transport, and organic material transport and processing. Moreover, a minimum 1:1 ratio is recommended because the streams and wetlands on the site have been degraded by cattle access, and perhaps overgrazing, but natural functional improvements, most notably herbaceous vegetation recovery, often occurs rapidly in these situations. This appears to be the case with the wetlands on the property. If this project is permitted and certified, then Commission recommends that the following measures be attached and implemented to help conserve aquatic habitats: 1. The compensatory mitigation plan is revised to be consistent with the Stream Mitigation guidelines. A 1:1 ratio is applied for all stream impacts and 30-foot buffers are established along any stream segments. 2. The Nationwide and Final Regional Conditions (except 1.2) are adhered to. This includes partial burial of culverts beneath the natural stream bed grade as specified in Final Regional Condition 3.6. 3. Sediment and erosion control measures are used before construction and maintained until all disturbed soils are permanently stabilized. Any bare soils are seeded as soon as possible after disturbance. Tall fescue is not used along streams. 4. A sleeved standpipe is used to draw outflow water from near the bottom of any ponds. Cold water intakes should be within 1-2 feet of the bottom of the lake or pond bed, but not on the bottom. This design will improve water quality in impoundments. The easiest way to accomplish anear-bottom outflow is to place a larger pipe (i.e. shroud or sleeve) over the standpipe so that water flows up through the bottom of the larger pipe and then down through the outlet pipe (see inset). pond surface outflo~- ~ water inflow pond bottom If there are any questions regarding these comments, please contact me at (828) 452-2546 extension 24. SJH Enterprises Page 3 October 10, 2007 Buncombe Sincerely, ,~ Dave McHenry Mountain Region Coordinator, Habitat Conservation Program cc: Wetland and Natural Resources Consultants