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Home My WebLink About20191386 Ver 1_Div4-BridgesScoping-Dec2018_20181206��f 31�'� l+�l d � .w�� .t ��r'�:. .�� IR � d � . f 5 . �. �: �� f � ��S el � ■ $P��y�.ty' N�RTH �.A�C?�IN� F��Y C{��F�ER �rrw�r�ir�rra�nl�� uorar� Gr�wr'r ri�k I�IC1-Er�EL �. REGA�1 ��; ��rF��;, LI1�D� �ULPERFER �n renr�a �a�-�+cr� December 6, 2018 MEMORANDUM TO: Greg S. Purvis, PE, Project Manager, Wetherill Engineering FROM: Rob Ridings, NC Division of Water Resources, Transportation Permitting Branch SUBJECT: Scoping Review of NCDOT's Proposed Bridge Replacement Projects: BR-011l (Bridges 3, 4, & 5, Edgecombe County); BR-0112 (Bridge 35, Edgecombe County); BR-0113 (Bridge 115, Halifax County); and BR-0116 (Bridge 80, Nash County). In reply to your correspondence received November 29, 2018 in which you requested comments for the above referenced projects, the NC Division of Water Resources offers the following comments: Project-Specitic Comments BR-0111, Bridges No. 3, 4, & 5, Over Swift Creek, Edgecombe County 1. Swift Creek and its tributaries are class C; NSW waters of the State. NCDWR is very concerned with sediment and erosion impacts that could result from this project. NCDWR recommends that highly protective sediment and erosion control BMPs be implemented to reduce the risk of nutrient runoff to Swift Creek. Post-construction stormwater BMPs should, to the MEP, be selected and designed to reduce nutrients. 2. This project is within the Tar-Pamlico River Basin. Riparian buffer impacts shall be avoided and minimized to the greatest extent possible pursuant to 15A NCAC 2B.0259. BR-0112, Bridge No. 35, Over Otter Creek, Edgecombe County 1. Otter Creek and its tributaries are class C; NSW waters of the State. NCDWR is very concerned with sediment and erosion impacts that could result from this project. NCDWR recommends that highly protective sediment and erosion control BMPs be implemented to reduce the risk of nutrient runoff to Otter Creek. Post-construction stormwater BMPs should, to the MEP, be selected and designed to reduce nutrients. 2. This project is within the Tar-Pamlico River Basin. Riparian buffer impacts shall be avoided and minimized to the greatest extent possible pursuant to 1 SA NCAC 2B.0259. � � .:D E��,� �,_a�.�� North Carolina Department of Environmental Quality I Division of Water Resources 512 North Salisbury Street I 1617 Mail Service Center � Raleigh, North Carolina 27699-1617 919.707.9000 BR-0113, Bridge No. 115, Over Rocky Swamp, Halifax County 1. Rocky Swamp and its tributaries are class C; NSW waters of the State. NCDWR is very concerned with sediment and erosion impacts that could result from this project. NCDWR recommends that highly protective sediment and erosion control BMPs be implemented to reduce the risk of nutrient runoff to Rocicy Swamp. Post- construction stormwater BMPs should, to the MEP, be selected and designed to reduce nutrients. 2. This project is within the Tar-Pamlico River Basin. Riparian buffer impacts shall be avoided and minimized to the greatest extent possible pursuant to 15A NCAC 2B.0259. BR-0116, Bridge No. 80, Over Gideon Swamp, Nash County 1. Gideon Swamp is class C; NSW; + waters of the State. The plus (+) designation means this water enters an ORW, Outstanding Resource Waters of the State, and is subject to the requirements thereof. The water quality classification of ORW is one of the highest classifications in the State. The NCDWR is extremely concerned with any impacts that may occur to streams with this classification. It is preferred that these resources be avoided if at all possible. If it is not possible to avoid these resources, the impacts shall be minimized to the greatest extent possible in accordance with 15A NCAC 2B.0225. Given the potent for impacts to these resources during the project implementation, the NCDWR requests that DOT strictly adhere to North Carolina regulations entitled "Design Standards in Sensitive Watersheds° (15A NCAC 04B .0124) throughout design and construction of the project. Pursuant to 15A NCAC 2H .1006 and 15A NCAC 2B .0224, NC DOT will be required to obtain a State Stormwater Permit prior to construchon. 2. This project is within the Tar-Pamlico River Basin. Riparian buffer impacts shall be avoided and minimized to the greatest extent possible pursuant to 15A NCAC 2B.0259. General Comments Regarding Bridge Replacement Projects l. The NCDWR is very concerned with sediment and erosion impacts that could result fram this project. NC DOT shall address these concerns by describing the potential impacts that may occur to the aquatic environments and any mitigating factors that would reduce the impacts. 2. If foundation test borings are necessary; it shall be noted in the document. Geotechnical work is approved under General 401 Certification Number 3883/Nationwide Permit No. 6 for Survey Activities. 3. lf a bridge is being replaced with a hydraulic conveyance other than another bridge, the NCDWR believes the use of a Nationwide Permit may be required. Please contact the US Army Corp of Engineers to determine the required permit(s). 4. If the old bridge is removed, no discharge of bridge material into surface waters is allowed unless otherwise authorized by the USCOE. Strict adherence to the Corps of Engineers guidelines for bridge demolition will be a condition of the 401 Water Quality Certification. 5. Whenever possible, the NCDWR prefers spanning structures. Spanning structures LtsLially do not require work within the stream or grubbing of the stream banks and do not require stream channel realignment. The horizontal and vertical clearances provided by bridges allow for human and wildlife passage beneath the structure, do not block fish passage and do not block navigation by canoeists and boaters. � D� E��,� �:_,��,�� North Carolina Department of Environmental Quality I Division of Water Resources 512 North Salisbury Street I 1617 Mail Service Center � Raleigh, North Carolina 27699-1617 919.707.9000 6. Bridge deck drains shall not discharge directly into the stream. Stormwater shall be directed across the bridge and pre-treated through site-appropriate means (grassed swales, pre-formed scour holes, vegetated buffers, etc.) before entering the stream. Please refer to the most current version of NCDWR Stormwater Best Management Practices. 7. If concrete is used during construction, a dry wark area shall be maintained to prevent direct contact between curing concrete and stream water. Water that inadvertently contacts uncw�ed concrete shall not be discharged to surface waters due to the potential for elevated pH and possible aquatic life and fish kills. Concrete shall be handled in accordance with the NPDES Construction General Permit NCGO10000. 8. Bridge supports (bents) shall not be placed in the stream when possible. 9. If temporary access roads or detours are constructed, the site shall be graded to its preconstruction contours and elevations. Disturbed areas shall be seeded or mulched to stabilize the soil and appropriate narive woody species shall be planted. When using temporary structures the area shall be cleared but not grubbed. Clearing the area with chain saws, mowers, bush-hogs, or other mechanized equipment and leaving the stumps and root mat intact allows the area to re-vegetate naturally and minimizes soil disturbance. 10. Sediment and erosion control measures sufficient to protect water resources must be implemented and maintained in accordance with the most recent version of North Carolina Sediment and Erosion Control Planning and Design Manual and the most recent version of NCS000250. 11. All work in or adjacent to stream waters shall be conducted in a dry work area unless otherwise approved by the NCDWR. Approved BMP measures from the most current version of NCDOT Construction and Maintenance Activities manual such as sandbags, rock berms, cofferdams and other diversion structures shall be used to prevent excavation in flowing water. 12. Heavy equipment shall be operated from the banlc rather than in stream channels in order to minimize sedimentation and reduce the likelihood of introducing other pollutants into streams. This equipment shall be inspected daily and maintained to prevent contamination of surface waters from leaking fuels, lubricants, hydraulic fluids, ar other toxic materials. 13. ln most cases, the NCDWR prefers the replacement of the existing structure at the same location with road closure. If road closure is not feasible, a temporary detour shall be designed and located to avoid wetland impacts, minimize the need for clearing and to avoid destabilizing stream banks. If the structure will be on a new alignment, the old structure shall be removed and the approach fills removed from the 100-year floodplain. Approach fills shall be removed and restored to the natural ground elevation. The area shall be stabilized with grass and planted with native tree species. Tall fescue shall not be used in riparian areas. General Comments if Replacing the Bridge with a Culvert 14. Placement of culverts and other structures in waters, streams, and wetlands shall be below the elevation of the streambed by one foot for all culverts with a diameter greater than 48 inches, and 20 percent of the culvert diameter for culverts having a diameter less than 48 inches, to allow low flow passage of water and aquatic life. Design and placement of culverts and other struchires including temporary erosion control measiues shall not be conducted in a manner that may result in dis-equilibrium of wetlands or streambeds or banks, adjacent to or upstream and downstream of the above structures. The applicant is required to provide evidence that the equilibrium is being maintained if requested in writing by the NCDWR. Tf this condition is unable to be met due to bedrock or other limiting features encountered during construction, please contact the NCDWR far guidance on how to proceed and to determine whether or not a permit modification will be required. � D� E��,� �:_,��,�� North Carolina Department of Environmental Quality I Division of Water Resources 512 North Salisbury Street I 1617 Mail Service Center � Raleigh, North Carolina 27699-1617 919.707.9000 15. If multiple pipes or barrels are required, they shall be designed to mimic natural stream cross section as closely as possible including pipes ar barrels at flood plain elevation and/or sills where appropriate. Widening the stream channel shall be avoided. Stream channel widening at the inlet or outlet end of structures typically decreases water velocity causing sediment deposition that requires increased maintenance and disrupts aquatic life passage. 16. Riprap shall not be placed in the acrive thalweg channel or placed in the streambed in a manner that precludes aquatic life passage. Bioengineering boulders or structures shall be properly designed, sized and installed. 17. Any anticipated bank stabilization associated with culvert installations or extensions should be addressed in the Categorical Exclusion (CE) document. It is understood that final designs are not determined at the time the CE is developed. However, the CE should discuss the potential for bank stabilization necessary due to culvert installation. 18. Any anricipated dewatering or access structures necessary for construction of bridges should be addressed in the CE. It is understood that final designs are not determined at the time the CE is developed. However, the CE should discuss the potential for dewatering and access measures necessary due to bridge construction. Thank you for requesting our input at this time. The DOT is reminded that issuance of a 401 Water Quality Certification requires that appropriate measures be instituted to ensure that water quality standards are met and designated uses are not degraded or lost. If you have any questions or require additional information, please contact Rob Ridings at 919-707-8786. .:D E��.� ��_,��,� �� North Carolina Department of Environmental Quality I Division of Water Resources 512 North Salisbury Street I 1617 Mail Service Center � Raleigh, North Carolina 27699-1617 919.707.9000