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Home My WebLink About20201117 Ver 1_More Info Received_20201008it �,] Lana WE , -. • US Army Corps of Engineers Asheville Regulatory Field Office Attn: Mr. David Brown 151 Patton Avenue, Room 208 Asheville, North Carolina 28801-5006 October 08, 2020 NC DEQ Division of Water Resources Asheville Regional Office Attn: Ms. Kaylie Yankura 2090 U.S. 70 Highway Swannanoa, NC 28778 Re: City of Brevard: Gallimore Sewer 232 Cashiers Valley Road, Brevard, NC 28712 Corps Action I D: SAW-2020-00211 DWR# 20201117 Nationwide Permit 12 Request David/Kaylie, This package is in response to DWR's and WRC's requests for additional information transmitted in emails dated September 16, 2020. DWR requested items: Please provide a plan and typical drawing describing proposed temporary impacts to streams and wetlands and how these impacts will be restored upon project completion. This response should address temporary access crossings, utility line replacement when the proposed CIPP method is not feasible, and for proposed trenching/excavation associated with manhole extraction. [15A NCAC 02H .0502 (c)] [15A NCAC 02H .0506(b)(2) and (3)] Atlas response: Temporary stream impacts for sewer line replacements where the CIPP method is not sufficient for repairs will be completed by an open cut trench method. Prior to excavation of the trench the reach of stream will be dewatered by the establishment of a pump around zone so the work can be completed "in the dry". Temporary sandbag check dams will be installed at the upper and lower extents of the permitted impact length. Two pumps will be used during the trenching, one large pump to carry the channel volume around the work area, and a second smaller dewatering pump to dry the work area. Once the replacement is complete the trench will be filled to the original channel bed elevation with the original stream bed substrate. Temporary impacts to wetlands (W1, W2, and W3) will only occur for construction access where required and will be in herbaceous wetlands. Mud mats will be used as requested by WRC to minimize compaction, ruts, and vegetation disturbance. Impact S1 is for the removal of the existing manhole located at 35.22829,-82.73688. The removal process for the manhole is illustrated on page 2, detail 3 of the attached drawings. The work area will be dried in a similar manner to the open cut stream impacts prior to work. The existing piping will be plugged for abandonment by a watertight, non -shrinking, grout as explained in the response below to prepare for removal. The existing lines will be cut at the grouted locations and the manhole will be lifted from the stream bed vertically from the banks. No equipment will enter the stream. ATLAS Environmental, Inc. 338 S. Sharon Amity Road, #411 Charlotte, North Carolina 28211 704-512-1206 (office) / 828-712-9205 (mobile) www.atlasenvi.com / Offices in Asheville and Charlotte it �,] Lana WE , -. • The stream banks will be re -graded to a stable slope and matched to the existing bank slopes at the upstream and downstream ends of the impact location. The upper portion of the bank, above the OHWM, will be stabilized with riprap and the lower portions of the bank will be stabilized with biodegradable coir matting. 2. The application indicates that utility lines that cannot be repaired will be abandoned and filled with concrete, and that many of these lines are located in stream beds. Please indicate what measures will be taken to ensure that concrete will not impact streams and/or wetlands during the proposed line abandonment activities. [15A NCAC 02H .0502 (c)] [15A NCA C 02H . 0506(b) (2) and (3)] Atlas response: There is only one section of sewer line that is unable to be repaired or replaced that is within or directly abutting a stream identified for abandonment. This section of sewer line is located at 35.22446,-82.73493 near Impact S1 and is along the upper reach of Jumping Branch. This section of sewer line is approximately 263 linear feet in length. The method for abandonment for this section of sewer line will be to pump a watertight, non -shrink, grout into the sewer line at both ends and allow time for the plug to cure prior to cutting the pipe. Simultaneously the new sewer line will be installed in high ground. The grouted and plugged section of line will be twice the diameter of the pipe that is being bypassed. For example, a 12-inch diameter pipe will have a 24-inch plug. See attached construction detail pages for illustration. WRC requested items: It is difficult to understand where the wetland and stream impacts are. The overall `Aquatic Resource Sketch Maps" do not show where the streams and wetlands are, and the detail maps do but are not referenced to the overall maps, so it's difficult to understand the overall layout of the project in regards to streams and wetlands. In addition, impact areas are not noted — they are noted in the plans, however. Can you provide lat-longs for each wetland and stream impact? Atlas response: Wetland impacts W1 (WL 3200): 35.22168 /-82.73386 W2 (WL 3100): 35.22244 /-82.73422 W3 (WL 3300): 35.22257 /-82.73429 Stream impacts S1 (CH 300): 35.22829 / -82.73688 S2 (CH 300): 35.22829 / -82.73688 S3 (CH 300): 35.22829 / -82.73688 S4 (CH 300): 35.22829 / -82.73688 S5 (CH 400): 35.22788 / -82.73200 S6 (CH 400): 35.22788 / -82.73200 S7 (CH 400): 35.22788 / -82.73200 S8 (CH 400): 35.22788 / -82.73200 ATLAS Environmental, Inc. 338 S. Sharon Amity Road, #411 Charlotte, North Carolina 28211 704-512-1206 (office) / 828-712-9205 (mobile) www.atlasenvi.com / Offices in Asheville and Charlotte it �'] Lana WE , -. • • Is it possible to cross the wetlands with mud mats to lessen compaction of the wetland soils? Atlas response: Yes, mud mats will be used for the temporary wetland impacts. • The plans note the specific project components associated with each stream impact (e.g., remove manhole, repair exposed pipe, repair/replace residential service). For each of the different types of work, please clarify what the specific stream impacts will be (e.g., install new pipe via trench cut) and provide typical drawings for each type of impact. Atlas response: Impact Specific Stream Impact S1 Pump around for removal of existing manhole and re -sloping of banks S2 Pump around and open cut trench for perpendicular replacement of residential service S3 Pump around and open cut trench for perpendicular replacement of residential service S4 Pump around and open cut trench for perpendicular replacement of residential service S5 Pump around and open cut trench for perpendicular replacement of residential service S6 Excavation of stream bank to add a riser to an existing manhole S7 Pump around and open cut trench for perpendicular replacement of residential service S8 Pump around and open cut trench for perpendicular replacement of residential service Please see the enclosed construction typical drawings. This package should be what is necessary to complete your review of the NWP 12 request. Thank you for your attention to the enclosed request. Please contact me if you need any additional information. Best regards, �4e' d1� Jennifer L Robertson, President J Robertson (cDatlasenvi. co Digital Copy: Andrea Leslie, WRC ATLAS Environmental, Inc. 338 S. 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