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HomeMy WebLinkAbout20140762 Ver 1_R-2915E_4B_Meeting_Minutes 2017 07 17_20170717Memorandum of Meeting Date: June 7th, 2017 Place: NCDOT, Structures Conference Room Team Members: Felix Davila (FHWA) — Absent Steve Kichefski (USEPA) - Phone Marella Buncick (USFWS) — Phone Marla Chambers (NCWRC) — Absent Dr. Cynthia Van Der Wiele (USEPA) April Norton (DWR) - Phone (for Dave Wanucha) Others Present: Bill Zerman, PE (NCDOT Hydraulics) Jeff Meador, PE (RK&K) Alexis Stys, EI (RK&K) Mark Staley (NCDOT-REU) - Phone Carla Dagnino (NCDOT-EAU) Trent Beaver, PE (NCDOT — Division 11) - Phone Joe Laws, PE (NCDOT — Division 11) - Phone Subject: NEPA\404 Merger Team - Concurrence Point 4B Meeting R-2915E — US 221 from US 221 Bypass to US 221 Business/NC 88 in Jefferson, Ashe County The Concurrence Point 4B Meeting for R-2915E in Ashe County was held on June 7t", 2017 in accordance with NCDOT policy. The meeting was held in the Structures conference room. The following items were discussed and conclusions reached. Notes rn red italics text were added to the notes following a field review by NCDOT staff on July 7, 2017. Bill Zerman opened the meeting with introductions and a brief description of the project. Jeff continued by providing a summary of the preliminary drainage design at each jurisdictional feature on the plans. The following comments and decisions were reached. Sheet 4: Jeff explained the differing colors on the plan sheet, pink being project R-2915D that is currently under construction. It was also requested to receive the permit impacts from R-2915D to avoid double counting impacts between the two projects. No comments on Sites 1 and 2, both propose the removal of existing R-2915D drainage. Site 2 includes a buried 42" pipe with no drop in the pipe. Velocities entering all wetlands should be stable (V10 less than 2.0 ft/s) Sheet 5: No jurisdictional features Sheet 6: Jeff explained both sites 3& 4 included rip-rapped energy dissipator basins to help lower the outlet velocities. April noted that Dave wanted to ensure these locations are non- erosive. Jeff pointed out that ditch designs for site 5 will be sure to include velocities entering the wetland lower than 2 feet per second. Velocities will be shown on the drawings. The plans show a JS stream leaving the existing 24" CMP at site 3. This stream is not jurisdictional and will be removed from the plans. At site 5 there is a jurisdictional stream leaving the existing 18" CMP that is not shown but will be added to the plans. Sheet 7: Jeff explained that site 6 included jurisdictional streams and wetlands both up and downstream. The stream begins at a spring approximately 230 feet upstream of the proposed crossing. He also indicated a drop structure is proposed near the outlet to lower the velocity exiting the pipe. The group agreed that NCDOT would coordinate with Marla Chambers to get her opinion on whether the short section of stream is providing aquatic habitat. If it is, the use of a drop structure may need to be revisited. Carla pointed out there is an additional Jurisdictional stream that is not shown that will be added to the plans at the outlet of the proposed 60 " pipe. Sheet 8: Jeff noted there was a proposed ditch to tie down to the stream at site 7. Marella noted the angle of the proposed ditch would be entering an outside bend and asked if this ditch could be realigned. Jeff responded that this could be done. Sheet 9: Jeff noted at site 8 that Bill had recommended the removal of the rip rap on stream banks (detail X). The attendees agreed this rip rap could be removed due to the low velocity in the proposed ditch. Jeff then pointed out the difficult design of site 9 with multiple springs and jurisdictional features traveling down a very steep hill. Carla noted that both spring/JS combinations upstream of S136 were not jurisdictional streams, only wetlands. A field visit by NCDOT biologists on 7/7/17 found that the JS line west of US 221 nearest the road (the headwaters of S136 originating in wetlands W109) can stay JS. The JS line further west within W108 can be removed. April asked if impacts would be to buffalo creek orjust a tributary. Jeff noted there to be a small unnamed tributary just at outlet 0907, therefore impacts will not occur to Little Buffalo Creek. An additional site is recommended to be added on sheet 9 at the outlet of the existing pipe near proposed box 0911. There is a 1.5' head cut at the outlet of the existing pipe and it is proposed to be plugged & filled, therefore some temporary impacts will be required during construction to re-grade the head cut. Sheet 10: Jeff explained the decision to retain the existing 66" CMP, which has been recommended by RK&K to have a smooth lining installed within. It was pointed out that temporary impacts will be needed for the upstream and downstream end during lining install, so a site will need to be added (site 11A). Bill also requested the addition of riprap at the outlet of this existing pipe and to also line the stream with embedded riprap for further stabilization. Jeff noted that at site 10 there is a proposed preformed scour hole. Bill requested a standard rip rap pad to be installed instead. Attendees agreed to replace the preformed scour hole with standard rip-rap. Carla informed the attendees that site 12 was not a jurisdictional feature and should be removed. During a 7/7/17 field visit, the stream at site 12 exiting the 18" CMP was found to be an intermittent jurisdictional stream, and should remain on the plans as a permit site. Steve questioned the quality of the stream at site 13 where a jurisdictional stream will be a total take with a proposed riprap lined standard ditch. April noted that a portion of Buffalo creek is a trout stream and she will need to review this area with Dave. Marella asked if site 13 was connected to the pond. Jeff responded by stating the system is believed to attach to a neighborhood upstream but the entrance was not found. Cara informed the attendees that the stream was not listed for a work moratorium, and asked to have agencies double check the list is up to date. Attendees agreed the current design was sufficient. Sheet 11: Site 14B was noted to connect to the existing pond and Jeff explained the existing pipe was well undersized. The existing pipe was currently laid at about 14%, therefore Steve commented that the current design seems sufficient to not be buried and include a drop structure. Sites 15 & 16 did not have any comments, however Jeff asked Carla if she believed the stream to begin where it was shown on the plan sheet or if it extended up into the wetland (S143a & W117). Carla shared that she believed the beginning of the stream to be shown at the correct location. Site 17 was noted to have no jurisdictional features upstream and Jeff explained that during the field visit, the exiting pond at the outlet of the system was dry. DWR and NCDOT Division staff do not know the current condition of the pond. Bill recommended the toe of rock fill be shown outside of the right-of-way. NCDOT does not want ponded water within the right-of-way. Add PDE and keep proposed pipe outlet at the current location. The JS lines on the east side of US 221 across from Site 17 (one parailel to the tree line/US 221 and one carried under US 221 in 42" CMP to the pond) were determined to be jurisdictional during a 7/7/17 site visit. These JS lines should stay on the plans. Sheet 12: At site 18, Bill requested to have the outlet pipe be realigned straighter and to have the outlet be ditched down to the current location of the jurisdictional stream. Attendees agreed to this design. At site 19, Jeff noted that a possible drop structure might be later incorporated into the design near the outlet of the pipe due to the current poor condition of the existing outlet, which attendees agreed was fine due to there being no jurisdictional feature upstream. A short JS stream (S147) will be added at the outlet of the 15" CMP near Site 19. Sheet 13: Site 21 includes retaining the existing 48" CMP and adding a smooth liner. Steve noted that the existing pipe was over 400' long and therefore fish passage will be difficult through such a long stretch. Marella agreed that there is probably not much passage and that the current design with a drop structure is okay. Sheet 14: The stream shown parallel to the roadway from 812+50 to 814+50 left is not jurisdictional and should be removed from the plans. There is a stream at Y36 11+50 right that will not be impacted that needs to be added to the plans. Jeff explained that site 22 includes a buried 66" pipe with a junction box but no drop structure. The proposed pipe slopes are 8% (HW to JB) and 0.5% (JB to outlet). Bill asked the attendees if we would in fact want to bury this pipe due to the steep slope. He stated as a rule of thumb, he usually uses a max of 4% slope for pipe burial. Because of the slope and the potential for headcutting the pipe will not be buried. Marella asked if there was any way to place baffles in the concrete pipe. Bill responded that there was not a way to put baffles in a concrete pipe. Carla noted that Naked Creek has no work moratorium and was not designated as TR. April noted that Dave had a question as to if the area was HQW. Steve requested that further investigation into the quality of water be done at this site and to keep the current design until 4C discussion. At site 23 Jeff noted that RK&K will add riprap to the outlet of the existing pipe to insure stability, attendees agreed. Sheet 15: At site 24 Jeff explained the design which includes a new 60" RCP buried 1.0' and removal of the existing pipe upstream of the crossing. Wetland W 123 will be a total take. Sheet 16: At the culvert on Sheet 16, Jeff explained that the current culvert would be retained and two additional 7'x4' cells would be added parallel to the exiting one to provide additional capacity. One of the two existing barrels will have a sill added to confine normal stream flow to one of the existing barrels (water can currently flow in both). The invert of the two new barrels will match the sill height. At site 27 the proposed pipe will not be buried because the slope exceeds 9.5%. Sheet 17: Wetland W125 will be a total take. 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'� .� ��''�,� �i i�w a ,'�a. !��` ��. `s �1 � �� _� '�s_ . L ._ � '} ... 1 . w t ._���.��___"4-.>- � :s� � p .� � . . h, µ - � '��, .� ���� ��� �� � � ����i �` � ���. ���� � � i�� �.. . > Sheet 11 Stream parallel to US 221 in NE quad. Flows into 42" CMP via DI at edge of woods * Top left: Drop inlet closest to US 221 * Top right and bottom left: parallel stream Both JS lines were previously thought to be non-JS, but they should remain 1S. 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