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Home My WebLink About20140762 Ver 5_R-2915 E modification request_original_20210901 Wanucha, Dave From:Hining, Kevin J Sent:Friday, August 27, 2021 5:14 PM To:Beckwith, Loretta A CIV USARMY CESAW (USA); Wanucha, Dave Subject:R-2915 E modification request_original Attachments:R-2915 E Stat 748 - original plan.pdf; proposed bore and jack at station 748.pdf Hey Lori and Dave, I’m working on a permit modification to R-2915 E (SAW-2012-00882; NCDWR # 20140762v.3). I’m working with our central office staff Erin Cheely to prepare everything, but wanted to give you a heads up about the issue, our plans to fix the issue, and to see about the possibility of moving forward before the permit modification is approved. We have a saturated slope that has routinely caused issues to the road shoulder (apparently for 15+ years) and most recently, resulted in a slide on the eastern road shoulder of HWY 221 in the vicinity of Stat 746-Stat 747. We believe the issue is runoff from the slope on the western side of HWY 221. Originally, we planned to take this water and pipe it to a 30” RCP-III pipe system that ran north under the new road and finally discharged into Little Naked Creek. This system was intended to carry roadway runoff from HWY 221 and the western slope. The original plansheet is attached above, titled “R-2915 E Stat 748 – original plan”. See Stat 748 to view this system (shown within black rectangle). Our central hydraulics unit and division staff no longer believe this system will handle all of the water. So, we plan to keep much of the proposed stormwater system intact, to carry roadway runoff. However, we would like to direct the runoff from/along the western slope into a new 42” pipe that will go directly under the road and discharge onto a rip rap pad and then allowed to flow over vegetation and into Little Naked Creek. Currently, there is a 24” CMP at this location, but it can’t handle the flow and is no longer serviceable – it will be filled with flowable fill. See “proposed bore and jack” attachment to view the proposed 42” pipe, and for referencing the information below. This modification, at first glance, would only involve stormwater changes. However, we can’t realistically excavate this new 42” pipe due to the depth of the pipe (> 15’) and the inability to close the road (high traffic, including several business and the Ashe County high school, with no realistic option for a detour). So, our only option is a bore and jack. The issue with this option is we will need to place the bore pit partially within Little Naked Creek and the surrounding wetlands. This will involve temporary impacts (stream dewatering) and permanent impacts (wetland impacts) at permit site 8B. Rather than try and pump water around, and risk pump failures during the operation, we think it would be best to install a temporary diversion, by way of a 175’ x 42” HDPE pipe. The temporary dewatering pipe and part of the bore pit will impact 0.2 acres of wetlands. While we think the wetland will return to its original condition fairly quickly once the work is done and repairs made, we are prepared to call these impacts permanent and mitigate for them if required (0.2 acres). Finally, since part of the bore pit will be within stream and wetland habitats, we know it will take on water. Luckily, the bore pit will be shallow, only 3-5 feet in depth, and any water that infiltrates the bore pit will be pumped out and ran through a silt bag, placed on the west bank of the stream below the wetland complex (so not in the wetland). This water will be allowed to run over natural vegetation before entering the stream. I know this is a lot, so more than happy to talk by phone and go over this together at your earliest convenience. Thanks a bunch! Kevin 1 Kevin Hining Division 11 Environmental Supervisor North Carolina Department of Transportation 828-386-7202 cell kjhining@ncdot.gov 801 Statesville Rd. PO Box 250 North Wilkesboro, NC 28659 Email correspondence to and from this address is subject to the North Carolina Public Records Law and may be disclosed to third parties. _____________________________________________________________ Email correspondence to and from this sender is subject to the N.C. Public Records Law and may be disclosed to third parties. 2 m Ltj LLE 25 0 25 50 PERMIT DRAWING SHEET 18 OF 46 SCALE FOR INSET JEMSICHARLESLR. COPE (20%)(40%), MLR (0 50 250 50 100 ANDJIMMY PHIL G I STEVENS/(4 20%) SCALE //)/ DENOTES FILL IN WETLAND DENOTES IMPACTS IN SURFACE WATER DENOTES TEMPORARY IMPACTS IN SURFACE WATER DENOTES TEMPORARY FILL IN WETLAND SP. CAT. V DITCH .} W/85 TONS CL B RIPRAP, O� 237 SY ti GEOTEXTILE SEE BERM BASE DITCH DETAIL Q W081 TONS CL 1 RIPRAP, 371 SY GEOTEXTILE SEE DETAIL R W/773 TONS CL BASE DITCH PRAP BERM BASE DITCH /O— POE '- PpE 1937 SY GEOTEXTILE SEE DETAIL N 'Apt SEE DETAIL 0 Boo DES' `�� --- ,/�y—wAm �— = SITE 9A �iGi1lE. * POE 111 TB 2GI — -- _—__-- —"F—STDAECT W/TO B GEOTEXTILERIF SY T H SEE DETAIL H TONS CL 1 RIPRAP,,, W/15 SY GEOTEXTILvy :UFFALO CREEK NG R/WW tt 0, CIS COUNTY OF ASHE II 20 1\AN WOODS SEE INSET A 9`rT, SITE 8A1 INSET A V10=3.6 Wsl 2SBW — 0SPRING x ‘gl SIA 4OTCB CAT-1 TL 30" CMP - Sd7r.R.�71li1 ^ /l DROP STRUCTURE / (DROP DEPTH=1.4') / 30" RCP —III 11 TONS CL I RIPRASEE INSET B W22 SY GEOTEXTILE ON BANKS ONLY SEE DETAIL AF IV10=8.3i W EX! IN INSET B / INSET C 72. CHL p / Wp \VC \\ A —A 3.10' 1.071—\2 V9� INFALL O -H \ 1"V FENCE _. BST PA 'V' DITCH SEE DETAIL X B—B 13.0' 2.00 I 8.0' OUTFALL JOHNNY J. SULLIVAN BST DA W \\ /\�NC CV o / OST PA \ \ C—C 8.0' 0.2 3.0'1 Sr_ 5.0' OUTFALL T. V DIT W/595.5 CONC.PAD EXISPINGA CONC PLUG & FILL SYSTEM W/ FLOWABLE FILL SITE 8B BDO REMOVE RISER & 9' EX. 24" CMP ':BI4SE DITC E ETAIL N 30" RCP —III PROJECT REFERENCE SHEET NO. R-29/5E 9 RAY SHEET NO ROADWAY DESIGN ENGINEER HYDRAULICS ENGINEER DOCUMENT NOT CONSIDERED FINAL UNLESS ALL SIGNATURES COMPLETED co Sf �S� U � Q G 72' CHL & 3SBW — E 7,NG R/W ORNER OF Yi7 exisri BUILDING cor✓c I CS PROPERTIES OF ASHE. INC. AT CONTROL URV.= 309061 ---- (SURVEYED 1006R6) EXISTING R/WR/w BST PA 50 PR CS PROPERTIES OF ASHE, INC. • M930 EXISTING R/W BST PA DI FOR DRN. DETAILS SEE SHTS. 2D-1 OR 2D-2 FOR —L— PROFILE SEE SHT. 20 FOR -SR1- PROFILE SEE SHT. 26 W O O 1- RK 'i( Pi (919)878-9560 900 Ridgefield Drive Suite 350 Raleigh, North Carolina 27609-3960 NC License No. F-0112 Engineers I Construction Managers I Planners I Scientists www.rkk.ccm Responsive People I Creative Solutions O 01 Q 3 CC O 02 N it P 0 R) 01 N C E 0 0 CC W to 51 Lrl OT'p 0_ PERMIT DRAWING SHEET 18 OF 46 25 0 25 50 SCALE FOR INSET JEMSICHARLESLR. COPE (20%)(40%), 50 25 0 50 100 ANDJIMMY PHIL 0 STEVENS/(t207.) SCALE BERM BASE DITCH W 1937TSNS Y GEOTEXTILB EAP SEE DETAIL 0 //)/ DENOTES FILL IN WETLAND DENOTES IMPACTS IN SURFACE WATER DENOTES TEMPORARY IMPACTS IN SURFACE WATER DENOTES TEMPORARY FILL IN WETLAND SP. LAT. V DITCH .} WB5 TONS 0 CL B RIPRAP, 237 SY ti GEOTEXTILE SEE DETAIL Q BERM BASE DITCH WA81 TONS CL I RIPRAP, 371 SY GEOTEXTILE SEE DETAIL R BERM BASE DITCH /O— PDE '-- PpE SEE DETAIL N PDE Boo DE----- '' �a °° /�eow t%�• SITE 9A yv�e---•- -- W U.1 W J U O / fN1l 1 / STD. V NS TCH W20 TO CL B RIPRAP 53 SY GEOTEXTILE SEE DETAIL H 7 TONS CL I RIPRA W/15 SY GEOTEXTIL CB - R' 30 UFFALO CREEK ) CIB COUNTY OF ASHE �I / �tG ftIV� - 0 1 9`rT SEE INSET A 8" 99 SITE 8A1 V10=3.6 Wsl 2SBW — POE 11 TONS CL I RIPRAP SEE INSET B W/22 SY ON BANKS GEOTEXTILE ONLY SEE DETAIL AF IV10=8.3 i / W 0 c /'S" E FtMe pl.94 •'t EIP; / 00 W d 1 1 dd INSET A 0SPRING X 40TCB —------f- 9 // DROP STRUCTURE / (DROP DEPTH-1.4') / 30" RCP —III / / 9'9 SITE 9B 1 \ 6 P� 99 99 18 001 I e/. �\ ti EXISTING 99 99 99 72• CHL 99 SBW — BST PA P STryG // A -A 3.10' �2 1.0V9� INFALL 'V' DITCH SEE DETAIL X BST PA G Tv n\ : 01 BST PA \R� \ Exi ' /. RW \ B-B 13.0' 2.0)L21�� I I 8.0' OUTFALL JOHNNY J. SULLIVAN C—C 8.0' 0.2 3.0 5.0' OUTFALL E-E .0' 3.00.5819� I I 6.0' OUTFALL T. V DIT W/595 . S D-D 7.0' 2.53 OUTFALL BDO REMOVE RISER & 9' EX. 24" CMP NAD �g/-4Ss007 PLUG & FILL SYSTEM W/ FLOWABLE FILL SITE 8B conc. i CS INSET B 1/" INSET C PROPERTIES OF ASHE, INC. EXISTING R/W BST PA BE E DITC SEE ETAIL N 72' CHL ORNER OF BUILDING AT CONTROL ELEV.— 3090.62 (SURVEYED 100616) 0 PP CS PROPERTIES OF ASHE, INC. • M8S0 EXISTING R/W PROJECT REFERENCE NO. SHEET NO. R-29/5E 9 RAY SHEET NO. ROADWAY DESIGN ENGINEER HYDRAULICS ENGINEER DOCUMENT NOT CONSIDERED FINAL UNLESS ALL SIGNATURES COMPLETED i i C 0 N W W O O -1- a J W RK 1 P: (919)878-9560 900 Ridgefield Drive Suite 350I Raleigh, North Carolina 27609-3960 NC License No. F-0112 FOR DRN. DETAILS SEE SHTS. 2D-1 OR 2D-2 FOR -L- PROFILE SEE SHT. 20 FOR -SR1- PROFILE SEE SHT. 26 Engineers I Construction Managers I Planners I Scientists www.rkk.com Responsive People I Creative Solutions