HomeMy WebLinkAbout20130223 Ver 7_U-2524D Site 4 Voluntary Repair Plans_20190307Carpenter,Kristi
From: Bailey, David E CIV USARMY CESAW (USA)
<David.E.Bailey2@usace.army.mil>
Sent: Thursday, March 07, 2019 2:21 PM
To: Thomson, Nicole J
Cr. Eason, Patty P; Parker, Jerry A; Moon, Chris D; Cvijetic,
Bojan; Snell, William H; Della Moore; Cheely, Erin K;
Matthews, Monte K CIV USARMY CESAW (US);
Norton, Apri) R
Subject: [External] RE: U-2524C/D; Greensboro Western Loop;
WBS 34820.3.30
Attachments: U-2524D Site 4 Voluntary Repair Plans.pdf
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Onc� th� work is compl�t�d to th� Corps satisfaction, this non-complianc� action will b�
clos�d out as "voluntary r�storation." Pl�as� not� that th� Corps will continu� to
participat� in sch�dul�d complianc� visits to assur� that all authoriz�d vvork is
compl�t�d as r�quir�d.
� -�`-
.
David E. �ail�y, PWS
R�gulatory Proj�ct Manag�r
US Army Corps of Engin��rs
CE-SAW-RG-R
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W� would appr�ciat� your f��dback on how w� ar� p�rforming our duti�s. Our
automat�d Custom�r S�rvic� Surv�y is locat�d ate
http;//corpsmapu.usac�.army.mil/cm_ap�x/f?p=136;4;0
From: Thomson, Nicole J [mailto:njthomson2@ncdot.gov]
Sent: Wednesday, March 6, 2019 3:37 PM
To: Bailey, David E CIV USARMY CESAW (USA) <David.E.Bailey2@usace.army.mil>;
Norton, April R <april.norton@ncdenr.gov>
Cc: Eason, Patty P<peason@ncdot.gov>; Parker, Jerry A<jparker@ncdot.gov>; Moon,
Chris D<cdmoon@ncdot.gov>; Cvijetic, Bojan <bcvijetic@ncdot.gov>; Snell, William H
<wsnell@ncdot.gov>; Della Moore <dmoore@rkk.com>; Cheely, Erin K
<ekcheely@ ncdot.gov>
Subject: [Non-DoD Source] U-2524C/D; Greensboro Western Loop; WBS 34820.3.30
Importance: High
Good afternoon —
The Division became aware last week (02/26/19) that the USACE and DWR
Authorizations for the above project expired on 12/30/18. After discussion with Division
staff, we are confidant that all permit sites (i.e. stream and wetland areas — aka "bottom
work") have been completed for this project. In other words, the Division is aware and
will be reiterating to its contractors that there cannot and will not be any work within
any areas that are subject to the Federal 404 and State 401, without requesting
authorization from your respective agencies. As a reminder, this project was
determined to be "exempt" from the Jordan Riparian Rules in locations within the
project study area (see attached FEIS mapping 1995 PDF).
As was also discussed, on U-2524 C there is one lateral ditch that has not been
constructed at this time; this ditch conducts flow from the Hazardous Spill Basin (HSB)
located on the "D" phase of the project. Originally, this ditch was to tie in to Horsepen
Creek with rip rap placed below the ordinary high water mark (OHWM) which would be
a regulated activity. The Division is exploring other options (i.e. rip rap dissipater pad,
matting, etc.) in upland areas to avoid this impact to the resource.
In October, the Division became aware of stream instability near Permit Site 4(STA
477+50 to 478+25 Left). The culvert was constructed and buried 1-foot below the
existing stream bed elevation (per the approved plan). This culvert also has no sills or
baffles. The bed load of the system is very silty and loaded with mica, typical of the
urban streams in this area. During the late summer/early fall Greensboro experienced
record rain falls including 2 tropical storms and 1 hurricane. The entire area has seen
extensive flooding and overtopping events which have caused many wash outs not only
on this project, but numerous others in the Division. The material in the culvert
ultimately scoured out to the concrete floor. Upstream of the culvert, the system has
begun to erode — the original stream was 2.5 to 3.5 feet wide. Class I rip rap was
installed along the embankment per the approved plans and stoped just before a
transition to pre-existing Class B bank stabilization (put there by others prior to the
project beginning). The flows this system has seen have effectively stripped the
embankment away. The system is now much wider as a result and has a vertical head-
cut located near the 4-inch ductile iron pipe for sewer clean out (just upstream of the
culvert inlet). The utility work did not cause the instability. The 8-inch sewer main was
installed via an open cut (per the approved plans) and is buried approximately 5 feet
below the stream bed. Ultimately, the poor bed material and significant flooding have
resulted in scour which has now created elevation and velocity issues which has resulted
in further stream instability for a distance of approximately 70-feet above the inlet of
�
the culvert crossing. Attached is a PDF of the original Site 4 Permit Drawing and a Photo
log showing before and after images.
In review of the authorizations issued for this project, the Division found the following:
From the USACE Authorization "Special Conditions" —
3. MAINTAIN CIRCULATION AND FLOW OF WATERS: Except as
specified in the plans attached to this permit, no excavation, fill
or mechanized land-clearing activities shall take place at any
time in the construction or maintenance of this project, in such a
manner as to impair normal flows and circulation patterns
within waters or wetlands or to reduce the reach of waters or
wetlands.
16. TEMPORARY IMPACTS RESTORATION MEASURES: Temporary
discharge of excavated or fill material into wetlands and waters
of the United States will be for the absolute minimum period of
time necessary to accomplish the work. All authorized
temporary wetland, stream, and tributary impacts will be
returned to pre-disturbance grade and contour, and re-
vegetated. In wetland areas where pipeline installation via
trenching is authorized, wetland topsoil will be segregated from
the underlying subsoil, and the top 6 to 12 inches of the trench
will be backfilled with topsoil from the trench.
21. CULVERTS:
B. Measures will be included in the construction/installation that
will promote the safe passage of fish and other aquatic
organisms. The dimension, pattern, and profile of the stream
above and below a pipe or culvert should not be modified by
widening the stream channel or by reducing the depth of the
stream in connection with the construction activity. The width,
height, and gradient of a proposed opening should be such as to
pass the average historical low flow and spring flow without
adversely altering flow velocity. Spring flow should be
determined from gauge data, if available. In the absence of such
data, bankfull flow can be used as a comparable level.
From the NC DWR Authorization, "General Permit Conditions" —
22. Unless otherwise approved in this certification, placement of
culverts and other structures in open waters and streams shall
be placed 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
structures including temporary erosion control measures shall
not be conducted in a manner that may result in dis-equilibrium
of wetlands or streambeds or banks, adjacent to or upstream
and down stream of the above structures. The applicant is
required to provide evidence that the equilibrium is being
maintained if requested in writing by NCDWQ. If this condition is
unable to be met due to bedrock or other limiting features
encountered during construction, please contact NCDWQ for
guidance on how to proceed and to determine whether or not a
permit modification will be required.
25. The dimension, pattern and profile of the stream above and
below the crossing shall not be modified. Disturbed floodplains
and streams shall be restored to natural geomorphic conditions.
Therefore, in order for the Division to be compliant with the above specific conditions at
Site 4, the Division proposes the following repairs to correct the stream instability (see
attached "Revised Sheet 12a of 25" and "Engineering Response" PDFs):
• Create a series of step-downs utilizing 4 x 3 x 2 foot boulders at this location to
address the bankfull shear stress (approximately 3.4 Ibs/sf)
• Bury the steps approximately 6 inches
• Key the steps into the banks
• Utilize geotextile fabric under the boulders to insure long-term stability
• Replace the missing and/or Class B rip rap with Class I rip rap along the stream
bank between the in-stream structures and the culvert inlet.
All of this proposed work falls within the 70 linear feet described between the 4-inch
sanitary sewer cleanout pipe and the culvert inlet.
The Division believes this proposal will address the instability issues (similar to Site 7)
and successfully restore the normal flow regime in this system (i.e. re-stablish a stable
pattern, dimension and profile).
Please advise with your thoughts and/or concurrence on our approach.
Thank you in advance —
Nikki
Nicole J. Thomson, PWS
Division Environmental Supervisor Assistant
Division Environmental Office
919-754-7806 Mobile
Nithomson2(c�ncdot.qov
PO Box 14996
Greensboro, NC 27415-4996
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PROJECT IMPACTS & LO55 OF FUNCTION
PARSONS
FALEIGH, NORTH CAROLINA
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343 E. SIX FORKS ROAD, SUITE 200 NC License
RALEIGH, NC 27609 Nvmber C-1554
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SEE DETAIL 37
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U-25240 9
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ROADWAY DESIGN HYDRAUUCS
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. -L- 478+65 LT
-L- 492+53 RT
DETAIL 21 -ePova- s+oo �r
RIP RAP AT EMBANKMENT
�Not�o s��e� DETAIL 29
�o,m, .� SPECIAL CUT DITCH
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D'itch 1_dmi� 1.5' fram
Grade < Diicl�
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PERMIT DRAWINGS
SHEET ll OF 25
LEGEND
�DENOTES IMPACTS IN
SURFACE WATER
�DENOTES TEMPORARY
IMPACTS IN SURFACE WATER
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THIS PORTION OF STREAM WILL REQUIRE
0.5 : 1 MITIGATION DUE TO INDIRECT
PROJECT IMPACTS & LO55 OF FUNCTION.
CULVERT CHANNE�
IMPROVEMENTS
(UPSTREAM)
SEE DETAIL 25
ClASS I RIP-RAP
EST.25 TONS
EST.55 SYGF
SINGLE-FACED -
BARRIER
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DETAIL 2
'V' DITCH 6EHIND
NOISE WALL
(Notro Scole)
PROPOSED
NOISE WALL b -
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-Gou� 7:1 p ti'.
Min. D= 1.0 H.
b = 3.0 F.
DETAIL 1
'V' DITCH BEHIND
NOISE WALL
�No�fo Scole�
PROPOSED
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ry��ural 1'i&. � � � - -
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DETAIL 18
TOE PROTECTION
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SCALE
DETAIL 13
SPECIAL LATERAL 'V' tlLTCH
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DDE - 201 CY
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LP,TERAL BASE DITCH SPECI;4L CUT DITCH wMINGE SPECIAL CUT DITCH MINGE LATERAL 'V' DITCH
�Nor�o s�oie� INo��o s�oi�i I�o��o s�oiel (Na��a s<oie� SPECIAI CUT DITCH
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DETAIL 37
'V' DITCH BEHIND
NOISE WALL
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DETAIL 25 ������ s=��a�
CULVERT CHANNE� IMPROVEMENTS
�UPSTREAM)
closs 'I' class •I'
R p Rop' � R p-Rap`
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FROM -RPBY8- STA. 5+86 TO STA.10+68 LT -�- q78+65 LT
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RIP RAP AT EMBANKMENT DETAIL 29
�No��o s�ie�
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Type olLner Class I Ri�Rop
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PARSONS
FALEIGH, NORTH CAROLINA
Foa ry
3
' FORKS ROAD, SUITE 200 NC Licer
NC 27609 Nvmber C-15
2' BASE DITCH
BEHIND NOISE'
SEE DETAIL 37
DDE �= 175 CY
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PROJECT REFERENCE NO. SHEET NO.
U-25240 9
RNJ SHEET NO.
ROADWAY DESIGN HYDRAUUCS
ENGINEER ENGINEER
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LEGEND
�DENOTES IMPACTS IN
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�DENOTES TEMPORARY
IMPACTS IN SURFACE WATER
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Cheely, Erin K
From: Moore, Byron G
Sent: Tuesday, January 29, 2019 10:59 AM
To: Cheely, Erin K; Nicole Thomson (nthomson@sepiengineering.com)
Cc: Lee, Craig J; Moore, Byron G
Subject: FW: Request for Additional Information_20130223v7_U-2524CD Modification_Guilford
Nikki and Erin,
I asked Craig Lee from hydro to look back at how the rip rap was sized for the inlet channel banks at this location (see his
email below). A 50 year storm is creating a shear stress of approximately 3.4 Ib/sf. Dave Rosgen has a chart in his design
book which correlates rock structure size (for cross vanes and similar structures) with bankful shear stresses. This chart
is based on bankful discharges, not larger 50 year storm events. The rock size recommended for a bankful event on this
chart is around 3.5 feet. So I would recommend 4 x 3 x 2 boulders at this location (which is usually the size we
recommend in other places.) If 6 inch drops are required, then boulders will need to be buried. I hope this answers
everyone's questions. Let me know if that works for everyone. Thanks for your help Craig.
Byron
From: Lee, Craig J <cjlee@ncdot.gov>
Sent: Tuesday, January 29, 2019 10:34 AM
To: Moore, Byron G <bgmoore@ncdot.gov>
Subject: RE: Request for Additional Information_20130223v7_U-2524CD Modification_Guilford
Byron,
These are the reasons Class I rip rap was proposed on the inlet banks. Based on the culvert size and the existing steep
banks the designer called to lay back the banks with a slope of 1.5:1 or flatter and stabilize. As shown below the shear
stress and velocity are inside the ranges for Class I rip rap. Let me know if you have questions.
Q10=160cfs, Q50=180cfs — For both discharges the velocity is approximately 5 f/s and shear stress 3.4 Ib/sf
Allowable shear stress for Class I rip rap is 4.2 Ib/sf
Typically, if velocities are less than 10 fps then Class I rip rap is adequate.
Based one the photo that was attached in a previous email the Class I rip rap seems to be stable.
�
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ESfi. �� T�JI�S
E�ST. �� SYGF
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Thanks,
Craig J. Lee, PE
Engineer III - Western Design Support - Divisons 7, 9-14
North Carolina Department of Transportation
Hydraulics Unit
919 707 6708 office
cilee(a�ncdot.qov
US Mail:
1590 Mail Service Center
Raleigh, NC 27699-1590
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