20190992 Ver 2_U2719_Buffer Auth Mod Request 05052020_20200506

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STATE OF NORTH CAROLINA
DEPARTMENT OF TRANSPORTATION
Roy COOPER
GOVERNOR
May 5, 2020
NC Environmental Quality
Division of Water Resources
Transportation Permitting Branch
1617 Mail Service Center
Raleigh, NC 27699
ATTN: Mr. Rob Ridings, NCDOT Project Coordinator
J. ERIC BOYETTE
SECRETARY
Subject: Request for Modification to the Neuse Buffer Authorization for U-2719 — Improve
Existing I-440 Beltline, from south of SR 1313 (Walnut Street) to north of SR 1728
(Wade Avenue)
Reference: Regional General Permit Number 31 Verification (Action ID: SAW-2012-01414) dated
August 21, 2019
401 Water Quality Certification and Neuse Buffer Authorization (DWR Project No.
20190992) dated August 26, 2019
Dear Sir:
The North Carolina Department of Transportation (NCDOT) requests modification to the existing Riparian
Buffer Authorization for the widening and improving of I-440/US 1 from SR 1313 to SR 1728 (TIP
R-2719) in Wake County. This project is currently under construction.
This modification will result in no changes to the previously permitted wetland and stream
impacts. This modification results in an additional 2,619 square feet (sq ft) of riparian buffer
impacts in Zone 1 and 2,027 sq ft in Zone 2. The total project impacts for U-2719 include 1,499
If of permanent stream impacts, 6991f of temporary stream impacts, 0.04 ac of permanent
wetland impacts, no temporary wetland impacts, no hand clearing in wetlands, and 121,936 sq ft
of buffer impacts (80,491 sq ft in Zone 1 and 41,445 sq ft in Zone 2).
Please see the enclosed revised buffer drawings and updated impact summary sheets which
reflect the changes in impacts as well as the following updated tables and explanation.
Explanation of Buffer Impact Site Modification Being Requested
Site 4 (Sheet 12/12B): Site 4 allowable buffer impacts have changed as a result of the need for
an overhead utility relocation and access road adjacent to Jones Franklin Road. There is an
increase in the allowable buffer impacts in both zones due to the relocation of the overhead line
Mailing Address: Location:
NC DEPARTMENT OF TRANSPORTATION Telephone: [phone] BIRCH RIDGE DRIVE
ENVIRONMENTAL ANALYSIS UNIT Customer Service: 1-877-368-4968 RALEIGH NC 27610
1598 MAIL SERVICE CENTER
RALEIGH NC 27699-1598 Website: www.ncdot.gov

and need for a guy wire required for a turn in the line. The impacts have been minimized by
placing these in locations where the buffers are currently actively maintained by mowing. This
is an ongoing and continued use and will not be changed by the utility line. The increase in
allowable buffer impacts at Site 4 in Zone one is 2,609 sq ft and 2,027 sq ft in Zone 2. This
makes the total allowable impact in Zone 15,604 sq ft and Zone 2 is 4,248 sq ft for Site 4.
Revised Permit Impact Tables
The following tables illustrate the updates to the impacts that were previously provided in the
electronic PCN.
Revised U-2719 Jurisdictional Resources Impacts
Riparian
Wetland
Non-
Riparian
Isolated
Stream Of)
Riparian
Impact Type
Temp./
Wetland
Wetlands
Ponds
Buffer
Perm.
Temp./
(ac)
(ac)
Perm.
Temp.
(sq ft)
(ac)
Perm.
Zone 1/2
(ac)
Neuse River
Basin
0.0/
0.0
0.0
1.25
1499
699
80,491/
(HUC
0.04
41,445
03020201
Bolded impact amounts represent a change from the 464 (SAW-2012-01414) issued on August 21, 2019 and 401
WQC (20190992) issued August 26, 2019.
Revised U-2719 Riparian Buffer Impacts
Mitigation
Allowable
9
Total
Wetlands
Impacts
requirements
with
Allowable
Impacts
in
Requiring
(s ft)
mitigation
Buffers^
Mitigation
Zone 1 Impact
36,666
43,825
80,491
50
36,666
Zone 2 Impact
20,060
21,385
41,445
25
20,060
^ Allowable, non-mitigable buffer impacts have been deducted from wetlands in buffers. Bolded impact amounts
represent a change from the 404 (SAW-2012-01414) issued on August 21, 2019 and 401 WQC (20190992) issued
August 26, 2019.
There is an increase in allowable impacts based on the additional impacts of the utility relocation at Site 4
on Plansheet 12/1213. The additional buffer impacts have been illustrated as allowable due to the fact that
the area of impact is currently maintained and there should be no change in existing and ongoing use of
the buffer.
Compensatory Mitigation
No compensatory mitigation is proposed because the change in buffer impact is considered allowable due
to the existing and continued use of the buffers. Table 1 below illustrates the current summary of impacts
requiring mitigation which has not changed since the original permit application.
2

❑-2719 Proposed C ni ertsatot Mitii afion No Chan
es
Riparian
Non-
Isolated
Riparian Buffer
Riparian
Mitigation Type
Wetland
Riparian
Wetlands
Stream
Calculations ft
Buffer
Zone I
Zone 2
(lie)
Wetland
(ac)
00
Total
ac
Og ft
Meuse Basin
36,666 x
20,060 x
(HUC 3020201)
0302
0.0
0.0
0.0
860
3.0 =
1.5 =
140,089
109,998
30,090
Bolded mitiaalion amounts renmsent a chanve from the 404 (SAW-2012-01414) issued on Auvusl 21. 2019 and 401
WQC (20190992) issued August 26, 2019.
No changes are proposed regarding compensatory mitigation for the project since the 404/401
Authorizations dated August 21, 2019 and August 26, 2019, respectively.
Thank you for your assistance with this project. If you have any questions or need additional information,
please contact Jason Dilday at either j [e-mail] or (919) 707-611 L
Sincerely,
Jason
Dig ltaBysignedby
Jason D11day
d
Date:2020.05.05
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Jason Dilday
Environmental Senior Specialist

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CULVERT INLET STABILIZATI N
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SEE SHEET 2D-2
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DETAIL AY1
CULVERT OUTLET STABILIZATION
( Not to Scale)
\EXISTING BANK
1.5:1 or FLATTER
2' THICK CL II RIP -RAP
PROPOSED
EXCAVATION
CLASS II RIP RAP
CULVERT
Length = 88 ft GEOTEXTILE MIN. 1'
(downstream of TUCK
end of culvert)
Type of Liner= CL II Rip -Rap - Keyed -In EXISTING GROUND
STA. 39 + 01 —Y10— LT
iKl
DETAIL AX
CULVERT INLET STABILIZATION
( Not to Scale)
Natural Bed
Elevation
Natural Natural
Ground Ground
2'
Geotextile >
on banks only Channel Bed
Length= 30 Ft. (Variable)
Type of Liner= CL II Rip -Rap - Keyed -In
STA. 41 + 4 8 —Y10— RT
DETAIL AY2
CULVERT
OUTLET STABILIZATION
( Not to Scale)
Natural
1.5:1 or Flatter
Natural
_
Ground
\ Proposed Ground
\Excavation\ ,( 2' Thick
Length = 88 ft
\ CL II Rip -Rap
(downstream of
�� Geotextile
end of culvert)
Channel Bed
Width Varies
(Variable)
Type of Liner= CL II
Rip -Rap - Keyed -In
STA. 39 + 01 —Y10— LT
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U-2719 12B
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UNLESS ALL SIGNATURES COMPLETED
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LEGEND
MITIGABLE IMPACTS ZONE 1
ALLOWABLE IMPACTS ZONE 1
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ALLOWABLE IMPACTS ZONE 2
— — — — -
EXISTING TRANSPORTATION
FACILITY
BUFFER DRAWING
SHEET OF

RIPARIAN BUFFER IMPACTS SUMMARY
IMPACTS BUFFER
TYPE ALLOWABLE MITIGABLE REPLACEMENT
Site Station Structure ROAD PARALLEL
No. (From/To) Size / Type BRIDGE ZONE 1 ZONE 2 TOTAL ZONE 1 ZONE 2 TOTAL ZONE 1 ZONE 2
CROSSING IMPACT (ft) (ft) (ft) (ft) (ft) (ft) (ft) (ft)
1
SAK - 230+75 -L1A- Lt
Rip Rap at 18" Outlet
X
1272
1272
3
SX - 245+72 -L1A-
Culvert Clean Out
X
1753
212
1965
Bank Stabilization
X
3612
1923
5535
4
SW - 41 +85 -Y10- Rt
Rip Rap in Stream
X
5604
4248
9852
3711
3711
6*
X
7
ST - 284+75 -L1- Rt
Outlet Stabilizaton
X
X
408
408
1052
871
1923
8**
SV - 286+00 -L 1- Rt
9
SU - 284+50 -L1- Lt
Bank Stabilization
X
3931
1346
5277
12
SS - 17+50-Y25RB- Lt
Channel Imp./Bank Stab.
X
6199
3968
10167
13
SR -16+20-Y25RC- Rt
Roadway Fill/Outlet Stabilization
X
8902
7738
16640
14
SO - 15+79-Y25RD-
Roadway Fill
X
X
6846
1384
8230
14827
7423
22250
15
SP - 11 +90 -Y29E-
30" CSP
X
3767
3730
7497
16
SN - 365+75 -L3- Rt
36" WSP & 36" CSP
X
X
3379
367
3746
775
206
981
17
SC - 433+33 -L3-
8' x 8' Culvert Extension/Stab.
X
3660
1592
5252
18
SAN - 433+00 -L3- Rt
2' Base Lateral Ditch
X
3035
2070
5105
19
SE - 466+00 -L3-
48" RCP Extension
X
2179
926
3105
20
SW - 18+75 -Y9-
14' x 7' RCBC
X
5146
3035
8181
21
SC - 38+70-Y35RA- Rt
Bank Stabilization
X
433
406
839
TOTALS*:
43825
21385
65210
36666
20060
56726
0
0
NOTES-
* POND OWC BUFFER IMPACTS REMOVED DUE TO CITY OF RALEIGH CONTRACT
** SITE 8 BUFFER IMPACTS REMOVED DUE TO UTILITY EASEMENT MAINTENANCE AND 4C DISCUSSION
2018 Feb