20191337 Ver 2_I-5507 Renewal and Mod Mecklenburg July 23 2020_20200723

Mailing Address:Telephone: [phone] Location:
NC DEPARTMENT OF TRANSPORTATION Fax: [phone] 1000 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
STATE OF NORTH CAROLINA
DEPARTMENTOF TRANSPORTATION
ROY COOPER J. ERIC BOYETTE
GOVERNOR SECRETARY
July 23, 2020
U. S. Army Corps of Engineers
Raleigh Regulatory Field Office
3331 Heritage Trade Drive, Suite 105
Wake Forest, NC 27587
ATTN: Mr. Monte Matthews
NCDOT Coordinator
Subject:Request for Modification and Permit Renewal for Section 404 General Permit No.
198200031 and Section 401 Water Quality Certification for the Interstate 485 (I-485)
improvements from I-77 to US 74 (Independence Boulevard), Mecklenburg County,
Division 10, TIP I-5507.
Reference: 1) Section 404 Regional General Permit No. 198200031 (GP 31), Action ID
No. SAW-2013-02330, issued December 18, 2019; 2) Section 401 General Water Quality
Certification No. 4135, NCDWR Project No. 20191337v.1, issued December 2, 2019.
Dear Sir:
The purpose of this letter is to request modification of the United States Army Corps of Engineers (USACE)
Section 404 Regional General Permit 198200031 (GP 31) for the above referenced project and to request
renewal under Regional General Permit SAW-2019-02350 (RGP 50) and North Carolina Division of Water
Resources (NCDWR) Section 401 Water Quality Certification (WQC).
Revisions resulting in changes to permitted impacts are proposed at two impact sites (Sites 4 and 5). The
changes to these sites are described below:
Site 4
The original permitted design at Site 4 included 0.03 acre of permanent fill impacts to wetland W3 and 181
linear feet of permanent stream channel impacts to stream SNH due to roadway fill. In the revised design,
the roadway fill slopes have been adjusted and a channel change is being proposed to stream SNH to avoid
potential impacts to the sanitary sewer that have may have occurred when installing the previously proposed
drainage. The revised design results in 95 linear feet of permanent stream channel impacts due to roadway
fill, 35 linear feet of permanent stream channel impacts due to channel change, and 10 linear feet of
temporary stream impacts. The revised design results in <0.01 acre of permanent wetland fill impacts due
to roadway fill, <0.01 acre of permanent wetland fill impacts due to the channel change, and 0.02 acre of
mechanized clearing in wetlands. The revised design at Site 4 results in a reduction in permanent stream
channel impacts of 51 linear feet and an increase in temporary stream impacts of 10 linear feet. Overall total
permanent wetland impacts to wetland W3 will remain 0.03 acre, however permanent wetland fill impacts
have been reduced by 0.02 acre and mechanized clearing in wetlands has been increased by 0.02 acre.
Site 5
The original permitted design at Site 5 included 473 linear of permanent stream impacts and 10 linear feet
of temporary stream impacts to stream S11. The previously authorized permanent impact included 54 linear
feet resulting from a 48” reinforced concrete pipe (RCP) extension and 419 linear feet resulting from a
channel change. The revised design includes 444 linear feet of permanent stream impacts and 10 linear feet
of temporary stream impacts resulting from a 48” RCP extension with a junction box. The design change
at Site 5 results in a reduction of 29 linear feet of permanent stream impacts and no change in temporary
stream impacts. The design change is being made to eliminate the concern for possible future roadway slope
stability issues, to reduce the amount of relocated channel needing regular maintenance and inspections on
the project, and to reduce the possibility of a noise wall in the future by retaining the existing berm.
Previously authorized permanent stream impacts for the entire project totaled 2,507 linear feet, which
included 1,131 linear of bank stabilization. Previously authorized temporary stream impacts totaled 1,347
linear feet. Previously authorized wetland impacts included 0.83 acre of permanent impacts (including 0.27
acre of mechanized clearing), no temporary impacts, and no hand clearing. The revised permanent stream
impacts total decreased from the previously authorized impact totals by 80 linear feet. Updated permanent
stream impacts for the entire project total 2,427 linear feet, which includes 1,131 linear feet of bank
stabilization. Temporary stream impacts will increase by 10 linear feet, totaling 1,357 linear feet. Wetland
impact totals did not change and are still 0.83 acre of permanent impacts (now including 0.29 acre of
mechanized clearing), no temporary impact, and no hand clearing.
Please see the enclosed revised permit drawings and roadway plans where drainage revisions resulted in
changes to permitted impacts. The revised Wetland Impact Summary Table is also attached.
Revised Compensatory Mitigation
The North Carolina Division of Mitigation Services (NCDMS) previously provided compensatory
mitigation for 1,376 linear of permanent stream impacts and 0.83 acre of permanent riparian wetland
impacts, as referenced in the December 18, 2019 GP 31 issued permit from the United States Army Corps
of Engineers (USACE) and the December 2, 2019 401 WQC from NCDWR.
Of the revised permanent stream impacts totaling 2,427 linear feet for this modification, 1,131 linear feet
are the result of bank stabilization and therefore do not require mitigation from USACE. Therefore, a total
of 1,296 linear feet of permanent stream impacts will require mitigation based on this modification, which
is a decrease of 80 linear feet as compared to the previously approved December 19, 2019 GP 31 issued
permit. NCDWR would require a total of 444 linear feet of mitigation, which is 29 linear feet less than the
previously approved amount of mitigation required by NCDWR (stream SNH at Site 4 is intermittent
therefore NCDWR does not require mitigation). This amount is less than the mitigation required by
USACE. There are no additional permanent wetland impacts, therefore no additional wetland mitigation is
required.
The North Carolina Department of Transportation was issued a Clean Water Act Section 404 Regional
General Permit 198200031 (GP 31) form the USACE on December 18, 2019 for the above-referenced
project. The project is still under construction and is not expected to be completed prior to April 30, 2020.
Therefore, NCDOT requests renewal of the permit under Regional General Permit SAW-2019-02350 (RGP
50).
NCDOT was also issued a Section 401 Water Quality Certification No. 4135 from NCDWR on December
2, 2019. Therefore, a renewal of the NCDWR Section 401 WQC will also be needed.
No changes have occurred to special commitments for this project.
NCDOT requests to modify and renew the permit for this project. Application is hereby made for
modification and renewal of the USACE 404 permit and the 401 WQC from NCDWR. We have provided
a method of debiting $570.00 to be submitted to the NCDWR for processing the WQC renewal for I-5507,
as noted in the subject line of this application.
A copy of this permit application and its distribution list will be posted in the NCDOT website at
http://connect.ncdot.gov/resources/Environmental.
Thank you for your assistance with this project. If you have any questions or need additional
information, please contact Erin Cheely at either [e-mail] or [phone].
Sincerely,
Philip S. Harris III, P.E., C.P.M.
Environmental Analysis Unit Head
cc:
NCDOT Permit Application Standard Distribution List
Hand Existing Existing
Permanent Temp. Excavation Mechanized Clearing Permanent Temp. Channel Channel Natural
Site Station Structure Fill In Fill In in Clearing in SW SW Impacts Impacts Stream
No.(From/To)Size / Type Wetlands Wetlands Wetlands in Wetlands Wetlands impacts impacts Permanent Temp.Design
(ac)(ac)(ac)(ac)(ac)(ac)(ac)(ft)(ft)(ft)
1 110+50 -L- RT Extend Existing 48" RCP < 0.01 28
1 110+50 -L- RT Bank Stabilization < 0.01 < 0.01 18 13
2 129+00 - 130+00 -L- LT Roadway Fill 0.08 0.02
2A 128+50 -L- RT Bank Stabilization < 0.01 < 0.01 11 20
3 132+00 -L- LT Extend 4 @ 10'x8' RCBC 0.03 52
3 132+00 LT Bank Stabilization 0.02 < 0.01 70 16
3 132+00 LT Culvert Construction Activities 0.03
4 132+00 - 134+00 -L- LT Roadway Fill < 0.01 0.02 < 0.01 95
4 132+00 - 134+00 -L- LT Channel Change < 0.01 < 0.01 < 0.01 35 10
5 137+40 - 142+25 -L- LT Extend 48" RCP with Junction Box 0.05 < 0.01 444 10
6 293+50 -L-Bank Stabilization < 0.01 < 0.01 48 10
7 294+00 - 301+00 -L- LT Rock Plating 0.07 680
8 298+00 -L- LT Concrete Energy Dissipator < 0.01 7
8 298+00 -L- LT Bank Stabilization < 0.01 10
9A 302+00 - 308+50 LT Roadway Fill 0.05 0.05
9B 309+50 -L- LT Roadway Fill 0.07 0.07
10 309+50 -L- LT Bank Stabilization at Temp. Bridge 0.01 0.01 65
11 343+00 -L-Bank Stabilization at Temp. Bridge 0.03 0.05 157
11 343+00 -L-Drill Shaft Installation 0.05
12 344+50 - 346+50 -L- RT Roadway Fill 0.13 < 0.01
13 360+00 -L- LT Bank Stabilization < 0.01 < 0.01 8 20
13 360+00 -L- RT Extend 3@ 9'x9' RCBC 0.01 49
13 360+50 -L- RT Bank Stabilization < 0.01 < 0.01 38 20
13 360+50 -L- RT Culvert Construction Activities < 0.01
TOTALS*:0.33 0.17 0.18 0.25 1135 799 0
*Rounded totals are sum of actual impacts
NOTES:
Revised 2018 Feb SHEET 112 OF 115
At Sites 1, 3, 5, and 13, the existing culvert is not buried, therefore the culvert extension will not be buried. The bottom elevation of the extended culvert will match the elevation of the existing stream bed.
At Site 1, <0.01 ac (18 lf) of temporary impacts due to construction activities are included within the bank stabilization impacts.
At Site 3, 0.02 ac (70 lf) of temporary impacts due to construction activities are included within the bank stabilization impacts.
At Site 10, <0.01 ac (30 lf) of temporary impacts due to the temporary bridge are included within the bank stabilization impacts.
At Site 11, 0.03 ac (122 lf) of temporary impacts due to the temporary bridge and installation of the drilled shaft are included within the bank stabilization impacts.
At Site 13, <0.01 ac (38 lf) of temporary impacts due to construction activities are included within the bank stabilization impacts.
WETLAND AND SURACE WATER IMPACTS SUMMARY
WETLAND IMPACTS SURFACE WATER IMPACTS
MECKLENBURG
TIP NO. I-5507
WBS NO. 43609.3.2
NC DEPARTMENT OF TRANSPORTATION
DIVISION OF HIGHWAYS
07/20/20
Hand Existing Existing
Permanent Temp. Excavation Mechanized Clearing Permanent Temp. Channel Channel Natural
Site Station Structure Fill In Fill In in Clearing in SW SW Impacts Impacts Stream
No.(From/To)Size / Type Wetlands Wetlands Wetlands in Wetlands Wetlands impacts impacts Permanent Temp.Design
(ac)(ac)(ac)(ac)(ac)(ac)(ac)(ft)(ft)(ft)
42 894+00/895+70 -L-Roadway Fill 0.03
42 894+00/895+70 -L- RT Extend 42" RCP 0.02 105
42 894+00/895+70 -L- RT Channel Change < 0.01 < 0.01 20 12
42 894+00/895+70 -L- LT Bank Stabilization < 0.01 20
43 18+60 -Y19RPC- RT Bank Stabilization < 0.01 < 0.01 30 10
44 28+50 -Y2-Extend 3 @ 8'x9' RCBC < 0.01 26
44 28+50 -Y2-Bank Stabilization < 0.01 < 0.01 28 19
44 28+50 -Y2-Culvert Construction Activities < 0.01
SHEET 1 SUBTOTALS*0.33 0.17 0.18 0.25 1135 799
SHEET 2 SUBTOTALS*0.11 0.04 0.15 0.04 638 181
SHEET 3 SUBTOTALS*0.07 0.07 0.05 0.04 425 336
TOTALS*:0.54 0.29 0.43 0.33 2427 1357 0
*Rounded totals are sum of actual impacts
NOTES:
Revised 2018 Feb SHEET 115 OF 115
At Sites 42 and 44, the existing culvert is not buried, therefore the culvert extension will not be buried. The bottom elevation of the
extended culvert will match the elevation of the existing stream bed.
At Site 42, <0.01 ac (20 lf) of temporary impacts due to construction activities are included within the bank stabilization impacts.
At Site 44, <0.01 ac (28 lf) of temporary impacts due to construction activities are included within the bank stabilization impacts.
WETLAND AND SURACE WATER IMPACTS SUMMARY
WETLAND IMPACTS SURFACE WATER IMPACTS
MECKLENBURG
TIP NO. I-5507
WBS NO. 43609.3.2
NC DEPARTMENT OF TRANSPORTATION
DIVISION OF HIGHWAYS
07/20/20
Revised July 2020
Revised July 2020