20040275 Ver 3_Information Letter_20100916

STATE OF NORTH CAROLINA ?t?,- SFr 6' 1 ?D
DEPARTMENT OF TRANSPORTATION" v4A -44JR??oio
BEVERLY EAVES PERDUE EUA..CONTI, JR.
GOVERNOR! ARY
September 13, 2010
US Army Corps of Engineers
Raleigh Regulatory Field Office
3331 Heritage Trade Dr., Suite 105
Wake Forest, NC 27587
Attention: Mr. John Thomas
NCDOT Coordinator, Division 9
C> c).- 5
Subject: Supplemental Information for the Application for a Modification to Section 404
Individual Permit and Individual Section 401 Water Quality Certification for
reconstruction and widening of I-85 from north of SR 2120 (Long Ferry Road) in
Rowan County to south of NC 150 in Davidson County. Federal Aid Project No.
NHFIMF-85-3(197)81, W13S 34156.3.GV3, Division 9, TIP No. I-2304AC.
Reference: Individual 404 Permit issued December 16, 2004, USACE Action ID 1998-21203
Individual 401 Certification No. 3455 issued March 19, 2004
Individual 401 Certification No. 3455 Modification issued November 22, 2004
Individual 404 Permit Extension issued April 1, 2009
Dear Sir:
The North Carolina Department of Transportation (NCDOT) is providing the following supplemental
information associated with the application for a modification to the existing Individual Section 404
Permit and 401 Certification for Permit Impact Site 2 of the above referenced project. The
information provided herein was requested at the agency/contractor meeting on September 2, 2010.
This letter includes both clarification and documentation on hand clearing mitigation requirements,
proposed mitigation site, and stormwater measures associated with Site 2 (proposed work bridge and
I-85 bridge over the Yadkin River). Enclosed with this letter is a copy of the onsite restoration plan,
stormwater treatment information, a revised wetland permit impact summary table, and permit
drawings 5A, 7A, 9A, and 913 of 11.
Hand Clearine
Site 2 requires 6.59 acres of hand clearing to construct the work bridge and bridge over the Yadkin
River. Hand clearing impacts were not included in the original permit application (2004). After
discussions with the agencies and NCDOT, no mitigation will be required for hand clearing.
MAILING ADDRESS: LOCATION:
NC DEPARTMENT OF TRANSPORTATION TELEPHONE: [phone] ATLANTIC AVE.
PROJECT DEVELOPMENT AND ENVIRONMENTAL ANALYSIS FAX: [phone]! SUITE 116
NATURAL ENVIRONMENT UNIT 919-431-2002 RALEIGH NC 27604
1598 MAIL SERVICE CENTER
RALEIGH NC 276 9 9-1 59 8 WEBSITE: WWW.NCDOTORG

The limits of construction for the I-85 bridge corridor across the Yadkin River will be cleared of
'standing timber: Hand clearing will be performed using a track mounted feller-buncher timber
harvester `working.on timber mats. The mats will distribute the loading of the machine to the ground
to minimize compaction and rutting of the soil in the permit areas. Trees will be cut off of the stump
and removed.' The stumps will be left in place in the cleared areas. Grubbing will only occur in the
area where the drilled shafts will be constructed for the permanent structure and steel pile will be
driven for the temporary work bridge (trestle) foundations. The trees and stumps will be removed
from the corridor by using a track mounted timber loader which will operate on timber mats to
forward the debris to areas outside of the permit area that can accommodate rubber tired equipment.
The rubber tired equipment will move the debris to an area for loading and removal from the site.
BEdge`C ristructionl_? t.1
The trestle pile will be driven using a pile hammer with the steel pipe pile inside of a ring of turbidity
curtain. Each pile will be driven separately with the curtain containing only the pile. The curtain
ring will be moved and setup at each new location before the pile is driven. The drilled shaft
construction will be performed from the trestle. The turbidity curtain will be placed around the
perimeter of the entire bent of drilled shafts and driven piles for the drilled shaft template. The
permanent steel shaft casing will be driven. The soil will be excavated from the inside of the casing
and placed into steel boxes for removal from the trestle to a disposal area.
Mitigation
On-site mitigation is associated with the project and involves removal of the existing I-85 bridge over
the Yadkin River as well as removal of existing roadway fill (causeway) in the floodplain of the river.
This mitigation was detailed in the "Restoration Plan for Swamp Hardwood Restoration" which is
included in this submittal. The total amount of riparian wetland mitigation described in the
restoration plan is 2.74 acres. The current design of Section AC shows 0.07 acre of permanent fill
and 0.14 acres of mechanized clearing!in the wetland for a total of 0.21 acres of permanent riparian
wetland impacts at the bridge location. Mitigation for Site 2 will be debited at a 1:1 ratio from the
2.74 acres of on sit riparian wetland restoration described above leaving a balance of 2.53 acres. The
mitigation request from EEP for 0.42 acres will be rescinded.
Stormwater
Stormwater management has been incorporated across the project to the greatest extent practical.
The project area does not lie within a water supply watershed, buffered basin, or an area with local
buffer requirements. The area does contain a 303(d) listed stream (Yadkin River) and the sediment
and erosion control on the project was designed for the 25 year storm. The Yadkin River will not
have any direct discharges from the highway and the bridge will have an enclosed deck drainage
system that will be discharged to dry detention basins on the south end of the bridge (see attached
drawing). These dry detention basins collect both waters from the bridge as well as portions of the L
line for treatment. A dry detention basin is also provided on the north end of the bridge to provide
treatment for the L line in that area. Grass swale treatment is also provided in series with the dry
detention basins (grass swale comps associated with Site 2 are included). Additional measures have
been incorporated across the project such as ditches which receive grass swale credit and preformed
scour holes. Areas in which stormwater devices have not been provided were due to the topography
not lending itself to incorporation of the devices or NCDOT right of way was not sufficient for
inclusion. A more detailed description of the stormwater devices proposed for the remainder of the
project will be included in the forthcoming permit modification for the remaining permit impact sites.
Thank you for your assistance with this project. If you have any questions or need additional
information, please contact Sara Easterly at [e-mail] or (919) 4311605.
Sincerely,
ecu Gregory . Thorpe, Ph.D., Manager
Project Development and Environmental Analysis Branch
wlattachment
Mr. Brian Wrenn, NCDWQ (5 Copies)
Ms. Marla Chambers, NCWRC
Ms. Jennifer Derby, USEPA
Ms. Marella Buncick, USFWS
W/o attachment (see website for attachments)
Dr. David Chang, P.E., Hydraulics
Mr. Mark Staley, Roadside Environmental
Mr. Dewayne Sykes, P.E., Utilities Unit
Mr. Greg Perfetti, P.E., Structure Design
Mr. S.P. Ivey, P.E., Division Engineer
Mr. Kent Boyer, DEO
Mr. Jay Bennett, P.E., Roadway Design
Mr. Majed Alghandour, P. E., Programming and TIP
Mr. Art McMillan, P.E., Highway Design
Mr. Scott McLendon, USACE, Wilmington
Ms. Beth Harmon, EEP
Mr. Phillip Ayscue, NCDOT External Audit Branch
Mr. Drew Jorner, P.E., Human Environment Unit Head
Mr. Clarence W. Coleman, P.E., FHWA
Mr. Eric Midkiff, P.E., PDEA
3
oer-lJ_euuv u7•oe rvwui Une-urve 717 'flb 1?d1 !'. d?
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Restoration Plan for Swamp Hardwoods Wetlands
At Existing Bridge Causeway of the I-85 Yadkin River
In Rowan County .
I-2304AA
July 12, 2004
The North Carolina Department of Transportation (NCDOT) will perform on-site
mitigation for riverine bottomland hardwood swamp at the Interstate 85 (I-85) overpass
of the Yadkin River in Rowan County. This mitigation site occurs within Transportation
Improvement Program (TIP) project I-2304AA. NCDOT will remove approximately
2.74 acres of existing bridge causeway fill in order to restore the underlying disturbed
wetlands.
WETLAND MITIGATION GRADING
The design of the wetland mitigation area shall consist of undercut excavation of existing
roadway fill down to the alluvium soil layer. If the alluvium soil layer is encountered at
an elevation above the adjacent existing wetland, excavation shall continue until the
elevation matches the existing, adjacent wetland elevation. If the alluvium soil layer is
encountered below the adjacent existing wetland elevation, a silty loam, sandy loam or
muck shall be used to backfill these areas to match the existing wetland elevation. All
excavated areas shall be ripped prior to placement of any backfill material and before
planting of the site.
The NCDOT Project Development and Environmental Analysis, Office of Natural
Environment shall approve the design of the restoration site prior to construction. The
Office of Natural Environment shall be contacted to provide construction oversight to
ensure that the wetland mitigation area is constructed appropriately.
VEGETATION PLANTING
The restoration site will be planted with the following wetland tree species: sycamore
(Plaranus occidentalis), river birch (Beiula nlgra), green ash (Fraxinus pennsylvanica),
American elm (Winus americana), black gum (Nyssa sylvatiea), and swamp chestnut oak
(Quercus mlchauzii).
The hardwood tree species utilized shall be 18"-30" in size and shall be bare root
seedlings that are at least one growing season in age. Planting density shall be, 680
seedlings per acre, which equates to a plant spacing of 8 feet on-center.
MONITORING:
Upon successful completion of construction, NCDOT will document the following
monitoring activities utilizing an annual-report for the site, which will be distributed to
the regulatory agencies.
SEP-15-2004 09:56 NCDOT OHE-ONE
HYDROLOGIC MONITORING
919 715 1501 P. O3.03
While no specific hydrological monitoring is proposed for this restoration site, elevations
of restored areas will be verified during construction to match adjacent wetland
elevations.
VEGETATION SUCCESS CRITERIA
NCDOT shall monitor the restoration site utilizing two (2) fifty feet by fifty feet (50' x
50') monitoring plots that will be established upon completion of the site grading and
planting.
NCDOT shall monitor the site for a minimum of five years or until the site is deemed
successful. A 320 stems per acre survival criterion for planted seedlings will be used to
determine success for the first three years. The required survival criterion will decrease
by 10% each year after the third year of vegetation monitoring (i.e., for an expected 290
stems per acre for year 4, and 260 stems per acre for year 5).
TOTPL P.03
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