19930163 Ver 1_COMPLETE FILE_20100726

State of North Carolina
Department of Environment,
617
Health and Natural Resources 40
Division of Environmental Management ,
James B. Hunt, Jr., Governor r - - V , - ;
Jongt0an B. Howes, Secretary
A, Preston Howard, Jr., P.E., Director
June 17, 1993
Mr. Barney O'Quinn
Planning and Environmental Branch
N.C. Department of Highways
Post Office Box 25201
Raleigh, N.C. 27611-5201
Dear Mr. O'Quinn:
Subject: Proposed fill in Wetlands or Waters
Certification Modification, SR 1568
Onslow County
DEM Project # 93303
Upon review of your request for 401 Water Quality Certification to place fill material in
an additional 0.5 acres of wetlands or waters which are tributary to New River for Certification
modification for utility line relocation located in Onslow County, as described in your submittal
dated 11 April 1993, we have determined that the proposed fill can be covered by a
modification to Water Quality Certification No. 2744 issued June 17, 1993.
If you have any questions, please contact John Dorney at 919-733-1786.
Sincerely,
Preston Howard, Jr. P.E.
92303.Itr
Attachment
cc: Wilmington District Corps of Engineers
Corps of Engineers Wilmington Field Office
Wilmington DEM Regional Office
Mr. John Dorney
Central Files
P.O. Box 29535, Raleigh, North Carolina 27626-0535 Telephone [phone] FAX [phone]
An Equal Opportunity Affirmative Action Employer 50% recycled/ 1 0% post-consumer paper
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/ Signed
N.C. Dept. of Environment, Health, and Natural Resources
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?.ST?TZ
STATE OF NORTH CAROLINA
DEPARTMENT OF TRANSPORTATION
JAMES B. HUNT. JR. DIVISION OF HIGHWAYS
GOVERNOR P.O. BOX 25201, RALEIGH, N.C. 27611-5201
April 11, 1993
Division of Coastal Management
N.C. Department of Environment, Health
and Natural Resources
P.O. Box 27687
Raleigh, North Carolina 27611
ATTENTION: Mr. John Parker
Dear Sir:
TVETLAWS GROUP
VIATER OUALITY SECTICII
SAM HUNT
SECRETARY

SUBJECT: Onslow County, Relocation of approximately 1.3
miles of SR 1568, beginning 2.8 miles northeast
of NC 210 and ending approximately 1.2 miles
southwest of the New River Inlet, State Project
9.8034903, TIP No. R-2801.
Please reference the Coastal Area Management Act permit
(CAMA permit 124-92) for the subject project, issued to the
North Carolina Department of Transportation on December 10,
1992. Condition 10 of this permit stated that "Any necessary
relocation of any utility lines must be by modification of
this permit."
With this condition in mind, members of NCDOT's Design
and Planning and Environmental Branches met with Mr. Bob
Stroud (DCM-Wilmington) and Mr. Jeff Richter (COE-Wilmington)
on February 8 to discuss utility line relocation options in
the two areas of coastal wetlands. At this meeting, NCDOT
proposed to place a 10" pvc sewer line on the ocean side and
a 12" pvc water line on the sound side of the two bridges.
To place these utility lines, NCDOT proposed to excavate a 4
foot wide, three foot deep ditch on either side of each
bridge. A five foot wide work area would be required on
either side of the excavated ditches, with an eight foot wide
material storage area provided on one side of each ditch (see
Figure la). These ditches would be 25' from the centerline
of the bridges. This alternative would lead to the temporary
excavation of approximately 5000 square feet of coastal
wetlands, with the temporary disturbance of an additional

f .
20500 square feet disturbed by construction activities.
After completion of the utility line relocation, the ditches
would be back filled to original ground elevation, and
natural revegetation allowed to take place. The estimated
cost of this proposal is $72,800.
At this meeting, NCDOT was asked to examine some
alternative designs that could lead to a minimization or
avoidance of wetland impacts, such as utilizing a pier system
for the utility lines, utilizing directional borings to avoid
wetland impacts, performing ditch excavations from the bridge
structures to avoid construction impacts to the marsh,
placing both utility lines in the same ditch, attaching the
lines to the bridge structure, and locating the lines beneath
the storm water control weirs planned for the sound side of
each bridge, thus eliminating the need for additional
excavation. NCDOT has examined these alternatives, and
offers the following comments on each option.
The alternative for attaching the lines to the bridge
structure was eliminated from consideration because NCDOT
design specifications will not allow for drilling into a
cored slab bridge.
The storm water control weirs will be made of driven
sheet pilings, and no excavation will be required to place
these structures. In order to place the utility lines in
this area, a four foot wide ditch with adjacent work areas
would still be required. Therefore, placing the utility
lines beneath or next to the weirs would not lead to a
reduction in wetland impacts.
By utilizing a pier system, wetland impacts could be
reduced to the areas where the piers would be placed (see
Figure lb), approximately 1800 square feet. This impact
would be permanent. The type of pipes required for this
option, restrained joint ductile iron, would require periodic
painting and maintenance, leading to future marsh impacts
associated with this option. The cost of this alternative
has been estimated at $186,750. Due to the increased cost
and maintenance requirements, as well as the permanent loss`
of 1800 square feet of wetland habitat, NCDOT does not
believe that this option is currently a practicable
alternative.
By utilizing a directional boring system, whereby
borings would be done from outside the wetlands limits and
steel encased pipes jacked in below the wetlands, no coastal
wetlands be impacted (see Figure lc). However, this method
would be hard to implement because long bores are difficult
to keep on alignment, and a well system would be needed to
keep the boring holes dry. This method would also be the

most expensive to construct, costing an estimated $221,250.
Because of the increased cost and engineering difficulties
associated with this alternative, NCDOT wishes to pursue
other options.
NCDOT bridge design engineers have stated that work
could be performed off of the bridge if absolutely necessary,
but this option is highly undesirable for several reasons.
If the excavation were to be done off of the bridge
structures, special equipment would be needed to perform the
excavation, and dump trucks would be required to store the
material. Additionally, there are concerns over possible
damage to grout in the longitudinal joints between the cored
slab units, possible damage to the parapet reinforcing steel
projecting from the exterior cored slab units and possible
damage to the integrity of the sealant in the bridge
expansion joints. It must also be noted that the clamshell
dredge needed to do the excavation from the bridges would not
be able to excavate a neat four foot wide trench, as can be
done with a backhoe. It is more likely that the trench would
be 8 to 10 feet wide (see Figure ld). Therefore, the area of
temporary excavation would be approximately 11,000 square
feet. This method would cost an estimated $101,400, although
repair of any damage to the bridge would increase this value.
This method would take the longest to construct, requiring
that the relocation not begin until after completion of the
bridges structures. NCDOT does not wish to pursue this
option due to the engineering difficulties and possibility of
damage to the bridge structures.
Another option examined was to place both the water and
sewer lines on the same side of the structure. Ductile iron
pipe would be necessary and the sewer line would be required
to be a minimum of 18 inches deeper than the water line (see
Figure le). Permission from the Division of Environmental
Management would also be necessary to place water and sewer
lines so close together. Because of the wet conditions of
the area, a deep trench would be difficult to build and
maintain. This method would cost an estimated $146,300 and
would lead to the temporary excavation of approximately 700,0
square feet of wetland, with an additional 9300 square feet
disturbed by the construction activities. Due to the
increased cost and limited savings in wetland impact, NCDOT
does not propose this alternative.
With the above stated information in mind, NCDOT still
believes that our original proposal, to place a 10" pvc sewer
line on the ocean side and a 12" pvc water line on the sound
side of the two bridges, as shown in Figure la, and to
perform the excavations from within the marsh, is the most
feasible available alternative. We are therefore requesting
that the permit be modified to allow for the authorization of
the utility line relocation, utilizing our original proposal
as described on the first page of this correspondence.
A check for $50 to cover the processing of this application
will be forwarded to your office within the next week. By
copy of this letter, we are also requesting modification of
the Section 404 permit issued by the U.S. Army Corps of
Engineers and the 401 Water Quality Certification from the
N.C. Division of Environmental Management.
If you have any questions concerning this issue, please
contact Mr. Doug Huggett at [phone].
Si cerely, "1 1. B. J. 0' ui .E.
Ass ant Branch Manager
Planning and Environmental Branch
cc: Mr. Bob Stroud, DCM-Wilmington
District Engineer, COE
Mr. John Dorney, DEM, DEHNR
Mr. Kelly Barger, PE, Project Management Unit
Mr. Don Morton, PE, Highway Design Branch
Mr. A.L. Hankins, PE, Hydraulics
Mr. John Smith, PE, Structure Design
Mr. W.D. Johnson, Roadside Environmental
Mr. D.J. Bowers, P.E., Division 3 Engineer
Onslow County, Relocation of approximately 1.3
miles of SR 1568•, beginning 2.8 miles northeast
of NC 210 and ending approximately 1.2 miles
southwest of the New River Inlet
TIP No. R-2801
MATEkuI-
5Tv RA 6L
Wank WORK !
AREA /AREA
3?
Figure la
Open Cut, Both Sides of Structure
Typical Section
?CONCRUr, CRAOIC
PILES
Figure lb
Pier System
Typical Section
. 1.O q o 4o 4o 4. 4t, jo 4o' 7o u'
r
% io'
EDGE of wEzLAmo$ EDGE of WETIAMOS-?
3STEEL ENCASEMENT pIpE
BY BORE ? TACK
Figure lc
Directional Boring
Typical Section
'7.
Figure ld
Excavation from Bridge Structure
Typical Section
jAATCR%4l
MATERIAL W, K STORAGQ
1
STo RAGE AREA I
WORK I I, rw
AREA 11 r ? 00 00100 1 , ). f +'
r ?
30'
O
je. 36' a'
Figure le
Both Lines on Same Side of Bridge
Typical Section
STATE
Zr
State of North Carolina
Department of Environment, Health, and Natural Resources
5772 Noah Salisbury Saeec • Raleigh, North Carolina 27604
James B. Hunt, Jr., Governor
March 25, 1993
Jonathan B. Howes, Secretary
Mr. Barney O'Quinn
Planning and Environmental Branch.
N.C. Department of Transportation
Post Office Box 25201
Raleigh, North Carolina 27611-5201
Dear Mr. O'Quinn:
Subject: Proposed Fill in Wetlands or Waters
Modification of earlier certification - additional fill
Onslow County
DEM Project # 93163, COE # 199201037, DCM# 124-92
Upon review of your request for Water Quality Certification
to place fill material in 0.055 acres of wetlands or waters which
are tributary to New River Inlet for road improvement located at
SR 1568 in Onslow County, we have determined that the proposed
fill can be covered by General Water Quality Certification No.
2744 issued June 16, 1992. Additional conditions-are'that 1) -
excavated material should be removed from wetland areas and 2)
fresh concrete shall not come into direct contact with surface
waters.
If you have any questions, please contact John Dorney at
919/733-1786.
Sincerely,
pre:ston Howard, Jr. P. E.
1
APH:JD l
Attachment
cc: Wilmington District Corps of Engineers
Corps of Engineers Wilmington Field-Office
Wilmington DEM Regional Office
Mr. John Dorney
Cenip. x:r6?i?aTtigt, North Carolina 27611-7687 Telephone 919-iJ3-:984 Fax.[phone]
An Equal opportunity Affirmative Aeon Employer

ME1J.0PAND UM PRINT NAMES:
Reviewer
TO: John Dorney I•IO Supv.
Planning Branch DATE: Zzrta l? Q}
SUBJECT: GJETLAND STAFF REPORT AND RECOI iI IET]DJITI OT?S
4T BEACH ITEM MUST BE ANSI•IERED (IJSE N/A FOR NOT APPLICABLE) +
PER4IT YR: 93 PERMIT NO:
APPLICANT NAME: NC DOT - MODIFY SR
PROJECT TYPE: BRIDGE BENTS
COE_4 :
RCD FROM CDA: DOT
REG OFFICE: IJIRO
rr rr
STREAM-CLASS: ?11'021V)
IVJL_II'IPACT? :0N
D-Orj?
11L-REQUESTED:
WL_S>CORE H; ) :
HYDRO_CNECT? : Y 'N
I4ITIGATION_TYPE: N/?
0000163 COUNTY:
1568 PROJECT
PERMIT TYPE:
DOT } .
DATE _FRr'I_CDA :
RIVER-AND-SUB-BASIN-j:
IS -JETLAND RATING SHEET ATTACHED?: Y
RECOMMENDATION (Circle One : ISSUI ISSUE/COND DEITY
COMMENTS : /s'IDniFIC'?4T10?/ OF /,(.?(` ?27?? /SSI?E?- /e, JzJ.-IC- . 199,
P?©JECi 9241??r %fl` A?1?n?Ftch' /Qn% ?? xle , 41J kml-lomz,
2 !;? S L4Rt/7'tlg.? L/_ /N 6,e-ILY7S
'Tv /nJ?/Zc'f)Sf; T/dE ?12F of 1"11?R-?tOfa? ???i ?S?F?o,ers /i? ror??): ?f1,t?I?J
cc: Regional Off icu
Central Files
STID INDEX NO:
I•JL_`'YPE : 1ri'?
I-JL_ACR_E S`T'? : Y OT
WATER IMPACTED I3Y FILL? : qN
i-,IITIGATI0I'1? : Y NI
141TIGATION-SIZE: i
p LMM 9d[
1,tA,R 2 33 19,93
L
WETL,,',NDS GROUP
WATER QUALITY SECTION
Vli- 4011t 06/41/ AC-6111&0,;?-
r1C fIQ?1/. %Jl15 ?FFr?tt _JL?Ll1-df1°
A1?91- 815
?135't?tarY / ? rp Sri/iE-,e ?J-?tJC' ??/d IF S,
OIvTSLi>GI
CAI IA
02/26/93
d3 -.OLD -O t

P /63
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STATE OF NORT}-i CAROLINA
DEPARTMENT OF TRANSPORTATION
JAM PS B. HUNT. )R.
Gowmoit
DIVISION OF HIGHWAYS
11.0. 1UX 25201. M11161 1. N.C. 27611-5201
SAM I IUNT
SIC RI TARY
February 23, 1993
Division of Coastal Management
N.C. Department of Environment, Health
and Natural Resources
P.O. Box 27687
Raleigh, North Carolina 27611
ATTENTION: Mr. John Parker
Dear Sir:
if FEB 2 6 1993
SUBJECT: Onslow County, Relocation of approximately 1.3
miles of SR 1568, beginning 2.8 miles northeast
of NC 210 and ending approximately 1.2 miles
southwest of the New River Inlet, State Project
9.8034903, TIP No. R-2801.
Please reference the Coastal Area Management Act permit
(CAMA permit 124-92) for the subject project, issued to the
North Carolina Department of Transportation on December 10,
1992. This project included two bridges over areas of
coastal marsh.
After final project design plans were completed, it was
determined that additional marsh excavation would be required
to build the forms needed to construct the bent caps of the
two bridges. This excavation will be necessary due to the
similarity of the elevations of the marsh and the bridge. It
would be impractical to raise the elevations of the two
bridges, as this would require project redesign and would
also increase the construction footprint and right of way
claims on either side of the bridges due to increased fill
slopes.
The actual bent caps are 3514"x4'011. To be able to
build the forms needed to pour the caps, an additional 1'6"
will need to be excavated on all sides of the cap. This will
lead to an necessary excavation of 3814"x7'0" for each cap.
The depth of the proposed cut will vary depending on the
marsh elevation, but there must be two feet between the
?,aVr

a
bottom of the cap and the bottom limit of the excavation.
The depth of cut and excavation volumes are shown on the
enclosed foundation excavation quantity work sheets.
After the concrete bent caps have cured, the forms will
be removed. Because several of the bent caps will extend
below natural ground elevation, it is not proposed to refill
the areas of excavation. It is expected that, while
vegetative species will likely not recolonize these areas,
the depressions should yield healthy benthic invertebrate
communities.
The North Carolina Department of Transportation requests
that the CAMA permit be modified to allow for the extra
excavation underneath the bent caps. Included for your
information are a set of drawings showing the areas of
excavation for both bridges, as well as a set of foundation
excavation quantity work sheets. A check for $50 to cover
the processing of this application will be forwarded to your
office within the next week. By copy of this letter, we are
also requesting modification of the Section 404 permit issued
by the U.S. Army Corps of Engineers and the 401 Water Quality
Certification from the N.C. Division of Environmental
Management.
A second permit modification request, dealing with
utility line placement through the marshes, will be submitted
within the next few weeks. NCDOT is currently studying
options regarding this issue, and a final decision on our
proposed course of action is due within the next two to three
weeks.
If you have any questions concerning this issue, please
contact Mr. Doug Huggett at [phone].
Sincerely,
qB-. O'Qui P.E.
Assistant- ranch Manager
Planning and Environmental Branch
cc: Mr. Bob Stroud, DCM-Wilmington
District Engineer, COE
Mr. John Dorney, DEM, DEHNR
Mr. Kelly Barger, PE, Project Management Unit
Mr. Don Morton, PE, Highway Design Branch
Mr. A.L. Hankins, PE, Hydraulics
Mr. John Smith, PE, Structure Design
Mr. W.D. Johnson, Roadside Environmental
Mr. D.J. Bowers, P.E., Division 3 Engineer

' s ? IS6 ?
Top scr; f Pcc4c,?
Plan view 4r eciG? e, C-c wiur-7
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Foundation Excavation Quantities
Bridge at Station 176 (Bridge nearest to NC 210)
Bent # Natural Ground Depth of Cut Volume
Elevation (CY)
1 4.5 4.5 44.7
2 1.5 1.5 14.9
3 0.5 0.5 5.0
4 2.0 2.0 19.9
5 3.0 3.0 29.8
6 3.5 3.5 34.8
7 3.0 3.0 29.8
8 2.0 2.0 19.9
Bridge at Station 160 (Bridge nearest New River Inlet)
Bent # = Natural Ground Depth of Cut Volume
Elevation (CY)
1 2.5 2.5 24.8
2 2.0 2.0 19.9
3 1.5 1.5 14.9
4 1.5 1.5 14.9
5 1.5 1.5 14.9
6 1.5 1.5 14.9
7 2.0 2.0 19.9
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DEPARTMENT OF THE ARMY
WILMINGTON DISTRICT. :ORPS 3F =:`dGii`1c=?
a ``y ^^J ,r 1 IVIU INGT: J. IG r,
marcn
Regulatory Branch
Action IDo. 199201037 and State Permit No. 124-?2
Mr. John Parker
Division of Coastal Management
North Carolina Department of Environment,
Health and Natural Resources
Post Office Box 27687
Raleigh, North Carolina 27611-7687
Dear Mr. Parker:
Reference the State/Department of the Army permit, issued to the North
Carolina Department of Transportation (NCDOT), Division of Highways, to place
fill material in 0.6 acre of wetlands adjacent to the Atlantic Ocean
associated with relocation of 1.3 miles of S.R. 1568, southwest of New River
Inlet, North Topsail Beach, Onslow County, North Carolina, State Project
9.8034903, TIP No. R-2801. Also, reference NCDOT's letter of February 23,
1993, whereby they requested a permit modification to enlarge excavations for
the bridge caps by 1 foot and 6 inches on all sides.
We have reviewed this proposed change, and we do not consider it to be
significant. Therefore, we have no objections to modification of the
authorization provided all conditions of State Permit No. 124-92, issued
December 10, 1992, remain valid and in full effect.
Questions or comments may be addressed to Mr. Jeffrey Richter, Wilmington
Field Office, Regulatory Branch, telephone [phone].
Sincerely,
G. Wayne Wright
Chief, Regulatory Branch
Copies Furnished:
?Xr. John Dorney
Water Quality Section
Division of Environmental
Management
North Carolina Department of
Environment, Health, and
Natural Resources
post office Box 27687
Raleigh, North Carolina 27611-7687
Mr. C. Robert Stroud, Jr.
Wilmington Regional office
North Carolina Division of
Coastal Management
127 Cardinal Drive Extension
Wilmington, North Carolina 28405-3845
S"'?
? 3r,63
IAMIS B. I IUNT. IR
Gov[RN01,
STATE OF NORTFI CAROLINA 1,1T+;=1t nl!„LI_TY ` _
DEPARTMENT OF TRANSPORTATION
DIVISION OF HIGHWAYS
P.O. BOX 25201, RALEIGH. N.C. 27611-5201
February 23, 1993
Division of Coastal Management
N.C. Department of Environment, Health
and Natural Resources
SAM HUNT
SLCR[ VARY
l?
I( ` A1
{
P.O. Box 27687 -_
Raleigh, North Carolina 27611 (- i F'7. ?'
TPT-RT-7
ATTENTION: Mr. John Parker ;
Dear Sir:
SUBJECT: Onslow County, Relocation of approximately','r,uER?!1? '?Y s,__. _..._
miles of SR 1568, beginning 2.8 miles northeast
of NC 210 and ending approximately 1.2 miles
southwest of the New River Inlet, State Project
9.8034903, TIP No. R-2801.
Please reference the Coastal Area Management Act permit
(CAMA permit 124-92) for the subject project, issued to the
North Carolina Department of Transportation on December 10,
1992. This project included two bridges over areas of
coastal marsh.
After final project design plans were completed, it was
determined that additional marsh excavation would be required
to build the forms needed to construct the bent caps of the
two bridges. This excavation will be necessary due to the
similarity of the elevations of the marsh and the bridge. It
would be impractical to raise the elevations of the two
bridges, as this would require project redesign and would
also increase the construction footprint and right of way
claims on either side of the bridges due to increased fill
slopes.
The actual bent caps are 35'41lx4'011. To be able to
build the forms needed to pour the caps, an additional 116"
will need to be excavated on all sides of the cap. This will
lead to an necessary excavation of 38'4"x7'0" for each cap.
The depth of the proposed cut will vary depending on the
marsh elevation, but there must be two feet between the

bottom of the cap and the bottom limit of the excavation.
The depth of cut and excavation volumes are shown on the
enclosed foundation excavation quantity work sheets.
After the concrete bent caps have cured, the forms will
be removed. Because several of the bent caps will extend
below natural ground elevation, it is not proposed to refill
the areas of excavation. It is expected that, while
vegetative species will likely not recolonize these areas,
the depressions should yield healthy benthic invertebrate
communities.
The North Carolina Department of Transportation requests
that the CAMA permit be modified to allow for the extra
excavation underneath the bent caps. Included for your
information are a set of drawings showing the areas of
excavation for both bridges, as well as a set of foundation
excavation quantity work sheets. A check for $50 to cover
the processing of this application will be forwarded to your
office within the next week. By copy of this letter, we are
also requesting modification of the Section 404 permit issued
by the U.S. Army Corps of Engineers and the 401 Water Quality
Certification from the N.C. Division of Environmental
Management.
A second permit modification request, dealing with
utility line placement through the marshes, will be submitted
within the next few weeks. NCDOT is currently studying
options regarding this issue, and a final decision on our
proposed course of action is due within the next two to three
weeks.
If you have any questions concerning this issue, please
contact Mr. Doug Huggett at [phone].
Sincerely,
qJ. O'Qui P.E.
Assistant ranch Manager
Planning and Environmental Branch
cc: Mr. Bob Stroud, DCM-Wilmington
District Engineer, COE
Mr. John Dorney, DEM, DEHNR
Mr. Kelly Barger, PE, Project Management Unit
Mr. Don Morton, PE, Highway Design Branch
Mr. A.L. Hankins, PE, Hydraulics
Mr. John Smith, PE, Structure Design
Mr. W.D. Johnson, Roadside Environmental
Mr. D.J. Bowers, P.E., Division 3 Engineer
N. C. DEPART31ENT OF TRANSPORTATION
DATE
TRANSMITTAL SLIP I
TO: REF. NO. OR ROOM, BLDG.
``--
?? c• ?bTl Y???SR4?1 C'C?1 ? ? ?
FROM: REF. NO. OR ROOM, BLDG.

ACTION
? NOTE AND FILE ? PER OUR CONVERSATION
? NOTE AND RETURN TO ME ? PER YOUR REQUEST
? RETURN WITH MORE DETAILS ? FOR YOUR APPROVAL
? NOTE AND SEE ME ABOUT THIS ? FOR YOUR INFORMATION
? PLEASE ANSWER ? FOR YOUR COMMENTS
? PREPARE REPLY FOR MY SIGNATURE ? SIGNATURE
? TAKE APPROPRIATE ACTION ? INVESTIGATE AND REPORT
COMMENTS:

STATE OF Nouvi CAROLINA
DEPARTMENT OF TRANSPORTATION
IAMLS Il. I I(INT. IR.
Govmwit
DIVISION OF HIGI WAYS
P.O. BOX 25201, RALLIGI I. N.C. 27611-5201
February 23, 1993
Division of Coastal Management
N.C. Department of Environment, Health
and Natural Resources
P.O. Box 27687
Raleigh, North Carolina 27611
ATTENTION: Mr. John Parker
Dear Sir:
?3/63
SAM HUN L
SICRLTARY
FEB
2 / 'ct
L)Si 1f;-,17
SUBJECT: Onslow County, Relocation of approximately 1.3
miles of SR 1568, beginning 2.8 miles northeast
of NC 210 and ending approximately 1.2 miles
southwest of the New River Inlet, State Project
9.8034903, TIP No. R-2801.
Please reference the Coastal Area Management Act permit
(CAMA permit 124-92) for the subject project, issued to the
North Carolina Department of Transportation on December 10,
1992. This project included two bridges over areas of
coastal marsh.
After final project design plans were completed, it was
determined that additional marsh excavation would be required
to build the forms needed to construct the bent caps of the
two bridges. This excavation will be necessary due to the
similarity of the elevations of the marsh and the bridge. It
would be impractical to raise the elevations of the two
bridges, as this would require project redesign and would
also increase the construction footprint and right of way
claims on either side of the bridges due to increased fill
slopes.
The actual bent caps are 3514"x4'0". To be able to
build the forms needed to pour the caps, an additional 116"
will need to be excavated on all sides of the cap. This will
lead to an necessary excavation of 38'4"x7'0" for each cap.
The depth of the proposed cut will vary depending on the
marsh elevation, but there must be two feet between the

bottom of the cap and the bottom limit of the excavation.
The depth of cut and excavation volumes are shown on the
enclosed foundation excavation quantity work sheets.
After the concrete bent caps have cured, the forms will
be removed. Because several of the bent caps will extend
below natural ground elevation, it is not proposed to refill
the areas of excavation. It is expected that, while
vegetative species will likely not recolonize these areas,
the depressions should yield healthy benthic invertebrate
communities.
The North Carolina Department of Transportation requests
that the CAMA permit be modified to allow for the extra
excavation underneath the bent caps. Included for your
information are a set of drawings showing the areas of
excavation for both bridges, as well as a set of foundation
excavation quantity work sheets. A check for $50 to cover
the processing of this application will be forwarded to your
office within the next week. By copy of this letter, we are
also requesting modification of the Section 404 permit issued
by the U.S. Army Corps of Engineers and the 401 Water Quality
Certification from the N.C. Division of Environmental
Management.
A second permit modification request, dealing with
utility line placement through the marshes, will be submitted
within the next few weeks. NCDOT is currently studying
options regarding this issue, and a final decision on our
proposed course of action is due within the next two to three
weeks.
If you have any questions concerning this issue, please
contact Mr. Doug Huggett at [phone].
Sincerely,
, ?i?---?
/ l?
B. J. O'Qui , P. E.
Assistant- ranch Manager
Planning and Environmental Branch
cc: Mr. Bob Stroud, DCM-Wilmington
District Engineer, COE,
,.Mr. John Dorney, DEM, DEHNR
Mr. Kelly Barger, PE, Project Management Unit
Mr. Don Morton, PE, Highway Design Branch
Mr. A.L. Hankins, PE, Hydraulics
Mr. John Smith, PE, Structure Design
Mr. W.D. Johnson, Roadside Environmental
Mr. D.J. Bowers, P.E., Division 3 Engineer
R - ?,?/ol
S R 1s6 ?(
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ekC?vti??c?r'J
'v/gn vi*ecl 4r eciG6
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4 reci _ 3 ?f y,, _? • _ 2? ?. 3 S F
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B 0If- W I
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Foundation Excavation Quantities
Bridge at Station 176 (Bridge nearest to NC 210)
Bent # Natural Ground Depth of Cut Volume
Elevation (CY)
1 4.5 4.5 44.7
2 1.5 1.5 14.9
3 0.5 0.5 5.0
4 2.0 2.0 19.9
5 3.0 3.0 29.8
6 3.5 3.5 34.8
7 3.0 3.0 29.8
8 2.0 2.0 19.9
Bridge at Station 160 (Bridge nearest New River Inlet)
Bent # = Natural Ground Depth of Cut Volume
Elevation (CY)
1 2.5 2.5 24.8
2 2.0 2.0 19.9
3 1.5 1.5 14.9
4 1.5 1.5 14.9
5 1.5 1.5 14.9
6 1.5 1.5 14.9
7 2.0 2.0 19.9
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