B-5318 Prelim Info for discussion

Replacement of Bridge No . 126 over
Smith Creek on Ligon Mill Road
(SR 2044) in Wake Forest
TIP : B-5318
Background information and photographs Page 2
Early planning Page 4
Agency coordination Page 5
Categorical Exclusion Page 6
Current Design Information Page 8
Constructability Review Meeting Page 9
Bank stabilization of Smith Creek Page 10
Relocation of UT to Smith Creek Page 11
Roadway Impacts Page 12
Utility Impacts Page 13
Conservation Easement Page 17

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BENT 3 WITH CRUTCH BENTS (LOOKING SOUTH) .
3

Early Planning
Early project planning for this project was completed by the NCDOT Project Development Unit.
A September 15, 2015 meeting was held to discuss constructability and feasibility of preliminary bridge replacement
alternatives for the project. Four alternatives were discussed:
• Alternative 1 (3-lane bridge; replace on new location to the east and raising grade to accommodate a greenway;
maintain traffic on existing bridge).
• Alternative 2 (3-lane bridge; replace on new location to the east with maintaining similar grade; maintain traffic
on existing bridge).
• Alternative 3 (3-lane bridge; replace in place and raising grade to accommodate a greenway; offsite detour).
• Alternative 4(3-lane bridge; replace in place with maintaining similar grade; offsite detour).
Alternatives 3 and 4 retain the bridge in existing location beneath a high-voltage transmission line. A bridge on existing
location will require the transmission line to be relocated at a cost reaching+/- $1,000,000. This would require a two-
year relocation period for Duke Energy to obtain regulatory approvals for relocating the transmission line. The team
eliminated Alternatives 3 and 4 from further consideration due to: 1) extensive impact on utilities and 2) rerouting a
large volume of traffic using an off-site detour.
Other issues noted in the meeting were the likely relocation of sewer lines outside of the construction limits in wetland
areas and relocation of an existing overhead electric distribution line.
4

Agency Coordination
Input from federal, state and local officials was requested in a scoping letter sent out December 22, 2010. The letter
included Figure 3 (Jurisdictional Features) (see below)that indicated the presence of a large wetland (Wetland A), Smith
Creek and Stream SB (UT to Smith Creek) in the project study area. The NC Wildlife Resource Commission (March 28,
2011) indicated that the property located in the northeast quadrant of the project has a Clean Water Management Trust
Fund conservation easement; impacts to this property should be avoided. A review of the project on ATLAS indicates
that the CWMTF easement is actually in the northwest quadrant. Eric Alsmeyer provided some information via email on
February 4, 2021, regarding the scoping letter. Mr.Alsmeyer indicated that he could not find any record of the scoping
letter and it would have been unlikely that he would have provided a response for a bridge project due to workload.
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FIGURE 3:.IURI5DICTIC)NAL FEATURES it. .
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5

Categorical Exclusion
The Categorical Exclusion was signed on April 27, 2017.
Construction Alternatives:
No-Build Alternative
The No-Build Alternative was eliminated as it would eventually result in the closing of the road which is unacceptable
due to traffic volumes served by Ligon Mill Road.
Build Alternatives
• Alternative 1 (Preferred):
Replacement of the bridge to the east of the existing location with a 200 ft x 58 ft wide bridge. The roadway
elevation would be six ft higher than the existing bridge to accommodate a future greenway. Note:This alternative
anticipated impacts of 296 linear ft of stream impact and 0.46 ac of wetland impact.
• Alternative 2:
Replacement of bridge to the east of the existing location with a 250 ft x 58 ft wide bridge. This alternative was
eliminated because it provides lower clearance under the bridge, does not accommodate a greenway and it requires
a 50 ft longer bridge due to hydraulic considerations.
Alternatives Eliminated from Further Consideration
• Rehabilitation: Deteriorating concrete and steel elements of the superstructure and decaying timber elements
of the substructure made it impractical and too costly for repair and rehabilitation.
• Staged Construction: Staged construction is not feasible for this bridge because the superstructure type
(prestressed concrete channels) and steel pile crutch bents will not support removal of a portion of the bridge
while maintaining traffic on the remaining portions of the bridge.
• Offsite Detour: Alternatives that involve an off-site detour were eliminated from further consideration due to
concerns of the local fire department and school system, as well as the presence of existing overhead utilities
south of the existing bridge.
Permitting info in the Categorial Exclusion:
The document indicated that the limited environmental impacts on the project could allow the Department to permit
the project with a NWP 23 and NWP 33.
Typical sections in Categorical Exclusion:
The proposed typical section along the bridge is 2 @ 11 ft travel lanes, 11 ft center turn lane, 2 @ 5 ft bike lanes, 2 @ 5 ft
6 in sidewalks and 2 ft gutter on each side. A 15 ft wide concrete greenway will be constructed under the bridge to
accommodate a future greenway.
6

5.5' 47' CLEAR ROADWAY WIDTH 55'.,�
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ilk
BIKE 111111 I
LANE LANE —
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TYPICAL SECTION ON STRUCTURE
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TYPICAL SECTION_-ON ROADWAY

Current Design Information
The updated typical section along the bridge is 2 @ 12 ft travel lanes, 12 ft center turn lane, 2 @ 8 ft multi use path and
3 ft travel edge and barrier on each side. A 15 ft wide concrete greenway will be constructed under the bridge to
accommodate a future greenway.
i .4-SP. 2044 iLIGON Min R.OALTI
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Bridge Typical I
C -L-RR 2044 (LIGON MILL ROAD'
33.5 33.5'
13.5' ,2 12 ,_. 12 • _ 12' 2' 13.s
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SHARE0.USE - --SHARED-USE- -
PATH&I PATH
GRADE CI CD hi
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2 / .02 I III
=02- 11 ;
■
L Roadway Typical
The current bridge design is a 3-span bridge (1@ 60 ft, 1@ 90 ft, 1@ 50 ft)that spans Smith Creek.
TOTAL BRIOGE LENGTH.200•-O-]FILL FACE TO FILL FACET
EARTH BERM 60,-0-(SPAN A7 90'-12"(SPAN 9.1 SO'-Cr C]
EL.204.51 rLEYELI - `
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EXISTING STRUCTURE[TYP.]
UNCL ASSIFIEO
EXCAVATION 11SF.7 PLAN
8

Constructability Review Meeting (July 1, 2021)
Existing bridge/roadway and proposed bridge/roadway are located under a 500 kV Duke Energy transmission line.
Required construction clearance of transmission line depends on the type of equipment and kV of line output. Over 500
kV requires over at least 35 ft clearance per Duke Energy requirements. Articulated equipment, such as a crane or
vertical rig are required to be below 50 ft clearance.
Access to construct the new end bent along south streambank: This will require construction of a temporary access road
and temporary bridge extending from the north streambank to the south streambank. This will result in no additional
impacts to wetlands. There will be approximately<0.01 ac temporary fill associated with the pilings from the temporary
access bridge.
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Access to remove existing in-stream piles:This will require construction of a temporary rip rap causeway extending from
the north streambank to near the midpoint of Smith Creek. There will result in no additional wetland impacts. There
will be approximately 26 linear feet of temporary stream impact(concurrent with permanent rip rap bank stabilization)
for the temporary causeway.
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TO ELEY_400.9' `
9

Bank stabilization of Smith Creek
The Department proposes to install Class II rip rap bank stabilization on both streambanks (Class II rip rap extending to
below the ordinary high water mark to provide long-term stabilization. The NCDOT Hydraulics Unit indicated that the
banks require stabilization during the Combined Field Inspection on October 10, 2017.This will result in 165 linear ft of
permanent stream impact.
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10

Relocation of Unnamed Tributary to Smith Creek
Construction of Alternative 1 (the preferred alternative) will result in the filling in of the Unnamed Tributary to Smith
Creek and relocation into a rip rap lined lateral base ditch. This activity will result in the permanent stream impact of
240 linear ft and temporary stream impact of 21 linear ft. The lateral base ditch will be designed to include
countersunk Class II rip rap in the base of the channel and Class I rip rap on the banks of the channel. Impacts will
extend to below the ordinary high water mark. The Categorical Exclusion indicated 296 linear feet of stream impacts
from the project.
SEE DETAILE 1 rIkl. \\4 ..STABILIZATION 5'LATERAL BASE DITC. �
L H DETAIL C •-.34 PP
CL_ II RIPRAP \ rx Rme i
+20.00 TO •HOULDER ! +69,19 21 linear
�.00 107.00'LT POIN EX KW lit feel , •
-
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R temporary
M �- +ea. ! -. stream
A
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-1 llll lll 1, I . --... .Val V2
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4 1 R 1 ie•y�"
- stream
r ii 1!ulatii � �
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i ; , ;1, ,,; �i./� fill i
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DETAIL
LATERAL BASE DITCH
( Not to calej Fib
*d final depth of riprap to be b Slope
determined in field I."
Natural — — 12.0'
Ground
CEOTEXTILE rB
Min. D= 3.0 Ft.
*B Use CL II riprap Max. d — 3.0 Ft,
for channel base B— 5 Ft.
Type of Liner— CL 1 Rip—Rap b 10 Ft,
11

Roadway impacts
Construction of Alternative 1 (the preferred alternative) will result in the permanent impacts to wetlands. Construction
of this alternative will result in the permanent wetland fill impact of 0.581 ac and permanent mechanized clearing
impact of 0.035 ac. The typical section provided in the Categorical Exclusion had an overall width of 67 feet. The
proposed typical section provides a total overall width of 75 feet (with guardrail which is required in the footprint of the
wetlands). The Categorical Exclusion indicated 0.046 ac of wetland impacts from the project.
�---735. , v LRE57 .5 -_^-, • DE PROTECL•t }
+56_'6 q- k 4 / 1,./ p.O35 ac 14 ,} } BANK STABIIliAT1ON 5'uTERAL BASE ntrC SEE O ;
+114
// i PETPJL H
7.52'BT � �� � a Hwy Permanent r�'� Ii � CL.II WRAP t)EIAILC E%�, ji
11,0
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-- t I:YFP•a::•t ~ + "' • - ---,- -.r;- - - `P2 DIP 'a .417A-; I I `•411::iiii: r lY P w
▪ x w!w, .:. ' 1 .n,� 4Vi wetland fill
~ - .a®a�"'"^"' a'.••• 'tgl %• f 44ii*4If1*3
from� •irii�iiYr' rfladway.
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eIiik c rue wetland fill " ipl;� Sr — �r _- -_
RT 7 _ _.9.25 from ErnanNc T E• • E E%16W
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e ,� roadway. i\ a »m.O
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12

Utility Impacts
Existing sewer easements cross Ligon Mill Road to the north of the existing bridge. The 50 ft wide easements contain a
30 in Ductile Iron Pipe (DIP) line and 18 in Vitrified Clay Pipe (VCP) line owned and operated by the City of Raleigh.
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fV 0:: _
22
+- 1/— PO .1' 13#40 R a .,P`m'e „iv'.
r
T = 3
***Note: Existing manholes indicated by blue circles in the above figure.
13

Construction of the project will require the following actions associated with this utility:
1) Relocation of existing manholes under the proposed roadway fill. No wetland or stream impacts.
2) Reconstruction of the 18 in VCP from the relocated manhole down to the next adjacent manhole (must be replaced
per City of Raleigh letter on 2/8/2018). This may result in 0.07 ac of excavation in wetland impact and no impacts to
streams.
3)Temporary installation of 30 in and 18 in bypass lines to facilitate continued use of the sewer line during utility
construction. No wetland or stream impacts.
5 MH 195807 * - i I
1 41
iii '„\
A 4. ...... \. \
.J.14\6' \'°. \
30" BYPASS LI Jr"
TO 30" SEwE
\ -".. ,ik
18" BYPASS LINE
± 114Y TO 18" SEWER
i 5 0
\\Ck.
AnticipatedJRelocated man excavation in 1 SSMH 195803
holes wetland impact of
1 SS MH 13512
0.07 ac (orange \' s
cross hatch) 0 }
. i,zzi Z f. .i. ,t xo 6.i., \
/ ± _.
. ,, ,x ,
d
z,16 V/ ;Fr 0 \ \ 5'BASE DITCH
'.MH • . :17 I �4. ••' MAKE FOREST dETdIL F
um SSM 1 �146.79 cy r De' •73 PG 304 1 BANK 37A9ILI1.. 10N
,r rt..':i a
ll 1 '` %, 1 Replacement of
%ie.
H d //f/J.. - .r 18 Ill VCP
w ' r4. Aw r'_ CL : RAP wir
m iirl.- 7YIIJJJJey 's.Ca!ri[m? or,L.R �i171:d ■Ig117,1111. i pFIIkui+JI[il111.79YP/l1111i111111 EP111Jp/9I- rAppi,"r!'• I'op, 'J//+111/!!!! 00
4.
•
.. ,
•
3t" 1 .. ..1.4 r 0 s
7 11E1= r .ems r J,ruig �+sra
> rr#f. lrn'4113Y� �w J_.L Mid%�1•IN■II�LWJJ�H�IfL7
• �'` �i : 'Jr'It M I••II��s�,1�- .77
Y -[iaa aria'l�J• r1ar..rrtr.-.: ` I L J�•II
REMOVE i 77,- _ b1T.s � ck�_ik_._ -.� �� r1�
0 CRP
- — J:r 'r - — _ -: aaF�!!: 'Ri83I�IaI'i nrra �
.111114. f_=W.� 3ai°in W Ar � ,►rF�4'Y er' �1 t9G Eh ,V�!71)"1a-�
1111116
�a.
14

4) Construction of a new gravel road to provide access in the northeast quadrant to allow City of Raleigh to provide
maintenance on the existing sewer lines in the easement (per City of Raleigh email on 7/22/2021). The interceptor is
critical for the system. Existing sewer easements in adjacent neighborhoods/sites are not designed for access with
heavy machinery, excavators,flush trucks, etc. Construction of any access driveway must meet the minimum design
standards for pump station access which is at a 10% maximum grade. Construction of this alternative will result in
APPROXIMATE permanent wetland fill impact of 0.121 ac and permanent mechanized clearing impact of 0.037 ac.
5•c 15 50.00
200 DRIVEWAY I-NG1H
EL.217.8 0.020 0.4314 I
EL.261.3 YY��:- -_�_
---------------
0.037 ac ORESi �,,
SEYENi \75,,,\,.
C ; ,
permanent aR r . 7
K ',TN
wetland 1—DRWI— POT Sta " w0.00= 1 4a. 4, \ �
"1 —L— POT -. t30.00
mechanized0
w0: R ' '...e.%
i , 1
clearing ,� �- +7 '5' �` 5"`�� TOWN Q' WAKE FOREST
-L- +58.'.6``' ' 141.38'LT S M
from utility ■ / GB 1�8T3 Pc 304 ,
access I011011M �' / Y ' MUTT- POT Ste. 10+00.00
p 4
road. ; / •,4 '. % rs, BE6I BRIDGE l
it
J o
If 1 _ r -i— —— * f Ste. 18 3.00+1- I b+ 4 `, 40 —R 1/ ;PEE DETAI O 1 7V.
+•' .5.1_a+ R` �a"'Tim J ✓ LA d ld.9b I
_ GLB R" P AL 1 d
�1rF
0.121 ac s0,1RM -:i ..4411I P.lxin�:--1511n9u alu�n.i.I�PPOI I11�1111/f(RR�B�.I.aYl��811J..IRR.....- �� I permanent ■iiaiab - a y:0Na.r •: r I�r.n11n1111/11 �11r111rerrnl�Areipq/iigiiiiOHM111117i3
wetland fill I uru 1 r 1I �..,
L.
/ � Z 11111/0-iFWIC
-2- f !-�- C IIIIII II f�f�f.
f 1 4 L4507).. ro11 tr--PIMP
from utility I _ -n ..R.. h -trt
.0.. HAND ael I • WillM,'� ::�:11
access' dir 4. r �i 1 7 P — r -r A[ $ Phi r )-r Yr +r -r ' f;fli_O�
road. �- I �l �I 'u !<: . al ,�rr�imui �G
LLJti$�TTr''!r. i'C .. iiN q.az iil�iyTy r e• i — . ■ . , Ire I
Gri 1� i�MI!■ -
--� i�-0.'�l'i_!+ Y=liar i m0— _ i 4' ����� �. .,
REMOVE w J4li� __ L am. _- : '�lv l i _ _ _ _ F/w*Aug; sue : —
.J P f71 �' -: .r�r:.=r�-1 ..y-; 7 r IZ D!P fM!:
— — S - +.in n n n.-wT�n., ,�7 >f.T.T.T.T h,..x n A. n.,.a....hell'''. _4,- .F..t 7
15

5) Adjustment to driveway tie in point for an existing gravel road in the northwest quadrant to allow City of Raleigh to
access a pump station. Construction of this alternative will result in the permanent mechanized clearing impact of 0.003
ac.
al.?. LA - r f ,I - T. • v• • v v
i....,...„=. _ .40 •,.. r
..%ilarr --- -,, w,- / .. .* ' /- Ofk
ji;:::!. EIP ci : id.aii \ ;,..1%.
r:-41ft -gd MAR tri.la;11,10.1?--;Vefrierlitirk;
9t113 _. P- 1 in raill=114NPF7W-.-
Ir 9 4:Al",
iiN
L'Im==...._ _ -im ± c'ellinblikli I
n::
I €M.OVE 1U - . - b '. . • .. .
- - ti -~,0- w _ _
4. . , - _
,4.ict Aro. ILL 'ip .ii
n .i - •'TZ:-.--'-'-'-6- ..d!gl.ajl..ii.
i :. ' r FE„,,,c. . ,:r.,... 1- I me ---„,,,, , i. .dli.isilltatigtettatiVIAlta.
. .-1:-. -L 6111,-"..-: li
Ar 4111r IIP 11 4
e 1- ..._ 1: . ".". •
1 6 , el g 14 FvE _ PU
9 ,07r RT -. �0 E
REMOVE EXIVIIN
.:0' RT 195-c1RT' F RCS �- STA
lir -17,_. . •
• . . -L- -I-66,78
T14-fit 1 ike 111..80' RT
. i , 4 •
Si� i �� LT -D {- PC Sta. }
'' 1 107_49 T
■ ; ;; \ -D � PT
Air+ ' +-+ k ,ctn. firi4 c
D. ; , NitiTOWN gJE2RE'
,0 l 733
permanent DB 10747 PG 2738
7 {Cori ser vat i on Eusemer
4 f
o. EN� tlr� III BIA PC 554
D .
mechanized
clearing
16

Conservation Easement
The Lewis-Tatum tract is a parcel owned by the Town of Wake Forest that was purchased with Clean Water
Management Trust Fund/North Carolina Land and Water Fund funds. The Department has worked with Marissa Hartzler
(Stewardship Program Manager for the NC Land and Water Fund)to provide temporary construction easements and a
permanent utility easement for construction of the bridge replacement project in the larger conservation easement.
The Department has completed all necessary coordination with the NCLWF regarding this issue. There will be no
impacts to jurisdictional features located within the Conservation Easement.
11 'S----.. .. --/-'------..________•
__7____ -- )
UGC"
--.� ---�� fr �r T �.
D 4
8—SH N 05' I BRIDGE•126
11.
7
1.01 GATE. c+ !® I'J !
r ' D .. - t1 4 TEMPORARY
) 1 7.,,,..
` t EreMPDVRCTY ¶
, ' cONE+SMRVAON II�1 ,II
4.
EASEMENT •I _ , I ri
{ll
OWNER:TOWN OF WAKE FOREST 1: i!
/ DR 107a7 PG 2733 Ir %. II
9M 2004 PG 554 -- ,!,�;r o 111 ll
®; W STATE OF NORTH CAROLINA / �i' ��z
t CONSERVATION EASEMENT // $e ri!w` `1
a.; y
VI' +. / DR 10747 PG 2736 ii4
OF yN w r' rr ' 5� 'I.
IN4/ik
/ 7' I '�
.OR I o^ 4 .` 1.1
-r� C. 0 11
ATE A
W �. $:i r t.�S F 14
E i+. / . - 91'-'" S q F ' II
1 /r �� 6' II
r fl
! e 7 f
T2 Dit
-i i
i
e
ry . -CON'
R
17