20190211 Ver 1_U-5875_SMP_20191212_20191212

Hi hwa North Carolina Department of Transportation t
F gStOYYY Highway Stormwater Program g°
= STORMWATER MANAGEMENT PLAN
(Version 2.08; Released April 2018) FOR NCDOT PROJECTS
WBS Element: 44677.1.1 TIP No.: U-5875 County(ies): PITT Page 1 of 3
General Project Information
WBS Element:
44677.1.1 ITIP Number: U-5875 Project Type: Roadwa Widenin Date: 11/27/2018
NCDOT Contact:
Betty Ann Caldwell, PE
Contractor I Desi ner:
JAndy Howell, PE
Address:
1037 W.H. Smith Blvd
PO Box 1587
Address:
SEPI Engineering & Construction
1025 Wade Avenue
Raleigh, NC 27605
Greenville, NC 27835
Phone:
252-439-2808
Phone:
919-747-5389
Email:
bacaldwell ncdot. ov
Email:
ahowell se ien ineerin .com
City/Town:
Greenville
1 Count ies :
Pitt
River Basin(s):
Tar -Pamlico
CAMA County?
No
Wetlands within Project Limits?
Yes
Project Description
Project Length (lin. miles or feet):
2.411 miles Surrounding Land Use: lAgricultural fields w/ residential development; limited forested areas adjacent to streams
Proposed Project
Existing Site
Project Built -Upon Area ac.
33.5 ac.
19.9 ac.
Typical Cross Section Description:
The proposed cross section is 4 - 12 foot lanes with 5 foot bike lane, curb and gutter
section, and grassed shoulder seperated by a raised grass median. The shoulder point to
shoulder point width is 105 feet
3- 12 foot lanes with varying paved shoulder. The existing road has a shoulder section
with roadway ditches.
Annual Avg Daily Traffic (veh/hr/day):
Design/Future: 35100 Year: 2040
Existing: 23517 Year: 2020
General Project Narrative:
(Description of Minimization of Water
Quality Impacts)
The purpose U-5875 is to widen and upgrade SR 1203 (Allen Road) from SR 1467 (Stantonsburg Road) to US 13 (Dickinson Avenue) to a four -lane divided facility with a raised
median and curb and gutter in Greenville. The project replaces 3 existing crossings to Reinforced Concrete Box Culverts. There is no direct discharge to surface waters or buffer
zones. The ultimate receiving water source is Green Mill Run. Existing land use in the vicinity consists primarily of agricultural fields with scattered rural residences.
Opportunities for Swale treatment exist primarily on the east side of Allen Road as the west side of Allen Road has more existing development. Where practical, full treatment via
swales has been provided. Where not practical, constraints to treatment are described in detail in the "Additional Comments" section of the Swales section of the Stromwater
Management Plan.
Surface Water Body 1 :
waterbody Information
Green Mill Run
NCDWR Stream Index No.:
28-96
NCDWR Surface Water Classification for Water Body
Pr mary Classification:
Class C
Supplemental Classification:
Nutrient Sensitive Waters NSW
Other Stream Classification:
Impairments:
I 303d listed for Benthos Severe
Nar, AL, FW
Aquatic T&E Species?
I Comments:
NRTR Stream ID:
JGreen Mills Run
Buffer Rules in Effect: Tar -Pamlico
Project Includes Bridge Spanning Water Body?
No
I Deck Drains Discharge Over Buffer? N/A
Dissipator Pads Provided in Buffer? N/A
Deck Drains Discharge Over Water Body?
N/A
(If yes, provide justification in the General Project Narrative)
(If yes, describe in the General Project Narrative; if no, justify in the
General Project Narrative)
(If yes, provide justification in the General Project Narrative)

Highway North Carolina Department of Transportation
Storrtm"�tr 7,
„<,,..,,.,, Highway Stormwater Program
STORMWATER MANAGEMENT PLAN
(Version 2.08; Released April 2018) FOR NCDOT PROJECTS
WBS Element: 44677.1.1 TIP No.: U-5875 Count ies : Pitt Page 2 of 3
Additional Waterbody Information
Surface Water Body 2 : North Fork Green Mill Run
NCDWR Stream Index No.:
28-96
NCDWR Surface Water Classification for Water Body
Primary Classification:
Class C
Supplemental Classification:
Nutrient Sensitive Waters NSW
Other Stream Classification:
Impairments:
303d listed for Benthos Severe
Nar, AL, FW
Aquatic T&E Species?
Comments:
NRTR Stream ID:
Stream SE
Buffer Rules in Effect: Tar -Pamlico
Project Includes Bridge Spanning Water Body?
INo
I Deck Drains Discharge Over Buffer? I N/A
Dissipator Pads Provided in Buffer? I N/A
Deck Drains Discharge Over Water Body?
I N/A
(If yes, provide justification in the General Project Narrative)
(If yes, describe in the General Project Narrative; if no, justify in the
General Project Narrative)
(If yes, provide justification in the General Project Narrative)
Surface Water Body 3 : 1 Unnamed Tributar, to Green Mill Run
NCDWR Stream Index No.:
28-96
NCDWR Surface Water Classification for Water Body
Primary Classification:
Class C
Supplemental Classification:
Nutrient Sensitive Waters NSW
Other Stream Classification:
Impairments:
303d listed for Benthos Severe
Nar, AL, FW
Aquatic T&E Species?
Comments:
NRTR Stream ID:
Stream SA
Buffer Rules in Effect: Tar -Pamlico
Project Includes Bridge Spanning Water Body?
INo
I Deck Drains Discharge Over Buffer? I N/A
Dissipator Pads Provided in Buffer? I N/A
Deck Drains Discharge Over Water Body?
I N/A
(If yes, provide justification in the General Project Narrative)
(If yes, describe in the General Project Narrative; if no, justify in the
General Project Narrative)
(If yes, provide justification in the General Project Narrative) I
Surface Water Body 4 : 1
NCDWR Stream Index No.:
NCDWR Surface Water Classification for Water Body
Primary Classification:
Supplemental Classification:
Other Stream Classification:
Impairments:
303d listed for Benthos Severe
Nar, AL, FW
Aquatic T&E Species?
Comments:
NRTR Stream ID:
Buffer Rules in Effect:
Project Includes Bridge Spanning Water Body?
Deck Drains Discharge Over Buffer?
Dissipator Pads Provided in Buffer?
Deck Drains Discharge Over Water Body?
(If yes, provide justification in the General Project Narrative)
(If yes, describe in the General Project Narrative; if no, justify in the
General Project Narrative)
(If yes, provide justification in the General Project Narrative)
Surface Water Body 5 :
NCDWR Stream Index No.:
NCDWR Surface Water Classification for Water Body
Pr mary Classification:
Supplemental Classification:
Other Stream Classification:
Impairments:
Aquatic T&E Species?
Comments:
NRTR Stream ID:
Buffer Rules in Effect:
Project Includes Bridge Spanning Water Body?
Deck Drains Discharge Over Buffer?
Dissipator Pads Provided in Buffer?
Deck Drains Discharge Over Water Body?
(If yes, provide justification in the General Project Narrative)
I
(If yes, describe in the General Project Narrative; if no, justify in the
General Project Narrative)
(If yes, provide justification in the General Project Narrative)

Hi hwa North Carolina Department of Transportation 4�
g rmwater ,o
Highway Stormwater Program
STORMWATER MANAGEMENT PLAN'°"'"A
(Version 2.08; Released April 2018) FOR NCDOT PROJECTS
WBS Element: 44677.1.1 TIP No.: U-5875 County(ies): PITT Page 3 of 3
Swales
Sheet
No.
Station & Coordinates
(Road and Non Road
Projects)
Surface
Water
Body
Base
Width
ft
Front
Slope
(H:1)
Back
Slope
H:1
Drainage
Area
(ac)
Recommended
Treatm't Length
(ft)
Actual
Length
(ft
Longitudinal
Slope
%
Q2
cfs)
V2
(fps)
Q10
(cfs)
V10
(f s
Rock
Checks
Used
BMP
Associated w/
Buffer Rules?
4
FROM -Y- STA 21+50 LT
(3)Unnamed
Tributary to
3.0
3.0
3.0
1.4
141
300
1.70%
3.2
1.9
4.1
2.1
No
Yes
TO -Y- STA 25+00 LT
4
FROM -Y- STA 21+90 RT
(3)Unnamed
Tributary to
0.0
3.0
3.0
0.4
39
178
1.30%
1.1
1.3
1.4
1.4
No
Yes
TO -Y- STA 24+00 RT
4
FROM -Y- STA 21+26 LT
(3)Unnamed
Tributary to
2.0
3.0
3.0
2.6
255
255
0.50%
11.4
1.8
14.8
1.9
No
Yes
TO -L- STA 21+65 RT
5
FROM -L- STA 24+23 RT
(3)Unnamed
Tributary to
2.0
3.0
3.0
1.1
107
122
0.50%
4.0
1.4
5.3
1.5
No
Yes
TO -L- STA 26+05 RT
5
FROM -L- STA 26+25 RT
(3)Unnamed
Tributary to
3.0
3.0
3.0
16.1
1606
695
0.52%
23.6
1.8
30.9
1.9
No
Yes
TO -L- STA 33+76 RT
7
FROM -L- STA 53+78 RT
(1)Green Mill
Run
3.0
3.0
3.0
9.2
920
922
0.91 %
30.2
2.0
39.6
4.0
Yes
Yes
TO -L- STA 63+70 RT
8
FROM -L- STA 63+90 RT
(1)Green Mill
Run
3.0
3.0
3.0
10.7
1067
1.38%
29.1
2.0
38.2
4.0
Yes
Yes
TO -L- STA 71+61 RT
12
FROM -L- STA 121+50 RT
(2)North Fork
Green Mill
4.0
3.0
3.0
4.7
474
492
1.20%
14.2
2.0
18.5
4.0
Yes
Yes
TO -L- STA 127+10 RT
13
FROM -L- STA 128+05 LT
(2)North Fork
Green Mill
3.0
3.0
3.0
3.6
356
500
0.30%
10.9
1.5
14.1
1.6
No
Yes
TO -L- STA 134+00 LT
13
FROM -L- STA 129+00 RT
(2)North Fork
Green Mill
0.0
3.0
3.0
2.0
197
200
0.30%
7.0
1.3
9.1
1.5
No
Yes
TO -L- STA 131+00 RT
Additional Comments
Recommended length was calculated based on the total drainage area. Where practical, an effort was made to treat the total area on the project through grassed swales. The swale from -L- Sta 26+25 to Sta 33+76 RT is
695 feet long. The recommended Swale length is 1606 feet which accounts for 11.07 acres of offsite agricultural drainage coming to the project via an existing Swale. The 695 feet Swale is sufficient to treat the drainage area
minus the 11.07 acres of agricultural land. See Attatchment 1, aerial imagery in the area. The Swale from -L- Sta 63+90 to Sta 71+61 RT is 693 feet long which is not as long as the recommended length. In this area, it is
not possible to created a longer Swale because of limitations from Parcel 44 at Sta 72+00 RT. Creating a longer Swale would require taking a business.

1025
Raleig
SEPI Tel:91
ENGINEERING & Fax:9'
O (9 CONSTRUCTION Licens
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SSED SWAIZ;R
DETAIL 11
PF' \- PROPOSE
CA N-PLACE RCBC
FLOODPLAIN BENCH
CL 'I' RIP
%
r
r ' •!
11.07 ACRES OF THE (TOTAL 16.06 ACRES)
DRAINAGE AREA COMING TO THE PROPOSED
HEAD DITCH IS COMING FROM AN EXISTING
OFFSITE DITCH WHICH CURRENTLY DRAINS
DIRECTLY TO THE JURISDICTIONAL STREAM.
THE EXISTING DITCH DRAINS PRIMARILY AN
AGRICULTURAL FIELD. NO SUBSTANTIVE
CHANGES TO THE EXISTING CONDITION ARE
PROPOSED COMING TO THE HEAD DITCH AT
STA. 2 9 + 00 RT.
i
SPECIAL CUT 3-FT
BASE GRASSED SWALE
SEE DETAIL 4
1'. Tm
STANDARD 3-FT BASE
DITCH W/CL B RIP RAP
SEE DETAIL 21
GRADE- 6.96%
DDE = 62.5 CY
CL 'B' RIP RAP=35.7 TONS
GEOTEXTILE=53 CF
DETAIL 3
SPECIAL CUT DITCH
( Not to Scale)
Front
t Ditch
Natural 3'1yt Slope
Ground ? D F\o
Min. D = 1.0 Ft.
FROM -L- STA. 23 + 00 TO -L- STA. 24 + 78 LT
0
`- CL 'I' RIP RAP
Q� EST. 7 TONS
• EST. 15 SYGF
NNA
SPECIAL CUT 'V' 14
GRASSED SWALE
SEE DETAIL 9 CL 'I' RIP RAP
EST. 7 TONS
EST.15 SYGF
A
0 J REMOVE
7]f!
r.2
1b.
wr
GRASS SWALE DATA GRASS SWALE DATA
)A= 1.07 ACRES DA= 16.06 ACRES
;LOPE= 0.5% SLOPE= 0.52% t r ♦� %'
-OTAL IMP. AREA=0.76 ACRES TOTAL IMP. AREA=2.61 ACRES
1DDITIONAL IMP. AREA=0.39 ACRES ADDITIONAL IMP. AREA=1.36 ACRES
REQ. = 107 FT L REQ. = 1606 FT ► �l �"
PRO. = 122 FT L PRO. = 695 FT
W = 4.04 CFS Q2 = 23.61 CFS
/2 = 1.38 FPS V2 = 1.79 FPS
)2 - 0.71 FT D2 = 1.66 FT i yet
)10= 5.30 CFS Q10= 30.92 CFS ♦ -� `!
110= 1.48 FPS V10= 1.92 FPS
>10= 0.81 FT D10= 1.87 FT � ♦-_ �` ._-
J
4 + 23 -L- TO 2 6 + 05 -L- RT STA. 2 6 + 2 5 -L- TO 33 + 76 -L- RT •
�•�
DETAIL 9 i • . `
SPECIAL CUT GRASSED SWALE �� Sr _ ♦ . ,
( Not to Scale)
Front M1� ~�� !//_ ♦ �. { : '� S v.1
� o� Ditch
Natural g'• �g( Slope t _
Ground ?'I k\o� Ir
Min. D=1.5 Ft. r i
_ 50' 0' 50, 100'
FROM -L- STA. 28 + 50 TO -L- STA. 33 + 76 RT. ~ �+�•
GRAPHIC SCAL �.
DETAIL 11
SPECIAL CUT GRASSED SWALE
( Not to Scale)
Natural o, Front
GroundD 121" o yet Ditch
� � � Slope
4 _B] Min. D = 1.5 Ft.
B = 2.0 Ft.
DETAIL 21 �►
STANDARD BASE DITCH
( s_
Natural Not to Scale) Natural
Ground �'•/ n� \ Ground '•
JN1
Geotextile B Min. D=1 Ft.
Max. d -1 Ft.
B= 3 Ft. R t r
FROM -L- STA. 24+23 TO -L- STA. 26+05 RT. FROM -L- STA. 26+25 TO -L- STA. 28+50 RT.
Type of Liner- CL B Rip -Rap
FROM -L- STA. 28 + 50 (75 RT) TO STA. 28 + 82 (135 RT)
z '