North Carolina Agricultural Sciences Center - C16123 - Stormwater Impact Analysis (2)

Stormwater Impact Analysis
SCM Report
For the proposed
North Carolina Agricultural Sciences Center
Raleigh, North Carolina

Prepared for
The State of North Carolina

Prepared By
Stewart Inc.

September 21, 2018
Revised November 7, 2018

Stormwater Impact Analysis

for

North Carolina Agricultural Science Center

Raleigh, North Carolina

Prepared for:

The State of North Carolina

Prepared by:

Stewart Inc.
Firm License No. 1051
223 S. West Street, Suite 1100
Raleigh, NC 27603
919.380.8750

FOR REVIEW ONLY

Stewart Project No. C16123

September 21, 2018
Revised November 7, 2018

STORMWATER IMPACT ANALYSIS
NORTH CAROLINA AGRICULTURAL SCIENCES CENTER
RALEIGH, NORTH CAROLINA

EXECUTIVE SUMMARY

This Stormwater Impact Analysis has been prepared specifically to address the
requirements of the State of North Carolina’s Stormwater Design Manual to
quantify the impact of the proposed development’s effect upon nutrient levels on
downstream systems. Specifically, the Neuse River Buffer Rule (15A NCAC
02B.0233) requires that diffuse flow be provided into Zone 2 of the buffer
associated with the stream adjacent to the proposed development. The stream is a
tributary of Macon Pond which flows into Richlands Creek. The stream is subject to
the Neuse River Buffer Rules because it is depicted on the latest 1:24,000 (7.5
minute) United States Geologic Survey (USGS) and the soil survey map prepared
by the Natural Resource Conservation Service. The Neuse River Buffer Rule also
requires no increase in peak flow from the 1-year, 24-hour storm event. Per the
State of North Carolina’s Stormwater Design Manual, as a High-Density
development, the post-development 10-year, 24-hour storm event must be safely
conveyed in a vegetated channel in such a way that it does not cause erosion. The
Total Nitrogen Export for the site must also be held to 3.6 lbs/ac/yr.

The Total Nitrogen Export (TNE) from the site was calculated using the apportioning
method to calculate the nutrient impacts on the site. Using this method, the “area
of new development” is 38.71 ac (7.102 ac of additional impervious and 31.61 ac of
apportioned open space). The TNE for the “area of new development” is 4.87
lb/ac/yr. This export was reduced to 3.39 lb/ac/yr (meeting the export threshold of
3.6 lb/ac/yr) by treatment of a 7.260 ac of impervious area at 35% removal rate.

As is detailed below, there are three points of analysis for this site. The peak flow
rate in the post-development condition is 4.98 cfs, 1.70 cfs, and 4.56 cfs, at the
north, east, and south outlets respectively for the 1-year, 24-hour event. The peak
flow rate in the post-development condition is 55.64 cfs, 6.50 cfs, and 18.24 cfs, at
the north, east, and south outlets respectively for the 10-year, 24-hour event. All
analysis points are proposed to be fitted with oversized riprap dissipation pads to
provide further velocity reduction.

Site Information
The proposed North Carolina Agricultural Sciences Building will be located in
Raleigh, Northeast of downtown toward William B. Umstead State Park. Currently
the site consists of 1074 acres which contain forest, pasture lands, and minimal
impervious. Numerous State-owned buildings dot the property, including Prairie
Ridge Ecostation and motor fleet management. Only a fraction of the parcel will be
used for the proposed development, which will sit on 40.12 acres at the corner of

Edwards Mill and Reedy Creek Rd. This area of 40.12 acres is considered the
“project area” for low-density development calculations.

Figure 1.0 – Vicinity Map for the Proposed Agricultural Sciences Center

This analysis is for the proposed improvements to the site, which will include
bioswales in multiple locations to treat stormwater runoff. Additionally, a
bioretention cell located in the northeastern quadrant of the site will treat an 9.07-
acre drainage area with 63.4% of the area being impervious surfaces. A stepped
bioswale in the southeastern quadrant will be used to treat 2.49-acres, 60.3% of
the area being impervious surfaces. In the predevelopment condition there are
11,250 sf (0.25 ac) of impervious area, resulting in 0.644% impervious in the
40.12 acre project area. In the proposed condition there are 325,735 sf (7.48 ac) of
impervious area, resulting in 18.63% impervious in the 40.12 acre project area.
This is within the allowed 24% impervious for low-density development. Due to the
concentration of impervious within the southern part of the project area, the project
is being permitted as high density.

The site is within the Neuse River Basin and drains to the Richlands Creek
watershed. The property is not within a noted FEMA Floodplain. The Wake County
Soil Survey Map indicates the soils on site consist mainly of sandy loams, which are
classified as Hydrologic Soil Group B.

Proposed Improvements
The proposed improvements associated with this project include a 220,000 SF
science building which will include labs and offices for five State agencies within the
Department of Agriculture. Additionally, there will be parking lots for the building,
and a loop road which will provide connectivity between the proposed parking lots
and Reedy Creek Rd.

The runoff from two-thirds of the roof and parking lots, as well as much of the road,
will be directed to the proposed bioretention area. Most runoff from the parking lots
located north of the building will first be directed to bioswales to be located
between parking aisles before being directed to the bioretention area via a series of
stormwater pipes. Stormwater runoff from the remaining third of the building and
parking lots will be directed to the proposed stepped bioswale facing Reedy Creek
Rd.

Overall Results / Summary

Peak Flow Analysis
The table below includes the pre- and post-development peak flow for the 1
1-year, and 10-year, 24-hour storms and the associated percent change. The peak
flow in the proposed condition is reduced for the 1-year, 24-hour event at all
analysis points. See Appendix 3 for detailed calculations.

Table 1.0 – Pre and Post Peak Flow Rates:
PEAK FLOW SUMMARY (CFS)
Return
Period
Analysis
Point PRE POST (no detention)
POST with
detention
%
CHANGE
1 YR
NORTH 5.38 24.79 4.98 -7.53%
EAST 2.69 1.70 -36.65%
SOUTH 4.61 9.75 4.56 -1.19%
10 YR
NORTH 34.17 65.29 55.64 62.84%
EAST 10.70 6.50 -39.25%
SOUTH 16.35 27.99 18.24 11.52%

Table 2.0 – Pre and Post Peak Velocity:
Velocity Summary Table (ft/sec)
PRE POST
STORM EVENT DRAINAGE AREA w/o detention w/ detention % DIFF
1-YR
NORTH 2.76 4.14 2.63 -5%
EAST 3.38 3.16 -7%
SOUTH 7.44 9.8 8.16 10%
10-YR
NORTH 4.84 5.3 5.09 5%
EAST 5.27 4.87 -8%
SOUTH 10.01 11.97 11.22 12%

Engineer’s Conclusion

Because of the increase in the peak flows from the new development, a bioretention
device will be used in the northern portion of the site to provide peak flow
attenuation and meet diffuse flow requirements into zone 2 of the stream. The peak
flow in the southern part of the property is proposed to be mitigated by a stepped
bioswale and, as is shown in table 1.0. Each drainage area has been designed to
utilize vegetated conveyance to not produce erosive velocities. All peak flow
calculations have been included within this report.

Submitted 21st day of September 2018 by STEWART
Resubmitted 7th day of November 2018 by STEWART

Joseph Puckett, PE

Appendix 2

Site Information
a. Aerial Map
b. QUAD Map
c. FEMA Map
d. Soils Map
e. Rainfall Data

Hydrologic Soil Group—Wake County, North Carolina
(Co-Located Labs)
Natural Resources
Conservation Service
Web Soil Survey
National Cooperative Soil Survey
12/29/2016
Page 1 of 4396540039655003965600396570039658003965900396600039661003966200396630039664003966500396540039655003965600396570039658003965900396600039661003966200396630039664003966500706200706300706400706500706600706700706800706900707000
706200 706300 706400 706500 706600 706700 706800 706900 707000
35° 49' 17'' N 78° 43' 4'' W35° 49' 17'' N78° 42' 28'' W35° 48' 39'' N
78° 43' 4'' W35° 48' 39'' N
78° 42' 28'' WN
Map projection: Web Mercator Corner coordinates: WGS84 Edge tics: UTM Zone 17N WGS84
0 250 500 1000 1500
Feet
0 50 100 200 300
Meters
Map Scale: 1:5,830 if printed on A portrait (8.5" x 11") sheet.
Soil Map may not be valid at this scale.
Hydrologic Soil Group
Hydrologic Soil Group— Summary by Map Unit — Wake County, North Carolina (NC183)
Map unit symbol Map unit name Rating Acres in AOI Percent of AOI
AgC2 Appling gravelly sandy
loam, 6 to 10 percent
slopes, moderately
eroded
B 0.1 0.1%
ApB Appling sandy loam, 2 to
6 percent slopes
B 10.2 10.1%
ApC Appling sandy loam, 6 to
10 percent slopes
B 7.2 7.1%
ApC2 Appling sandy loam, 6 to
10 percent slopes,
moderately eroded
B 1.6 1.5%
ApD Appling sandy loam, 10
to 15 percent slopes
B 8.4 8.3%
CeD Cecil sandy loam, 10 to
15 percent slopes
A 17.2 17.0%
CgB2 Cecil gravelly sandy
loam, 2 to 6 percent
slopes, moderately
eroded
B 24.0 23.7%
CgC2 Cecil gravelly sandy
loam, 6 to 10 percent
slopes, moderately
eroded
B 18.2 17.9%
CmA Chewacla sandy loam, 0
to 2 percent slopes,
frequently flooded
B/D 0.5 0.5%
CnA Colfax sandy loam, 0 to
3 percent slopes
C/D 0.0 0.0%
MeA Mantachie sandy loam,
0 to 2 percent slopes,
rarely flooded
B/D 4.9 4.8%
PaF Pacolet sandy loam, 15
to 45 percent slopes
B 1.5 1.5%
W Water 2.6 2.6%
WmE Wedowee sandy loam,
15 to 25 percent
slopes
B 1.4 1.4%
WyA Worsham sandy loam, 0
to 3 percent slopes
D 3.6 3.5%
Totals for Area of Interest 101.5 100.0%
Hydrologic Soil Group—Wake County, North Carolina Co-Located Labs
Natural Resources
Conservation Service
Web Soil Survey
National Cooperative Soil Survey
12/29/2016
Page 3 of 4
Project: NCDA&CS Date: 11.6.2018 Revision:-
Project No:C16123 By:NBC
North Drainage Area to Bioretention
Input values in red
395,275 144,615
395,275 0
0 0
144,615
73,728
57,542
86,904
27,510
4,976
0
0
0
250,660
9.07 ac
5.75 ac
63.41 %
Design Rainfall 1.0 in
"Simple Method" Formula Rv = 0.05+0.009(I)
where
Rv=0.62 in/in
Controlled Volume Calculation Volume = (Design Rainfall) (Rv) (Drainage Area)
Volume =0.47 ac-ft
Volume =20446 cf <----- Total Volume Required to be Controlled (Storage)
* = Report only amount of existing BUA that will reamain after
develoipment. Do not report any existing BUA that is to be removed and
which will be replaced by new BUA
On-site Parking (sf)
Pervious Surface Area
Managed Pervious Area (sf)
Unmanged Pervious Area (pasture) (sf)
Forest (sf)
Total Pervious Area (sf)
Total Drainage Area (sf)
Other On-site (sf)
Future (sf)
Off-site (sf)
Existing BUA* (sf)
Total Impervious Area (sf)
Off-site Drainage Area (sf)
Impervious Surface Area
On-site Buildings/Lots (sf)
On-site Streets (sf)
On-site Drainage Area (sf)
On-site Sidewalks (sf)
Bioretention Area Sizing Runoff Volume - Simple Method
Drainage Area
Percent Impervious
This volume of runoff must be stored in the pond above the normal pool elevation and be
released in a draw down period of 2 to 5 days.
Rv = Runoff Coefficient = stormwater runoff (inches) /
stormwater rainfall (inches)
I = Percent Impervious = drainage area (acres) /
impervious portion of the drainage area (acres)
Impervious Area
Drainage Area
223 S. West Street, Suite 1100, Raleigh, NC 27603 Tel [phone] Fax [phone] www.stewartinc.com Design Volume - Simple
Project: NCDA&CS Date: 11.6.2018 Revision:-
Project No:C16123 By:NBC
North Drainage Area to Bioretention
Input values in red
395,275 144,615
395,275 0
0 0
144,615
73,728
57,542 98
86,904 61
27,510 61
4,976 58
0
0
0
250,660
9.07 ac
5.75 ac
63.41 %
Design Rainfall 1.0 in
"NRCS" Formula S = (1000/CN) - 10
Q* = [(P - 0.2S) ^2] / (P + 0.8S)
where
S=0.204
Q*=0.79 in/in
Controlled Volume Calculation Volume = (Design Rainfall) (Q*) (Drainage Area)
Volume =0.38 ac-ft
Volume =16521 cf <----- Total Volume Required to be Controlled (Storage)
On-site Parking (sf)
On-site Sidewalks (sf)
Other On-site (sf)
Bioretention Area Sizing Runoff Volume - NRCS
Drainage Area Pervious Surface Area
Total Drainage Area (sf)Managed Pervious Area (sf)
On-site Drainage Area (sf)Unmanged Pervious Area (pasture) (sf)
Off-site Drainage Area (sf)Forest (sf)
Total Pervious Area (sf)
Impervious Surface Area
On-site Buildings/Lots (sf)
On-site Streets (sf)
Future (sf)
Off-site (sf)
Existing BUA* (sf)
Drainage Area
Impervious Area
Percent Impervious
Total Impervious Area (sf)
P = Design rainfall (inches)
Q* = Runoff Depth (inches)
This volume of runoff must be stored in the bioretention area and be released in a draw down
period of 12 to 72 hours.
** = if CN of non-directly-connected drainage area is less than 64, MDC
allows assumption for zero runoff from this area. Therefore SCM water
quality volume only accounts for contributing runoff from impervious area.
* = Report only amount of existing BUA that will reamain after
develoipment. Do not report any existing BUA that is to be removed and
which will be replaced by new BUA
Curve Number by Landuse
Impervious area
Managed Pervious Area, good condition **
Unmanged Pervious Area (pasture)
Forest
223 S. West Street, Suite 1100, Raleigh, NC 27603 Tel [phone] Fax [phone] www.stewartinc.com Design Volume - NRCS
Project: NCDA&CS Date: 11.6.2018 Revision:-
Project No:C16123 By:NBC
Input values in red
Volume =20446 cf <----- Total Volume Required to be Controlled (Storage)
Required Surface Area
1.00 ft
Surface Area Calculation Surface Area = (Volume) / (Ponding Depth)
Surface Area 20,446 sf
Bio Retenion Area Volume Provided
Stage Level
Elevati
on (ft)
Area
(ft2)
Stage
Volum
e (ft3)
Cumulat
ive
Storage
(ft3)
0 415.5 20413 0 0
1 416.5 24621 22517 22517 OK
Drawdown Time
22517 cf
24621 sf
1.00 in/hr
Drain Time T = (Volume) / (Infiltration Rate) / (Surface Area)
T =10.97 hours
Ponding Depth
Facility Volume
Facility Surface Area
Media Infiltration Rate
Bio Retention Area Design Volume/Drawdown Time
223 S. West Street, Suite 1100, Raleigh, NC 27603 Tel [phone] Fax [phone] www.stewartinc.com Provided Volume
Project: NCDA&CS Date: 11.6.2018 Revision:-
Project No:C16123 By:NBC
Input values in red
Water Draw Through Rate:
Darcy's Equation:Q = (.0000232)*K*A*( H/L )
where K = media infiltration rate
A = Area
H = Total Head
L = Flow path length
Provided Bio Retetion Area Values
K =1.00 in/hr
A =24621 SF
H =4.67 ft
L=3.92 ft
Q =0.68 cfs
Safety Factor 10
Adjusted Q =6.8001 cfs
Minimum underdrain diameter Sizing
Q =6.8001 cfs
Slope =0.005 ft/ft
n 0.011 unitless
D =16.34 in
Use:16 lines of 4" underdrain pipe
or 8 lines of 6" underdrain pipe
CALCULATION TABLE
Equivalent Pipe Diameters at 0.5% slope
If D is less than No. of 4" diam No of 6" diam
4 2 6 2
5.657 3 8.485 3
6.928 4 10.392 4
8.000 5 12.000 5
8.944 6 13.416 6
9.798 7 14.697 7
10.583 8 15.875 8
11.314 9 16.971 9
12.000 10 18.000 10
12.649 11 18.974 11
13.253 12 19.900 12
Bio Retention Area Underdrain Pipe Sizing
Use Manning's Equation:
If D is less than
8/3
5.0
*16 

=S
nQD
223 S. West Street, Suite 1100, Raleigh, NC 27603 Tel [phone] Fax [phone] www.stewartinc.com Underdrains
Project: NCDA&CS Date: 9.19.2018 Revision:-
Project No:C16123 By:NBC
South Drainage Area to Stepped Bioretention
Input values in red
108,517 42,929
108,517 0
0 0
42,929
11,087
603
39,242
14,656
0
0
0
0
65,588
2.49 ac
1.51 ac
60.44 %
Design Rainfall 1.0 in
"Simple Method" Formula Rv = 0.05+0.009(I)
where
Rv=0.59 in/in
Controlled Volume Calculation Volume = (Design Rainfall) (Rv) (Drainage Area)
Volume =0.12 ac-ft
Volume =5371 cf <----- Total Volume Required to be Controlled (Storage)
On-site Drainage Area (sf)
On-site Sidewalks (sf)
Bioretention Area Sizing Runoff Volume - Simple Method
Drainage Area
Percent Impervious
This volume of runoff must be stored in the pond above the normal pool elevation and be
released in a draw down period of 2 to 5 days.
Rv = Runoff Coefficient = stormwater runoff (inches) /
stormwater rainfall (inches)
I = Percent Impervious = drainage area (acres) /
impervious portion of the drainage area (acres)
Impervious Area
Drainage Area
Off-site (sf)
Existing BUA* (sf)
Total Impervious Area (sf)
Off-site Drainage Area (sf)
Impervious Surface Area
On-site Buildings/Lots (sf)
On-site Streets (sf)
* = Report only amount of existing BUA that will reamain after
develoipment. Do not report any existing BUA that is to be removed and
which will be replaced by new BUA
On-site Parking (sf)
Pervious Surface Area
Managed Pervious Area (sf)
Unmanged Pervious Area (pasture) (sf)
Forest (sf)
Total Pervious Area (sf)
Total Drainage Area (sf)
Other On-site (sf)
Future (sf)
223 S. West Street, Suite 1100, Raleigh, NC 27603 Tel [phone] Fax [phone] www.stewartinc.com Design Volume - Simple
Project: NCDA&CS Date: 9.19.2018 Revision:-
Project No:C16123 By:NBC
South Drainage Area to Stepped Bioretention
Input values in red
108,517 42,929
108,517 0
0 0
42,929
11,087
603 98
39,242 61
14,656 61
0 58
0
0
0
65,588
2.49 ac
1.51 ac
60.44 %
Design Rainfall 1.0 in
"NRCS" Formula S = (1000/CN) - 10
Q* = [(P - 0.2S) ^2] / (P + 0.8S)
where
S=0.204
Q*=0.79 in/in
Controlled Volume Calculation Volume = (Design Rainfall) (Q*) (Drainage Area)
Volume =0.10 ac-ft
Volume =4323 cf <----- Total Volume Required to be Controlled (Storage)
Forest
* = Report only amount of existing BUA that will reamain after
develoipment. Do not report any existing BUA that is to be removed and
which will be replaced by new BUA
** = if CN of non-directly-connected drainage area is less than 64, MDC
allows assumption for zero runoff from this area. Therefore SCM water
quality volume only accounts for contributing runoff from impervious area.
Drainage Area
Impervious Area
Percent Impervious
P = Design rainfall (inches)
Q* = Runoff Depth (inches)
This volume of runoff must be stored in the bioretention area and be released in a draw down
period of 12 to 72 hours.
On-site Parking (sf)
On-site Sidewalks (sf)
Other On-site (sf)
Future (sf)
Off-site (sf)
Existing BUA* (sf)
Total Impervious Area (sf)
Managed Pervious Area, good condition **
Unmanged Pervious Area (pasture)
Off-site Drainage Area (sf)Forest (sf)
Total Pervious Area (sf)
Impervious Surface Area
On-site Buildings/Lots (sf)
On-site Streets (sf)
Curve Number by Landuse
Impervious area
Bioretention Area Sizing Runoff Volume - NRCS
Drainage Area Pervious Surface Area
Total Drainage Area (sf)Managed Pervious Area (sf)
On-site Drainage Area (sf)Unmanged Pervious Area (pasture) (sf)
223 S. West Street, Suite 1100, Raleigh, NC 27603 Tel [phone] Fax [phone] www.stewartinc.com Design Volume - NRCS
Project: NCDA&CS Date: 9.19.2018 Revision:-
Project No:C16123 By:NBC
Input values in red
Volume =5371 cf <----- Total Volume Required to be Controlled (Storage)
Required Surface Area
1.00 ft
Surface Area Calculation Surface Area = (Volume) / (Ponding Depth)
Surface Area 5,371 sf
Bio Retenion Area Volume Provided
Stage Level
Elevati
on (ft)
Area
(ft2)
Stage
Volum
e (ft3)
Cumulat
ive
Storage
(ft3)
0 439 5445 0 0
1 440 9071 7258 7258 OK
Drawdown Time
7258 cf
9071 sf
1.00 in/hr
Drain Time T = (Volume) / (Infiltration Rate) / (Surface Area)
T =9.60 hours
Ponding Depth
Facility Volume
Facility Surface Area
Media Infiltration Rate
Bio Retention Area Design Volume/Drawdown Time
223 S. West Street, Suite 1100, Raleigh, NC 27603 Tel [phone] Fax [phone] www.stewartinc.com Provided Volume
Project: NCDA&CS Date: 9.19.2018 Revision:-
Project No:C16123 By:NBC
Input values in red
Water Draw Through Rate:
Darcy's Equation:Q = (.0000232)*K*A*( H/L )
where K = media infiltration rate
A = Area
H = Total Head
L = Flow path length
Provided Bio Retetion Area Values
K =1.00 in/hr
A =9071 SF
H =4.67 ft
L=3.92 ft
Q =0.251 cfs
Safety Factor 10
Adjusted Q =2.5053 cfs
Minimum underdrain diameter Sizing
Q =2.5053 cfs
Slope =0.005 ft/ft
n 0.011 unitless
D =11.24 in
Use:8 lines of 4" underdrain pipe
or 4 lines of 6" underdrain pipe
CALCULATION TABLE
Equivalent Pipe Diameters at 0.5% slope
If D is less than No. of 4" diam No of 6" diam
4 2 6 2
5.651 3 8.485 3
6.921 4 10.392 4
7.992 5 12.000 5
8.935 6 13.416 6
9.788 7 14.697 7
10.572 8 15.875 8
11.302 9 16.971 9
11.988 10 18.000 10
12.636 11 18.974 11
13.253 12 19.900 12
Bio Retention Area Underdrain Pipe Sizing
Use Manning's Equation:
If D is less than
8/3
5.0
*16 

=S
nQD
223 S. West Street, Suite 1100, Raleigh, NC 27603 Tel [phone] Fax [phone] www.stewartinc.com Underdrains
PEAK FLOW ANALYSIS –
NC AGRICULTURAL SCIENCES CENTER STEWART

Page | 1

PEAK FLOW SUMMARY (CFS) 
Return 
Period 
Analysis 
Point PRE POST (no detention) 
POST with 
detention 
% 
CHANGE 
1 YR 
NORTH 5.38 24.79 4.98 ‐7.53% 
EAST 2.69 1.70   ‐36.65% 
SOUTH 4.61 9.75 4.56 ‐1.19% 
10 YR 
NORTH 34.17 65.29 55.64 62.84% 
EAST 10.70 6.50   ‐39.25% 
SOUTH 16.35 27.99 18.24 11.52% 

TIME 1YR PRE 1YR POST WITHOUT DETENTION 1YR POST WITH DETENTION 
0.0833 0.0000 0.0000 0.0000 
0.1667 0.0000 0.0000 0.0000 
0.2500 0.0000 0.0000 0.0000 
0.3333 0.0000 0.0000 0.0000 
0.4167 0.0000 0.0000 0.0000 
0.5000 0.0000 0.0000 0.0000 
0.5833 0.0000 0.0000 0.0000 
0.6667 0.0000 0.0000 0.0000 
0.7500 0.0000 0.0000 0.0000 
PEAK FLOW ANALYSIS –
NC AGRICULTURAL SCIENCES CENTER STEWART

Page | 41

TIME 
10YR 
PRE 10YR POST WITHOUT DETENTION 
10YR POST WITH 
DETENTION 
0.0833 0.0000 0.0002 0.0002 
0.1667 0.0000 0.0000 0.0000 
0.2500 0.0000 0.0000 0.0000 
0.3333 0.0000 0.0000 0.0000 
0.4167 0.0000 0.0000 0.0000 
0.5000 0.0000 0.0000 0.0000 
0.5833 0.0000 0.0000 0.0000 
0.6667 0.0000 0.0000 0.0000 
0.7500 0.0000 0.0000 0.0000 
0.8333 0.0000 0.0000 0.0000 
0.9167 0.0000 0.0000 0.0000 
1.0000 0.0000 0.0000 0.0000 
1.0833 0.0000 0.0000 0.0000 
1.1667 0.0000 0.0000 0.0000 
1.2500 0.0000 0.0000 0.0000 
1.3333 0.0000 0.0000 0.0000 
1.4167 0.0000 0.0000 0.0000 
1.5000 0.0000 0.0000 0.0000 
Project Date 2018.09.20
Project No.Designer NBC
Outlet ID
Outlet flowrate 12.44 cfs
Pipe diameter 24 inches EQUIVALENT PIPE AREA
Outlet pipe slope 1.02 percent
Full flow velocity 9.0 ft/sec
Zone from graph above =2
Outlet pipe diameter 24 in.Length =12.0 ft.
Outlet flowrate 12.4 cfs Width =6.0 ft.
Outlet velocity 9.0 ft/sec Stone diameter =6 in.
Material =Class B Thickness =22 in.
Zone Material Diameter Thickness Length Width
1 Class A 3 9 4 x D(o)3 x D(o)
2 Class B 6 22 6 x D(o)3 x D(o)
3 Class I 13 22 8 x D(o)3 x D(o)
4 Class I 13 22 8 x D(o)3 x D(o)
5 Class II 23 27 10 x D(o)3 x D(o)
6 Class II 23 27 10 x D(o)3 x D(o)
7
Calculations based on NY DOT method - Pages 8.06.05 through 8.06.06 in NC Erosion Control Manual
RIPRAP OUTLET PROTECTION WORKSHEET
NC Agricultural Science Center
C16123
HW-01
Special study required
9.0 ft/sec
0
5
10
15
20
25
0 1 2 3 4 5 6 7 8 9 10Velocity (ft/sec)Pipe diameter (ft)
Figure 8.06.b.1
Zone 1
Zone 2
Zone 3
Zone 4
Zone 5
Zone 6
Zone 7
223 S. West Street, Suite 1100, Raleigh, NC 27603 Tel [phone] Fax [phone] www.stewartinc.com
Project Date 2018.09.20
Project No.Designer NBC
Outlet ID
Outlet flowrate 47.22 cfs
Pipe diameter 30 inches EQUIVALENT PIPE AREA
Outlet pipe slope 1.13 percent
Full flow velocity 11.2 ft/sec
Zone from graph above =3
Outlet pipe diameter 30 in.Length =20.0 ft.
Outlet flowrate 47.2 cfs Width =7.5 ft.
Outlet velocity 11.2 ft/sec Stone diameter =13 in.
Material =Class I Thickness =22 in.
Zone Material Diameter Thickness Length Width
1 Class A 3 9 4 x D(o)3 x D(o)
2 Class B 6 22 6 x D(o)3 x D(o)
3 Class I 13 22 8 x D(o)3 x D(o)
4 Class I 13 22 8 x D(o)3 x D(o)
5 Class II 23 27 10 x D(o)3 x D(o)
6 Class II 23 27 10 x D(o)3 x D(o)
7
Calculations based on NY DOT method - Pages 8.06.05 through 8.06.06 in NC Erosion Control Manual
RIPRAP OUTLET PROTECTION WORKSHEET
NC Agricultural Science Center
C16123
HW-10
Special study required
11.2 ft/sec
0
5
10
15
20
25
0 1 2 3 4 5 6 7 8 9 10Velocity (ft/sec)Pipe diameter (ft)
Figure 8.06.b.1
Zone 1
Zone 2
Zone 3
Zone 4
Zone 5
Zone 6
Zone 7
223 S. West Street, Suite 1100, Raleigh, NC 27603 Tel [phone] Fax [phone] www.stewartinc.com
Project Date 2018.09.20
Project No.Designer NBC
Outlet ID
Outlet flowrate 28.93 cfs
Pipe diameter 30 inches EQUIVALENT PIPE AREA
Outlet pipe slope 1 percent
Full flow velocity 7.0 ft/sec
Zone from graph above =2
Outlet pipe diameter 30 in.Length =15.0 ft.
Outlet flowrate 28.9 cfs Width =7.5 ft.
Outlet velocity 7.0 ft/sec Stone diameter =6 in.
Material =Class B Thickness =22 in.
Zone Material Diameter Thickness Length Width
1 Class A 3 9 4 x D(o)3 x D(o)
2 Class B 6 22 6 x D(o)3 x D(o)
3 Class I 13 22 8 x D(o)3 x D(o)
4 Class I 13 22 8 x D(o)3 x D(o)
5 Class II 23 27 10 x D(o)3 x D(o)
6 Class II 23 27 10 x D(o)3 x D(o)
7
Calculations based on NY DOT method - Pages 8.06.05 through 8.06.06 in NC Erosion Control Manual
RIPRAP OUTLET PROTECTION WORKSHEET
NC Agricultural Science Center
C16123
HW-20
Special study required
7.0 ft/sec
0
5
10
15
20
25
0 1 2 3 4 5 6 7 8 9 10Velocity (ft/sec)Pipe diameter (ft)
Figure 8.06.b.1
Zone 1
Zone 2
Zone 3
Zone 4
Zone 5
Zone 6
Zone 7
223 S. West Street, Suite 1100, Raleigh, NC 27603 Tel [phone] Fax [phone] www.stewartinc.com
Project Date 2018.09.20
Project No.Designer NBC
Outlet ID
Outlet flowrate 19.16 cfs
Pipe diameter 30 inches EQUIVALENT PIPE AREA
Outlet pipe slope 0.95 percent
Full flow velocity 6.3 ft/sec
Zone from graph above =2
Outlet pipe diameter 30 in.Length =15.0 ft.
Outlet flowrate 19.2 cfs Width =7.5 ft.
Outlet velocity 6.3 ft/sec Stone diameter =6 in.
Material =Class B Thickness =22 in.
Zone Material Diameter Thickness Length Width
1 Class A 3 9 4 x D(o)3 x D(o)
2 Class B 6 22 6 x D(o)3 x D(o)
3 Class I 13 22 8 x D(o)3 x D(o)
4 Class I 13 22 8 x D(o)3 x D(o)
5 Class II 23 27 10 x D(o)3 x D(o)
6 Class II 23 27 10 x D(o)3 x D(o)
7
Calculations based on NY DOT method - Pages 8.06.05 through 8.06.06 in NC Erosion Control Manual
RIPRAP OUTLET PROTECTION WORKSHEET
NC Agricultural Science Center
C16123
HW-40
Special study required
6.3 ft/sec
0
5
10
15
20
25
0 1 2 3 4 5 6 7 8 9 10Velocity (ft/sec)Pipe diameter (ft)
Figure 8.06.b.1
Zone 1
Zone 2
Zone 3
Zone 4
Zone 5
Zone 6
Zone 7
223 S. West Street, Suite 1100, Raleigh, NC 27603 Tel [phone] Fax [phone] www.stewartinc.com
Project Date 2018.09.20
Project No.Designer NBC
Outlet ID
Outlet flowrate 6.34 cfs
Pipe diameter 18 inches EQUIVALENT PIPE AREA
Outlet pipe slope 0.6 percent
Full flow velocity 4.7 ft/sec
Zone from graph above =1
Outlet pipe diameter 18 in.Length =6.0 ft.
Outlet flowrate 6.3 cfs Width =4.5 ft.
Outlet velocity 4.7 ft/sec Stone diameter =3 in.
Material =Class A Thickness =9 in.
Zone Material Diameter Thickness Length Width
1 Class A 3 9 4 x D(o)3 x D(o)
2 Class B 6 22 6 x D(o)3 x D(o)
3 Class I 13 22 8 x D(o)3 x D(o)
4 Class I 13 22 8 x D(o)3 x D(o)
5 Class II 23 27 10 x D(o)3 x D(o)
6 Class II 23 27 10 x D(o)3 x D(o)
7
Calculations based on NY DOT method - Pages 8.06.05 through 8.06.06 in NC Erosion Control Manual
RIPRAP OUTLET PROTECTION WORKSHEET
NC Agricultural Science Center
C16123
HW-60
Special study required
4.7 ft/sec
0
5
10
15
20
25
0 1 2 3 4 5 6 7 8 9 10Velocity (ft/sec)Pipe diameter (ft)
Figure 8.06.b.1
Zone 1
Zone 2
Zone 3
Zone 4
Zone 5
Zone 6
Zone 7
223 S. West Street, Suite 1100, Raleigh, NC 27603 Tel [phone] Fax [phone] www.stewartinc.com
Project Date 2018.09.20
Project No.Designer NBC
Outlet ID
Outlet flowrate 5.53 cfs
Pipe diameter 15 inches EQUIVALENT PIPE AREA
Outlet pipe slope 1 percent
Full flow velocity 4.8 ft/sec
Zone from graph above =2
Outlet pipe diameter 15 in.Length =7.5 ft.
Outlet flowrate 5.5 cfs Width =3.8 ft.
Outlet velocity 4.8 ft/sec Stone diameter =6 in.
Material =Class B Thickness =22 in.
Zone Material Diameter Thickness Length Width
1 Class A 3 9 4 x D(o)3 x D(o)
2 Class B 6 22 6 x D(o)3 x D(o)
3 Class I 13 22 8 x D(o)3 x D(o)
4 Class I 13 22 8 x D(o)3 x D(o)
5 Class II 23 27 10 x D(o)3 x D(o)
6 Class II 23 27 10 x D(o)3 x D(o)
7
Calculations based on NY DOT method - Pages 8.06.05 through 8.06.06 in NC Erosion Control Manual
RIPRAP OUTLET PROTECTION WORKSHEET
NC Agricultural Science Center
C16123
HW-34
Special study required
4.8 ft/sec
0
5
10
15
20
25
0 1 2 3 4 5 6 7 8 9 10Velocity (ft/sec)Pipe diameter (ft)
Figure 8.06.b.1
Zone 1
Zone 2
Zone 3
Zone 4
Zone 5
Zone 6
Zone 7
223 S. West Street, Suite 1100, Raleigh, NC 27603 Tel [phone] Fax [phone] www.stewartinc.com
Project Date 2018.09.20
Project No.Designer NBC
Outlet ID
Outlet flowrate 16.24 cfs
Pipe diameter 24 inches EQUIVALENT PIPE AREA
Outlet pipe slope 3.42 percent
Full flow velocity 11.0 ft/sec
Zone from graph above =2
Outlet pipe diameter 24 in.Length =12.0 ft.
Outlet flowrate 16.2 cfs Width =6.0 ft.
Outlet velocity 11.0 ft/sec Stone diameter =6 in.
Material =Class B Thickness =22 in.
Zone Material Diameter Thickness Length Width
1 Class A 3 9 4 x D(o)3 x D(o)
2 Class B 6 22 6 x D(o)3 x D(o)
3 Class I 13 22 8 x D(o)3 x D(o)
4 Class I 13 22 8 x D(o)3 x D(o)
5 Class II 23 27 10 x D(o)3 x D(o)
6 Class II 23 27 10 x D(o)3 x D(o)
7
Calculations based on NY DOT method - Pages 8.06.05 through 8.06.06 in NC Erosion Control Manual
RIPRAP OUTLET PROTECTION WORKSHEET
NC Agricultural Science Center
C16123
Existing South Outlet
Special study required
11.0 ft/sec
0
5
10
15
20
25
0 1 2 3 4 5 6 7 8 9 10Velocity (ft/sec)Pipe diameter (ft)
Figure 8.06.b.1
Zone 1
Zone 2
Zone 3
Zone 4
Zone 5
Zone 6
Zone 7
223 S. West Street, Suite 1100, Raleigh, NC 27603 Tel [phone] Fax [phone] www.stewartinc.com
Existing Conditions
Protected Open 25.16 ac
Managed Open 14.70 ac
Impervious 0.26 ac
Total Project Area 40.12 ac
Proposed Conditions
Protected Open 25.16 ac
Managed Open 7.59 ac
Impervious 7.36 ac
Total Project Area 40.12 ac
Site Data Analysis - Nitrogen Calculations
(Based upon total Parcel Area + ROW)
Project:North Carolina Agricultural Sciences Center
Number:C16123
Date:12-Sep-18
Total Parcel Area =40.12 ac
Existing Imperious Area =0.26 ac
Existing Open Space =39.86 ac
Additional Proposed Impervious Area =7.102 ac
Total Proposed Impervious Area =7.36 ac
Remaining Open Space =32.76 ac
"area" of new development =38.7122 ac (Add. Prop imp + apprortioned open space)Min. Nitrogen to be removed from site =49.13 lb/yr (Tot. Prop. Export-3.6)*"area" of new develop.)
to meet 3.6 lb/ac/yr for new "area"
Apportioned open space =31.6104 ac (ex. imp/prop. Imp*remaining open space)
Minimum area of imp. To bioretention =6.621 ac (TN to be removed/0.35/21.2)
Proposed Nitrogen Load =188.490 lb/yr
Min. Nitrogen to be removed from site =-198.63 lb/yr (Tot. Prop. Export-3.6)*"area" of new develop.)
Total Proposed Nitrogen Export =4.87 lb/ac/yr (Prop. Nitrogen Load/"area" of new develop.)to meet 10 lb/ac/yr for new "area"
for "area" of new development
Minimum area of imp. to bioretention =-26.770 ac (TN to be removed/0.35/21.2)
Total Prop. Nitrogen Export for "area" of new development with Treatment
Removal by BMP
Drainage area to BMP 11.420 ac
Effective removal rate 35%
Proposed Nitrogen Export with Treatment
Total TN Export Treatment TN Export
Area Amount Reduced
(ac)(lbs/yr)lbs/yr (lbs/yr)
To BMP 11.420 163.203 57.121 106.082
Remaining Site 21.534 17.040 0.000 17.040
Total Area =32.954 123.122
Proposed Nitrogen Load =188.490 lb/yr
Total Nitrogen removed by BMP =57.121 lb/yr
Prop. Nitrogen Load with treatment =131.369 lb/yr
Total Proposed Nitrogen Export =3.39 lb/ac/yr
for "area" of new development
with treatment
Buydown Payment Calculation
Nitrogen Limit =3.6 lbs/ac/yr
Total Parcel Area =38.71 ac
Total Nitrogen Export =3.39 lbs/ac/yr
Payment =$850.50 ac/lbs
Payment =$0.00
[(Add. prop imp*21.2)+(app. open space*1.2)]
"area" of new development
Total Nitrogen Export
(Using Apportioning Method)
Step 1: Determine area for each type of land use and enter in Column (2).
Step 2: Total the areas for each type of land use and enter at the bottom of Column (2).
Step 3: Multiply the areas in Column (2) by the TN export Coefficients in Column (3) and enter
in Column (4).
Step 4: Total the TN exports for each type of land use and enter at the bottom of Column (4).
Step 5: Determine the export coefficient for site by dividing the total TN export from uses at the
bottom of Column (4) by the area at the bottom of Column (2).
(1)(2)(3)(4)
Type of Land Cover Areas TN export coefficient TN export from use
(acres)(lbs/ac/yr)(lbs/yr)
Permanently protected 25.164 0.60 15.099
undisturbed open space
(forest, unmown meadow)
Permanently protected 14.697 1.2 17.637
open space
(grass, landscaping, etc.)
Impervious surfaces 0.258 21.2 5.475
(roads, parking lots,
driveways, roofs, paved
storage areas, etc.)
TOTAL 40.120 ---38.211
Total Nitrogen Export =0.95 lb/ac/yr
Existing Nitrogen Runoff Calculations
Total Parcel
Step 1: Determine area for each type of land use and enter in Column (2).
Step 2: Total the areas for each type of land use and enter at the bottom of Column (2).
Step 3: Multiply the areas in Column (2) by the TN export Coefficients in Column (3) and enter
in Column (4).
Step 4: Total the TN exports for each type of land use and enter at the bottom of Column (4).
Step 5: Determine the export coefficient for site by dividing the total TN export from uses at the
bottom of Column (4) by the area at the bottom of Column (2).
(1)(2)(3)(4)
Type of Land Cover Areas TN export coefficient TN export from use
(acres)(lbs/ac/yr)(lbs/yr)
Permanently protected 25.164 0.60 15.099
undisturbed open space
(forest, unmown meadow)
Permanently protected 7.593 1.2 9.112
open space
(grass, landscaping, etc.)
Impervious surfaces 7.360 21.2 156.033
(roads, parking lots,
driveways, roofs, paved
storage areas, etc.)
TOTAL 40.118 ---180.243
Total Nitrogen Export =4.49 lb/ac/yr
Proposed Nitrogen Runoff Calculations
Total Parcel - BEFORE TREATMENT
Step 1: Determine area for each type of land use and enter in Column (2).
Step 2: Total the areas for each type of land use and enter at the bottom of Column (2).
Step 3: Multiply the areas in Column (2) by the TN export Coefficients in Column (3) and enter
in Column (4).
Step 4: Total the TN exports for each type of land use and enter at the bottom of Column (4).
Step 5: Determine the export coefficient for site by dividing the total TN export from uses at the
bottom of Column (4) by the area at the bottom of Column (2).
(1)(2)(3)(4)
Type of Land Cover Areas TN export coefficient TN export from use
(acres)(lbs/ac/yr)(lbs/yr)
Permanently protected 7.163 0.60 4.298
undisturbed open space
(forest, unmown meadow)
Permanently protected 4.160 1.2 4.992
open space
(grass, landscaping, etc.)
Impervious surfaces 7.260 21.2 153.913
(roads, parking lots,
driveways, roofs, paved
storage areas, etc.)
TOTAL 11.420 ---163.203
Total Nitrogen Export =14.29 lb/ac/yr
Proposed Nitrogen Runoff Calculations
To BMP
Step 1: Determine area for each type of land use and enter in Column (2).
Step 2: Total the areas for each type of land use and enter at the bottom of Column (2).
Step 3: Multiply the areas in Column (2) by the TN export Coefficients in Column (3) and enter
in Column (4).
Step 4: Total the TN exports for each type of land use and enter at the bottom of Column (4).
Step 5: Determine the export coefficient for site by dividing the total TN export from uses at the
bottom of Column (4) by the area at the bottom of Column (2).
(1)(2)(3)(4)
Type of Land Cover Areas TN export coefficient TN export from use
(acres)(lbs/ac/yr)(lbs/yr)
Permanently protected 18.001 0.60 10.801
undisturbed open space
(forest, unmown meadow)
Permanently protected 3.433 1.2 4.120
open space
(grass, landscaping, etc.)
Impervious surfaces 0.100 21.2 2.120
(roads, parking lots,
driveways, roofs, paved
storage areas, etc.)
TOTAL 21.534 ---17.040
Total Nitrogen Export =0.79 lb/ac/yr
Proposed Nitrogen Runoff Calculations
Remaining portion of parcel with NO TREATMENT

Appendix 4

Stormwater Drawings
a. SW1.0- Pre-Development Land Use
b. SW2.0- Post-Development Land Use
c. SW3.0- Pre-Development Drainage Area
d. SW4.0- Post-Development Drainage
Area

GVWVWVWVWVWVF
F
=
4
4
7
.
4
1
'
FF=438.26'FF=433.76'FF=436.90'14QR14QR14QR14QR14AR10AR10AR8AR12AR8AR6AR10AR10AR24AR28AR24AR24AR14QR14QR14QR20QR8QR14QR18QR8QR16QR16QR24QR12QR6QR12QR12QR16QR42LS36QA48QA5PY5PY6PT9PT3CF4PY4LS6LS7PT3PY3PY6TREE5TREE5TREE8TREE7TREE40QA40QA30QA30QR8TREE8TREE8TREE40QR4JV3AR7TREE5TREE7TREE22LS8QP26LS15LS4PY5PY4QRVAULT36QA40QA12JV40QA34QAG
A
T
E GATEGATEGATEGA
T
E GATECONTROL POINTN:751803.84'E:2085432.48'EL:428.28'EDWARDS MILL ROADSR 3009VARIABLE WIDTH PUBLIC R/WREEDY CREEK ROADVARIABLE WIDTH PUBLIC R/WREEDY CREEK ROADVARIABLE WIDTH PUBLIC R/WWOODEDAREAWOODEDAREAWOODEDAREAWOODEDAREAWOODEDAREAWOODEDAREAWOODEDAREAWOODEDAREAWOODEDAREAWOODEDAREAWOODEDAREAGIS ZONING LINE"AP""OX-3"GIS ZONING LINE"AP""OX-3"15"RCP15"RCP15"RCP8"PVC4"PVC8"PVC8"PVC
8"
P
V
C 15"RCP24"RCP24"RCP24"RCPTOC=434.52'IN=429.32'OUT=429.12'TOC=435.19'IN=428.89'OUT=428.69'15"RCPTOC=408.90'OUT=404.70'15"RCPTOC=399.70'IN(15")=394.10'IN(18")=394.20'OUT=393.95'TOC=400.42'OUT=395.82'INV=420.14'18
"
R
C
PTOC=408.12'IN=403.12'OUT=402.72'GWPGATETOC=446.46'OUT=441.31'15"RCPTOC=441.89'IN=432.89'OUT=432.29'INV=429.62'24
"
R
C
P
INV=433.29'INV=436.90'TOC=442.72'OUT=437.77'TOC=444.89'IN(4")=441.29'IN(15")=437.09'OUT=436.89'INV=435.98'RIM=444.83'IN(4")=439.43'IN(8")=440.15'IN(15")=437.93'OUT=437.73'RIM=444.98'IN=439.18'IN=439.18'OUT=438.88'SIGNSIGNTPEDGRAVELRWMEIREIREIPRWMS49°11'35"W 585.30'N60°48'20"W 169.00'N09°54'07"W 120.90'N32°32'49"E 57.90'
N
3
2
°
2
9
'
2
3
"
EC1C2L1L2
N50°51'53"WRWMASPHALT
SIGNGATEEE
E
15"RCPASPHALTPARKINGASPHALTPARKINGASPHALTPARKINGRIPRAPFEEDERPADFEEDERPAD4' WIREFENCE4' WIREFENCE4' WIREFENCE4' WIREFENCE4' WIREFENCE4' WIREFENCE4' WIREFENCE4' WIREFENCE4' WIREFENCE4' WIREFENCE4' WIREFENCE4' WIREFENCE4' WIREFENCE4' WIREFENCE4' WIREFENCE4' WIREFENCE4' WIREFENCE4' WIREFENCE4' WIREFENCESPIGOT8"PVC15"RCP8"PVC8"PVCRIM=391.78'IN=381.48'OUT=381.46'RIM=391.93'IN=384.93'OUT=383.07'S60°48'20"E76.65'TPEDN50°51'53"WTIMBER
TIMBER 15"RCPTOC=398.48'OUT=394.38'TOC=398.47'IN=394.37'OUT=394.17'TOC=397.93'IN(15")=392.83'IN(24")=392.83'OUT=392.63'24
"
R
C
P
24
"
R
C
P
WOODEDAREA - SR 1775SOUTHWEST TOP OFBANK PROVIDED BYSTEWART SURVEYCOMPLETED ON03.23.2017ZONE 1 AND ZONE 2BUFFER BASED ONESTIMATED NORTHEASTTOP OF BANK20.00' ZONE 2 STREAM BUFFER30.00' ZONE 1 STREAM BUFFER
2
0
.
0
0
'30.00
'PROJECT BOUNDARY40.03 ACRESDATE ISSUEDSHEETJOB NUMBER520 SOUTH HARRINGTON STREET RALEIGH, NC 27601
919.828.2301 919.828.2303 (FAX) [e-mail]
These drawings are the property of HH Architecture, P.A. They may not be used for any purpose without written permission. Copyright 2016 by HH Architecture, P.A. All rights reserved.PROJECT STATUSNORTH CAROLINA AGRICULTURAL SCIENCES CENTER
NORTH CAROLINA DEPARTMENT OF AGRICULTURE AND CONSUMER SERVICES
4600 REEDY CREEK ROAD, RALEIGH NCNCDEQ STORMWATERSCO# 16-14380-02BNO.REVISIONDATEFIRM LICENSE #: C-1051www.stewartinc.comPROJECT #: 16123223 S. WEST ST, SUITE 1100RALEIGH, NC 27603T 919.380.87501COMMENTS11.07.18FOR REVIEW ONLYFF=267.18'SURVEY CONTROL POINTEXISTING IRON PIPEEXISTING CONCRETE MONUMENTSTORM DRAIN MANHOLESANITARY SEWER MANHOLEHYDRANTWATER VALVEWATER METERWATER MANHOLEGAS VALVEGAS METERTELEPHONE MANHOLETELEPHONE PEDESTALTV MANHOLETV PEDESTALELECTRIC MANHOLEELECTRIC BOXUTILITY POLEGUY WIRELIGHT POLETRAFFIC SIGNAL BOXBOLLARDSIGNFINISHED FLOOR ELEVATIONUNDERGROUND TELEPHONE LINEUNDERGROUND FIBER OPTIC LINEUNDERGROUND GAS LINEUNDERGROUND ELECTRIC LINEUNDERGROUND WATER LINESANITARY SEWER LINESTORM DRAIN LINEOVERHEAD WIRESUNIDENTIFIED LINEEIPECMDIPPVCHDPERCPCMPCBTFOGEWSSOHWUDUCTILE IRON PIPEPOLYVINYL CHLORIDE PIPEHIGH-DENSITY POLYETHYLENE PIPEREINFORCED CONCRETE PIPECORRUGATED METAL PIPECATCH BASINCATVTPEDGMWMTRAFFIC SIGNAL POSTGVELECTRIC METERUNKNOWN DESTINATIONFIBER OPTIC WITNESS POSTBORING LOCATIONSTORM DRAIN CURB INLETCOMPUTED POINTFIBER OPTIC BOXGUY POLEMANHOLEDECIDUOUS TREEEVERGREEN TREEBUSHWIRE FENCECHAIN LINK FENCECONCRETE SURFACEWVFOWPEMBORIOLIAMERICAN HOLLYCREPE MYRTLEPOPTQREASTERN SYCAMORELOBLOLLY PINERED OAKEXAMPLE: 10QR = 10" RED OAKMGSOUTHERN MAGNOLIAJVEASTERN RED CEDARSURVEY TREE LEGEND:SURVEY LEGEND:SW1.0EXISTINGLAND USEC1612311.07.20180501002001"= 100'SCALE:NORTHABBREVIATIONS:PROJECT AREA = 40.03 ACEXISTING IMPERVIOUSWITHIN PROJECT AREA =11,250 SF (0.258 AC)EXISTING PROJECT AREA =0.645% IMPERVIOUSPARKINGBUILDING
LDLDLD LDLDLDLDLDLDLD
LDLDLDLD
L
D
LD
LD
LD
LD
LD LDLD
LD
L
D
LDLDLDLDLDLD
LDLDPI
VFDC TPTPTP
TP
TP
TPTPTPTPTPTP
TPGVWVWVWVWVWVF
F
=
4
4
7
.
4
1
'14QR14QR14QR14QR14AR8AR6AR10AR10AR24AR28AR24AR24AR14QR14QR14QR20QR8QR14QR18QR8QR16QR16QR6QR12QR12QR42LS36QA48QA6TREE5TREE5TREE8TREE7TREE40QA40QA30QA30QR8TREE8TREE8TREE40QR22LS8QP4PY5PY4QR36QA40QA40QA34QAEDWARDS MILL ROADSR 3009VARIABLE WIDTH PUBLIC R/WREEDY CREEK ROADVARIABLE WIDTH PUBLIC R/WREEDY CREEK ROADVARIABLE WIDTH PUBLIC R/WWOODEDAREAWOODEDAREAWOODEDAREAWOODEDAREAWOODEDAREAWOODEDAREAWOODEDAREAWOODEDAREAGIS ZONING LINE"AP""OX-3"GIS ZONING LINE"AP""OX-3"15"RCP15"RCP
8"PVC4"PVC8"PVC8"PVC
8"
P
V
C 15"RCP24"RCP24"RCP24"RCPTOC=434.52'IN=429.32'OUT=429.12'15"RCPTOC=408.90'OUT=404.70'15"RCPTOC=399.70'IN(15")=394.10'IN(18")=394.20'OUT=393.95'TOC=400.42'OUT=395.82'18
"
R
C
PTOC=408.12'IN=403.12'OUT=402.72'GWPTOC=446.46'OUT=441.31'15"RCPTOC=441.89'IN=432.89'OUT=432.29'INV=429.62'24
"
R
C
P
INV=433.29'TOC=442.72'OUT=437.77'TOC=444.89'IN(4")=441.29'IN(15")=437.09'OUT=436.89'INV=435.98'RIM=444.83'IN(4")=439.43'IN(8")=440.15'IN(15")=437.93'OUT=437.73'RIM=444.98'IN=439.18'IN=439.18'OUT=438.88'SIGNTPEDRWMEIREIREIPRWMS49°11'35"W 585.30'N60°48'20"W 169.00'N09°54'07"W 120.90'N32°32'49"E 57.90'
N
3
2
°
2
9
'
2
3
"
EC1C2L1L2
N50°51'53"WRWMASPHALT
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15"RCPASPHALTPARKINGASPHALTPARKING4' WIREFENCE4' WIREFENCE8"PVC15"RCP8"PVC8"PVCRIM=391.78'IN=381.48'OUT=381.46'RIM=391.93'IN=384.93'OUT=383.07'S60°48'20"E76.65'TPEDN50°51'53"W15"RCPTOC=398.48'OUT=394.38'TOC=398.47'IN=394.37'OUT=394.17'TOC=397.93'IN(15")=392.83'IN(24")=392.83'OUT=392.63'24
"
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"
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WOODEDAREA - SR 1775SOUTHWEST TOP OFBANK PROVIDED BYSTEWART SURVEYCOMPLETED ON03.23.2017ZONE 1 AND ZONE 2BUFFER BASED ONESTIMATED NORTHEASTTOP OF BANK20.00' ZONE 2 STREAM BUFFER30.00' ZONE 1 STREAM BUFFER
2
0
.
0
0
'30.00
'PROJECT BOUNDARY40.12 ACRESDATE ISSUEDSHEETJOB NUMBER520 SOUTH HARRINGTON STREET RALEIGH, NC 27601
919.828.2301 919.828.2303 (FAX) [e-mail]
These drawings are the property of HH Architecture, P.A. They may not be used for any purpose without written permission. Copyright 2016 by HH Architecture, P.A. All rights reserved.PROJECT STATUSNORTH CAROLINA AGRICULTURAL SCIENCES CENTER
NORTH CAROLINA DEPARTMENT OF AGRICULTURE AND CONSUMER SERVICES
4600 REEDY CREEK ROAD, RALEIGH NCNCDEQ STORMWATERSCO# 16-14380-02BNO.REVISIONDATEFIRM LICENSE #: C-1051www.stewartinc.comPROJECT #: 16123223 S. WEST ST, SUITE 1100RALEIGH, NC 27603T 919.380.87501COMMENTS11.07.18FOR REVIEW ONLYFF=267.18'SURVEY CONTROL POINTEXISTING IRON PIPEEXISTING CONCRETE MONUMENTSTORM DRAIN MANHOLESANITARY SEWER MANHOLEHYDRANTWATER VALVEWATER METERWATER MANHOLEGAS VALVEGAS METERTELEPHONE MANHOLETELEPHONE PEDESTALTV MANHOLETV PEDESTALELECTRIC MANHOLEELECTRIC BOXUTILITY POLEGUY WIRELIGHT POLETRAFFIC SIGNAL BOXBOLLARDSIGNFINISHED FLOOR ELEVATIONUNDERGROUND TELEPHONE LINEUNDERGROUND FIBER OPTIC LINEUNDERGROUND GAS LINEUNDERGROUND ELECTRIC LINEUNDERGROUND WATER LINESANITARY SEWER LINESTORM DRAIN LINEOVERHEAD WIRESUNIDENTIFIED LINEEIPECMDIPPVCHDPERCPCMPCBTFOGEWSSOHWUDUCTILE IRON PIPEPOLYVINYL CHLORIDE PIPEHIGH-DENSITY POLYETHYLENE PIPEREINFORCED CONCRETE PIPECORRUGATED METAL PIPECATCH BASINCATVTPEDGMWMTRAFFIC SIGNAL POSTGVELECTRIC METERUNKNOWN DESTINATIONFIBER OPTIC WITNESS POSTBORING LOCATIONSTORM DRAIN CURB INLETCOMPUTED POINTFIBER OPTIC BOXGUY POLEMANHOLEDECIDUOUS TREEEVERGREEN TREEBUSHWIRE FENCECHAIN LINK FENCECONCRETE SURFACEWVFOWPEMBORIOLIAMERICAN HOLLYCREPE MYRTLEPOPTQREASTERN SYCAMORELOBLOLLY PINERED OAKEXAMPLE: 10QR = 10" RED OAKMGSOUTHERN MAGNOLIAJVEASTERN RED CEDARSURVEY TREE LEGEND:SURVEY LEGEND:SW2.0PROPOSEDLAND USEC1612311.07.20180501002001"= 100'SCALE:NORTHABBREVIATIONS:PROJECT AREA = 40.12 ACPROPOSED IMPERVIOUSWITHIN PROJECT AREA =320,603 SF (7.36 AC)PROPOSED PROJECT AREA= 18.29% IMPERVIOUSSIDEWALK/ WALLSROADPARKINGBUILDING
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"
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"
R
C
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INV=433.29'INV=436.90'TOC=442.72'OUT=437.77'TOC=444.89'IN(4")=441.29'IN(15")=437.09'OUT=436.89'INV=435.98'RIM=444.83'IN(4")=439.43'IN(8")=440.15'IN(15")=437.93'OUT=437.73'RIM=444.98'IN=439.18'IN=439.18'OUT=438.88'SIGNSIGNTPEDGRAVELRWMEIREIRRWMS49°11'35"W 585.30'N60°48'20"W 169.00'N09°54'07"W 120.90'N32°32'49"E 57.90'
N
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EC1C2L1L2
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SIGNGATEEE
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TIMBER
WOODEDAREA - SR 1775SOUTHWEST TOP OFBANK PROVIDED BYSTEWART SURVEYCOMPLETED ON03.23.2017ZONE 1 AND ZONE 2BUFFER BASED ONESTIMATED NORTHEASTTOP OF BANK20.00' ZONE 2 STREAM BUFFER30.00' ZONE 1 STREAM BUFFER
2
0
.
0
0
'30.00
'
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DD TIME OF CONCENTRATIONFLOW PATHDDDDDDDDDDDDDDTIME OF CONCENTRATIONFLOW PATHDDDDDDDDTIME OFCONCENTRATIONFLOW PATHDATE ISSUEDSHEETJOB NUMBER520 SOUTH HARRINGTON STREET RALEIGH, NC 27601
919.828.2301 919.828.2303 (FAX) [e-mail]
These drawings are the property of HH Architecture, P.A. They may not be used for any purpose without written permission. Copyright 2016 by HH Architecture, P.A. All rights reserved.PROJECT STATUSNORTH CAROLINA AGRICULTURAL SCIENCES CENTER
NORTH CAROLINA DEPARTMENT OF AGRICULTURE AND CONSUMER SERVICES
4600 REEDY CREEK ROAD, RALEIGH NCNCDEQ STORMWATERSCO# 16-14380-02BNO.REVISIONDATEFIRM LICENSE #: C-1051www.stewartinc.comPROJECT #: 16123223 S. WEST ST, SUITE 1100RALEIGH, NC 27603T 919.380.87501COMMENTS11.07.18FOR REVIEW ONLYFF=267.18'SURVEY CONTROL POINTEXISTING IRON PIPEEXISTING CONCRETE MONUMENTSTORM DRAIN MANHOLESANITARY SEWER MANHOLEHYDRANTWATER VALVEWATER METERWATER MANHOLEGAS VALVEGAS METERTELEPHONE MANHOLETELEPHONE PEDESTALTV MANHOLETV PEDESTALELECTRIC MANHOLEELECTRIC BOXUTILITY POLEGUY WIRELIGHT POLETRAFFIC SIGNAL BOXBOLLARDSIGNFINISHED FLOOR ELEVATIONUNDERGROUND TELEPHONE LINEUNDERGROUND FIBER OPTIC LINEUNDERGROUND GAS LINEUNDERGROUND ELECTRIC LINEUNDERGROUND WATER LINESANITARY SEWER LINESTORM DRAIN LINEOVERHEAD WIRESUNIDENTIFIED LINEEIPECMDIPPVCHDPERCPCMPCBTFOGEWSSOHWUDUCTILE IRON PIPEPOLYVINYL CHLORIDE PIPEHIGH-DENSITY POLYETHYLENE PIPEREINFORCED CONCRETE PIPECORRUGATED METAL PIPECATCH BASINCATVTPEDGMWMTRAFFIC SIGNAL POSTGVELECTRIC METERUNKNOWN DESTINATIONFIBER OPTIC WITNESS POSTBORING LOCATIONSTORM DRAIN CURB INLETCOMPUTED POINTFIBER OPTIC BOXGUY POLEMANHOLEDECIDUOUS TREEEVERGREEN TREEBUSHWIRE FENCECHAIN LINK FENCECONCRETE SURFACEWVFOWPEMBORIOLIAMERICAN HOLLYCREPE MYRTLEPOPTQREASTERN SYCAMORELOBLOLLY PINERED OAKEXAMPLE: 10QR = 10" RED OAKMGSOUTHERN MAGNOLIAJVEASTERN RED CEDARSURVEY TREE LEGEND:SURVEY LEGEND:SW3.0EXISTINGDRAINAGE AREAC1612311.07.2018030601201"= 60'SCALE:NORTHABBREVIATIONS:NORTH DRAINAGE AREA12.315 ACEAST DRAINAGE AREA4.130 ACSOUTH DRAINAGE AREA3.786 ACIMPERVIOUS AREA
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'14QR14QR14QR14QR14AR8AR6AR10AR10AR24AR28AR24AR24AR14QR14QR14QR20QR8QR14QR18QR8QR16QR16QR6QR12QR12QR42LS36QA48QA6TREE5TREE5TREE8TREE7TREE40QA40QA30QA30QR8TREE8TREE8TREE40QR22LS8QP4PY5PY4QR36QA40QA40QA34QAEDWARDS MILL ROADSR 3009VARIABLE WIDTH PUBLIC R/WREEDY CREEK ROADVARIABLE WIDTH PUBLIC R/WREEDY CREEK ROADVARIABLE WIDTH PUBLIC R/WWOODEDAREAWOODEDAREAWOODEDAREAWOODEDAREAWOODEDAREAWOODEDAREAWOODEDAREAWOODEDAREAGIS ZONING LINE"AP""OX-3"GIS ZONING LINE"AP""OX-3"15"RCP15"RCP
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"
R
C
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INV=433.29'TOC=442.72'OUT=437.77'TOC=444.89'IN(4")=441.29'IN(15")=437.09'OUT=436.89'INV=435.98'RIM=444.83'IN(4")=439.43'IN(8")=440.15'IN(15")=437.93'OUT=437.73'RIM=444.98'IN=439.18'IN=439.18'OUT=438.88'SIGNTPEDRWMEIREIRRWMS49°11'35"W 585.30'N60°48'20"W 169.00'N09°54'07"W 120.90'N32°32'49"E 57.90'
N
3
2
°
2
9
'
2
3
"
EC1C2L1L2
N50°51'53"WRWMASPHALT
SIGNGATEEE
E
15"RCPASPHALTPARKINGASPHALTPARKING4' WIREFENCE4' WIREFENCES60°48'20"E76.65'TPEDN50°51'53"WWOODEDAREA - SR 1775SOUTHWEST TOP OFBANK PROVIDED BYSTEWART SURVEYCOMPLETED ON03.23.2017ZONE 1 AND ZONE 2BUFFER BASED ONESTIMATED NORTHEASTTOP OF BANK20.00' ZONE 2 STREAM BUFFER30.00' ZONE 1 STREAM BUFFER
2
0
.
0
0
'30.00
'NORTH ANALYSIS POINTEXISTING VEGETATED CONVEYANCEEAST ANALYSIS POINTSOUTH ANALYSIS POINTOFF-SITE DRAINAGE425426
4254234244274454454454434444444444
4
5
4
4
4
DATE ISSUEDSHEETJOB NUMBER520 SOUTH HARRINGTON STREET RALEIGH, NC 27601
919.828.2301 919.828.2303 (FAX) [e-mail]
These drawings are the property of HH Architecture, P.A. They may not be used for any purpose without written permission. Copyright 2016 by HH Architecture, P.A. All rights reserved.PROJECT STATUSNORTH CAROLINA AGRICULTURAL SCIENCES CENTER
NORTH CAROLINA DEPARTMENT OF AGRICULTURE AND CONSUMER SERVICES
4600 REEDY CREEK ROAD, RALEIGH NCNCDEQ STORMWATERSCO# 16-14380-02BNO.REVISIONDATEFIRM LICENSE #: C-1051www.stewartinc.comPROJECT #: 16123223 S. WEST ST, SUITE 1100RALEIGH, NC 27603T 919.380.87501COMMENTS11.07.18FOR REVIEW ONLYFF=267.18'SURVEY CONTROL POINTEXISTING IRON PIPEEXISTING CONCRETE MONUMENTSTORM DRAIN MANHOLESANITARY SEWER MANHOLEHYDRANTWATER VALVEWATER METERWATER MANHOLEGAS VALVEGAS METERTELEPHONE MANHOLETELEPHONE PEDESTALTV MANHOLETV PEDESTALELECTRIC MANHOLEELECTRIC BOXUTILITY POLEGUY WIRELIGHT POLETRAFFIC SIGNAL BOXBOLLARDSIGNFINISHED FLOOR ELEVATIONUNDERGROUND TELEPHONE LINEUNDERGROUND FIBER OPTIC LINEUNDERGROUND GAS LINEUNDERGROUND ELECTRIC LINEUNDERGROUND WATER LINESANITARY SEWER LINESTORM DRAIN LINEOVERHEAD WIRESUNIDENTIFIED LINEEIPECMDIPPVCHDPERCPCMPCBTFOGEWSSOHWUDUCTILE IRON PIPEPOLYVINYL CHLORIDE PIPEHIGH-DENSITY POLYETHYLENE PIPEREINFORCED CONCRETE PIPECORRUGATED METAL PIPECATCH BASINCATVTPEDGMWMTRAFFIC SIGNAL POSTGVELECTRIC METERUNKNOWN DESTINATIONFIBER OPTIC WITNESS POSTBORING LOCATIONSTORM DRAIN CURB INLETCOMPUTED POINTFIBER OPTIC BOXGUY POLEMANHOLEDECIDUOUS TREEEVERGREEN TREEBUSHWIRE FENCECHAIN LINK FENCECONCRETE SURFACEWVFOWPEMBORIOLIAMERICAN HOLLYCREPE MYRTLEPOPTQREASTERN SYCAMORELOBLOLLY PINERED OAKEXAMPLE: 10QR = 10" RED OAKMGSOUTHERN MAGNOLIAJVEASTERN RED CEDARSURVEY TREE LEGEND:SURVEY LEGEND:SW4.0PROPOSEDDRAINAGE AREAC1612311.07.2018030601201"= 60'SCALE:NORTHABBREVIATIONS:NORTH DRAINAGE AREA14.128 ACEAST DRAINAGE AREA1.664 ACSOUTH DRAINAGE AREA5.425 ACIMPERVIOUS AREA

Appendix 7

Seasonally High Water Table Report

Ecological Engineering, LLP Project No. 10502-197 Page 1 of 2
1151 SE Cary Parkway, Suite 101
Cary, North Carolina 27518
[phone]
www.ecologicaleng.com
July 4, 2017

Ms. Jennifer Wagner, PLA, ASLA, LEEP AP
Stewart, Inc.
421 Fayetteville Street, Suite 400
Raleigh, NC 27601

Re: Seasonal High Water Table (SHWT) Evaluation
NC Agricultural Center
Raleigh, Wake County, NC

Ms. Wagner:

Ecological Engineering, LLP (Ecological Engineering) appreciates the opportunity to provide this Seasonal
High Water Table (SHWT) evaluation with regard to the proposed BMPs at the abovementioned site.
The project site is situated near at the intersection of Edwards Mill Rd. and Reedy Creek Rd. in Raleigh
(Figure 1). Ecological Engineering utilized information provided by Stewart, to locate the soil borings for
the SHWT determination. Two areas were hand-augered to review and determine the SHWT.
Assessments were conducted by Heather Smith, LSS, on July 4, 2017. The following information
summarizes the results of our evaluation.

Existing Conditions and Area of Evaluation

The current landuse surrounding Hole # 1 is a maintained lawn with clover and fescue and Hole # 2 is an
active cattle pasture. The holes were dug within the footprints of the proposed BMPs (Figure 2).

According to the Soil Survey of Wake County, NC (Cawthorn, 1970) and current data on the USDA Web
Soil Survey, the underlying soil at Hole #1 is Appling sandy loam with 2 to 6 percent slopes and the soil at
Hole # 2 is Cecil gravelly sandy loam with 6 to 10 percent slopes. These soils are well drained with a
subsoil of clay with moderate permeability. Appling and Cecil soils have moderate to rapid runoff. These
soil series occur on ridges and side slopes in uplands within the Piedmont of North Carolina.

Results

The following information describes the soils encountered at the boring location. Our assessments
followed and were consistent with Rule 1942 (NCAC.2004) which states “a soil wetness condition shall
be determined by the indication of colors of chroma 2 or less (Munsell Color Charts) at > 2% of soil
volume or a soil wetness condition shall also be determined by periodic direct observation or indication
of saturated soils or a perched water table, or lateral water movement flowing into a bore hole
monitoring well, or open excavation above a less permeable horizon or horizon subdivision that may
occur without the presence of colors of chroma 2 or less”. Please be advised the auger method for visual
field assessment by soil color can be an inaccurate assessment of the actual SHWT. The percentage of
SHWT indicators is difficult to determine. The use of a pit provides a greater degree of accuracy.

0 1,000 2,000500
Feet
³2013 USGS Quadrangle Raleigh West
Figure 1Seasonal High Water Table DeterminationVicinty MapNC Agricultural CenterWake County, NCJuly 2017
Prepared By:Prepared For:
Project Location
0 300 600150
Feet
³
Legend
Proposed BMP
2013 NC Onemap Aerials
Figure 2Seasonal High Water Table DeterminationBoring LocationsNC Agricultural CenterWake County, NCJuly 2017
Prepared By:Prepared For:
Hole # 2
Hole # 1Edwards Mill Rd.Reed
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