SW6200303_2020-03-30 Boykin Stormwater Report_4/2/2020

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''� Ballentine
Associates, P.A.
Stormwater Management Report
For
Boykin PV1 Farm Solar Power Plant
Wade, Cumberland County, North Carolina
(PIN# 0479-45-2358; 0479-53-7215; 0479-28-8759)
Prepared by:
Ballentine Associates, P.A.
Consulting Engineers
221 Providence Road
Chapel Hill, NC 27514
[phone]
BA Project #: 114003.19
Issue Dates Description
30 Mar 20 To NCDEQ

Boykin PV 1 Farm Solar Power Plant Ballentine
30 Mar 20
Associates, P.A.
Existing Conditions Description:
The Boykin PV 1 Solar Power Plant is located off James Dail Road in Wade, Cumberland County, North
Carolina. The properties contain 350.83 acres of forest. The project site is approximately 158.1 acres.
The existing soils on site are: Candor sand, 1 to 8 percent slopes (CaB), Coxville loam (Co), Exum
loam, 0 to 2 percent slopes (ExA), Goldsboro loamy sand 0 to 2 percent slopes (GoA), Johnston loam
(JT), Lynchburg sandy loam, 0 to 2 percent slopes (Ly), Nahunta loam (Na), Norfolk loamy sand, 0 to 2
percent slopes (NoA), Norfolk loamy sand, 2 to 6 percent slopes (NoB), Pantego loam (Pg), Rains sandy
loam, 0 to 2 percent slopes (Ra). A majority of the site (40.2%) is in hydrologic soils group "A"; with
the remaining being hydrologic soil groups "C" (32.5 %), "C/D" (13.2 %), "A/D" (9.6 %), "B" (3.7%)
and `B/D" (0.8%). Almost the entire site drains west towards Bakers Swamp. There are multiple
wetlands throughout the property. Wetlands are located mostly on south and west portion of the site.
FIRM Panel 3720046800J indicates the project limits do not lie within a special flood hazard area. The
surface water classification for the site is C. The site is located in the Cape Fear River basin. Project site
Latitude and Longitude is 35.1108440°and-78.7512888°.
Description of Proposed Proiect and Stormwater Design:
The proposed solar farm consists of tracker solar panels, dual inverter/transformer areas and a chain link
fence along the perimeter of the array. The project will also include temporary laydown and parking
areas, and a two permanent driveway aprons along Poverty Flats Road and James Dial Road. The
installation of the solar panels themselves will not generally create significant land disturbance. The
panels will be mounted to racks, which are supported by a series of posts. The posts will be driven
directly into the existing ground without excavation or land disturbance and the existing ground cover
will be allowed to remain to the extent possible. Overall, approximately 158.1 acres of land will be
disturbed by construction; this is our entire project limits. The project areas true disturbance is caused by
the installation of the proposed sediment basins, the proposed diversion ditches, rubber tire vehicles
accessing the site to distribute and install above grade material and several small trenches (2' wide, 36"
deep) for wiring the array. The rack posts are mechanically driven directly into the ground. The
temporary sediment basins will be installed at the bottom of the sites major drainage areas and will treat
the majority of the disturbed area. The remainder of the disturbed area will be protected by silt fence
with silt fence outlets. No change in drainage patterns (site drainage remains as sheet flow) or additional
ponding of water will occur as a result of this project. At the completion of construction, the entire site
will be seeded to create a good stand of grass.
Stormwater sheet flows off the panels and infiltrates into the ground beneath the panels, as described in
Chapter E-6 of NCDEQ's Stormwater Design Manual, and therefore does not contribute to the post
development impervious cover on the site. The proposed gravel drive, inverter pads, and rack posts will
contribute a total of 148,607 s.f. of impervious surface. An Impervious allowance of 195,735 s.f. has
been added incase additional impervious is needed as construction of the site progresses. As shown in
the Boykin PV 1 — Impervious Percentage Calculations included in Appendix B, the post development
impervious cover is 5.0% of the total project area. Therefore, this project is considered Low Density and
does not alter the pre -development stormwater runoff characteristics of the site.

Boykin PV 1 Farm Solar Power Plant
30 Mar 20
List of Appendices:
Appendix A - Maps
o DA 1 Proposed Site Area Map
o Soils Maps
■ Hardbound Soils Map
■ NRCS — Soil Survey Map
■ NRCS — Soil Survey Map — Hydrologic Soil Group
o USGS Topo Map
o FIRM Panel 3720046800J
o Aerial Photo
• Appendix B — Stormwater Design Calculations
o Boykin PV 1 — Impervious Percentage Calculation
Ballentine
Associates, P.A.

Boykin PV 1 Farm Solar Power Plant
30 Mar 20
Appendix A - Maps
o DA 1 Proposed Site Area Map
o Soils Maps
■ Hardbound Soils Map
■ NRCS — Soil Survey Map
■ NRCS — Soil Survey Map — Hydrologic Soil Group
o USGS Topo Map
o FIRM Panel 3720046800J
o Aerial Photo
Ballentine
Associates, P.A.

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DRAWING LEGEND
LIMITS OF DISTURBANCE/
PROJECT SITE
SITE IMPERVIOUS
TOTAL DISTURBED AREA= 158.1 AC
TOTAL AREA TO BE CLEARED & GRUBBED= 157.39 AC
SITE AREA:
TOTAL SITE AREA= 158.1 AC
PROPOSED SITE IMPERVIOUS= 3.41 AC
PROPOSED SITE IMP. ALLOWANCE = 4.49
TOTAL SITE IMPERVIOUS = 7.90
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ASSOCIATES, PA
221 PROVIDENCE ROAD,
(919) 929 - 0481
CHAPEL HILL. N.C. 27514
(919) 40 - 470
SCALE:
AS NOTED
DATE:
10 FEB 20
JOB NUMBER:
114003.19
DRAWN BY:
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3 Soil Map —Cumberland County, North Carolina
N
M
V
7044W 7046M 7048M 705000 7052W
35° 710" N
35° 67 N
704400 704600 704800 705000 705200
3
lV
v Map Scale: 1:9,220 if printed on A portrait (8.5" x 11") sheet
Meters
N 0 100 200 400 600
Feet
0 400 800 1600 2400
Map projection: Web Mercator Comer coordinates: WGS84 Edge tics: UTM Zone 17N WGS84
U}DA Natural Resources Web Soil Survey
Conservation Service National Cooperative Soil Survey
3
M
7056M
35° 7' 10" N
705600
3
12/12/2018
Page 1 of 3

MAP LEGEND
Area of Interest (AOI)
Area of Interest (AOI)
Soils
Soil Map Unit Polygons
rwr
Soil Map Unit Lines
0
Soil Map Unit Points
Special
Point Features
Vo
Blowout
Borrow Pit
Clay Spot
Closed Depression
Gravel Pit
.14
Gravelly Spot
0
Landfill
Lava Flow
Marsh or swamp
+
Mine or Quarry
Miscellaneous Water
Perennial Water
Rock Outcrop
Saline Spot
4
Sandy Spot
Severely Eroded Spot
Sinkhole
Slide or Slip
Sodic Spot
Soil Map —Cumberland County, North Carolina
MAP INFORMATION
Spoil Area
The soil surveys that comprise your AOI were mapped at
1:24,000.
Stony Spot
Very Stony Spot
Warning: Soil Map may not be valid at this scale.
Wet Spot
Enlargement of maps beyond the scale of mapping can cause
misunderstanding of the detail of mapping and accuracy of soil
Other
line placement. The maps do not show the small areas of
.-
Special Line Features
contrasting soils that could have been shown at a more detailed
scale.
Water Features
Streams and Canals
Please rely on the bar scale on each map sheet for map
measurements.
Transportation
Rails
Source of Map: Natural Resources Conservation Service
Web Soil Survey URL:
rwr
Interstate Highways
Coordinate System: Web Mercator (EPSG:3857)
US Routes
Maps from the Web Soil Survey are based on the Web Mercator
L
Major Roads
projection, which preserves direction and shape but distorts
distance and area. A projection that preserves area, such as the
Local Roads
Albers equal-area conic projection, should be used if more
accurate calculations of distance or area are required.
Background
.
Aerial Photography
This product is generated from the USDA-NRCS certified data as
of the version date(s) listed below.
Soil Survey Area: Cumberland County, North Carolina
Survey Area Data: Version 19, Sep 10, 2018
Soil map units are labeled (as space allows) for map scales
1:50,000 or larger.
Date(s) aerial images were photographed: Oct 29, 2014—Dec 4,
2017
The orthophoto or other base map on which the soil lines were
compiled and digitized probably differs from the background
imagery displayed on these maps. As a result, some minor
shifting of map unit boundaries may be evident.
USDA Natural Resources Web Soil Survey 12/12/2018
Conservation Service National Cooperative Soil Survey Page 2 of 3

Soil Map —Cumberland County, North Carolina
Map Unit Legend
Map Unit Symbol
Map Unit Name
Acres in AOI
Percent of AOI
CaB
Co
Candor sand, 1 to 8 percent
slopes
8.9
2.8
3.9%
1.2%
Coxville loam
ExA
Exum loam, 0 to 2 percent
slopes
73.9
32.5%
GoA
Goldsboro loamy sand, 0 to 2
percent slopes, Southern
Coastal Plain
8.5
3.7%
JT
Johnston loam
5.1
2.2%
Ly
Lynchburg sandy loam, 0 to 2
percent slopes
0.1
0.0%
Na
Nahunta loam
27.3
12.0%
NoA
Norfolk loamy sand, 0 to 2
percent slopes
57.1
25.1 %
NoB
Norfolk loamy sand, 2 to 6
percent slopes
25.4
11.2%
Pg
Pantego loam
1.8
0.8%
Ra
Rains sandy loam, 0 to 2
percent slopes
16.8
7.4%
Totals for Area of Interest
227.6
100.0%
USDA Natural Resources Web Soil Survey 12/12/2018
Conservation Service National Cooperative Soil Survey Page 3 of 3

35° 67 N
Hydrologic Soil Group —Cumberland County, North Carolina
7044W 7046M 70M 705000 7052W
704400 704600 704800 705000 70520C
3
lV
v Map Scale: 1:9,220 if printed on A portrait (8.5" x 11") sheet
Meters
N 0 100 200 400 600
Feet
0 400 800 1600 2400
Map projection: Web Mercator Comer coordinates: WGS84 Edge tics: UTM Zone 17N WGS84
U}DA Natural Resources Web Soil Survey
Conservation Service National Cooperative Soil Survey
3
M
7056M
35° 7' 10" N
705600
3
12/12/2018
Page 1 of 4

Hydrologic Soil Group —Cumberland County, North Carolina
MAP LEGEND
Area of Interest (AOI)
Area of Interest (AOI)
Soils
Soil Rating Polygons
0 A
0 A/D
0 B
0 B/D
C
0 C/D
0 D
Not rated or not available
Soil Rating Lines
r r A
r r A/D
r B
B/D
r r C
0 C/D
r r D
r r Not rated or not available
Soil Rating Points
0 A
0 A/D
■ B
■ B/D
MAP INFORMATION
p C
The soil surveys that comprise your AOI were mapped at
1:24,000.
0 C/D
0 D
Warning: Soil Map may not be valid at this scale.
p Not rated or not available
Enlargement of maps beyond the scale of mapping can cause
misunderstanding of the detail of mapping and accuracy of soil
Water Features
line placement. The maps do not show the small areas of
Streams and Canals
contrasting soils that could have been shown at a more detailed
scale.
Transportation
§_§_+ Rails
Please rely on the bar scale on each map sheet for map
#%-0 Interstate Highways
measurements.
US Routes
Source of Map: Natural Resources Conservation Service
Web Soil Survey URL:
Major Roads
Coordinate System: Web Mercator (EPSG:3857)
Local Roads
Maps from the Web Soil Survey are based on the Web Mercator
Background
projection, which preserves direction and shape but distorts
distance and area. A projection that preserves area, such as the
® Aerial Photography
Albers equal-area conic projection, should be used if more
accurate calculations of distance or area are required.
This product is generated from the USDA-NRCS certified data as
of the version date(s) listed below.
Soil Survey Area: Cumberland County, North Carolina
Survey Area Data: Version 19, Sep 10, 2018
Soil map units are labeled (as space allows) for map scales
1:50,000 or larger.
Date(s) aerial images were photographed: Oct 29, 2014—Dec 4,
2017
The orthophoto or other base map on which the soil lines were
compiled and digitized probably differs from the background
imagery displayed on these maps. As a result, some minor
shifting of map unit boundaries may be evident.
UU� Natural Resources Web Soil Survey 12/12/2018
� Conservation Service National Cooperative Soil Survey Page 2 of 4

Hydrologic Soil Group —Cumberland County, North Carolina
Hydrologic Soil Group
Map unit symbol
Map unit name
Rating
Acres in AOI
Percent of AOI
CaB
Candor sand, 1 to 8
percent slopes
A
8.9
2.8
3.9%
Co
Coxville loam
C/D
1.2%
ExA
Exum loam, 0 to 2
percent slopes
C
73.9
32.5%
GoA
Goldsboro loamy sand,
0 to 2 percent slopes,
Southern Coastal
Plain
B
8.5
3.7%
JT
Johnston loam
A/D
5.1
2.2%
Ly
Lynchburg sandy loam,
0 to 2 percent slopes
B/D
0.1
0.0%
Na
Nahunta loam
C/D
27.3
12.0%
NoA
Norfolk loamy sand, 0 to
2 percent slopes
A
57.1
25.1 %
NoB
Norfolk loamy sand, 2 to
6 percent slopes
A
25.4
11.2%
Pg
Pantego loam
B/D
1.8
0.8%
Ra
Rains sandy loam, 0 to
2 percent slopes
A/D
16.8
7.4%
Totals for Area of Interest
227.6
100.0%
USDA Natural Resources Web Soil Survey 12/12/2018
Conservation Service National Cooperative Soil Survey Page 3 of 4

Hydrologic Soil Group —Cumberland County, North Carolina
Description
Hydrologic soil groups are based on estimates of runoff potential. Soils are
assigned to one of four groups according to the rate of water infiltration when the
soils are not protected by vegetation, are thoroughly wet, and receive
precipitation from long -duration storms.
The soils in the United States are assigned to four groups (A, B, C, and D) and
three dual classes (A/D, B/D, and C/D). The groups are defined as follows:
Group A. Soils having a high infiltration rate (low runoff potential) when
thoroughly wet. These consist mainly of deep, well drained to excessively
drained sands or gravelly sands. These soils have a high rate of water
transmission.
Group B. Soils having a moderate infiltration rate when thoroughly wet. These
consist chiefly of moderately deep or deep, moderately well drained or well
drained soils that have moderately fine texture to moderately coarse texture.
These soils have a moderate rate of water transmission.
Group C. Soils having a slow infiltration rate when thoroughly wet. These consist
chiefly of soils having a layer that impedes the downward movement of water or
soils of moderately fine texture or fine texture. These soils have a slow rate of
water transmission.
Group D. Soils having a very slow infiltration rate (high runoff potential) when
thoroughly wet. These consist chiefly of clays that have a high shrink -swell
potential, soils that have a high water table, soils that have a claypan or clay
layer at or near the surface, and soils that are shallow over nearly impervious
material. These soils have a very slow rate of water transmission.
If a soil is assigned to a dual hydrologic group (A/D, B/D, or C/D), the first letter is
for drained areas and the second is for undrained areas. Only the soils that in
their natural condition are in group D are assigned to dual classes.
Rating Options
Aggregation Method: Dominant Condition
Component Percent Cutoff. None Specified
Tie -break Rule: Higher
uSDA Natural Resources Web Soil Survey 12/12/2018
Conservation Service National Cooperative Soil Survey Page 4 of 4

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This digital Flood Insurance Rale Map IF.RM) was produced through a unique
.operative Ped-dehip between the State of Nodh Carding antl the Federal
Emergency Management Agency (FEMA). The State of No Carolina he
s
implemented a long tens approach to floodplain management W decrease the
costs associated with flooding. Thls Is dann"dareted by the State's .mmland-
to reap flood hazard areas at he local level. As a part of this eRort, the State of
North Carolina M1as joined in a C.pemtirg Tadh,idal State agreement with
FEMAto produce and maintain this digital FIRM.
FLOOD HAZARD INFORMATION NOTES TO USERS SCALE
SEE FIS REPORT
FOR ZONE DESCRIPTIONS AND INDEX MAP
THE INFORMATION
DEPICTED ON THIS MAP AND SUPPORTING
DOCUMENTATION
ARE ALSO AVAILABLE IN DIGITAL FORMAT AT
HTTP://FR IS. NC.GOV/FRIS
Base Flood Elevation (BFE)
-Without
Zone A,V, A99
With BFE or Depth Zone AE, AD, AH, VE, AR
SPECIAL FLOOD
Regulatory Floodway
HAZARD AREAS
— 0.2%Annual Chance Flood Hazard, Areas
of 1%Annual Chance Flood with Average
Depth Less Than One Foot or With Drainage
Areas of Less Than One Square Mile zone x
— Future conditions )%Annual
Chance Flood Hazard Zone X
OTHER AREAS OF
— Area with Reduced Flood Risk due to Levee
FLOOD HAZARD
See Notes Zonex
OTHER
— Areas Determined to be Outside the
AREAS
0.2%Annual Chance Floodplain zi,­ x
Channel, Culvert, or Storm Sewer
Accredited or Provisionally Accredited
GENERAL
Levee, Dike, orFloodwall
STRUCTURES
r r l r l r l r l l r r Non -accredited Levee, Dike, or Floodwall
3M551O. North Carolina Geodetic Survey bench mark
BM5510,D National Geodetic Survey bench mark
BM5510® Contractor Est. NCFMP Survey bench mark
012 a�Cross Sections with 1%Annual Chance
Water Surface Elevation (BFE)
0 - - - - - Coastal Transect
------- Coastal Transect Baseline
— - Profile Baseline
Hydrographic Feature
OTHER
Limit of Study
FEATURES
Jurisdiction Boundary
For 'afamatior-d ues8onsaboutthisma available roaudle ass.iated with this FIRM ind.din
historic vereions of this FIRM, how to order products orthe National Flood Insurance Program in general,
pkase call the FEMA Map Information ,Xc ,nge at 1-877-FEMA-MAP (1-877-3W-2627) or visit the FEMA Map
Service Center —he at Marl/mscfdrin v. An accompanying Flood Insurznce Study re port, Letterof Map
Revision LOMR or Letter of Ma Amentlmenb LOMA rev aafthe anal antl di ital veraians of this
( ) P ( ) iain9 ping P P g
FIRMmaybe available. Sitthe NortM1 Carding Flootlplain Mapping Program weteite a[M1dp:llwww.ncllootlmaps.con
or.nfad the FEMA Map Service Center
Communities annexing land on adjacent FIRM panels must obtain a current.py of the adjacent panel as vrell as
the current FIRM Index. These may be orderetl diready from the Map Service Center at the number hated above.
Far.mmuniry and .unrywide map dates refer to the Flood Ireumnce Study report f. this Iunsdiddi n.
To determine if flood Insurance is available in dre community, contact your Insura—agent or call the Natimal
Flail Inure Program at 1-800-638-6620.
Base map information.h.. Mis FIRM was provided in digital format by the North Carolina Flootlplain
Mapping Progmm (NCFMP). The source of this'roformetion can be, tletermined from the metatlata available in the
digital FLOOD database and in fM1e Technical Support Data Notebook (TSON).
ACCREDITED LEVEE NOTES TO USERS: If an accredited levee note appears on this panel check with your local
unity to obtain more information,...has the estimatetl level of proton. provid8d (whi.h may ex.etl the
1-percenten... lchance 1e 1) and Emergency Action Plan, on the levee system(sl shown as providing protection.
To mitigate flood risk in resitlual risk areas, property owrere and residents are enc.regetl h oonsiderflood
Insuande and floodprooflng or other proteMlve measures. For more Infortnatlon on flootl Insurance. InNirea ed
Parties should visit In. FEMA Webaita at M1t¢://www.f8 .RdddbasinBaNngpflndexaMm.
PROVISIONALLY ACCREDITED LEVEE NOTES TO USERS: If a Provisionally Accredited Levce (PAL) .te
apraars on this panel, checkwith your local.mmunity to obtain more information, suchastheastidn" levelof
protection provided (which may exceed the 1-percentannualohance level) and Emergency Action Plan, on the
levee syabem(s)aM1own as provitling prdedion. To maintain a.retlfletion, the levee owner or community is
required to a,bmitthe data and documentation necessary to comply With Section 65.10 of the IN RIP ro,idatis.
If the Bonn i o er does not homde the necessa data and docuan.ra on or d the data and dowmentation ry then p ry
h,odaetl d ,i,ktes the levee system tlaes nM.mply with Sedien 65.10 requirements, FEMAwill revise the flood
haze.. and risk Infopn . for n. area to reflect de-a.redflation of the levee system. To mitigate flootl risk fl
resitlual risk areas, property owners antl esitlents are a flood
in tl bod, in—r flootl insurance antl flathe FIRMA
IR A
or other protective measures. For more information on flood Insumnce, interested parries should visit the FEMA
WabsRe at M1bg://caeca.fema.govlbusinessln0pintlex.sM1bm.
UMITOFMODERATEWAVEACTION NOTES TO USERS: Forlorn coasfalraddin9 0 z ,the AEZone category has boon divitletl n I a Limit of Moderate Wave Actl. , had,I ). The o,n th re E Z rd the approximate
landward limit of the 1.5-foot breaking wave. The eRec5 of wave hazards between the VE Zone and the LIMWA
(orbetween the in the antlLiMWAfar areas wM1ereVE Zones are not itlen00etl)will be similarbar tub leas
those in
severe than ththe VE zone.
.
Limit of Moderate Wave Action (LiMWA)
COASTAL BARRIER RESOURCES SYSTEM (CBRS) NOTE
This map may md,deapproplmateboundaries ofthe CBRS for informational purposes only. Flood insurance is not
vailable wiMln CBRS areas f.s[mcmres iM1at are newly built or sutabantially impro d.—afterdaidate(s)
iMlcatedonth—ir. For more iMermetion see help://www.fws.govlhabifatconservetl./coastal b,dd,,Nml,ihe
PIS Report, or call the U.S. Fiah and Wildlife Service Customer Service Canter at 1-800-344-WILD.
® CBRSArea 0 Otherwise Protected Area
eM."PmleCuon:
North Carolina State Plane Projection Feet (Zone 3200)
Datum: NAD 1983 (Hor¢ontal), NAVD 1988 (Vertical)
1 inch = 1,000 feet 1:12,000
0 500 1,000 2,000
Feet
Meters
0 150 300 600
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CUMBERLAND COUNTY 370076 0468 d
EASTOVER, TOWN OF 370425 0468 d
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3720046800J
MAP REVISED
01/05/07

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Boykin PVl Farm Solar Power Plant
30 Mar 20
Appendix B — Stormwater Design Calculations
o Boykin PVI — Impervious Percentage Calculation
Ballentine
Associates, P.A.

Boykin PV 1 Solar Power Plant - Impervious Calculation
Existing Conditions Area (sf) Area (ac) % of Total
Pervious
Wooded Areas
6,886,836
158.100
100.00%
Agricultural Fields/Lawns
0
0.000
0.00%
Impervious
Drives (Gravel/Conc./Asphalt)
0
0.000
0.00%
Structures
0
0.000
0.00%
Existing Impervious=
0
0.000
0.00%
100.00%
Total Site Area =
6,886,836
158.100
Proposed Conditions
Area (sf)
Area (ac)
% of Total
Pervious
Wooded Areas
0
0.000
0.00%
Agricultural Fields/Lawns
6,542,494
150.195
95.00%
Impervious
Existing Drives to Remain
0
0.000
0.00%
Existing Structures to Remain
0
0.000
0.00%
Proposed Drives (Gravel/Conc./Asphalt)
143,649
3.298
2.09%
Switchgear Pads
# of Pads
Area/Pad (sf)
Inverter Total
6
400
2,400
0.055
0.035%
Inverter Areas
(Assumes entire graded area)
# of Inverters
Area/Inverter
Inverter Total
6
400
2,400
0.055
0.03%
Rack Posts
Posts/Rack
# of Racks
Area/Post (in z)
Rack Posts Total
13
761
2.3
158
0.004
0.00%
Impervious Allowance
195,735
4.493
2.84%
Proposed Impervious=
344,342
7.905
5.00%
Total Site Area =
6,886,836
158.100
100.00%
Boykin Farm Site Impervious Calcs
Impervious Calcs 3/30/2020