SW3211202_BUA Allocations_20220223

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Project: Old Pageland Monroe [load Solar Farm, LLC
Union County, NC
Date: 12/12/2021
By: J. Graham, PE
Checked: M. Carreon PE
1. SSW-SWU-101 BUA Calculations Backup
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Total Property Area (ac)
35.74
ac
Civil Plans (sheet C1, 4/10/2015)
Total Coastal Wetlands Area (ac)
0.0
ac
Surface Waters (ac)
0.0
ac
Total Project Area (ac)
31.2
ac
LOD per Civil Plans (sheet C1, 4/10/2015)
Basin Information
Drainage Area 1
Receiving Stream Name
Flag Branch
Yadkin Pee -Dee River Basin
Stream Class
C
Stream Index Number
13-17-36-8-2
Total Drainage Area (sf)
1,359,072
On -site Drainage Area (sf)
1,359,072
Off -site Drainage Area (sf)
0
Proposed Impervious Area Of)
5439
0.12
ac
% Impervious Area (total)
0.40%
31.08
lac (Grassed .areas)
Impervious Surface Area
(See BUA max.
below)
Drainage Area 1
On -site Buildings/Lots (sf)
0
On -site Streets (sf)
4126
DWG
On -site Parking (sf)
0
On -site Sidewalks (sf)
0
Other on -site (sf)
1313
1104
Equipment Pads (DWG)
209
Foundation Posts (Piles); assume 4-inch
diameter (Total No. of Posts =2,396 )
Future (sf)
0
Off -site (sf)
0
Existing BUA (sf)
0
Total on
5439
2. NOTES
a. Union County is a Phase 2 Tipped County
b. Subject to MS4 requirements per iSA NCAC 02H.1016
c. BUA is 24% max.

Project: Old Pageland Monroe Road Solar Farm, LLC
Union County, NC
Date: 12/12/2021
By: 1. Graham, PE
Checked: M. Carreon, PE
3. NCDEQ Stormwater Design Manual (Rev. 12-13-2018) E-6 Solar Farms
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Regulatory Requirements:
DEMLR allows solar panels associated with ground -mounted solar farms to considered pervious
Other structures associated with the solar farm - buildings, entrance roads, transformers (concrete pads)
and footings are still considered impervious.
Recommendation 2: Disconnect runoff from solar panel arrays
The project has been installed to allow for vegetation under and in between the solar arrays; and the
terrain slopes are less than 8% along the disconnection flow path (see dimensions below).
Recommendation 6: Limit vertical clearance to less than or equal to 10 feet
The project solar panel maximum heights are less than 10 feet, which helps prevent erosion and scoung
along the dripline (see Solar Panel and Racking System Details provided).
Solar Panel Width (ft)
12.33
per As -Built ALTA (11/2/2015); approx. average across site
Row Spacing (ft)
10.92
per As -Built ALTA (11/2/2015); approx. average across site
Average Slope (%)
6.5%
per Civil Plans (sheet C4, 4/10/2015)
< 8%
DL Ratio
88.6%
>80%
Yes
Figure 1: Disconnection of flow path between solar panels when average slope is
less than 8%.
Solar Panel Width n X R Disconnection Length 2 X ft Solar Panel Width . X ft
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Avg Siope 5 8%
In general, the minimum disconnection length between two rows of solar panels is equal to the
width of each row, as shown in Figure 1. However, some panel layouts include horizontal gaps
between individual modules that allow stormwater to drip off the panels at intervals much
smaller than the width of each row. In these instances, the solar farm can be designed with a
smaller disconnection length, provided that they will not cause concentration of stormwater
runoff. The disconnection length should not be less than 80% of the total solar panel width.