SW4220502_BUA Allocations_20220514

Project
Snow Camp Solar, LLC
Alamance County, NC
Date: 2/9/2022
By: M. Carreon, PE
Checked: C. Baralus, PE
1. SSW-SWU-101 BUA Calculation Backup
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Total Property Area (ac)
76.87
ac
As -Built ALTA (3/3/2016)
Total Coastal Wetlands Area (ac)
0
ac
Surface Waters (ac)
0
ac
Total Project Area (ac)
25.33
ac
Fence line per As -Built ALTA (3/3/2016) CAD DWG
Basin Information
Drainage Area 1
Receiving Stream Name
Reedy Branch
Jordan Lake Watershed inside Cape Fear River Basin
Stream Class
WS-V; NSW
Stream Index Number
16-28-3
Total Drainage Area (sf)
1,103,375
On -site Drainage Area (sf)
1,103,375
Off -site Drainage Area (sf)
0
Proposed Impervious Area (sf)
48,783
1 1.12
Jac
% Impervious Area (total)
4.42%
1 24.21
1 oc (Grassed Areas)
Impervious Surface Area
(See BUA max.
below)
Drainage Area 1
On -site Buildings/Lots (sf)
0
On -site Streets (sf)
43,758
From DWG
On -site Parking (sf)
0
On -site Sidewalks (sf)
0
Other on -site (sf)
5,025
1596
Equipment Pads from DWG
3429
Foundation Posts (Piles); assume 4-inch diameter (Total
No. of Posts=2,360; of which 275 were installed with o 12"
dio. concrete sleeve; and 91 with o concrete spread footer.
See plans)
Future (sf)
0
Off -site (sf)
0
Existing BUA (sf)
0
Total (sf)
48,783
2. NOTES
a. Alamnance County is a Phase 2 Tipped County
b. Subject to MS4 requirements per 15A NCAC 02H.1016
c. BUA is 24% max.

Project: Snow Camp Solar, LLC
Alamance County, NC
Date: 2/9/2022
By: M. Carreon, PE
Checked: C. Baralus, PE
Cypress Creek Renewables
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. However, it does not meet the
Disconnection Length threshold (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 scourig
along the dripline (See As -Built Structural Plans, Sheet 5-301- Rack Section & Bay Plan Views).
Solar Panel Width (ft)
12.17
per As -Built ALTA (3/3/2016)
Row Spacing (ft)
8.83
per As -Built ALTA (3/3/2016)
Average Slope (%)
6.0%
per Preliminary Plat with Topo (4/28/2015)
< 8%
Yes
DL Ratio
72.6%
See plans for overall vegetated areas
>80%
No
Figure 1: Disconnection of flow path between solar panels when average slope is
less than 8%.
Solar Panel Width = X ft I Disconnection Length i X ft I Solar Panel Width = X ft
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 raw. 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.