SW6240107_Supplement-EZ Form_20240529

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FORMS LOADED
tOJECT INFORMATION
1 Project Name Raeford South 115kV Substation Rebuild
2 Project Area(ac) 4.16 _
3 Coastal Wetland Area(ac) 0
4 Surface Water Area(ac) 0 —
5 Is this project High or Low Density? Low
6 Does this project use an off-site SCM? f No
)MPLIANCE WITH 02H.1003(4)
7 Width of vegetated setbacks provided(feet) 10 _
8 Will the vegetated setback remain vegetated? Yes
9 If BUA is proposed in the setback,does it meet NCAC 02H.1003(4)(c-d)? N/A
0 Is streambank stabilization proposed on this project? No
AMBER AND TYPE OF SCMs:
1 Infiltration System _ I 0
2 Bioretention Cell _ 0
3 Wet Pond 0
4 Stormwater Wetland _ 0
5 Permeable Pavement _ 0
6 Sand Filter i 0
7 Rainwater Harvesting(RWH) 0
8 Green Roof 0
9 Level Spreader-Filter Strip(LS-FS) 0
:0 Disconnected Impervious Surface(DIS) 0
:1 Treatment Swale 0
2 Dry Pond 0
:3 StormFilter 0
:4 Silva Cell 0
:5 Bayfllter 0
:6 Filterra 0
FORMS LOADED
:SIGNER CERTIFICATION
7 Name and Title: Patrick Covil,Senior Project Manag_er
:8 Organization: _ McAdams
:9 Street address: 621 Hillsborough St.Suite 500
;0 City,State,Zip: I - RaleigLNC 27603
.1 Phone number(s): 1— _ 919-6333806_.
;2 Email: [e-mail]
Certimation Statement
I certify,under penalty of law that this Supplement-EZ form and all supporting information were prepared under my direction or supervision;that the
information provided in the form is,to the best of my knowledge and belief,true,accurate,and complete;and that the engineering plans,
specifications,operation and maintenance agreements and other supporting information are consistent with the information provided here.
Designer
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DRAINAGE AREAS
Is this a high density project? No
2 If so,number of drainage areas/SCMs _ 0
3 Does this project have low density areas? _ Yes
4 If so,number of low density drainage areas _ 3
Is all/part of this project subject to previous rule
5 versions? No
FORMS LOADED
DRAINAGE AREA INFORMATION Entire Site LD 1 LD 2 LD 3
4 Type of SCM N/A N/A N/A N/A
5 Total drainage area(sq ft) 181275 75799 43598 61878
6 Onsite drainage area(sq ft) 181275 75799 43598 61878
7 Offsite drainage area(sq ft) 0 0 0 0
8 Total BUA in project(sq ft) 40518 sf 13000 sf 8440 sf 19078 sf
New BUA on subdivided lots(subject to
9 permitting)(sq ft)
New BUA not on subdivided lots(subject to
10 permitting)(sf) 40518 sf 13000 sf 8440 sf 19078 sf
11 Offsite BUA(sq ft)
12 Breakdown of new BUA not on subdivided lots:
-Parking(sq ft) 18868 sf 10050 sf 5290 sf 3528 sf
-Sidewalk(sq ft)
-Roof(sq ft)
-Roadway(sq ft)
-Future(sq ft)
-Other,please specify in the comment box
below(sq ft) 21650 sf 2950 sf 3150 sf 15550 sf
New infiltrating permeable pavement on
13 subdivided lots(sq ft)
New infiltrating permeable pavement not on
14 subdivided lots(sq ft)
Existing BUA that will remain(not subject to
15 permitting)(sq ft)
16 Existing BUA that is already permitted(sq ft)
17 Existing BUA that will be removed(sq ft)
18 Percent BUA 22% 13% 19% 31%
19 Design storm(inches)
20 Design volume of SCM(cu ft)
21 Calculation method for design volume
ADDITIONAL INFORMATION
Please use this space to provide any additional information about the
22 drainage area(s):
"Other"BUA breakdown indicates substation shoulder and gravel
access/apron.

LOW DENSITY
DESIGN REQUIREMENTS FOR LOW DENSITY PROJECTS FROM 02H.1003 1 Is project below density thresholds set forth in the applicable stormwater rule? Yes
2 Does project maximize dispersed flow and minimize channelization of flow? Yes
3 Has the use of piping been minimized per.1003(2)(c)? Yes
4 Side slopes of the vegetated conveyances(H:V) 4:1
5 Maximum velocity in the vegetated conveyances during the 10-year storm?
6 Are curb outlet swales proposed? No
7 Maximum longitudinal slope of curb outlet swale(s)(%)
8 Bottom width of curb outlet swale(s)(feet)
9 Maximum side slope of curb outlet swale(s)(H:V)
10 Minimum length of curb outlet swale(s)(feet)
11 Are treatment swales used instead of curb outlet swales?
12 Is stormwater released at the edge of the setback as dispersed flow? Yes
13 Have stormwater outlets been designed to prevent downslope erosion? Yes
14 Are variations to rule.1003 proposed? No
ADDITIONAL INFORMATION
15 Please use this space to provide any additional information about this low density project:
Dispersed flow was used across the entire project.No channelized flow was created.
Drainage Pervious
Swale Area BUA area C Q Slope V,Oow V,no,i Flow depth
# ac (ac) (ac) (cfs) (%) (fps) (fps) (ft)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30