SW3240305_Supplement-EZ Form_20240604

SUPPLEMENT-EZ COVER PAGE
I OR V S LOAM()
PROJECT INFORMATION
1 Project Name Blackwelder Retail 100kV Substation Protect
2 Project Area(ac) 9 64
3 Coastal Wetland Area(ac) o•
4 Surface Water Area(ac) - _ - - -- - 0
5 _Is this Project High or Low Density? - Low
6 Does this project use an off-site SCM? No
COMPLIANCE WITH 02H.1003(4)
7 LW idth of vegetated setbacks provided(feet) n!a
8 WiII the vegetated setback remain vegetated? Yes
9_ If BUA is proposed in the setback,does it meet NCAC 02H 1003(4Xc-d)? n!a
10 Is streambank stab.lization proposed on this project? No
NUMBER AND TYPE OF SCMs:
11 Infiltration System 0
12 Bioretention CO 0
13 Wet Pond 0
14_~Stormwater Wetland 0
15 Permeable Pavement 0
18 Sand Filter 0
17 Rainwater Harvestin0_(RWH) 0
18 'Green Roof 0 _---
19 Level Spreader-Filter Strip(LS-FS) 0
20 Disconnected Impervious Surface(DlS) 0
21 Treatment Swale 0
22 ,I 1 Pond _- 0
23 StormFilter 0
24 „Silva Cell 0
25 Bayfdter _ �._.-....---- 0
r26 Filterra —._._ 0
FORMS LOADED
DESIGNER CERTIFICATION _ __I
27 IName and Title: Jamie Gollings
28 'Organization: _ Jacobs
29 Street address:__ 111 Coming Rd STE 200
30 Cily,State,Bp: Cary,NC 27518
31 Phone numbers): 919-600-1163
32 Email: jamie.gollings®gmail.com
Certification Statement:
I certify,under penalty of law that this Supplement-EZ form and all supporting information were prepared under my d rection 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
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DRAINAGE AREAS
1 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) 419966 247197 142,631 30,138
6 Onsite drainage area(sq ft) 419966 247197 142,631 30138
7 Offsite drainage area(sq ft) 0 0 0 0
8 Total BUA in project(sq ft) 75529 sf 75529 sf 0 0
New BUA on subdivided lots(subject to permitting)
9 (sq ft) 75529 sf 75529 sf 0 0
New BUA not on subdivided lots(subject to
10 permitting)(sf) 0 0 0 0
11 Offsite BUA(sq ft) 0 0 0 0
12 Breakdown of new BUA not on subdivided lots:
-Parking(sq ft) 0 0 0 0
-Sidewalk(sq ft) 0 0 0 0
-Roof(sq ft) 0 0 0 0
-Roadway(sq ft) 28629 sf 28629 sf 0 0
-Future(sq ft) 0 0 0 0
-Other,please specify in the comment box
below(sq ft) 46900 sf 46900 sf 0 0
New infiltrating permeable pavement on
13 subdivided lots(sq ft) N/A N/A N/A N/A
New infiltrating permeable pavement not on
14 subdivided lots(sq ft) N/A N/A N/A N/A
Existing BUA that will remain(not subject to
15 permitting)(sq ft) 0 0 0 0
16 Existing BUA that is already permitted(sq ft) 0 0 0 0
17 Existing BUA that will be removed(sq ft) 0 0 0 0
18 Percent BUA 18% 31% 0% 0%
19 Design storm(inches) 1.0 in 1.0 in 1.0 in 1.0 in
20 Design volume of SCM(cu ft) N/A N/A N/A N/A
21 Calculation method for design volume N/A N/A N/A N/A
ADDITIONALD FORMATION
Please use this space to provide any additional information about the
22 drainage area(s):
Other-gravel pad

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) 3:1
5 Maximum velocity in the vegetated conveyances during the 10-year storm? 2
6 Are curb outlet swales proposed? No
7 Maximum longitudinal slope of curb outlet swale(s)(%) n/a
8 Bottom width of curb outlet swale(s)(feet) n/a
9 Maximum side slope of curb outlet swale(s)(H:V) n/a
10 Minimum length of curb outlet swale(s)(feet) n/a
11 Are treatment swales used instead of curb outlet swales? No
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:
Flow on site handled by dispersed flow.
Drainage Pervious
Swale Area BUA area C Q Slope V,iiow V., Flow depth
# (ac) (ac) (acl (cfs) (%) (fps) (fps) (ft)
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