SW5240801_Supplement-EZ Form_20241104

SUPPLEMENT-EZ COVER PAGE
FORMS LOADED
PROJECT INFORMATION
1 Project Name Spring Hope 115kY Substation Rebuild
2 Project Area ac 6-54
3 Coastal Wetland Area ac 0
4 Surface Water Area ac 0
5 is this project Hi h or Low Density? Low
6 Does this project use an off-site SCM? No
COMPLIANCE WITH 02H A003{4)
7 Width of vegetated setbacks provided feet 8 min.
8 Will the vegetated setback remain vegetated? Yes
9 If BUA is pro posed in the setback,does it meet NCAC 02H.1003 4 c-d? NIA
10 Is streambank stabilization proposed on this project? No
NUMBER AND TYPE OF SCMS:
11 JJnfiltration System Q
12 Bioretention Cell 0
13 JWet Pond 0
14 1Stormwater Wetland 0
15 Permeable Pavement 0
16 ISand Filter 0
17 Rainwater Harvesting RWHI 0
18 Green Roof 0
19 Level Spreader-Filter Strip LS-FS 0
20 Disconnected Impervious Surface(DIS) 0
21 Treatment Swale 0
22 Dy Pond 0
23 StormFilter 0
24 Silva Cell Q
25 113a ilfer 0
26 Filterra 0
FORMS LOADED
DESIGNER CERTIFICATION
27 Name and Title: Tr Livick,Civil Engineer
28 Organization: WSP Environment and Infrastructure,Inc._
29 Street address: 5710 Oleander Dr,Suite 110
30 City,State,Zip: -Wilmington,NC 28403
31 Phone numbers: _ [phone] _
32 LmaiL tree.livick@wsp_corn
Certification Statement:
€certify,under penalty of law that this Supplement-FS form and all supporting infnnnation 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
1 Is this a hi 1h density project? No
2 If so, number of drains a areaslSCMs 0
3 Does this proiect have low density areas? Yes
4 If so, number of low densit drains a areas 1
Is all/part of this project subject to previous rule
5 versions? No
FORMS LOADED
I9RAI1114A6E AREA INFORMA110N Entire Site LD 1
4 Type of SCM Low Denslt _ Low Densit
5 Total drainage areas ft 284,882 284,882
6 Onsite drainage areas ft 284,882 2134,882
7 Of#site drainage areas -
8 Total BUA in ro'ect sq ft 13,922 13922 sf .
- New BUA on subdivided lots(subject to permitting)
9Sjq ft ___ - -
New BUA not on subdivided lots(subject to
10 ermittinca)(M -
11 Offsite BUA
12 Breakdown of new BUA not on subdivided lots:
-Parking (sq ff) -
-Sidewalk(sq
-Roofs ft ---
-Roadwa (s fq t?
-Future LL -
-Other, please specify in the comment box
below s ft 13,922 13922 sf
New infiltrating permeable pavement on
13 subdivided Pots(sq ft) _ -New infiltrating permeable pavement not on
14 subdivided lots(sq ft - -
Existing BUA that will remain (not subject to
15 ermittin .Ls f� t) -
16 Existing BUA that is already permitted(s jc ft - -
17 Existing IBUA that will be removed s ft 6,237 6237 sf j
18 Percent BUA 5 4,89%
19 Desi n storm inches 1 1.0 in
20 Design volume of SCM cu ft 0 cf
21 Calculation method for design volume Simple Simple
ADDITI C}NAIL INFORMATION'
Please use this space to provide any additional information about the 1
22 drainage area(s):
Proposed additional BLJA(8,977 sf)accounts for the gravel access drive, concrete
entrance apron, and gravel substation shoulders.According to the NCDEQ stormwater
Design Manual(A-4; Built Upon Area), the area within the fended yard at electrical'
substations may be counted as pervious and this area has been excluded from the
overall impervious calculations:
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f

LOW DENSITY
DESIGN REQUIREMENTS FOR COW DENSITY PROJECTS FROM 02H.1003
1 is project below density thresholds set forth in the applicable starmwater 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) 3H:1V
5 Maximum velocity in the vegetated conveyances during the 10-year storm? 152
8 Are curb outlet swales proposed? No
7 Maximum longitudinal slope of curb outlet swale(s)(%) WA
8 Bottom width of curb outlet swale(s)(feet) NIA
9 Maximum side slope of curb outlet swale(s)(H:V) NIA
10 1 Minimum length of curb outlet swale(s)(feet) NIA
11 Are treatment swales used instead of curb outlet swales? NIA
12 Is starmwater released at the edge of the setback as dispersed flow? Yes
13 Have starmwater outlets been designed to prevent downslope erosion? Yes
14 ;Are variations to rule.1003 proposed? No
ADDITIONAL INFORMATION
15 Piease use this space to provide any additional information about this low density project:
Swale Drainage BUA Pervious Q Slope V,,, V,.,i Flow depth
4 Area
(ac) area C i (cfs) N [fpsl (fps) (ft)
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