SW6240504_Supplement-EZ Form_20240607

SUPPLEMENT-EZ COVER PAGE
FORMS LOADED
PROJECT INFORMATION
1 i Project Name Tri-County Subdivision
2 Project Area(ac) 9.6 ---
3 Coastal Wetland Area(ac) 0
4 Surface Water Area(ac) i 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 Width of vegetated setbacks provided(feet) 30
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
10 Is streambank stabilization proposed on this project? 1 No
NUMBER AND TYPE OF SCMs:
11 Infiltration System
12 Bioretention Cell
13 Wet Pond
14 Stormwater Wetland
15 Permeable Pavement
16 Sand Filter
17 Rainwater Harvesting(RWH)
18 Green Roof
19 Level Spreader-Filter Strip(LS-FS)
20 Disconnected Impervious Surface(DIS)
21 Treatment Swale
22 Dry Pond — — --- — — — - _�
23 StormFilter
24 Silva Cell
25 Bayfilter �_-.-
26 Filters
FORMS LOADED
DESIGNER CERTIFICATION a _
27 'Name and Title: Kenneth W.Smith Jr.,PE PLS
28 Organization: Smith Site Consultants,PLLC. NC Firm#P-2144
29 Street address: 121 Bulittle Drive
30 City,State,Zip: Linden,NC 28356
31 Phone number(s): 910-391-5923
32 Email: [e-mail]
Certification 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 01 I 111
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Signature of Designer
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Seal Date

DRAINAGE AREAS
1 Is this a high density project? No •---i
2 If so,number of drainage areas/SCMs 0 f
3 Does this project have low density areas? Yes 1
4 If so,number of low density drainage areas 1
Is all/part of this project subject to previous rule
5 versions? No
FORMS LOADED
'DRAINAGE AREA INFORMATION 1 Entire Site LD 1
4 Type of SCM N/A N/A
5 'Total drains a area(sq ft) _ 418180 418180
6 Onsite drains a area(s ft) 418180 418180
7 iOffsite drainage area(sq ft) - 0 0
_8 Total BUA in project(sq ft) _ 100363 sf 100363 sf
New BUA on subdivided lots(subject to permitting)'
9 sq ft) 67590 sf 67590 sf
New BUA not on subdivided lots(subject to i
10 permiin )(sf) 32773 sf 32773 sf
' 11 Offsite BUA(s ft) none none j
12 Breakdown of new BUA not on subdivided lots: 2
Parking(sq ft) AO
-Sidewalk(sq ft)
-Roof(sq ft)
i -Roadway(sq ft) 32634 sf , 32634 sf j
-Future(sq ft)
I -Other,please specify in the comment box P
below(sq ft)mm 139 sf 139 sf F13New infiltrating permeable pavement on jj
subdivided lots(sq ft) N/A N/A n
New infiltrating permeable pavement not on
14 subdivided lots(sq ft) N/A N/A
Existing BUA that will remain(not subject to
15 permitting)(sq ft) N/A N/A iI
16 Existing_BUA that is already permitted(s ft) N/A N/A _1,
17 j Existing BUA that will be removed(sq ft) N/A N/A ,
18 Percent BUA _ 24% 24%
19 Design storm(inches) — 1.0 in 1.0 in 4
20 JDesign volume of SCM(cu ft) N/A N/A
21 !Calculation method for design volume N/A N/A
ADDITIONAL INFORMATION
Please use this space to provide any additional information about the
22 'drainage area(s):
"Other"BUA item is for the concrete access&pad for the new mail kiosk
i

LOW DENSITY
1DESit5N Ui N 'i-:. LO,Jv DEN31177 { t EL t 3;-,t0m uz:-..1035
1 1 Is project below density thresholds set forth in the applicable stormwater rule? i Yes Bpi
2 Does project maximize dispersed flow and minimize channelization of flow? Yes 1
3 Has the use of piping been minimized per.1003(2)(c)? Yes
4 Side slopes of the vegetated conveyances(H:V) 3 to 1
5 Maximum velocity in the vegetated conveyances during the 10-year storm? 1.29 j
6 Are curb outlet swales proposed? No P
7 Maximum longitudinal slope of curb outlet swale(s)(%) j n/a
8 Bottom width of curb outlet swale(s)(feet) n/a
—11
9 Maximum side slope of curb outlet swale(s)(H:V) iT n/a
i10 Minimum length of curb outlet swale(s)(feet) n/a
-11
11 Are treatment swales used instead of curb outlet swales? Yes
12 Is stormwater released at the edge of the setback as dispersed flow? Yes J
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:
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SEE THE ATTACHED SHEET FOR ALL SWALES INFORMATION p w

Drainage Pervious Vactual Flow
Swale# Area(ac) BUA(ac) area(ac) C Q(cfs) Slope(%) Vauow(fps) (fps) Depth(ft)
1 0.67 0.19 0.48 0.39 1.47 0.30 5.00 0.79 0.73
2 0.14 0.05 0.09 0.45 0.35 0.30 5.00 0.54 0.43
3 0.06 0.05 0.01 0.71 0.26 0.30 5.00 0.51 0.38
4 0.09 0.02 0.07 0.38 0.18 0.30 5.00 0.47 0.33
5 0.13 0.06 0.07 0.51 0.37 1.25 5.00 0.97 0.33
6 0.10 0.03 0.07 0.43 0.23 1.25 5.00 0.84 0.28
7 0.30 0.08 0.22 0.39 1.47 0.30 5.00 0.79 0.73
8 1.09 0.33 0.76 0.41 2.50 0.30 5.00 0.90 0.89
9 0.36 0.12 0.24 0.44 0.87 0.30 5.00 0.69 0.60
10 1.44 0.38 1.06 0.38 7.95 0.30 5.00 1.21 1.37
11 0.28 0.09 0.19 0.43 2.13 0.30 5.00 0.86 0.84
12 0.47 0.03 0.44 0.25 8.61 0.30 5.00 1.24 1.41
13 0.22 0.05 0.17 0.36 0.44 0.50 5.00 0.71 0.42
14 0.12 0.05 0.07 0.50 0.33 0.50 5.00 0.65 0.38
15 0.12 0.00 0.12 0.20 11.63 0.25 5.00 1.29 1.43