SW6240103_Supplement-EZ Form_20240119

SUPPLEMENT-EZ COVER PAGE
FORMS LOADED
PROJECT INFORMATION
1 L Project Name Leander Lee Preserve Subdivision
2 Project Area(ac) 93.56 I
i
3 Coastal Wetland Area(ac) 0
4 Surface Water Area(ac) 0.16
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 9 'If BUA is proposed in the setback, does it meet NCAC 02H 1003(4)(c d)? N/A
1 10 Is streambank stabilization proposed on this protect? No
;NUMBER AND TYPE OF SCMs: i
11 Infiltration System
_ R
12 Bioretention Cell
13 !Wet Pond
14 'Stormwater Wetland
15 Permeable Pavement g
16 Sand Filter
17 Rainwater Harvesting(RWH)
18 Green Roof
19 :Level Spreader-Filter Strip(LS-FS)
20 Disconnected Impervious Surface(DIS)
i
21 Treatment Swale
22 Dry Pond '.
23 StormFilter
24 Silva Cell
25 Bayfilter
+ 26 Filterra
FORMS LOADED
r
xDESIGNER CERTIFICATION
27 Name and Title: C. Scott Brown, PE
28 Organization: 4D Site Solutions, Inc.
' 29 Street address. 409 Chicago Drive Ste 112
30 City,State,Zip: Fayetteville, NC 28306
,
31 'Phone number(s): 910-426-6777
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 I�
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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 : 1
Is all/part of this project subject to previous rule
5 versions? No
FORMS LOADED
DRAINAGE AREA INFORMATION y n re 0 0 I
4 'ape of SCM ; Low Density ; Low Density
5 !Total drainage area(sq ft) 4,068,504 4,068t504
6 l!Onsite drainage area(sq ft) ' 4,068,504 4,068,504
7 Offsite drainage area(sq ft) 0 I
J 0
8 !Total BUA in project(sqft) 1 974284 sf ; 974284 sf
[New BUA on subdivided lots(subject to ;
.,!
9 ipermitting)(sq ft) t 725200 sf 1 725200 sf I
New BUA not on subdivided lots(subject to 1 ;
10 tpermitting)(sf) 0, 249084 sf I 249084 sf /
*.
11 !pffsite BUA(sq ft) 'r
sf
- ;
j t
12 i Breakdown of new BUA not on subdivided lots: I 1
-Parking(sq ft)
tt: 0-Sidewalk(sq ft) ;
t ./.
I
-Roof(sq ft) ; 'r
-Roadway(sq ft) ; 249084 sf 1 249084 sf
-Future(sq ft) I *
I 1
1 1 4
-Other, please specify in the comment box
Lbelow(sq ft) 0! h
1 New infiltrating permeable pavement on r I
;
13 subdivided lots(sq ft)
New infiltrating permeable pavement not on
14 j!subdivided lots(sq ft) I_ r
0!.
'Existing BUA that will remain(not subject to t 0
15 permitting)(sq ft)
16 Existing BUA that is already permitted(sq ft) I! 0 0:
I
1 i i.
17 jExisting BUA that will be removed(sq ft) 0 I
;
18 r,Percent BUA 24% 0 24%
,
19 ,Design storm(inches) !i: *
0- I
20 Design volume of SCM(cu ft)
r
!i I
21 !Calculation method for design volume 4
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ADDITIONAL INFORMATION
!Please use this space to provide any additional information about the
:22 Idrainagte area(s):
i
: I
,
1

LOW DENSITY
!DESIGN REQUIREMENTS FOR LOW DENSITY PROJECTS FROM 02H.1003 t
1 Is project below density thresholds set forth in the applicable stormwater rule? Yes
r, 2 Does project maximize dispersed flow and minimize channelization of flow? Yes 1
1 3 Has the use of piping been minimized per.1003(2)(c)? Yes
i4 Side slopes of the vegetated conveyances(H V) _ A;
1 3
5 Maximum velocity in the vegetated conveyances during the 10-year storm? 5
6 Are curb outlet swages proposed? No
1 7 Maximum longitudinal slope of curb outlet swale(s)(%) N/A )
i 8 Bottom width of curb outlet swale(s)(feet) N/A 'i
( 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?
12 Is stormwater released at the edge of the setback as dispersed flow? I
N/A/ 13 Have 1
s been
Yes
14 Are variations torr ulel.11003 proposed? No
to prevent downslope erosion? pm uu M1 Now t
ADDITIONAL INFORMATION
a 15 Please use this space to provide any additional information about this low density project: k
v
H
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Drainage Pervious
Swale BUA Q Slope VA., V.,,;,, Flow depth
# Area (ac) area C MO (%) ((ps) (fP9) (ft)
lac) tact
1 0.24 0.09 0.15 0.55 1.03 2.59 5.00 1.74 0.37
2 1.48 0.23 1.25 0.40 4.63 0.50 5.00
3 1.47 0.23 1.24 0.40 4.60 1.58 5.00 2.21 0.75
4 2.32 0.54 1.78 0.45 6.53 1.65 5.00 2.56 0.84
6 5.35 0.82 4.53 0.40 11.30 0.53 5.00 1.59 1.46
6 8.18 1.26 6.92 0.40 15.68 2.50 5.00 4.43 1.01
7 8.69 1.34 7.35 0.40 16.66 0.57 5.00 1.89 1.41
8 0.23 0.05 0.18 0.45 0.81 2.53 5.00 1.58 0.34
9 0.15 0.06 0.09 0.55 0.65 0.55 5.00 0.60 0.52
10 2.08 0.48 1.60 0.45 5.85 1.00 5.00 1.79 0.76
11 0.11 0.04 0.07 0.55 0.47 0.75 5.00 0.64 0.42
12 0.18 0.07 0.11 0.55 r 0.77 0.75 5.00 0.76 0.50
13 4.09 0.94 ' 3.15 0.45 9.72 0.60 5.00 1.60 1.13
14 1.51 0.58 0.93 0.55 4.39 1.79 ' 5.00 2.33 0.71
16 1.16 . 0.18 0.98 0.40 3.63 1.79 5.00 2.18 0.67
16 1.14 0.18 0.96 0.40 3.57 1.79 5.00 2.17 0.66
17 1.61 0.25 1.36 0.40 5.04 0.75 5.00 1.47 0.99
18 0.30 0.15 0.18 I 0.55 1.29 1.48 5.00 1.36 0.48
19 1.19 0.46 0.73 0.55 3.46 0.53 5.00 1.05 0.97
20 0.77 0.30 0.47 0.55 2.65 1.65 5.00 1.87 ' 0.61
21 0.41 _ 0.16 0.25 0.55 1.76 1.58 5.00 1.58 0.53
22 0.43 0.17 0.26 0.55 1.85 1.24 5.00 1.39 0.59
23 0.67 0.26 0.41 0,55 2.88 3.04 5.00 2.75 0.51
24 2.68 0.62 2.06 0.45 7.54 3.50 5.00 4.00 0.53
26 1.98 0.61 1.37 0.50 6.19 3.04 5.00 3.59 0.68
26 1.55 0,24 1.31 0.40 4.85 1.24 5.00 1.95 0.83
27 0.17 0.07 0.10 0.55 0.73 2.59 5.00 1.54 0.32
28
28
30