SW6240201_Supplement-EZ Form_20240213

SUPPLEMENT-EZ COVER PAGE
FORMS WADED
ROJECT INFORMATION
1 Project Name Langdon Preserve Subdivision
2 Project Area(ac) 35.54 1
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 SUM? No
OMPLIANCE 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 I
TO [Is streambank stabilization proposed on this project? Na I
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UMBER AND TYPE OF SCMs:
11 lInfiltration System
12 Bioretention Cell
13 !Wet Pond
i
14 'Stormwater Wetland i
15 i Permeable Pavement
16 ,Sand Fitter
17 Rainwater Harvesting(RWH)
18 (Green Roof
19 Level Spreader-Filter Strip(LS-FS)
20 Disconnected Impervious Surface(DIS)21 Treatment Swale 1
22 Dry Pond l
23 I StormFilter
24 Silva Cell
25 Bayfilter
26 ;Filters
FORMS LOADED
iESlC3NER 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 numbers) 910-426-6777
32 Email. [e-mail] 3
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
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SEAL Signature esigner
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Seal Date

)RAI NAG E AREAS
I
1 is this a high density project? No
2 If so, number of drainage areas/SCMs 0
3 !noes this project have low deneiV areas? Yes
4 1 If so,number of low density drainage areas ! 1
I Is all/part of this project subject to previous rule iI I
5 iversions? No
IFORMS LOADED I
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5 1 Total drainage area(sq ft) 1548,216 1 548,216
6 Onsite drainage area(sq ft) ..- 1 548 216 1,548,216
7 1.0ffsite draipage area(sq ft) 0 0
a -
8 Jots!BUA in project(sq ft) 370046 sf 370046 sf
New BUA on subdivided lots(subject to i
9 j.permit rig)(N.ft) II 308000 sf 308000 sf
tNew BUA not on subdivided lots(subject to 1 !
10 jpermitting)jsfl 62046 sf 62046 sf 1
0 0
11 I Offsite BUA(egit)
It-
i 0 1
12 j Breakdown of new BUA not on subdivided lots: 3 tl
I -Parking(sq ft) o i
j_ -Sidewalk(sq ft) ,,
4
i Roof(sq ft) I
....
-RoadwayN ft) . 62046 sf 1 62046 sf 1
-Futureisq ftl
-Other, please specify in the comment box
,below(sq_ft)
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New infiltrating permeable pavement on
13 jsubdivided lots(sq ft) 1 0
i
I New infiltrating permeable pavement not on
14_jsubdivided lotelsg_ft) 1 1 1
Existing BUA that will remain(not subject to
15 •iyerroitting)(sq_ft)
;
1-
16 Existing BUA that is already permitted(sq ft)
.4_
17 I r_xisting_BUA that will be removed(sq,ft)
1
18 iPercent BUA 1 24% 24%
19 tDesign storm(inches) t I
20 I Design volume of SCM(cu ft) I
21 'Calculation Method for design volume
ADDITIONAL INFORMATION
—TPlease use' this space to provide any additional information about the
22 Idrainage area(s)
1
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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
+
5 Maximum velocity in the vegetated conveyances during the 10-year storm? 5
6 Are curb outlet swales proposed? No
7 ; Maximum longitudinal slope of curb outlet swale(s)(%) N/A
8 I Bottom width of curb outlet swale(s)(feet) 1 N/A
9 Maximum side slope of curb outlet swale(s)(H:V) N/A
10 i 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? N/A
i 13 ,Have stormwater outlets been designed to prevent downslope erosion? Yes
14 i Are variations to rule.1003 proposed? No e
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ADDITIONAL INFORMATION
15 !Please use this space to provide any additional infoi i nation about this low density project
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Drainage i ' Pervious
Swale BUA Q Slope Va.., V,.,,, Flow depth
p Are
(ac) fact C (cfs) (%) (fPs) (fps) (ft)
1 1.33 0.51 0.82 0.55 5.57 0.70 4.50 1.46 1.13
2 0.13 0.04 0.09 0.50 0.49 0.70 4.50 0.63 0.43
3 0.13 0.04 0.09 0.50 0.49 0.70 4.50 0.63 0.43
4 0.91 0.21 0.70 0.45 3.13 1.20 , 4.50 I 1.64 0.72
6 0.59 0.14 0.45 0.45 2.00 0.50 4.50 0.84 0.81
6 0.78 0.18 0.60 0.45 2.67 3.70 4.50 3.41 0.43
7 2.68 0.62 2.06 0.45 9.16 5.90 6.07 ' 6.07 0.63
8 4.25 0.98 3.27 0.45 14.57 0.75 4.50 2.13 1.43
9 5.12 1.18 3.94 I 0.45 17.55 4.00 6:06 ' 6:06 0:90
10 5.16 1.19 3.97 0.45 17.66 8.50 9.07 9.07 0.54
11 5.19 1.20 3.99 0.45 17.78 6.00 7.48 ! 7.48 0.62
12 5.19 1.20 r 3.99 0.45 17.78 1.00 2.00 1.70 1.56
13 1.22 ' 0.28 0.94 0.45 4.19 1.50 4.50 j 2.07 0.74
14 0.32 0.10 0.22 0.50 1.20 2.00 4.50 1.58 0.43
15 0.80 0.25 0.56 0.50 3.06 4.30 4.50 3.16 0.32
18 (131 0.10 0:21 0.50- 1.15 ZOG 4.50 1.57 U:42'
17 0.50 , 0.15 0.35 0.50 1.91 3.50 4.50 2.58 0.42
18 0.72 0.22 0.50 0.50 2,72 0.80 4.50 1.23 0.78
18 1.12 0.34 0.77 0.50 4.25 5.50 4.45 4.45 0.49
20 0.18 0.07 0.11 0.55 0.75 6.00 4.00 2.53 0.24
21 1.32 0.40 0.91 0.50 5.00 5.50 4.39 4.39 0.37
22 2.01 0.62 1.39 0.50 7.65 1.00 4.50 1.97 0.85
22- 2.42 0.56 1.86 0.45 8.29- 2.50 4,50 3.43 0.62
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