SW5241001_Supplement-EZ Form_20241118

SUPPLEMENT-EZ COVER PAGE
PROJECT INFORMATION
1 Project Name E Carolina Ave Subdivision
2 Project Area(ac) 22_06
3 Coastal Wetland Area(ac)
4 .Surface Water Area(ac)
b 1,Is this project High or Low Density'? High
6 Does this project use an off-site SCM? No
COMPLIANCE WITH 02H.1003(4)
l 7 Width of vegetated setbacks provided(feet) Min.30'from any applicable surface waters;
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? I No
NUMBER AND TYPE OF SCMs:
11 Infiltration System
12 Bioretention Cell
13 Wet Pond
14 Stormwater Wetland 1
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 ttiSilva Cell
25 ,Bayfilter
26 I Filterra
FORMS LOADED
DESIGNER CERTIFICATION
27 Name and Title: Jon Frazier.PE/Principal
28 Organization. FLM Engineering,Inc.
29 Street address: PO Box 91727
30 City,State,Zip: Raleigh,NC 27675
31 Phone number(s): 919.610.1051
32 Email: jfrazier©flmengineering.com
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
,`%'`Nr CAR O/''',
0PoFESSr • /'-y
SEA _ S,gnatur D signer
021
L�� NGINE *e
yA N 2/440 2-4-
Seal Date

DRAINAGE AREAS
t Is this a high density project? Yes
2 If so,number of drainage areas&SCMs 1
3 Does this project have low density areas? No
i 4 If so.number of low density drainage areas 0
Is all/part of this project subject to previous rule
5 versions? No
FORMS LOADED
DRAINAGE AREA INFORMATION Entire Site 1
4 1 Type of SCM Wetland
5 Total drainage area(sq ft) 372400
6 Onsite drainage area(so ft) 940.600 372400
7 Offsite drainage area(sq ft) _ 940,600
8 Total BUA in project(sq ft) 231325 sf 231325 sf
New BUA on subdivided lots(subject to
9 permitting)(sq ft) 132990 sf 132990 sf
New BUA not on subdivided lots(subject to
10 permitting)(sf) 98335 sf 98335 sf
11 Offsite BUA(sq ft)
12 Breakdown of new BUA not on subdivided lots:
-Parking(sq ft)
-Sidewalk(sq ft) 24295 sf 24295 sf
-Roof(sq ft)
-Roadway(sq ft) 74040 sf 74040 sf
-Future(sq ft)_
-Other,please specify in the comment box
below(sq ft)
New infiltrating permeable pavement on
13 subdivided lots(sq ft)
New infiltrating permeable pavement not on
14 subdivided lots(sq ft)
Existing BUA that will remain(not subject to
15 permitting)(sq ft)
16 Existing BUA that is already permitted Ssq ft)
17 Existing BUA that will be removed(sq ft)
18 Percent BUA 25% 62%
19 Design storm(inches) 1.0 in
20 Design volume of SCM(cu ft) 16406 cf
21 Calculation method for design volume 'Discrete Curve No.
ADDITIONAL INFORMATION
Please use this space to provide any additional information about the
22 drainage area(s):

DRAINAGE AREAS
i 1 Is this a high density project? Yes
2 If so,number of drainage areas/SCMs 1
3 Does this project have low density areas? No
4 If so,number of low density drainage areas 0
Is all/part of this project subject to previous rule
5 versions? No
FORMS LOADED
.DRAINAGE AREA INFORMATION Entire Site
4 Type of SCM
5 Total drainage area(sq ft)
6 Onsite drainage area(sq ft) 940.600
7 ' drainage area(sq ft) 940.600
8 :offsiteTotal BUA in pr ject jsq ft) 231325 sf
New BUA on subdivided lots(subject to
9 permitting)(sq ft) 132990 sf
New BUA not on subdivided lots(subject to
10 permitting)(sf) _ 98335 sf
11 i Offsite BUA(sq ft)
12 'Breakdown of new BUA not on subdivided lots:
-Parking(sq ft)
-Sidewalk(sq ft) 24295 sf
-Roof(sq ft)
-Roadway(sq ft) 74040 sf
Future(sq ft)
-Other,please specify in the comment box
below(sq ft)
New infiltrating permeable pavement on
13 subdivided lots(sq ft)
New infiltrating permeable pavement not on
14 subdivided lots(sq ft)
Existing BUA that will remain(not subject to
15 permitting)(sq ft)16 'Existing BUA that is already permitted(sq ft) —
17 .Existing BUA that will be a removed(sq ft)
18 'Percent BUA 25%
19 Design storm(inches)._
20 Design volume of SCM(cu ft)
21 iCalculation method for design volume
ADDITIONAL INFORMATION
Please use this space to provide any additional information about the
22 drainage area(s)

STORMWATER WETLAND
I Drainage area number _ 1
t 2 Minimum required treatment volume(cu ft) 15245 Cf
3.15 the SCM sized to treat the SW from all surfaces al build-out? Yes
4 Is the SCM located away from contaminated soils? Yes
5 What are the side slopes of the SCM(9V? _ 3.1
6i Does the SCM have retaining walls,gabion walls or other engineered No
side slopes?
Are the inlets,outlets,and receiving stream protected from erosion
7.(10-year stoat,))? Yes
8 Is there an overflow or bypass for inflow volume in excess of the Yes
design volume?
9i What is the method for dewatering the SCM for maintenance? Pump(preferred)
10 If applicable,will the SCM be cleaned out after construction? Yes
11 i Does the maintenance access comply with General MDC(8)? Yes
12 Does the drainage easement comply with General MDC(9)? Yes
13 If the SCM is on a single family lot,does(will?)the plat comply with Yes
General MDC(10)? _
14 Is there an O&M Agreement that compiles velh General MDC(11)? Yes
15)Is there an O&M Plan that complies with General MDC(12)? Yes
16:Does the SCM follow the device specific MDC? Yes
17 Was the SCM designed by an NC licensed professional? Yes
E H.
18I Design volume of SCM(Cu 8) 16406
Are the inlet(s)and outlet located in a manner that avoids short-
19 circuiting? Yes
20 Are berms or baffles provided to improve the flow path? No
21 Does the orifice drawdown from below the top surface of the Yes
permanent pool?
Does the wetland minimize impacts to the receiving channel from the
22 1-yr,24-hr storm? Yes
23 Is a trash rack or other device provided to protect the outlet system? Yes
Elevoftolle
24 Elevation,peak attenuation above temporary pool(if applicable)(fmsl) 350.90
2 -Elevation,temporary pool(top of the temporary inundation zone) 349 25
_,(fmsl)
26 Elevation,permanent pool(top of the shallow water zone)(fmsl) 348.00
27 Elevation,bottom of shallow water zone(fmsl) 347.25
28 Elevation,bottom of forebay deep pool at deepest point(at forebay 344.67
:entrance)(fmsl)
29'Elevation,bottom of forebay deep pool at shallowest point(at forebay 346.00
exit)(fmsl)
30 Elevation.bottom of non-forebay deep pool at deepest point(fmsl) 345.00
Planting Zones
31 Area,total surface area of the SW wetland at temporary pool elev 13,850.00
(sg ft)
32 Area,temporary inundation zone at temporary pool elev (sg ft) 4,848.00
33 Area,shallow water zone at temporarypool elev.(sg ft) 4,848.00
34 Area,forebay at temporary pool elev.(sg ft) 2,077.00
35 Area,non-forebay deep pool at temporary pool elev_(sq ft) 2.077.00
36 Percent area provided,temporary inundation zone(should be 30- %
45%)
37 Percent area provided,shallow water zone(should be 35-45%) 35%
38 Percent area provided,deep pool(forebay)(should be 10-15%) 15%
39 Percent area provided,deep pool(non-forebay)(should be 5-15%) 15%
Depths and Outlet
40 Peak attenuation depth above to porarr inundation zone(inches)._ 24 in
41 Temporary inundation zone depth(temporary pool to permanent pool) 15 in
(inches)
42 Shallow water zone depth(permanent pool to bottom of wetland) 9 in
(inches)
43 Depth,forebay at entrance(permanent pool to bottom of fix ebay 40 in
entrance)(inches)
44 Depth,forebay at exit(permanent pool to bottom of forebay exit) 24 in
(inches)
45 Depth,non-forebay deep pools(permanent pool to deep pool bottom) 36 in
(inches)
46 If there is an orifice,diameter(inches) 2 in
47 If there is a weir.weir height(inches)
48 If there is a weir,weir length(inches)
49 Drawdown time for the leinenny pool/days) 2:13
Soil and Plants
501Soil amendment depth(Inches) 12 In
511 Has a soil amendment specification been provided? Yes
52 Has a landscaping plan that meets SW Wetland MDC(12)been Yes
provided?
53 Number of plants per 200 square feet Min the shallow water zone
54 Does the temporary inundation zone planting comply with SW Yes
Wetland MDC(14)?
59 ro tho dam ctructuro and tomporary fill clopoc plantod in non Yes
clumping turfgrass? -
56)Will cattails be planted in the wetland? No
ADDITIONAL INFORMATION
57 Please use has space to provide any additional Information about the
stormwater welland(s):