SW6231105_Supplement-EZ Form_20240306

SUPPLEMENT-EZ COVER PAGE
FORMS LOADED
PROJECT INFORMAMQN '
1 Project Name Hilton Heights 72 Unit Relocation
2 Project Area(ac) 30.34
3 Coastal Wetland Area(ac) 0
4 Surface Water Area(ac) 0.5
5 Is this project High or Low Density? High
6 Does this project use an off-site SCM? No
COMPLIANCE WITH 02H.1003(4)
7 Width of vegetated setbacks provided(feet) 100
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? 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 Silva Cell
25 Bayfilter
26 Filterra
FORMS LOADED
DESIGNER CERTIFICATION
27 Name and Title: Ana Wadsworth,PE
28 Organization: _ The Wooten Company
29 Street address: 120 N Boylan Ave.
30 City,State,Zip: Raleigh,NC,27603
31 Phone number(s): 919-828-0531
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
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Seal Date

DRAINAGE AREAS
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 1
4 Type of SCM Wetland
5 Total drainage area(sq ft) 1343276 378885
6 Onsite drainage area(sq ft) 1343276 378885 _
7 Offsite drainage area(sq ft) 0 0
8 Total BUA in project(sq ft) 220678 sf 204380 sf _
New BUA on subdivided lots(subject to permitting)
9 (sq ft) sf sf
New BUA not on subdivided lots(subject to
10 permitting)(sf) 220678 sf 204380 sf
11 Offsite BUA(sq ft) sf sf
12 Breakdown of new BUA not on subdivided lots:
-Parking(sq ft) 65537 sf 61239 sf
-Sidewalk(sq ft) 19400 sf 19360 sf
-Roof(sq ft) 42484 sf 41279 sf
-Roadway(sq ft) sf sf
-Future(sq ft) 93257 sf 82502 sf
-Other,please specify in the comment box
below(sq ft)
New infiltrating permeable pavement on
13 subdivided lots(sq ft) n/a n/a
New infiltrating permeable pavement not on
14 subdivided lots(sq ft) sf sf
Existing BUA that will remain(not subject to
15 permitting)(sq ft) sf sf
16 Existing BUA that is already permitted(sq ft) sf sf
17 Existing BUA that will be removed(sq ft) sf sf
18 Percent BUA 16% 54%
19 Design storm(inches) n/a 1.0 in
20 Design volume of SCM(cu ft) n/a 10145 cf
21 Calculation method for design volume n/a Simple
ADDITIONALD FORMATION
Please use this space to provide any additional information about the
22 drainage area(s):

STORMWATER WETLAND
1 Drainage area number 1
2 Minimum required treatment volume(cu ft) 1039 cf
GENERAL MDC FROM 02H.1050
3 Is the SCM sized to treat the SW from all surfaces at build-out? Yes
4 Is the SCM located away from contaminated soils? I Yes
5 What are the side slopes of the SCM(H:V)? _I 3:1
6 Does the SCM have retaining walls,gabion walls or other engineered No
side slopes?
7 Are the inlets,outlets,and receiving stream protected from erosion(10- Yes
year storm)?
8 Is there an overflow or bypass for inflow volume in excess of the Yes
design volume?
9 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 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 N/A
General MDC(10)?
14 Is there an O&M Agreement that complies with 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
STORMWATER WETLAND MDC FROM 02H.1054 18 Design volume of SCM(cu ft) 10144.8
19 Are the inlet(s)and outlet located in a manner that avoids short- Yes
circuiting?
20 Are berms or baffles provided to improve the flow path? Yes
21 Does the orifice drawdown from below the top surface of the No
permanent pool?
22 Does the wetland minimize impacts to the receiving channel from the 1- Yes
yr,24-hr storm?
23 Is a trash rack or other device provided to protect the outlet system? Yes
Elevations
24 Elevation,peak attenuation above temporary pool(if applicable)(fmsl) 134.94
25 Elevation,temporary pool(top of the temporary inundation zone)(fmsl) 134.00
26 Elevation,permanent pool(top of the shallow water zone)(fmsl) 133.00
27 Elevation,bottom of shallow water zone(fmsl) 132.25
28 Elevation,bottom of forebay deep pool at deepest point(at forebay
entrance)(fmsl) 129.50
29 Elevation,bottom of forebay deep pool at shallowest point(at forebay 130.00
exit)(fmsl)
30 Elevation,bottom of non-forebay deep pool at deepest point(fmsl) 131.00
Planting Zones
31 A)ea,totalsurface area of the SW wetland at temporary pool elev. 20,331.00
ft
32 Area,temporary inundation zone at temporary pool elev.(sq ft) 6,729.00
33 Area,shallow water zone at temporary pool elev.(sq ft) 8,154.00
34 Area,forebay at temporary pool elev.(sq ft) 2,849.00
35 Area,non-forebay deep pool at temporary pool elev.(sq ft) 2,599.00
36 Percent area provided,temporary inundation zone(should be 30-45%) 33%
37 Percent area provided,shallow water zone(should be 35-45%) 40%
38 Percent area provided,deep pool(forebay)(should be 10-15%) 14%
39 Percent area provided,deep pool(non-forebay)(should be 5-15%) 13%
Depths and Outlet
40 Peak attenuation depth above temporary inundation zone(inches) 11 in
41 Temporary inundation zone depth(temporary pool to permanent pool) 12 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 forebay 42 in
entrance)(inches)
44 Depth,forebay at exit(permanent pool to bottom of forebay exit) 36 in
(inches)
45 Depth,non-forebay deep pools(permanent pool to deep pool bottom) 24 in
(inches)
46 If there is an orifice,diameter(inches)
47 If there is a weir,weir height(inches) 9 in
48 If there is a weir,weir length(inches) 22 in
49 Drawdown time for the temporary pool(days) 4.2
Wetland 1 1:20 PM 3/5/2024

STORMWATER WETLAND
Soil and Plants
50 Soil amendment depth(inches) 12 in
51 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(#)in the shallow water zone: 50
54 Does the temporary inundation zone planting comply with SW Wetland Yes
MDC(14)?
55 Are the dam structure and temporary fill slopes planted in non- Yes
clumping turfgrass?
561 Will cattails be planted in the wetland? No
ADDITIONAL INFORMATION
57 Please use this space to provide any additional information about the
stormwater wetland(s):
This wetland also provides rate control per local ordinances.
Wetland 2 1:20 PM 3/5/2024