SW3230605_Supplement-EZ Form_20240129

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FORMS LOADED
:OJECT INFORMATION
1 Project Name Rogers Pond
2 ,Project Area(ac) 60.01
3 Coastal Wetland Area(ac) 0
4 Surface Water Area(ac) 1.56
5 Is this project High or Low Density? Both High and Low Density
6 Does this project use an off-site SCM? No
IMPLIANCE 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(4Xc-d)? Yes
10 Is streambank stabilization proposed on this project? Yes
IMBER AND TYPE OF SCMs:
11 Infiltration System
12 Bioretention Cell
13 Wet Pond 2
14 Stormwater Wetland
15 Permeable Pavement
16 Sand Filter 1
17 Rainwater Harvesting(RWH)
18 Green Roof
19 Level Spreader-Filter Strip(LS-FS)
?0 Disconnected Impervious Surface(DIS)
?1 Treatment Swale
?2 Dry Pond
?3 StormFilter
?4 Silva Cell
?5 Bayfilter
?6 Filterra
FORMS LOADED
SIGNER CERTIFICATION
?7 Name and Title: Blake H.Estridge,PE/Project Engineer
28 Organization: En-gineering Associates-Southeast,PA
?9 Street address: i ::008 Corporate Center Dr,Suite 110
30 City,State,Zip: Charlotte,NC 28226
31 Phone number(s): 704-375-2438
32 Email: [e-mail]
rCertification Statement:
'II 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 `�111IIIIIi�7
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DRAINAGE AREAS
1 Is this a high density project? Yes
2 If so,number of drainage areas/SCMs _ 3
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 Entire Site 1 2 3 LD 1
4 Type of SCM Wet Pond Wet Pond Sand Filter
5 Total drainage area(sq ft) 2730368 704149 500080 246626 1279513
6 Onsite drainage area(sq ft) 2681876 655657 500080 246626 1279513
7 Offsite drainage area(sq ft) 48492 48492 0 0 0
8 Total BUA in project(sq ft) 720421 sf 306882 sf 224851 sf 115239 sf 73449 sf
New BUA on subdivided lots(subject to
9 permitting)(sq ft) 399584 sf 177288 sf 144820 sf 77476 sf sf
New BUA not on subdivided lots(subject to
10 permitting)(sf) sf _
11 Offsite BUA(sq ft) 48492 sf 48492 sf sf sf sf
12 Breakdown of new BUA not on subdivided lots: 0
-Parking(sq ft) sf
-Sidewalk(sq ft) _ 65622 sf _ 21039 sf 20926 sf 9874 sf 13783 sf
-Roof(sq ft) sf
-Roadway(sq ft) 192570 sf 53799 sf 53705 sf 25400 sf 59666 sf
-Future(sq ft)
-Other,please specify in the comment box
below(sq ft) 14153 sf 6264 sf 5400 sf 2489 sf
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 removed(sq ft)
18 Percent BUA 45% 44% 45% 47% 6%
19 Design storm(inches) 1.0 in 1.0 in 1.0 in
20 Design volume of SCM(cu ft) 27226 cf 22345 cf 7364 cf
21 ,Calculation method for design volume Simple Method Simple Method Simple Method
ADDITIONAL INFORMATION
Please use this space to provide any additional information about the
22 drainage area(s): _
Other BUA includes driveway areas inside of public road right-of-way

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) 3:1
5 Maximum velocity in the vegetated conveyances during the 10-year storm? 5.76
6 Are curb outlet swales proposed? No
7 Maximum longitudinal slope of curb outlet swale(s)(%)
8 Bottom width of curb outlet swale(s)(feet)
9 Maximum side slope of curb outlet swale(s)(H:V)
10 Minimum length of curb outlet swale(s)(feet)
11 Are treatment swales used instead of curb outlet swales? No
12 Is stormwater released at the edge of the setback as dispersed flow? Yes
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:
Vegetated swales with high velocity have permanent reinforcement,Western Green Vmax SC250 or equal.See plans for
specifications and placement.
Drainage Pervious
Swale I BUA Q Slope Vallow Vag,, Flow depth
# Area area
(ac) (cfs) (%) (fps) (fps) (ft)
(ac) (ac)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30

SAND FILTER
1 Drainage area number 3
2 Minimum required treatment volume(cu ft) 7264 sf
GENERAL MDC FROM 02H.1050
3 Is the SCM sized to treat the SW from all surfaces at build-out? Ye&
4 Is the SCM located away from contaminated soils? Yes
5 What are the side slopes of the SCM(H:V)? 3:1
Does the SCM have retaining walls,gabion walls or other
6 No
engineered side slopes?
7 Are the inlets,outlets,and receiving stream protected from erosion Yes
(10-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
If the SCM is on a single family lot,does(will?)the plat comply with
13 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 desi ned b an NC licensed rofessional? Yes
SAND FILTER MDC FROM 02H.1056
18 SHWT elevation(fmsl) 581.5
19 Type of sand filter(open or closed) Open
20 If closed,will the filter will be pre-cast or pour-in-place?
21 If closed,top of grate elevation(fmsl)
22 Is this sand filter designed to attenuate peak flows? Yes
Sediment Chamber
23 Volume that can be retained in the sediment chamber(cubic feet) 25283 cf
24 Will there be a permanent pool in the sediment chamber? No
25 Bottom of the sediment chamber(fmsl) 589.00
26 Area of the sediment chamber(square feet) 2401 sf
27 Physical depth of the sediment chamber(inches) 72 in
28 Ponding depth in the sediment chamber,above any permanent 72 in
pool(inches)
29 Elevation of top of weir between chambers(fmsl) 590
Sand Chamber
30 Volume that can be retained in the sand chamber(cubic feet) 23882 cf
31 Bottom of the sand chamber(fmsl) 589.00
32 Area of the sand chamber(square feet) 700 sf
33 Physical depth of the sand chamber(inches) 72 in
34 Ponding depth in the sand chamber,above the sand surface 72 in
(inches)
35 Elevation of the bypass device(fmsl) 592.5
36 Type of bypass device Riser with weir
37 Mechanism for distributing flow over the sand surface Riprap weir
38 Sand specification for sand chamber ASTM C-33
39 Depth above underdrain pipe(inches) 24 in
40 Will the media be maintained to drain at least two inches per hour at] Yes
the sand surface? _
41 Is at least one clean-out pipe provided at the low point of each Yes
underdrain line? _
42 Will clean-out pipes be capped? Yes
ADDITIONAL INFORMATION
43 Please use this space to provide any additional information about
the sand filter(s):
Sand Filter 1 1:44 PM 1/25/2024