SW5210603_Supplement-EZ Form_20211012

SUPPLEMENTE=Z COVER PAGE
ROJECT INFORMATION
1 IProlect Name
3 Coastal Wetlano Hrea ac
4 Surface Water Area ac
5 Is this project High or Low Density?
6 Does this project use an off -site SCM?
COMPLIANCE WITH 02H .1003(4
7 Width of vegetated setbacl
8 Will the vegetated setback
9 If BUA is proposed in the s
10 Is streambank stabilization
on this
NCAC
Duck Thru at SI
— ---- - -- 4.87
Yes
N/A
NUMBER
AND TYPE OF SCMs:�—_
1
Infiltration System
Bioretention Cell
Wet Pond
Stormwater Wetland
Permeable Pavement
Sand Filter
Rainwater Harvesting RWH
Green Roof
Level Spreader -Filter Strip LS-FS
Disconnected Impervious Surface DIS
Treatment Swale
Dry Pond
StomnFilter
Silva Cell
Bayfilter
Filterra
12
F11
13
14
15
16
17
18
19
20
21
22
23
24
25
26
DESIGNER CERTIFICATION i
27 Name and Title
28 Organization: -- --
29 Street address: -
31 Phone numbers
32 Email: —
J. Michael Stocks, PE Presii
Stocks Engineering, PA
801 East Washington Stre
Nashville, NC 27856
252-459.8196
.com
Certification Statement:
I certify, under penalty of law chat 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.
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Date
of Designer

DRAINAGE AREAS
1
Is this a high density project?
Yes
2
If so, number of drainage areas/SCMs
2
3
Does this project have low density areas?
No
4
If so, number of low density drainage areas
0
5
Is all/part of this project subject to previous rule
versions?
No
FORMS LOADED
DRAINAGE AREA INFORMATION
Entire Site
1
2
4
Type of SCM
Wet Pond
Wet Pond
5
Total drainage area (sq ft
218415
189255
11051
6
Onsite drainage area (sq ft)
212651
183491
11051
7
Offsite drainage area (sq ft
5764
5764
0
8
Total BUA in project (sq ft)
158592 sf
156242 sf
2350 sf
9
New BUA on subdivided lots (subject to permitting)
(sq ft
158592 sf
156242 sf
2350 sf
10
BUA not on subdivided lots (subject to
permitting) (sf)
11
Offsite BUA s ft
sf
sf
sf
F12New
Breakdown of new BUA not on subdivided lots:
- Parking (sq ft)
152196 sf
149846 sf
2350 sf
- Sidewalk (sq ft)
2196 sf
2196 sf
sf
- Roof (sq ft
4200 sf
4200 sf
sf
- Roadway (sq ft)
- Future (sq ft
- Other, please specify in the comment box
below (sq ft)
13
New infiltrating permeable pavement on
Isubdivided lots (sq ft
14
New infiltrating permeable pavement not on
subdivided lots (sq ft)
15permitting)
Existing BUA that will remain (not subject to
s ft
16
Existing BUA that is already permitted (sq ft)
17
Existing BUA that will be removed (sq ft
18
1 Percent BUA
73%
83%
21 %
19
1 Desi n storm inches
1.0 in
1.0 in
20
1 Design volume of SCM (cu ft)
12549 cf
12602 cf
21
1 Calculation method for design volume
Simple
Simple
ADDITIONAL INFORMATION
22
Please use this space to provide any additional information about the
drainage area(s):

OFF -SITE SCM
THE DRAINAGE
AREA
1
Drainage area number for this project
2
2
Master permit number
SW5200701
3
Drainage area number from the master permit
4
Lot or outparcel number
1
5
1 BUA allocated by Master Permit
3.42 acres
INFORMATION
ABOUT THE OFF -SITE SCM
6
Type of off -site SCM
Wet Pond
7
Available treatment capacity in the off -site SCM (cu ft)
6474 cf
8
Have deed restrictions limiting the BUA on the site been recorded?
No
9
Has an Engineer's Certification for the off -site SCM been submitted to DEQ?
Yes
10
Are there any Notices of Violation for the off -site system?
No
11
Has the off -site SCM been maintained in accordance with its O&M Plan?
Yes
12
Will the collections stem be maintained in its design state and ke t clean?
Yes
ADDITIONAL
INFORMATION rM
13
1 Please use this space to provide any additional information about the off -site SCM(s):
The total treatment capacity of the offsite SCM for SW5200701 is 19,076 cf. Currently, the wet pond for
SW5200701 has been permitted to treat 12,602 cf. Therefore, the available treatment capacity is 6,474 cf.

WET POND
area number
ERAL 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?
Yes
5
What are the side slopes of the SCM (H:V)?
3:1
6
Does the SCM have retaining walls, gabion walls or other engineered
side slopes?
No
7
Are the inlets, outlets, and receiving stream protected from erosion
(10-year storm)?
Yes
8
Is there an overnow or bypass for inflow volume in excess of the
design volume?
Yes
9
What is the method for clewatering the SCM for maintenance?
Pump preferred
10
If applicable, will the SCM be cleaned out after construction?
Yes
11
lDoes 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
General MDC (10)?
N/A
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
1 Was the SCM designed by an NC licensedprofessional?
Yes
WET POND
MDC FROM 02H .1053
18
Sizing method used
SA/DA
19
Has a stage/storage table been provided in the calculations?
Yes
20
Elevation of the excavated main pool depth (bottom of sediment
removal) (fmsl)
251.00
21
Elevation of the main pool bottom (top of sediment removal) (fmsl)
252.00
221
Elevation of the bottom of the vegetated shelf (fmsl)
259.00
23
Elevation of the permanent pool fmsl
260.00
24
Elevation of the top of the vegetated shelf (fmsl)
260.00
25
Elevation of the temporary pool fmsl
261.43
26
Surface area of the main permanent pool (square feet)
5762
27
Volume of the main permanent pool cubic feet
19092 cf
28
Average depth of the main pool (feet)
3.00 ft
29
Avera a depth equation used
Equation 2
30
If using equation 3, main pool perimeter (feet)
31
If using equation 3, width of submerged veg. shelf feet
32
Volume of the forebay (cubic feet)
3157 cf
33
Is this 15-20% of the volume in the main pool?
Yes
34
Clean -out depth for forebay (inches)
48 in
35
Design volume of SCM cu ft
31063 cf
361
Is the outlet an orifice or a weir?
Orifice
37
If orifice, orifice diameter inches
2 in
38
If weir, weir height (inches)
39
If weir, weir length inches
40
Drawdown time for the temporary pool (days)
2.4
41
Are the inlet(s) and outlet located in a manner that avoids short-
circuiting?
Yes
42
Are berms or baffles provided to improve the flow path?
No
43
Depth of forebay at entrance (inches)
255 in
44
Depth of forebay at exit inches
259 in
45
Does water flow out of the forebay in a non -erosive manner?
Yes
46
Width of the vegetated shelf feet
6 ft
47
Slope of vegetated shelf (H:V)
6:1
48
Does the orifice drawdown from below the top surface of the
permanent pool?
Yes
49
Does the pond minimize impacts to the receiving channel from the 1-
yr, 24-hr storm?
Yes
50
Are fountains proposed? (If Y, please provide documentation that
MDC(9) is met.)
No
51
Is a trash rack or other device provided to protect the outlet system?
Yes
52
Are the dam and embankment planted in non -clumping turf grass?
Yes
53
Species of turf that will be used on the dam and embankment
Centipede
54
Hasa planting plan been provided for the vegetated shelf?
Yes
ADDITIONAL INFORMATION
55
Please use this space to provide any additional information about the
wet pond(s):
Should the 5,764 sf of offsite drainage area become built upon The Duck Thru Pond
has an additional 18,514 cf of storage available to treat the increase in impervious
area.
Wet Pond 4 5:15 PM 10/13/2021