SW3220801_Supplement-EZ Form_20231027

SUPPLEMENT-EZ COVER PAGE
QQAD S JPPLEtit:NT FORM
'PROJECT INFORMATION
1 Project Name Stonebow Retail Center
2 Project Area(ac) 3.418
3 Coastal Wetland Area(ac) 0
4 Surface Water Area(ac) 0
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) 30
8 Will the vegetated setback remain vegetated? N/A
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 0
12 Bioretention Cell 0
13 Wet Pond 1
14 Stormwater Wetland 0
15 Permeable Pavement 0
16 Sand Filter 0
17 Rainwater Harvesting(RWH) 0
18 Green Roof 0
19 Level Spreader-Alter Strip(LS-FS) 0
20 Disconnected Impervious Surface(DIS) 0
21 Treatment Swale 0
22 Dry Pond 0
23 StormFilter 0
24 Silva Cell 0
25 Bayfilter 0
26 Filterra 0
LOAD SUPPLEMENT FORMS
DESIGNER CERTIFICATION
27 Name and Title: Frank McMahan,PE
28 Organization: Landdesign
29 Street address: 223 North Graham Street
30 City,State,Zip: Charlotte,NC,28202
31 Phone number(s): _ [phone]
32 Email: _ fmcmahan©landdesign.com
Certification Statement
certify,under penalty of law that this Supplement-E2 form and al 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.
Deslaner
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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 WETPOND
5 Total drainage area (sq ft) 156513 156513
6 Onsite drainage area (sq ft) 127987 127987
7 Offsite drainage area (sq ft) 28526 28526
8 Total BUA in project (sq ft) 90043 sf 90043 sf
New BUA on subdivided lots (subject to
9 permitting) (sq ft) N/A N/A
New BUA not on subdivided lots (subject to
10 permitting) (sf) 61517 sf 61517 sf
11 Offsite BUA (sq ft) 28526 sf 28526 sf
12 Breakdown of new BUA not on subdivided lots:
- Parking (sq ft) 32147 sf 32147 sf
- Sidewalk(sq ft) 6290 sf 6290 sf
- Roof(sq ft) 16953 sf 16953 sf
- Roadway (sq ft) 6127 sf 6127 sf
- Future (sq ft) N/A N/A
- Other, please specify in the comment box
below (sq ft) N/A N/A
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) N/A N/A
Existing BUA that will remain (not subject to
15 permitting) (sq ft) sf sf
16 Existing BUA that is already permitted (sq ft) N/A N/A
17 Existing BUA that will be removed (sq ft) sf sf
18 Percent BUA 58% 58%
19 Design storm (inches) 1.0 in
20 Design volume of SCM (cu ft) 7691 cf
21 Calculation method for design volume HYDROCAD
ADDITIONAL INFORMATION _
Please use this space to provide any additional information about the
22 drainage area(s):

WET POND
I Drainage area number 1
2 Minimum required treatment volume (cu ft) 7404 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? 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 Yes
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
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
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 623.50
removal) (fmsl)
21 Elevation of the main pool bottom (top of sediment removal) (fmsl) 624.00
22 Elevation of the bottom of the vegetated shelf(fmsl) 628.50
23 Elevation of the permanent pool (fmsl) 629.00
24 Elevation of the top of the vegetated shelf(fmsl) 629.50
25 Elevation of the temporary pool (fmsl) 630.00
26 Surface area of the main permanent pool (square feet) 5326
27 Volume of the main permanent pool (cubic feet) 17602 cf
28 Average depth of the main pool (feet) 3.30 ft
29 Average depth equation used Equation 2
_ 30 If using equation 3, main pool perimeter (feet) N/A
31 If using equation 3, width of submerged veg. shelf(feet) N/A
32 Volume of the forebay (cubic feet) 3059 cf
33 Is this 15-20% of the volume in the main pool? Yes
34 Clean-out depth for forebay (inches) 6 in
35 Design volume of SCM (cu ft) 7691 cf
_ 36 Is the outlet an orifice or a weir? Orifice
37 If orifice, orifice diameter(inches) 1.50 in
_ 38 If weir, weir height (inches) N/A
39 If weir, weir length (inches) N/A
40 Drawdown time for the temporary pool (days) 2.66
2

WET POND
41 Are the inlet(s) and outlet located in a manner that avoids short- Yes
circuiting?
42 Are berms or baffles provided to improve the flow path? No
43 Depth of forebay at entrance (inches) 48 in
44 Depth of forebay at exit (inches) 42 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 Yes
permanent pool?
Does the pond minimize impacts to the receiving channel from the 1-
49 yr, 24-hr storm? Yes
50 Are fountains proposed? (If Y, please provide documentation that No
MDC(9) is met.)
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 HYBRID
BERMUDA
54 Has a 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):
2