SW1230602_Supplement-EZ Form_20230929

SUPPLEMENT-EZ COVER PAGE
LOAD SUPPLEMENT FORMS
PROJECT INFORMATION ' -
1 Project Name Legacy Soccer Complex
2 Project Area(ac) 54.64
3 Coastal Wetland Area(ac) _ 0
4 Surface Water Area(ac) 0.86
5 Is this project High or Low Density? High
6 Does this project use an off-site SCM? No
!COMPLIANCE WITH 02H.1003(4) ` I
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(4)(c-d)? Yes
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-Filter 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
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DESIGNER CERTIFICATION
27 Name and Title: Jason Gaston,PLLC
28 Organization: Valor Engineering
29 Street address: 215 Boone Heights Drive#107
30 City,State,Zip: Boone,NC 28607
31 Phone number(s): 828-386-1866
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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EAL - Signature of 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 Wet Pond
5 Total drainage area (sq ft) 1436719.15 1357391.68
6 Onsite drainage area (sq ft) 1380078.63 1357391.68
7 Offsite drainage area (sq ft) 22686.95 0
8 Total BUA in project (sq ft) 400487 sf 400487 sf
New BUA on subdivided lots (subject to
9 permitting) (sq ft) sf sf
New BUA not on subdivided lots (subject to
10 permitting) (sf) 400487 sf 400487 sf
11 Offsite BUA (sq ft) sf sf
12 Breakdown of new BUA not on subdivided lots:
- Parking (sq ft) 143200 sf 143200 sf
- Sidewalk (sq ft) 67344 sf 67344 sf
- Roof(sq ft) 28915 sf 28915 sf
- Roadway (sq ft) 39740 sf 39740 sf
- Future (sq ft) sf sf
- Other, please specify in the comment box
below (sq ft) 121288 sf 121288 sf
!New infiltrating permeable pavement on
13 subdivided lots (sq ft) sf sf
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 28% 30%
19 Design storm (inches) 1.0 in 1.0 in
20 Design volume of SCM (cu ft) 35692 cf 35692 cf
21 Calculation method for design volume _ Simple Simple
ADDITIONAL INFORMATION _
Please use this space to provide any additional information about the
22 drainage area(s): _
"Other impervious" is comprised of turf soccer fields which drain via an
underdrain system to the wet pond. A diversion ditch/swale will be used on
the western portion of the parcel to divert off-site runoff from the project site
and is included on the site plans. This ditch is not considered an SCM per
our cnnversation with Rrianna Holland OA/13/2023

WET POND
I Drainage area number 1
2 Minimum required treatment volume (cu ft) 35692 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
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? Drawdown Orifice
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 1015.50
removal) (fmsl)
21 Elevation of the main pool bottom (top of sediment removal) (fmsl) 1016.00
22 Elevation of the bottom of the vegetated shelf(fmsl) 1017.00
23 Elevation of the permanent pool (fmsl) 1020.00
24 Elevation of the top of the vegetated shelf(fmsl) 1020.00
25 Elevation of the temporary pool (fmsl) 1021.50
26 Surface area of the main permanent pool (square feet) 28078
27 Volume of the main permanent pool (cubic feet) 87518 cf
28 Average depth of the main pool (feet) 3.10 ft
29 Average 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) 14860 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) 424045 cf
36 Is the outlet an orifice or a weir? Orifice
37 If orifice, orifice diameter (inches) 3 in
38 If weir, weir height (inches)
39 If weir, weir length (inches)
40 Drawdown time for the temporary pool (days) 3.19
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? _ _ Yes
43 Depth of forebay at entrance (inches) 36 in
44 Depth of forebay at exit (inches) 24 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) 3:1
48 Does the orifice drawdown from below the top surface of the No
permanent pool?
49 Does the pond minimize impacts to the receiving channel from the 1- Yes
yr, 24-hr storm?
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 Bermuda sodded
lawn
54 Has a planting plan been provided for the vegetated shelf? Yes
ADDITIONAL INFORMATION
Please use this space to provide any additional information about
55 the wet pond(s):
Wet Pond 2 9:17 AM 9/29/2023