SW6241003_Supplement-EZ Form_20241029

SUPPLEMENT-EZ COVER PAGE
FORMSLOADEC
PROJECT INFORMATION
1 Project Name Turnberry South Phase 2
2 Pr ject Area(ac) 54.97
3 Coastal Wetland Area(ac) -
4 Surface Water Area(ac) -
5 Is this project High or Low Density? High
6 Does this project use an off-site SCM? No
COMPLIANCE WITH 02H.1003(4)
1 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)? _ No
`10 Is streambank stabilization proposed on this project? No
NUMBER AND TYPE OF SCMs:
11 Infiltration System - - I 0
_12 Bioretention Cell 0
13 }Wet Pond _ 3
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
FORMS LOADED
DESIGNER CERTIFICATION
27 Name and Title: Carlo Pardo,PE
28 Organization: Bowman North Carolina,Ltd.
29 Street address: 4006 Barrett Drive,Suite 104
30 City,State,Zip: Raleigh,NC 2760.9_
31 Phone number(s)- 919-553-6570
32 Email: cpardo©bowman.com
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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DRAINAGE AREAS
r 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? 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 2 3
4 Type of SCM - Wet Pond Wet Pond Wet Pond
5 Total drainage area(sq ft) 2394664 sf 906735 661365 338462
6 Onsite drainage area(sq ft) 2394664 sf 904460 661365 338462
7 Offsite drainage area(sq ft) 2275
8 Total BUA in project(sq ft) 894462 sf 467276 sf - 288601 sf 140860 sf
New BUA on subdivided lots(subject to permitting)
9 (sq ft) • 648000 sf 336000 sf 212000 sf 100000 sf
New BUA not on subdivided lots(subject to
10 •permitting)(sf) 246462 sf _ 129001 sf 76601 sf _40860 sf
11 Offsite BUA(sq ft) 2275 sf
12 Breakdown of new BUA not on subdivided lots:
-Parking(sq ft)
-Sidewalk(sq ft) _ 63806 sf 34001 sf 19925 sf 9880 sf
-Roof(sq ft)
-Roadway(sq ft) 182656 sf 95000 sf 56676 sf 30980 sf
-Future(sq ft)
-Other,please specify in the comment box
below(sq ft)
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 alreadypermitted(sq ft)
17 Existing BUA that will be removed(sq ft)
18 Percent BUA _ 37.35% _ 51.5% 43.6% 41.6%
19 Design storm(inches) 1.0 in 1.0 in 1.0 in
20 Design volume of SCM(cu ft) 76962 cf - 47828 cf 24968 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):
The 2275 sf of offsite BUA in Drainage Area 1 is from the ROW.

WET POND
1 Drainage area number 1 2 3
2 Minimum required treatment volume(cu ft) 38824 cf 24401 cf I 11975 cf
GENERAL MDC FROM 02H.1050 _
_ 3 Is the SCM sized to treat the SW from all surfaces at build-out? Yes Yes Yes
4 Is the SCM located away from contaminated soils? Yes__ Yes Yes _
5 What are the side slopes of the SCM(H:V)? 3:1 3:1 3:1 _
Does the SCM have retaining walls.gabion walls or other engineered
6 side slopes? No No No
Are the inlets,outlets,and receiving stream protected from erosion
7(10-year storm)? Yes Yes Yes
Is there an overflow or bypass for inflow volume in excess of the
8 design volume? Yes Yes Yes
9 What is the method for dewatering the SCM for maintenance? Pump(preferred) Pump(preferred_ Pump(preferred)
10 If applicable,will the SCM be cleaned out after construction? Yes _ Yes Yes _
11 Does the maintenance access comply with General MDC(8)? Yes Yes_ Yes _
12 Does the drainage easement comply with General MDC(9)? Yes _ Yes Yes _
13 If the SCM is on a single family lot,does(will?)the plat comply with N/A N/A N/A
General MDC(10)?
14 Is there an O&M Agreement that complies with General MDC(11)? Yes Yes Yes
15 Is there an O&M Plan that complies with General MDC(12)? Yes Yes _ Yes _
_16 Does the SCM follow the device specific MDC? Yes _ Yes _ Yes
17 Was the SCM designed by an NC licensed professional? Yes Yes Yes
=POND MDC FROM 02H.1053
18 Sizing method used _SA/DA SA/DA SA/DA
19 Has a stage/storage table been provided in the calculations? Yes Yes Yes _
20 Elevation of the excavated main pool depth(bottom of sediment 214.00 222.00 228.00
removal)(fmsl)
21 Elevation of the main pool bottom(top of sediment removal)(fmsl) 215.00 223.00 229.00
22 Elevation of the bottom of the vegetated shelf(fmsL 218.50 _ 226.50 232.50
23 Elevation of the permanent pool(fmsl) 219.00 _ 227.00 _ 233.00
24 Elevation of the top of the vegetated shelf(fmsl) 219.50 227.50 233.50
25 Elevation of the temporary pool(fmsl) 220.40 228.10 234.30
26 Surface area of the main permanent pool(square feet) 36610 30140 12760 -
27 Volume of the main permanent pool(cubic feet) 118903 cf _ 99833 cf _ 39255 cf
_ 28 Average depth of the main pool(feet) 3.51 ft _ 3.55 ft 3.39 ft
29 Average depth equation used Equation 3 __ Equation 3 Equation 3
30 If using equation 3,main pool perimeter(feet) 920.0 ft _ 720.0 ft 430.0 ft
_ 31 If using equation 3.width of submerged veg.shelf(feet) 3.0 ft 3.0 ft 3.0 ft
32 Volume of the forebay(cubic feet) 21750 cf _ 18520 cf 1613 cf
_ 33 Is this 15-20%of the volume in the main pool? Yes _ Yes Yes
34 Clean-out depth for forebay(inches) 48 in _ 42 in T 48 in _
35 Design volume of SCM(cu ft) 76962 cf _ 47828 cf 24968 cf
36 Is the outlet an orifice or a weir? Orifice Orifice _ Orifice
37 If orifice,orifice diameter(inches) 2.70 in 2.50 in 2.00 in
38 If weir.weir height(inches)
39 If weir,weir length(inches)
40 Drawdown time for the temporary pool(days) 4.7 4.34 3.29 _
41 Are the inlet(s)and outlet located in a manner that avoids short- Yes Yes Yes
circuiting?
42 Are berms or baffles provided to improve the flow path? Yes __ Yes Yes
~43 Depth of forebay at entrance(inches) 36 in _ 30 in _ 36 in ___
44 Depth of forebay at exit(inches) 24 in 24 in 24 in
45 Does water flow out of the forebay in a non-erosive manner? Yes Yes Yes
46 Width of the vegetated shelf(feet) E ft 6 ft 6 ft
47 Slope of vegetated shelf(H:V) 6:1 _ 6:1 6:1
48 Does the orifice drawdown from below the top surface of the Yes Yes Yes
permanent pool?
49 Does the pond minimize impacts to the receiving channel from the 1- Yes Yes Yes
yr,24-hr storm?
50 Are fountains proposed?(If Y,please provide documentation that No No No
MDC(9)is met.)
51 Is a trash rack or other device provided to protect the outlet system? Yes Yes Yes
52 Are the dam and embankment planted in non-clumping turf grass? Yes Yes Yes
53 Species of turf that will be used on the dam and embankment Hybrid Bermuda `Hybrid Bermuda Hybrid Bermuda
54 Has a planting plan been •rovided for the ve•etated shelf? Yes Yes Yes
ADDITIONAL INFORMATION
55 Please use this space to provide any additional information about the
wet pond(s)_
Wet Pond 1 10:24 AM 8/6/2024