SW3240201_Supplement-EZ Form_20240603

SUPPLEMENT-EZ COVER PAGE
PROJECT INFORMATION
1 Project Name Crosswind-Phase 5
2 Project Area() _ 37
3 Coastal Wetland Area(ac)_ 0
4 Surface Water Area(act 1
5 Is this project High or Low Density? _ High
6 Does this project use an off-site SCM7 1_ No
COMPLIANCE WITH 02H.1003(4)
7 Width of vegetated setbacks provided(feel) 30
i 8 Will the vegetated setback remain vegetated? Yes
rI9 If BUA Is proposed In the setback.does It meet NCAC 02FI.1003(4)( __ NIA
10 1Is streambank stabilization proposed on this project? No
NUMBER AND TYPE OF:SCMs:
11 jInfiltration System 0
12 Bioretention Cell 0 — - —
13 Wet Pond 1 _
14 Slormwater Wetland 0
15 Permeable Pavement 0 _ _
16 Sand Filter 0
17 Rainwater Harvesting(RWH) 0
18 Green Roof 0
19 Level Spreader-Filter MORALS-FS) 0
20 Dlsco.mected Impervious Surface DIS) 0
21 Treatment Swale 0
22.4Dry-Pond 0 -— — -
23 StormFiller 0 _24 Silva Cell 1 0 -_,
25 Bayfilter 0
26 1Friterra 0
foIMSWWADED
DESIGNER CERTIFICATION
27 Name and Tit Matthew S Kilter
28 Organization Thomas&Hutton
29 Street address 1020 Euclid Avenue
30 City.Slate.Zip Charlotte,NC 28203 l
31 Phone numberlsl 980.201-5507
32 Email kiker m£ytandh.com
D edlhnatiorl Sytalement.
I certify,under penalty of law that this Supplement-EZ form and all supporting nformation were prepared under my direction or supervision that the
information provided in the form is to the best of my knowledge and betel 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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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 N/A WET POND 6
5 Total drainage area(sq ft) 1347311 1347311
6 Onsite drainage area(sq ft) 1347311 1347311
7 Offsite drainage area(sq ft) 0 0
8 Total BUA in project(sq ft) 791862 sf 791862 sf
New BUA on subdivided lots(subject to permitting)
9 (sq ft) 520000 sf _ 520000 sf
New BUA not on subdivided lots(subject to
10 permitting)(sf) 271862 sf 271862 sf
11 Offsite BUA(sq ft) sf sf
12 Breakdown of new BUA not on subdivided lots: 0 0
-Parking(sq ft) sf sf
-Sidewalk(sq ft) 47306 sf 47306 sf
-Roof(sq ft) sf sf
-Roadway(sq ft) 116029 sf 116029 sf
-Future(sq ft) sf sf
-Other,please specify in the comment box
below(sq ft) 108527 sf 108527 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 49% 59%
19 Design storm(inches) 1.0 in 1.0 in
20 Design volume of SCM(cu ft) 88148 cf 88148 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):
For New BUA on subdivided lots,we are assuming a maximum of 5,000 SF of BUA
that includes the driveway portion within the subdivided lots.Cell 12(Other)=Curb&
Gutter AND driveway portion outside the subdivided lot.We are assuming a maximum
of 877 SF of BUA per lot for the driveway portion outside the subdivided lots.

WET POND
1 Drainage area number Pond 06
2 Minimum required treatment volume(cu ft) 65008 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 No
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
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 designed b 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 577.50
removal)(fmsl)
21 Elevation of the main pool bottom(top of sediment removal)(fmsl) 578.00
22 Elevation of the bottom of the vegetated shelf(fmsl) 582.00
23 Elevation of the permanent pool(fmsl) 582.50
24 Elevation of the top of the vegetated shelf(fmsl) 583.00
25 Elevation of the temporary pool(fmsl) 584.00
26 Surface area of the main permanent pool(square feet) 43743
27 Volume of the main permanent pool(cubic feet) _ 172326 cf
28 Average depth of the main pool(feet) 3.33 ft
29 Average depth equation used Equation 3
30 If using equation 3,main pool perimeter(feet) 1124.0 ft
31 If using equation 3,width of submerged veg.shelf(feet) _ 3.0 ft
32 Volume of the forebay(cubic feet) 33750 cf
33 Is this 15-20%of the volume in the main pool? Yes
34 Clean-out depth for forebay(inches) 54 in
35 Design volume of SCM(cu ft) 88148 cf
36 Is the outlet an orifice or a weir? Orifice
37 If orifice,orifice diameter(inches) 4 in
38 If weir,weir height(inches) -
39 If weir,weir length(inches) -
40 Drawdown time for the temporary pool(days) 2.48
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) 60 in
44 Depth of forebay at exit(inches) 54 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?
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
54 Has a planting plan been provided for the vegetated shelf? Yes
ADDITIONAL INFORMATION
Please use this space to provide any additional information about the
55 wet pond(s):
2