SW3230606_Supplement-EZ Form_20231005

SUPPLEMENT-EZ COVER PAGE
FORMS LOADED
PROJECT INFORMATION
1 Project Name Finger Mill
2 Project Area(ac) 24.55
3 Coastal Wetland Area(ac) 0
4 Surface Water Area(ac) 0.259
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? Yes
9 Is BUA other that as listed in.1003(4)(c-d)out of the setback? 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
FORMS LOADED
DESIGNER CERTIFICATION
27 Name and Title: Jason K.Seaman
28 Organization: Thomas&Hutton
29 Street address: 1020 Euclid Avenue
30 City,State,Zip: Charlotte,NC 28203
31 Phone number(s): 980-201-5524
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
Signature of Designer
Seal Date

DRAINAGE AREAS
1 Is this a high density project? Yes
2 If so,number of drainage areas/SCMs 1
Is all/part of this project subject to previous rule
3 versions? No
CLICK TO LOAD FORM
DRAINAGE AREA INFORMATION Entire Site POND 01 3
4 Type of SCM N/A Wet Pond
5 Total BUA in project(sq ft) 479160 sf 479160 sf
New BUA on subdivided lots(subject to
6 permitting)(sq ft) N/A N/A
New BUA outside of subdivided lots(subject to
7 permitting)(sf) 479160 sf 479160 sf
8 Offsite-total area(sq ft) 98446 sf 98446 sf
9 Offsite BUA(sq ft) N/A N/A
10 Breakdown of new BUA outside subdivided lots:
-Parking(sq ft) 157712 sf 157712 sf
-Sidewalk(sq ft) 6470 sf 6470 sf
-Roof(sq ft) 175480 sf 175480 sf
-Roadway(sq ft) 20114 sf 20114 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
11 subdivided lots(sq ft) N/A N/A
New infiltrating permeable pavement outside of
12 subdivided lots(sq ft) N/A _ N/A
Exisitng BUA that will remain(not subject to
13 permitting)(sq ft) N/A N/A
14 Existing BUA that is already permitted(sq ft) N/A N/A
15 Existing BUA that will be removed(sq ft) N/A N/A
16 Percent BUA 59% 59%
17 Design storm(inches) 1 in 1 in
18 Design volume of SCM(cu ft) 34770 cf 34770 cf
19 Calculation method for design volume Simple Simple
ADDITIONAL INFORMATION
Please use this space to provide any additional information about the
20 drainage area(s):

WET POND
1 Drainage area number Pond 01
2 Design volume of SCM(cu ft) 34770 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 engineered side slopes? No
Are the inlets,outlets,and receiving stream protected from erosion
7(10-year storm)? Yes
Is there an overflow or bypass for inflow volume in excess of the
8 design volume? Yes
DRAWDOWN
9 What is the method for dewatering the SCM for maintenance? 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 General MDC(10)? No
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 Method used SA/DA
19 Has a stage/storage table been provided in the calculations? Yes
Elevation of the excavated main pool depth(bottom of sediment
20 removal)(fmsl) 805.00
21 Elevation of the main pool bottom-(top of sediment removal)(fmsl) ■ 805.50
22 Elevation of the bottom of the vegetated shelf(fmsl) 808.00
23 Elevation of the permanent pool(fmsl) 808.50
24 Elevation of the top of the vegetated shelf(fmsl) 809.00
25 Elevation of the temporary pool(fmsl) 810.00
26 Surface area of the main permanent pool(square feet) 20951 sf
27 Volume of the main permanent pool(cubic feet) 57191 cf
28 Average depth of the main pool(feet) 2.97 ft
29 Average depth equation used Equation 3
30 If using equation 3,main pool perimeter(feet) 904.0 ft
31 If using equation 3,width of submerged veg.shelf(feet) 6.0 ft
32 Volume of the forebay(cubic feet) 13966 cf
33 Is this 15-20%of the volume in the main pool? Yes
34 Clean-out depth for forebay(inches) 42 in
35 Design volume of SCM(cu ft) I 43170 cf
36 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) 3.34
Are the inlet(s)and outlet located in a manner that avoids short-
41 circuiting? Yes
42 Are berms or baffles provided to improve the flow path? Yes
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
Does the orifice drawdown from below the top surface of the
48 permanent pool? Yes
Does the pond minimize impacts to the receiving channel from the 1
49 yr,24-hr storm? Yes
Are fountains proposed?(If Y,please provide documentation that
50 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 Fescue
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):