SW3170303_Supplement-EZ Form_20240701

SUPPLEMENT-EZ COVER PAGE
FORMS LOADED
PROJECT INFORMATION
1 Project Name ALLEN STORAGE
2 Project Area(ac) 107.31
3 Coastal Wetland Area(ac) 0
4 Surface Water Area(ac) 1.67
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) 20
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)? 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 2
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 1Name and Title: C.Matthew Jones,P.E.(Principal Engineer)
28 Organization: Jones Civil Design,P.C.
29 Street address: 1019 Thornsby Lane
30 City,State,Zip: Matthews,NC 28105
31 Phone number(s): [phone]
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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DRAINAGE AREAS
1 Is this a high density project? Yes
2 If so,number of drainage areas/SCMs 2
3 Does this project have low density areas? Yes
4 If so,number of low density drainage areas 1
Is all/part of this project subject to previous rule
5 versions? No
FORMS LOADED
DRAINAGE AREA INFORMATION Entire Site 1 2 LD 1
4 Type of SCM N/A Previous Basin Proposed Basin N/A
5 Total drainage area(sq ft) 4,674,308 692604 884704 3,097,000 _
6 Onsite drainage area(sq ft) 4,674,308 692604 884704 3,097,000
7 Offsite drainage area(sq ft) 0 0 0 0
8 Total BUA in project(sq ft) 707850 sf 329314 sf 378536 sf
New BUA on subdivided lots(subject to
9 permitting)(sq ft)
New BUA not on subdivided lots(subject to
10 permitting)(sf) 707850 sf 329314 sf 378536 sf
11 Offsite BUA(sq ft)
12 Breakdown of new BUA not on subdivided lots:
-Parking(sq ft) 220021 sf 220021 sf
-Sidewalk(sq ft)
-Roof(sq ft) 187869 sf 187869 sf
-Roadway(sq ft) 299960 sf 141445 sf 158515 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 already permitted(sq ft) 329314 sf
17 Existing BUA that will be removed(sq ft)
18 Percent BUA 15% 48% 43% 0%
19 Design storm(inches) 1.0 in 4.8 in 7.4 in
20 Design volume of SCM(cu ft) N/A 277042 cf 545567 cf
21 Calculation method for design volume Rational Rational Rational
ADDITIONAL INFORMATION
Please use this space to provide any additional information about the
22 drainage area(s):

WET POND
fl Drainage area number 1 2
_ 2 Minimum required treatment volume(cu ft) 27585 cf I 32439 cf I
GENERAL MDC FROM 02H.1050
3 Is the SCM sized to treat the SW from all surfaces at build-out? Yes Yes
4 Is the SCM located away from contaminated soils? Yes Yes
5 What are the side slopes of the SCM(H:V)? _ 3:1 _ 3:1 _
6 Does the SCM have retaining walls,gabion walls or other No No
engineered side slopes?
7 Are the inlets,outlets,and receiving stream protected from erosion Yes Yes
(10-year storm)?
8 Is there an overflow or bypass for inflow volume in excess of the Yes Yes
design volume?
9 What is the method for dewatering the SCM for maintenance? Drawdown Orifice Drawdown Orifice
10 If applicable,will the SCM be cleaned out after construction? Yes Yes
11 Does the maintenance access comply with General MDC(8)? Yes Yes 1
12 Does the drainage easement comply with General MDC(9)? Yes Yes _
If the SCM is on a single family lot,does(will?)the plat comply with
13 Yes Yes
General MDC(10)?
14 Is there an O&M Agreement that complies with General MDC(11)? Yes Yes
15 Is there an O&M Plan that complies with General MDC(12)? Yes Yes
16 Does the SCM follow the device specific MDC? Yes Yes
17 Was the SCM designed by an NC licensed professional? Yes Yes
WET POND MDC FROM 02H.1053
18 Sizing method used SA/DA SA/DA
19 Has a stage/storage table been provided in the calculations? Yes _ Yes
20 Elevation of the excavated main pool depth(bottom of sediment 511.00 511.00
removal)(fmsl)
21 Elevation of the main pool bottom(top of sediment removal)(fmsl) 512.00 512.00
22 Elevation of the bottom of the vegetated shelf(fmsl) 514.50 515.50
23 Elevation of the permanent pool(fmsl) 515.00 516.00 _
24 Elevation of the top of the vegetated shelf(fmsl) 515.50 516.50
25 Elevation of the temporary pool(fmsl) 517.00 518.00
26 Surface area of the main permanent pool(square feet) 19042 43217
27 Volume of the main permanent pool(cubic feet) 53792 cf 195053 cf
28 Average depth of the main pool(feet) 3.57 ft 3.12 ft
29 Average depth equation used Equation 2 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) 8069 cf 30309 cf
33 Is this 15-20%of the volume in the main pool? Yes Yes
34 Clean-out depth for forebay(inches) 6 in 6 in
35 Design volume of SCM(cu ft) 27585 cf 32439 cf
36 Is the outlet an orifice or a weir? Orifice Orifice
37 If orifice,orifice diameter(inches) 4 in 3 in
38 If weir,weir height(inches)
39 If weir,weir length(inches)
40 Drawdown time for the temporary pool(days) 2.5 2.5
41 Are the inlet(s)and outlet located in a manner that avoids short- Yes Yes
circuiting? _
42 Are berms or baffles provided to improve the flow path? No No
43 Depth of forebay at entrance(inches) 36 in 36 in
44 Depth of forebay at exit(inches) 24 in 24 in
45 Does water flow out of the forebay in a non-erosive manner? Yes Yes
46 Width of the vegetated shelf(feet) 6 ft 6 ft
_ 47 Slope of vegetated shelf(H:V) 6:1 6:1 _
48 Does the orifice drawdown from below the top surface of the No Yes
permanent pool?
49 Does the pond minimize impacts to the receiving channel from the 1- Yes Yes
yr,24-hr storm?
50 Are fountains proposed?(If Y,please provide documentation that No No
MDC(9)is met.)
51 Is a trash rack or other device provided to protect the outlet system? Yes Yes
52 Are the dam and embankment planted in non-clumping turf grass? Yes Yes
53 Species of turf that will be used on the dam and embankment _ Fescue Fescue
54 Has a planting plan been provided for the vegetated shelf? L No No
ADDITIONAL INFORMATION •
55 Please use this space to provide any additional information about the
wet pond(s):
2