SW6230701_Supplement-EZ Form_20240430

SUPPLEMENT-EZ COVER PAGE
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PROJECT INFORMATION
1 Project Name Dunn Operations Center
2 Project Area(ac) 34.32
3 Coastal Wetland Area(ac) 0
4 Surface Water Area(ac) 1.48
5 Is this project High or Low Density? Both High and Low Density
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 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
12 Bioretention Cell
13 Wet Pond 2
14 Stormwater Wetland
15 Permeable Pavement
16 Sand Filter
17 Rainwater Harvesting(RWH)
18 Green Roof
19 Level Spreader-Filter Strip(LS-FS)
20 Disconnected Impervious Surface(DIS)
21 Treatment Swale
22 Dry Pond
23 Storm Filter
24 Silva Cell
25 Bayfilter
26 Filterra
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DESIGNER CERTIFICATION
27 Name and Title: Jeremy Wooster,PE,Technical Manager
28 Organization: McAdams
29 Street address: 621 Hillsborough St.Ste 500
30 City,State,Zip: Raleigh,NC 27603
31 Phone number(s): _ 919-361-5000
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
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DRAINAGE AREAS
1 Is this a high densityproiect? 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 i
4 Type of SCM Wet Pond Wet Pond N/A
5 Total drainage area(sq ft) 1957821 sf 958,748 266.723 209,038
6 Onsite drainage area(sq ft) 958.680 191,901 137,136
7 Offsite drainage area(sq ft) 68 74.822 71,902
8 Total BUA in project(sq ft) 1029160 sf 820885 sf 182666 sf 25577 sf
New BUA on subdivided lots(subject to permitting)
9 (sq ft)
New BUA not on subdivided lots(subject to
10 permitting)(sf) 947430 sf 820817 sf 107844 sf 18737 sf
11 Offsite BUA(sq ft) 81730 sf 68 sf 74822 sf 6840 sf
12 Breakdown of new BUA not on subdivided lots:
-Parking(sq ft) 754342 sf 651107 sf 103235 sf 18203 sf
-Sidewalk(sq ft) 72702 sf 70702 sf 2000 sf 534 sf
-Roof(sq ft) 101617 sf 99008 sf 2609 sf
-Roadway(sq ft)
-Future(sq ft)
-Other,please specify in the comment box
below(sq ft)
New infiltrating permeable pavement on subdivided
13 lots(sq ft)
New infiltrating permeable pavement not on
14 subdivided lots Lc ft)
Existing BUA that will remain(not subject to
15 permitting)(sq ft)
16 Existing BUA that is already permitted(sq ft)
17 Existing BUA that will be removed(sq ft)
18 Percent BUA 53% 86% 68% 12%
19 Design storm(inches) 1.0 in 1.0 in 1.0 in
20 Design volume of SCM(cu ft) 65556 cf 14811 cf
21 Calculation method for design volume Simple Method Simple Method
ADDITIONAL INFORMATION
Please use this space to provide any additional information about the
22 drainage area(s):

WET POND
1 Drainage area number A B 2 Minimum required treatment volume(Cu ft) I 65556 d I
14811 cf
GENERAL MDC FROM 02H.1050
31Is 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 engineered No No
side slopes?
7 Are the inlets,outlets,and receiving stream protected from erosion Yes Yes
(10-year storm)?
Is there an overflow or bypass for inflow volume in excess of the Yes Yes
8 design volume?
9 What is the method for dewatering the SCM for maintenance? Pump(preferred) Pump(preferred)
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
12 Does the drainage easement comply with General MDC(9)? Yes Yes
13 If the SCM is on a single family lot,does(will?)the plat comply with N/A N/A
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
yvET POND MDC FROM 02H.1053
18 Sizing method used SAIDA 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 210.00 221.00
removal)(fmsl)
21 Elevation of the main pool bottom(top of sediment removal)(fmsl) 210.50 222.00
22 Elevation of the bottom of the vegetated shelf(fmsl) 215.00 226.00
23 Elevation of the permanent pool(fmsl) 215.50 227.00
24 Elevation of the top of the vegetated shelf(fills!) 215.50 227.00
25 Elevation of the temporary pool(fmsl) 217.75 227.75
26 Surface area of the main permanent pool(square feet) 22906 20722
27 Volume of the main permanent pool(cubic feet) 88969 cf 74598 cf
28 Average depth of the main pool(feet) 3.88 ft 3.60 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 Lhe forebay(cubic feet) 17603 cf 13651 cf
33 Is this 15-20%of the volume in the main pool? Yes Yes
34 Clean-out depth for forebay(inches) 6 in 12 in
35 Design volume of SCM(cu ft) 74034 cf 21077 cf
36 Is the outlet an orifice or a weir? Orifice Orifice
37 If orifice,orifice diameter(inches) 3.50 in 2.75 in
38 If weir.weir height(inches)
39 If weir,weir length(inches)
40 Drawdown time for the temporary pool(days) 3.18 2.67
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) 60 in 60 in
44 Depth of forebay at exit(inches) 40 in 40 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 9 ft
47 Slope of vegetated shelf(H:V) 12:1 9:1
46 Does the orifice drawdown from below the top surface of the Yes 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 See Plans See Plans
54 Has a planting plan been provided for the vegetated shelf? Yes Yes
ADDITIONAL INFORMATION
55 Please use this space to provide any additional information about the
wet pond(s):
Species of turf will depend on when it is planted,see sheets C9.04 and C9.09 in the
plans for more information.