SW5230901_Supplement-EZ Form_20240404

SUPPLEMENT-EZ COVER PAGE
FORMS LOADED
PROJECT INFORMATION
1 'Project Name l NCNG Camp Butner BOM Yard
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2—�I Project Area(ac) I(I 24.01
3 (Coastal Wetland Area(ac) ! 0
4 (Surface Water Area(ac) 0
-Tits this project High or Low Density? High
g 1Does this project use an off-site SCM? No
COMPLIANCE WITH 02H.1003(4)
7 Width of vegetated setbacks provided(feet) 100
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 iBioretention 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 J 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 Bavfilter 0
26 Filterra 0
FORMS WADED
DESIGNER CERTIFICATION
27 Name and Title: Frank Slinsky,P.E..Senior Project Manager
28 Organization: Timmons Group
29 Street address: 5410 Trinity Road,Suite 102
30 City.State.Zip: Raleigh,NC,27607
31 Phone number(s): [phone]
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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 _ 1
Is all/part of this project subject to previous rule
3 versions? No
FORMS LOADED
DRAINAGE AREA INFORMATION Entire Site 1
4 Type of SCM Wet Pond
5 Total BUA in project(sq ft) 225399 sf 194512 sf
New BUA on subdivided lots(subject to
6 permitting)(sq ft) sf sf
New BUA outside of subdivided lots(subject to
7 permitting)(sf) 207892 sf 194512 sf
8 Offsite-total area(sq ft)
9 Offsite BUA(sq ft)
10 Breakdown of new BUA outside subdivided lots:
-Parking(sq ft) 207892 sf 194512 sf
-Sidewalk(sq ft) sf
-Roof(sq ft) sf
-Roadway(sq ft) sf
-Future(sq ft)
-Other,please specify in the comment box
below(sq ft)
New infiltrating permeable pavement on
11 subdivided lots(sq ft) sf
New infiltrating permeable pavement outside of
12 subdivided lots(sq ft) sf
Exisitng BUA that will remain(not subject to
13 permitting)(sq ft) 17507 sf sf
14 Existing BUA that is already permitted(sq ft) sf
15 Existing BUA that will be removed(sq ft) 40203 sf 40203 sf
16 Percent BUA 22% 55%
17 Design storm(inches) 1 in
18 Design volume of SCM(cu ft) 22159 cf
19 Calculation method for design volume Simple Method
ADDITIONAL INFORMATION
Please use this space to provide any additional information about the
20 drainage area(s):

WET POND
1 Drainage area number 1 (Wet Pond)
2 Design volume of SCM(Cu ft) 22159 cf I
GENERAL MDC FROM 02H.1050
3 Is the SCM sized to treat the SW from all surfaces at build-out? Yet;
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 engineered
6 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
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)? No
If the SCM is on a single family lot,does(will?)the plat comply with
13 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 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) 451.50
21 Elevation of the main pool bottom-(top of sediment removal)(fmsl) 452.50
22 Elevation of the bottom of the vegetated shelf(fmsl) 456.00
23 Elevation of the permanent pool(fmsl) 456.50
24 Elevation of the top of the vegetated shelf(fmsl) 457.00
25 Elevation of the temporary pool(fmsl) 458.00
26 Surface area of the main permanent pool(square feet) 10466.00
27 Volume of the main permanent pool(cubic feet) 33300 cf
28 Average depth of the main pool(feet) 3.18 ft
29 Average depth equation used Equation 2
30 If using equation 3,main pool perimeter(feet) N/A
31 If using equation 3,width of submerged veg.shelf(feet) N/A
32 Volume of the forebay(cubic feet) 5127 cf
33 Is this 15-20%of the volume in the main pool? Yes
34 Clean-out depth for forebay(inches) 48 in
35 Design volume of SCM(cu ft) 22159 cf
36 Is the outlet an orifice or a weir? Orifice
37 If orifice,orifice diameter(inches) 2.00 in
38 If weir,weir height(inches) N/A
39 If weir,weir length(inches) N/A
40 Drawdown time for the temporary pool(days) 3.6
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? No
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
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 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):
The property is a 5,000 acre,state owned parcel. It is exempt from
recording drainage easements.
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