SW6231109_Supplement-EZ Form_20240315

SUPPLEMENT-EZ COVER PAGE
E- FORMS LOADED
PROJECT INFORMATION
1 Project Name Barker Laydown Yard
2 Project Area(ac) 104.8
3 Coastal Wetland Area(ac) 0
4 Surface Water Area(ac) 18.25
5 Is this pLoject High or Low Density? Low
6 Does this project use an off-site SCIVI? No
COMPLIANCE WITH 02H.1003(4)
7 Width of vegetated setbacks provided(feet) N/A
8 Will the vegetated setback remain vegetated? N/A
9 IfBUA 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 0
14 Stormwater Wetland 0
15 Permeable Pavement 0
16 jSand Filter 0
17 Rainwater Harvesting(RWH) 0
18 Green Roof 0
19 Level Spreader-Filter Strip(LS-FS) 1
20 Disconnected Impervious Surface(DIS) 1
21 Treatment Swale 0
22 1 Dry Pond 0
23 StormFilter 0
24 Silva Cell 0
25 Bayfilter 0
26 Filterra 0
FORMS LOADED
DESIGNER CERTIFICATION
27 Name and Title: Zacha!y Eulo,Project Manager
28 Organization: Dewberry Engineers Inc.
29 Street address: 2610 Wycliff Rd Suite#410
30 City,State,Zip: Raleigh,NC 27607
31 Phone number(s): 919-425-7610
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,We,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? No
2 If so,number of drainage areas/SCMs 0
3 Does this roiect have low densit 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
AREA INFORMATION Entire Site LID 1
4 T pe of SCM
5 Total drainage area(sq ft 4565088 4565088
6 Onsite drainage area(sq ft 4565088 4565088
7 Offsite drainage area(sq ft -
8 Total BUA in project(sq ft 306663 sf 306663 sf
New BUA on subdivided lots(subject to
9permitting) s ft - -
New BUA not on subdivided lots(subject to
10permitting) s 283140 sf 283140 sf
11 Offsite BUA(sq ft - -
12 1 Breakdown of new BUA not on subdivided lots:
Parking(sq ft
Sidewalk(sq ft
Roof(sq ft
Roadway s ft
Future(sq ft - -
Other,please specify in the comment box
below(sq ft 283140 sf 283140 sf
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
15permitting) s ft 23523 sf 23523 sf
16 Existina BUA that is already permitted(sq ft - -
17 Existing BUA that will be removed(sq ft
18 Percent BUA 7% 7 0
19 Design storm inches
20 Design volume of SCM cu ft
21 Calculation method for design volume
ADDITIONAL INFORMATION
Please use this space to provide any additional information about the
22 drainage area(s):
4:283,140 sf of gravel will be used as a temporary Iaydown yard to store
material and equipment for the construction of a linear utility project.

LOW DENSITY
DESIGN REQUIREMENTS FOR LOW DENSITY PROJECTS FROM 02H.1003
1 Is project below density thresholds set forth in the applicable stormwater rule? Yes
2 Does project maximize dispersed flow and minimize channelization of flow? Yes
3 Has the use of piping been minimized per.1003(2)(c)? Yes
4 Side slopes of the vegetated conveyances(H:V) (3:1)
5 Maximum velocity in the vegetated conveyances during the 10-year storm? 2.96
6 lAre curb outlet swales proposed? No
7 Maximum longitudinal slope of curb outlet swale(s)(%)
8 Bottom width of curb outlet swale(s)(feet)
9 Maximum side slope of curb outlet swale(s)(H:V)
10 Minimum length of curb outlet swale(s)(feet)
11 Are treatment swales used instead of curb outlet swales? No
12 1 Is stormwater released at the edge of the setback as dispersed flow? N/A
13 1 Have stormwater outlets been designed to prevent downslope erosion? Yes
14 JAre variations to rule.1003 proposed? No
ADDITIONAL INFORMATION
15 Please use this space to provide any additional information about this low density project:
elocities are based off jute lining for drainage swales.Item 12 is N/A since the nearest surface water is about 700'to the north,
so no setbacks are required.
Swale
Drainage BUA Pervious
Q Slope Flow depth
# Area (ac) area C (cfs) (/) (fps) (fps) (ft)
ac ac
1 3.00 3.00 0.00 0.95 19.96 0.30 5.00 2.96 1.50
2 2.47 2.47 0.00 0.95 18.91 0.30 5.00 2.92 1.47
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LEVEL SPREADER - FILTER STRIP (LS-FS)
11 Drainage area number 1
21 Design flow rate of SCM cfs 41.57 cfs
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)? N/A
6
Does the SCM have retaining walls,gabion walls or other
N/A
engineered side slopes?
Are the inlets,outlets,and receiving stream protected from erosion
7 10- ear storm)?
Yes
8 Is there an overflow or bypass for inflow volume in excess of the Yes
desi n volume?
9 What is the method for dewatering the SCM for maintenance? Pump(preferred)
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 by an NC licensedprofessional? Yes
LS-FS MDC FROM 02H.1059
18 Length of level spreader(feet) 418 ft
Does the LS-FS receive flow from the drainage area or another
19 No
SCM?
20 Flow rate to LS-FS during design storm(cfs) 41.57 cfs
21 Is a bypass device provided? No
22 If yes,what is the bypass device? Sized to Handle
23 Is this LS-FS designed to receive flow from the drainage area during
the 10-year storm?
241 Has a blind swale been provided? Yes
25 Does the blind swale provide for uniform overtopping of the level Yes
spreader?
26 What material will be used for the level spreader? ABC+No.57
Stone
27
Will the construction tolerance be<0.25 inch along the level
spreader length? Yes
28 WiII the level spreader be straight or convex in plan view? Yes
29 Height of the drop from the level spreader to the transition zone 1 in
inches
30 Width of the transition zone(inches) 12 in
31 Protection for the transition zone Aggregate
32 Width of the filter strip(feet) 30 ft
33 Is the filter strip free of draws and channels? Yes
34 Has this been verified in the field? Yes
35 Slope of the filter strip(%) 1.7%
36 Is this slope uniform across the entire filter strip? Yes
37 Will the first 12"of soil be adjusted if needed to promote plant Yes
growth?
38 Will the filter strip and side slopes be planted with non-clumping, Yes
deep-rooted sod?
39 Species of sod that will be used Centipede
40
Will soil be temporarily stabilized until permanent vegetation is
established? Yes
ADDITIONAL INFORMATION
41 Please use this space to provide any additional information about
the level spreader-filter strip(s):
2

DISCONNECTED IMPERVIOUS
SURFACES (DIS)
GENERAL MDC FROM 02H.1050
1 Is the SCM sized to treat the SW from all surfaces at build-out? Yes
2 Is the SCM located away from contaminated soils? Yes
3 What are the side slopes of the SCM(H:V)?
4
Does the SCM have retaining walls,gabion walls or other
No
engineered side slopes?
5 Are the inlets,outlets,and receiving stream protected from erosion Yes
10- ear storm)?
6 Is there an overflow or bypass for inflow volume in excess of the No
design volume?
7 What is the method for dewatering the SCM for maintenance? N/A
8 If applicable,will the SCM be cleaned out after construction? N/A
9 Does the maintenance access comply with General MDC(8)? Yes
10 Does the drainage easement comply with General MDC(9)? Yes
11 If the SCM is on a single family lot,does(will?)the plat comply with N/A
General MDC 10?
12 Is there an O&M Agreement that complies with General MDC(11)?
13 Is there an O&M Plan that complies with General MDC(12)?
14 Does the SCM follow the device specific MDC? Yes
15 Was the SCM designed by an NC licensedprofessional? Yes
DIS MDC FROM 02H.1060
16 Maximum roof area that will be conveyed to the VRA(sf) N/A-No Roof
17 Will the VRA be rectangular in shape?
18 Length of the rectangle in the direction of flow(feet) N/A
19 Width of the rectangle perpendicular to the direction of flow(feet) N/A
20 Will the downspouts be equipped with splash pads?
21 Length of pavement draining to the VRA(feet) 97 ft
22 Width of the VRA feet loft
23 Is the VRA free of BUA except for utility boxes,signs,and lamp Yes
posts?
24 Hydrologic Soil Group of VRA A
25 SIo e of the VRA in the direction of flow % 1%
26 Will the first 8"of soil be adjusted if needed to promote plant growth? Yes
27 Will the filter strip and side slopes be planted with non-clumping, Yes
deep-rooted sod?
28
Is there a plan to protect the VRA from erosion until permanent
Yes
round cover has taken root?
ADDITIONAL INFORMATION
29 Please use this space to provide any additional information about
the disconnected impervious surface(s):
The VRA along the access road will not be disturbed during construction.
The majority of the VRA is not disturbed at all during construction and
consists of existing, robust grass cover.
2