SW6231109_Supplement-EZ Form_20231127

SUPPLEMENT-EZ COVER PAGE
FORMS LOADED
PROJECT INFORMATION
1 Project Name Barker Laydown Yard
2 Project Area(ac) _ 123.05
3 Coastal Wetland Area(ac) 0
4 Surface Water Area(ac) 18.25
5 Is this project High or Low Density? _ Low
6 Does this project use an off-site SCM? 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 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 0
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
L- FORMS LOADED
DESIGNER CERTIFICATION
27 Name and Title: Zachary 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,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? No
2 If so,number of drainage areas/SCMs _ 0
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 LD 1
4 Type 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
9 permitting)(sq ft) -New BUA not on subdivided lots(subject to
10 permitting)(sf) 283140 sf 283140 sf
11 Offsite BUA(sq ft) 23523 sf 23523 sf
12 Breakdown of new BUA not on subdivided lots:
-Parking(sq ft) --Sidewalk(sq ft) - -
-Roof(sgft) --Roadway(sq 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
15 permitting)(sq ft) 23523 sf 23523 sf
16 Existing BUA that is already permitted(sq ft) - -
17 Existing BUA that will be removed(sq ft)
18 Percent BUA 7% 7%
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 laydown 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? 2.74
6 Are 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 Is stormwater released at the edge of the setback as dispersed flow? N/A
13 Have stormwater outlets been designed to prevent downslope erosion? Yes
14 Are variations to rule.1003 proposed? No
ADDITIONAL INFORMATION
15 Please use this space to provide any additional information about this low density project:
Velocities are based off straw with net lining
Drainage Pervious
Swale BUA Q Slope Vallow Vans, Flow depth
Area area
(ac) (cfs) (%) (fps) (fps) (ft)
(ac) (ac)
1 3.74 3.10 0.64 0.86 12.58 0.01 5.80 2.74 0.59
2 3.00 2.51 0.49 0.86 10.09 0.01 5.80 2.55 0.52
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