SW5240102_Supplement-EZ Form_20240423

SUPPLEMENT-EZ COVER PAGE
PROJECT INFORMATION
1 Project Name Jeffery Way Commercial
2 Project Area(ac) 2.06
3 Coastal Wetland Area(ac) 0
4 Surface Water Area(ac) 0
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) 0
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 stream bank stabilization proposed on this project? No
NUMBER AND TYPE OF SCMs:
11 Infiltration System
12 Bioretention Cell 1
13 Wet Pond
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 StormFilter
24 Silva Cell
25 Bayfilter
26 Filterra
FORMS LOADED
DESIGNER CERTIFICATION
27 Name and Title Keith P Gettle, PE/Principle
28 Organization: Gettle Engineering and Design, PLLC
29 Street address: 3616 Waxwing Ct
30 City,State,Zip: Wake Forest, NC 27587
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 1
3 Does this project have low density areas? No
4 If so,number of low density drainage areas 0
Is all/part of this project subject to previous rule
5 versions? No
DRAINAGE AREA INFORMATION Entire Site 1
4 Type of SCM Bioretention Cell
5 Total drainage area(sq ft) 69696
6 Onsite drainage area(sq ft) 69146
7 Offsite drainage area(sq ft) 550
8 Total BUA in project(sq ft) 61028 sf
New BUA on subdivided lots(subject to permitting)
9 (sq ft) sf
New BUA not on subdivided lots(subject to
10 permitting)(sf) sf
11 Offsite BUA(sq ft) sf
12 Breakdown of new BUA not on subdivided lots:
-Parking(sq ft) 24974 sf
-Sidewalk(sq ft) 1634 sf
-Roof(sq ft) 20000 sf
-Roadway(sq ft)
-Future(sq ft) sf
-Other, please specify in the comment box
below(sq ft) 14420 sf
New infiltrating permeable pavement on subdivided
13 lots(sq ft) sf
New infiltrating permeable pavement not on
14 subdivided lots(sq ft) sf
Existing BUA that will remain(not subject to
15 permitting)(sq ft) sf
16 Existing BUA that is already permitted(sq ft) N/A
17 Existing BUA that will be removed(sq ft) 18731 sf
18 Percent BUA 68%
19 Design storm(inches) 5.4 in
20 Design volume of SCM(cu ft) 6177 cf
21 Calculation method for design volume Rational
ADDITIONAL INFORMATION
Please use this space to provide any additional information about the
22 drainage area(s).
Other=Gravel Area,Parking to inlude paved area and drive aisle

BIORETENTION CELL
1 Drainage area number 1
2 Minimum required treatment volume(cu ft) 4864 cf
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)? 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)? Yes
If the SCM is on a single family lot,does(will?)the plat comply with
13 General MDC(10)? N/A
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
BIORETENTION CELL MDC FROM 02H.1052
18 SHWT elevation(fmsl) 417.50
19 Bottom of the bioretention cell(fmsl) 419.50
20 Ponding depth of the design storm(inches) 10 in
21 Surface area of the bioretention cell(square feet) 5645 sf
22 Design volume of SCM (cu ft) 6177 cf
23 Is the bioretention cell used for peak attenuation? Yes
24 Depth of peak attenuation over planting surface(in) 10 in
25 Height of peak attenuation outlet above the planting surface(in) 12 in
26 Infiltration rate of the in situ soil(inch/hour) 1 in/hr
27 Diameter of the underdrain pipes(if applicable) 4 in
28 Does the design include Internal Water Storage(IWS)? Yes
29 if so,elevation of the top of the IWS(fmsl) 421.5
30 Elevation of the planting surface(fmsl) 423
31 other)? Grass
32 Media depth(inches) 30 in
33 Percentage of medium to coarse washed sand by volume 85%
34 Percentage of fines(silt and clay)by volume 10%
35 Percentage of organic matter by volume 10%
36 Type of organic material Pine Bark
37 Phosphorus Index(P-Index)of media(unitless) 29
38 Will compaction be avoided during construction? Yes
39 Will cell be maintained to a one inch/hour standard? Yes
40 Depth of mulch,if applicable(inches) 2 in
41 Type of mulch,if applicable Pine Bark
42 How many clean out pipes are being installed? 7
43 Type of pretreatment that will be used: Grass/Rip rap
ADDITIONAL INFORMATION
Please use this space to provide any additional information about the
44 bioretention cell(s):
Grass pre-treatment for the surface runoff from the parking lot to the SCM.
Inflow pipes discharge to rip rap aprons as noted on the plans.
Bioretention 1 10:14 AM 4/18/2024