SW6230804_Supplement-EZ Form_20240621

SUPPLEMENT-EZ COVER PAGE
FOGI\v;LOADED
PROJECT INFORMATION
1 Project Name Oakridge Duncan Self-Storage Phase 1
2 1Project Area(ac) 13.1
3 Coastal Wetland Area(ac)
4 1,Surface Water Area(ac) _
5 I Is this project High or Low Density? H)h
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)(cd)?
10 Is streambank stabilization proposed on this project? No
NUMBER AND TYPE OF SCMs: _-
11 Infiltration System
12 !Bioretention Cell
13 !Wet Pond
14 Stormwater Wetland
15 Permeable Pavement
16 Sand Filter 1 1
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 I Filterra
FORMS LOADED
DESIGNER CERTIFICATION
27 Name and Title: Jared Matthews.PE
28 Organization: The,Qvnry Engineering Group.PLLC
29 .Street address: 205 South Fuquay Avenue
30 City,State,Zip: Fuquay-Varina,NC 27526
31 Phone number(s): 919-552-0849
32 Email: ared cu j @ rryeng.com
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
NCARD /.
.oFEssio 2�
SEAL v('7 Signa of Designer
048484
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/iil-art tt�` Date

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? i No
FORMS LOADED
DRAINAGE AREA INFORMATION Entire Site 1
Open Bottom Sand Open Bottom Sand
4 Type of SCM Filter Filter
5 Total drainage area(sq ft) 571843 571843
6 Onsite drainage area(sq ft) 316082 316082
7 Offsite drainage area(sq ft)
8 'Total BUA in project(sq ft) 103281 sf 103281 sf
New BUA on subdivided lots(subject to permitting)
9 (sq ft)
New BUA not on subdivided lots(subject to
10 permitting)(sf)
11 Offsite BUA(sq ft)
12 Breakdown of new BUA not on subdivided lots:
-Parking(sq ft) 83985 sf 83985 sf
-Sidewalk(sq ft)
-Roof(sq ft) 17022 sf 17022 sf
-Roadway(sq ft) 2274 sf 2274 sf
-Future(sq ft) 258619 258619
-Other,please specify in the comment box
below(sq ft) 893 sf 893 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)
16 Existing BUA that is already permitted(sq ft)
17 Existing BUA that will be removed(sq ft)
18 Percent BUA 36% 36%
19 Design storm(inches) 1.0 in 1.0 in
20 Design volume of SCM(cu ft) 21613 cf 21613 cf
21 I Calculation method for design volume SCS SCS
ADDITIONAL INFORMATION
Please use this space to provide any additional information about the
22 I drainage area(s):
Line 5-Entire site,Line 6-All Drainage areas depicted from SW-03,Other in
[ 12-Offiste drainage area that is the driveway to be offset in calculations.

SAND FILTER
1 I Drainage area number _l 1
NE2'Minimum required treatment volume(cuDC ft) 6711 sf
GERAL M FROM 02N.3050
3 Is the SCM sized to treat the SW from all surfaces at build-out? 1 Yes
4 Is the SCM located away from contaminated soils? Yes
5 What are the side slopes of the SCM(H:V)? 3:1
6 Does the SCM have retaining walls,gabion walls or other engineered INo
side slopes?
7 Are the inlets,outlets,and receiving stream protected from erosion Yes
(10-year storm?
8 Is there an overflow or bypass for inflow volume in excess of the Yes
design volume?
9I What is the method for dewatering the SCM for maintenance? 1 Pump(preferred)
101If applicable,will the SCM be cleaned out after construction? 1 Yes
11 l Does the maintenance access comply with General MDC(8)? Yes
12 Does the drainage easement comply with General MDC(9)? Yes
13 If the SCM is on a single family lot,does(will?)the plat comply with N/A
I 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? 1 Yes
17 i Was the SCM designed by an NC licensed professional? Yes
;AND-FRTER MDC FROM 02H 105B
18 SHWT elevation(fmsl) 408
19 Type of sand filter(open or closed) 1 Open
20 If closed,will the filter will be pre-cast or pour-in-place?
21 If closed,top of grate elevation(fmsl) 1
2211s this sand filter desired to attenuate peak flows? 1 Yes
Sediment Chamber
23 Volume that can be retained in the sediment chamber(cubic feet) 2010 cf
J24 Will there be a permanent pool in the sediment chamber? No
251 Bottom of the sediment chamber(fmsl) 410.00
26 Area of the sediment chamber(square feet) 19867 sf
27 Physical depth of the sediment chamber(inches) 36 in
28 Ponding depth in the sediment chamber,above any permanent pool 36 in
(inches)
29 Elevation of top of weir between chambers(fmsl) 413
Sand Chamber
_ 30 Volume that can be retained in the sand chamber(cubic feet) 1 92927 of
31 Bottom of the sand chamber(fmsl) 410.00
32 Area of the sand chamber(square feet) 15679 sf
33 Physical depth of the sand chamber(inches) 56 in
34 Ponding depth in the sand chamber,above the sand surface 12 in
(inches)
35 Elevation of the bypass device(fmsl) 414
36 Type of bypass device 2x 4"Orifices
37 Mechanism for distributing flow over the sand surface I sheet flow
38 Sand specification for sand chamber Astm-33
39 Depth above underdrain pipe(inches) I 20 in
40 Will the media be maintained to drain at least two inches per hour at Yes
the sand surface? _ _
41 Is at least one clean-out pipe provided at the low point of each Yes
underdrain line?
42 Will clean-out pipes be capped? i Yes
ADDITIONAL INFORMATION -_
43 Please use this space to provide any additional information about the
sand filter(s):
Sand Filter 3 9:19 AM 6/21/2024