SW3230603_Supplement-EZ Form_20231215

SUPPLEMENT-EZ COVER PAGE
ORMS LOADI
PROJECT INFORMATION
1 Project Name Dollar General Store#25122
2 Project Area ac 2.61
3 Coastal Wetland Area ac 0
4 Surface Water Area ac 0
5 Is this project High or Low Density? Both High and Low Density
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? N/A
9 If BUA is proposed in the setback,does it meet NCAC 02H.1003 4 c-d? N/A
10 1 Is streambank stabilization proposed on this project? No
NUMBER AND TYPE OF SCMs:
11 Infiltration S stem
12 Bioretention Cell
13 Wet Pond
14 Stormwater Wetland
15 Permeable Pavement
16 Sand Filter 1
17 Rainwater Harvesting RWH
18 Green Roof
19 Level Spreader-Filter Stri LS-FS
20 Disconnected Impervious Surface DIS
21 Treatment Swale
22 Dry Pond
23 StormFilter
24 Silva Cell
25 Ba filter
26 IFilterra
FORMS LOADED
DESIGNER CERTIFICATION
27 Name and Title: Justin Church,PE-Principal Engineer
28 Or anization: BREC,PA
29 Street address: 1520 Meadowview Drive
30 City,State,Zip: Wilkesboro,NC 28697
31 Phone numbers : 336 844-4088
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
H CARO '''
Q SEAL < = Signature o Designer
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r/N C. C 12/15/2023
Date

DRAINAGE AREAS
1 Ils this a high density project? Yes
2 If so,number of drainage areas/SCMs 1
3 Does this roject 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 1 LID 1
4 T pe of SCM SAND FILTER
5 Total drainage area(sq ft 114,765 59,844 54921
6 Onsite draina a area(sq ft 113 880 58 959 54921
7 Offsite drainage area(sq ft 885 885 0
8 Total BUA in project(sq ft 45754 sf 44064 sf 1690 sf
New BUA on subdivided lots(subject to
9permitting) s ft sf sf sf
New BUA not on subdivided lots(subject to
10permitting) s 44869 sf 43179 sf 1690 sf
11 Offsite BUA(sq ft 885 sf 885 sf sf
12 Breakdown of new BUA not on subdivided lots:
-Parking(sq ft 30070 sf 28380 sf 1690 sf
-Sidewalk(sq ft 2005 sf 2005 sf sf
-Roof(sq ft 12794 sf 12794 sf sf
-Roadway s ft sf sf sf
-Future(sq ft sf sf sf
-Other,please specify in the comment box
below(sq ft sf sf sf
New infiltrating permeable pavement on
13 subdivided lots(sq ft sf sf sf
New infiltrating permeable pavement not on
14 subdivided lots(sq ft sf sf sf
Existing BUA that will remain(not subject to
15permitting) s ft sf sf sf
16 lExistina BUA that is already permitted (sq ft sf sf sf
17 Existing BUA that will be removed(sq ft 17389 sf sf sf
18 Percent BUA 39% 74% 3%
19 Design storm inches 1.0 in
20 Design volume of SCM cu ft 3264 cf
21 Calculation method for design volume SHULER
ADDITIONAL INFORMATION
Please use this space to provide any additional information about the
22 drainage area(s):
Entire Site/SCM parking BUA differ by 1,690 sq.ft.which is the portion of
driveway stem that cannot be routed to SCM due to topographic limitations.
We are requesting a variance for this portion as it does not meet low
density threshold. There is also 885 sq.ft.of offsite drainage that cannot be
he p

LOW DENSITY
DESIGN REQUIREMENTS FOR LOW DENSITY PROJECTS FROM 02H.1003
1 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)
5 Maximum velocity in the vegetated conveyances during the 10-year storm?
6 Are curb outlet swales proposed?
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?
12 Is stormwater released at the edge of the setback as dispersed flow? Yes
13 1 Have stormwater outlets been designed to prevent downslope erosion? Yes
14 JAre variations to rule.1003 proposed? No
ADDITIONAL INFORMATION
15 1piease use this space to provide any additional information about this low density project:
Small portion of BUA in the driveway stem that cannot be routed to .V
SCM.
Swale BUA
Drainage Pervious Q Slope V,,,a,,, , Flow depth
# Area (ac) area C (cfs)acac (%) (fps) (fps) (ft)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30

SAND FILTER
11 Drainage area number 1
21 Minimum required treatment volume cu ft 2648 sf
GENERAL MDC FROM 02H.1050
3 Is the SCM sized to treat the SW from all surfaces at build-out? YFes
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
No
engineered side slopes?
7 Are the inlets,outlets,and receiving stream protected from erosion Yes
10- ear storm)?
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
13 If the SCM is on a single family lot,does(will?)the plat comply with 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
161 Does the SCM follow the device specific MDC? Yes
17 Was the SCM designed by an NC licensed rofessional? Yes
SAND FILTER MDC FROM 02H.1056
18 SHWT elevation(fmsl) 794
19 Type of sand filter(open or closed) Open
20 If closed,will the filter will be pre-cast or pour-in-place?
21 If closed,top of grate elevation(fmsl)
22 Is this sand filter designed to attenuate peak flows? No
Sediment Chamber
23 Volume that can be retained in the sediment chamber(cubic feet) 1632 cf
24 Will there be a permanent pool in the sediment chamber? Yes
25 Bottom of the sediment chamber(fmsl) 804.00
26 Area of the sediment chamber(square feet) 1270 sf
27 Physical depth of the sediment chamber(inches) 26.2 in
28 Ponding depth in the sediment chamber,above any permanent 13.2 in
pool(inches)
29 Elevation of top of weir between chambers(fmsl) 806.1
Sand Chamber
30 Volume that can be retained in the sand chamber(cubic feet) 1632 cf
31 JlBottom of the sand chamber(fmsl) 805.00
32 Area of the sand chamber(square feet) 1270 sf
331 Physical depth of the sand chamber(inches) 13.2 in
34 Ponding depth in the sand chamber,above the sand surface 13.2 in
(inches)
351 Elevation of the bypass device(fmsl) 806.1
36 Type of bypass device WEIR
37 Mechanism for distributing flow over the sand surface LEVEL
SPREADER
38 Sand specification for sand chamber ASTM C33
39 Depth above underdrain pipe(inches) 14 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 WiII clean-out pipes be capped? Yes
ADDITIONAL INFORMATION
43 Please use this space to provide any additional information about
the sand filter(s):
Sand Filter 4 12:01 PM 12/15/2023