SW6220203_Supplement-EZ Form_20220505

SUPPLEMENT-EZ COVER PAGE
FORMS LDADED
PROJECT INFORMATION
1
Project Name
Pro ect Area (ac)
Dollar General - Raeford (Hoke County)
2
2.84
3
Coastal Wetland Area ac
4
Surface Water Area (ac).
High
No
5
Is this project High or Low Density?
6
Does this project use an off -site SCM?
COMPLIANCE WITH 02H .1003(4)
7
Width of vegetated setbacks provided feet
8
Will the vegetated setback remain vegetated?
NIA
9
If BUA ispro osed in the setback . does it meet NCAC 02H.1003 4 o-d !?
No
10
Is streambank stabilization proposed on this project?
No
NUMBER AND TYPE OF SCMs:
11
Infiltration System
1
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
0
18
Green Roof
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
FORMS LOADED
DESIGNER CERTIFICATION
27 Name and Title: Matt Lowder, PE
28 Or anization: Bowman North Carolina. Ltd.
29 1 Street address: 4006 Barrett Dr. Suite 104
Phone
Email:
Raleigh, NC 27609
919-553-6570
[e-mail]
Certification Statement:
I certify, under penatty of law that this Supplement-FZ 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.
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Signature & Designer
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DRAINAGE AREAS
1
Is this a high density pro ect?
Yes
2
If so, number of drainage areas/SCMs
1
3
Does this pro ect have low density areas?
No
4
If so, number of low density drainage areas
0
5
Is all/part of this project subject to previous rule
versions?
No
FORMS LOADED
DRAINAGE AREA INFORMATION
Entire Site
1
4
Type of SCM
Infiltration Basin
5
Total drainage area (sq ft
142297
93972
6
Onsite drainage area (sq ft
123745
75420
7
Offsite drainage area (sq ft
18552
18552
8
Total BUA in pro ect (sq ft
58416 sf
58211 sf
9
New BUA on subdivided lots (subject to permitting)
(sq ft
10
New BUA not on subdivided lots (subject to
rmittin sf
11
Offsite BUA (sq ft
15492 sf
15492 sf
12
Breakdown of new BUA not on subdivided lots:
Parking (sq ft
29892 sf
29892 sf
Sidewalk (sq ft
2392 sf
2187 sf
Roof (sq ft
10640 sf
10640 sf
Roadway s ft
Future (so ft
Other, please specify in the comment box below
(sq ft
13
New infiltrating permeable pavement on subdivided
lots (sq ft
14
New infiltrating permeable pavement not on
subdivided lots (sq ft
15permitting)
Existing BUA that will remain (not subject to
s ft
16
Existing BUA that is already permitted (sq ft
17
Existing BUA that will be removed (sq ft
18
Percent BUA
35 %
62
19
Design storm inches
1.0 in
20
Design volume of SCM cu ft
4763 cf
21
Calculation method for design volume
Simple Method
ADDITIONAL INFORMATION
22
1 Please use this space to provide any additional information about the
drainage area(s):

INFILTRATION SYSTEM
1
5
What are the side slopes of the SCM (H:V or enter "Vertical' for
trenches)?
3:1
6
Does the SCM have retaining walls, gabion walls or other engineered
side slopes?
No
7
Are the inlets, outlets, and receiving stream protected from erosion
(10-yearstorm)?
Yes
8
Is there an overflow or bypass for inflow volume in excess of the
design volume?
Yes
ri-90
What is the method for dewatering the SCM for maintenance?
Pump (preferred)If
applicable, will the SCM be cleaned out after construction?
Yes
13
If the SCM is on a single family lot, does (will?) the plat comply with
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 licensedprofessional?
Yes
18
jProposed slope of the subgrade surface (%)
0
19
jAre terraces or baffles provided?
No
20
IType of pretreatment:
Forebay
ILr M.nn
21
Was the soil investigated in the footprint and at the elevation of the
infiltrations stem?
Yes
22
SH Wi elevation (fmsl)
369.90
23
Depth to SHWi per soils report (in)
12120
24
Ground elevation at boring in soils report (fmsl)
380.00
25
Is a detailed hydrogeologic study attached if the separation is
between 1 and 2 feet?
N/A
26
Soil infiltration rate (in/hr)
5.00
27
1 Factor of safety (FS) (2 is recommended):
2.00
1 F1—ftnnc
29
113ottomelevation (fmsl)
374.8 It
30
IStorage elevation (fmsl)
377. It
31
1 Bypass elevation (fmsl)
3802 It
For Basins Only
32 1 Bottom surface area(ft) 1590 ft
33 IStorage elevation surface area(ft) 3385. It
Fni Tmnrha nnly
34
Length (ft)
35
Width (ft)
36
Perforated pipe diameter, if applicable (inches)
37
Number of laterals
38
Total length of perforated piping
39
Stone type, if applicable
40
Stone porosity (%)
L.4
Is stone free of fines?
42
Is the stone wrapped in geotextile fabric?
43
Has at least one inspection port been provided?
Volumes/Drawdown
44 IDesign volume of SCM (cu ft)
45 ITime to draw down (hours)
ADDITIONAL INFORMATION
Please use this space to provide any
The geotechnical report performed on our site recorded a infiltration rate of 11.3
inches per hour. For our design, we chose to use a more conservate rate of 5.0
inches per hour, line 26.
Infiltration 1 2:55 PM 5/5/2022