SW6240608_Supplement-EZ Form_20240625

SUPPLEMENT-EZ COVER PAGE
FORMS LOADED
PROJECT INFORMATION
1 Project Name Caropines Phases 3A/7A
2 Project Area ac) _ 15.81
3 Coastal Wetland Area(ac) �v-
4 Surface Water Area(ac) -
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) 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)? No
10 Is streambank stabilization proposed on this project? No
NUMBER AND TYPE OF SCMs:
11 Infiltration System I 2
12 Bioretention Cell _ 0
13 Wet Pond _ 1
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 1Treatment Swale 0
22 D Pond 0
23 StormFilter _ 0
24 Silva Cell 0
25 Bayfilter 0
26 Filterra 0
FORMS LOADED 1
DESIGNER CERTIFICATION
27 Name and Title: Matt Lowder,PE
28 _Organization: Bowman North Carolina,Ltd.
29 Street address: 4006 Barrett Drive,Suite 104
30 ;City,State,Zip: Raleigh,NC 27609 _
31 Phone number(s): 919-553-6570
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
Signature of Designer
SEAL
051571
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//�icp'rti0„E, ��o\ Date

DRAINAGE AREAS
1 Is this a high density project? Yes
2 If so,number of drainage areas/SCMs 3
~3 :Does this project have low density areas? Nov
4 If so,number of low density drainage areas 0
Is all/part of this project subject to previous rule
5 versions? No
FORMS LOADED
T2-----p-- 3
DRAINAGE ofA SCMEA INFORMATION Entire Site Infiltration Basin Infiltration Basinet
�-- Type • Pond
5 Total drainage area(sq ft) 952186 sf 95450 _&. 101415 755321
6 Onsite drainage area(sq ft) 952186 sf L 95450 101415 755321
7 Offsite drainage area(sq ft) sf
8 Total BUA in project(sq ft) 256050 sf 22955 sf _ 39164 sf 193931 sf
,New BUA on subdivided lots(subject to permitting)
9 (sq ft)
New BUA not on subdivided lots(subject to
410 ,permitting)(sf)
11 Offsite BUA(sq ft) sf
12 Breakdown of new BUA not on subdivided lots:
4
-Parking(sq ft) _-Sidewalk(sq ft) 17882 sf 2975 sf 2689 sf 12218 sf
-Roof(sq ft) 146520 sf 19980 sf 23310 sf 103230 sf
-Roadway(sq ft) 91648 sf 13165 sf 78483 sf
-Future(sq ft)
-Other,please specify in the comment box
below(sq ft) _
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 24% 39% 26%
19 Design storm(inches) 1.0 in _ 1.0 in _ 1.0 in
`.20 Design volume of SCM(cu ft) _ 2119 cf t 3360 cf � . 17692 cf
21 Calculation method for design volume Simple Method Simple Method Simple Method
ADDITIONAL INFORMATION
Please use this space to provide any additional information about the
22 drainage area(s):

INFILTRATION SYSTEM
1 Drainage area number 1 2
2 Minimum required treatment volume(cu ft) 2119 cf 1 3360 cf
:GENERAL MDC FROM 02H.1050
mom-
3 Is the SCM sized to treat the SW from all surfaces at build-out? Yes Yes
4 Is the SCM located away from contaminated soils? Yes Yes
5 What are the side slopes of the SCM(H:V or enter"Vertical"for
trenches)? 3:1 3:1
6 Does the SCM have retaining walls,gabion walls or other engineered
side slopes? No No
7 Are the inlets,outlets,and receiving stream protected from erosion
(10-year storm)? Yes Yes
8 Is there an overflow or bypass for inflow volume in excess of the
design volume? i Yes Yes
- 9 What is the method for dewatering the SCM for maintenance? ` Pump(preferred) Pump(preferred)
10 If applicable,will the SCM be cleaned out after construction? Yes Yes j
i __
11 Does the maintenance access comply with General MDC(8)? Yes Yes
- 12 Does the drainage easement comply with General MDC(9)? Yes Yes
13 If the SCM is on a single family lot,does(will?)the plat comply with
General MDC(10)? N/A N/A
14 Is there an O&M Agreement that complies with General MDC(11)? Yes Yes
15 Is there an O&M Plan that complies with General MDC(12)? Yes _ Yes
16 I Does the SCM follow the device specific MDC? Yes Yes
17 Was the SCM designed by an NC licensed professional? Yes Yes
INFILTRATION SYSTEM MDC FROM 02H.1051
18 Proposed slope of the subgrade surface(%) { 0% 0%
19 Are terraces or baffles provided? , No No
-
l_20 Type of pretreatment: f Forebay Forebay
Soils Data
21 Was the soil investigated in the footprint and at the elevation of the
infiltration system? Yes _ Yes
22 SHWT elevation(fmsl) 379.00 _ 368.10 _
23 Depth to SHWT per soils report(in) 120.00 22.00 _
24 Ground elevation at boring in soils report(fmsl) 389.00 370.00
25 Is a detailed hydrogeologic study attached if the separation is
between 1 and 2 feet? Yes Yes
26 Soil infiltration rate(in/hr) 12.00 10.50
27 Factor of safety(FS) (2 is recommended): 2.00 2.00
Elevations
29 Bottom elevation(fmsl) 381 ft 374 ft
30 Storage elevation(fmsl) 383.ft 375.ft
31 ;Bypass elevation(fmsl) I 383.4 ft 375.75 ft
For Basins Only
32 Bottom surface area(ft2) 1580 ft I 2845 ft
33 Storage elevation surface area() 2695.ft -- 4250.ft
For Trenches Only
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(%)
41 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 Design volume of SCM(cu ft) 2119 cf I 3360 cf
45 Time to draw down(hours) 72 hrs 72 hrs
ADDITIONAL INFORMATION
46 Please use this space to provide any additional information about the
infiltration system(s):
Infiltration 1 8:40 AM 5/29/2024