SW3240802_Supplement-EZ Form_20241108

SUPPLEMENT-EZ COVER PAGE
FORMS LOADED
PROJECT INFORMATION
1 Project Name Luna Estates Subdivision
2 Project Area(ac) 28.96
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) 30
8 Will the vegetated setback remain vegetated? Yes
9 If BUA is proposed in the setback,does it meet NCAC 02H.1003(4)(c-d)? Yes
10 Is streambank stabilization proposed on this project? No
NUMBER AND TYPE OF SCMs:
11 Infiltration System 1
12 Bioretention Cell
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: Zachary Gase,Project Engineer
28 Organization: McKim&Creed
29 Street address: 8020 Tower Point Drive
30 City,State,Zip: Charlotte,NC 28227
31 Phone number(s): 704-841-2588
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
FORMS LOADED
DRAINAGE AREA INFORMATION Entire Site 1
4 Type of SCM Infiltration Basin
5 Total drainage area(sq ft) 1054316
6 Onsite drainage area(sq ft) 1054316
7 Offsite drainage area(sq ft) 0
8 Total BUA in project(sq ft) 203433 sf 203433 sf
New BUA on subdivided lots(subject to
9 permitting)(sq ft) 110006 sf 110006 sf
New BUA not on subdivided lots(subject to
10 permitting)(sf) 93427 sf 93427 sf
11 Offsite BUA(sq ft) - -
12 Breakdown of new BUA not on subdivided lots:
-Parking(sq ft) --Sidewalk(sq ft) 13283 sf 13283 sf
-Roof(sgft) --Roadway(sq ft) 80144 sf 80144 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 19% 19%
19 Design storm(inches) N/A N/A
20 Design volume of SCM(cu ft) 40155 cf
21 Calculation method for design volume SA/DA Method
ADDITIONAL INFORMATION
Please use this space to provide any additional information about the
22 drainage area(s):
Design volumes listed above are the PROVIDED design volumes,not
minimum required design volumes.
Design storm is determined,via HydroCAD,as difference between pre.vs.
post runoff volume for the 1-yr,24-hr storm per Goose Creek rules.

INFILTRATION SYSTEM
1 Drainage area number 1 I
2 Minimum required treatment volume(Cu ft) 37690 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 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-year storm)? Yes _
8 Is there an overflow or bypass for inflow volume in excess of the
design volume? Yes
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
General MDC(10)? Yes
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
INFILTRATION SYSTEM MDC FROM 02H.1051
18 Proposed slope of the subgrade surface(%) 0%
19 Are terraces or baffles provided? No
20 Type of pretreatment: Other
Soils Data
21 Was the soil investigated in the footprint and at the elevation of the
infiltration system? Yes
22 SHWT elevation(fmsl) N/A
23 Depth to SHWT per soils report(in) N/A _
24 Ground elevation at boring in soils report(fmsl) 694.00
25 Is a detailed hydrogeologic study attached if the separation is
between 1 and 2 feet? Yes
26 Soil infiltration rate(in/hr) 0.31
27 Factor of safety(FS) (2 is recommended): 2.00
Elevations
29 Bottom elevation(fmsl) 697.5 ft
30 Storage elevation(fmsl) 698.5 ft
31 Bypass elevation(fmsl) 698.5 ft
For Basins Only
32 Bottom surface area(ft2) 39543 ft I
33 Storage elevation surface area(ft2) 41841.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) 40646 cf
45 Time to draw down hours 72 hrs
ADDITIONAL INFORMATION
46 Please use this space to provide any additional information about
the infiltration system(s):
A combination of forbay and swale will be used for the pre treatment
Seasonal high water table was determined to be greater than 2 ft below the bottom
of the infiltration basin due to the fact it was not discovered within the boring depth
Infiltration 3 10:29 AM 11/8/2024