SW4240901_Supplement-EZ Form_20241106

SUPPLEMENT-EZ COVER PAGE
FORMS LOADED
INFORMATION
1 Project Name Mitchell's Gorge
2 Project Area(ac) 21.84
3 Coastal Wetland Area(ac) n/a
4 Surface Water Area(ac) 0.152
5 Is this project High or Low Density? Low
6 Does this project use an off-site SCM? No
COMPLIANCE WITH 02H.1003(4)
7 'Width of vegetated setbacks provided(feet) 50
8 JWill the vegetated setback remain vegetated? Yes
9 If BUA is proposed in the setback,does it meet NCAC 02H.1003(4)(c-d)? NIA
10 I 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
17 Rainwater Harvesting(RWH)
18 Green Roof
19 Level Spreader-Filter Strip(LS-FS)
20 Disconnected Impervious Surface(DIS)
21 Treatment Swale
22 JDry Pond
23 StormFilter
24 Silva Cell
25 Bayfilter
26 Filterra
FORMS LOADED
WhSIGNER CERTIFICATION
27 Name_and Title: Michael Lash,PE.
28 Organization: N � Lash Engineering,Inc.t
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29 Street address: F 1104 Cindy Carr Drive
30 City,State,Zip: Matthews,NC, 28105
31 JPhone number(s): 704-847-3031
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
gnature of Designer
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Seal Date/

DRAINAGE AREAS
1 Is this a high density project? No
2 If so,number of drainage areas/SCMs 0
3 Does this project 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 LD 1
4 Type of SCM Low Density
5 Total drainage area(sq ft) 951,383 951,383
6 Onsite drainage area(sq ft) 951,383
7 Offsite drainage area(sq ft) 0
8 Total BUA in project(sq ft) 113369 sf
New BUA on subdivided lots(subject to
9 permitting)(sq ft) 79205 sf
New BUA not on subdivided lots(subject to
10 permitting)(sf) 34164 sf
11 Offsite BUA(sq ft)
12 Breakdown of new BUA not on subdivided lots:
Parking(sq ft)
Sidewalk(sq ft)
Roof(sq ft)
Roadway(sq ft) 34164 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 Isubdivided 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 <12%
19 Design storm(inches)
20 Design volume of SCM(cu ft)
21 Calculation method for design volume
ADDITIONAL INFORMATION
Please use this space to provide any additional information about the
22 drainage area(s):
Site uses dispersed flow through vegetated natural undisturbed areas.
Currently(8-18-24)6 lots remain that have pads installed,but does not
have the houses constructed. In order to stay less than 12%for the
property,the total impervious area should not exceed 11,363 sf.or each

LOW DENSITY
DESIGN REQUIREMENTS FOR LOW DENSITY PROJECTS FROM 02H.1003
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? No
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 Have stormwater outlets been designed to prevent downslope erosion? Yes
14 Are variations to rule.1003 proposed? No
ADDITIONAL INFORMATION
15 1piease use this space to provide any additional information about this low density project:
The paved access road has no curb&gutter.Stormwater is dispersed to the grassed areas via the slope of the crown.The hous
downspouts are piped to the bottom of the slopes.The areas around the RV pads are natural,grasses&woods,undisturbed,an
away from the development.There are no swales,the stormwater is dispersed.
Drainage Pervious
Swale BUA Q Slope V,naw V"m,i Flow depth
# Area (ae) area C (efs) N (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
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25
26
27
28

zs
30