SW6220902_Supplement-EZ Form_20221102

SUPPLEMENT-EZ COVER PAGE
FORMS LOADED
PROJECT INFORMATION
1 lProiectName
Project Area (ac)
Coastal Wetland Area (ac)
Surface Water Area (ac)
Is this project High or Low Density?
Does this protect use an off -site SCM?
Wook Lake II Phase II
35.9
0
0.67
Low
No
COMPLIANCE WITH 02H .1003(4)
7
Width of ve etated 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 ?
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
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
Ba filter
IFilterra
26
FORMS LOADED
NER CERTIFICATION
Name and Title:
Organization:
Street address:
City, State, Zip:
Phone number(s):
Email:
C. Scott Brown, PE
4D Site Solutions Inc.
409 Chicago Dr. Ste. 112
Raeford, NC 28376
910-426-6777
rrown(&4dsitesolutions.com
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.
Seal
Signature of Designer
Date

DRAINAGE AREAS
1
Is this a high density project?
No
2
If so, number of drainage areas/SCMs
0
3
Does this oroiect have low densit areas?
yes
4
If so number of low densit drainage areas
1
5
Is all/part of this project subject to previous rule
versions?
No
FORMS LOADED
DRAINAGE AREA INFORMATION
Entire Site
LID 1
4
Type of SCM
5
Total drainage area (sq ft
1534618
6
Onsite drainage area (sq ft
1534618
7
Offsite drainage area (sq ft
0
8
Total BUA in project (sq ft
368308 sf
9permitting)
New BUA on subdivided lots (subject to
s ft
211335 sf
10
New BUA not on subdivided lots (subject to
permitting) (sf)
156973 sf
11
Offsite BUA (sq ft
sf
12
Breakdown of new BUA not on subdivided lots:
- Parking (sq ft
- Sidewalk (sq ft
23120 sf
- Roof (sq ft
- Roadway s ft
133853 sf
- Future (sq 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
lExistina BUA that is already permitted (sq ft
17
Existing BUA that will be removed (sq ft
2472 sf
18
Percent BUA
24 0
19
IDesign storm inches
20
IDesign volume of SCM cu ft
21 lCalculation method for design volume
ADDITIONAL INFORMATION
Please use this space to provide any additional information about the
22 drainage area(s):

LOW DENSITY
DESIGN
REQUIREMENTS FOR LOW DENSITY PROJECTS FROM 021-1 .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)
3 sf
5
1 Maximum velocity in the vegetated conveyances during the 10-year storm?
5
6
JAre curb outlet swales proposed?
Yes
7
Maximum longitudinal slope of curb outlet swale(s) (% )
14
8
Bottom width of curb outlet swale(s) (feet)
2 It
9
Maximum side slope of curb outlet swale(s) (H:V)
3:1
10
Minimum length of curb outlet swale(s) (feet)
110 ft
11
Are treatment swales used instead of curb outlet swales?
No
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?
Yes
ADDITIONAL INFORMATION
15 JPlease use this space to provide any additional information about this low density project:
Some of the swales on the site are outside of normal parameters. They are all to be constructed with a liner and have
dissipaters at their outlets. Calculations for each ditch showing their stability and safety factor have been included with the
submittal.

1632 Wood Lake II Phase II Low Density Ditch Data
Designator
DA
Imp Ar
Grass Ar
C
Q
SLOPE
Vallow
Vactual
F Depth
SLOPE
BOTTOM
LINER
110YR
Ditch #1
1.58
5275
57549
0.48
5.98
2.98%
5.00
1.75
0.79
3:1
2
None
7.88
Ditch #2
6.20
15735
254337
0.43
23.62
0.60%
5.00
2.80
1.38
3:1
2
SC150
8.86
Ditch #3
1.11
3367
44984
0.44
3.84
5.56%
5.00
3.00
0.40
3:1
2
SC150
7.88
Ditch #4
1.39
11327
49221
0.45
4.93
7.19%
5.00
2.32
0.57
3:1
2
P300
7.88
Ditch #5
0.97
12078
30175
0.70
5.35
3.32%
5.00
2.77
0.54
3:1
2
SC150
7.88
Ditch #6
1.19
21328
30508
0.55
5.16
14.92%
5.00
5.48
0.32
3:1
2
P300
7.88
Ditch #7
5.86
78408
176853
0.50
22.97
3.43%
5.00
3.64
1.14
3:1
2
P300
7.88
Ditch #8
2.74
36150
83135
0.50
10.80
12.30%
5.00
4.74
0.65
3:1
2
SC250
7.88
Ditch #9
0.70
18829
11663
0.70
3.86
2.55%
5.00
2.29
0.56
3:1
2
5150
7.88
Ditch #10
1.91
18000
65199
0.40
6.02
3.00%
5.00
2.00
0.64
3:1
2
S150
7.88
Ditch #11
1.59
11456
57804
0.50
6.26
8.98%
5.00
7.21
0.28
3:1
2
P300
7.88