SW6221101_Supplement-EZ Form_20221129

SUPPLEMENT-EZ COVER PAGE
FORMS LOADED
PROJECT INFORMATION
1 jProject Name
2 1Proiect Area (ac)
Surface Water Area (ac)
Is this project High or Low Density?
Does this Proiect use an off -site SCM?
Fort BraggTechnical Support Annex, PN79439.2
17.17
0
0
High
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 ?
N/A
10
Is streambank stabilization proposed on this project?
No
NUMBER AND TYPE OF SCMs:
11
Infiltration System
0
12
Bioretention Cell
3
13
Wet Pond
0
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
Treatment Swale
0
22
Dry Pond
1
23
StormFilter
0
24
Silva Cell
0
25
Ba filter
0
26
Filterra
0
FORMS LOADED
DESIGNER CERTIFICATION
27
Name and Title:
Lorraine Roberts, PE - Civil Engineer
28
Organization:
Exp Federal Inc.
29
Street address:
205 N. Michigan Ave., Suite 3800
30
City, State, Zip:
Chicago, IL 60601
31
Phone numbers :
312-616-3309
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.
SS�o SEAL
EN `INFER
4�iyE B. Ro��
Signature of Designer
11 /16/2022
Date

DRAINAGE AREAS
1
Is this a high density project?
Yes
2
If so, number of drainage areas/SCMs
4
3
Does this project 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
2
3
4
4
Type of SCM
-
Dry Pond
Bioretention
Bioretention
Bioretention
5
Total drainage area (sq ft
747925.2
409464
43560
34848
47916
6
Onsite drainage area (sq ft
621165.6
409464
43560
34848
47916
7
Offsite drainage area (sq ft
126759.6
0
0
0
0
8
Total BUA in project (sq ft
357628 sf
226512 sf
32670 sf
28314 sf
37026 sf
9
New BUA on subdivided lots (subject to
ermitting) (sq ft
N/A
N/A
N/A
N/A
N/A
10permitting)
New BUA not on subdivided lots (subject to
s
298386 sf
226512 sf
32670 sf
28314 sf
37026 sf
11
Offsite BUA (sq ft
59242 sf
N/A
N/A
N/A
N/A
12
Breakdown of new BUA not on subdivided lots:
Parkina (sq ft
Sidewalk (sq ft
-
-
-
-
-
54014 sf
23958 sf
10019 sf
10019 sf
10019 sf
-
-
-
-
-
Roof (sq ft
40511 sf
40511 sf
Roadway s ft
26136 sf
26136 sf
Future (sq ft
-
-
Other, please specify in the comment box
below (sq ft
118483 sf
13
New infiltrating permeable pavement on
subdivided lots (sq ft
N/A
N/A
N/A
N/A
N/A
14
New infiltrating permeable pavement not on
subdivided lots (sq ft
N/A
N/A
N/A
N/A
N/A
15permitting)
Existing BUA that will remain (not subject to
s ft
N/A
N/A
N/A
N/A
N/A
16
Existing BUA that is already permitted (sq ft
N/A
N/A
N/A
N/A
N/A
17
Existing BUA that will be removed (sq ft
N/A
N/A
N/A
N/A
N/A
18
Percent BUA
48%
55%
75%
81 %
77%
19
Design storm inches
1.0 in
1.0 in
1.0 in
1.0 in
1.0 in
20
Design volume of SCM cu ft
29938 cf
16625 cf
2632 cf
2269 cf
2977 cf
21
Calculation method for design volume
Simple Method
Simple Method
Simple Method
Simple Method
Simple Method
DDITIONAL INFORMATION
22
Please use this space to provide any additional information about the
drainage area(s):
-Difference in the entire site design volume and design volume for each SCM
is provided for by excess volume in the bioretention facilities.
-Other BUA not on subdivided lots consists of concrete pads, storage and
other ancillary impervious surfaces required for the project.

BIORETENTION CELL
1
1Drainage area number
B3
B4
B5
2
IMinimumre uired treatment volume cu ft
2632 cf
2269 cf
2977 cf
GENERAL MDC FROM 02H .1050
3
Is the SCM sized to treat the SW from all surfaces at build -out?
Yes
Yes
Yes
4
Is the SCM located away from contaminated soils?
Yes
Yes
Yes
5
What are the side slopes of the SCM (H:V)?
3:1
3:1
3:1
6
Does the SCM have retaining walls, gabion walls or other
engineered side slopes? _
Are the inlets, outlets, and receiving stream protected from erosion
(10-year storm)?
No
No
No
7
Yes
Yes
Yes
8
Is there an overflow or bypass for inflow volume in excess of the
design volume?
Yes
Yes
Yes
9
What is the method for dewatering the SCM for maintenance?
Pump (preferred)
Pump (preferred)
Pump (preferred)
10
If applicable, will the SCM be cleaned out after construction?
Yes
Yes
Yes
11
Does the maintenance access comply with General MDC (8)?
Yes
Yes
Yes
12
Does the drainage easement comply with General MDC (9)?
Yes
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
N/A
14
Is there an O&M Agreement that complies with General MDC (11)?
Yes
Yes
Yes
15
Is there an O&M Plan that complies with General MDC (12)?
Yes
Yes
Yes
16
Does the SCM follow the device specific MDC?
Yes
Yes
Yes
17
Was the SCM designed by an NC licensed professional?
Yes
Yes
Yes
BIORETENTION
CELL MDC FROM 02H .1052
18
SHWT elevation (fmsl)
N/A
N/A
N/A
19
Bottom of the bioretention cell (fmsl)
267.00
267.00
268.00
20
Ponding depth of the design storm (inches)
12 in
12 in
12 in
21
Surface area of the bioretention cell (square feet)
7420 sf
7420 sf
7420 sf
22
Design volume of SCM (cu ft)
6678 cf
6678 cf
6678 cf
23
Is the bioretention cell used for peak attenuation?
No
No
No
24
Depth of peak attenuation over planting surface (in)
N/A
N/A
N/A
25
Height of peak attenuation outlet above the planting surface (in)
N/A
N/A
N/A
26
Infiltration rate of the in situ soil (inch/hour)
1 in/hr
1 in/hr
1 in/hr
27
Diameter of the underdrain pipes (if applicable)
4 in
4 in
4 in
28
Does the design include Internal Water Storage (IWS)?
Yes
Yes
Yes
29
if so, elevation of the top of the IWS (fmsl)
265.5
265.5
266.5
30
Elevation of the planting surface (fmsl)
267
267
267
31
What type of vegetation will be planted? (grass, trees/shrubs,
other)?
Grass
Grass
Grass
32
Media depth (inches)
24 in
24 in
24 in
33
Percentage of medium to coarse washed sand by volume
85%
85%
85%
34
Percentage of fines (silt and clay) by volume
10%
10%
10%
35
Percentage of organic matter by volume
5%
5%
5%
36
Type of organic material
Pine bark fines
Pine bark fines
Pine bark fines
37
Phosphorus Index (P-Index) of media (unitless)
10
10
10
38
Will compaction be avoided during construction?
Yes
Yes
Yes
39
Will cell be maintained to a one inch/hour standard?
Yes
Yes
Yes
40
Depth of mulch, if applicable (inches)
N/A
N/A
N/A
41
IType of mulch, if applicable
N/A
N/A
N/A
42
1 How many clean out pipes are being installed?
2
2
2
43
IType of pretreatment that will be used:
Grass/gravel
Grass/gravel
Grass/gravel
ADDITIONAL INFORMATION
Please use this space to provide any additional information about
44 Ithe bioretention cell(s):
-SHWT in excess of 25-feet during conducted soil borings.
Bioretention 3 2:07 PM 11/16/2022

DRY POND
11
Drainage area number
A
21
Minimum required treatment volume cu ft
16625 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)?
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- ear 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?
Other
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 ?
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 desi ned by an NC licensedprofessional?
Yes
DRY POND MDC FROM 02H .1062
18
SHWT elevation (fmsl)
N/A
19
Elevation of the bottom of the dry pond (fmsl)
254
20
Distance from bottom to SHWT feet
N/A
21
Elevation of the temporary pool during the design storm (feet)
256 ft
22
Ponding depth of the design storm feet
2 ft
23
Will the dry pond be uniformly graded to flow toward the outlet?
Yes
24
Is a low flow channel being provided?
No
25
Are the inlet(s) and outlet located in a manner that avoids short-
c rcuitin ?
Yes
26
Will berms or baffles be provided to increase the flowpath?
No
27
What method of pretreatment will be provided?
Forebay
28
Design volume of SCM cu ft
16625
29
Diameter of drawdown orifice (in)
N/A
30
Drawdown time for the temporary pool hours
2.25
31
Does the pond minimize impacts to the receiving channel from the
1- r,24-hrstorm?
Yes
32
Is there a small permanent pool near the orifice to prevent
clo in ?
Will the outlet be designed to prevent clogging?
Are the dam and embankment planted in non -clumping turf grass?
Yes
33
Yes
34
Yes
35
Species of turf that will be used on the dam and embankment
See plans.
36
Will trees and shrubs be prevented from growing on the dam and
embankment?
Yes
ADDITIONAL INFORMATION
37 Please use this space to provide any additional information about
the dry pond(s):
-Skimmer device to be utilized for SCM drawdown.
-SHWT in excess of 25-feet during conducted soil borings.
-Low-flow channel not being provided due to the presence of underdrains
in the dry pond.
-Underdrains utilized in lieu of drawdown orifice. Orifice holes utilized to
control storm events beyond that of the design storm.
Dry Pond 4 2:09 PM 11/16/2022