SW6110103_Supplement-EZ Form_20221220

SUPPLEMENT-EZ COVER PAGE
FORMS LOADED
OJECT
INFORMATIOhff
Project Name
Project Area ac
1
JSOC - MICROGRID INSTALLATION AND INTEGRATION
2
3.10
3
Coastal Wetland Area (ac)
0
0
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 02
7
Width of vegetated setbacks provided (feet)
0
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
MBER A E OF SCMs:
11
Infiltration System
1
12
Bioretention Cell
1
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:
Brian D. Fisher
28
Organization:
AECOM
29
Street address:
10 S. Jefferson, Suite 1600
30
City, State, Zip:
Roanoke, VA 24011
31
Phone numbers :
540-857-3226
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.
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DRAINAGE AREAS
1
Is this a hi h density project?
Yes
2
If so, number of drainage areas/SCMs
2
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
4
Type of SCM
Varies
Infiltration Trench
Bioretention
5
Total drainage area (sq ft
111,654 sf
85,000 sf
26,654 sf
6
Onsite drainage area (sq ft)
103,923 sf
80,275 sf
23,648 sf
7
Offsite drainage area (sq ft
7,731 sf
4,725 sf
3,006 sf
8
Total BUA in project (sq ft
72,558 sf
60,221 sf
12,337 sf
9
New BUA on subdivided lots (subject to permitting)
(sq ft
10
New BUA not on subdivided lots (subject to
permitting) (so
14,158 sf
1,821 sf
12,337 sf
11
Offsite BUA (sq ft)
2,120 sf
1,650 sf
470 sf
12
Breakdown of new BUA not on subdivided lots:
Parking (sq ft
24,850 sf
24,850 sf
Sidewalk (sq ft
5,050 sf
5,050 sf
Roof (sq ft
23,400 sf
23,400 sf
Roadway (sq ft)
Future (sq ft
Other, please specify in the comment box
below (sq ft)
18,631 sf
5,271 sf
13,360 sf
13
New infiltrating permeable pavement on
subdivided lots (sq ft
14
New infiltrating permeable pavement not on
Isubdivided lots (sq ft
Existing BUA that will remain (not subject to
s ft
15permitting)
16
Existing BUA that is already permitted (sq ft)
58,400 sf
58,400 sf
17
Existing BUA that will be removed (sq ft
1,023 sf
1,023 sf
18
Percent BUA
65%
71%
46%
19
Design storm inches
1.0 in
1.0 in
1.0 in
20
Design volume of SCM cu ft
6,047 cf
5,018 cf
1,028 cf
21
Calculation method for design volume
Simple
Simple
Simple
ADDITIONAL INFORMATIO
22
Please use this space to provide any additional information about the
drainage area(s):
DA-1, previously permitted: 3,000 sf (other on -site); 450 sf (existing BUA); for permit
modification: 1,821 (new BUA)
DA-2: for permit modification: 13,360 (new BUA) - 1,023 (removed BUA) = 12,337 sf of
permit BUA (470 sf of this area goes offsite - not to the biortention SCM)

BIORETENTION CELL
1
Drainage area number
2
2
Minimum required treatment volume (cu ft)
1028 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?
Yes
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)?
N/A
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 designed by an NC licensed professional?
Yes
BIORETENTION
CELL MDC FROM 02H .1052
18
SHWT elevation (fmsl)
255.20
19
Bottom of the bioretention cell (fmsl)
260.00
20
Ponding depth of the design storm (inches)
12 in
21
Surface area of the bioretention cell (square feet)
1260 sf
22
Design volume of SCM (cu ft)
1525 cf
23
Is the bioretention cell used for peak attenuation?
Yes
24
Depth of peak attenuation over planting surface (in)
18 in
25
Height of peak attenuation outlet above the planting surface (in)
12 in
26
Infiltration rate of the in situ soil (inch/hour)
0.50 in/hr
27
Diameter of the underdrain pipes (if applicable)
6", 8"
28
Does the design include Internal Water Storage (IWS)?
Yes
29
if so, elevation of the top of the IWS (fmsl)
262.50
30
Elevation of the planting surface (fmsl)
264.00
31
What type of vegetation will be planted? (grass, trees/shrubs,
other)?
Grass
32
Media depth (inches)
30 in
33
Percentage of medium to coarse washed sand by volume
75%-85%
34
Percentage of fines (silt and clay) by volume
8%-15%
35
Percentage of organic matter by volume
5%-15%
36
Type of organic material
Engineered Fill
37
Phosphorus Index (P-Index) of media (unitless)
< 50
38
Will compaction be avoided during construction?
Yes
39
Will cell be maintained to a one inch/hour standard?
Yes
40
Depth of mulch, if applicable (inches)
N/A
41
Type of mulch, if applicable
N/A
42 How many clean out pipes are being installed?
43 Type of pretreatment that will be used: -71
ADDITIONAL INFORMATION
44 1 Please use this space to provide any additional information about the
bioretention cell(s):
3
Additional
Information
(1) pretreatment: containment tank and grass swale.
Bioretention 1 2:50 PM 10/10/2022

Permit Number:
(to be provided by DWQ)
A, *V',2A*AJ-L-
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STORMWATER MANAGEMENT PERMIT APPLICATION FORM
401 CERTIFICATION APPLICATION FORM
BIORETENTION CELL SUPPLEMENT
This form must be filled out, printed and submitted.
The Required Items Checklist (Part 111) must be printed, filled out and submitted along with all of the required information.
I. PROJECT INFORMATION
Project name
JSOC Microgrid Installation and Integration
Contact name
Brian Fisher
Phone number
540-857-3226
Date
September 28, 2022
Drainage area number
2
II. DESIGN INFORMATION
Site Characteristics
Drainage area
26,654 ftz
Impervious area
12,337 ftZ
Percent impervious
46.30/c
Design rainfall depth
1.0 inch
Peak Flow Calculations
Is pre/post control of the 1-yr, 24-hr peak flow required?
1-yr, 24-hr runoff depth
1-yr, 24-hr intensity
Pre -development 1-yr, 24-hr peak flow
Post -development 1-yr, 24-hr peak flow
Pre/Post 1-yr, 24-hr peak control
Storage Volume: Non -SA Waters
Minimum volume required
Volume provided
Storage Volume: SA Waters
1.5" runoff volume
Pre -development 1-yr, 24-hr runoff
Post -development 1-yr, 24-hr runoff
Minimum volume required
Volume provided
Cell Dimensions
Ponding depth of water
Ponding depth of water
Surface area of the top of the bioretention cell
Length:
Width:
-or- Radius
Media and Soils Summary
Drawdown time, ponded volume
Drawdown time, to 24 inches below surface
Drawdown time, total:
In -situ soil:
Soil permeability
Planting media soil:
Soil permeability
Soil composition
%Sand (by volume)
%Fines (by volume)
%Organic (by volume)
Phosphorus Index (P-Index) of media
Form SW401-Bioretention-Rev.8
June 25, 2010
3.07 in
in/hr
ft'/sec
ft'/sec
ft'/sec
1,028.0 ft'
1,525.0 ft' OK
ft3
3
ft3
"q.... "
0 ft3
ft3
s
2 :
12 inches
OK
-_
1.00 ft
1,260.0 ftZ
65 ft
OK
OK
.5 2
= r=
19 ft
OK
ftPrr....,
00
6 hr
OK
12 hr
OK
18 hr
0.52 in/hr
OK
1.00 in/hr
OK
85% OK
10% OK
5% OK
Total: 1000/c
30 (unitless) OK
Parts I and 11. Design Summary, Page 1 of 2

Permit Number:
(to be provided by DWQ)
Basin Elevations
Temporary pool elevation
Type of bioretention cell (answer "Y" to only one of the two
following questions):
Is this a grassed cell?
Is this a cell with trees/shrubs?
Planting elevation (top of the mulch or grass sod layer)
Depth of mulch
Bottom of the planting media soil
Planting media depth
Depth of washed sand below planting media soil
Are underdrains being installed?
How many clean out pipes are being installed?
What factor of safety is used for sizing the underdrains? (See
BMP Manual Section 12.3.6)
Additional distance between the bottom of the planting media and
the bottom of the cell to account for underdrains
Bottom of the cell required
SHWT elevation
Distance from bottom to SHWT
Internal Water Storage Zone (IWS)
Does the design include IWS
Elevation of the top of the upturned elbow
Separation of IWS and Surface
Planting Plan
Number of tree species
Number of shrub species
Number of herbaceous groundcover species
Additional Information
Does volume in excess of the design volume bypass the
bioretention cell?
Does volume in excess of the design volume flow evenly
distributed through a vegetated filter?
What is the length of the vegetated filter?
Does the design use a level spreader to evenly distribute flow?
Is the BMP located at least 30 feet from surface waters (50 feet if
SA waters)?
Is the BMP localed at least 100 feet from water supply wells?
Are the vegetated side slopes equal to or less than 3:1?
Is the BMP located in a proposed drainage easement with access
to a public Right of Way (ROW)?
Inlet velocity (from treatment system)
Is the area surrounding the cell likely to undergo development in
the future?
Are the slopes draining to the bioretention cell greater than 20%?
Is the drainage area permanently stabilized?
Pretreatment Used
(Indicate Type Used with an "X" in the shaded cell)
Gravel and grass
(8'inches gravel followed by 3-5 ft of grass)
Grassed swale
Forebay
Other
265.00 fmsl
Y (Y or N) OK
N (Y or N)
264 fmsl
inches
261.5 fmsl
2.5 ft
05ft
Y (Y or N)
3 OK
10 OK
1ft
260 fmsl
255.2 fmsl
4.8 ft OK
Y (Y or N)
262.5 fmsl
1.5 ft OK
0
0
0 Recommend more species.
Y (Y or N) OK
(Y or N)
ft
(Y or N)
Y (Y or N) OK
(Y or N)
Y (Y or N) OK
Y (Y or N) OK
2.4 ft/sec Insufficient inlet velocity unless energy dissipating devices are
being used.
N (Y or N) OK
N (Y or N) OK
Y (Y or N) OK
0
on
Form SW401-Bioretention-Rev.8
June 25, 2010 Parts I and 11. Design Summary, Page 2 of 2

Permit Number:
(to be provided by DWQ)
III. REQUIRED ITEMS CHECKLIST
Please indicate the page or plan sheet numbers where the supporting documentation can be found. An incomplete submittal package will
result in a request for additional information. This will delay final review and approval of the project. Initial in the space provided to
indicate the following design requirements have been met. If the applicant has designated an agent, the agent may initial below. If a
requirement has not been met, attach justification.
Pagel Plan
Initials Sheet No.
BDF CG501 1. Plans (1" - 50' or larger) of the entire site showing:
Design at ultimate build -out,
Off -site drainage (if applicable),
Delineated drainage basins (include Rational C coefficient per basin),
Cell dimensions,
Pretreatment system,
High flow bypass system,
Maintenance access,
Recorded drainage easement and public right of way (ROW),
Clean out pipe locations,
Overflow device, and
Boundaries of drainage easement.
BDF CG501 2. Plan details (1" = 30' or larger) for the bioretention cell showing:
- Cell dimensions
Pretreatment system,
High flow bypass system,
Maintenance access,
Recorded drainage easement and public right of way (ROW),
Design at ultimate build -out,
Off -site drainage (if applicable),
Clean out pipe locations,
Overflow device, and
Boundaries of drainage easement.
Indicate the P-Index between 10 and 30
BDF CG501 3. Section view of the bioretention cell (1" = 20' or larger) showing:
Side slopes, 3:1 or lower
Underdrain system (if applicable), and
Bioretention cell layers [ground level and slope, pre-treatment, ponding depth, mulch depth, fill media
depth, washed sand, filter fabric (or choking stone if applicable), #57 stone, underdrains (if applicable),
SHWT level(s), and overflow structure]
BDF ATTACHMENT-G 4. A soils report that is based upon an actual field investigation, soil borings, and infiltration tests. The
ATTACHMENT-H results of the soils report must be verified in the field by DWQ, by completing & submitting the soils
investigation request form. County soil maps are not an acceptable source of soils information. All
elevations shall be in feet mean sea level (fmsl). Results of soils tests of both the planting soil and the in
situ soil must include:
Soil permeability,
Soil composition (% sand, % fines, % organic), and
P-index.
Form SW401-Bioretention-Rev.8
June 25, 2010 Parts I and 11. Design Summary, Page 3 of 4

Permit Number:
(to be provided by DWQ)
BDF CG501 5. A detailed planting plan (1" = 20' or larger) prepared by a qualified individual showing:
(SOD) A variety of suitable species,
Sizes, spacing and locations of plantings,
Total quantity of each type of plant specified,
A planting detail,
The source nursery for the plants, and
Fertilizer and watering requirements to establish vegetation.
BDF CG101 6. A construction sequence that shows how the bioretention cell will be protected from sediment until the
CE101 entire drainage area is stabilized.
BDF ATTACHMENT-D 7. The supporting calculations (including underdrain calculations, if applicable).
BDF ATTACHMENT-B 8. A copy of the signed and notarized inspection and maintenance (I&M) agreement.
N/A N/A 9. A copy of the deed restriction.
Form SW401-Bioretention-Rev.8
June 25, 2010 Parts I and 11. Design Summary, Page 4 of 4