SW6200102_Supplement-EZ Form_20200716

SUPPLEMENT-EZ COVER PAGE
FORMS LOADED
1 !Project Nam
2 Proiec Ae
rea (
Area
h or Low Density?
use an off -site SCM?
HPTC
4.76
0
0
High
No
COMPLIANCE WITH 02H .1003(4)
7 Width of vegetated setbacks provided (feet) 10
8
Will the vegetated setback remain vegetated?
Yes
9
Is BUA other that as listed in .1003 4 (c-d) out of the setback?
Yes
10
Is streambank stabilization proposed on this project?
No
TYPE OF SCMs:
Cell
Filter
Dry Pond
StormFi@er
25 'Bayfilter
26 Filterra
El
FORMS LOADED
gNMEARNMCATION
27
Name and Title: F. Michael Mayer, PE Civil Engineer
28
Organization:
Mason & Hanger
29
Street address:
300 W Vine St Suite 1300
30
City, State, Zip:
Lean ton, KY 40507
31
Phone number(s):
859-280-3557
32
Email:
__.
mike. ma e
y [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, specifcetions, 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 high density project?
Yes
2
If so, number of drainage areas/SCMs
2
3
Is all/ of this project subject to previous rule
versions?
No
FORMS LOADED
DRAINAGE AREA INFORMATION
Entire Site
1
2
4
Type of SCM
Bioretention
Bioretention
Bioretention
5
Total BUA in project (sq ft)
113581 sf
67546 sf
46035 sf
6
New BUA on subdivided lots (subject to
permitting) (sq ft)
sf
sf
sf
7
New BUA outside of subdivided lots (subject to
permitting) (sf)
113581 sf
67546 sf
46035 sf
8
Offsite - total area (sq ft)
sf
sf
sf
9
Offsite BUA (sq ft)
sf
sf
sf
10
Breakdown of new BUA outside subdivided lots
sf
sf
sf
Parking (sq ft)
15350 sf
8500 sf
6850 sf
Sidewalk (sq ft)
6442 sf
2042 sf
4400 sf
Roof (sq ft)
46014 sf
30894 sf
15120 sf
Roadway (sq ft)
25827 sf
6162 sf
19665 sf
Future (sq ft)
sf
sf
sf
Other, please specify in the comment box
below (sq ft)
19948 sf
19948 sf
sf
11
New infiltrating permeable pavement on
subdivided lots (sq ft)
sf
sf
sf
12
New infiltrating permeable pavement outside of
Isubdivided lots (sq ft)
sf
sf
sf
13
Exisitng BUA that will remain (not subject to
permitting) (sq ft)
sf
sf
sf
14
Existing BUA that is already permitted (sq ft)
sf
sf
sf
15
Existing BUA that will be removed (sq ft)
4782 sf
2570 sf
2212 sf
16
Percent BUA
55%
60%
76%
17
Design storm (inches)
1 in
1 in
1 in
18
Design volume of SCM (cu ft)
7170 cf
4282 cf
2888 cf
19
Calculation method for design volume
SCS
SCS
SCS
ADDITIONAL INFORMATION
Please use this space to provide any additional information about the
20 drainage area(s):
Drainage Area 1 includes area of outdoor astroturf area. Underdrains from
turf area lead to Bioretention Area 1.

BIORETENTION CELL
1
1 Drainage area number
1
qcf
2
Design volume of SCM (cu ft)
4282 cf
288
GENERAL MDC FROM 02H .1050
3
Is the SCM sized to treat the SW from all surfaces at build -out?
Yes
Yes
4
Is the SCM located away from contaminated soils?
Yes
Yes
5
What are the side slopes of the SCM (H:V)?
3:1
3:1
6
Does the SCM have retaining walls, gabion walls or other engineered side
slopes?
No
No
7
Are the inlets, outlets, and receiving stream protected from erosion (10-
year storm)?
Yes
Yes
8
Is there an overflow or bypass for inflow volume in excess of the design
Ivolume.
Yes
Yes
9
What is the method for dewatering the SCM for maintenance?
Drawdown Orifice
Drawdown
Orifice
10
If applicable, will the SCM be cleaned out after construction?
Yes
Yes
11
Does the maintenance access comply with General MDC (8)?
Yes
Yes
12
Does the drainage easement comply with General MDC (9)?
Yes
Yes
13
If the SCM is on a single family lot, does (will?) the plat comply with
JGeneral MDC (10)?
Yes
Yes
14
Is there an O&M Agreement that complies with General MDC (11)?
Yes
Yes
15
Is there an O&M Plan that complies with General MDC (12)?
Yes
Yes
16
Does the SCM follow the device specific MDC?
Yes
Yes
17
Was the SCM designedy an NC licensedprofessional?
Yes
Yes
BIORETENTION
CELL MDC FROM 02H .1052
18
SHWT elevation (fmsl)
245.08
248.87
19
Bottom of the bioretention cell (fmsl)
252.50
254.50
20
Ponding depth of the design storm (inches)
9 in
9 in
21
Surface area of the bioretention cell (square feet)
8400 sf
4500 sf
22
Design volume of the bioretention cell (cubic feet)
6225 cf
3788 cf
23
Is the bioretention cell used for peak attenuation?
Yes
Yes
24
Depth of peak attenuation over planting surface (in)
24 in
24 in
25
Height of peak attenuation outlet above the planting surface (in)
18 in
18 in
26
Infiltration rate of the in situ soil (inch/hour)
1 in/hr
1 in/hr
27
Diameter of the underdrain pipes (if applicable)
6 in
6 in
28
Does the design include Internal Water Storage (IWS)?
Yes
Yes
29
if so, elevation of the top of the IWS (fmsl)
254.5
256.5
30
Elevation of the planting surface (fmsl)
256
258
31
What type of vegetation will be planted? (grass, trees/shrubs, other)?
Grass
Grass
32
Media depth (inches)
30 in
30 in
33
Percentage of medium to coarse washed sand by volume
85%
85%
34
Percentage of fines (silt and clay) by volume
10%
10%
35
Percentage of organic matter by volume
5%
5%
36
IType of organic material
Engineered Fill
Engineere
d Fill
37
Phosphorus Index (P-Index) of media (unitless)
10
10
38
Will compaction be avoided during construction?
Yes
Yes
39
Will cell be maintained to a one inch/hour standard?
Yes
Yes
40
Depth of mulch, if applicable (inches)
n/a
n/a
41
Type of mulch, if applicable
n/a
n/a
42
How many clean out pipes are being installed?
10
6
43
Type of pretreatment that will be used:
Vegetative
Filter/Rip Rap
Vegetativ
e
Filter/Rip
Rap
ADDITIONAL INFORMATION
Please use this space to provide any additional information about the
44 bioretention cell(s):
The engineered fill will infiltrate at approximately 2in/hr (maintained at a min 1 in/hr),
which will eliminate the surfae ponded volume within 24 hours, to the storage within
the IWS for ultimate infiltration. Peak attenuation volumes provided in order to
comply with EISA 438. Project based entirely within Fort Bragg (US Gov't property).