SW4200702_Supplement-EZ Form_20210810

SUPPLEMENT-EZ COVER PAGE
FORMS LOADED
PROJECT
INFORMATION _
1
Project Name
Lewisville Community Center
2
Project Area ac
4.76
3
Coastal Wetland Areal
0
4
Surface Water Area._(aC)
0
High
5
Is this eCt H' h or Low Qer[si
6
1 Does this project use an off -site SCM?
No
COMPLIANCE WITH 02H .1003(4)
7
8
Width of vegetated setbacks prov_idedLfeet
Will the vegetated setback remain vegetated?
If.UlUA is proposed in the setback, does it meet NCAC 02H.10W(%cxq)_
9
10
Is streambank stabilization ff0PGSW on this project?
NUMBER AND TYPE OF SCMS:
11
12
Infiltration System _
Bioretention Cell
1
13
14
Wet Pond
Stormwater Wetland
15
Permeable Pavement
16
Sand Filter
17
Rainwater Harvesting_(RIhIHj
18
Green Roof
19
Level Spreader -Filter Strip (L.S-FS
Disconnected lmpervivus Surface,(01S)
20
21
JTeatmenfSale
22
qry Pond
2$.
Steii'ItFflller
24
Silva Cell
25
i3a3dilter
26
Filterra
FORMS LOADED
DESIGNER CERTIFICATION
27
Name and Title:_
Adam Carroll. PE, Sr. Protect nager
28
anlzation:
Timmons Group_
29
Street address:
8642 W. Market Street, Suite 136
30
31
City, Stake,. Zip; _ _ _
Ahgne numher(s):
Email:
Greensboro, NC, 27409 _
_ _ 336-478-3346
[e-mail]
32
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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Date

DRAINAGE AREAS
1
Is this a high density roiect?
Yes
2
If so number of drainage areas/SCMs
1
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 L�A{�Ep
DRAINAGE
AREA INFORMATION
Entire Site
1
4
Type of SCM
Biocell
5
Total drainage areas .ft
207415
124146
6
Onsite drainage area (sq ft
207415
124146
7
Offsite drainage area (sq ft
8
Total BUA in project (sq ft
82673 sf
73240 sf
9
New BUA on subdivided lots (subject to
ermittin (sq ft)
10permitting)
New BUA not on subdivided lots (subject to
sf
82673 sf
73240 sf
11
Offsite BUA (sq fi
12
Breakdown of new BUA not on subdivided lots:
Parking (sq ft
59478 sf
51600 sf
Sidewalk (sq ft
11311 sf
9921 sf
Roof C§q ft
11719 sf
11719 sf
Roadwaylsq. ft
Future sq ft
Other, please specify in the comment box
below sq.ft)
13
New infiltrating permeable pavement on
subdivided lots (sg ft
14
New infiltrating permeable pavement not on
subdivided lots sq fib
15permitting)
Existing BUA that will remain (not subject to
s. ft
16
Existing BUA that is already permitted (s-q ft)
17
Existing BUA that will be removed (sq_ft)
9953 sf
18
Percent BUA
40%
59%
19
Design storm,(inches)
1.0 in
20
_
Design volume of SCM cu ft
6001 cf
21
Calculation method for design volume
Sim le Method
ADDITIONAL
22
INFORMATION
Please use this space to provide any additional information about the
ldrainage area(s):

BIORETENTION CELL
1
Drainage area number
1
2
_
Minimum Tguired treatment volume du ft _
_.
MRLENUH,
E
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 stapes of the SCM (H:V.)? _
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)?
3:1
6
No
7
Yes
8
Is there an overflow or bypass for inflow volume in excess of the
design volume?
Yes
9
What is the method 1wdewataring;the SCM for maintenance?
Pump (preferred)
Yes
10
If applicable, will the SCM be cleaned out after construction?
11
Does the maintenance access comply with General MDC (a)?
Yes
12
Does the drainage easement comply with General MDC (9)?
If the SCM is on a single family lot, does (will?) the plat comply with
General MDC (10)?
Yes
13
14
Is there an O&M Agreement that complies with General MDC (11)?
Yes
15
Is theraan O&M Plan that compl€es Wlth General MDC (12)?
Yes
16
Does the SCM follow the device specific MDC?
Yes
17
as the SCIVI desig-nay an NC Iicensed professional?
Yet
610RETE"ON
CELL MhC FROM 08H 11052
SHWT elevation (fmsi) <905
Bottom althe bforeienfian celll {fmsl] 909.83
Ponding depth of the design storm (inches) 12 in
ISudace area of the bioretenton_ cell (square feet) 6005 sf
18
19
20
21
22
Design volume of SCM (cu ft)
6005 cf
23
Is the bioretention cell used for peak attenuation?
Yes
24
Depth of peak attenuation over planting surface (in)
12 in
25
HOight of peak attenuation outlet above the planting surface (in).
12 in
26
Infiltration rate of the in s€tu soil (inch/hour)
27
Diameter of the underdrain pipes (it applicable) _
Does the design include Internal Water Storage [1Ws.)?
If so, eievat€on;oi.thetcp of the I W S (Imsl)
Elevation of the planting surface (fmsl)
What type of vegetation will be planted? (grass, trees/shrubs,
other)?
Media depth (inches)
Percentage of medium to coarse washed sand by volume
6 in
28
Yes
29
912.5
30
914
31
32
33
Grass
30 in
75-85%
34
35
Percentage of fines (silt and clay) by Volume_
Percentage of organic matter by volume
8-15%
5-10%
36
Type of organic material
TBD
37
Pihosphorus Index (P-lrtdexjof.medtt3 (unitises]
10 to 50
38
Will compaction be avoided during construction?
Yes
39
40
Will cell be maintained to a one inch/hour standard?
Depth of mulch, if applicable (in_ches)
Yes
NA
41
Type of mulch, if applicable _
How many clean out pipes are being installed?
ype of pretreatment that will be used:
NA
42
43
13
ore ay
ADDITIONAL
44
INFORMATION
Please use this space to provide any additional information about
the bioretention cell(s):
_
Final cell mix to be reviewed and verified to meet NCDEQ prior to
Installation. SHWT was not found in the boring nearest to the biocell. The
depth shown is the termination elevation of the boring.