SW3220302_Supplement-EZ Form_20220601

SUPPLEMENT-EZ COVER PAGE
FORMS LOADED
PROJECT INFORMATION
1 Project Name
2 Project Area ac
3 Coastal Wetland Area ac
Denver Defense
4.494
N/A
N/A
4
Surface Water Area ac
5
Is this project High or Low Densit ?
High
6
Does this project use an off -site SCM?
No
COMPLIANCE WITH 02H .1003(4)
7
Width of vegetated setbacks provided feet
30
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 ?
I N/A
10
1 Is streambank stabilization proposed on this project?
I 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
1
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
Storm Filter
24
Silva Cell
25
JBayfilter
26
IFilterra
FORMS LOADED
DESIGNER CERTIFICATION
27
Name and Title:
Jay Henson, Principal
28
Or anization:
HensonFole
29
Street address:
121 Gilead Rd.
30
City, State, Zip:
Huntersvill, NC, 28078
31
JPhone numbers :
704-875-1615
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.
CAR
PNDS •� /
w �
eal
Signature # Designer
Date
5/24/2022

DRAINAGE AREAS
1
Is this a high density project?
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 LOADED
AREA INFORMATION
Entire Site
1
4
Type of SCM
N/A
sand filter
5
Total draina a area s ft
195759
119602
6
Onsite draina e area s ft
195759
117333
7
Offsite draina a area s ft
0
2116
8
Total BUA in project (sq ft)
103998 sf
103998 sf
9permitting)
New BUA on subdivided lots (subject to
s ft
N/A
N/A
10permitting)
New BUA not on subdivided lots (subject to
sf
88385 sf
53641 sf
11
JOffsite BUA (sq ft
N/A
2116 sf
12
Breakdown of new BUA not on subdivided lots:
Parking (sq ft
51222 sf
40041 sf
Sidewalk (sq ft
1600 sf
1600 sf
Roof (sq ft
17203 sf
12000 sf
Roadway s ft
Future (sq ft
17360 sf
Other, please specify in the comment box
below (sq ft
1000 sf
13
New infiltrating permeable pavement on
subdivided lots (sq ft
N/A
N/A
14
New infiltrating permeable pavement not on
subdivided lots (sq ft
N/A
N/A
15
Existing BUA that will remain (not subject to
ermitting) (sq ft
33973 sf
17172 sf
16
Existing BUA that is already permitted (sq ft
17
Existing BUA that will be removed (sq ft
16572 sf
2900 sf
18
Percent BUA
63%
61 %
19
Design storm inches
1.0 in
1.0 in
20
Design volume of SCM cu ft
n/a
4611 cf
21
lCalculation method for design volume
I n/a
Simple RV method
ADDITIONAL INFORMATION
22
Please use this space to provide any additional information about the
drainage area(s):
With site conditions it was found impossible to get all new BUA to BMP. As
a comprimise, some existing BUA would be taken to bmp and that the final
BUA number to BMP was greater than proposed BUA. Other BUA is to
account for the Masonry wall around the site

SAND FILTER
ERAL MDC IMM 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
desi n volume?
Yes
9
What is the method for dewatering the SCM for maintenance?
Drawdown Orifice
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
151
Is there an O&M Plan that complies with General MDC (12)?
Yes
161
Does the SCM follow the device specific MDC?
Yes
17
Was the SCM designed by an NC licensedprofessional?
Yes
SAND FILTER
MDC FROM 02H .1056
18
SHWT elevation (fmsl)
831.5
19
Type of sand filter (open or closed)
Open
20
If closed, will the filter will be pre -cast or pour -in -place?
21
If closed, top of grate elevation (fmsl)
22
Is this sand filter designed to attenuate peak flows?
Yes
I Sediment Chamber
23
Volume that can be retained in the sediment chamber (cubic feet)
2305 cf
24
Will there be a permanent pool in the sediment chamber?
No
25
Bottom of the sediment chamber (fmsl)
842.00
26
Area of the sediment chamber (square feet)
500 sf
27
Physical depth of the sediment chamber (inches)
18 in
28
Ponding depth in the sediment chamber, above any permanent
pool (inches)
18 in
29
Elevation of top of weir between chambers (fmsl)
843.5
I Sand Chamber
30
Volume that can be retained in the sand chamber (cubic feet)
2305 cf
31
Bottom of the sand chamber (fmsl)
841.50
32
Area of the sand chamber (square feet)
525 sf
33
Physical depth of the sand chamber (inches)
24 in
34
Ponding depth in the sand chamber, above the sand surface
(inches)
24 in
351
Elevation of the bypass device (fmsl)
843.5
36
Type of bypass device
6" ORIFICE
37
Mechanism for distributing flow over the sand surface
RIP -RAP BERM
38
Sand specification for sand chamber
ASTM C33
39
Depth above underdrain pipe (inches)
18 in
40
Will the media be maintained to drain at least two inches per hour at
the sand surface?
Yes
41
Is at least one clean -out pipe provided at the low point of each
underdrain line?
Yes
42
Will clean -out pipes be capped?
Yes
ADDITIONAL
INFORMATION
43
Please use this space to provide any additional information about
the sand filter(s):
Sand Filter 1 3:22 PM 5/24/2022