HomeMy WebLinkAboutSW6220301_Supplement-EZ Form_20220325SUPPLEMENT-EZ COVER PAGE
FORMS LOADED
PROJECT INFORMATION
1
Project Name
1 Project Area (ac)
Long Point Subdivision
2
34.14
-
3
Coastal Wetland Area ac
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 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 ?
_
No
10
Is streambank stabilization proposed on this project?
No
NUMBER AND TYPE OF SCMs:
11
Infiltration System
1
12
Bioretention Cell
0
13
Wet Pond
2
14
Stormwater Wetland
0
15
Permeable Pavement
0
16
Sand Filter
0
0
17
Rainwater Harvesting RWH
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
0
23
StormFilter
0
24
Silva Cell
0
25 113ayfilter
0
26 1
Filterra
0
FORMS LOADED
DESIGNER CERTIFICATION
27
Name and Title:
Carlo Pardo. PE
28
Organization:
Bowman North Carolina. Ltd.
29
Street address:
4006 Barrett Drive, Suite 104
30
City, State, Zip:
Raleigh. NC 27609
31
Phone numbers :
919-553-6570
32
Email:
cpardo@bowman.com
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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Slgnalure of Designer
Date
DRAINAGE AREAS
1
Is this a high density project?
Yes
2
If so, number of drainage areas/SCMs
3
3
Does this ro�ect 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
Type of SCM
-
Wet Pond
Wet Pond
Infiltration Basin
5
Total drainage area (sq ft)
1487139 sf
384558
113843
424106
6
Onsite drainage area (sq ft
1487139 sf
384558
113843
424106
7
Offsite drainage area (sq ft
8
Total BUA in project (sq ft
336735 sf
139536 sf
47257 sf
147943 sf
9
New BUA on subdivided lots (subject to permitting)
(sq ft
10permitting)
New BUA not on subdivided lots (subject to
(sf)
11
Offsite BUA (sq ft
12
Breakdown of new BUA not on subdivided lots:
- Parking (sq ft
- Sidewalk (sq ft
1766 sf
1766 sf
Roof (sq ft
242000 sf
104000 sf
26000 sf
112000 sf
- Roadway s ft
85615 sf
35536 sf
12137 sf
35943 sf
- Future (sq ft
- Other, please specify in the comment box
below s ft
7354 sf
7354 sf
13
New infiltrating permeable pavement on
subdivided lots (sq ft
14
New infiltrating permeable pavement not on
subdivided lots sq ft
15permitting)
Existing BUA that will remain (not subject to
s ft
16
Existing BUA that is already permitted (sq ft
17
Existing BUA that will be removed (sq ft
9318 sf
931$ sf
18
Percent BUA
22 64%
36.3%
42%
35%
19
1 Design storm inches
1.0 in
1.0 in
1.0 in
20
1 Design volume of SCM cu ft
12068 cf
4029 cf
12863 cf
21
lCalculation method for design volume
Simple Method
Simple Method
1 Simple Method
ADDITIONAL INFORMATION
22
Please use this space to provide any additional information about the
draina a areas :
Entire Site: Existing 9,318 sf Impervious Area to be removed from DA2
Other: Pool & Building from DA2
There is 1,999 sf of impervious roadway area that will bypass Wet Pond 2
WET POND
1
Drainacle area number
1
2
21
Minimum fe uired treatment volume cu ft
12068 cf
4029 cf
GENERAL
MOC 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: ?
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- ear storm)?
Yes
Yes
8
Is there an overflow or bypass for inflow volume in excess of the
design volume?
Yes
Yes
9
What is the method for clewatering the SCM for maintenance?
Pump (preferred)
Pump (preferred)
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
General MDC 10 ?
N/A
N/A
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)?
1 Yes
Yes
161
Does the SCM follow the devicespecific MDC?
Yes
Yes
17
Was the SCM designed by an NC licensedprofessional?
Yes
Yes
WET PQNQ
MQC FROM 02H .1053
18
Sizing method used
SA(DA
SA/DA
19
Has a stage/storage table been provided in the calculations?
Yes
Yes
20
Elevation of the excavated main pool depth (bottom of sediment
removal) (fmsl
250.00
247.00
21
Elevation of the main pool bottom (top of sediment removal) (fmsl)
251.00
248.00
22
Elevation of the bottom of the vegetated shelf (fmsl)
258.50
252.50
23
Elevation of the permanent pool fmsl
259.00
253.00
24
Elevation of the top of the vegetated shelf (fmsl)
259.50
253.50
25
Elevation of the tem ora pool (fmsl)
259.80
253.80
26
Surface area of the main permanent pool (square feet
11690
2850
27
Volume of the main permanent pool (cubic feet)
42894 cf
6423 cf
28
Average depth of the main pool feet
4.47 ft
3.02 ft
29
1 Average depth euation used
Equation 3
Equation 3
30
If using a uation 3, main pool perimeter (feet)
747.0 ft
274.0 ft
31
If using equation 3, width of submerged veg. shelf feet
3.0 ft
3.0 ft
32
Volume of the foreba (cubic feet)
8120 cf
1024 cf
33
Is this 15-20% of the volume in the mainpool?
Yes
Yes
34
Clean -out depth for foreba inches
18 in
18 in
35
Design volume of SCM (cu ft
12068 cf
4029 cf
36
1 Is the outlet an orifice or a weir?
Orifice
Orifice
37
If orifice, orifice diameter (inches)
1.75 in
1.00 in
38
If weir, weir height (inches
39
If weir, weir length inches
40
Drawdown time for the temporary pool (days)
2.52
2.40
41
Are the inlet(s) and outlet located in a manner that avoids short-
circuiting?
Yes
Yes
42
Are berms or baffles provided to improve the flowpath?
Yes
Yes
43
Depth of forebay at entrance (inches)
30 in
30 in
44
Depth of forebay at exit (inches)
24 in
24 in
45
Does water flow out of the forebay in a non -erosive manner?
Yes
Yes
46
Width of the vegetated shelf feet
6 ft
6 ft
47
Slope of vegetated shelf H:
6:1
6:1
48
Does the orifice drawdown from below the top surface of the
permanentpool?
Yes
Yes
49
Does the pond minimize impacts to the receiving channel from the 1
r 24-hr storm?
Yes
Yes
-
50
Are fountains proposed? (If Y, please provide documentation that
MDC(9) is met.
No
No
51
Is a trash rack or other device provided to protect the outlet system?
Yes
Yes
52
Are the dam and embankment planted in non -clumping turf grass?
Yes
Yes
53
Species of turf that will be used on the dam and embankment
Hybrid Bermuda
Hybrid Bermuda
54
Hasa plantinO Dian been Drovided for the vegetated shelf?
Yes
Yes
ADDITIONAL
INFORMATION
55
Please use this space to provide any additional information about
the wet pond(s):
Entire Site: Existing 9,318 sf Impervious Area to be removed from DA2
There is 1,999 sf of impervious roadway area that will bypass Wet Pond 2
Wet Pond 1 1:21 PM 3/14/2022
INFILTRATION SYSTEM
1 Drainage area number 3
2 1 Minimum required treatment volume (cu ft) 128633 cf
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 or enter "Vertical' for
trenches)?
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-yea r storm)?
Yes
8
Is there an overflow or bypass for inflow volume in excess of the
design volume?
Yes
9
jWhat 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)?
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 designed by an NC licensedprofessional?
Yes
INFILTRATION
SYSTEM MDC FROM 02H .1051
18 1
Proposed slope of the subgrade surface(%)
0%
19 jAre
terraces or baffles provided?
No
20 IType
of pretreatment:
Forebay
I Snlh nntn
21
Was the soil investigated in the footprint and at the elevation of the
infiltrations stem?
Yes
22
SHWT elevation fmsl
241.00
23
Depth to SHWT per soils report (in)
87.60
24
Ground elevation at boring in soils report (fmsl)
248.30
25
Is a detailed hydrogeologic study attached if the separation is
between 1 and 2 feet?
N/A
26
Soil infiltration rate inlhr
11.00
27
Factor of safes (FS) (2 is recommended):
2.00
Elevations
29 Bottom elevation (fmsl)
246 ft
30 Stora a elevation fmsl
247.1 ft
31 1 Bypass elevation (fmsl)
249.9 ft
For Basins Only
32
1 Bottom surface area ft2
11195 ft
33
IStorage elevation surface area (ft2)
13240. ft
For Trenches Onlv
34
Length(ft
35
Width (ft)
36
Perforated pipe diameter, if applicable (inches)
37
Number of laterals
38
Total length of perforated piping
39
Stone type, if applicable
40
Stone porosity
41
Is stone free of fines?
42
Is the stone wrapped in Qeotextile fabric?
43
Has at least one inspection port been provided?
Volumes/Drawdown
44 IDesign volume of SCM (cu ft) 12863 cf
45 1 Time to draw down hours) 2.5 hrs
ADDITIONAL INFORMATION
46 Please use this space to provide any additional information about the
infiltration system(s):
Infiltration 1 3:02 PM 3/14/2022