20061804 Ver 37_Stormwater Supplemental Sheet Signed_20210215

SUPPLEMENT-EZ COVER PAGE
AC,
PROJECT INFORMATION
1 Project Name
2 Project Area (ac)
3 Coastal Wetland Area (ac)
4 SurfaceWaterArea ac)
5 Is this project High or Low DensiV?
6 , Does this project use an off -site SCM?
Ardmore at Flowers
No
COMPLIANCE WITH 02H .1003(4)
_7 _ _ Width of vegetated setbacks provided (feet) 59
8 Will the vegetated setback remain vegetated?_._ Yes
8 Is BUA other that as listed in .1003(4)(c d) out of the setback? Nc
10 Is streambank stabilization proposed on this project? ; No
NUMBER AND TYPE OF SCMs:
11 Infiltration System 0
12 Bioretentio_n Cell
0
13
Wet Pond
1
14
Stortnwater Wetland
0
15
Permeable Pavement
0
16
Sand Filter
0
17
Rainwater Harvestin RWH
0
18
Green Roof
0
19
Level Spreader -Filter stripLS-FS
0
20
Disconnected impervious Surface (DIS
0
21
Treatment Swale
0
22
D Pond
0
23
StormFilter
0
24
Silva Cell
0
25
Bayfilter
0
26
1 Filt ma
0
FORMS LOADED
DESIGNER CERTIFICATION
27 Name and Title.
28 _Organization:
29
Street address:
30
_ City, State, Zip: _
31
Phone number(s):
32
Email:
Barret Hagen, P.E.
Hagen Engineen_ng__
i9 Battleground Ave. Suite
Certification Statement:
1 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.
CARO
a SEAL
30469 =
65 • .NGINE,.• G�i
Date
-67-Z

DRAINAGE AREAS
1 Is this a high density project?Yes
2 If so, number of drainage areas/SCMs 1
3
Is all/part of this project subject to previous rule
versions?No
FORMS LOADED
Entire Site 1
4 Type of SCM Wet Pond
5 Total BUA in project (sq ft)268600 sf 268600 sf
6
New BUA on subdivided lots (subject to
permitting) (sq ft)
7
New BUA outside of subdivided lots (subject to
permitting) (sf)268600 sf 268600 sf
8 Offsite - total area (sq ft)
9 Offsite BUA (sq ft)
10 Breakdown of new BUA outside subdivided lots:
- Parking (sq ft)120000 sf 120000 sf
- Sidewalk (sq ft)28000 sf 28000 sf
- Roof (sq ft)107500 sf 107500 sf
- Roadway (sq ft)13100 sf 13100 sf
- Future (sq ft)
- Other, please specify in the comment box
below (sq ft)
11
New infiltrating permeable pavement on
subdivided lots (sq ft)
12
New infiltrating permeable pavement outside of
subdivided lots (sq ft)
13
Exisitng BUA that will remain (not subject to
permitting) (sq ft)
14 Existing BUA that is already permitted (sq ft)
15 Existing BUA that will be removed (sq ft)
16 Percent BUA 53%69%
17 Design storm (inches)1 in
18 Design volume of SCM (cu ft)24289 cf
19 Calculation method for design volume SIMPLE
20
DRAINAGE AREA INFORMATION
ADDITIONAL INFORMATION
Please use this space to provide any additional information about the
drainage area(s):
WET POND
_ 1 Drainage area number 1
2'; Design volume of SCM (cu ft) 26305 d
GENERAL MDC FROM02H.1050 -
3'i Is the SCM sized to treat the SW from all surfaces at build -out? Yes
i 4' Is the SCM located away from contaminated soils? i Yes
5 What are the side slopes of the SCM (H_V)? 3:1
Does the SCM have retaining walls, gabion walls or other engineered ;
6 side slopes? NO
Are the inlets, outlets, and receiving stream protected from erosion j
7 (10 year storm)? Yes
Is there an overflow or bypass for inflow volume in excess of the
8 design volume? Yes
9 What is the method for dewatering the SCM for maintenance? Drewdown 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
If the SCM is on a single family lot, does (will?) the plat comply with
13 j General MDC (10)? 1 Yes
14 Is there an O&M Agreement that complies with General MDC (11)? 1 Yes
15` Is there an O&M Plan that compiles with General
16, Does the SCM follow the device specific MDC? Yes
17) Was the SCM designed by an NC licensed professional? I Yes
WET POND MDC FROM 021-1.1053
18: Method used j SAIDA
191Has
a stage/storage table been provided in the calculations?
Yes
20
Elevation of the excavated main pod depth (bottom of sediment
removal) (fmsi)
244.00
21
Elevation of the main pod bottom top of sediment removaQ (frnsn
I 245.00
22
FJevatlon of the bottom of the vegetated shelf (fmsq
248.00
23
Elevation of the permanent pod (fmsl)
248.50
241
Elevation of the top of the vegetated shelf (fmsQ
249.00
25
Elevation of the temporary pool (fmsl)
250.50
26
Surface area of the main permanent pod (square feet)
11057A
27 Volume of the main permanent pod (cubic feet)
26065 d
28 Average depth of the main pool (feet)
3.00 It
29 Average depth equation used
5 Equation 2
30 If using equation 3, main pod perimeter (feet)
J
31 If using equation 3, width of submerged veg. shelf (feet)
32
Volume of the forebay (cubic feet)
6333 cf
33
Is this 15-20% of the volume in the main pool?
Yes
34
Clean -out depth for forebay (inches)
12 in
35
Design volume of SCM (cu III)
263M cf
36
Is the outlet an orifice or a weir?
Orifice
37
lf orifice, orifice diameter (inches)
38
Ifweir, weir height (itches)
30 If weir, weir length (inches)
40 Drawd_own time for the temporary pool (days)
Are the intet(s) and outlet located in a manner that avoids short-
41 circuiting?
42 Are berms or baffles provided to improve the flow path?
43 Depth offorebay at entrance (inches)
44 Depth of forebay at exit (etches)
45; Does water flow out of the forebay in a non -erosive manner?
461 Width of the vegetated shelf (feet)
2.35
Yes
No
54 in
54 in
Yes
6 ft
6-1
471
Slope of vegetated shelf (H:V)
48!pernanent
Does the orifice drawdown from below the top surface of the
pool?
Yes
49
Does the pond minimize impacts to the receiving channel from the 1-
yr, 244w storm?
Yes
50
Are fountains proposed? (If Y, please provide documentation that
MDC(9) is met.)
---
;
No
51 Is a trash rack or other device provided to protect the outlet system?d_Yes
52 Are the dam and embankment planted In non -clumping turfgrass?
r5
3 Species of turf that will be used on the dam and embankment
54 Has a planting plan been provided for the vegetated shelf?
Yes
Centipede
Yes
ADDITIONAL INFORMATION j
Please use this space to provide any additional information about the
55wet pond(s):
1
i
Wet Pond 1 2:51 PM 1/7/2021