SW1191201_Supplement-EZ Form_20210825

SUPPLEMENT-EZ COVER PAGE
FORMS LOADED
PROJECT INFORMATION
1 iProject Name
NCNG Morganton Regional Readiness Center
2 1 Pro'ect Area ac
34.4
3 lCoastal Wetland Area ac
0
4 Surface Water Area ac
0.6
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#11sBUA
of vegetated setbacks provided (feet)
50
8e
vegetated setback remain ve etated?
Yes
9
other that as listed in .1003 4 c-d out of the setback?
No
10
1 Is streambank stabilization proposed on this project?
No
NUMBER AND TYPE OF SCMs:
11
Infiltration System
0
12
Bioretention Cell
0
13
Wet Pond
2
14
Stormwater Wetland
0
15
Permeable Pavement
0
16
Sand Filter
0
17
Rainwater Harvesting RWH
0
18
Green Roof
0
19
Level Spreader -Filter Strip LS-FS
0
20
IDisconnected Impervious Surface (DIS)
0
21
ITreatment Swale
0
22
bry Pond
0
23
I StormFilter
0
24
[Silva Cell
0
25
Bayfilter
0
26
Filterra
0
FORMS LOADED
DESIGNER CERTIFICATION
27
IName and Title:
Frank Slinsk , P.E., Senior Project Manager
28
Or anization:
Timmons Grou
29
Street address:
5410 Trinity Road, Suite 102
30
City, State, Zip: _
number(s):
!Email:
Raleigh, NC, 27607
31 jPhone
[phone]
32
[e-mail]
Certification Statement:
I certify, under penalty of law that this Supplement-FZ 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.
` �'�• ' (r ram.
e� SAD Y
•� � .
.Q SEAL. ')7;
033612
Signature of Designer
Date
8/tC,/I6ZI

DRAINAGE AREAS
Elss a hi h densi roect? Yes
number of draina a areas/SCMs 2
art of this project subject to previous rule
ns? No
FDRMSLDADED
DRAINAGE AREA INFORMATION
Entire Site
1
2
4
Ty2e of SC M
Wet Pond
Wet Pond
5
Total BUA in project (scl ft
733796 sf
570010 sf
163786 sf
6
New BUA on subdivided lots (subject to permitting)
(sq ft
733796 sf
_
7
New BUA outside of subdivided lots (subject to
ermittin s
570010 sf
163786 sf
8
Offsite - total area s . ft
9
Offsite BUA (sq ft
10
Breakdown of new BUA outside subdivided lots:
Parking (sq ft
526936 sf
465306 sf
61657 sf
Sidewalk �sq ft
33389 sf
33389 sf
—
Roof (sq ft
66486 sf
_
64267 sf
2219 sf
- Roadway s ft
5045 sf
—
5045 sf
- Future (sq ft
101913 sf
7048 sf
94865 sf
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
permittin sq ft
_
14
Existing BUA that is already permitted (sq ft
15
Existing BUA that will be removed (sq ft
16
Percent BUA
49%
76%
81%
17
Desi n storm inches
1 in
1 in
18
Desi n volume of SCM cu ft
45874 cf
13124 of
19
Calculation method for design volume
Simple Method
Simple Method
ADDITIONAL INFORMATION
20
Please use this space to provide any additional information about the
draina a areas :

WET POND
III 1�Drainage area number A2 B1
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
Does the SCM have retaining walls, gabion walls or other engineered
6
side slopes?
No
No
Are the inlets, outlets, and receiving stream protected from erosion
7
(10-year storm)?
Yes
Yes
Is there an overflow or bypass for inflow volume in excess of the
8
design volume?
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)?
If the SCM is on a single family lot, does (will?) the plat comply with
13
General MDC (10)?
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
an
18 Method used
SA/DA
SA/DA
19 Has a stage/storage table been provided in the calculations?
Yes
Yes
Elevation of the excavated main pool depth (bottom of sediment
20
removal) (fmsl)
1196.00
1203.50
21
Elevation of the main pool bottom -(top of sediment removal) (fmsl)
1197.00
1204.00
22 Elevation of the bottom of the vegetated shelf (fmsl)
1201.00
1210.00
23 Elevation of the permanent pool (fmsl)
1201.50
1210.50
24 Elevation of the top of the vegetated shelf (fmsl)
1202.00
1211.00
25 Elevation of the temporary pool (fmsl)
1203.10
1212.25
26 Surface area of the main permanent pool (square feet)
21548.00
5701.00
27 Volume of the main permanent pool (cubic feet)
71664 cf
18510 cf
30� If using equation 3, main pool perimeter (feet)
31 If using equation 3, width of submerged veg. shelf (feet)
32 Volume of the forebay (cubic feet)
11876 cf
2940 cf
33 Is this 15-20% of the volume in the main pool?
Yes
Yes
34 Clean -out depth for forebay (inches)
54 in
51 in
35 Design volume of SCM (cu ft)
45874 cf
13124 cl
36 Is the outlet an orifice or a weir?
Orifice
Orifice
37 If orifice, orifice diameter (inches)
3.5 in
1.5 in
38 If weir, weir height (inches)
39 If weir, weir length (inches)
40 Drawdown time for the temporary pool (days)
2.4
3.6
Are the inlet(s) and outlet located in a manner that avoids short-
41
circuiting?
Yes
Yes
42 Are berms or baffles provided to improve the flow path?
No
No
43 Depth of forebay at entrance (inches)
66 in
60 in
44 Depth of forebay at exit (inches)
60 in
57 in
45 Does water flow out of the forebav in a non -erosive manner?
Yes
Yes
Does the orifice drawdown from below the top surface of the
48 permanent pool? Yes Yes
Does the pond minimize impacts to the receiving channel from the 1
49 yr, 24-hr storm? Yes Yes
Are fountains proposed? (If Y, please provide documentation that
50 MDC(9) is met.) No No
511 Is a trash rack or other device provided to protect the outlet system? I Yes Yes
)ITIONAL INFORMATION
Please use t„Is s ace to rovide an additional information about the
p p Y
55 wet pond(s):
;el is state owned land, therefore no drainage easement is required.
Wet Pond 1 10:06 AM 8/25/2021