SW1191001_18-161 - Supplemental EZ_11/26/2019

SUPPLEMENT-EZ COVER PAGE
FORMS LOADED
PROJECT INFORMATION
1
Project Name Rutherfordtoh-Spindele Middle School
Project Area ac 91.61
Coastal Wetland Area ac _ N/A
Surface Water Area ac N!A
Is this ro'ect High or Low Density? High
2
3
4
5
6
Does this project use an off -site SCM?
No
COMPLIANCE WITH 02H .1003(4)
7
Width of ve etated setbacks provided (feet)
j N/A
8
Will the vegetated setback remain vegetated?
Yes
9
Is BUA other that as listed in .1003 4 c-d out of the setback?
Yes
10
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
1 Rainwater Harvesting RWH
0
18
Green Roof
0
19
Level Spreader -Filter Strip LS-FS
0
20
Disconnected Im ervious Surface (DIS)
0
21
Treatment Swale
0
22
Dry Pond
0
23
IStormFilter
0
24
Silva Cell
0
25
Ba ilter
0
26
Filterra
0

FORMS LOADED
DESIGNER CERTIFICATION
27
Name and Title:
Organization:
Kenneth Lorin - Prinet al
28
CLH Design PA
29
Street address:
400 Reaancv Forest Drive Suite 120
30
City, State, Zl :
Cafy, NC
31
Phone numbers :
919.319.671E
32
Email:
87516
CCoallitation Slalemenl:
aorlo-
7t'..irr"�'
''-I t•'•'illflli �_-:'1 _ .:'i --I:
wilh the Inlormamn provided +tare
� �4J �Ol ti±��F� ; ' •M1rz i
22 'S
SEAL
23953
••LaQ %
Si alure Pf Designer
/%•Z 6—
Date

DRAINAGE AREAS
FEveIrsions?
a hi h densit roject? Yesnumber of draina a areas/SCMs 2
art of this project subject to previous rule
No
FORMS LOADED
_. ,
l�
a
IType of SCM
-
Wet Pond
Wet Pond
5
JTotal BUA in project (sq ft
599243 sf
19ti675 sf
355606 sf
6
New BUA on subdivided lots (subject to
ermittin s ft
0
0
0
7permitting)
New BUA outside of subdivided lots (subject to
sf
599243 sf
196675 st
355606 SF
8
Olisite • to area s9 ft
sf
sl
sf
9
Offsite BUA(sq It)
0
0
0
10
Breakdown of new BUA outside subdivided lots:
Parking (sq ft
91719 sf
0
91719 sf
Sidewalk It)
67102 st
7778 sf
56516 sl
Roof (sq ft
110907 sf
0
110907 sf
_
Roadway s it
123753 s[
30734 st
93019 sf
- Future (sq ft
3445 sl
0
3445 st
Other, please specify in the comment box
below (sq ft
158163•sl
158i63 sl
0
11
New infiltrating permeable pavement on
subdivided lots (sq ft
0
0
0
12
New infiltrating permeable pavement outside of
subdivided lots (sq ft
(}
0
0
13permitting)
Exisitng BUA that will remain (not subject to
s ft
61075 sf
0
0
14
Existing BUA that is alread armitted 11
0
0
0
15
Existina BUA that will be removed (sq f1
16921 sf
0
0
16
Percent BUA
150%
45%
30%
17
Desi n storm inches
1 1n
1 in
1 in
18
Design volume of SCM cu ft
18709 of
39578 cf
19
Calculet ien method for desig n volume
HRT
HRT
AD1}EiIDHAL
FORMATION
20
_
Please use this space to provide any additional information about the
drainage aiaa(s):
Other BUA Includes the track portion of track and field

WET POND
­71Drainage
area number I 2
2
Dos[gn volume 61 SCM (cu ftj 16582 of 31409 cf
Is the SCM sized to treat the SW from all surfaces at build -out? Yob a es
3
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
6
Does the SCM have retaining walls, gabton walls or other engineered
side slopes?
No
No
7
Are the 'inlets, outlets, and receiving stream protected from erosion
(10-year storm)?
Yes
Yes
a
Is there an overflow or bypass for -inflow volume in excess of the
design volume?
No
No
9
What is the method for dewa[ering the SCM for maintenance?
Drawdown Orifice
Drawdown Orifice
i0
If applicable, win [he SCM be cleaned out after construction?
No
No
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
tl the M s on a single family lot, does (will?) the plat comply with
General MDC (10)?
No
No
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
16
Does the SCM follow [he device specific MDC?
Yes
Yes
17 Was the SCM ft�gried by an NIC Hoen9ed pa sssgrW?
WET
18 Meltiod used
HRT
Yes
HRT
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) (Imsl)
99T00
994-50
21
Elevation of the main pool bottom-(k1p of sediment removal) (fmsl)
997.50
995.00
22
Elevation of the bottom of the vegetated shelf (fmsl)
1003.U
23
Elevation of the permanent pool (fmsl)
1003.0
24
Elevation of the top of the vegetated shelf (fmsl)
1004.0
25
Elevation of the temporary pool (fmsl)
1004.0
26
Surface area 01 the main permanent pool (square feet)
11780:1
2
Volume of the main permanent pool (cubic fee[
40520of
cf
28
Average depth of the main pool (feet)
3.99 Itt
29
Average depth equation used
Equationquation
3
30
If using equation 3, main pool perimeter (feet)
n/a
n/a
31
II using equation 3, width of submerged veg. shelf (feet)
Na
n/a
32
Volume of the forebay (cubic feet)
6252 cf
18423 cf
33
Is this 15-20 % of the volume in the mainpool?
Yes
es
34
Clean -out depth for forebay (inches)
6 in
Bin
35
Design volume of SCM (cu it)
18709 cf
39578 of
36
Is the outlet an orifice or a weir?
Orillice
Orifice
37
If orifice, orifice diameter (inches)
2 in
2.5
36
If weir, weir height (inches)
n/a
n/a
39
If weir, weir e
n/a
n/a
40
hinthes
Drawdown t me Fo[heempo
2.9
4.1
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?
No
No
43
Depth of forebay at entrance (inches)
54 in
54 in
44
Depth of forebay at exit (inches)
54 in
54 In
45
Does water flow out of the forebay in a non -erosive manner?
Yes
Yes
46
Width of the vegetated shelf (feet)
6 it
6 rt
47
Slope of vegetated shelf (H:V)
6:1
6:1
48
Does the orifice drawdown from below the top surface of the
permanent pool?
Yes
Yes
49
Does the pond minimize impacts to the receiving channel from the 1
yr, 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 turfgrass?
Yes
Yes
53
Species of turf that will be used on the dam and embankment
_
a arcing p an peen provided rot the vegetateds
os es
TIONAL
INFORMATION
55
use this space to pfavide any additional infgrmallon abuui the
w81Please (s):
Wet Pond 4 1:32 PM 11/26/2019