HomeMy WebLinkAboutWPO201400067 Plan - VSMP Minor Amendment 2018-11-0247'
465
455
445
435
425
415
405
395
0+00 0+50
STORM SEWER PROFILE A
HORZ SCALE.- 1 30'
VERT SCALE, 1 W 10'
1+00
1+50
2+00
2+50
3+00
3+50
4+00
4+50
5+00
5+50
6+00
475
465
BIORETENTION AS -BUILT SURVEY
PERFORMED ON:
455
AUGUST 6, 2018
445
435
425
415
405
395
6+50
465
455
445
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\---Hydraulic Grade Line I
\L.New 8'�-115"RCP 4 0.5(x% _
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0+50
STORM SEWER PROFILE B
\�-50VHORZ SCALE. 1" = 30'
VERT SCALE: 1" = 10'
-'IN --go — ------ --->
BIORETENTION-LEVEL 2 DETAIL
SCALE: , 1
f-2' Gravel Diaphragm
Flow Spreader
SECTION VIEW
Pretreatment Cell
Elev = 4510
9=
0.0'
465
455
445
NOTES-
1. Bioretention shall be installed in compliance with VA
DEQ Storrnwater Design Specification No, 9.
Filter media shall consist of the following:
�2
00
Ln
Lf)
Species
Quantity
minimum size
0
Switch Grass
panicum virgat um
-1-0-0
8% sail fines,
P-2
Cardinal Flower
Lobelia cordinalls
5% organic matter;
C\2
Common
Winterberr
P --Index of 20.
0
30" Height
0
C'2
CL
00
>
outfall structure for the new Bioretention. Remove
C:
existing top and replace with riser section that has
E -
E
z
0
L'J
Z
o. 6"wide x 3" tall weir, elevation=453.50
0
0
(N
cn
ry
ry
c. Antivortex device.
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D
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0
0
0
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SHEET NO.
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SHEET
3 of- 9
0
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M
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0
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0
U
0
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7
U,
O
C)
NOTES-
1. Bioretention shall be installed in compliance with VA
DEQ Storrnwater Design Specification No, 9.
Filter media shall consist of the following:
LANDSCAPING
00
Ln
Lf)
Species
Quantity
minimum size
87% sand;
Switch Grass
panicum virgat um
-1-0-0
8% sail fines,
P-2
Cardinal Flower
Lobelia cordinalls
5% organic matter;
C\2
Common
Winterberr
P --Index of 20.
CJ
30" Height
0
C'2
CL
00
>
outfall structure for the new Bioretention. Remove
C:
existing top and replace with riser section that has
E -
E
z
0
L'J
Z
o. 6"wide x 3" tall weir, elevation=453.50
0
0
b, Riser crest elevation = 454.00
C)
c. Antivortex device.
(D
E
z
r
D
w
NOTES-
1. Bioretention shall be installed in compliance with VA
DEQ Storrnwater Design Specification No, 9.
Filter media shall consist of the following:
LANDSCAPING
00
Ln
Lf)
Species
Quantity
minimum size
87% sand;
Switch Grass
panicum virgat um
-1-0-0
8% sail fines,
P-2
Cardinal Flower
Lobelia cordinalls
5% organic matter;
S-1
Common
Winterberr
P --Index of 20.
CJ
30" Height
3. Existing Structure 4 shall be modified to become the
CL
outfall structure for the new Bioretention. Remove
C:
existing top and replace with riser section that has
E
the following:
L'J
o. 6"wide x 3" tall weir, elevation=453.50
0
0
b, Riser crest elevation = 454.00
C)
c. Antivortex device.
(D
E
C
n
r
D
LLJ
0
0
0
(')
BIORETENTION
_F
LANDSCAPING
Key
Name
Species
Quantity
minimum size
P-1
Switch Grass
panicum virgat um
-1-0-0
P-2
Cardinal Flower
Lobelia cordinalls
100
S-1
Common
Winterberr
[lex verticiflatto
40
30" Height
S-2 Wax Myrtle Myrica cerifera 40 30
-- -------- I-
1. Perennials, shrubs and switchgross shall be evenly
distributed across filter media.
Fj`r__H0T1Ec)' AS -BUILT CONDITION"
Bioretention Area Calculations
Area Required = (1.25 * Tv)/Storage Depth
= (1,25 * 1911)/2.0:')= 1165 SF
Area Provided =60* 20= 1200SF
TV= 1911 CF
PondingVr= 1.00
Media Vr= 0.25
Gravel Vr= 0.40
,Storage Depth= (0.5*1)+(3*0.25)+(2*0,4) = 2.05 FT
—Pre -Treatment Cell - Volume Calculations
Storage Volume Required 0.15(TV) =0.15 * 1911 �-- 287 CF
,Storage Vol ume Provided 1200 * 0.5 = 600 CF
I z
1 —1 C11
�4
C()
0
C/)
(D
E
0
LLJ
W
T_
SHEET NO.
C
5
2
SHEET
3 of- 9