HomeMy WebLinkAboutWPO201400067 Plan - As-built 2021-12-22r
6-4
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395
0+00 0+50
1 STORM SEWER PROFILE A
—5 HORZ SCALE: 1" = 30'
VERT SCALE: 1" = 10'
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X 454 —
453
Tap of Berm
EIev=455.0
Existing Structure 4
See Note 3
BIOPLE NTION-LEVEL 2 DETAIL
SCALE: 1 "=5'
Filter Media
EIev=453.0
Sand 452.5
Depth = 2"
VDOT #57 1#8 washed gravel
Underdrain Depth = 2"
55
Cleanout and
Impermeable N 6" Perforated
Geotextile SCH40 PVC
Fabric Pipe at 1.0%
Slope
54
Diaphragm Level
Spreader
ML A
Pre —Treatment
Pre —Treatment A
be seeded and n
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TIMOTHY RAY MILLER >
465 Lic. No. 2065 ?
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9N� SURv�y�e`�
455
BIORETENTION AS -BUILT SURVEY WAS
PERFORMED BY:
MERIDIAN
445 PLANNING GROUP, LLC
440 Premier Circle, Suite 200
Charlottesville, VA 22901
(P) 434.882.0121
435
DATE: AUGUST 6, 2018
REV: DECEMBER 22, 2021
425
415 465
405 455
395
6+50
445 LNew 8'-15"RCP
0+00 0+5C
2 STORM SEWER PROFILE B
—50 HORZ SCALE: 1" = 30'
VERT SCALE: 1" = 10'
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NOTES:
1. Bioretention shall be installed in compliance with VA
DEQ Stormwater Design Specification No. 9.
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2. Filter media shall consist of the following:
87% sand;
8% soil fines;
5% organic matter;
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3. Existing Structure 4 shall be modified to become the
outfall structure for the new Bioretention. Remove
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ur
existing top and replace with riser section that has
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the following:
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a. 6"wide x 3" tall weir, elevation=453.50 453.21
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0
b. Riser crest elevation = 454.00 453.71
c. Antivortex device.
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BIORETEN11ON
LANDSCAPING
Key
Name
Species
Quantity
Minimum Size
P-1
Switch Gross
panicum virgatum
100
P-2
Cardinal Flower
Lobelia cordinolis
100
S-1
Common
Winterbemy
ilex verticillatta
40
30" Height
S-2
Wax Myrtle
Myrico cerifera
40
30" Height
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454 1. Perennials, shrubs and switchgrass shall be evenly
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distributed across filter media.
SWM MAINETNANCE & ACCESS EASEMENT
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WAS RECORDED IN DB 5619-737. 188 SHRUBS OBSERVED
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0 DENOTES AS —BUILT CONDITIONS
1
A
' 0.0'
r--2' Gravel Diaphragm
Flow Spreader
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l
SECTION VIEW
Pretreatment Cell
EIev = 453.0
452.9
APPROVED
by the Albemarle County
Community Development Department
Date 02/22/2022
File WP02014-00067
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Bioretention Area Calculations C W
Area Required =(1.25 *Tv)/Storage Depth
= (1.25 * 1911)/2.05= 1165 SF
Area Provided = 60* 20 = 1200SF
TV= 1911CF
PondingVr= 1.00
Media Vr= 0.25
Gravel Vr= 0.40
Storage Depth= (0.5*1)+(3*0.25)+(2*0.4) = 2.OS FT
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SHEET NO
Pre -Treatment Cell -Volume Calculations C-5 02
Storage Volume Required = 0.15(TV) =0.15 * 1911= 287CF
Storage Volume Provided=1200*0.5=600CF SHFFT 3 Of 9