HomeMy WebLinkAboutWPO201200049 Plan - As-built 2022-03-0325 0 25 50 75
SCALE: 1 "=25'
6" PVC
INV = 650.55'
AS -BUILT 11310-FILTER ELEVATIONS
EAST
WEST
BERM
657'
657'
WEIR
655'
654'
MEDIA
654 '
654'
MEDIA AREA
1883s.f.
2334s.f.
VOLUME
2,217c,f,
2,822c.f.
NOTES:
660
��- N L T H F
TIMO HY RAY MILLER n
Lic. No. 2065
S12 S�ZI
�SUR�_
00/
11011
Ln
11101
110.1
24" CMP
INV = 647.54' \
r �
660
6" PVC
INV = 649.59'
" PVC
4" PVC
INV = 654.72'
TFE TOTAL NEW IMPERVIOUS AREA FROM TIE NEW ENTEF7,10E-71.625 SF
T1£ EXISTING IMPERVIOUS AREA SLATED TO BE REMOVED-30-9% SF
NET NEW IMPERVIOUS AREA TO TREAT-41,030 SF
TOTAL BASE AREA REOUIPEO FOR BIG-FILTERS-2.5% x 4030 SF-LO25 SF
TOTAL RONOFF VOLLIE REQUIRED TO RETAINED Ti-E FIRST 1'-41,030/12-1419 CF
TWO SIO-FILTERS ARE PROPOSED ON EITHER SIDE OF THE STREAM JUST BELOW TFE EXISTING LILLY POND.
EACH BIOfILTER TO BE SIZED IN PROPORTION TO IT'S TOTAL DRAINAGE AREA.
T}E TOTAL DRAINAGE AREA OF TT£ BASIN (AS MEASURED FROM AT INLET TO TI# CLLVERT CROSSING LIDER TW LOOP ROAD AT STATION 36r84.11.40 AWES
TMf AREA EAST OF THE STREAM ABOVE THE CULVERT IS 41% OF TFE TOTAL 11.40 ACRES,
Tff AREA WEST OF TW STREAM ABOVE TW CLIVERT IS 59% OF T)f TOTAL 11.40 ACRES.
WEST BIG -FILTER EAST BIG -FILTER
THE FEQUIRED BASE AREA OF THE WEST BIO-FILTER IS 59% OF 1.025 SF-605 SF.
TfE
REQUIRED
BASE AREA OF THE EAST UIO-FILTCR IS 41% OF 025 SF-420 SF.
T?f PROVIDED BASE AREA-100' x 18' -I-BOO SF
THE
PROVIDED
BASE AREA-105' x 10'-1,050 SF. —
Ttf REQUIRED VOLUME OF Tff WEST 610-FILTER IS 591 OF 3.419 CF-2,017 CF.
T1£
REQUIREO
VOLLK W THE EAST 810-FILTER IS 41% OF 3,419 CF-1,402 CF'.
I
THE PROVIDED VOLUME-2,172 CF AT ELEVATION 654,00. -
'THE
PROVIDED
VOLUME' L413 CF AT ELEVATION 654.00.
112" PVC
INV = R
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116
90
636
4,246
CLEANOUT
6" PVC
PLAN
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April 13, 2013
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1.776
2.173
3,388
117 22
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SILT TRAP RETROFIT TO BIG —FILTER
I,v ur,tr¢tor "I] rake 0-]i of the D10111ter
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1. This As —Built survey is limited to Bio—retention basins shown on plans generated by Hazen and Sawyer and titled "THE
MILLER SCHOOL —NEW ENTRANCE" dated June 9, 2014
2. This As —Built survey was prepared to show existing features as of May 13, 2021.
3. Pipe material types are determined by field observation to the best of our ability. Meridian Planning Group does not warrant
the material type of pipes located in confined or inaccessible spaces. APPROVED
by the Albemarle County
4. No underground utilities are shown as part of this As —Built survey. Community Development Department
Date 2/22/22
5. The As —Built topography and physical features shown on this map were obtained under the direct and responsible charge and File XW0911900049
supervision Tim Miller, License No. 2065, from an actual field survey. F