HomeMy WebLinkAboutWPO201500004 Plan - As-built WPO VSMP 2017-05-02OWNER:
061A0-09-00-02900
CA THOLIC DIOCESE OF RICHMOND
1800 CAROUSEL LANE
RICHMOND, VA 23294
ENGINEER:
COLLINS ENGINEERING
200 GARRETT ST. SUITE K,
CHARLOTTESVILLE VA 22902
TELEPHONE.` (4311)29.33719
FAX:
(434)293 2813
CONTACT` MR. SCOTT COLLINS, P.E.
E-MAIL:
scott@collies en gin eering.com
TAX MAP NO.:
061A000-0002900 (D.B. 1802/ PG. 311)
AREA:
17.09 AC.
ZONING:
R— 4 RESIDEN T lAL (UNDER SPECIAL USE PERMIT SP— 98— 6 7)
U✓A TERSHED:
MEADOW CREEK WATERSHED
TOPO & SURVEY:
TOPOGRAPHY AND BOUNDARY PROVIDED BY LICENSED LAND
SURVEYOR COMMONWEALTH LAND SURVEYING IN DECEMBER,
2016. NAD 83
FLOODPLAIN: FEv1A MAP NO: 51003C 0287D, DATE: 2/4/05
NOTE: THIS PROJECT IS NOT LOCATED WITHIN FLOODPLAIN
LIMI IS.
STORMWATE4 MANAGEMENT: A LEVEL I BIORETENTION BASIN WILL PROVIDE WATER
QUALITY TREATMENT FOR THIS PHASE OF THE DEVELOPMENT.
AN EXISTING DOWNSTREAM DETENTION FACILITY WILL REMAIN
AND WILL PROVIDE WATER !QUANTITY TREATMENT FOR THIS
POR TION OF THE SI TE.
VICINITY MAP
SCALE: III = 21000,
LT *MWATER MANAGEMEI\JT mFLA1m\jm
ASBUI STO Krm"
SYM
BOTANICAL
COMMON NAME
SWM FACILITY
QUANTITY
PERENNIALS/HERBACEOUS
SC
SCIRPUS CYPERINUS
WOOLGRASS
(75) 1 qt. Wool Grass, V o.c.
.JC
JUNIPERUS CHINENSIS & CVS.
CHINESEJUNIPER
(46) 3gal. Juniper, 4' o.c.
PV
PANICUM VIRGATUM
SWITCHGRASS
(26) 1gal. Switchgrass, 18" O.C.
SHRUBS
IV
ILEX VERTICILLATA
WINTER BERRY
3
CA
CLETHRA ALNIFOLIA
RUBY SPICE SUMMERSWEET
9
TREES
BN
BETULA NIGRA
RIVER BIRCH
1
AR
ACER RUBRUM
RED MAPLE
1
LS
LIQUIDAMBAR STYRACIFLUA
SWEETGUM
2
RIU` MAGISTERIAL DISTRICT
AL3030"EMARLE COUNTY, VIRGIN /-k
10 WIDE T EAR HEN GRADED
SWM ACCESS ROAD`
BIORETENTION BASIN FOREBAY
` VOLUME REO'D= 584 cf --�,
(797 cf PROVIDED)',
, ,:
5' WIDE FOREBAY TOP OF DAM''.
ELEVATION=418'
M
P
u V (26) ..
M BIORETEN
, MIN. EsA51N FLOOR
LS {�) IV (3) AREA REC2'D=1,8o6 sf
(1,997 sf PROVIDED)
6" SCHEDULE 40 PERFORATED PVC
7� \ CLEANOUT (TYP.)
i=_�\ BN {i}
i
0 1: SEE DETAIL ON THIS SHEET
UNDERDRAINS, INSTALLED'
u AR (1)
THROUGHOUT THE LOWER STONE LAYER.—
IDS-
' BUILT MULCH
M LINE (TYP.)
i� 6" SCHEDULE 40 SOLID PVC
`
, : 1 ✓ OUTLET
.. O
SC (7.5)
1o' WIDE LEVEL EMBANKMENT
u 77-
FOR ACCESS TO SPILLWAY
t��' SWM ACCESS & MAINTENANCE EASEMENT s.
CAS y
,
{
y
20' WIDE GRASS LINED EMERGENCY
SPILLWAY w/ 4:1 SIDE SLOPES
& RIPRAP OUTFALL
CREST ELEVATION = 417'
VDOT STD. CL. I EC-2
f
RIPRAP OUTFALL
r.
p
;
PROPERTY LIMITS
BIORETENTION BASIN'A' DESIGN REQUIREMENTS & AS-BU ILT CONDITIONS:
Treatment Volume (Per VRRM Calculations) 3,893 cf
Minimum Treatment Volume Required 3,893 cf
Minimum Forebay Volume Required (15%of Tv) 584 cf
As -Built Forebay Volume Provided 797 cf
* Minimum Surface Area Required (Tv/Storage Depth) 1,806 sf
As -Built Surface Area Provided 1,997 sf
* Area based off T Mix at 25% porosity, 3" pea gravel at 2% porosity, 12" stone at
40% porosity & 12" of ponding at 100% porosity
STORMWATER
MANAGEMENT
FACILITY GRADING
As -Built Area of
Elevation
Forebay Cell
Volume
(ft)
Contours (sf)
(cf)
414
32
0
415
121
72
416
184
223
417
283
455
418
404
797
Elevation
(ft)
As -Built Area
of Filter Cell
Contours (sf)
Volume
(cf)
411.5
1,997
0
412
1,997
998
N
413
1,997
2,996
414
1,997
4,992
415
1,997
6,989
x
416
1,997
8,986
Q)
417
2,316
� s=
o
418
2,734
0-
Existing
Elevation
Detention Area
Volume
(ft)
Contours (sf)
(cf)
408
1,366
0
410
2,653
3,948
411
3,686
7,104
412
4,768
11,319
PRCP -7.
)f j, wSL QiH-'—LID— 1
.�i
PEDAL V.. L: 0I3TJ BEZ r.L- FE:a CIHA L. EE _'74E'sL.ZEEC ry;`TH El--2 MA N ,G,.
`'.CLL E! `AA .; .::U..L r? iALL C01r 3Q CIF !JL a 2C CI G''C r,a fir x
f }xVI_c.L R;ADr-v. ,,_+%d:•5t .0', C. a 4u,i-.- _r T'H-E i,d`.J1•�.. _r45vx ':" rk i-. ,ems- CQ„i(i!�Y'�C EU-�2L.�y��i,tu`-i,�`LL SH
tl 'LE,_7 E: :. B_S d:i.. .{i 4�i ��',.1 t... ..'-H .,.,OFF , .., .A, OR' DEN, '�� . �_:F L'.�55% .-,F .';'4 i,.., !a ,; ..e...p x��1]
h4l..S
Perforated asr
Figure - . , T�, � 3fofetenkm Bashi Besm
SJ C;TTC A-9: TYP14C_ C,; HIC'A_L DETAIL
HQMQgCrkgQ as fill
r , •,`.,. 4a min
trenc —4' below S ON4_ 1
a rna-Iericl
TYPICAL HOMOGENEOUS
EMBANKMENT
f K
FOUNDATION DRAIN
,,'VI E!PMGf-T CA
ON TE1 tir11(�I:AI:_ ENID
F PIPE
dvyin
Odin
P"
=�Tr�rr��tri f€li�s-
HIMNEY DRAIN
Iran it fill
__Rock: or gravel
'-EIiarikeI drain
BLANKET DRAIN
R000, or lgerlyAd
---Tr,pna1tiort filter
1O RAIN
4° P_ 4CNC;":IzJPERFORLATE'G
r`5 r;2,z C1 F IP.—
Figure 9-B. t. 4" P.V.C. Cleanout Detail
O SCOTT R. COLLINSZ"
,C-) Lic. No. 035791,E
o
��SSroNAL