HomeMy WebLinkAboutWPO201700016 Plan - As-built 2022-02-14BMP AS -BUILT PLAN FOR
LEGEND OLD TRAIL BLOCKS 55 205 * 21
EXIST NEW DESCRIPTION
16'TG x 125TC TOP OF CURB ELEVATION
165 x 125 SPOT ELEVATION
165TW x 12'TW TOP OF WALL ELEVATION
16'6W X 125BW BOTTOM OF WALL ELEVATION
BENCHMARK
STORM SEWER
-RD —+o ROOF DRAIN
SEWER LINE
s"w 6"w WATER LINE
GAS GAS GAS LINE
SHE SHE OVERHEAD ELECTRIC WIRE
sE nce UNDERGROUND ELECTRIC
oHr oHT OVERHEAD TELEPHONE LINE
cT DST UNDERGROUND TELEPHONE LINE
— DRAIN INLET (DI)
OO 0 STORM/SANITARY MANHOLE
PLUG
wv wv WATER VALVE & BOX
FIRE HYDRANT
CK M lxx a WATER METER
�� ♦� LIGHT POLE
f UTILITY POLE
PROPERTY LINE
ADJACENT PROPERTY LINE
VACATED PROPERTY LINE
BUILDING SETBACK
PARKING SETBACK
SANITARY EASEMENT
--'"— GRADING EASEMENT
DRAINAGE EASEMENT
UTILITY EASEMENT
WATER EASEMENT
ACCESS EASEMENT
STORM DRAINAGE EASEMENT
TREE LINE
FENCE
STREAM
312—
— 12 —
INTERVAL CONTOUR
300—
—0o—
INDEX CONTOUR
CG-2
CG-2
STANDARD 6" CURB
CG-6
CG-6
COMBINATION 6" CURB & GUTTER
CONCRETE PAVEMENT / SIDEWALK
RIPRAP
ASPHALT
GRASS
EC-2 MATTING
EC-3 MATTING
WETLAND
10
10
PARKING COUNT
—
CROSSWALK
HANDICAP ACCESSIBLE AISLE
/F—N
CG-12
HANDICAP PARKING
NOTE:
1. THE SIZE OF THE SYMBOLS MAY VARY FROM WHAT IS SHOWN.
TMP 055EO-0 I -A I -000AO
WF02017-0001 G
WHITE HALL DISTRICT, ALBEMARLE COUNTY, VIRGINIA
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SHEET INDEX
- COVER SKEET
- AS -BUILT PLAN OVERVIEW
- AS -BUILT BIOEILTER PROI=ILES
- AS -BUILT PIOEILTER PLAN VIEW
- AS -BUILT MITIGATION PLAN
OWNER / DEVELOPER
Owner: Denstock Old Trail, LLC
1430 Rolkin Ct. Suite 301
Charlottesville, VA 22911
Developer: Denico Development Co.
1430 Rolkin Court, Suite #301
Charlottesville, VA 22911
LEGAL REFERENCE
TMP 055EO-01-00-000A1 — DB 4945 PG 404C
— DB 5016 PG 134-147
(Plat)
— DB 5028 PG 62
ZONING
rood Model District
(For Portion of Parcel Subject To Site Plan)
Entrance Corridor Overlay
Original Approved ZMA 2004-024
N Amended ZMA 2008-05
ed 7�'
SOURCE OF
BOUNDARY & TOPO
u�,io iy �tldey i i,cC�i i „vic�c y:
Roudabush, Gale, & Associates Inc.
914 Monticello Road, Charlottesville, VA 22902
(434) 977-0205
Boundaries shown on on unrecorded plat based on
the proposed
Blocks 5, 20, & 21 subdivision dated 07/20/2016,
revised
10/04/2016
Topographic survey provided by:
Roudabush, Gale, & Associates, Inc.
Date Completed: 08/16/2012
Curb and Gutter Survey and Field Verification
Completed on 05/03/2016
Proposed development will be subdivided from TMP
55E-01—A1.
Asbuilt Survey provided by:
Shimp Engineering, P.C. on: November 17th, 2020
Additional Survey provided by:
Shimp Engineering, P.C. on: June 29th, 2021
A title report was not provided. All easements and encumbrances
may not be shown or ' s plan.
BENCHMARK
NAVi)
BMP MAINTENANCE SCHEDULE
ONSITE BMPS:
Bioretention Filter Basins (biofilters)
Biofilters are sized per Virginia Stormwater Management Regulations Part IIC.
All BMP are to be owned and maintained by the Old Trail HOA.
All BMP outlet to wetlands at compliant runoff rates.
Total Area treated by BMPs: 6.58 Acres.
BIOFILTER MAINTENANCE:
Maintenance Tasks
Frequency
• Sot weeding, erosion repair, trash removal, and mulch ralking
Twice during growing season
• Add reinforcement planting to maintain desired the vegetation
density
• Remove invasive plants using recommended control methods
As needed
• Stabilize the contributing drainage area to prevent erosion
• Spring inspection and cleanup
• Supplement mulch to maintain a 3 inch layer
Annually
• Prune trees and shrubs
• Remove sediment Dints in re -treatment cells and inflow
Once every 2 to 3 years
• Re lace the mulch layer
Every 3 years
All primary spillways (outlet risers) should be inspected quarterly. Remove any sediment and
debris buildup within filters and risers quarterly and after heavy storm events. Cleanouts shall
be used to unclog underdrains and remove sediment buildup from the system.
APPROVED
by the Albemarle County
Community
Devel en Department
Date
22
File WP0201700016
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30 0 30 60 90 __-------- --- _ PG 13� �/' / �/ \\ /\// + / / j .' '-- _ It .i .. 08/10/2021
' ! w♦ 1 BIOFILTER E OUTLET Scale
Scale: 1"=30'p /' / /' /�
"=
C2 Scale: 1"=40' 1 40'
Sheet No.
File No.
-- 16.020
670
665
660
655
650
645
680
675
670
665
660
655
650
64
reel
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9+50
665
660
655
650
645
640
63
680
675
670
665
660
655
650
64
10+00 0+T1+00
ST6-OUT3 STORM PROFILE
C3 HOR: 1"=30, VERT: 1"=10'
OUT10 OUTS
665
660
655
650
645
640
9+50 10+00 10+50 11+0035
2 OUT9-OUT10 STORM PROFILE
C3 )HOR: 1"=30, VERT: 1"=10'
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9+00 9+50 10+00 10+50
1 3 OUT6-OUT'7 STORM PROFILE
\ C3 )HOR: 1"=30, VERT: 1"=10'
695
690
685
680
675
670
665
66
670
665
660
655
650
645
695
690
685
680
675
670
p g665
0
9+50 10+00 10+50 11+00 11+506
OUT1A-EX1 STORM PROFILE
C3 HOR: 1"=30, VERT: 1"=10'
MIA
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690
685
680
675
670
665
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9+50 10+00 10+50 11+0
BIOFILTER A PROFILE
C3 HOR: 1"=30, VERT: 1"=10'
685
680
675
670
665
660
655
685
680
675
670
665
660�A
655
65�+50
"" HDPE Pipe w.
domed grate
Top=668.21
MAX WSE _
671.54 \
- - -
1= =
665.21
1-�o-more
662.21
No. 3 Ston-e
Layer: 611 sf 4" Perf. PVC
x 3' Depth ®662.36
18" HDPE in
10+00 from Filter B
® 659.29
6 BIOFILTER
1
C3)HOR: 1"=30, VERT: 1"=10'
48" Precast Conc. 685
Riser w. Trash Rack
Rim=669.26 680
Riney w- Fes9 Reek
_ __ 675
GHPST 6411.8 CREST 671.50
670
2_1 BeryFp
Filter Media: 611sf x
2.5' Depth
660
B u,.��
668.88 655
N 30" HDPE Out
®659.14 gg
10+50 11+0050
C PROFILE
680
675
670
665
660
655
650
645
64�+50
10+00
10+50
BIOFILTER
B
11+00
PROFILE
17�
C3
HOR: 1"=30, VERT:
1"=10'
24" Nyloplast Pipe
w. domed grate
Top=662.43
661.93
658.93
655.93
10+00 10+50
� BIOFILTER D PROFILE
C3 HOR: 1"=30, VERT: 1"=10'
11+50
685
680
675
j OF
�Cr
O � �
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680
A 2�9� �1
48" Precast Conc.Riser
Pash p
��SSI�NAL
w.
Rack Rim=r662.68
675
670
CREST 664.27
Filter Media:
1898 sf x
Uj
3.0' Depth
w`l
660
L
-
655
o
0
+o" unn�
n..�
650
W
�•
-
AN®
Ail
18" HDPE
Out
o
J
J
655.83
645
N
ri
D �D
IS-1Q
Q
1+00
gg
11+5040
670
670
24" HDPE Pipe w.
48" Precast Conc.
665
domed grate
Riser w. Trash
665
Top=654.10
Rack Rim=655.94
660
Pipe
W.
48" ee64 G.III
R _
660
-
-m54.2
489
CREST
658.07
655
MAX
WSE_ _
�
655
AS -BUILT BMP NARRATIVE:
653.60
ill
_
I-III-III-ITI-III-III
III
650
650.60
Filter Media:
_ _ _
Upon initial as -built survey and inspection of the Biofilters, it was determined that all of
648.10
h
2457 sf x
the Biofilters where not installed per the approved plans and several significant
---- z
""""""
3.0' Depth
discrepancies were found. Biofilters B & C were excavated to bottom elevations well below
645
n
�'"
5
those proposed in the approved plans. All standpipes and overflow structures were installed"o
6
-ro c va
at elevations not consistent with the approved plans, nor in appropriate relation to the
64S.99
bottom of pond elevations. Media depths were found to be inadequate for all Biofilters.
640
No. 3 Stone
6"
Perf. PVC
18" HDPE Out
640
Layer: 2457 sf
0
648.54
0 647.76
Shimp Engineering utilized the as -built survey data to determine the appropriate revisions
-
x 2.5' Depth
required to each individual BMP in order bring each into compliance and to meet the
635
635
approved stormwater treatment and runoff rates. The as -built conditions were modeled in
Q?
rn
Yi
_
HydroCAD and new models were created to determine appropriate elevations based on
'Co
existing conditions. Shimp Engineering provided the contractor with revised elevations,
639
`0
(
CIOgg30
inverts, structure heights and material depths to correct the discrepancies. Shimp
+50
10+00
10+50
11+00
11+50
Engineering inspected and surveyed all changes made to the Biofilters and confirmed
appropriate elevations and adequate media depths for each BMP.
I I BIOFILTER
E PROFILE
C3 HOR: 1"=30, VERT: 1"=10'
Ln
U�
i
1 I_001
C4 SCALE: 1 °'-
U) 1
24" NYLOPI
DRAIN W/Gf
48"STANDPIPI
RET • WALL
6„X6" 85 TIMBE621
TOP• /
— o �LH��) A i \ Bed Surface 4. �r
BIOFILTER E �_ _ — — - �� 1898 sf
J ELEV: 661.93
24" NYLOPLAST V) m (Wi
DRAIN W/GRATE TREE _ xO \ /
/ — _
SNP) ,/
I / BUSH
SEGMENTEDBL
OCK6" Capped TYP T. \ PVC c/o BW=662.30
6Capped Bed Surface
TW=664.27
PVC c/o 2457 sf — \
2 / ELEV: 653.60 \ 0 \ \ _ 48"STANDPIPE
0 0 J — POND BERM 24" NYLOPLAST
\ ELEV 658.07 DRAIN W/GRATE
68.9'
ij \0 \ \ \ / CLASS Al /
BUSH
�>
/ ' � � bijr'I>J'i`>L;R D PLAN VIEWTYP
6 PVC UNDERDRAIN ( ) / C4 scALE: i"- n'
�OQ RIP -RAP / do -
�� / CLASS Al �� �`�� CURB RIP -RAP
CLASS Al
/
4 � CUT
ew L C t
RUSH
3 � BIOFILTER E PLAN VIEW
C4 SCALE: 1"-10'
Biofilter
Planting
Plan:
Required
Planting:
Per VA Type
IIC Regulations: between
10 and 23 plantings per 1000 sf biofilter surface
Provided
Planting:
12 plantings
per 1000
sf of biofilter
surface Planting mix=3:1 or 2:1 shrub:tree ratio
Biofilter
A:
Biofilter B: Bed Size= 2960 sf
R_-' _qn__
nnc _1
Bed Size= 472 sf
Bed Size—"�s;
Required Plantings-32 PlanGnga=32
Required
Prevrd.,d--Plst7ttrgs.
Plantings-7
plantinga=7
T�ecs zta` s
Pra'.idcd Plat 9^ �` _�� s: Trees— 8 Sh r sTr
Biofilter
C:
Bed Size= 611 sf
Biofilter D: Bed Size= 1898 sf
Required
=
plantinga=4
Required Plantings =22 PlanGnga=24
P,ovided
Plantings.
— —
_ — 7
Biofilter
U
Bed Size 2457 sf
Total Biofilter Area: TOTAL Bed Size= 8398sf
T�-��T90 sf
Rr
' =
cJS:
rj Plontinga=28
TI Sh,vbs-1
Total Required Plantings=90 plantinga=93
T5t(J! Previded PIentings`�Y
O���PL,� OF�
U
ic.
imp a
o.45183
211ha
CIA
CIZONAL
�
ECG`
C5 )BIOF]LTER C PLANVIEW
C4 SCALE: 1"=10'
'/, '/, '/, X,, '/, X,, '/,
— Main Mitigation
_ . _ Planting Area
i
+ + + N0 Seedlings
+ + + + + + + + in San. Esmt.
+ + + + + + + + + +
+ + + + + + + + + + + +
\ I Secondary
Secondary / Mitigation
Mitigation Planting Area
Planting Area A •/ �.'
ED Sidewalk
Easement� J
T ``
+ + + + + + + + + + DB 5016 Planting Area,
♦ �. + + + Main Mitigation + + + + +
J +++ ++++++++ Planting Area' +.,++
+ + �: ",�' �• /. /
+ + + + + + + + +
i"
+ + + + + + + /
/ + + + + + y
/ + + + + + + +
+ + + + + + + + + + + + +
XT T + + + + + + + + + No Se
+ + + + + + + + + + Soy• ost- Construction
+ + + + + + + + '0Treeline
t I No Seedlin s +++ + + Secondary
--- - - -- aMitigation
bove an. 9 ./
�® - S / g Lott Planting Area
El ♦ I
+ ++++ +ffer
++ + SOream -
15+00 + + + + +
_ 100' Stream + +
Buffer 12+0\ 13+00 14+00 - + + + + + +
0 •,
11+oa -- — --- + + +
+ +
+++
+ + + +T+T+T++T+T+T+T+T+T+ + + +
+ + + + + + + Main Mitigation + + + + + + +
+++++++++++++++Planting Area + + +
+ + + + - -
+ + + -
OLD TRAIL DRIVE
VARIABLE WIDTH PUBLIC ROW
DB 2886 PC 134 — 155 (PLA1
0
1. Option I - Mitigate through new plantings and permanent protection as given
below. New plantings must be in the stream buffer area. Applicant has choice of
planting ruts of the following:
a. For every 40) square foot unit or fraction thereof. plant one (1) canopy tree
measuring 1 th" - 2" caliper or a large evergreen 6 feet in height. one (!1
taukrstorr Tree measuring 3A" - I %4 caliper or one evergreen 4 fat in height.
and one (1) stnall shnth I S" - 18" in height.
b. For every acre or fraction thereof. plant 1.210 hardwtm4 and/or pine seedlings
on approximately 6'X6' centers without tree tubes and mats.
c. For every acre or fraction thereof. plant 600 hardivood and/or piny wedlings
on approximately 8'X8' centers with tree tubes and mats.
2. Option 2 - Mitigate by preserving existing buffer where currently not required by
ordinance: i.e. preserve stream buffers on intermittent streams in the development
areas. Mitigation must be accomplished by permanent protections as given
below.
Permanent Protection for each of these options will be inclusion in the Thomas
Jefferson Soil and Water Conservation District (T)SWCD) Easement Program, or
recordation of a permanent maintenance agreement and escrow to run with the
land.
0
Sidewalk -
Easement
Easement
DB 5016
PG 134
BUFFER AREA DISTURBED:
1.79 ACRES WITHIN 100' BUFFER
MITIGATION OPTION 1 B REQUIREMENTS:
2166 HARDWOOD AND PINE SEEDLINGS ON 6'x6'
CENTERS WITHOUT TREE TUBES OR MATS
MITIGATION PLANTING CALCULATIONS
77,561 SF Disturbed Stream Buffer
155,122 SF 1:2 Ratio Suggested Replanting Area
39,354 SF Available Replanting Area
548 SEEDLINGS
Available Replanting Area denoted main planting
area) Shall Have GAO S__�':i-'.;_=. The remaining
1618 Seedlings shall be planted within the
existing undisturbed forest within the stream
buffer and in unused areas within the site
(shown as solid grey hatch). No seedlings shall
be planted within ACSA Sanitary Easements.
LEGEND
MITIGATION REPLANTING (MAIN AREA) + + +
E+ +
MITIGATION REPLANTING (SECONDARY AREA)
WETLANDS
STREAM BUFFER-_�'"^'l
TREE PROTECTION FENCING-��
+ + + + + +
+ + + +amain Mitigation
+ + + + Planting Area �t
+ + + + + + + + + + +
+ + + + + + + + + + + + + + + + + +
+ + + + + + + + + + + + + +
+ + +
+ + + + + + + + + + + + +
I + + + + + +
rainage + + + + + +
Easeme + + + + + + + + '
16 + + + + + + + + + r ' ge Secondary
+ +PG+134+ + + + + + + + Easement Mitigation •'/'
I �
100Stream
Buffer
+ + + + + I /
+ + + + + + etlands -
+++++
++++++++++++ Secondary
++++++++++ Mitigation /
+ + + + + + Planting Area /• /'
+ + + + + +
Post- Construcion /
Treeline _ •.
Son. —
A
Easement �
San. MH
typ.) I
NO
0
r
CSA'San.__Z#
as +
J
✓ /
� 40 0 40
Scale: 1"= 40'
/
/
80 120
Mitigation Planting Schedule
Planting
Type
Botanical Name
Common Name
Planting Details
Quantity
Hardwood
Seedling
Quercus falcato
Southern Red Oak
6'x6' on Center
541
Hardwood
Seedling
Acer rubrum & cvs.
Red (Swamp) Maple
6'x6' on Center
542
Evergreen
Seedling
Pinus strobus
Eastern White Pine
6'x6' on Center
541
Evergreen
Seedling
Picea Abies
Norway Spruce
6'x6' on Center
542
Total:
2166
Note: Species can be substituted from
Albemarle County
Approved
Planting List. Contractor
shall begin planting after earthwork is
finished and shall
complete
plantings within 6 months.
Seedlings shall be planted according to
best practices as
specified
by the USDA.
N
0
m
N
N
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F_
aw
J
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c
Qo
W J
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m a
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V219M��
��`S'SIONAL ti�G1
Date
08/10 2021
Scale
1 "=10'
Sheet No.
C5 OF 5
File No.
16.020