HomeMy WebLinkAboutWPO201700005 Plan - As-built Stormwater Management Plan 2020-01-30LEGEND
YD YARD DRAIN
SDMH STORM DRAIN MANHOLE
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SCOTTSVILLE DISTRICT ALBEMARLE COUNTY, VIRGINIA
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TIMBERLAND PARK APMTS
OLD LYNCHBURG ROAD
SDP2017-16 & WP02017-05
SCOTTSVILLE DISTRICT
ALBEMARLE COUNTY
SHEET: 1 of 5
DATE: JANUARY 30, 2020
FILE: TIMBERLAND PARK -STORM AB.DWG
SHEET INDEX
AB-100 ........ COVERSHEET
AB-200 ........ SITE PLAN
AB-300 ....... STORM PROFILES
AB-400 ........ STORM PROFILES
AB-500 ........ STORM PROFILES
APPROVED
by the Albemarle County
Commune ge�r�l8p�rbent Department
Date //
File WP0201700005
CONSTRUCTION CERTIFICATION:
"I CERTIFY THAT THE CONSTRUCTION OF ALL
STORMWATER MANAGEMENT FACILITIES INCLUDING
DRAINAGE AREAS COMPLIES WITH THE APPROVED
CONSTRCUTION PLANS AND WILL FUNCTION AS
DESIGNED."
LT H of
--\
D. Kent O'Donohue, Jr a
Lie. No. 1683
02-04-2020
o��� N t T k of/
TIM TliY RAY MILLER
tic. No. P65
r
STORM AS -BUILT SURVEY
PERFORMED BY:
MERIDIAN
PLANNING GROUP, LLC
440 Premier Circle, Suite 200
Charlottesville, VA 22901
(P) 434.882.0121
MAINTENANCE SCHEDULE FOR BIORETENTION
Description
Method
Frequency
Time of Year
SOIL
Inspect and repair erosion
Visually
Monthly
monthly
ORGANIC LAYER.
Remulch any void areas
By hand
Whenever
Whenever
needed
needed
Remove previous mulch
B hand
y
Once every two
s rin
p g
before applying new layer
to three ears
Any additional mulch
By hand
Once a year
spring
added (optional)
PLANTS
See planting
Removal and replacement
specifications of the
Mar. 15 to
of all dead and diseased
Virginia Stormwater
Twice a year
Apr. 30 and
vegetation considered
Management
Oct. 1 to Nov.
beyond treatment
Handbook, Section
30
3.11
Varies,
Treat all diseased trees and
depends on
shrubs
Mechanical or by hand
NIA
insect or
disease
infestation
Watering of plant material
shall take place at the end
Immediately
of each day for fourteen
By hand
after
NIA
consecutive days after
completion of
planting has been
project
completed
Replace stakes after one
Only remove
By hand.
Once a year
stakes in
year
spring
Replace any deficient
By hand
NIA
Whenever
stakes or wires
needed
Check for accumulated
By hand
Monthly
monthly
sediments
1. Inspect bi-annually and after each storm event the contributing drainage areas, Bioretention facility,
inlets, outlets, underdrains, overflows and cleanouts for debris, sediment, proper drainage and damages.
Clean and dispose of all debris, trash and sediment properly. Should structural damages be encountered
contact design engineer for replacement information and notify the County of Augusta Engineer of the
damages and proposed repair procedures.
2. The observation well shall be checked quarterly and after each large storm, event. A log book shall be
maintained showing the depth of water in the well during each inspection in order to determine the rate
at which the facility dewaters after runoff producing storm events. Once the performance characteristics
of the structure have been verified, the monitoring schedule can be reduced to an annual basis, unless
the performance data suggests that a more frequent schedule is required. At the end of the first year the
Landowner shall provide a copy of the log book and the revised monitoring schedule to the county
engineering department to be reviewed by the Erosion and Sediment control inspector. The inspector
will approve the revised monitoring schedule or require further inspections that shall be carried out by
the Landowner.
3. Inspect plant material bi-annually. Address any problems found due to disease or insect infestations.
Diseased plants must be treated by a qualified professional. Replace any dead plant material and prune
as necessary. Consult a landscape architect or horticulturist for specific pruning measures. All
replacement plants shall meet original design specifications. New plants shall be watered everyday for
the first 14 days after planting.
4. Conduct organic layer and soil tests twice a year to maintain proper pH. An application of alkaline,
such as limestone, shall be applied as needed per test results.
5. The soil mix shall be tested annually to check for the presence of toxins and heavy metals. If levels are
high and the plant biologic functions are impaired (dwarfed growth and mortality) the contaminated
soil and any dead plants shall be removed and replaced. All removed material shall be disposed of
properly. In some cases, the removal and disposal of the entire soil base as well as the plant material
may be required. Replacement soil mix and plants shall meet original design specifications.
6. Inspect mulch layer for voids and to ensure specified thickness. Replacement of mulch layer is required
every two to three years. Mulch shall be replaced in spring. The previous layer shall be removed first.
7. When sand or other street abrasives are used on areas draining to Bioretention basin during snow and
icing conditions the pavement shall be power/vacuum swept as soon as freezing weather abates to
prevent damage to the basins.
8. Inspect bi-annually all inlets structures, manholes, storm pipes, cleanouts and roof drains for proper
drainage and structural integrity. Should damages be encountered contact design engineer for
replacement information and notify County Engineering department of damages and repair procedures.
9. Inspect bi-annually all inlets structures, manholes, storm pipes, cleanouts and roof drains for debris and
sediment. Clean and dispose of all debris, trash and sediment properly.
STR # 17
18" N-12 HDPE
144.68 LF 0 0.48% SLOPE
STR #16, 60" MH-1
*INV= 410.06
409.94'
DAYLIGHT AT
EXISTING GRADE
(SEE PLAN)
BIORETENTION MEDIA REQUIREMENTS
GENERAL FILTER MEDIA COMPOSITION (SPECIFICATION NO. 9, SECTION 6.6):
THE RECOMMENDED BIORETENTION SOIL MIXTURE IS GENERALLY CLASSIFIED AS LOAMY SAND ON THE USDA
TEXTURE TRIANGLE, WITH THE FOLLOWING COMPOSITION:
85% TO 88% SAND;
8% TO 12% SOIL FINES; AND
• 3% TO 5% ORGANIC MATTER
IT MAY BE ADVISABLE TO START WITH AN OPEN -GRADED COARSE SAND MATERIAL AND PROPORTIONATELY MIX
IN TOPSOIL THAT WILL LIKELY CONTAIN ANYWHERE FROM 30% TO 50% SOIL FINES (SANDY LOAM, LOAMY
SAND) TO ACHIEVE THE DESIRED RATION OF SAND AND FINES, AN ADDITIONAL 3% TO 5% ORGANIC MATTER
CAN THEN BE ADDED. (THE EXACT COMPOSITION OF ORGANIC MATTER AND TOPSOIL MATERIAL WILL VARY,
MAKING PARTICLE SIZE DISTRIBUTION AND RECIPE FOR THE TOTAL SOIL MEDIA MIXTURE DIFFICULT TO DEFINE
IN ADVANCE OF EVALUATING THE AVAILABLE MATERIAL.)
FILTER MEDIA TESTING
f P-INDEX RANGE OF 10-30 OR BETWEEN 7 AND 21 MG/KG
• CECs EXCEEDING 10
*MEDIA MUST BE PROCURED FROM APPROVED FILTER MEDIA VENDOR.
*CERTIFICATION FROM MEDIA VENDOR MUST BE PROVIDED TO DESIGN PE/LA FOR SWM CERTIFICATION
PURPOSES. IF CERTIFICATION IS NOT PROVIDED THEN CONTR. WILL BE RESPONSIBLE FOR HAVING THE
MEDIA TESTED AND CONFIRMED THAT IT MEETS THE ABOVE REQUIREMENTS. THE RESULTS OF THIS TESTING
TOP= 416.39 417.29'
HT= 6.33'
MUST BE PROVIDED TO THE DESIGN PE/LA.
MANIFOLD FOR SECOND
36" DET. PIPE
9 n._VO Cl CVATInkl Irl
BIORETENTION DETAIL
N.T.S.
1310-RETENTION SCHEDULE Landscape Plants
Drainage
Impenvous
Required
Depth of
Stone
Bottom
Under
BMP
High Flow
High Flow
1-YR
10-Yr
Top of
Top of
Forebay
Area
Area
Media
Depth*. *.
of Stone
Drain Inv.
Surface
Weir Inv:
Weir
Elev.
Elev.
Berm
Berm
Weir
Large Trees
Area
Elev.
Elevation
Length
Width
Elevation
Elevation
KEY
ACS
ACS
SF
A
B
C
D
E
F
G
H
I
J
BMP #1
1.85
0.86
1,784
36"
40"
427.67
428.67
434.00
434.50
8'
434.24
435.30
4'
436.00
435.00
7
BMP #2
2.32
1.30
2,992
36"
28"
419
421.00
424.33
424.83
16,
424.84
425.79
4'
426.33
425.33
12
Including 3 Top Mulch Layer or SOD Layer
#57 Stone including 4" #8 Choker Layer
AS- BUILT 131O-RETENTION SCHEDULE
Required
Bottom
BMP
High
High Flow
Top of
Top of
Forebay
Drainage
Impervious
Depth of
Stone
Under
10-YR
Large
Media
of Stone
Surface
Flow
Weir
1-YR Elev
Berm
Berm
Weir
Area
Area
Media
Depth
Drain Inv.
Elev
Trees
Area
Elev
Elevation
Weirinv.
Length
Width
Elevation
Elevation
Key
ACS
ACS
SF
A
B
C
D
E
F
G
H
I
J
BMP #1
433.69
434.79
8
4
435.92
BMP #2
424.09
424.92
16
4.35
426.49
1 i
f 1
j t
I I
l I 128.53' @ 0.06%
l STR # 15
i 1 36" N-12 HDPE (2)
1 1 128.54 LF @ 0.20% SLOPE
DETENTION PIPE & WEIR PLATE DETAIL
N.T.S.
I U- i rC 7I UFIVI
412.14' @ 3 7 tFS
2-YR STORM
41 1 .58' @ 1,06 JS
STR #14, 60" MH-1
I
i
I
1
!
I
I
I
6"X6" NOTCH
MANIFOLD FOR SECOND -'
36" DET. PIPE 409.86'
*INV= 409.81
5" ORIFICE
INV= 409.81
414.65'
TOP= 414.68
HT� 4.87'
Y2" STEEL PLATE 48" WIDE
WITH 2" ANGLE IRON WELDED
TO SIDES AND FASTENED TO
MANHOLE WALL WITH EPDXIED
%" 0 STAINLESS STEEL
ANCHORS EVERY 6".
TOP OF WEIR= 411.81
100-YR= 412.45
ff STIR 7 # 13� 1.57%
l 18" N-12 HDPE
6.96 LF @ 0.867. SLOPE
INV= 409.81
409.76'
TO STR. # 13C UT
INV= 409.75
409.65'
*MOTE:
CONTR. TO ENSURE WATER TIGHT
CONNECTION WITHIN DETENTION FACILITY.
WEIR KEY
Weir Notch Notch
Length I Depth I Length
KEY A B C
BMP #1 8' 0.8' 3"
BMP #2 16' 1.0' 5"
AS-BUI
LT WEIR KEY
Weir
Length
Notch
Depth
Notch
Length
KEY
A
B
C
BMP #1
8'
0.65"
3.5"
BMP #2
16'
1.08'
6"
6»
6" GROUND LEVEL
FLOW
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TIMBERLAND PARK APMTS
OLD LYNCHBURG ROAD
SDP2017-16 & WP02017-05
SCOTTSVILLE DISTRICT
ALBEMARLE COUNTY
SHEET: 3 of 5
DATE: JANUARY 30, 2020
FILE: TIMBERLAND PARK -STORM
AB.DWG
E RIP -RAP
'--ATION IS
kS BEEN
URING
NEW RIP --RAP
OT SUFFICE) STORM AS -BUILT SURVEY
PERFORMED BY:
CLASS A3 CONCRETE W/ 6X6, W2.9XW2.9
WWF OR FIBER REINFORCEMENT
(4" MIN. THICKNESS)
HIGH FLOW CONC. WEIR DETAIL
MAINTENANCE SCHEDULE FOR SWM DETENTION
I,la inten an ceshall �e the respDnsibilityofthe a wnerupo n corn pletion of construction. Otiwnershall keep
record of all inspections and repair reports, forth e countyto review, onlyif req uested.
DESCRIPTION
METHOD
FREQUENCY
T NE OF TH E YEAR
SDIL
Inspect and Repair Erosion
V isua1; topsoiling and
Bi-annuall'j
B i-annu3IIt,
seeding I, existing grade
level Must he m3, 1nttain)
Check for accumulated
''visual! sediment to be
Bi-annually
Bi-3nnuaII.-
sediments
disposed of properly
GENERAL
Inspect and remove debns
Visuall trashy and
[J onth1,, or as
debris to be disposed
needed
of properly
PLANTS
Removal and replacement
Re -seed distressed
Twice a Year
115 to 1130 and 10.i1 to 111,30
of all dead and diseased
31'e3S
vegetation considered
beyond treatment
For arTy' further guidance or assistance please contact B aJ7 er & associates-54-248-3220
N.T.S..
1. Caution needs to be taken while inspecting the Stormwater
Management (SWM) facility; there is a hazard of soft saturated
sediment and soil.
2. The SWM facility shall be checked for sediment build-up. If sediment
build up reaches the cleanout level, the sediment shall be removed and
disposed of properly.
3. The SWM embankment shall be checked to ensure it is structurally
sound, has not been damaged by erosion, and has no trees or other deep
rooting plants growing on it. If damage appears to be evident contact
an engineer to inspect.
4. The emergency weir shall be checked to ensure its lining is well
established and erosion -resistant. If the emergency weir is no longer
established the weir shall be relined. If it is no longer erosion -resistant
the weir shall be relined.
5. The riser structure shall be checked to ensure it is structurally sound,
has not endured any damage and does not have excess sediment build
up. If the structure is found to be structurally unsound the entire
structure shall be replaced. If the structure is damaged repairs shall be
made immediately. If there is an excess of sediment in the riser
structure the sediment shall be removed and disposed of properly.
6. The culvert, leading from the riser structure and running underneath the
SWM embankment, shall be checked regularly to ensure it has not
endured any damage, is not being undermined, and does not have
excess sediment build up. If the structure has any damage the damage
shall be repaired immediately. If the structure is being undermined by
water an engineering investigation will need to be preformed on the
embankment. If an excess of sediment is present, the sediment shall be
removed and disposed of properly.
MERIDIAN
PLANNING GROUP, LLC
440 Premier Circle, Suite 200
Charlottesville, VA 22901
(P) 434.882.0121
o NLTH ON
i
Z
6 Illy THY RAY hlltl.ER a.
Lic. NO. {D65
SUF"E
SHEET
AB-300
STORM
2 PRO
T
FILE
■
1 1 470
■�}
1 1 450
1 1 440
1 1 430
1 1 420
1 1 410
1 1 450
1 1 440
1 1 430
1 1 420
1 1 410
■ A !
■ 0 0 Me;K
1I 380
9
STORM 13-20 PROFILE
UTILITY NOTES:
3.0' MIN.
COVER FOR
SANITARY.
3.5' MIN.
COVER FOR
WATER.
+ 1.5' MIN.
SEPARATION
BETWEEN
SANITARY
AND WATER.
1.0' MIN.
SEPARATION
BETWEEN
STORM AND WATER OR
SANITARY.
CONTRACTOR
TO FIELD
VERIFY
LOCATION
AND DEPTH
OF ALL
EXISTING
UTILITIES.
450
440
430
19)
420
410
400
390
w
10 0 10 20 30
Now -
VERTICAL SCALE: 1 " _ 10'
30 0 30 60 90
HORIZONTAL SCALE: 1 " = 30'
so
470
460
450
440
430
420
410
fI
r
STORM SCHEDULE
STR#
TYPE
NOSE
TOP ELEV.
HEIGHT (FT.)
LENGTH (FT.)
DIAMETER
MATERIAL
SLOPE
INV. IN
INV. OUT
1
NYLOPLAST
430.87
6.27
ST-1 1 24" DRAIN BASIN
WITH SOLID TOP
1A
87.00
24"
24" TYPE S HDPE
0.49%
425.03
424.60
1 B
43,31
24"
24" TYPE S HDPE
0.62%
424.60
424.33
2
NYLOPLAST
TYPE B
428.36
3.33
2.50
24" DRAIN BASIN WITH
2'x2" ROAD & HIGHWAY
GRATE INLET
3
114.87
181'
18" TYPE S HDPE
0.55%
425.66
425.03
4
DI-3C
TYPE B
429.83
4.17
6.00
ST-1
5
186.25
15"
15" TYPE S HDPE
1. 91 %
429.31
425.76
6
DI-38
TYPE B
433.23
3.92
6.00
7
82.89
15"
15" TYPE S HDPE
0.60%
429.91
429.41
8
MH-2
435,52
5.61
ST-1
9
59.14
15"
15" TYPE S HDPE
0.51 %
430.31
430.01
10
DI-3A
TYPE B
434.24
3.93
2.50
11
9.31
12"
12" TYPE S HDPE
3.65%
430.75
430.41
12
NYLOPLAST
433.33
2.58
12" INLINE DRAIN WITH
DOME GRATE
13
6.96
181"
18" TYPE S HDPE
0.86%
409.81
409.75
14
MH-2
414.68
4.87
ST-1 1 60" MH-2
15
128.54
36"
36" TYPE S HDPE
0.19%
410.06
409.81
16
MH-2
416,39
6.33
ST-1 160" MH-2
17
144.68
18"
18" TYPE S HDPE
0.48%
410.75
410.06
18
DI-3B
TYPE B
414,66
3.91
10.00
IS-1
19
82.42
151'
15" TYPE S HDPE
3.08%
413.29
410,75
20
DI-3B
TYPE B
417.04
3.75
4.00
21
38.78
12"
12" TYPE S HDPE
2.97%
435.15
434.00
22
NYLOPLAST
439.76
4.61
12" INLINE DRAIN WITH
SOLID TOP
23
50.75
12"
12" TYPE S HDPE
1. 20 %
435.76
435.15
24
NYLOPLAST
43&99
3.23
12" DRAIN BASIN WITH
SOLID TOP
25
20.62
12"
12" TYPE S HDPE
3.10 %
436.40
435.76
26
NYLOPLAST
440.83
4.43
12" INLINE DRAIN WITH
DOME GRATE
27
67.60
12"'
12" TYPE S HDPE
2. 86 %
438.33
436.40
28
NYLOPLAST
440.83
2.50
12" INLINE DRAIN WITH
DOME GRATE
29
32,48
12"
12" TYPE S HDPE
6.16%
440.33
438.33
30
NYLOPLAST
442.83
2.50
12" DRAIN BASIN WITH
DOME GRATE
31
118.05
12"
12" TYPE S HDPE
1.08%
441.61
440.33
32
NYLOPLAST
445.11
3.50
12" DRAIN BASIN WITH
SOLID TOP
33
108.55
12"'
12" TYPE S HDPE
1. 00 %
442.70
441.61
34
NYLOPLAST
447.18
4.48
12" DRAIN BASIN WITH
SOLID TOP
35
37.14
12"
12" TYPE S HDPE
1. 02 %
443.08
442.70
36
NYLOPLAST
446.08
3.00
12" INLINE DRAIN WITH
STANDARD GRATE
37
67.71
12"
12" TYPE S HDPE
2.57%
437.50
435.76
38
NYLOPLAST
439.50
2.00
12" INLINE DRAIN WITH
STANDARD GRATE
39
135.05
15"
15" TYPE S HDPE
0.50%
410.42
409.75
40
MH-2
413.82
3.40
41
9.37
15"
15" TYPE S HDPE
1 0.53%
410.57
410.52
42
D I-3 F
TYPE B
412.8E
2.29
4.00
TIMBERLAND PARK APMTS
OLD LYNCHBURG ROAD
SDP2017-16 & WP02017-05
SCOTTSVILLE DISTRICT
ALBEMARLE COUNTY
SHEET: 4 of 5
DATE: JANUARY 30, 2020
FILE: TIMBERLAND PARK -
STORM AB.DWG
STORM AS -BUILT SURVEY I
PERFORMED BY:
MERIDIAN
PLANNING GROUP, LLC
440 Premier Circle, Suite 200
Charlottesville, VA 22901
(P) 434.882.0121
��'ALTN 0/-
o
11 Z RAY MILLER >
Lic. No, 2065
1AV,D
SHEET
AB-400