HomeMy WebLinkAboutWPO201300032 Plan - VSMP 2021-06-18r
GIOv¢
C°
u"p
9 R4rf.'mRd
TT:
� Owe P¢h
4 �144
e V,
w, .cowtlr
�QC FtllYna - µdo WeV e
o� a4
`E
VSMP AMENDMENT #2 FOR WP0201300032
CASCADIA -BLOCKS 4 - 7
TIM 62, PARCEL 25
TM 78, PARCELS 59 & 59A
TM 78E, PARCEL H1
RIVANNA DISTRICT, ALBEMARLE COUNTY, VIRGINIA
q4 oa "
xtlmwd Rd
9
P ��4 •�
r
}a HansenRd d .?
ol= R.yvd
Cmiepe Ch Cmtlo.
RiverbeM�4 HN CaMM
c¢rao.
Mav Rd rylaa 0ele ®3012 Garyle- EEX In Aoagk4
COUNTY ENGINEER
Curve
Radius
Tangent
Length
Delta
Chard
Chord Bear.
C1
17500
9.6519.2968
56
19..2.8
S 26101 23 W
3
33.50
5.4
87.22
915C2
20'5255 E
C3
540.0056.
113.12
2'00
1291
7'0351 W
C4
35.00
29.63
49.18
8N
523
N'630702 E
C5
225.01
12.41
24.79
1647
478
N'260124 E
C6
3
121454
314.16
N 13'3420 E
Course
Beoring
Distance
L1
S 76'09 34 E
11.47
L2
N 821849 E
1&27
L3
N 55'4711 E
24.40
L4
N 54'3417 E
51.77
L5
N 6T5310 E
24.62
I
N 78'35 38 E
53.53
L7
S 88'54 21 E
14.91
L8
S 5C53 41 E
54.57
L9
S 43'0813 E
141.55
L10
S 53'42 27 E
102.87
L11
S 1 T4615 E
166.27
L12
S 10'3018 W
81.51
L13
S 26'34 07 E
85.75
L14
S 1111 50 E
193.39
L15
S 425815 E
44.97
Lib
S 03'2749 W
97.27
L17
S 3513 55 E
69.16
L18
S 20'38 22 E
65.59
L19
S 0T4516 W
89.84
00
S 39'49 04 E
53.80
L21
S 39'49 04 E
1170
Lz2
S 25'01 39 W
266.18
L23
N 6458 21 W
192.44
L24
N 64'58 21 W
347.14
L25
S 49'20 31 W
113.71
L26
S 2T51 58 W
53.92
L27
N 225158 E
R.25
L28
N 1312 43 E
64.09
L29
N 6458 21 W
322.64
L30
7401 58 E
53.79
91
N 38'2458 E
181.21
92
N 07'0910 E
108.09
L33
-IT 419 04 E
88.36
TMP 78E-H
FONTANA LAND TRUST
20' RWSA ESMT:
DB 859 PG 53
DB 742 PG 195, 197 PLAT
TMP 78-57A
KMH PROPERTIES LLC.
DB 3222 PC 519
u141111111111111P11
NEW PERMANENT -
DRAIN. EASEMENT
.pB 2436 PG 623
TMP 62-25C
TMP 62-25C1
BROADUS MEMORIAL BAPTIST CHURCH
DB 1109 PC 353
DB 1078 PC 97
10' PRIVATE EASEMENT
TO BROADUS CHURCH PROPERTY
DB 3662 PG 444
20' SANITARY SEWER EASEMENT
DB 3662 PG 444
NAIL SET IN
WOOD BRIDGE
TMP 62-25
CASCADIA DEVELOPMENT, LLC
"PARCEL TWO"
TMP 78-59
TMP 78-59A
TMP 62-25
DB 4209 PC 088
55.266 ACRES (TOTAL)
TMP 78-59
L111S011a
TMP 78-59A
20' SANITARY SEWER EASEMENT
DB 3662 PG 444
NF @ 18"
TMP 62-26
CASON, WILLIAM
DB 793 PC 106
TMP 78-57
PANTOPS-LAKERIDCE LLC.
DB 2805 PC 70
CASCADIA DEVELOPMENT, LLC y591,
"PARCEL ONE" W 210560,
TMP 78E-H1 (TDTAC)
n
DB 4209 PC 088
�¢ `Jry
N
5.506 ACRES TMP 78E-H
N
n
FONTANA LAND >-0B
41
TRUST
I?3 �S9
CAA
CL
`VTgN9
rri
p,9�
>26
j N
7/y
TMP 78E-C
TMP 78E- FONTANA LAND
FONTANA OWNERS
TRUST 18967ON
'ZZ
PONT9NA SN
DB PC 281
SU Sp
��IpISI ACg
A
100' VIRGINIA ELECTIRC &
DN
Z1
POWER CO EASEMENT
AN9Sc
��0
284Y
2g
SEE ALSO DB 867 PG 337
,�i�yTH Oy plc
o
Dustin E. Greene
LiC. N0.
55833 b�
6118121 ti}y
�9SIONAL SI
SW 1 Cover Sheet 2
viations, & Legend
SW3 Existing Conditions
SW4 Subdivision Overview
SW5 Erosion and Sediment Control Phase 3 Plan Overview
SW6 Erosion and Sediment Control Phase 3 Plan
SW7 Erosion and Sediment Control Phase 3 Plan
SW8 Erosion and Sediment Control Phase 3 Plan
SW9 Erosion and Sediment Control Phase 3 Plan
SW 10 Sediment Basin Details
SW 1 1 Sediment Basin Details
SW 12 Sediment Trap Details
SW13 E&SC Details
SW 13A Stormwater Management Plan - Final Grading
¢ al Grading
W 14 Stormwater Management Plan/Details 2
SW1 als
SW 16
Stream Buffer Mitigation Plan
SW 17
Pre -Development
Drainage Areas
SW 18
Post -Development Drainage Areas
SW 19
Storm
Sewer
Profiles
SW20
Storm
Sewer
Profiles
SW21
Storm
Sewer
Profiles
SW22
Storm
Sewer
Profiles
SW23
Storm
Sewer
Profiles and Details
SW24
Storm
Sewer
Calculations
SW25
Storm
Sewer
Calculations
VSMP AMENDMENT #2 FOR WP0201300032
THIS AMENDMENT IS TO CONVERT THE SEDIMENT BASIN FACILITY IMMEDIATELY ADJACENT TO ROUTE 20
NORTH INTO THE PERMANENT WET POND FACILITY THAT WILL PROVIDE STORMWATER MANAGEMENT WATER
QUANTITY AND QUALITY CONTROL FOR THE 60.77 ACRE CASCADIA SUBDIVISION. THE NORTHEASTERN
PORTION OF THE POND BOTTOM AND THE EASTERN 2:1 POND UPLAND SLOPE WAS LOCATED IN CUT WITH
DEPTHS OF UP TO 30. SIGNIFICANT ROCK WAS ENCOUNTERED IN THESE LOCATIONS AT THE POND
ELEVATIONS, WHICH WAS FAIRLY HARD ROCK, BUT WAS ALSO FAIRLY RIPPABLE. THE CONTRACTOR RIPPED
AS MUCH OF THE ROCK AS FEASIBLE USING A HOE RAM BUT ENCOUNTERED REFUSAL AT BEDROCK. FOR
THIS REASON, THE PROVIDED POND VOLUME IS APPROXIMATELY 90% OF THE ORIGINALLY APPROVE PLANS.
THE PERMANENT POOL HAS BEEN LOWERED AND THE OUTLET STRUCTURES HAVE BEEN UPDATED SO THAT
THE STORMWATER FACILITY PERFORMS WITH THE INTENT OF THE ORIGINAL APPROVED PLANS AND
CALCULATIONS. PLEASE SEE SHEET 14 FOR THE UPDATED DESIGN DETAILS AND THE H&H CALCULATIONS
FOR COMPLIANCE WITH THE ORIGINAL APPROVED PLAN.
11
a
�2
*o
x
N Cn
00) 2 1
W
W
Na
E-,
Z
Q�
ZO
2 aD
O�
x LLU
>
0
Q•,Lz
V1
QW
J
JJ
U�
42
at,W
W Q
W
LI
Ootor
V,K
l
ON
w
pR
Urn
N
Wg
O�
Q�
QLL
4W
Wjj
IK to
p
CO
W
o
I�
%
a
REVISIONS
EROSION
STABILIZATION
AREA ADDED
AUG. 22, 2018
COUNTY
COMMENTS
OCT. 2, 2018
VSMP
AMENDMENT
FEB 19, 2021
COUNTY
COMMENTS
APR. 2, 2021
COUNTY
COMMENTS
MAY 6, 2021
DATE
APR. 17, 2014
SCALE
AS SHOWN
O
LL
�i
z
z
��
iz
Z
O
0
W
Z
W
J
m
_
�
W
T_
Q
Q
w
m
a
W
W
W
O
U
Q
Pr
Q
U0
G
Q
Q
U'-
Ir
FILE NUMBER
12.0065
SHEET
SW1
ction Compacted Soil
/ First lntercontist Chu
a
Broadus B Pwith PY0 0� Riprap Class 1A
/ accordance _ _ _'.'.'.' O
Emer enc Spillway
= 355.93'
/ - nb 4712
& C'r O O , , Filter Cloth and riprapI I" MjNI O O
p' to be keyed into �2 25' MIN
embankment 9" =III_
Tie riprap into the top edge of
the existing riprap ditch for a
smooth transition for flow 3.0' MIN
/ 58� '--/--_
/" O 8 MODIFIED PERMANENT DIVERSION DIKE DD
SW14 NOT TO SCALE
i 55.3 /
/
11 TIE INTO EXISTIN� ,
; - _-r_ / / I% I / f / /
^\\ , EMERGENCY / � I � I I � � ��� I � / / 1 / � //I // j/I I / I � /�'// / //'/ /% V •/i // _/
\ A SPILLWAY��
K I I
/I / / / / /
;/r '
cc
OCP raiser
\ � I
1A
�
\ I I /J
/ \ Iz 1 I \ / II I II II III I I I II
Ma nt�na@c II I I I I I I I I I I II \ II
\ i \ MEase(nelnt 1 I I I I 12:11 I\
\ \ \ I \ DB 14712 1PG 104 V I II I II I II I I II 11 II it \ \ A v \
qB 4732 �G16/I
�l -17 Pbnd
3 \\ \ I \ 3o I 606
\ �.-'n.
Q z ah
o
\ \\ \\ 1 \\ I
\\ 1
\I\,,\\III I I I
\
45
\ \\ I\ \\ \\ \ \\\\
1
\
\ \ \ \ I \ \ \ \ \ \ \\\ \ \ \
lice Ith
I\ \ V I T I td. 05
\ \ 1 A V v
\ V 11 VAI\11 s Existll \V�mp
\ 1 \ 1 Constwl
\ DB 55WW Fq I
\\ V
X 5
o
�P
/ \ \ 3 v / / V. 0 Fo ebeY \ I A V 1 (\ I
Sedimefit �V A 1 \\ \\
V/Ok
\� \\ \ \
A v v
v THI \V LIN INDICATES v THE\SEPA ATION
\ v ®ET%N SWM-2 AND
\\ v\ SDP2 4000h,
v \ / o m�J \ v A V v v
\ a
I
30 \ \ 0 3b \, 60 90\
SCALE: 1 _
1 /
X / /
1 '-
1 / I
O /
� / I
to -
\ \ MATCH EXISTING
\ RIP RAP CLASS IA
I
Weir Report
Hydm=EWm EMenebnfpr Autotlask®Aub MCNiil 3M by Aurotleek, Inc. Wetlneelay. Me 132014
SWM-1 Sediment Forebay
Trapezoidal Weir Highlighted
Crest = Sharp Depth (ft) = 1.85
Bottom Length (ft) = 14.00 Q (cfs) = 131.26
Total Depth (ft) = 2.00 Area (sqft) = 32.74
Side Slope (z:1) = 2.00 Velocity (ft/s) = 4.01
Top Width (ft) = 21.40
Calculations
Weir Coeff. Gw = 3.10
Compute by: Known Q
Known Q (cfs) = 131.26*
Depth (ft) SWM-1 Sediment Forebay Depth (ft)
3.00
3.00
2.00
2.00
1.00
1.00
0.00
0.00
-1.00
0
- Weir
5 10
- W.S.
-1.00
15 20 25 30 35 40
Length (ft)
* 10-Year flow rate of 131.26 cfs from Hydrologic and Hydraulic calculations for SWM-1.
1 ) SWM-1 SEDIMENT FORBAY SPILLWAY
V1 4 NOT TO SCALE
Yr. Elev=356.99'
Embankment Elev.=358.00'
40'
2
Riprap Weir class 1A
Weir Elev.=355.93' (Outfalls Into class 1A,
Rip -Rap Channel
16' wide section)
EMERGENCY SPILLWAY DETAIL
3 SECTION B-B
SW14 NOT TO SCALE
Note: Clear and maintain the emergency spillway free of vegetative growth.
Top of Dam Elev = 352.25
Forebay Bottom = 346.0
SWM-1 FOREBAY DETAIL
6 SECTION B-B
SW14 HORIZ. SCALE: 1`12'
VERT. SCALE: 1"=6'
7
SWM-1
DETAIL
SW14
HORIZ. SCALE:
VERT. SCALE:
1"=6'
1"=T
ex
75° V-NOTCH WEIR. Elev. 354.00'
10quctic
Bch nch
3.0" Orifice*, Elev. 349.60' p
Elev. = 348.60'
Bottom Elev Pond 1 = 344.0'P�J ' 8'4x1.5'
Concrete Base
ShortVersion BMP Computations For Worksheets 2 - 6
Albemarle County Water Protection Ordinance: Modified Simple Method
Plan: Cascadia -Pondt Water Resources Area:
Development Area
Prepares. Dominion Engineering Date: 1/31/2D13
Project Drainage Area Designation Pond-1
L storm pollutant expo t in pounds, L = [P(Pj)RW12 ] [ C(A)2.72 ]
Rv mean mooffcoefticiem, Rv=0,05+0.0090)
Pi small shame correction factor, 0.9
I cement imperviousness
P annual precipitation, 4Y in Albemarle
A project area in acres in subject damage area, I A = -
C pollutant concentration, mgA or ppm target phosphorus
f factor applied to RR
v required treatment volume in cy, 0.5" over imperv. area = A0)4356O(0.5H2y27
RR required removal, L(post) -fx L(pre)
°/d2R removal efficiency, RR700/L(post)
Impervious Cover Computation (values in feet & square feet)
hem
predevelopment Area postdevelopment
Area
Roads & Parkm9 Length Width subtotal Length
Width
subtotal
0 0 101059
0 0
101059
0 0 0
0 0
10890
0
0 0
0
0
701059
0 1
Driveways Length Width no. subtotal
Length Width
nl
subtotal
and walks 0 0 0
0
0
0 0
0
of
o 0
0
0
0 0
0
0
0
ul
0 0
- 1 2 3 4
1
2 3
4-
0
0
Gravel areas Area
Am
x 0.70=
0
4356x
0.70=
3
structures
Am no. subtotal
Am
'10,
sublevel
1 0 0 435601
1
01 0
43560
and cultivated tuff
I 152460 x 0.08 =
1 12196.81
1 217800 x 0.08 -
_yards
Active crop land
Am
Am
x0.25Other
mp vious Areas
-----is0.25-
J
Impervious Cover
I(pre)
Rv(pos0 V
024 2813
New Development (For Development
Areas, tied
all his I mpervlous cover <= 20W
C f I (pre)
Rv(pre) Liam)
L(post)
RR %RR
Area Type
070 1,000000..
0��23 28.58
29.361
0.78 i
DevebPmem Ante---
��20%
035 L"�
21 ffi.05
74.88
7.83
Dnnkirg Water Wetershnds
OAO 1.
021 14.92
16.78
I 1.86
Other Rural Land
' m in values
Re barelopment [Far Development Areas, existing Impervious cover> MY4
C 1 I (l
Rvgue)
L28.)
LIPart)
RR %RR
Area Type
2056
29W
364
Devebpmem Area
070 090 023
0 35 0 85
U 21
13 M
14 66
1 3.59
Dnnkirg Water Watersheds
040 OM,
021 14W
16781
4.In-Other
Rural Land
Imenm Manual, Page 70
rev 16 Feb 1998 OLD
Embankment Elev.=352.
rvicee ucv. wv.v
EMERGENCY SPILLWAY DETAIL
!:)(SECTION A -A)
SW14 NOT TO SCALE
2
15' Aquatic
Bench
s Core*
*Impervious core shown for informational
purposes only. Final design to be provided
by geotechnical engineer.
FAI
Inv= 346.57
-Embed 6"
in Concrete
Elev. = 348.6
SWM-1 Bottom = 344.0
Top of Dam
Elev = 358.00
66.0'-30" HDPE
2.83%
Cutoff Trench*
inn v_
Short Version BMP Computations For Worksheets 2 -6
Albemarle Courtly Water Protection Ordinance Modified Simple Method
Plan: Casuain subdivision Water Resources Area:
Deem proem Area
Prepares: Dominion Engineening Date: ti/13YL014
Project Drainage Area Designation DA D2PCSTDEVELOPMENT
L storm pollutant export in pounds, L= [Pfl)Rv/12 ] [ CtA)2.72 ]
Rv mean mnoff coefficient, Rv=0,05+000N)
P small storm correction factor, 0.9
)
Ipercent impetuousness
P annual precipitation, 43" in Alternate
A project area in acres in subject drainage ama, A =
C pollutant concentration, mg4 or ppm target phosphorus
/ factor applied to RR
V required treatment volume in cy, 0.5" over imperv. area = AON3560(0. 5/12y27
RR required removal, L(post) -fx Lima)
'ARR removal efficiency RR1001-post)
Impervious Cover Computation (values in feet & square bet)
Item
predevelopmem Area poetdevelopment
Area
Roads & Parking Length Width subtotal Length
Width subtotal
0 0 0
0 01 152460
0 0 0
0 0 0
o
D o 0
ul 0
0 152460
Dnveways Length Wdlh no. subtotal Length Width
nl subtMel
and walks 0 0 0 0 0
0 0 58806
0 0 0 0 0
0 0 23958
-1 0 0 01
0 82764
- - 1 2 3 4 1
2 3 4
0 0
0
Gravel areas Am
Area
x 0.70 =
0
x 0.70 =
3049.2
4356
Structures
Area no.
ad
Ante W. subtotal
_btotel
21780
124
0 U�
0 0
21780
210003
Activelyyrazed pasture 8
Area
Am
yetis and cultivated turf
982676 x 0.Do -
77014.08
644801 x 0.08 =
5156808
Active crop lend
Area
Am
x 0.25=
0
x0.25=
0
Other Impervious Areas (Future
Development `Tarn"
Phase)
0
300000
Impervious Cover
4D%
I(pn)
I(post)
Wiliest) V
0.41 1234.3
New Development For Development
v
Amos existing Impervious cover <=20%d
P g De
C T I (pre)'
Win.) L(prt)
L[posq
RR % RR
Area Type
0.70 100 20%
023 64.30
11543
5113 44%
Development Am
0.35 100 0%
Om 13.25
57.71
44.466-17%
Drinking WaterWatemheds
040 100 1%
Om 15.15
65.96
50.81
Other Rural Lend
' min. values
Retlevelopre end (For Development Area; existing impervious cover> MW
C f I (pre)'
Wbanal Liters)
L[posg
RR %RR
Area Type
070 U
023 8430
11543
s156
Development Area
0 35 0 to '
0 m 13 25
Sf 11
4645 -
until Water Watersheds
040 Out
Om 15.15
65.96
Sus
Other Rural Land
btedm Manual, Page 70
rev 16 Feb 1998 OLD
2 BMP CALCULATIONS
SW14 SCALE: 1"=100'
s
� ar
�m. •••••••�c••
•••.•••.1111
i
gal
••••••••+••
•4.4.4.4.4.141+141+1411
d•It 50'ddO+Y+'
,,,'
111
: j F
;?�
•0'J0; •S'Jtt!01
••//111/1111
�;;
� �
a
LD (TYP.)
1/2• x 1 1/2- x 1/4"
STEEL ANGLE (TYP.)
11/2- x 1/4' STEEL
- 3- - 3 STOCK MELDED TO
M3BASE AS SHOWN
GENERAL NOTES FOR TRASH RACK
1. STEEL TO CONFORM TO ASTM A-36.
ev. - 349.E 2. ALL SURFACES OF TRASH RACK(S) MUST BE HOT DIPPED GALVANIZED AFTER FABRICATION.
3. TRASH RACK(S) TO BE FASTENED TO WALL WITH 1/2" MASONRY ANCHORS. TRASH
RACK(S) TO BE REMOVABLE.
4. TRASH RACK(S) TO BE CENTERED HORIZONTALLY OVER THE OPENING.
5. FABRICATOR MAY MODIFY COMPONENTS OF TRASH RACK FRAME TO IMPROVE
CONSTRUCTABILITY OF TRASH RACK. MODIFICATIONS MUST BE APPROVED BY
MCDPS PRIOR TO FABRICATION.
Emeraen
mpervious Core**
* DETAIL TAKEN FROM MONTGOMERY COUNTY, MARYLAND
WATER RESOURCES SPECIFICATIONS.
= 355.93'
5 ORIFICE TRASH RACK
SW14 NOT TO SCALE
*Trash rack to be installed on orifice as sh
on detail 5/SW14 or approved equal.
**Impervious core and cutoff trench shown
for informational purposes only. Final
design to be provided by geotechnical
engineer.
ayTs of dr�c
44 f1
o 7 Is,
Dustin nEE.`.GGreene
Lic. No.
ti 4 55833 `
�O�r 8/18/EIo1$4r
93ZONAL So
1.5 yr. Elevation
= 354.03'
2 yr. Elevation =
354.23'
10 yr. Elevation =
355.75'
100 yr. Elevation
= 356.99'
Inv = 344.70
ES-1
n
h
W
G
rn 0
C\1 Do
DO
W
W
W
Na
Z
ao
2
z0
�i
oab
0
>
O
LL
W
CC 4J
2
0 %"
Q
> Q
co 2i
W
L[ [
XJ
V -a
O N
(t_
U rn
-ail
O
�)
u±,
Wd
2
Q
0�
f�
a�
IA.
O
fr xQ
0 l
¢ CC
�W
I
wo
Q�
Ho
y,
pq
W
W
Or
2
�'T
lL
O
�
O
a
REVISIONS
EROSION
STABILIZATION
AREA ADDED
AUG. 22, 2018
COUNTY
COMMENTS
OCT. 2, 2018
VSMP
AMENDMENT
FEB 19, 2021
COUNTY
COMMENTS
APR. 2, 2021
COUNTY
COMMENTS
MAY 6, 2021
/
DATE
APR. 17, 2014
SCALE
AS SHOWN
U)
J
W
r
LL
Z
l
tF3
2
z
Q
C/)
Y
>
d
0
?
o
�
U
W
m
ir
w
CW
G
I
W
Q
Q
Q
k
Q
WIr
Q
U
C
Q
~
11
W
Q
U�
Cl
i_
a
z
�
U�
o
FILE NUMBER
12.0065
SHEET
SW14