HomeMy WebLinkAboutWPO201300032 Plan - VSMP 2021-02-19I,
VSMP AMENDMENT #2 FOR WP0201300032
CASCADIA -BLOCKS 4 - 7
TM 62, PARCEL 25
TM 78, PARCELS 59 & 59A
TM 78E, PARCEL H1
RIVANNA DISTRICT, ALBEMARLE COUNTY, VIRGINIA
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COUNTY ENGINEER
Curve
Radius
Tangent
Length
Delta
Chord
Chord Bear.
C1
19.2.9
618 56
19..2.6
S 26'01 23 W
C2
822
48
S'205255 E
C3
540.00456.
12'00 07
1291
7'03751 W
35.00
29.6345C4
80'310
23
N'630702 E
225.01
12.41
847
61
2C5 78
N -260124 E4
..
2
34.16
3'34 2006 E
Course
Bearing
Distance
L1
S 76'09 34 E
11.4
L2
N 821849 E
18.27
L3
N 55'4711 E
24.40
L4
N 54'3417 E
51.77
L5
N 635310 E
24.62
L6
N 78'35 38 E
53.53
L7
S 88'54 21 E
14.91
L8
S 54'53 41 E
54.57
L9
S 43'0813 E
141.55
L10
S 53'42 27 E
102.87
1. 1
S 1 T4615 E
166.27
L12
S 103018 W
81.51
L13
S 26.34 07 E
85.75
L14
S 1111 50 E
193.39
L15
S 42'S815 E
44.97
L16
S 0327 49 W
97.27
717
S 3513 55 E
69.16
L18
S 20'38 22 E
65.59
L19
S 02'4516 W
89.84
L20
S 39'49 04 E
53.80
L21
S 39.49 04 E
13.70
L22
S 25-01 39 W
266.18
L23
N 64'58 21 W
192.44
724
N 64'58 21 W
347.14
L25
S 4920 31 W
113.71
L26
S 22'51 58 W
53.92
L27
N 2251 58 E
61.25
L28
N 133243 E
64.09
L29
N 6458 21 W
322.64
L.30
N 401158 E
53.79
L31
N 3824 58 E
181.21
L32
N 07.0910 E
108.09
L33
N 1419'04 E
88.36
IMP 78E-H
FONTANA LAND TRUST
20' RWSA ESMT.
DB 859 PG 53
DB 742 PG 195, 197 PLAT
IMP 78-57A
KMH PROPERTIES LLC.
DB 3222 PG 519
MON. FOUND
NEW PERMANENT -
DRAIN. EASEMENT
DB 2436 PG 623
IMP 62-25C
IMP 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
IMP 62-25
CASCADIA DEVELOPMENT, LLC
"PARCEL TWO"
IMP 78-59
IMP 78-59A
IMP 62-25
DB 4209 PG 088
55.266 ACRES (TOTAL)
IMP 78-59
FARM RD.
IMP 78-59A
20' SANITARY SEWER EASEMENT
DB 3662 PG 444
NF @ 18"
N
IMP 62-26
CASON, WILLIAM
DB 793 PC 106
IMP 78-57
PANTOPS-LAKERIDCE LLC.
DB 2805 PC 70
CASCADIA DEVELOPMENT, LLC y-59-W
"PARCEL ONE" ?10S
IMP 78E-HI 0' (TDTAC)
v
DB 4209 PC 088
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FONTANA LAND 12
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ASSOCIATION,
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FONTANA LAND
TRUST DB PC 281
Opp
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100' VIRGINIA ELECTIRC &
ON
POWERCOMPANY EASEMENT
Aj7gs�
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DOPG 284
2g
SEE ALSO DB 867 PG 337
SW 1 Cover Sheet 2
viations, & Legend
SW3 Existing Conditions
SW4 Subdivision Overview
�:LTH 0p
Dustin E. Greene
Lic. No.
55833 44
A�On 02/19/21
Bg&ZONAL $�6
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
SW 13 E&SC Details
SW 13A Stormwater Management Plan - Final Grading
al Grading
CSW
4 Stormwater Management Plan/Details 2
1 al s
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.
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REVISIONS
VSMP
AMENDMENT
MAY 24, 2018
EROSION
STABILIZATION
AREA ADDED
AUG. 22, 2018
COUNTY
COMMENTS
SEPT. 17, 2018
COUNTY
COMMENTS
OCT. 2, 2018
VSMP
AMENDMENT
FEB 19, 2021
DATE
APR. 17, 2014
SCALE
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THIS LINE INDICATES \ \ RR p. RET; AVA up- ' /// Nov P
THE SEPARATION
BETWEEN SWM-2 AND
J
SDP201400075\
0 m I<
I 6
6 Z '
w 30' Trail and S a'`>
IAccess Easemen
Y I � 10
30 0 30 60 90 I 1 ■ �►rrrr► ' i
� I-'P
SCALE: 1 = 30'
Weir Report
Hydraaow Express Extemionfor Aubdeak®Aub MCiAl3Mby AuWmk, Inc. Wednesday Aug 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 (sgft) = 32.74
Side Slope (z:1) = 2.00 Velocity (lUs) = 4.01
Top Width (ft) = 21.40
Calculations
Weir Coeff. CIA, = 3.10
Compute by: Known Q
Known Q (cls) = 131.26*
Depth (ft) SWM4 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
SWM-1 SEDIMENT FORBAY SPILLWAY
NOT TO SCALE
Embankment EIev.=
2
Weir EIev.=356.0'
EMERGENCY SPILLWAY DETAIL
J 1(SECTION B-B)
SW14 NOT TO SCALE
Forebay Bottom = 346.0
100 Yr. EIev=357.00'
Grass Weir
(Outfalls Into Rip -Rap Channel
With Same Section)
Top of Dam EIev = 352.25
SWM-1 FOREBAY DETAIL
6 SECTION B-B
SW14 HORIZ. SCALE: 1"=12'
VERT. SCALE: 1"=6'
7
SWM-1
DETAIL
SW14
HORIZ.
SCALE:
1"=6'
VERT. SCALE:
1"=3'
25° V-NOTCH WEIR. Elev. = 353.80'
3.0" Orifice*, Elev. = 349.60'
Elev. = 348.60'
Bottom EIev Pond 1 = 344.0'
10
ntl-
vatic
Ch
0
Short Version BMP Computations For Worksheets 2 -6
Albemarle County Water Protection Ordinance: Modified Simple Method
Plan: cascade - Pond t Water Resources Area: Development Area
Prepares Dominion Engineering _ Date: 1/3112013
Project Drainage Area Designation Pool
L storm pollutant export in pounds, L= (P(Pj)RW12 ] [ C(A)2.72 ]
Rv mean runoff coefficient, Rv=0.05+0.009(0
Pj small storm conection factor, 0 9
1 percent Imperviousness
P annual precipitation, 43' In Albemarle
A project area in acres in subject drainage area,
C Pollutant concentration, mgll or ppm target phosphorus
f factor applied to RR
V required treatment volume in cy, 0.5" ow.+impew.. area = A(043560(G51l2y27
RR required remoal, L(post)-fx Lgi
%RR removal eficiency , RR1004(pos9
Imnervinus cave, Commutation 1valuea In feet a xi ben
Item
pre,ree,lopment
Area
postdevelopment
Area
Roads & Parking
Length
Width
subtmel
Length
Width
subtotal
0
0
101059
0
0
101059
0
o
0
0
0
10890
0
1 ol
ol
0
0
101059
0
111949
Driveways Length
Width
Iw.
subtotal
Length Width
m.
subtotal
and walks 1 0
0
0
0
0
0
0
0
0
0
0
0
0
01
01
0
0
0
0
0
al
ol
1
2
3
4
1 2
3
4
0
0
0
Gravel areas Area
Area
x 0.70 =
0
4358
x 01=
3049.2
Structures
Area
W.
subtotal
Area
W.
subtotal
o
0
43110
0
0
43560
0
0
0
ol
ol
8534
ol
ol
0
43560
1
1
1 0
50004
Actively -grazed pasture &
Area
Area
yards and cultivated turf
752480
x 0.08=
12198.8
217800
x 0.08=
17424
Active crop land
Area
Area
x 0.25=
0
x0.25=
0
Other Impernous Areas
0
0
ImperviousCover
Kpre)
I(Poso
Rv(p
v
0.2424
281.7
New Development
(For DevelopmentArea&
existing Ira pervious cover 2")
C
f
I (pre)'
Rvlpre)
ypre) L(pos0 RR % RR Area Type
0.70
1.Oo
20%
0.23
28,58 29.38 078 3% Development Area
0.35
1.00
0%
0.21
13.05 14.68 1.63 11% Drinking Water Watersheds
0 40
1 00
1%
0 21
14.92 16.78 186 11% Other Rural Land
`min. values
Redevelopment
(For Development Areas,
existing imperviouscover> 20%)
C
f
I (pre)'
Rv(pre)
L[pre) L(post)
RR % RR Area Type
0.70
0.90
2l1%
0.23
28.58 29.38
3.fi4 12% Development Area
0,35
0.85
0%
021
13,05 14.68
359 24% Drinking Water Watersheds
0.40
0.85
0.21
14.92 16.78 4.10 Other Rural Land
Interim Manual, Page 70 rev. 16 Feb 1998 GEB
Embankment Elev.-352.
IYGII LIG V.-JJV.V
EMERGENCY SPILLWAY DETAIL
+ (SECTION A -A)
SW14 NOT TO SCALE
10' Aquatic
Bench
.,_ervious Core*
*Impervious core shown for informational
purposes only. Final design to be provided
by geotechnical engineer.
zi�
Inv=346.57
8'0A.5'
Concrete Base
Embed 6"
in Concrete
Elev. = 348.6
SWM-1 Bottom = 344.0
Top of Dam
EIev = 358.00
(~ 8'
68.28'-30" HDPE
@ 1.90%
Cutoff Trench*
Short Version BMP Computations For Worksheets 2 -6
Albemarle County Water Protection Ordinance: Modified Simple Method
Plan: cartel Subdivision Water Resources Area:
Preparers Dominion Engineering Date: 911312014
Project Drainage Area Designation DAPOND2 PCSTDEVELOPMENT
L storm pollutant export in pounds, L = [P(Pj)RW12 ] [ C(A)2.72 ]
Rv mean bull coar1cient, Rv=0.05+0009(I)
Pj small storm copection factor, 0.9
I percent imperviousness
P annual precipitation, 43" in Albemarle
A project area in acres in subject drainage area, N - -
c pollutant concentration, mil or plan target phosphorus
f factor applied to RR
V required treatment volume in cy, 05" over imperv. area = A(I)43560(O.S192y27
RR required remoal, L(post) -fx L(pre)
%RR removal eft amity , RR100luident)
Impervious Cover Computation hialues in feet & spuare feet)
Area
ter
predevelopment
Area
postdevelopment
Area
Roads & Parking
Length
Width
subtotal
0
Length
Width
subtotal
152480
0
0
0
152460
0
0
0
0
0
0
0
0
0
0
0
0
0
0
Driveways Length
and wall 0
0
Width
0
0
W.
0
0
subtotal
0
0
0
0
Length Width
m.
sudoal
82784
0
0
0
SB
0
0
0
2395Bl188
0
0
0
0
1
0
2
3
4
0
2
3
4
0
Gravel areas Area
x 0.70 =
0
Area
x 0.70 =
3049.2
4358
Structures
Area
0
0
0
no.
o
0
0
subtotal
zneo
0
0
21780
Area
0
ol
W.
0
ol
1
subtotal
18e6o1
240oz
1 0
210003
Actively -grazed pasture &
yards and cultiated turf
Am
982878
x O.OB=
7701d.08
Area
844801
x 0.08=
51588.08
Active crop land
Area
x 0.25-
0
Area
x0.25=
0
Other Impervious Areas (Future
ImperviousCover
Development Town'
Phase)
0
5%
300900
Ilprel IUMS9
Rvlpost)
V
0,41
1234.3
New Development
For Development Areas, existing Impervious cover 20%
C
f
I (pre)' RV(Pre) L[pre)
LlPost)
RR %RR Area Type
0.70
1.00
20% 0,23 64,30
115.43
51.13 44% Development Area
0,35
1.00
0% 0.09 13,25
57,71
4446 77% Drinking Water Watersheds
0.40
1.Do
1% 009 15.15
65.96
5081 77% Other Rural Lend
`min. values
Redevelopment (For Development Areas, existing
impernouscover> 20%)
C
f
I (pre)' RV(Pre) L(pre)
L(post)
RR %RR Area Type
0.70
0.90
20% 0.23 64.30
11543
57.56 50% Development Area
0,35
0,85
0% 0.09 13.25
57.71
4645 80% Drinking Water Watersheds
0.40
0.85
._Ala 0.09 1 15.15
65.96
53.08 80% Other Rural land
Interim Manual,
Page 70 rew. 16 Feb 1998 GEB
inn v_
= 349.
Emeraen
mpervious Core**
BMP CALCULATIONS
SW14 SCALE: 1"=100'
Expanded
Steel Grote (T,T
1�
12
(/\
WELD (TYP.)
0
<
1 1/2" X 1 1/2" X
1/4- STEEL ANGLE
LWD
P.)
Expanded Steel GrateOpen'ng Detail
2J-3 LB PER FT2
Not To Scale
EXPANDED STEEL
GRATE BASED ON
25
22a'
L03"
.2W"
LOW FLOW OPENING
30
1344`
1 940"
1 264'
/16'" HOLES
AS SHOWN
LO (TYP.)
1 1/2" X 1 1/2" X 1/4"
STEEL ANGLE (TYP.)
1 1/2" X 1/4" STEEL
.. 3.. 3. STOCK WELDED TO
BASE AS SHOWN
GENERAL NOTES FOR TRASH RACK
1. STEEL TO CONFORM TO ASTM A-36.
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.
* DETAIL TAKEN FROM MONTGOMERY COUNTY, MARYLAND
WATER RESOURCES SPECIFICATIONS.
Iwav = 356.00'
5_'� ORIFICE TRASH RACK
sue/ NOT TO SCALE
*Trash rack to be installed on orifice as s
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.
�$oTH Op `te
� rf
V 7 9
Dustin E. Greene
Lic. No.
55833
A+0- 02/1e/21 ti}y
O93IONA1, '5
1.5 yr. Elevation = 354.09'
2 yr. Elevation = 354.29'
10 yr. Elevation = 356.03'
100 yr. Elevation = 357.00'
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REVISIONS
VSMP
AMENDMENT
MAY 24, 2018
EROSION
STABILIZATION
AREA ADDED
AUG. 22, 2018
COUNTY
COMMENTS
SEPT. 17, 2018
COUNTY
COMMENTS
OCT. 2, 2018
VSMP
AMENDMENT
FEB 19, 2021
DATE
APR. 17, 2014
SCALE
AS SHOWN
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FILE NUMBER
12.0065
Inv = 344.70 SHEET
Rip -Rap
SW14