HomeMy WebLinkAboutWPO201600004 Plan - As-built 2020-07-22GENERAL NOTES
OWNER/DEVELOPER:
07600-00-00-05200 07600-00-00-052NO
FORGE FARM, LLC JOSHUA OR MALLORY WH17F
195 RIVERBEND DRIVE 1179 SUNSET AVENUE EXTENDED
CHARLOTTESVILLE; VA 22911 CHARLOTTESVILLE, VA 22990J
ENGINEER:
COLLINS ENGINEERING
200 GARRETT ST, SU17E K
CHARLOTTESVILLE, VA 22902
(434)293-3719
TAX MAP NO.:
07600-00-00-05200 (D.B. 4568, PG. 582)
07600-00-00-052NO (D.B. 4391, PG 463)
PROJECT AREA:
10.40 AC
ZONING:
R-4 RESIDENTIAL, ENTRANCE CORRIDOR (ARB APPROVAL REQUIRED)
DENSITY
R-4 ALLOWABLE DENSITY FOR STANDARD LEVEL
CLUSTER DEVELOPMENT 4 D.U./AC.
PROPOSED BONUS DENSITY 5X INCREASE FOR MAINTAINING OVER 10%
OF THE EXJS77NG TREES ON THE PROPERTY.
4 UNITS'/ACRE x 1.05X BONUS INCREASE - 4.2 UNITS/ACRE
ALLOWABLE UNITS = 4.2 UNITS/ACRE • 10.40 ACRES = 4,J7 UNITS
PROPOSED DENSITY.•
SINGLE FAMILY DETACHED: 19
SINGLE FAMILY ATTACHED.
23
TOTAL PROPOSED
LOTS: 42
R-4 DENSITY
42 D. U./f0.40 AC. - 4.04 D. U! /AC.
OPEN SPACE: 3.96 AC (38.1X)
PRESERVED SLOPES: PRESERVED SLOPES EXIST ON THE PROPERTY AND ARE SHOWN ON 7741S PLAN.
POR77ONS OF THE COUNTY PRESERVED SLOPES HAVE BEEN FIELD SURVEYED TO VERIFY THE LIMITS OF
THE 25X SLOPES IN ALONG THE EDGES OF THE PRESERVED SLOPES ANY PRESERVED SLOPE AREAS
THAT WERE MODIFIED DURING THE FIELD SURVEY VERIFICA77ON PROCESS HAW BEEN BE TREATED AS
MANAGED SLOPES ON
THE PROPERTY.
MANAGED SLOPES. • THE MANAGED SLOPES EXIST ON THE PROPERTY AND ARE SHOWN ON THIS PLAN.
OFFS17F DISTURBANCE.
NO OFFSITE DISTURBANCE IS PROPOSED WITH THIS PLAN. SUNSET AVENUE
EXTENDED SHALL BE UPGRADED WITH THE WINTERGREEN FARM PROJECT.
BUILDING HEIGHTS-
MAXIMUM BUILDING HEIGHTS SHALL NOT EXCEED 35 FEET
SETBACKS. •
FRONT: MINIMUM 5' FROM THE R/W AND MAXIMUM 25' FROM R/W
BUILDING SEPARATION. • 10'
REAR: MIN. 20' REAR SETBACK, NO MAXIMUM SETBACK
SIDE. NONE (SEE BUILDING SEPARATION)
FRONT LOADED GARAGE: MIN. 18' FROM R/W
SIDE LOADED GARAGE- MIN. 5' FROM R/W
SUBDIVISION STREETS
CURB & GUTTER
WATERSHED:
7HIS SI7E LIES WITHIN THE MOORES CREEK WATERSHED, WHICH IS NOT A
WATER SUPPLY WATERSHED.
AGRICULTURAL/ FORESTAL DISTRICT NONE
TOPO & SURVEY-
TOPOGRAPHY PROVIDED BY A COMBINATION OF ROUDABUSH, GALE AND
ASSOCIATES AND LOUISA AERIAL SURVEYS INC., JANUARY 2014. THE
BOUNDARY LINE INFORMA77ON /S PROVIDED BY ROUDABUSH, GALE, AND
ASSOCIATES INFORMA77ON FIELD VERIFIED BY COLLINS ENGINEERING JUNE
2015
DATUM:
MAD 83
EXISTING VEGETATION:
MAINLY WOODED
LIGHTING:
NO LIGH77NG IS PROPOSED
PARKING:
(2) OFFSTREET PARKING SPACES PER EACH SINGLE FAMILY DETACHED AND
SINGLE FAMILY ATTACHED UNIT.
(1) PARKING SPACE PER 4 SINGLE FAMILY ATTACHED UNITS REQUIRED.
23 SFA/4 = 5.75 (6 PARKING SPACES REQUIRED)
7 ON STREET PARALLEL PARKING SPACES PROPOSED
PHASING:
NONE
PROFFERS:
NONE
BUILDING SITES.
EACH PARCEL CONTAINS A BUILDING S17E THAT COMPLIES WITH THE
REQUIREMENTS OF THE ALBEMARLE COUNTY ZONING ORDINANCE.
BURIAL SITES, •
NO CEMETERIES WERE FOUND DURING FIELD INVESTIGATION OF THE SITE.
STREAM BUFFERS.
NO STREAM BUFFERS ARE LOCATED ON THIS PROPERTY PER THE ALBEMARLE
COUNTY WATER PROTECTION ORDINANCE
RECREATIONAL AREAS.-
A TOT LOT WITH A MINIMUM AREA OF 6,000 SF IS PROPOSED ON THE
PROPERTY. THE REQUIRED AREA FOR THE TOT LOT IS 200 SF x (23
MUL77-FAMILY UNITS) = 4,600 SF. THE MINIMUM TOT LOT AREA IS ACHIEVED
W17H THIS PROPOSED DESIGN. THE TOT LOT SHALL MEET THE MINIMUM
REQUIRED TOT LOT AMEN171ES AS SPECIFIED IN THE ALBEMARLE COUNTY
ZONING ORDINANCE.
RETAINING WALLS, •
RETAINING WALLS ON THE PROPERTY SHALL HAVE A MAXIMUM HEIGHT OF 10:
LANDSCAPING:
STREET TREES ARE PROPOSED ALONG THE NEIGHBORHOOD STREETS IN
ACCORDANCE WITH ALBEMARLE COUNTY LANDSCAPING REQUIREMENTS
TRASH.-
EACH LOT SHALL HAW ITS OWN INDIVIDUAL TRASH RECEPTACLE.
IMPERVIOUS AREAS. • PROPOSED ROADWAY' 0.99 AC
PROPOSED SIDEWALKS 0.25 AC
PROPOSED ATTACHED HOMES. • 0.78 AC.
PROPOSED DETACHED HOMES.- 0.57 AC.
TOTAL 2.59 AC.
NOTE- THIS PROJECT IS NOT LOCATED WITHIN A DAM INUNDA77ON ZONE
TOTAL AREAS: (10.40 ACRES ON THE PROPERTY)
OPEN SPACE.• 3.96 ACRES
R/W 1.43 ACRES
LOTS: 5.01 ACRES
NOTE- ALL OPEN SPACE WITHIN THIS PROJECT SHALL BE
OWNED AND MAINTAINED BY THE HOMEOWNERS ASSOCIA770M
NOTE. OF THE 3.96 ACRES OF OPEN SPACE ON THE
PROJECT, APPROMMATELY 2.52 ACRES INCLUDES PRESERVED
SLOPES AND OPEN SPACE DEDICATED FOR STORMWATER
MANAGEMENT USES.
NOTE.• AREAS WITHIN PROPOSED STREET RIGHT-OF-WAY AND
AREAS DEPICTED AS OPEN SPACE ON THIS PLAN SHALL BE
DEDICATED TO PUBLIC USE ON THE SUBDIVISION PLAT.
D.B. PG.
NOTE.• THE TOTAL PROPOSED TREE PRESERVA77ON AREA ON
THE PROJECT SITE IS 2.52 ACRES (24.2X). TOTAL AREA OF
TREE PRESERVA77ON OUTSIDE OF THE PRESERVED SLOPES IS
1.11 ACRES (10.7X).
SUNSET OVERLOOK
WPO PLAN
SAMUEL MILLER DISTRICT
ALBEMARLE COUNTY, VIRGINIA
SHEET LAYOUT
SCALE: 1" = 100'
CERTIFICATION OF AS -BUILT SURVEY
I, JOSEPH C. MEDLEY, A LICENSED LAND SURVEYOR IN THE COMMONWEALTH OF VIRGINIA, DO
HEREBY CERTIFY THAT THE AS -BUILT CONDITIONS DEPICTED HEREIN ACCURATELY REFLECT
THE CONSTRUCTION OF THE REFERENCED SITE. THE FACILITIES HAVE BEEN FOUND TO BE IN
CONFORMANCE WITH THE APPROVED CONSTRUCTION PLANS UNLESS NOTED OR IMPLIED
OTHER
0403003385
1_/ LICENSE NO.
p oo A,TH OF 04
I
�JOSEPH/C. MEDLEYS
Lic. No.3385
I'ry � SURV, i.,�i
I
ti
ry
781
877
VICINITY MAP
SCALE: 1" = 750'
(*) COVER SHEET HEREON REFLECTS WPO PLAN SUBMITTAL; PORTIONS OF FINAL
SIGHT PLAN DESIGN ALONG SUNSET AVENUE EXTENDED WERE REVISED INCIDENTAL
TO FINAL SITE PLAN. GRADING AND DRAINAGE DESIGN OVERLAY REFLECTS CONTENT
OF FINAL SITE PLAN HEREIN. SHEETS 3 & 4 OF WPO PLAN ARE SUPERSEDED BY FINAL PLAN
SHEETS 7 AND 8 AS NOTED BELOW SHEET 11, STORM PROFILES, ARE INCLUDED FROM FINAL
SITE PLAN.
Sheet List Table
Sheet Number
Sheet Title
I
COVER
(") --2- 7
GRADING & DRAINAGE PLAN
(*) -4- 8
GRADING & DRAINAGE PLAN
EROSION & 5rD1MrNT- CONTROL PLAN P14ASr
7.
*) 9
STORMWATER MANAGEMENT PLAN
(**) so
STORMWATER MANAGEMENT PLAN DETAILS
6 TOTALSHEETS
/**1 \/CKAP APAFNIIPAFNT *9 t,(1\/FR CHFFT INSFRTFf1
AS -BUILT SURVEY
BY TIMMONS GROUP
28 IMPERIAL DRIVE
STAUNTON, VA 24401
DATE OF SURVEY:
APRI L 22, 2020
BOLD AND OR BOXED
INFORMATION IS
AS -BUILT
AS -BUILT SURVEY NOTES:
1. HORIZONTAL AND VERTICAL DATUM IS
MATCHED TO THE ORIGINAL SURVEY BY
OTHERS AND SUBSEQUENT DESIGN
(AS PROVIDED TO THIS FIRM).
2. BOLD COORDINATES SHOWN FOR STORM
STRUCTURES (PER COUNTY REQUIREMENT)
ARE PRESENTED IN NAD 83 FOR SPATIAL
RELEVANCE.
SHEETS 9 & 10 HEREIN REFLECT REVISIONS PER
VSMP AMENDMENT #2.
W_
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240.55
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CURB & GUTTER
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EC-3A DITCH
DEPTH OF EC-3A DITCH
EC-2 DITCH
DEPTH OF EC-2 DITCH
EAR7N DITCH
DRIV€WAY CULVERT
BENCH MARK
CLEARING LIMITS
WOT STANDARD STOP SIGN
EXISTING CONTOUR
PROPOSED CONTOUR
PROPOSED SPOT ELEVATION
IBC DENOTES TOP/BACK OF
CURB T/B DENOTES TOP OF
BOX
SCALE 1 "=50'
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GENERAL NOTES
DEVELOPER:
ORIGINAL IMP 07600000005200 ORIGINAL TMP 076000000052NO
FORGE FARM, LLC JOSHUA OR MALLORY WH17E
195 RIVERBEND DRIVE 1179 SUNSET AVENUE EXTENDED
CHARLOT7ESVILLE, VA 22911 CHARLOTTESVILLE, VA 229903
ENGINEER:
COLLINS ENGINEERING
200 GARRETT ST, SUITE K
CHARLOTTESVILLE, VA 22902
(434)293-3719
TAX MAP NO.:
ORIGINALLY 07600-00-00-05200 (D.B. 4568, PG. 582)
ORIGINALLY 07600-00-00-052NO (D.B. 4391, PG. 463)
PROJECT AREA:
1D.40 AC
ZONING:
R-4 RESIDENTIAL, ENTRANCE CORRIDOR ( W/TH PRIOR ARB APPROVAL)
DENSITY.•
R-4 ALLOWABLE DENSITY FOR STANDARD LEVEL
CLUSTER DEVELOPMENT. 4 D.U./AC.
PROPOSED BONUS DENSITY 5% INCREASE FOR MAINTAINING OVER f0%
OF THE EXIS77MG FREES ON 7HE PROPERTY,
4 UNITS/ACRE x 1.05% BONUS INCREASE = 4.2 UNITS/ACRE
ALLOWABLE UNITS = 4.2 UNITS/ACRE * 10.40 ACRES = 43.7 UNITS
PROPOSED DENSITY•
SINGLE FAMILY
DETACHED. 19
SINGLE FAMILY ATTACHED: 23
TOTAL PROPOSED LOTS: 42
R-4 DENSITY
42 D.U.110.40 AC. = 4.04 D.U./AC
OPEN SPACE. •
3.96 AC (38.1%)
PRESERVED SLOPES
PRESERVED SLOPES EXIST ON THE PROPERTY AND ARE SHOWN ON THIS PLAN.
MANAGED SLOPES.
THE MANAGED SLOPES EXIST ON THE PROPERTY AND ARE SHOWN ON THIS PLAN.
OFFS17E DISTURBANCE NO OFFSI7E DISTURBANCE IS PROPOSED WITH THIS PLAN. SUNSET AVENUE
EXTENDED SHALL BE UPGRADED WI7H 7HE AINTERGREEN FARM PROJECT.
BUILDING HEIGHTS:
MAXIMUM BUILDING HEIGHTS SHALL NOT EXCEED 35 FEET
SETBACKS:
FRONT. • MINIMUM 5' FROM THE R/W AND MAXIMUM 25' FROM R/W
BUILDING SEPARAT70N: 10'
REAR: MIN. 20' REAR SETBACK, NO MAXIMUM SETBACK
SIDE. NONE (SEE BUILDING SEPARA770N)
FRONT LOADED GARAGE: MIN. 18' FROM R/W
SIDE LOADED GARAGE. • MIN. 5' FROM R/W
SUBDIVISION STREETS: CURB & GUTTER
WATERSHED:
THIS SITE LIES WITHIN THE MOORES CREEK WATERSHED, WHICH IS NOT A
WATER SUPPLY WATERSHED.
AGRICULTURAL/ FORESTAL DISTRICT NONE
TOPO & SURVEY.•
TOPOGRAPHY PROVIDED BY A COMBINATION OF ROUDABUSH, GALE AND
ASSOCIATES AND LOUISA AERIAL SURVEYS INC., JANUARY 2014. THE
BOUNDARY LINE INFORMATION IS PROVIDED BY ROUDABUSH, GALE, AND
ASSOCIATES INFORMA77ON FIELD VERIFIED BY COLLINS ENGINEERING ON
JANUARY 3, 2018.
DATUM:
NAD 83
EXISTING VEGETATION.- MAINLY WOODED IN PRE -DEVELOPMENT STATE
L1GH77NG.-
NO LIGH77NG IS PROPOSED
PARKING.
(2) OFFSTREET PARKING SPACES PER EACH SINGLE FAMILY DETACHED AND
SINGLE FAMILY ATTACHED UNIT.
(1) PARKING SPACE PER 4 SINGLE FAMILY ATTACHED UNITS REQUIRED.
23 SFA/4 = 5.75 (6 PARKING SPACES REQUIRED)
7 ON STREET PARALLEL PARKING SPACES PROPOSED
PHASING:
NONE
PROFFERS:
NONE
BUILDING SITES.-
EACH PARCEL CONTAINS A BUILDING SITE THAT COMPLIES WITH THE
REQUIREMENTS OF THE ALBEMARLE COUNTY ZONING ORDINANCE.
BURIAL SITES
NO CEMETERIES WERE FOUND DURING FIELD INVES77GA77ON OF THE SITE
STREAM BUFFERS. •
NO STREAM BUFFERS ARE LOCATED ON THIS PROPERTY PER THE ALBEMARLE
COUNTY WATER PROTEC77ON ORDINANCE
RECREAT70NAL AREAS. A TOT LOT WITH A MINIMUM AREA OF 6,000 SF IS PROPOSED ON 7HE
PROPERTY. THE REQUIRED AREA FOR 7HE TOT LOT IS 200 SF x (23
MUL77-FAMILY UNITS) = 4,600 SF. THE MINIMUM TOT LOT AREA 15 ACHIEVED
W7H THIS PROPOSED DESIGN. THE TOT LOT SHALL MEET THE MINIMUM
REQUIRED TOT LOT AMENI77ES AS SPECIFIED IN THE ALBEMARLE COUNTY
ZONING ORDINANCE
RETAINING WALLS.
RETAINING WALLS ON THE PROPERTY SHALL HAVE A MAXIMUM HEIGHT OF 10.
LANDSCAPING. •
STREET TREES ARE PROPOSED ALONG THE NEIGHBORHOOD STREETS IN
ACCORDANCE WITH ALBEMARLE COUNTY LANDSCAPING REQUIREMENTS.
TRASH:
EACH LOT SHALL HAVE ITS OWN INDIVIDUAL TRASH RECEPTACLE.
IMPERVIOUS AREAS. •
PROPOSED ROADWAY. 0.99 AC
PROPOSED SIDEWALKS: 0.25 AC
PROPOSED ATTACHED HOMES: 0.78 AG
PROPOSED DETACHED HOMES: 0.57 AC.
TOTAL 2.59 AC.
NOTE.• THIS PROJECT IS NOT LOCATED WITHIN A DAM INUNDA77ON ZONE.
TOTAL AREAS: (10.40
ACRES ON THE PROPERTY)
OPEN SPACE:
3.96 ACRES
R/k
1.43 ACRES
LOTS. •
5.01 ACRES
NOTE.• ALL OPEN SPACE WITHIN THIS PROJECT SHALL BE
OWED AND MAINTAINED BY THE HOMEOWNERS ASSOCIA7701V
NOTE.• OF THE 3.96 ACRES OF OPEN SPACE ON THE
PROJECT, APPROXIMATELY 252 ACRES INCLUDES PRESERVED
SLOPES AND 2.93 ACRES INCLUDES PRESERVED OPEN SPACE
DEDICATED FOR STORMWATER MANAGEMENT USES
NOTE: THE TOTAL PROPOSED TREE PRESERVA77ON AREA ON
THE PROJECT S17E IS 2.52 ACRES (24.2%). TOTAL AREA OF
TREE PRESERVATION OUTSIDE OF THE PRESERVED SLOPES IS
1.11 ACRES (10.7%).
wly
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C 1wSUNSET OVERLOOK
QO17Sr FA
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4 Vil gyp'{ `Iy�
G
VSMP AMENDMENT #� 2 S m �a,4��4MWO
-_ ._ JCL � ,.� `[� �. .;.'•�_-)e>1
TO WPO 201600004 - Sh
f
��Nr 876
Ry GRE N .D / .. .
yNin . Ga0 S7A E�OPG -
SAMUEL MILLER DISTRICT ya
7 `
ski - s
ALBEMARLE COUNTY, VIRGINIA
SHEET LAYOUT
SCALE: 1" = 100'
.. T T T T T T T T r,r,rrr
VSMP AMENDMENT #2 PROPOSED CHANGES:
A THE PREVIOUSLY APPROVED TWO BIORETENTION BASINS OUTFALLING INTO THE DETENTION
` CELL HAVE BEEN REMOVED. THIS RESULTS IN THE FOLLOWING UPDATES:
A. REVISED DETENTION CELL GRADING AND THE REMOVAL OF THE ADJACENT RETAINING WALL
B. REVISED WATER QUALITY & QUANTITY COMPUTATIONS
C. REVISED ORIFICE CONTROL STRUCTURES ON THE RISER
2Q WITH THE REMOVAL OF THE BIORETENTION BASINS, ONE OF THE OUTFALLS WAS REQUIRED TO
BE RELOCATED TO OUTFALL INTO THE AMENDED DETENTION CELL
AS -BUILT SURVEY
BY TIMMONS GROUP
28 IMPERIAL DRIVE
STAUNTON, VA 24401
DATE OF SURVEY:
APRIL 22, 2020
BOLD AND OR BOXED
INFORMATION IS
AS -BUILT
AS -BUILT SURVEY NOTES:
1. HORIZONTAL AND VERTICAL DATUM IS
MATCHED TO THE ORIGINAL SURVEY BY
OTHERS AND SUBSEQUENT DESIGN
(AS PROVIDED TO THIS FIRM).
2. BOLD COORDINATES SHOWN FOR STORM
STRUCTURES (PER COUNTY REQUIREMENT)
ARE PRESENTED IN NAD 83 FOR SPATIAL
RELEVANCE.
VICINITY MAP
SCALE: 1" = 750'
Sheet List Table
Sheet Number
Sheet Title
1
COVER
0 1 7
GRADING & DRAINAGE PLAN
0 —§— 8
GRADING & DRAINAGE PLAN
& SEDIMENT CONTROL I
__6__
EROSION PLAN P! 1ASE
EROSION 9, SEDIMENT CONTROL PLAN 12WASE, 11
9
STORMWATER MANAGEMENT PLAN
.. 10
STORMWATER MANAGEMENT PLAN DETAILS
3 TOTALSHEETS
(") VSMP AMENDMENT #2 COVER SHEET INSERTED
SHEETS 9 & 10 HEREIN REFLECT REVISIONS PER
VSMP AMENDMENT #2.
LEGEND
ROADS
EXISTING CULVERT
CULVERT
®
DROP INLET & STRUCTURE NO.
CURB
CURB & GUTTER
PROPOSED PAVEMENT
EC-3A DI R;H
B"
DEPTV OF EC-3A DITCH
EC-2 DITCH
g"
DEPTH OF EC-2 DITCH
®...�...
EARTH DITCH
DRIVEWAY CULVERT
,f
BENCH MARK
_ _ _ _ _
CLEARING LIMITS
VDOT STANDARD STOP SIGN
210
EXfS77NG CONTOUR
200)
PROPOSED CONTOUR
240.55
PROPOSED SPOT ELEVATION
TBC DEN07ES TOP/BACK OF
CURB TAB DENOTES TOP OF
BOX
SCALE 1 "=50'
0 50, 100,
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EOREST
\OPEN SPACE EASEMENT
/[O<1NTY6EiWE�.
.•,., , , ;AVV4%L7 LtZr1 R.t.*:f T'7fi3i?� J1MF_
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General Construction notes for Stormwater Management Plans
s All dams and constructed fill to be within 95% of maximum dry density and z% of
optimum moisture content. All fill material to be approved by a geotechnical
engineer. A geotechnical engineer is to be present during construction of dams.
2. Pipe and riserjoints are to be watertight within stornwater Management facilities.
3. For temporary sedlmenttraps or basins which are to be converted to permanent
stormwater management facilities; conversion is not to take place until the site is
stabilized, and permission has been obtained from the County erosion control
Inspector.
Totel Proposed Impervious Anm
SIN
Sickwolk
M,%4 sf
RasiderIces- Affisched Homes
33,940 sf
Rasidarmw Detached Homes
24,70D d
112,026 d
210= d
4A96 Hf
13,940 of
AW Sf
9 sf
0AM Hf
n1 � 1 . r
INFORMATIONAL; NO AS -BUILT
DATA HEREON.
DENOTES SWM FOREST AND OPEN SPACE EASEMENT
& TREE PRESERVATION ( WOODLAND PRESERVATION
NOTE: THE SWM FOREST AND OPEN SPACE EASEMENT IS
SUBJECT TO THE GUIDANCE SET FORTH BY THE DEQ IN THE
VIRGINIA STORMWATER MANAGEMENT PROGRAM. THE
AREAS WILL REMAIN UNDISTURBED IN A NATURAL,
VEGETATED STATE, EXCEPT FOR ACTIVITIES AS APPROVED BY
THE LOCAL PROGRAM AUTHORITY, SUCH AS FOREST
MANAGEMENT, CONTROL OF INVASIVE SPECIES, REPLANTING
AND REVEGETATING, PASSIVE RECREATION (eg., TRAILS), AND
LIMITED BUSH HOGGING TO MAINTAIN DESIRED VEGETATIVE
COMMUNITY (BUT NO MORE THAN FOUR TIMES A YEAR).
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SHEET NO.
9
)ETENTION CELL SERVING G SUBAREAS'A' &'B' r '/ / _� / A VU"IPRAPE,paERGYDISSIPATER A :.1 =30 f DING T E STREAM BAI RI L NOT
DETENTION CELL ROUTING
WEA -=RB TMM CONTII SHALL_ WGN
RIPRAP ER DISSIPATERSUCHTHAJ4TP INi ALLELS/
THE 3
NQ1 15S a ovONK EfERPE Y.
Routin Method: storage -indication Basin Input Data Inflow Hydrographs
IT
-{�/ r SSAriln'm-.c[�ri'ITFAII_._
CU - " H ra h o Basin: Detention Basin with Amended Riser and Volume
��EALf'•9=•'�30' e 1 STIN6"WcLIBj.RmTOMODIFY L- `BARR L 5.01 i-Yra4-HourSCS stormevent 41nHyd� ragophs
J E PROFILIITHIS SHEET INVINygm , In(low(clis(hr
) 7-438at %2.o2s) 6 Contour Areas SCS
' `60'� IFICATIO AILS �IN('r%OUT -- - 4 discharge(cfs) 0.445at 13.5801m) ElevatkrKft) Area(sf) CompurtedVol.(cy) name: a-Yra4-Hour5C5sum event
water level (ft) 478.709 at 13.60(hrs) 474•00 2819.00 0.0 Area (acres) 6.a90
_ storage(cy) 669.469 476•00 3748.00 42.4 CN 711
48" RCP RISER 478.00 4799.00 558.2 Type 2
TOP=481.38 / Hydrograph 1 480.00 5977•00 9S6.5 rainfall, P CN 3.5+0
_ INV 1N=478.59 4" PVC (NW l 2-W 24-Hour SCS storm event 482.00 7264.00 14411 time of cone (hrs) o.3600
I Inflow (Cfs) 8.231at 1202 (hrs) 4450 8353.00 1".6 time increment (hrs) o o2oo
INV 1N=473.74 3- PVC
(NW)
6S discharge (cfs) o.610 at 13s2 fhrs) time limit (hrs) 3o.00o
BOTTOM OF STRUCTURE=468.48 I 1 ROCK water level (ft) 479.o12 at 23.2a (hrs) StwLElevatlODM 474-00 V0L(cy) 0.00 fudge factor 1.00
TOP OF TRASH RACK=483.69 1 I ARMOR MMe(cV) 748.712 peakfmuted true
1 7440
MHD I l r Hydrographs peaktlme(hrs) u.oa8
"/
TOP=509.52 24 HDPE 24 "HDPE _ 1o•Yr24-HourSCSstDn, event volume(cy) 1156.3go
INV IN=488.69 24" HDPE (SIN) INV=483.98 _ -480 - _ \ \ INV=468.69 inhowfch) 16444at 22.02(hrs) 5 Outlet Structures Outlet structure 3
- - \mow Aj ` - - dlacharge(ds) 5.o33at u.4o(hrs) outletstnrctureo weir Hydrographs
INV OUT=488.55 24" HDPE (SE) _ - - - - - - \ 9� o _ Culvert name Existing Emergeray5pihvay SCS
waLerkval(fq 481.5g1at 12.4o(hrs) �ngth name:rYra4-HourSCSstortnevent
\ \ 4 .4\ �� - _ _ 1 starage(cy) 1338.076 name. Barrel idea angle
e0000
' - ROCK mule 1 skkan k 6
_ Pk 9 3.430 Area (acres) 6.1go
H d h discharge 0utofdser coefRclarrt 3.000 CN 76.400
> > _ / 2 /ri.• ARMOR y �aP 3 D(In) 15.000 Invert(ft) 482.x o
-480�' too-Yr2 HourSCSstormevent 5 Type 2
4_80_ = Oa - `48t _ InflOw(cfs) 32.749+t 32.o2(hrs) h(M) aaoo mukipk 1 raInFN4P(In) 3.700
- - - discharge (as) 2g.o81 et u.o6 (hrs) Length (ft) 78,000 discharge through dam time of conc. (hrs) o.360o
--0.0200
= 47j- 48� // 4 ' 48�5 waterkvel(f a 482-367 at =o6 fhls) ManningSlo's n 0 .013 Outlet structure 4 ooS timetime I (hrs)) 3o.000
l storage (cY) 546.566
Inlet Calif. Ke O.goO OfiflCe fudge factor 1.00
_ 3 nane:RAISED Existing Rlur routed true e Equionconstardset
vqbG�Invert(ft) 469.000 area(50 12.566 peakflow(cfs) 8. 473.6' I 500
diameter or depth On) 48,E peektlme(hrs) 12-os8
Outlet structure 1 width for moct On) 0.000
volume
1a
79.597
_ _ _ 473.3' a36� Orifice coefficient a5oo473.4'
\\ ROCK
\\\\\ cr I I I ARMOR name: NEW Low -Flow Orifice invert f481 Hydrogreph 2
24"HOPE area (A oo34 multiple 1 SCS
473.5' dlameterordepth(n) 2.500 discharge Into rim name. io-Yr 24-HourSCS storm
event
\ �\ \\ \� \ \\ 1 \_ -\ - ///// -' i wldtlhfor rect.
ient a000 Arca(acros) 400
\ \ \ 1 \ 1 1 1 k _- // / / / // / / coefficient o.60o CN 76.4ou
- 475 / / / / / ,
2 _ - _ /i / / /i / %_ �= Invert (ftJ 474.00o Type a
- - - - - = - - �'¢ / '/ s� MHD mult( le 1 rainfall, P (in) 5,600
480_--- - - �- P
` \ \ \ \ \ \ \ \ _ _ _ _ _ - _ _ _ = S' D _ _ / /// / i / / TOP=493.44 discharge Into riser time of conc. 01 time increment (hrs) a�oo
\ 16 l ;g� \ \ \ \ \ \ \ \ a\ \ \ \ \ _ " _ - _ / // / i/ INV IN=482.54 15" HDPE (S)
- / ' / ' ' > INV IN=482.52 15" HDPE (SE) Outlet strhrcbure a time limit (hrs) 30.000
485 - _ _ : / / / Orifice fudgefactor 1.00
INV OUT=482.14 15" HDPE NW
( ) name: NEW m1d49owOdke routed true
area 0.087 peakflow(cfs) 26447
i2=
peak time
4.000
- .-495-' /i / diameter
widthforrect�(in)On)
0.000 u (tY)1 =556384
D
)1
--_-_ - _ MHD
- - / coefficient o.600
15"..ems, W ..
�_ j \ ice,%'---_--__=_ _ _ __ _ - _ -- i i I I1 R'h�£ ••�. TOP=484.98 Invert(ft) 478.500 IiYdro9r+Ph3
f - SCS
c - MHD - y0� I - -- _-a - - - - _ _ i - lNV 1N=481.64 18" HDPE (SE) multiple a
- - 5 - _ r name: soo-Yr 2 -Hour SC5 storm event
TOP=509.32 MHD 00 - - ^ discharge into riser 4
_ - _ INV OUT=47724 18" HDPE (NE) Area (acres) 6.190
INV IN=488.88 15" HDPE (SE) TOP=502.21 CN 76 4ao
Lk
J INV IN=488.92 15" HDPE (NW) INV IN=491.40 15" HDPE (SE) EhfT�4! y 60I* I -TOP-500.20 Type 2
INV OUT=488.7724"HDPE (N f . V.OUT 491.37 15." HDPE NWT , +�((K f - fU ''�/ ^ I INV IN=492.72 15" HDPE (SW) �"fdl, Pm) 9.000
,... V OUT 492 65 15" HDPE (NW)`
me cone rso.3
time Increment (hrs) 0.0200
time limit (hrs) 30.000
fudgefa for 1.00
routed true
peakflow(crs)
32-755
wA RSHED SUMMMY peaktime (hrs) u.o1=.o:L
8
vollane(cy) 5091.292
IV'PIf4YED IrfC-IAaalQplMM
nrrr+_
.-. _..
,_ _.
,...••.,-..--..,..r..... ......
1-year Flow, 2-year Flow, 101ear Flow,
Area,
1-Vear Flow,
2-MrFlow,
10,mr
CN
Am,
1-year Flow,
2-yeer Fbw,
101=r
CN
Met, tR
ds ds I rs
ON
as.
ds
ds
Flow, cis
ao.
crs
Crs
Flow, i::h
DAW
8LS
L91
0.46
0.78
5 T8
76A
6.19
OAS
0.61
5 �
DA*W
57.9
1L01 3.06 &93 14.39
7L9
3.28
DA C
63.S
4.82
Lse
3.31
8 50
85
4.82
LN
3.11
LSD
Tatelm 1Lo1
Toulon
1LM
3.03
in
1A.28
Tatelh
SLM
3.03
3.72
13.53
Aral of
Elevation
Detmiltim Ce8
Vblume
Q
cor"M
474
2,819
0
476
3,749
11046
480
son
2s
482
7,264
39,045
Q
DETENTION CELL MAINTENANCE ` T� YY'Y��
2. DETENTION BASIN SHALL BE MAINTAINED IN ACCORDANCE WITH THE MINIMUM REQUIREMENTS DESCRIBED BELOW. +�
1. MAINTENANCE SHALL OCCUR ANNUALLY EACH SPRING, AND AFTER THE INITIAL 6 MONTHS FOLLOWING COMPLETION OFTHE BASIN's CONSTRUCTION.
3. EACH MAINTENANCE INSPECTION SHALL INCLUDE:
3.1. VISUAL INSPECTION -ENSURE THE BASIN FLOOR AND SIDE SLOPES ARE STABILIZED WITH A VEGETATIVE GROUND COVER. THIS MAY INCLUDE MULCH,
GRASS OR SHALLOW ROOTED PLANTS SUCH AS JUNIPERS. TREES ARE PROHIBITED WITHIN 25' OF THE RISER AND EMBANKMENT.
3.2. CHECK FOR SEDIMENT BUILDUP OR TRASH AND REMOVE IT
3.3• INSPECT BASIN SIDE SLOPES FOR EROSION AND REPAIR
3.4. CHECK INFLOW POINTS FOR CLOGGING, REMOVE ANY SEDIMENT
3.5• LOOK FOR BARE SOIL IN CONTRIBUTING DRAINAGE AREA, AND STABILIZE IMMEDIATELY
3.6. SPOT RESEEDING - IMMEDIATE STABILIZATION OF BARE OR ERODING AREAS WITH GRASS COVER
3.7. REPLACE ANY DEAD OR SALT KILLED PLANTS AND GRASS
ftamRax'
MUMUMITRMHMICK
Q'(?NMI_-Tr iMAr7H()LE
DIMENSION5 IN i
!lure Bilaiatlanl,ls� I sty
rDw+tslsltriasTs►ar�s
TOP OF
TRASH RACK=
483.69
81DEi IEW
A
BASIN NOTES:
i. STATE APPROVED TRASH RACKS SHALL BE INSTALLED ON ALL ORIFICE OPENINGS.
N SHALL ADHERE TO ALL OSHA REQUIREMENTS. ADDITIONALLY, SPECIAL ATTENTION SHALL BE GIVEN TO THE CONSTRUCTION
SHORING ASSOCIATED WITH THE BK)RETENTK)N BASIN EXCAVATION.
APPROVED/E
240 HDPE 8.57 LF (
!Y'YYw''rc�
AMENDED/PR(
C s H DPEsF
4
11706 2
BOLD AND OR BOXED
INFORMATION IS
AS -BUILT
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TRASH RACKS TO BE INSTALLED ON ALL ORIFICES PER VBMH
TECHNICAL BULLETIN f9. RISER ORIFICE COEFFICIENT - 0.0
S10
510
am
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AMENDMENT#2
505
�
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INV OUT:r526=59 TO 4m
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STR:2 MH
TP=493.75
IN -488.95 TO 4
N: 488.95 TO 16
)UT: 488.85 TO
%;5
495
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V
490
490
485
485
m
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9+75 10+00 xx+oo 12+00 13 13+75
STR2o-STR2
505
9+75 20+00 22+00 12+00 13+00 14+00 15+00 16+oo 16+50
STR34—OUT
515
510
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0 0 L,
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0° co d
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495
SEE:VSMP
AMENDMENT#2
490 - v
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1A.52 L
INV. QUT=488'Bo 24" CL III RCP
4e5 I 8.57 LF 190.58%
Go
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9+75 20+00 11+00
9+75 10+00 10+75
STR24-STR8
CLI
tLF
STRao D 1-38; L=4!
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TP=
508.82
t:
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INV IN:
OUT: 02.6 TO 8
502.18
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-
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TP= 503.06
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INV IN:
497.20
u~i
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INV IN:
493:92
INV OUT It TO 6
J
'4 -0
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15" CL I I I
ys �s LF
15" CIL IIIitEP �
�7gLF(al3.xa96 3.74%
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12+00 13+00 14+00
STR14-OUT
VERTICAL GRAPHIC SCALE
( IN FEET )
1 inch - 5 rt.
HORIZONTAL GRAPHIC SCALE
( IN FEET )
1 inch = 50 ft.
Soo
i�lll■
9+75 =+00 11+00 11+25
STR36-STR26
NOTE: 3' MINIMUM COVER REQUIRED
OVER DRAINAGE PIPES.
cl-0
515
510
505
495
490
485
O m
in vN
� In
15+00 16+oo 17+00
495 495
STR:28 DI-3Ci L=6'
TP- 489.41
484.24 INV�N {�8y 58 TO 38 STR:38 DI-3C• L=1 '
483.6l�11+lV'"�: 48 too30 TP= 489.56
INV OUT:4r93 6D-TO z6 `INV OUT: 484,74,TO 28
NOTE: CONTRACTOR SHALL PLACE FILL UNDER INLETS) AT 95%
COMPACTION & EMBANKMENT MATERIAL SHALL CONSIST
PREDOMINANTLY OF SOIL AND BE PLACED IN SUCCESSIVE
UNIFORM LAYERS NOT MORE THAN 8" IN THICKNESS BEFORE
COMPACTION IN ACCORDANCE WITH VDOT 2o07 ROAD & BRIDGE
SPECIFICATION 3o3.o4. AFTER 3' VERTICAL PLACEMENT OF FILL,
CONTRACTOR SHALL EXCAVATE RECENTLY LAID FILL AND INSTALL
COMPACTED VDOT STD. 21A STONE IN AN 8 xB' O.C. COMPACTED
21A AREA CENTERED ON THE INLET(S). CONTRACTOR SHALL
REPEAT THIS OPERATION UNTIL AN 8'x8' O.C. COMPACTED 21A
STONE BASE IS INSTALLED BETWEEN THE EXISTING GROUND AND
THE PROPOSED INLET(S) BASE IN EFFORTS TO REDUCE THE RISK OF
SETTLING. CONTRACTOR SHALL PROVIDE VDOT WITH FILL
COMPACTION RESULTS PRIOR TO ROAD ACCEPTANCE.
NOTE: HDPE IS AN ACCEPTABLE
SUBSTITUTION FOR RCP STORM PIPES
9+75 10+00 10+75
STR38-STR28
0.72%
NOTE: ALL DRAINAGE STRUCTURES WITH A DEPTH
OF 12' OR GREATER SHALL HAVE SAFETY SLABS IN
ACCORDANCE WITH STANDARD SL-x AS FOUND IN
THE 2oo8 ROAD AND BRIDGE STANDARDS.
NOTE: ALL DRAINAGE STRUCTURES WITH A DEPTH
OF 4' OR GREATER SHALL HAVE STEPS IN
ACCORDANCE WITH STANDARD ST-xAS FOUND IN
THE 2oo8 ROAD AND BRIDGE STANDARDS.
w
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NOTES:
1. ALL FILL TO BE PLACED AT 9S% COMPACTION.
2. MINIMUM 3.5' OF COVER MUST BE MAINTAINED OVER W/L.
3. MINIMUM OF 1' OF VERTICAL SEPARATION FROM STORM
SEWER & W(L AND 1.5' OF SEPARATION BETWEEN W/L &
SANITARY SEWER MUST BE PROVIDED.
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