HomeMy WebLinkAboutSDP200800081 Plan - Approved 2009-09-23Bumper Block to be
Bumper Block Placement concrete or treated timber,
16 ft.) 6 ft. long, anchored at V a r i a b l e
each and by Min. 30" No.
5 Reber.
16 ft
Typical Bumper Block Dimensions and
Designations (nts)
6'0 CONC.
FILLE S'
POST
4-V
GRADE
POURED _"F-C NC. li
T
I v tU
1' - 6'
s
BOLLARD
No scale
Coverages
Buildings /canopy
Parking /Drive /Walks
Open /grass
Total
Existing impervious Coverage:
Proposed Impervious Coverage:
Maximum Structure Height:
Paving Type:
Max. Number of Employees
Predeveloped
Pa rkl ng
Additional Postuevelopea
s.f.s.f.s.f.
8,000 2%3,037 11,037 2%
73,000 16%26,983 99,983 22%
368,376 82%338,356 75%
449,376 100%
8
449,376 100%
18%
25% No Landscaping Plan Req'd at Prelim.
35 ft.
Asphalt or aggregate
50
Van Accessible
Space (8x18 n.) 8 ft.18 ft.
Van Accessible Loading
Space (Bx18 ft.)
18 ft. 8 ft.
Standard Space
9x18 ft.) 9 ft.
18 ft.
Typical Parking Space Dimensions and
Designations (nts)
ALBEMARLE COUNTY
FINAL PLANS NOTES
General Construction Notes
1. Prior to any construction within any existing publiic right -of -way, including connection to
any existing road, a permit shall be obtained from tthe Virginia Department of
Transportation (VDOT). This plan as drawn may nott accurately reflect the requirements of
the permit. Where any discrepancies occur the requairements of the permit shall govern.
2. All materials and construction methods shall coniform to current specifications and
Project: Townsend Landscaping 2008 Improvements
Albemarle County
Owner: J.W. Townsend Landscaping, Inc.
Attn: Jay Townsend
P.O. Box 5551
Charlottesville, VA 22905
Contact: J.W. Townsend Landscaping, Inc.
Attn: Jay Townsend
P.O. Box 5551
Charlottesville, VA 22905
434 - 973 -1154
Tax Map & Parcel:
Pa rkl ng
oln on a way SW of ex. Bldg. -491.5
Acreage:
Ac.Calculation
Deed Book:unk)
0.25 Max No. employees=50.0
2.30 Req'd Parking 1 Space(s) per 1
7.77 or 50.0 spaces
10.32
None
3
File#
Reserwir Watershed:None
Existing Std Spaces ==8
USGS
Existing H.C. Spaces=2
Signature
Stormwater Management Future Buildout: 1
New Std Spaces=47 9'x 18') standard spaces
This current amendment includes a building addition as well as expanded s
New H.C. Spaces=0 8'x 18' with contiguous 8'x 18' Loading area)
parking areas for business operations and employee parking. It is expected t
Total Spaces ProWea.d=57 Parking Spaces
ALBEMARLE COUNTY
FINAL PLANS NOTES
General Construction Notes
1. Prior to any construction within any existing publiic right -of -way, including connection to
any existing road, a permit shall be obtained from tthe Virginia Department of
Transportation (VDOT). This plan as drawn may nott accurately reflect the requirements of
the permit. Where any discrepancies occur the requairements of the permit shall govern.
2. All materials and construction methods shall coniform to current specifications and
Project: Townsend Landscaping 2008 Improvements
Albemarle County
Owner: J.W. Townsend Landscaping, Inc.
Attn: Jay Townsend
P.O. Box 5551
Charlottesville, VA 22905
Contact: J.W. Townsend Landscaping, Inc.
Attn: Jay Townsend
P.O. Box 5551
Charlottesville, VA 22905
434 - 973 -1154
Tax Map & Parcel:TM 32 Parc. 22B
oln on a way SW of ex. Bldg. -491.5
Acreage:10.32 Acres Per previous surrey) / -
Deed Book:unk)
l 1 Y) /1
Submittal TypeZoning:LI
Note: All slopes steeper than 3:1 will require non - grassed
Reviewed and Approved by theMagisterialDistrict:Rivenna District Community Development DepartmOveDistricts:EC (Entrance Comdor) Date C f )0
Waivers Requested None
3
File#
Reserwir Watershed:None
SP -90 -108 C
Datum:USGS
Benchmark0 P ' t W 11,SignaturestandardsofVDOIunlessotherwisenoted. o
Vicinity Map (no s c a I e ) S
oln on a way SW of ex. Bldg. -491.5
3. Erosion and siltation control measures shall be provided in accordance with the approved V Survey: SS.L. Key, Inc.
erosion control plan and shall be installed prior to aany clearing, grading or other TTopographic Information: AAerial
construction. N Note: All slopes steeper than 3:1 will require non - grassed
4. All slopes and disturbed areas are to be fertilized, seeded and mulched. llow maintenance groundcover. Based on the use of this Previous Actions: ZZMA 89 -07 55 ac. From R1 to HI
5. The maximum allowable slope is 2:1 (horizontal:vvertical). Where reasonably obtainable, pproperty it is expected that the applicant will utilize mulch or ZZMA 89 -16 112 ac. From R1 to LI
lesser slopes of 3:1 or better are to be achieved. rrecycled plant materials. SSP -90 -108 CConditions for approval of use6. Paved, rip -rap or stabilization mat lined ditch ma.iy be required when in the opinion of the
County Engineer, or designee, it is deemed necessary in order to stabilize a drainage S Stormwater Management Future Buildout: 11 mmaterial and area devoted t retail sales
channel. T This current amendment includes a building addition as well as expanded sshall be limited to the followi ng: trees mulch,
7. All traffic control signs shall conform with the Virginia Manual for Uniform Traffic p parking areas for business operations and employee parking. It is expected ttopsoil and similar organic materials.
Control Devices. tthat the site will eventually include an additional 7,000 s.f. parking area 22 CComply with ZMA -89 -16
8. Unless otherwise noted all concrete pipe shall bee reinforced concrete pipe — Class III. (see future parking) and additional 3,000 s.f building footprint(s) . The 33 EEquipment and Mulch storage areas shall
f d9. All excavation o r un ergroun pipe Ins a Ia on us co p y r ,
the Construction Industry (29 CFR Part 1926). accordance with Virginia E &S Code and Stormwater Management codes, from adjacent residential lands.
been designed to mitigate the current improvements and the additional SDP - 00-125 Site Plan amendment with
10,000 s.f. of parking area and building footprint. This additional impervious new parking area and equipment storage
area represents potential future improvements that will be considered under shed. Terraced areas, expanded bulk storage
a future and separate site plan application." and expanded water usage.
WF F l FOUNIDAil \
PIO P 40 t,8 I tR Tr$ .l.n''VA kI2' 18 .
EASEMENTS:Stormwater Management Pond Operations Schedule: ' % "' \V ;ouilra+ \ V, i A
from 01 MAY through 01 OCT each year, the BMP orifice I / r '
1 3 s `
ltfni tlhdalv \ -hrt M. Yl:eYrl LNntJ ,.. ` \ ,. \
3" orifice at elevation 428.0) is to be closed with the North ElectricProp. \` ern Piedmont E Cooperativeoerative
structure will be installed up to
expectation that any water collected within the facility c
t DB 483/228
V ..t•rri rY i .4rrra,f . . . r \
i I \ \ \ " \
will be reused as irrigation by the landowner. The weir 5 a 6 \ \, , ' ° , .
1 1
n ° \\ ' "_ '
1 (no width specified; surveyor unable to field
locate)plates on the Agridrain .
0.elevation 432 During the colder months / / — -,,°
d \ \ \, \\ , \
1
01 OCT -01 MAY) the weir plates shall be removed down \ PP —
DB 1246/676
Coov \ Rappahannock Electric Coo
Ire storm storag / '
Ig.to the 428.0 elevation to allow large g / l I i -, \ IShouldCountinspectionsdeterminethatdownstream / , f % + \ t / \ 1 (overhead shown hereon; surveyor unable to
mpletion of the
Y
erosion has been aggravated following co
1 / locate underground)
dam, the County may require the weir plates to be / m ice Authori yremovedoradjusteddowntoelevation428.0. \ Albemarle County Service t
Extended Detentkon Weltpond -DB 1275/185
Vi \ \i an 3'elment Bain (du I1` II
e ry 6riiiflil I Construction)
hut P rl I I I I I I I i I1 1 ,ice
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r ba RloYDB 51aSi i
iI P lees: Vacant Res,dentiWI LardlI
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SHEET NO. 1 OF 3
DWG. N0. 07 -045
Short Version BMP Computations For Worksheets 2 - 6
Albemarle County Water Protection Ordinance: Modified Simple Method
Plan: Townsend SP amendment 2008 Water Resources Area: Development Area
Preparer• JLT Date: 21Aug -08
Project Drainage Area Designation Pond Total
L storm pollutant export in pounds, L = [P(Pj)Rv /12 ] [ C(A)2.72 ]
Rv mean runoff coefficient, Rv = 0.05 + 0.009(l)
Pj small storm correction factor, 0.9
1 percent imperviousness
P annual precipitation, 43" in Albemarle
A project area in acres in subject drainage area, A = 5.27 Approx Total property
C pollutant concentration, mg /I or ppm target phosphorus
f factor applied to RR
V required treatment volume in cy, 0.5" over imperv. area = A(1)43560(0.5/12)/27
RR required removal , L(post) - f x L(pre)
RR removal efficiency , RR100 /L(post)
r....... f` •1r.n l.m1u a in foo4 JL amiss font%
Item- -- -• -- •- -- .- - -- - - - -
I (pre) *Rv(pre)L(pre)L(post)RR
pre- development
Area Type
0.70
Area post - development
0.23
Area
Roads Length Width subtotal
0
1.00
Length Width subtotal
0
2.32
0
Drinking Water Watersheds
0.40
0
1%
0
3.41 1 6.07
0
44%
0
a L
0
Z
0
CD
0
Driveways Length
and walks
Width no.subtotal
0
0
0 0
Length Width no.subtotal
2200
220 10 1 2200
Q
d
0
N Z
01
Parking Lots 1
14000
2 3 4
1 14000
1 2 3 4
414781400020478700010
Gravel areas Area
x 0.70 =12373.9
Area 14677
x 0.70 =
I_
cn
13304.9176774330
Structures
ex office
ex.sheds
Area no.
4970 1
1000 3
subtotal
4970
3000
0 7970
ex.
prop
future
Area no.
7970 1
3000 1
3000 1
subtotal
7970
3000
3000 13970
Actively- grazed pasture &
yards and cultivated turf
Area
0 x 0.08 =0 Remainder
Area
0 x 0.08 =0
Active crop land Area
x0.25=0
E
Area
Ix 0.25=0
Other Impervious Areas
E
0
IZ
0
0
Impervious cover
I(pre)
Agri Drain , Bar Guard
trash Rack
36" (Model BG36)
or approved equal)
Agridrain
7-800-2324742) \
Top of Riser = 432.0
Rv(post) I V
0.331 109.5
Now rlavalnnmant /Fnr navainnmant Aran_ aYistinn impervinus cover <= 200M
Pond Road
Prop +Future
2x WQV Req'd -
109.5 C.Y x 2= 219
CY= 5913 CF req'd
4 ft. pond vol
provided =
18,900 C.F.
8" x 6 ft. (deep) lnline
water level Control
Structure
Agri -Drain
1 -800- 232 - 4742)
8 ft. Top Width 434••0
20' Emergency Spillway _
X433.0E10032.6EI' 1!?
m
i
3' 3' Glavanized antiseep collars (sealed to barrel)
6 x 6 x IS Concrete Antifloatation base
L.F. -18" ADS -N12 @ 0.2%
Stormwater Management Pond (nts)
Prop.
Future
2bo:, 2131
WF rrV CSF VBlOIIN1Y FOUNDATI
d: III
WUfl X40bz18Q1 gLtrPr$ -.tl vn029doaaila Stormwater Management Pond Operations Schedule:
i '
M
K,O from 01 MAY through 01 OCT each year, the BMP orificeIh?ar,
DU 29, `c Sw ` ,u - ` \ \ \ / \ ( 0 428.0 is tomaa \ \`\ \ \ 3 orifice at elevati ) be closed with the
Prop.'sttbK*at6r Man emeateasemont
post) / / e69 0o 1 \ \ ; AA / \ A expectation that any water collected within the facility
I ct!' _ , ,1 will be reused as irrigation by the landowner. The weirvvv" A
g6• \ \ - \ v
V
mem M1 1
NMI
V 1 plates on the Agridrain R structure will be installed up to
icy' elevation 432.0. During the colder months
01 OCT -01 MAY) the weir plates shall be removed down
d \
C f I (pre) *Rv(pre)L(pre)L(post)RR RR Area Type
0.70 1.00 20%0.23 7.45 10.62 3.17 30%Development Area
0.35 1.00 0%0.18 2.99 5.31 2.32 44%Drinking Water Watersheds
0.40 1.00 1%0.18 3.41 1 6.07 1 2.65 44%Other Rural Land
to the 428.0 elevation to allow large storm storage.
ToMet Removal Rate / b `<'.r \' ''• Should County inspections determine that downstream
Proposed detention pond % 1 erosion has been aggrevated following completion of the
dam, the County may require the weir plates to be
min. values / i / / / removed or adjusted down to elevation 428.0.
d5' fi A' v 1 Extended Detentign etl and
Redevelopment (For Development Areas, existing Impervious cover > 20/4
C f I (pre) * Rv(pre)L(pre)L(post)RR RR Area Type
0.70 0.90 20% 0.23 7.45 10.62 3.92 37%Development Area
0.35 0.85 0% 0.18 2.99 5.31 2.77 52%Drinking Water Watersheds
0.40 0.85 1 % 0.18 3.41 6.07 3.17 52%Other Rural Land
I ,so4o a wnvt nrm ¢ vnY
rfnV7) 22831 / /! -
I
o lhatr:ct
Utl 609/276 J
ITUnertY C rylle Family I
I
I I i .... - ........................................I'l ...... I
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N 3• i 8"I I lI
TMP 03200 00 D22L1
1 I wF Par:>..nUNN, rKwu.uaL
5<n I I \ 1 1 I I _ - and sediment Basin (flu ire' \ , Isev- / \
6V I 1 e R dI
I " 111 '
I
Constru ) \A I i I I 1 Jlrsirffll I I
FutFr ! Pr
e YlholtbiInterimManual, Page 70 rev. 16 Feb 1998 GEB \ 1 1 1sI
t bl d' lap 4II1I \ 1 I
N
o A 8ro 03200-0 1 1
1 W IVl? I• Y O1 V1011j, NU 10 / / - A I ! ' '. I A _ - - - Sediment WIF TMP
8 °
l)(JIVERSITY OF VIR0INIAUNDATION 1 bP BOX 400218 CHARLO 9VILLE VA 044f219 I I \oreba 1V
I 2 1 3 ./ / 1IDB32511
I i 11 , . / I I - , v Props . R•aaemel
1 v .
8'x8' P 1
I ,
t um and
e'c 3• I 1 l htconroouse for I1I1 \
d J 1 ' Irrigation system. 1
lep 0t I III('
I
I1II ) I I 1 I I A - 10 ft. w o gravel access 1 1
n rn _ .% i rd. W/crcrusher run 1 1nro QtiNIIN -1 ew t7 erN
I
eti. thpr.ru aggrlycte)I y
I/ r , 1 1 11 .
Ex. Bldg.
l l "J Ma grads to be 20X and9I -
s -slop to be 5X
100 1 . _
memo T-70 0
C1 \ / + - ti 1lyona 1 / S6 '21'3 'E
1
1 I \ 1 2 .0 IFutureBuildingi6ait ' I I I
a L.F. - IB "ADS -N7l
3 Grading30' Parkin dgg4ufrx ............. I....... I..... .
M \ V 1 .. v
n -1 1 111 \\ \ \ 1 1 I / I I ;
n for i"-'`: - . \.• ................. sq eldg. B4 ..... I ..... .
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o \ i ffi S , r ci36e stin1O
o Bellard (Oee detail) ',•ti; i i fon sy ilem or1V11IIIybout i/ / \I 1 T!v8' ft. O. ' i - - , /
PQQO V / ' "A, / ', i
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G l i I
lnline water level Control
Structure to be provided
With
Custom Heavy Duty
screen guard with 8 "x3"
reducer for pondside inlet
and Agri -Drain fixtures:
50 L. F- - 8" Sched. 40
PVC drain pipe
throughout.
2) ASCO3 antiseep
collars
RGO85S Ratguard for
discharge
Agri -Drain fixtures will be
used to vary water level
at owner discretion to
427.5 help with mosquito
control and potential rain
event preparation.
425.9
General construction notes for Stormwater Management plans
1. All dams and constructed fill to be within 95% of maximum dry density and 2% 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 riser joints are to be watertight within stormwater management facilities.
3. For temporary sediment traps 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.
Stormwater Management Future Buildout:
This current amendment includes a building addition as well as expanded parking areas for business operations
and employee parking. It is expected that the site will eventually include an additional 7,000 s.f. parking area
see future parking) and additional 3,000 s.f. building footprint(s). The stormwater management basin, along
with drainage improvements have, in accordance with Virginia E &S Code and Stormwater Management codes,
been designed to mitigate the current improvements and the additional 10,000 s.f. of parking area and building
footprint. This additional impervious area represents potential future improvements that will be considered under
a future and separate site plan application."
Stormwater Management Removal Rate:
The removal rate for this project is required to be 30% (See worksheet to left). The required water Quality
Volume (WQV) is calculated as 109 c.f. (see worksheet to left)
Stormwater Runoff Summary Table
J.W. Townsend Landscape
22 -Apr
Drainage
ond reduces 2 yr- event by approximately 6.37 cfs, or 74%
Dond reduces 10 yr. event by approximately 5.07 cfs, or 43%
pV)
Area C"Tp Q2 Q10
N
ac)unitless)min.)CFS)CFS)
Current (predeveloped) Condition 4.87 0.55 6 8.65 11.66
Proposed (Postdeveloped) Condition into Pond 5.25 0.58 7 11.45 15.46
Proposed Discharge (attentuated) from Pond nia n/a n/a 2.28 6.59
ond reduces 2 yr- event by approximately 6.37 cfs, or 74%
Dond reduces 10 yr. event by approximately 5.07 cfs, or 43%
pV)
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SHEET N0. 2 OF 3
DWG. N0. 07 -045
1
1
Sediment \ Forebay o IV
I` need as t r 8ItP y 1 ,t
one l . , Use aorit iI 'll
Ceratophyllum
d r 'ersum)'or ond,
ed (Potamo ' etont
pectinatus) or as agre d
by r n owner o dY
I 1
ifll po ,ctorsr 1
ed ir- en t F 1
G'a b i n b e r
to b61 in8tgl"'led'
L
1
J
Detailed Pond View (1 " =20')
Pond perimeter(3 ft. from normal pool line)
and along inflow channel to be planted as
water Quality Zone 3 - 4. Use Broomsedge
Andropogon virginianus) around perimeter
and Switchgrass (Panicum Virgatum) in and
around rip rap channel approaching pond or
as agreed by owner and E &S inspectors.
There shall be no zone 25, or 6 areas within
this structure.
Recommended Dewatering
System for Sediment
Basins
Adequate Strapping
Cap
Depth
Tack Weld-)
Style Coupling
Perforated polyethylene
drainage tubing.
Dia. as called.
Riser
Dewatering Orifice
Schedule 40 Steel Stub 1 -ft.
Min. Dia. as called.
Note: With Concrete Riser, Use PVC Schedule 40 Stub for
dewatering orifice.
Note: Drainage tubing to comply with ASTM F667 and
AASHTO M294
Wet
Storage
Sediment Forebev Design Criteria: Sediment Basin Design Criteria:
IEISSymbolLegendDrainagearea= 5.25 ac. x 134 c.y. per = 704 C.Y. Min. Total storageDesignCriteria= 0.25 in. storage per acre of imp. area EMERGENCY - 5.25 ac. x 67 c.y. per = 352 C.Y. (9497 c.f.) Wet storagePlantingsarundSPILLWAY5.25 ac. x 67 c.y. per = 352 C.Y. (9497 c.f.) Dry storage
e
Impervious tributary area= 3196 or 71,000 s.f. equivalent e 29variabledethOnRequiredVol.= 1477 C.F. (imperv. area x "/10.252)O Outlet Protection Inflow to Basin
Q2= 11.45 CfsipemeteraII,''be ' Design Depth = 2 ft.
Side slopes of 2:1 Q25= , . iffs
Q10= 15.46 cis
as a eed y Construction Median area= 533 s.f.
G Entrance Provided Volume= 1599 c -f.. .K. TOP OF
Q100= 21.36 cfs
Owrier d&
Top Elev.z 732.0 EMBANKMENT- Riser- 36" CMP fitted for connection to outfall pipe
I S Ele BARREL Outfall Pipe= 50 L.F. -18" ADS -N12 @ 0.2%tors.r 1 Bottom Elev-
Emergency Spillway= 20 ft. grass linedN
RISERWITH Anti- floatation Plate= 72" x 72" x 18" Concrete
n Q SB Sediment Basin TRASH RACK Dawater ng Device: 6" Dia. pipe (See detail on Narrative)
STABLILIZEDOrifice Size: 3" Dia.SEDIMENT Pr e C
SIN OUTLET
1
Anti -Seep Collars: 36 "x 36" sealed watertight to barrel > Ja \ SEDIMENT BA
Dewatering Office Calculations:
a
Culvert inlet
FOREBAY
h=(431-429y2= 1.0 faroLLProtectionGabiC.FS= 10,422 C.F.
e Baskets Q= 10422/21600 =0.48 cis
A= Q/(64.32 x h/2) ^0.5 x 0.6 LR HILLPLANN =0.05 s.f. required uHr
Diversion _
f
d= 2 x (A/3.14159)"0.5= +/ -3" 'II
Dike Top Width Per VESCH add min. 2 "... use 6" pert. pipeEMBANKMENT
TRASH RACK EMERGENCY, - STABILIZED WITH Elevations:
SPILLWAY VEGETATION Anchor base= 424.5
rte ELEVATION Pond Bottom =426.0 ACRESSFSiltFence
h t ; -
CLEANOUT --
J- FREEBOARD Outfall= 425.9 emMARK -
0.6 MINIMUM top of berm -434.0
emergency spillway=433.0ILimitsofDewateringElev. 2 earevent= 432.43 ayTyrj -INLET SELECTEDFILL y •n / Q C ELEV 10 ear event =432 52may, i OnstrUCtion - P4ACErD IN LAYER - y
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ORIFICE ELEV. -
Orifice Elevation 0428.0 Vici
POND BOTTOM
Dewatering Elevation= 431.0
11111111111111111111 B Blanket c& matting Wet Storage Elev.= 429.0 ( +1-386 C.Y.) OK
Dry Storage= 431.0 ( +1-403 C.Y.) OKIor2 )
See ) Dimensions: see grading Ian for sha 1 AAntiSeeCollas ( 9 9 P
ANTI - FLOTATION -SECTION - outfau Pipe outlet Protection:
n / Q PS Permanent PLATE d50= 6 in.
Seedi NOTES: depth= 12 in., zLLa= 12 ft.
Width Upper= 5 ft.
t j 1. THE SEDIMENT BASIN WILL BE CONVERTED TO A PERMANENT WATER QUALITY ¢
x cm6
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Width Lower = l5 ft. re ZSTRUCTURE (EXTENDED DETENTION WITH UNDERLYING PERM. POOL). N - ;1 E O
n / a O Mulching 2. Trash Rack to be appropriate diameter Agridrain brand (1 800- 232 4742 Heavy Duty Bar Embankment Fill slopes= 3:1 t, CLGuard). Internal Pond slopes= 2:1 =E
3. Riser to be Corrugated metal pipe welded to the anchor -plate and fitted with outlet flange to
connect outlet pipe at prescribed elevation.
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Orifice Elevation 0428.0 Vici
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11111111111111111111 B Blanket c& matting Wet Storage Elev.= 429.0 ( +1-386 C.Y.) OK
Dry Storage= 431.0 ( +1-403 C.Y.) OKIor2 )
See ) Dimensions: see grading Ian for sha 1 AAntiSeeCollas ( 9 9 P
ANTI - FLOTATION -SECTION - outfau Pipe outlet Protection:
n / Q PS Permanent PLATE d50= 6 in.
Seedi NOTES: depth= 12 in., zLLa= 12 ft.
Width Upper= 5 ft.
t j 1. THE SEDIMENT BASIN WILL BE CONVERTED TO A PERMANENT WATER QUALITY ¢
x cm6
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3. Riser to be Corrugated metal pipe welded to the anchor -plate and fitted with outlet flange to
connect outlet pipe at prescribed elevation.
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1. Set the stakes.
6' Max
Flow
3. Staple filter mater' - iI to stakes
and extend it into the trench.
4. Backfill and compact
the excavated soil.
Sheet Flow Installation
I- - *'
Points "A" should be higher than Point "B"
Drainageway Installation
Sit Fence Instal ction
A
MS -7 Cut and fill slopes shall be constructed in a manner that will minimize erosion. open a are g
excessively within one year of permanent stabilization, shall be provided with additional slope stabilizing measures until the problem is corrected.
MS -8 Concentrated runoff shall not flow down cut or fill slopes unless contained within adequate temporary or permanent channel, flume or slope
drain structure. GENERAL REMARKSMS -9 Whenever water seeps from a slope face, adequate drainage or other protection shall be provided.
MS -10 All storm sewer inlets that are made operable during construction shall be protected so that sediment -laden water cannot enter the 1. Lime shall be app 11 at 3 tons per acre unless otherwise noted,
2. Fertilizer shall be Type ]I0-20 -10 unless otherwise noted,
conveyance system without first being filtered or otherwise treated to remove sediment.
MANAGEMENT STRATEGIES
o
1. Areas which are not to be disturbed shall be clearly Marked by flags, signs, etc,
permanent channel lining shall be installed in both the conveyance channel and receiving channel.
at the owner's discretion.r r i v e 2. The Contractor shoill be responsible for the installation and Maintenance of all
stabilize the work area to the greatest extent possible during construction. Nonerodible material shall be used for the construction of causeways and
erosion and sediment control Measures.
PROJECT DESCRIPTION:
The purpose of this project is the addition of parking and drive areas and the permanent stormwater management facility. Approximately 4.1 EROSION AND SEDIMENT CONTROL MEASURES
MS -13 When a live watercourse must be crossed by construction vehicles more than twice in any six -month period, a temporary stream crossing
Measures shown oni the accompanying drawings are to be Installed Inacresarescheduledfordisturbance.accordance with the speclifications and standards of the Virginia Erosion and
MS -14 All applicable federal, state and local regulations pertaining to working in or crossing live watercourses shall be met.
Sedimentation Control Handlbook, 3rd Edition 1992,EXISTING SITE CONDITIONS:
d
The topography of the site is rolling within all reaches. The area landcover is partly wooded with most clearing already completed.
For Planting Dates of May 1 to Aug. 31
criteria:
MAINTENANCE
a. No more than 500 linear feet of trench may be opened at one time.
In general, all Erosion and Sediment control measures will be checkedADJACENTAREAS:
The area is bounded by U.S. 29 to the East and by unimproved or rural properties on all other sides.dally and after each signlflicant rainfall. The following Items will be checked In particular;project a) should sediment basins ior traps be required, they will be cleaned and maintained
approved sediment trapping device, or both, and discharged in a manner that
according to the Virginia Errosion and Sediment Control Handbook.SOILS:b) All gravel outlets will lane checked regularly for sediment buildup thatSoilsinthisareaaregenerallydescribedasHayesAsheChester.will prevent drainage. If tlhe gravel Is clogged by sediment, It shall be
e. Applicable safety regulations shall be complied with.
removed and cleaned or replaced,CRITICAL AREAS:
Critical areas are those (such as creek channels) subject to concentrated stormflows or subsurface springs. In topography such as this,c) All silt barriers will be checked regularly f or undermining or deterioration
source control of sediment is critical to erosion control. Contractor should use care in scheduling and sequencing to minimize excavation exposure in of the fabric and repaired as required. Sediment shall be removed when
E
the level of sediment deposition reaches half way to the top of the barrier,
these areas.d) All Seeded areas will be! checked regularly to see that a good stand is
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maintained, Areas should bee fertilized and reseeded as needed.
EROSION AND SEDIMENT CONTROL MEASURES:
Measures shown on the accompanying drawings and in this narrative are to be installed in accordance with the specifications and standards of e) The acceptance of approval Implies that the applicant has agreed to use
the Virginia Erosion and Sedimentation Control Handbook, 3rd Edition 1992.the materials as Indicated con the Erosion Control Plan, attachment
0
and samples submitted, Any change to the approved design or materials will
p Q
require approval by the Engineer.
STABILIZATION PACTICES
Adapted from State Minimum Standards as effected, 13 SEP95). Standards listed here, are in summary form. In cases of question or controversy,CALCULATIONS,
the Virginia Regulation VR 625 -02 -00 shall govern.
None.
MS -1 Permanent or temporary soil stabilization shall be applied to denuded areas within seven (7) days after final grade is reached on any portion PERM. SEEDING SPECIFICATIINS1 (All units In Pounds per acre)
of the site, Temporary soil stabilization shall be applied to denuded areas within seven (7) days to Feb. 16 thru April 30
Kentucky 31 Fecue- 128 lbs.; Red Top Grass- 2 lbs.; Annual Rye- 20 lbs,denuded areasthat may not be at final grade, but will remain dormant for longer than 30 days. Permanent stabilization shall be Fertilize at 1,000 lb pier acre or as determined by soil testappliedtothoseareaswhichwillremaindormantforlongerthanoneyear.For Slopes steeper thhan 311, add 20 lb. CrownvetchMS -2 Soil stock piles shall be stabilized or protected with sediment trapping measures. The applicant is responsible for the temporary protection May 1 thru August 15andpermanentstabilizationofallsoilstockpilesonsiteaswellassoilintentionallytransportedfromthesite.Kentucky 31 Fecue- 128 lbs.; Red Top Grass- 2 lbs.; Foxtail Millet- 20 tbs,MS -3 A permanent vegetative cover shall be established on denuded areas not otherwise stabilized. Permanent vegetation shall not be considered Fertilize at 1,000 lb pier acre or as determined by soil testestablisheduntilagroundcoverisachievedthat, in the opinion of the local program administrator, or his agent, is uniform, mature enough to For Slopes steeper tMhan 3 add 20 lb, Crownvetchsurvive, and will inhibit erosion.
MS-4 Sediment basins and traps, perimeter dikes, sediment barriers and other measures intended to trap sediment on -site must be constructed as Aug, 16 thru Oct, 311
w 0
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Kentucky 31 Fecue- 128 lbs,1 Red Top Grass- 2 lbs,1 Annual Rye- 20 lbs.a first step in grading and be made functional before upslope land disturbance takes place.Fertilize at 1,000 lb, pier acre or as determined by soil testMS -5 Stabilization measures shall be applied to earthen structures such as dams, dikes and diversions immediately after installation.For Slopes steeper tMhan 311, add 20 lb, CrownvetchMS -6 Surface runoff from disturbed areas that is comprised of flow from drainage areas greater than or equal to, three (3)Nov. 1 thru Feb, 151acres, shall be controlled by a sediment basin. The sediment basin shall be designed and constructed to accommodate the anticipated sediment Kentucky 31 Fecue- 128 lbs.l Red Top Grass- 2 lbs.; Winter Rye- 20 lbs.loading from the land disturbing activity. The outfall device or system design shall take into account the total drainage area flowing through the Fertilize at 1,000 lb, pier acre or as determined by soil testdisturbedareatobeservedbythebasin.
SI th t found to be erodln For Slopes steeper tihan 311, add 20 lb, CrownvetchMS -7 Cut and fill slopes shall be constructed in a manner that will minimize erosion. open a are g
excessively within one year of permanent stabilization, shall be provided with additional slope stabilizing measures until the problem is corrected.
MS -8 Concentrated runoff shall not flow down cut or fill slopes unless contained within adequate temporary or permanent channel, flume or slope
drain structure. GENERAL REMARKSMS -9 Whenever water seeps from a slope face, adequate drainage or other protection shall be provided.
MS -10 All storm sewer inlets that are made operable during construction shall be protected so that sediment -laden water cannot enter the 1. Lime shall be app 11 at 3 tons per acre unless otherwise noted,
2. Fertilizer shall be Type ]I0-20 -10 unless otherwise noted,
conveyance system without first being filtered or otherwise treated to remove sediment.
M
MS -11 Before newly constructed stormwater conveyance channels are made operational, adequate outlet protection and any required temporary or
O
permanent channel lining shall be installed in both the conveyance channel and receiving channel.TEMP, SEEDING SPECS,MS -12 When work in a live watercourse is performed, precautions shall be taken to minimize encroachment, control sediment transport and For Planting Dates of Sep. 1 to Feb, 15stabilizetheworkareatothegreatestextentpossibleduringconstruction. Nonerodible material shall be used for the construction of causeways and Use a 50/50 Max of Annual Rye and Winter Ryecofferdams. Earthen fill may be used for these structures if armored by nonerodible cover materials.at 50 to 100 lb, per acre,MS -13 When a live watercourse must be crossed by construction vehicles more than twice in any six -month period, a temporary stream crossing
H CD
constructed of nonerodible material shall be provided.For Planting Dates of Feb, 16 to April 30MS -14 All applicable federal, state and local regulations pertaining to working in or crossing live watercourses shall be met.Use Annual Ryegrass at 60 to 100 lb, per acre,MS -15 The bed and banks of a watercourse shall be stabilized immediately after work in the watercourse is completed.
d
MS -16 Underground utility lines shall be installed in accordance with the following standards in addition to other applicable For Planting Dates of May 1 to Aug. 31
criteria:Use German Millet at 50 lb, per acre,
a. No more than 500 linear feet of trench may be opened at one time.
b. Excavated material shall be placed on the uphill side of trenches.
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c. Effluent from dewatering operations shall be filtered or passed through an
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approved sediment trapping device, or both, and discharged in a manner that
does not adversely affect flowing streams or off -site property.
d. Restabilization shall be accomplished in accordance with these regulations.
00
e. Applicable safety regulations shall be complied with.
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A bl A. shall be made to minimize the transport of sediment by
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Mulch Specifications
Strain or ,fay- 1.5 to 2.0 ton per ac. (2.0 min. for winter corer)- free from weeds and coarse
matter. Must be anchored. Spread by hand or Waver.
Fiber Mulch- Min. 1500 Ile. per acre- Do not use as winter toff or during hot, dry periods•
as Am.
Cam Stalks - 4 -6 tan per axe- Cut or shredded into 4-6' lengths. Air dried. Do not use lei
fine hxf oreos. Apply by hand or blower.
Wood Chips - 4-6 ton per acre- Free of coarse matter. Air dried. Treat with 12 lb. nitrogen /ton
Do not use in fine turf areas. Apply by hand, blower or chip handler.
Bak Clips or
Shredded Bak- 50 -70 C.Y. per acre- Free of Coarse matter. Air Dried. Do not use in fine
turf areas. Apply by hand, blare a chip handler
1M m Fleer Mulch le the only awilatle mulch during periods when straw should be used,
apply at rote of 2,000 Ile. per ac.
Earthwork Summary:
It i$ expected th4i the earthworkonthisprojectwllteaonceonsite.
MS -17 Where construction vehicle access routes intersect pave pu is roa , provisions
vehicular tracking onto the paved surface. Where sediment is transported onto a public road surface, the road shall be cleaned thoroughly at the and Generral construction notes for Erosion and Sediment Control plans
of each day. Sediment shall be removed from the roads by shoveling or sweeping and transported to a sediment control disposal area. Street I. Then plan approving authority must be notified one week prior to the pre- construction
washing shall be allowed only after sediment is removed in this manner. This provision shall apply to individual subdivision lots as well as to larger COnferrenCe, one week prior to the commencement of land disturbing activity, and one weekland- disturbing activities.
MS -18 All temporary erosion and sediment control measures shall be removed within 30 days after final site stabilization or after the temporary prior tto the final inspection
measures are no longer needed, unless otherwise authorized by the local program administrator. Trapped 2. All ierosion and sediment control measures will be constructed and maintained according tosedimentandthedisturbedsoilareasresultingfromthedispositionoftemporarymeasuresshallbepermanentlystabilizedtopreventfurthererosionminimumstandardsandspecificationsoftheVirginiaErosionandSedimentControlandsedimentation.
MS-11S Stormwater management plan for the project details the biofilter retrofits of the sediment traps. The subsequent routing shows substantial Handbook and Virginia Regulations VR 625 -02 -00 Erosion and Sediment Control
decrease in stormwater runoff for the site.RenulOations .
3. Aid ierosion and sediment control measures are to be placed prior to or as the first step in
clearilring.
4. A ccopy of the approved erosion and sediment control plan shall be maintained on the site at
all timnes.
5. Pridor to commencing land disturbing activities in areas other than indicated on these plans
incluoding, but not limited to, off -site borrow or waste areas), the contractor shall submit a
supplidementary erosion control plan to the owner for review and approval by the plan
approving authority.
6. Thee contractor is responsible for installation of any additional erosion control measures
necesssary to prevent erosion and sedimentation as determined by the plan approving
authonrity.
7. All disturbed areas are to drain to approved sediment control measures at all times during
land ddisturbing activities and during site development until final stabilization is achieved.
8. Durring dewatering operations, water will be pumped into an approved filtering device.
9. Thee contractor shall inspect all erosion control measures periodically and after each runoffproducing
rainfakll event. Any necessary repairs or cleanup to maintain the effectiveness of
the erfosion control devices shall be made immediately.
10. AIN fill material to be taken from an approved, designated borrow area.
11. AIIII waste materials shall be taken to an approved waste area. Earth fill shall be inert
rnaterrials only, free of roots, stumps, wood, rubbish, and other debris.
12. Barrow or waste areas are to be reclaimed within 7 days of completion per Zoning
ordinance section 5.1.28.
13. AIIII inert materials shall be transported in compliance with section 13 -301 of the Code of
Alberrnarle.
14. Barrow, fill or waste activity involving industrial -type power equipment shall be limited to
the haurs of 7:00am to 9:00pm.
15. Barrow, fill or waste activity shall be conducted in a safe manner than maintains lateral
suppolrt, or order to minimize any hazard to persons, physical damage to adjacent land and
improwements, and damage to any public street because o slides, sinking, or collapse.
16. The developer shall reserve the right to install, maintain, remove or convert to permanent
stormwater management facilities where applicable all erosion control measures required
by thins plan regardless of the sale of any lot, unit, building or other portion of the property.
17. Temporary stabilization shall be temporary seeding and mulching. Seeding is to be at 75
Ibs /acne, and in the months of September to February to consist a 50/50 mix of Annual
Ryegrrass and Cereal Winter Rye, or in March and April to consist of Annual Rye, or May
through August to consist of German Millet. Straw mulch is to be applied at 80lbs /100sf.
Alternatives are subject to approved by the County erosion control inspector.
18. Permanent stabilization shall be lime and fertilizer, permanent seeding, and mulch.
Agricultural grade limestone shall be applied at 90lbs /1000sf, incorporated into the top 4 -6
inches of soil. Fertilizer shall be applied at 1000lbs /acre and consist of a 10 -20 -10 nutrient
mix. PPermanent seeding shall be applied at 180lbs /acre and consist of 95% Kentucky 31 or
Tall Frescue and 0 -5% Perennial Ryegrass or Kentucky Bluegrass. Straw mulch is to be
applieed at 80lbs /100sf. Alternatives are subject to approved by the County erosion control
inspector.
19. Maintenance: All measures are to be inspected weekly and after each rainfall. Any damage
or cloogging to structural measures is to be repair immediately. Silt traps are to be cleaned
when 150% of the wet storage volume is filled with sediment. All seeded areas are to be
reseeeded when necessary to achieve a good stand of grass. Silt fence and diversion dykes
whichl are collecting sediment to half their height must be cleaned and repaired
immeediately.
20. A111 temporary erosion and sediment control measures are to be removed within 30 days of
final ;site stabilization, when measures are no longer needed, subject to approval by the
Countty erosion control inspector.
Outlet Protection
Filter Cloth--
Key in 6 -9"
recommended for entire perimeter
1. Apron Lining May be Rip Rap, grouted Riprap
Gabion Basket, or concrete.
2. La= length of riprap apron as specified.
3. d= 1.5time max stone diameter but not less than 6 in.
v
1992 3.02
STONE CONSTRUCTION ENTRANCE
EXISTINGl
70' MIN. I
PAVEMENT
EX. GROUND
FILTER CLOTH --"'
6" MIN.
ASIDEELEVATION
70' MIN. -
WASHRACKB (OPTIONAL)
GROUND'/Ni 10 M
MOUNTABLE BERM
OPTIONAL)
z
0
EX.
PAVEMENT
VDOT #1 B POSITIVE DRAINAGE ?
COURSE AGGREGATE SEDIMENT
MUST EXTEND FULL TRAPPING DEVICE o
WIDTH OF INGRESS AND PLAN VIEW
EGRESS OPERATION
12' MIN.
3" MIN.
3 MIN.
FILTER CLOTH SECTION A -A
REI
COI..,1 \L I L JtI.IIUN t3 - t3
I SPACE
SOURCE: VA. DSWC PLATE 3.02 -1
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