HomeMy WebLinkAboutWPO200500026 Plan - Stormwater 2005-06-21E&SC LEGEND
E&SC STD,
6 SPEC
CE
TEMP. STONE CONST. ENTRANCE
3.02
SF
SILT FENCE
3.05
CIP
CULVERT INLET PROTECTION
3.08
DID
TEMPORARY DIVERSION DIKE
3.09
ST
TEMPORARY SEDIMENT TRAP
3.13
TSD
TEMPORARY SLOPE DRAIN
3.15
OP
OUTLET PROTECTION
3.16
CD
ROCK CHECK DAMS
3.20
LS
LEVEL SPREADER
3.21
TO
TOPSOILING
3.30
TS
TEMPORARY SEEDING
3
31
The developer shall reserve the right to Install, maintain, remove and/or convert to Permanent
stormwater management facilities (where applicable) all erosion control measures required
by this plan regardless of the sale of any lot.
N /
/
O /
/
-
Silt Trap #2
VICINITY MAP
Kevlewed a
Drainage Area (ac):
0.33
.
Wet Storage Req (cy):
22.11
Dry Storage Req (cy) :
22.11
708
Date: 221
Total Storage Req (cy),.
44.22
File#: wfl
T 'i
o
Elev Side
1 Side
2 Area
Vol
Vol
_
I C \
(sf)
(cf)
(cy)
9 v
Low Point 734.0
8
B
64.0
\
I I
1: 1 side slope
Bottom of Weir: 738.0
16
16
256.0
640.0
23.7 wet
3: 1 side slope
710
1� ti ti
Top of Weir 739.6
22.4
21.4
501.8
606.2
22.5 dry
\ �P
0
Weir Length (ft) : .
708
29
Ln
�
Weir Height (ft) : 1.6
o
Top of Berm: 740.6
696
0
Top of Weir: 739.6
Berm Width (ft) : 2.5
r \
N Q QQ 5Q
I
SITE
Silt Trap #1
\ \\ Drainage Area (ac): 0.32
PS PERMANENT SEEDING 3.32 Wet Storage Req (cy): 21.44
SO 50DDING 3.33 / / / / %� \ \ Dry Storage Req (cy): 21.44 RED O
MU MULCHING 3.35 I / • \ �� �- o Total Storage Req (cy): 42.88 29 HILL �P
B/M SOIL STABILIZATION BLANKETS/MATTING 3.36 I / / / / / ti ',d 1 �� i J Elev Side 1 Side 2 Area Vol Vol q
DC DUST CONTROL 3.39 I / /
oo71
Va K,4' / �" v
of /
TOCKIL'ILE /
^ / / / / / yQ)
u) _ )
/0
LIMITS OF /
\ DISTURI?�ANCE
I
1
I
1
I
1 5
y
-
/ - - - - _ v 1 O I
d
�A�' P)MP PLANTING SCHEDULE
\ 8 ///`���''''''���
( . .�(6) 1.5• cal Red Maple
• f121 8' mix Borborry/Spico Bush Ibio-filter)
CIO -FILTER
BE�jN1y / �I� \ \ / / / / / \ 4 OR 6' PERFORATED PVC
2I EC-2 \ \ �� / / / / PIPEo POSITVE SLOPE
\ \ \ \ \ \� • \ 2�j�/, / WITH CLEANOUTS EVERY 50'
00
\\ \\ I�
\ \
\ 1
\ \\
,10
\ \ \
\\
\o
T I 1 kSIO-r IL 1 Lk 4 OR 6"NON- PERFORATED PVC
PIPE 0 POSITVE SLOPE
\ \ \ Oy
I 4
01 \ (sf) (cf) (cY) QP�\.
I \\ S T 1 Low Point 734.0 8 7 56.0 760
1: 1 side slope 712
f� Bottom of Weir: 738.0 16 15 240.0 592.0 21.9 wet
-: - r 3: 1 side slope
\ \ Top of Weir 739.7 22.8 21.8 497.0 626.5 23.2 dry SCALE -. 1" = 4000'
\ Weir X Length (ft) : 1 . 9
° \ Weir Height (ft): 1.7
Top of Berm: 740.7
N F�'A Top of We 739.7 GENERAL EROSION AND SEDIMENT CONTROL NOTES
QF.QP\`Q I r Berm Width (ft) : 2. 5
/ �Pg �Q \ ES-1: UNLESS OTHERWISE INDICATED, ALL VEGETATIVE AND STRUCTURAL EROSION AND
cn v SEDIMENT CONTROL PRACTICES WILL BE CONSTRUCTED AND MAINTAINED ACCORDING
O LAG ti TO MINIMUM STANDARDS AND SPECIFICATIONS OF THE VIRGINIA EROSION AND
/ lip p� J SEDIMENT CONTROL HANDBOOK AND VIRGINIA REGULATIONS VR 625-02-00
EROSION AND SEDIMENT CONTROL REGULATIONS.
ES-2: THE PLAN APPROVING AUTHORITY MUST BE NOTIFIED ONE WEEK PRIOR TO THE PRE -
CONSTRUCTION CONFERENCE, ONE WEEK PRIOR TO THE COMMENCEMENT OF LAND
n DISTURBING ACTIVITY, AND ONE WEEK PRIOR TO THE FINAL INSPECTION.
r ES-3: ALL EROSION AND SEDIMENT CONTROL MEASURES ARE TO BE PLACED PRIOR TO OR AS
44 e +b+iftTNIW THE FIRST STEP IN CLEARING.
/ Reviewed and Approved by the ES-4: A COPY OF THE APPROVED EROSION AND SEDIMENT CONTROL PLAN SHALL BE
/ II MAINTAINED ON THE SITE AT ALL TIMES.
Community Development Department ES-5: PRIOR TO COMMENCING LAND DISTURBING ACTIVITIES IN AREAS OTHER THAN
Date: Z ( JUtjF- zoo - INDICATED ON THESE PLANS (INCLUDING, BUT NOT LIMITED TO, OFF -SITE BORROW OR
File#• Z
eo • oos'- c9 WASTE AREAS) , THE CONTRACTOR SHALL SUBMIT A SUPPLEMENTARY EROSION CONTROL
I I I \ PLAN TO THE OWNER FOR REVIEW AND APPROVAL BY THE PLAN APPROVING AUTHORITY.
I / I ES-B: THE CONTRACTOR IS RESPONSIBLE FOR INSTALLATION OF ANY ADDITIONAL EROSION
I I I \ gnatu"e CONTROL MEASURES NECESSARY TO PREVENT EROSION AND SEDIMENTATION AS
DETERMINED BY THE PLAN APPROVING AUTHORITY.
I / \ ES-7: ALL DISTURBED AREAS ARE TO DRAIN TO APPROVED SEDIMENT CONTROL MEASURES AT
1 r
ALL TIMES DURING LAND DISTURBING ACTIVITIES AND DURING SITE DEVELPMENT UNTIL
FINAL STABILIZATION I5 ACHIEVED.
ES-8: DURING DEWATERING OPERATIONS, WATER WILL BE PUMPED INTO AN APPROVED
I \� FILTERING DEVICE.
I \ 1 I I I \ ES-9: THE CONTRACTOR SHALL INSPECT ALL EROSION CONTROL MEASURES PERIODICALLY AND
1 I I I I I \ I\\ AFTER EACH RUNOFF -PRODUCING RAINFALL EVENT. ANY NECESSARY REPAIRS OR
I II J \ CLEANUP
IMMEDIATELY.
SouthTHE EFFECTIVENESS OF THE EROSION CONTROL DEVICES SHALL
BE MADE
1 I
South Fcrk Farms
I Erosion/Sediment Control Narrative
I March 2i, 2005
I 1 PROJECT DESCRIPTION
The project consists of construction of a road for a rural, large lot, subdivision. The total
I I I I I I
drainage area of 3.5 acres.
EXISTING SITE CONDITIONS
The site is mostly pasture.
ADJACENT PROPERTY
TEMPORARY PERMANENT
Sediment Trap To Stormwater BMP Construction Notes
1. All disturbed areas must be stabilized with pavement or
a good stand of vegetation prior to the conversion of the
trap to a stormwater BMP.
2. Accumulated sediment must be removed from the trap to a
depth 24" below the stone weir (see detail), the interior
slopes of the trap regraded to 3:1 or flatter, and the stone
weir repaired if necessary.
3. De -watering Trench shall be installed in accordance with
the attached Sediment Trap to BMP Plan and the De -
watering Trench Detail .
4. After installation of the de -watering trench, the bottom
of the stormwater BMP will be covered with at least 2' of a
50/50 mixture of sand and topsoil, and then permanent seed 6
mulch applied.
CLEAN -OUT
W/WATERTIGHT
CAP 670.0'
-------------
-------------
-------------
--- -------
-------- --- - -- -
i inin Cnnn e Tni r•n n vri
TOPSOIL 6 SAND
SAND: 0.02-0.04"
(ASTM C-33 FINE)
O,(MUST BE INSPECTED BY
WATER RESOURCES MANAGER N
EROSION CONTROL INSPECTOR)
(see note #2 below)
The road enters the project from state route 708 to the east. The rest of the property is
surround,;d by rural parcels: 87-16D, 87-16C, 87-16A1, 87-18&,87-22J and 87-16F.
OFFSITE AREAS
No off -site areas will be disturbed.
SOILS
Braddock. Loam on 7-15% slopes is a deep, strongly sloping, well drained to excessively
drained ;,oil Pound on ridgetops, points of ridges, and on side slopes. The surface layer is
brown sandy loam about 5 Inches thick. The substratum is mostly brown and yellow partially
weathered bedrock that crushes to sandy loam to a depth of about 60 Inches. Permeability is
rapid. and available water capacity is low. Surface runoff Is rapid. The hazard of erosion
is moderate.
CRITICAL EROSION AREAS.
There are no critical erosion areas..
EROSION AND SEDIMENT CONTROL MEASURES
Unless ortierwise Indicated, oil veoetative and st-ucturol ero�ion and sediment control
practice! will be constructed and maintained according to minimum standards and
specifications of tho Virginia Erosion and Sediment Control Handbook (VESCH).
STRUCTURAL PRACTICES
1. Construction Entrance- 3.02
A temporary Construction entrance will be provided upon field determination by the County
and the contractor. A temporary paved construction entrance shall be Installed at the
beginning Of the project.
2. Silt Fence- 3.05
A tbmpoi-ary sediment barrier consisting of a synthetic filter fabric stretched across and
attached to supporting posts and entrenched.
3. TomP orary Sediment Trap - 3.13
A small ponding area, formed by construction an earthen embankment with a stone outlet
across a drainage swolb.
VEGETATIVE PRACTICES
1. Temporary Seeding - 3.31
Establishment of temporary vegetative cover on disturbed areas by seeding with appro riate
rapidly growing plants on sites that will not be brought to final grade for brides of 3
days to one year. Garman Millet at 60 Ib./oc.. Weeping Lovegrass at 3 Pb./ac.. Korean
Lespedozo at 20 lb./ac.
Temporary seeding shall be fertilized. Fertilizer shall be applied at a rate of 600
Ibs/acre of 10-20-10 according to the handbook. The builder may save considerable funds by
having ire soil tested by VA TECH (kits are available at the extension office and the test
costs $6.00).
2. Mulch - 3.35
Organic mulch shall be used In conjunction with seeding operations and shall be applied at
the rate of 2 tons/acrb.
3. Dust Control- 3.33
Dust control Measures shall be utilized throughout this site when necessary. Typlcal
temporary measures include but are not limited to, Irrigation, temporary seeding barriers.
These measures will aid in the prevention of harmful airborne substances as well the effects
of wind erosion
MANAGEMENT STRATEGIES
1. Construction should be sequenced so that grading operations can begin and end as quickly
as possible.
2. Sediment trapping measures shall be installed as a first stop in grading and shall be
seeded and mulched immediately following Installation.
3. The job superintendent shall be responsible for the installation and maintenance of all
erosion and sediment control practices.
4. Temporary seeding or other stabilization will follow immediately after grading.
5. Areas which are not to be disturbed will be clearly marked by flags, signs, etc.
PERMANENT STABILIZATION
All areas disturbed by construction will be stabilized with permanent seeding Immediately
following finish grading. Seeding will be done with Kentucky 31 Tall Fescue according to
Std. 8 Spec. 3.32 of The Virginia Erosion 9 Sediment Control Handbook. 5-20-10 fertilizer
shall be applied at the rate of 1000 lb/ac and lime at 2 tons/ac. Permanently seeded areas
shall be protected during establishment with straw mulch (2 tons/acl.
STORMOATER MANAGEMENT
This is a rural subdivision with negligible change in stormwater peak flows. The large
downstream silt trap will be converted to a bio-filter to address water quality as shown on
the Preliminary plat.
MAINTENANCE
In gbnercll, all erosion and sediment control measures will be checked weekly and after each
significant rainfall. The following items will be checked in particular:
1) The sediment traps and basins will be cleaned and maintained according to the VESCH.
2) All gravel outlets will be chocked regularly for sediment buildup which will prevent
drainage. If the gravel is clogged by sediment, it shall be removed and cleaned or
replaced.
3) Silt Pence will be checked regularl for underminin or deterioration of the fob d
\
r \700. I SILT TRAP / BIO-FILTER
-6 'I UnHII-�
PVC PIPE AT 1%
� � �` BIOFILTER CROSS SECTION
(AASHTO M43, 1/2"-1 ")
y g ria an
repaired as required. Sediment shall be removed when the level of sediment deposition
(converted after stabilization)
SLOPE (MIN)
WRAPPED IN FILTER FABRIC STORMWATER/BMP NOTES
reaches half way to the top of the barrier.
I \ During construction basin will act
oat as silt trap.
1.
BMP
is not to be constructed until the site is adequately stabilized, according to Water Resources Personnel (434-296-5861) .
All sbbdod areas will be checked regularly to see that a good stand Is maintained. Areas
should be fertilized and reseeded as needed.
After site ,s stabilized, basin will be converted to
bio-filter. Silt be
2.
The
bio-filter soil mix must be the Luck Bio-filter Mix available from Luck Stone or a tested and approved equivalent.
MS-1 Stabilization of Denuded Areas and Soil Stockpiles
a to cleaned out. underdrom
I I \ 1 installed, soil mix added and cover installed.
3.
For
The
addional information contact Water Resoruces Personnel (434-296-5861).
sand/soil mix must be stabilized with sod along with the trees and/or shrubs listed on the
Permanent or temporary soil stabilization must be applied to denuded areas within seven days
\ I Bio-Filter Sizing
g plan.
after final grade Is reached on any portion of the site. Temporary soil stabilization shall
9
24975 sf ultimate mporvious02.5x=625 sf roc{
be applied within seven days to denuded areas that may not be at final grade, but will
vided
I I I I I Bio-Filter Hooting
�E�N 1336 sf o 400/ac = 1e loots
I I I I 21 8'cmlix ix IBarrborry/Se/Pir, Oak
co Bush
- - - - - 44 \ _ � \ � WATER - - - _ \ / I I r P
`2 AC d DIVERSION
I I \ _Silt trap during construction. Silt Trap #3 I / Drainage Area (ac) : 2.83
/ / \ After site is stabilized.wrap-wil+-bo-_convortod\to I ) I I I \ Wet Storage Req (cy) : 1B9.61
_ o bio-filter. Silt to bo cleanod out, uppdordroin I Dr Storage Re
instofed"od mix added and cover irlstallod. / / / I \ \ Y g q (Cy) : 179. 61
Total Storage Req (cy) : 379. 22
Elev Side 1 Side 2 Area Vol Vol
(sf) (cf) (cy)
Low Point 666.0 36 36 1296.0
1: 1 side slope
- Bottom of Weir: 670.0 44 44 1936.0 6464.0 239.4 wet
Top ofdWeirope 672.6 54.4 54.4 2959.4 6364.0 235.7 dr
Weir Length (ft) : 21.0
o���PLTH OF t/I9c
W. THOMAS MUNCASTER, JR.
C) CERT. NO. 16242 q
+/z7/os
Top of Berm: 673.E GRAPHIC SCALE 1 "=60 '
Top of Weir: 672.6
Berm Width (ft) : 3.0
0 60 120 180
remain dormant (undisturbed) for longer than 30 days. Permanent stabilization shall be
applied to areas that are to be left dormant for more than one year.
Soil stabilization refers to measure which protect soil from the erosive forces of raindrop
Impact and Plowing water. Applicable practices include vegetative establishment, mulching,
and the early application of gravel base on areas to be paved. Soil stabilization measures
should be selected to be appropriate for the time Of year, site conditions and estimated
duration of use.
MS-4 Timing and stabilization of Sediment Trapping Measures
Sediment basins and traps, perimeter dikes, sediment barriers and other measures intended to
trap sed mont shall be constructed as a first step in any land -disturbing activity and shall
be made functional before up -slope land disturbance takes place.
MS- 5 Stabilization Measures
Stabilization measures shall be applied to earthen structurbs such as dams, dikes and
diversions immediately after installation.
MS- 17 Vehicle Access
Where construction vehicle access routes Intersect paved public roads, provisions shall be
made to minimize the transport of sediment by (vehicular) tracking onto the paved surface.
Where sediment is transported onto a public road surface, the road shall be cleaned
thoroughly at the end of each day. Sediment shall be removed from the roads by shoveling or
sweeping and transported to a sediment control disposal area. Street 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 land disturbing activities.
MS-18 Disposition of Temporary Measures
All temporary erosion and sediment control measures shall be removed within 30 days after
final site stabilization or after the temporary measures are no longer needed, unless
otherwise authorized by the local program administrator. Trapped sediment and the disturbed
soil areas resulting from the disposition of temporary measures shall be permanently
stabilized to prevent further erosion and sedimentation.
lid by the
Department
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DESIGNED
BY
DATE
TM
3/17/05
DRAWN BY
DATE
TM
CHECKED
BY
DATE
FILE
EDIT
South Fork
Farms
-
SCALE
1 " =60
DRAWING
1: 1
PLOT
PROJECT
-
OF 1
SHEET NO.