HomeMy WebLinkAboutWPO201800082 Plan - VSMP 2020-01-29Erosion and Sediment Control Narrative For:
Woodlands Farm
1110 Woodlands Rd.
TM 44 Parcel 1
Albemarle County, VA
HUC: South Fork Rivanna 020802040203
LAT: 380 06' 53"N LONG: 78' 32' 23"W
Project Description: The proposed work involves the demolition of an existing
residence and driveway and construction of a new residence, driveway and
associated site grading required to create a new building pad for the house
and to create a more evenly graded pasture. The property is located on the
north side of Woodlands Rd., about 0.4 mile east of Free Union Rd. The total
area of the parcel is 39.2 acres. The total on -site disturbed area is
approximately 3.9 acres. Work is anticipated to begin in early Spring of 2018.
Erosion control measures shown will protect the stream and property below
from receiving silt -laden runoff.
Existing Site Conditions: The project site area is in an open pasture and
wooded former house site and generally slopes to the northeast at 10 to 15%.
The pre and post drainage patterns will be the some.
Adjacent Property: The property is surrounded by other large acreage farms
and wooded areas.
Off -site Areas: No off -site areas will be involved in this project.
Soils: 36B-Hayesville loam, loamy, 0.28 K-Factor, Group B soil
36C-Hayesville loam, loamy, 0.28 K-Factor, Group B soil
Critical Erosion Areas: There are no critical erosion areas in the project area.
Soil Stockpiles: A temporary soil stockpile will be utilized during the excavation
to preserve topsoil for final grading around the house and driveway.
Erosion and Sediment Control Measures:
Unless otherwise indicated, all vegetative and structural erosion and sediment
control practices will be constructed and maintained according to minimum
standards and specifications of the Virginia Erosion and Sediment Control
Handbook. Additional measures may be required during construction by the
Erosion Control Inspector, as needed.
Structural Practices:
Construction Entrance : (CE) 3.02 (To be installed where construction site traffic exits the project
area, to, remove soil froth tires prior to travel on public roads. The contractor shall clean and
rnaintai;n the travelway as required to keep soil from washing into unprotected areas and to
provide a safe surface for pedestrian and vehicular access. The Construction Entrance will be
located -within the fbotprint of the existing building to protect the adjacent paved travelways.
Once the building is erected, all adjacent areas will be stabilized and the construction entrance
will no longer be necessary.)
Silt Fence: (SF) 3.05 Silt fence (wire -supported) shall be constructed along the lower limit of graded areas.
(To be installed as shown on the plan, down -gradient of disturbed areas created by the proposed
work, and above the proposed excavation to prevent up -gradient runoff from crossing disturbed
areas. )
Rock Check Dain: (CD) 3.20 Small temporary stone darns constructed across a drainage ditch to reduce
the velocity of concentrated flows, reducing erosion of the swale or ditch. Limited to use in small open
channels which dram 10 acres or less; should not be used in live streams. (To be installed along the natural
swales on either side of the grading area to rninirnize runoff velocity.)
Level Spreader (LS) 3.21 An outlet for dikes and diversions consisting of an excavated depression
constructed at zero grade across a slope to convert concentrated, sediment free runoff to sheet flow and
release it into areas of undisturbed soil which is stabilized by existing vegetation. (To be installed at the egad
ofthe roof drains to disperse concentrated runoff)
Permanent Seeding (PS) 3.32 Establishment of pereruiial vegetative cover by planting seed where
perinanent, long-lived vegetative cover is needed on fine -graded areas. (Permanent seeding will be
provided on all disturbed areas designated to be landscaped on the site plan within 7 days of
final grading.)
Mulching (MU) 3.35 Application of plant residues to disturbed surfaces to prevent erosion and reduce
overland flow. Apply to all seeded areas. Refer to Table 3.35-A on Sheet C-3.3 for application rates. (To
be installed along with Permanent Seeding)
Dust Control (DC) 3.39 Reducing surface and air movement of dust during land disturbance, demolition
or construction activities in areas subject to dust problems in order to prevent soil loss and reduce the
presence of potentially airborne substances. (To be installed, if required by the County, where disturbed
soil is to remain unprotected for an extended period )
Vegetative Practices:
Temporary Seeding 3.31: All areas disturbed by construction that will not be
brought to final grade for a period of more than 14 days, will be stabilized
by establishing a good stand of grass.
Lime 3.31: Unless it is known that the site will remain undisturbed for
many months, lime is not necessary. If necessary, the amount will be
determined by Soil Test, or 3 tons per acre of . pulverized agricultural
limestone, uniformly applied to surface to be seeded during seedbed
preparation and incorporated into the top 2-4 inches of soil.
Fertilizer 3.31: 600 pounds per acre of 10-20-10 or equivalent, uniformly
applied to the surface to be seeded during seedbed preparation and
incorporated into the top 2-4 inches of soil.
Surface roughening 3.31: Where disturbed soils have been compacted,
loosen soils by discing, raking, or whatever acceptable means available to
receive seed.
Seed 3.31: Seed shall be broadcast evenly and planted from 'A to X inch
deep. Seasonal seed selection shall be as follows:
• Sept. 1 - Feb. 15: 50/50 Mix of Annual Rye and Winter Rye, 50-100
Ib/ac.
• Feb. 16 - April 30: use Annual Rye, 60-100 Ib/ac.
• May 1 - Aug. 31: use German Millet, 50 Ib/ac.
Areas which fail to establish vegetative cover adequate to prevent rill erosion
will be reseeded as soon as such areas are identified.
Woodlands Farm
VSMP/WP0201800082
Management Strategies: Construction should be sequenced so that grading
operations can begin and end as quickly as possible. Areas that are not to
be disturbed shall be clearly marked by the placement of the erosion control
measures prior to construction. The job superintendent shall be responsible for
the installation and maintenance of all erosion and sediment measures.
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.
Stabilization of Denuded Areas and Soil Stockpiles: Permanent or temporary
soil stabilization must be applied to denuded areas within 7 days after final
grade is reached on any portion of the site. Temporary soil stabilization shall
be applied within 7 days to denuded areas which may not be at final grade
but will remain dormant (undisturbed) for longer than 14 days. Permanent
stabilization shall be applied to areas that are to be left dormant for more
than one year.
Soil stabilization refers to measures that protect soil from the erosive forces
of raindrop impact and flowing 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.
Timing and Stabilization of Sediment Trapping Measures:
Sediment barriers and traps, perimeter dikes, sediment barriers and other
measures intended to trap, sedimient shall be constructed as a first step in
any land disturbing activity and shall be made functional before upslope land
disturbance takes place. Stabilization measures shall be applied to earthen
structures such as dams, dikes, and diversions immediately after installation.
Disposal 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 removed and replaced with suitably compacted
soils, or, where applicable, permanently stabilized to prevent further erosion and
sedimentation.
Maintenance: All erosion and sedilment control structures and systems shall be
maintained, inspected, and repaired weekly and after each significant rainfall or
as needed to insure continued performance of their intended function. Any
damage t) structural measures shall be repaired immediately.
Silt fence shall be inspected after every rainfall event and at least daily during
prolonged rainfall, as well as at the end of every working day, with any
necessary repairs made immediately. Accumulated sediment shall be removed
and disposed of as it becomes necessary, or when deposits have accumulated
to one-hoif of the above groundfence height. All undercutting or erosion shall
be . repaired immediately. the conttractor shall follow all manufacturers
recommendations for installation, maintenance, replacement, and repair.
damages caused by construction traffic or other activity must be repaired
before the end of each working day.
All seeded areas are to be checked to insure a good stand is maintained.
General construction notes for Erosion and Sediment Control plans
1. The plan approving authority must be notified one week prior to the
pre -construction conference, one week prior to the commencement of land
disturbing activity, and one week prior to the final inspection.
2. All erosion and sediment control measures will be constructed and
maintained according to minimum standards and specifications of the Virginia
Erosion and Sediment Control Handbook and Virginia Regulations VR 625=02-00
Erosion and Sediment Control Regulations.
3. All erosion and sediment control measures are to be placed prior to or as
the first step in clearing.
4. A copy of the approved erosion and sediment control plan shall be
maintained on the site at all times.
5. Prior to commencing land disturbing activities in areas other than indicated
on these plans (including, but not limited to, off -site borrow or waste areas),
the contractor shall submit a supplementary erosion control plan to the owner
for review and approval by the plan approving authority.
6. The contractor is responsible for installation of any additional erosion control
measures necessary to prevent erosion and sedimentation as determined by the
plan approving authority.
7. All disturbed areas are to drain to approved sediment control measures at
all times during land disturbing activities and during site development until final
stabilization is achieved.
8. During dewatering operations, water will be pumped into an approved filtering
device.
9. The contractor shall inspect all erosion control measures periodically and
after each runoff producing rainfall event. Any necessary repairs or cleanup to
maintain the effectiveness of the erosion control devices shall be made
immediately.
10. All fill material to be taken from an approved, designated borrow area.
11. All waste materials shall be taken to an approved waste area. Earth fill
shall be inert materials only, free of roots, stumps, wood, rubbish, and other
debris.
12. Borrow, fill or waste activity involving industrial -type power equipment shall
be limited to the hours of 7:00am to 9:OOpm.
13. Borrow, fill or waste activity shall be conducted in a safe manner than
maintains lateral support, or order to minimize any hazard to persons, physical
damage to adjacent land and improvements, and damage to any public street
because o slides, sinking, or collapse.
14. Temporary stabilization shall be temporary seeding and mulching. Seeding is
to be at 75lbs/acre, and in the months of September to February to consist a
50/50 mix of Annual Ryegrass 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 erosion control inspector.
15. 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. Permanent seeding shall
be applied at 180lbs/acre and consist of 95% Kentucky 31 or Tall Fescue and
0-5% Perennial Ryegrass or Kentucky Bluegrass. Straw mulch is to be
applied at 80lbs/100sf. Alternatives are subject to approved by the County
erosion control inspector.
16. Maintenance: All measures are to be inspected weekly and after each
rainfall. Any damage or clogging to structural measures is to be repair
immediately. Silt traps are to be cleaned when 50% of the wet storage volume
is filled with sediment. All seeded areas are to be reseedled when necessary to
achieve a good stand of grass. Silt fence and diversion dykes which are
collecting sediment to half their height must be cleaned and repaired
immediately.
17. All temporary erosion and sediment control measures are to be removed
within 15 days of final site stabilization, when measures are no longer needed,
subject to approval by the County erosion control inspector.
18. Permanent vegetation shall be installed on all denuded areas within nine (9)
months after the date the land disturbing activity commenced.
MINIMUM STANDARDS
MS-1 Permanent or temporary soil stabilization must be applied to denuded
areas within seven days after final grade is reached on any portion of the
site. Temporary soil stabilization shall be applied within seven days to
denuded areas that may not be at final grade but will remain dormant
(undisturbed) for longer than 15 days. Permanent stabilization shall be
applied to areas that are to be left dormant for more than one year. Soil
stabilization refers to measures which protect soil from the erosive forces of
raindrop impact and flowing 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-2 During construction of the project, soil stockpiles and borrow areas shall
be stabilized or protected with sediment trapping measures. The applicant is
responsible for the temporary protection and permanent stabilization of all
soil stockpiles on site as well as borrow areas and soil intentionally
transported from the project site.
MS-3 A permanent vegetative cover shall be established on denuded areas not
otherwise permanently stabilized. Permanent vegetation shall not be
considered established until a ground cover is achieved that, is uniform,
mature enough to survive and will inhibit erosion.
MS-4 Sediment basins and traps, perimeter dikes, sediment barriers and other
measures intended to trap sediment shall be constructed as a first step in
any land -disturbing activity and shall be made functional before upslope land
disturbance takes place.
MS-5 Stabilization measures shall be applied to earthen structures such as
dams, dikes, traps, basins and diversions immediately after installation.
MS-6 Surface runoff from disturbed areas that is comprised of flow from
drainage areas greater than or equal to three acres shall be controlled by a
sediment basin. The sediment basin shall be designed and constructed to
accommodate the anticipated sediment loading from the land disturbing
activity. The outfall device or system design shall take into account the
total drainage area flowing through the disturbed area to be served by the
basin.
MS-7 Cut and fill slopes shall be constructed in a manner that will minimize
erosion. Slopes that are found to be eroding 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 an adequate temporary or permanent channel, flume, or
slope drain structure.
MS-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 conveyance
system without first being filtered or otherwise treated to remove sediment.
MS-11 Before newly constructed stormwater conveyance channels are made
operational, adequate outlet protection and any required temporary or
permanent channel lining shall be installed in both the conveyance channel
and receiving channel.
MS-12 through 15 - Not applicable, no live watercourses.
MS-16 Underground utility lines shall be installed in accordance with the
following standards in addition to other applicable criteria:
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.
c. Effluent from dewatering operations shall be filtered or passed through an
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.
e. Applicable safety regulations shall be complied with.
MS-17 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 every four hours.
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.
MS-18 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.
MS-19 Drainage Area A discharges into the pond. The increase in impervious area
is less than 1 % of the total pond watershed area. (9VAC25-870-66 C-3-a).
Drainage Area B is reduced in size. Concentrated flows at the driveway ditch
and roof drains are routed to level spreaders to create sheetflow condition.
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SCALE: 1 "-2,000 FT.
GENERAL EROSION AND SEDIMENT CONTROL NOTES
ES-1: UNLESS OTHERWISE INDICATED, ALL VEGETATIVE AND STRUCTURAL
EROSION AND SEDIMENT CONTROL PRACTICES WILL BE CONSTRUCTED AND
MAINTAINED ACCORDING TO MINIMUM STANDARDS AND SPECIFICATIONS OF APPROVED
THE VIRGINIA EROSION AND SEDIMENT CONTROL HANDBOOK AND VIRGINIA b thr) ,^'I)ernarle, Counbh
REGULATIONS VR 625-02-00 EROSION AND SEDIMENT CONTROL Y ''
Corr�r
REGULATIONS. ~,' ,; ; ' t
C �, l --.._= ES-2: THE PLAN APPROVING AUTHORITY MUST BE NOTIFIED ONE WEEK Flle ��� ' �' � I 116 _ 0
PRIOR TO THE PRE- CONSTRUCTION CONFERENCE, ONE WEEK PRIOR TO
THE COMMENCEMENT OF LAND DISTURBING ACTIVITY, AND ONE WEEK
PRIOR TO THE FINAL INSPECTION.
ES-3: ALL EROSION AND SEDIMENT CONTROL MEASURES ARE TO BE
SITE
DATA:
PLACED PRIOR TO OR AS THE FIRST STEP IN CLEARING.
ES-4: A COPY OF THE APPROVED EROSION AND SEDIMENT %'X:NTROL
OWNER/DEVELOPER:
PLAN SHALL BE MAINTAINED ON THE SITE AT ALL TIMES. .
WOODLANDS FARM, LLC
ES-5: PRIOR TO COMMENCING LAND DISTURBING ACTIVITIES IN AREAS
1110 WOODLANDS RD.
TM 44 PARCEL 1
OTHER THAN INDICATED ON THESE PLANS ( INCLUDING, BUT NOT LIMITED
ALBEMARLE COUNTY, VA
TO, OFF -SITE BORROW OR WASTE AREAS), THE CONTRACTOR SHALL
SUBMIT A SUPPLEMENTARY EROSION CONTROL PLAN TO THE OWNER FOR
LOCATION:
REVIEW AND APPROVAL BY THE PLAN APPROVING AUTHORITY.
1110 WOODLANDS RD.
TM 44 PARCEL 1
ES-6: THE CONTRACTOR IS RESPONSIBLE FOR INSTALLATION OF ANY
ALBEMARLE COUNTY, VA
ADDITIONAL EROSION CONTROL MEASURES NECESSARY TO PREVENT
EROSION AND SEDIMENTATION AS DETERMINED BY THE PLAN APPROVING
MAGISTERIAL DISTRICT: JACK JOUETT
AUTHORITY.
PLAN PREPARED BY:
B. CLARK GATHRIGHT, P.E.
ES-7: ALL DISTURBED AREAS ARE TO DRAIN TO APPROVED SEDIMENT
100 1OTH ST NE SUITE 200
CONTROL MEASURES AT ALL TIMES DURING LAND DISTURBING ACTIVITIES
CHARLOTTESVILLE, VA 22902
AND DURING SITE DEVELOPMENT UNTIL FINAL STABILIZATION IS ACHIEVED.
ES-8: DURING DEWATERING OPERATIONS, WATER WILL BE PUMPED INTO
T.M. 11 PARCEL 1
AN APPROVED FILTERING DEVICE.
TOTAL SITE AREA: 39.2
ZONING: RA
ES-9: THE CONTRACTOR SHALL INSPECT ALL EROSION CONTROL
DATUM REFERENCE FOR ELEVATION: NAVD88
MEASURES PERIODICALLY AND AFTER EACH RUNOFF PRODUCING RAINFALL
EVENT. ANY NECESSARY REPAIRS OR CLEANUP TO MAINTAIN THE
SOURCE OF TOPOGRAPHY:
ROGER W. RAY & ASSOC.,INC. - MAY 3, 2018
EFFECTIVENESS OF THE EROSION CONTROL DEVICES SHALL BE MADE
IMMEDIATELY.
NEW RESIDENCE AND DRIVEWAY TO REPLACE
EXISTING RESIDENCE AND DRIVEWAY
THE RLD IS RESPONSIBLE FOR ONGOING MAINTENANCE AND OPERATION
OF THE E&SC PLAN.
SETBACKS: FRONT: 75 FT.
SIDE: 25 FT.
FOR THE PURPOSES OF PLAN SUBMITTAL, REVIEW AND APPROVAL, THE
REAR: 35 FT.
RLD IS B. CLARK GATHRIGHT, P.E.
SEQUENCE OF CONSTRUCTION
1. Install Construction Entrance and Phase 1 silt fence and check dam
where shown on the plan.
2. Excavate and grade areas per the phasing sequences shown, while
placing and compacting fill in the proposed house site area. Utilize
excavated topsoil to cover the previously excavated phasing area
and provide permanent seeding measures to stabilize newly graded
surfaces as the excavation phasing progresses up the hill.
3. If the site will remain dormant for more than 15 days, provide
temporary seeding measures to stabilize the surface.
4. When building construction is complete, completely distribute the
temporary topsoil stockpile as necessary to complete final grading.
5. Apply mulching and permanent seeding on all permanently stabilized
areas.
6. Remove silt fence and check dams after all disturbed areas are
stabilized, with County Inspector approval.
DRAWING INDEX
DISTURBED AREA: 3.9 ACRES
EXISTING IMPERVIOUS SURFACE: 0.50 ACRE
NEW IMPERVIOUS SURFACE: 0.58 ACRES
IMPERVIOUS SURFACE INCREASE: 0.08 ACRES
WATER QUANTITY: LESS THAN 1 % OF THE TOTAL
WATERSHED (9VAC25-870-66 C-3-A)
INCREASE IN SHEETFLOW VOLUME WILL NOT CAUSE
OR CONTRIBUTE TO EROSION, SEDIMENTATION, OR
FLOODING OF DOWN GRADIENT (9VAC25-870-66 D)
WATER QUALITY: 0.66 LB.YR NUTRIENT CREDIT
PURCHASE
CRITICAL SLOPES: NO CRITICAL SLOPES IN THE
PROJECT AREA.
TIMING OF CONSTRUCTION: SPRING 2019
VIRGINIA OUTDOORS FOUNDATION EASEMENT:
D.B. 1775 P.56
1 C-1.0
TITLE SHEET & EROSION
AND SEDIMENT CONTROL NARRATIVE
2 C-1.1
EXISTING CONDITIONS &
DEMOLITION PLAN
3 C-1.2
EROSION AND SEDIMENT
CONTROL PLAN
4 C-1.3
EROSION AND SEDIMENT
CONTROL DETAILS
5 C-1.4
STORMWATER MANAGEMENT PLAN
6 C-1.5
CALCULATIONS
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J f — DRAINAGE AREA: 4,110 S.F. Qio INFLOW: 0.6 CFS
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PROPOSED LIMIT OF GRADING
TOTAL DISTURBED AREA: 3.96 AC.
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EROSION & SEDIMENT CONTROL PLAN
SCALE: 1 " = 40'-0"
LINEYPE & SYMBOL LEGEND
EXISTING CONTOUR LINE —
CONSTRUCTION ENTRANCE 3.02
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PROPOSED CONTOUR LINE
PROPERTY BOUNDARY — — — —
SILT FENCE 3.05—x—x—
STREAMBUFFER - — — — — — — — — — — — —
— —
SOIL OIL TYPE BOUNDARY
ROCK CHECK DAM 3.20
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LIMIT OF GRADING —
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SOIL TYPE XXX
LEVEL SPREADER 3.21
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TEMPORARY SEEDING 3.31
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SWPPP NOTE:
THE USE OF CHEMICALS/SOLVENTS IS
PERMANENT SEEDING 3.32
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NOT ANTICIPATED. PAINTS, STAINS AND
POLYURETHANE FINISH MATERIALS WILL
BE STORED INSIDE THE BUILDING.
MULCHING 3.35
DUST CONTROL 3.39
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STONE CONSTRUCTION ENTRANCE
GROUND
70' MIN.
FILTER CLOTH -` 6" MIN. I A I
SIDE ELEVATION
12' MIN.
70' MIN.
B WASHRACK
I r- (❑PTI❑NAL)
10,
L VD❑T #1 I I �� P❑SITIVE DRAINAGE
COURSE AGGREGATE B TO SEDIMENT
I TRAPPING DEVICE
* MUST EXTEND FULL WIDTH
OF INGRESS AND EGRESS
OPERATION PLAN VIEW
P171
SECTION A —A
EXISTING
PAVEMENT
5:1
��MOUNT�ABLE BERM
(❑PTI❑NAL)
_T_
10' MIN,
EXISTING
PAVEMENT
10' MIN.
DKHIN SrMUL
SECTION B-B
SOURCE: ADAPTED from 1983 Maryland Standards for Soil erosion and Sediment Control, and Va. DSWC Plate 3.02-1
CONSTRUCTION ENTRANCE DETAILS
SCALE: NONE
CONSTRUCTION OF A SILT FENCE
(WITH WIRE SUPPORT)
1. SET POSTS AND EXCAVATE A 4"X4" 2. STAPLE WIRE FENCING TO THE POSTS.
TRENCH UPSLOPE ALONG THE LINE
OF POSTS.
FLOW I
3. ATTACH THE FILTER FABRIC TO THE WIRE
FENCE AND EXTEND IT INTO THE TRENCH.
4. BACKFILL AND COMPACT THE
EXCAVATED SOIL.
G
FLOW
EXTENSION OF FABRIC AND WIRE INTO THE TRENCH.
SOURCE: Adapted from Installation of Straw and Fabric Filter Barriers for Sediment Control, PLATE. 3,05-1
shaww & Thant
SILT FENCE DETAILS
SCALE: NONE
S rON E
CONSTRUCTION
ACCESS --\
a •
ii � *fir r i. • •.
�r��°�iciar /�`'�f i'r®� i ., e►.� p:Fro A..:
4'!4/��''f1`��`.`'`'�aiw�yiawe�fivr�f�yell��,rt�'t�`�i'`1rti►Ipfl�a�:i'ai+r'�r��aw.Or�v
.r .�. ` ,
4 ' M 4''6
fir::
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r �
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..lii.+�cAY.rs►�FI�►aYY�YY.�\�YYYJ�Y•fttiij�,�
+ r r
�I
�I
ALT: PAVED WASH RACK, IF REQUIRED BY COUNTY E&SC INSPECTOR
SILT .FENCE DROP INLET
PROTECTION
2 X 4' WOOD FRAME
STAKE
DROP INLET
i tTTI, rnwrr
kME
GATHER
EXCESS
AT CORNERS
PERSPECTIVE VIEWS
ELEVATION OF STAKE AND
FABRIC ORIENTATION
SPECIFIC APPLICATION
/ IAI
1' IQIL
�qll
DETAIL A
THIS METHOD OF INLET PROTECTION IS APPLICABLE WHERE THE
INLET DRAINS A RELATIVELY FLAT AREA (SLOPE NO GREATER
THAN 5%) WHERE THE INLET SHEET OR OVERLAND FLOWS (NOT
EXCEEDING 1 C.F.S.) ARE TYPICAL. THE METHOD SHALL NOT
APPLY TO INLETS RECEIVING CONCENTRATED FLOWS, SUCH AS
IN STREET OR HIGHWAY MEDIANS.
SOURCE: N.C. Erosion and Sediment Control Planning and Design Manual, 1988 PLATE 3.07-1
ROCK CHECK DAM
2 ACRES OR LESS OF DRAINAGE AREA:
FIL
(01
VDOT #1
COARSE AGGREGATE
FLOW
SOURCE: VA. DSWC
ROCK CHECK DAM
-1.3J SCALE: NONE
199 3,3
TABLE 3.32-C
SITE SPECIFIC SEEDING MIXTURES
FOR APPALACHIAN/MOUNTAIN ARE
Total Lbs.
Minimum Care Lawn
P r Acre
- Commercial or Residential
2010-250 lbs.
- Kentucky 31 or Turf -Type 'Tall Fescue
90-1 %
- Improved Perennial R.yegrass *
0-10%
- Kentueky Bluegrass
0-10%
high -Maintenance Lawn
Minimum of three (3) up to five (5) varieties
of btuegrass from approved list for use in Virginia.
12,E lbs.
.General Slope Q.- l or less}
- Kentucky 31 Fescue
128 lbs.
Red To Grass
2 tbs.
Seasonal Nurse Crop
1SO lbs.
Low -Maintenance Slope (Steeper than 3:1
- Kentucky 31 Fescue
108-tbs.
- Red Top Grasp
2 lbs.
- Seasonal Nurse Crop s >z -
20 lbs.
Crownvetch * * *
20 lbs.
150 lbs.
'Perennial Ryegrass will germinate faster and at lower soil temperatures
than
fescue, thereby prQvdig cover and erosion resistance for seedbed.
use, seasonal nurse crop in accordance with seeding dates as stated below:
March, April through May 1th .. ...
Annual Rye
May 16th through August 15th , .. .. e ... , ....
Foxtatl Millet
August lfath through September, October .... . . . . . ...
. Annual Rye
November through February . . ..... .... ......
Winter Rye
* * * If Flatpea is used, increase to 30 lbs./acre, All legume seed ;must
be properly
inoculated, Weeping Lovegrass may also be included in arty
slope car low-
maintenance mixture during warmer seeding period add. 10-20 lbs/acre in mixes.
III - 302
4 TABLE 3.32-C
C-1.3
PLATE. 3.20-1
LEVEL SPREADER
CROSS SECTION
JUTE, OR EXCELSIOR LENGTH: 10'
OR EQUIVALENT STAPLED IN PLACE do VARIABLE (MIN. 7')
BURIED 6" MIN. fi" MIN.
.�- BURIED 6" MIN.
LEVEL LIP OF
SPREADER —
LEVEL SPREADER WITH VEGETATED LIP
�s"�LEVEL SPREADER DETAIL
C-1.3
2:1 OR
FLATTER
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REVISIONS:
01-21-19
DATE:
10-31-18
DRAINING NUMBER:
C-1
e3
SHEET
4
OF 6
SWM NOTES
1. CONCENTRATED FLOWS AT THE DRIVEWAY DITCH
AND ROOF DRAINS ARE ROUTED TO LEVEL
SPREADERS TO CREATE SHEETFLOW CONDITION.
2. DA A - 36 AC. NET INCREASE OF 0.13 AC.
NET INCREASE OF IMP. AREA: 0.01 AC.
3.14 AC. DISTURBED AREA
3. DAB - 6.1 AC. NET DECREASE OF 0.13 AC.
NET INCREASE OF IMP. AREA: 0.07 AC.
0.88 AC. DISTURBED AREA
1
STORMWATER MANAGEMENT PLAN
SCALE: I ,oaw"
� r
DAB - 6.1AC.
NET DECREASE OF 0.13 AC.
NET INCREASE OF IMP. AREA: 0.07 AC. I
0.88 AC. DISTURBED AREA 1
DA A - 36 AC.
NET INCREASE OF 0.13 AC,
NET INCREASE OF IMP. AREA: 0.01 AC.
3.14 AC. DISTURBED AREA
SOURCE: COUNTY GIS
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REVISIONS:
01-21-19
DATE:
10-31-18
DRAWING NUMBER:
C-i
• 4
SHEET
5
OF 6
Project Name:
Date:
Linear Development Project?
Site information
Post -Development Project (Treatment Volume and Loads)
Enter Total Disturbed Area (acres)
Constants
Annual Rainfall (inches)
Target Rainfall Event (inches)
Tota l Phosphorus (TP) EMC (rn
Total Nitrogen (TN) EMC (mg/l
TargetTP Load (lb/acre/yr)
Pj (unitless correction factor)
110,1110 LPLOITI a : Z1I] Iivl lrM,Zyi
Land Cover
Pre-ReDevelopment
Forest/Open Space Cover (acres)
Weighted Rv(forest)
% Forest
Managed Turf Cover (acres)
Weighted Rv(turf)
% Managed Turf
Impervious Cover (acres)
Rv(impervious)
% Impervious
Total Site Area (acres)
Site Rv
Pyre-ReDevelopment Treatment Volume
(acre-ft)
I Pre-ReQevelopment Treatment Volume
(cubic feet)
43
1100
0.25 .
s.s6
Q.41
0. o
Pre
Listed
Baseline TP Load (lb/yr)
(0.41 Ibs/acre/yr applied to pre -redevelopment area excluding pervious
land proposed for new Impervious cover)
B Soils
R Soils
Adjusted'
I Adjusted Lurid Cover Surrimary:
,ire aeDevelopment hand cover minus pervious land cover (forest/open space or
managed turf) acreage proposed for new impervious cover.
Adjusted tot -cal acreage is con5:istent with post-ReVevelopment acreage (minus
acreage of new impervious cover).
Column I.5how-5 load reduction requriernent for new impervious cover (based on new
development load thnit, 0.41 lb.51cacrelyecar),
Pre-ReDevelopment TN Load (iblyr)
C Soils I G Soils I Totals
C Soils I a Soils I Totals
constant .values
Check: I
BMP Design Specifications List: 2013
Linear Project'? No
[laud cover areas entered correctly?
Total disturbed area entered? v1
Runoff Coefficients
Rv
A Soils
B Soils
C Sails
Q Sails
Forest/Open Space
t�. 0
U3
0.04
005
Managed Turf
0.15
OZ
fi.Z2
0.25
Impervious Cover
0,95
Q.05 _
0.95
o s
TP Load Reduction Required (lb/yr)
* - LOAD REDUCTION MET BY 0.66 LB/YR NUTRIENT CREDIT PURCHASE
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REVISIONS:
01-21-19
DATE:
10-31-18
DRAWING NUMBER:
C-1
5
r
SHEET
6
OF 6