HomeMy WebLinkAboutWPO202000006 Plan - VSMP 2020-10-29Erosion and Sediment Control Narrative For:
2946 Monacan Trail Rd.
TM 87 Parcel 26
Albemarle County, VA
HUC: NORTH FORK HARDWARE RIVER 020802031201
LAT: 37.968000N LONG: 78.63180OW
Project Description: The proposed work involves the construction of a new
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parking area and travelway at an existing store. The project area is on the
west side of Monacan Trail Rd, just north of Taylor's Gap Rd. The total area
of the parcel is 1.989 acres. The total on -site disturbed area is approximately
0.47 acre. Work will be completed Spring of 2020.
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 yard and field and
generally slopes to the southeast at 5 to 8%. The overall pre and post
drainage patterns will be the same.
Adjacent Property: The property is surrounded by small residential lots and
large acreage farms and wooded areas.
Off -site Areas: No off -site areas will be involved in this project.
Soils: 19C-Minnieville loam, 0.24 K-Factor, Group B soil
416-Yadkin loam, 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
of the parking area, then distributed over the drainfield area with final grading.
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 Frntraace: (CE) 3.02 (To be installed where construction site traffic exits the project
area, to remove soil from tires prior to travel on public roads. The contractor shall clean and
maintain 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 footprint 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 runofffrom crossing disturbed
areas. )
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 end
of the roof drains to disperse concentrated runoff.)
Peramient Seeding (PS) 3.32 Establishment of perennial vegetative cover by planting seed where
pernmient, 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 C3.3 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 problemvs 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 % to t/z 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.
Polly's Folly
W PO2020-00006
Management Strategies: Construction should be sequenced so that grading
operations can begin and end as quickly as possible. Areas that are not to
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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 sediment shall be constructed as a first step in
an land disturbing activity and shall be made functional before u slo a land
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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 sediment 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 to 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-half of the above ground fence height. All undercutting or erosion shall
be repaired immediately. the contractor 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 accordingto minimum standards and specifications of the Virginia
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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 9:00pm.
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. An damage or clogging to structural measures is to be repair
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immediately. Silt traps are to be cleaned when 50% of the wet storage volume
is filled with sediment. All seeded areas are to be reseeded 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 daysof final site stabilization when measures are no longer needed 9 ,
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 Duringconstruction of the project, soil stockpiles and borrow areas shall
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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
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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 Channel Protection - The site's peak flow rate from a one-year 24-hour
storm is less than 1% of the existing peak flow rate from a one-year 24-hour
storm prior to implementation of any stormwater water quantity control measures.
(9VAC25-870-66 B-4-b).
VICINITY MAP
SCALE: 1 "=500'
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
THE VIRGINIA EROSION AND 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 DISTURBING ACTIVITY, AND ONE WEEK
PRIOR TO THE FINAL INSPECTION.
ES-3: ALL EROSION AND SEDIMENT CONTROL MEASURES ARE TO BE
PLACED PRIOR TO OR AS THE FIRST STEP IN CLEARING.
ES-4: A COPY OF THE APPROVED EROSION AND SEDIMENT CONTROL
PLAN SHALL BE MAINTAINED ON THE SITE AT ALL TIMES.
ES-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.
ES-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.
ES-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.
ES-8: DURING DEWATERING OPERATIONS, WATER WILL BE PUMPED INTO
AN APPROVED FILTERING DEVICE.
ES-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.
THE RLD IS RESPONSIBLE FOR ONGOING MAINTENANCE AND OPERATION
OF THE E&SC PLAN.
FOR THE PURPOSES OF PLAN SUBMITTAL, REVIEW AND APPROVAL, THE
RLD IS B. CLARK GATHRIGHT, P.E.
SEQUENCE OF CONSTRUCTION
1. Install Construction Entrance and silt fence where shown on the
plan.
2. Excavate foundations and grade travelways as required.
3. If the site will remain dormant for more than 15 days, provide
temporary seeding measures to stabilize the surface.
4. Install storm pipe and structures and provide inlet protection.
5. When building construction is complete, completely distribute the
temporary stockpile as necessary to complete final grading.
6. Apply mulching and permanent seeding on all permanently stabilized
areas.
7. Remove silt fence after all disturbed areas are stabilized.
APPROVED
by the Albemarle County
Communittyy Development Department
Date 4/8I20
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DRAWING INDEX
SITE DATA:
OWNER/DEVELOPER:
THREEDEE LLC
1429 BURCHS CREEK RD
CHARLOTTESVILLE, VA 22903
LOCATION:
2946 MONACAN TRAIL RD.
TM 87 PARCEL 26
ALBEMARLE COUNTY, VA
PLAN PREPARED BY:
B. CLARK GATHRIGHT, P.E.
100 10TH ST NE SUITE 200
CHARLOTTESVILLE, VA 22902
TOTAL SITE AREA: 1.989 Ac.
ZONING: RA
SOURCE OF TOPOGRAPHY:
COUNTY GIS
NEW BUILDING ADDITION & PARKING AREA
DISTURBED AREA: 0.46 ACRE
EXISTING IMPERVIOUS SURFACE: 0.1 ACRE
NEW IMPERVIOUS SURFACE: 0.25 ACRE
WATER QUANTITY:
SITE CONTRIB. DRAINAGE AREA: 0.46 AC., IS
LESS THAN 1% OF 159 AC. STREAM WATERSHED.
LAND AREA IS LESS THAN 1% OF THE TOTAL
WATERSHED (9VAC25-870-66 B-4-A)
CHANNEL ADEQUACY: RUNOFF IN THE VDOT
MEDIAN CHANNEL IS CALCULATED AT THREE
POINTS AND IS ADEQUATELY CONTAINED WITH
ALLOWABLE VELOCITIES AT EACH LOCATION.
WATER QUALITY: 0.28 LB./YR NUTRIENT CREDIT
PURCHASE REQUIRED
CRITICAL SLOPES: NO CRITICAL SLOPES IN THE
PROJECT AREA.
TIMING OF CONSTRUCTION: SPRING 2020
1 T-1.0
TITLE SHEET & EROSION AND SEDIMENT CONTROL NARRATIVE
2 C-1.0
EXISTING CONDITIONS & EROSION AND SEDIMENT CONTROL PLAN
3 C-1.1
STORMWATER MANAGEMENT PLAN
4 C-1.2
EROSION AND SEDIMENT CONTROL DETAILS
5 C-1.3
CALCULATIONS
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REVISIONS:
03-19-2020
DATE:
02-10-2020
DRAWING NUMBER:
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SHEET 1 OF 6
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/ 20,187 SF, 0.46 AC_ _ _ — — _
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EXISTING
2-STORY
' BUILDING /
RET, WALL
EXISTING PAVEMENT
RT. 29' S.B.
< EXISTING 15" CULVERT /
EXISTING CONDITIONS/DEMOLITION PLAN TOPO SOURCE: COUNTY GIS
C 1.o� SCALE: I"=30'
LINETYPE & SYMBOL LEGEND
EXISTING CONTOUR LINE
PROPOSED CONTOUR LINE
PROPERTY BOUNDARY — — — — — — — — — —
DRAINAGE DIVIDE
LIMIT OF GRADING 1� 1� 1� 1� 1♦
SOIL TYPE BOUNDARY =
SOIL TYPE XXX
SWPPP NOTE:
THE USE OF CHEMICALS/SOLVENTS IS
NOT ANTICIPATED. PAINTS, STAINS AND
POLYURETHANE FINISH MATERIALS WILL
BE STORED INSIDE THE BUILDING.
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CONSTRUCTION ENTRANCE 3.02 Q
SILT FENCE 3.05 S F X X
STORM DRAIN INLET PROTECTION 3.07 I P
TEMPORARY SEEDING 3.31 TS
PERMANENT SEEDING3.32 PS
MULCHING 3.35
SOIL BLANKETS & MATTING 3.36
TEMPORARY SOIL STOCKP4
1
2 EROSION & SEDIMENT CONTROL PLAN
C-1 .0SCALE: 1 "=30'
RT. 29 S.B.L.
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REVISIONS:
03-19-2020
DATE:
02-10-2020
DRAWING NUMBER:
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SHEET 2 OF 6
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CONCRETE DITCH - _ - _ ` %
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STA 2
� _! \ � � �\� _ - \ �-�_\ � POINT OF ANALYSIS
_ _ DA: 9.37 AC.
I(�� - - - - EXISTING 15" CULVERT STA 3 _ - _ \ \ 7 , 0.79 AC. IMP.
POINT OF ANALYSIS 1 \ \ \ /<� _-_--------- ---- - ���� _ \ /
EXISTING 15" CULVERT I \---------- ---- ---- �� \ ---
�y�= DA: 4.61 AC.' l I \ / --^ - CONCRETE DITCH _ - - - - - _ _ - _ - - _
PRE IMP AREA: 0.79 AC. \ \ i \ / / i i / r---�__- - - _- - - T �� - - - _ _ � _
POST IMP. AREA: 0.94 AC. \ \ I I / - / - - - - - _ _ _
- / / // ^ / — \ "'� - G / a BOX CONCRETE
---_ BOX CULVERT
OVERALL DRAINAGE AREA TOPO SOURCE: COUNTY GIS
C-17 77771717
Slormwater Summary
The proposed improvements will disturb 0.47 acre of the total 1.989 acre parcel. Runoff from the project area
discharges and sheetflows into a culvert on Rt. 29 southbound ditch, which conveys runoff into a concrete v-ditch in
the median. Ultimately, the median ditch discharges into a stream. At this point, the project site area is less than 1 %
of the stream watershed.
Channel adequacy of the VDOT median is checked at three locations. At each point, the channel is adequate for the
increase in runoff from 2-year and 10-year storms generated by the new development.
STA 1
Concrete 1:1 v-ditch
2-year peak flow: 8.27 cfs, Max. Velocity: 12.94 fps
10-year peak flow: 20.49 cfs, Max. Velocity: 15.23 fps
STA 2
Grass 3:1 / 16:1 v-ditch
2-year peak flow: 8.77 cfs, Max. Velocity: 3.02 fps
10-year peak flow: 21.36 cfs, Max. Velocity: 3.77 fps
STA 3
Concrete 1:1 v-ditch w/ riprap above
2-year peak flow: 6.21 cfs, Max. Velocity: 12.43 fps
10-year peak flow: 24.45 cfs, Max. Velocity: 177.52 fps
0.46 AC.
STREAM DRAINAGE AREA
SCALE: 1 "=509
STREAM WATERSHED: 159 AC.
SITE CONTRIB. DRAINAGE AREA: 0.46 AC.
LESS THAN 1% OF AREA.
LAND AREA IS LESS THAN 1% OF THE
TOTAL WATERSHED
(9VAC25-870-66 B-4-A)
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03-19-2020
DATE:
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DRAWING NUMBER:
C-1
1
9
SHEET 3 OF 6
STONE CONSTRUCTION ENTRANCE
GROUND
70' MIN, EXISTING
AI 3, PAVEMENT
5:1 Y
FILTER CLDTH� 6" MIN. AI MOUNTABLE BERM
(OPTIONAL)
SIDE ELEVATION
12' MIN.
V➢OT #1
COURSE AGGREGATE
' MUST EXTEND FULL WIDTH
OF INGRESS AND EGRESS
OPERATION
RE6I u.iI uKNIN
B
70' MIN.
WASHRACK
(OPTIONAL)
i \ POSITIVE DRAINAGE
B TO SEDIMENT
TRAPPING DEVICE
PLAN VIEW
SECTION A -A
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)
POSTS1. SET . THE POSTS.
TRENCH UPOF POSTS.
SLOPE ALONG THE LINE •..I� 1� I
Jill
IIIIl�I�► °�,,,,I _iill�
I II��
3. ATTACH THE FILTER FABRIC TO THE WIRE 4. BACKFILL AND COMPACT
FENCE AND EXTEND IT INTO THE TRENCH. EXCAVATED SOIL.
rfl IF'.
Jill
rll I/'
I .
_lillr=
ll—FLOWFILTER FABRIC
EXTENSION OF FABRIC AND WIRE INTO THE TRENCH.
WIRE
�I
SOURCE: Adapted from Installation of Straw and Fabric Filter Barriers for Sediment Control,
Sherwood & Xyant
4 SILT FENCE DETAIL
\C-1.2 SCALE: NONE
STONE 70' MIN.
CONSTRUCTION
ACCESS il�3" SM-2A ASPHALT TOP
COURSE EXISTING
2% 2% PAVEMENT
. \�b"VA. �21 A' AGGR_Oa7L BASE
PROFIL
STONE 70' MIN.
CONSTRUCTION ASPHALT PAVED
ACCESS - A WASHRACK
EXISTING
2% 2% PAVEMENT
I2% 12' MIN."
"MUST EXTEND FULL WIDTH L� POSITIVE DRAINAGE
OF INGRESS AND EGRESS TO SEDIMENT
OPERATION TRAPPING DEVICE
PLAN
12' MIN. POSITIVE DRAINAGE
2% TO SEDIMENT
TRAPPING DEVICE
FILTER CLOTH
SECTION A -A
A nnin mun water tap of 1 inch must be installed with a Inininitun 1 inch ballcock
shutoff valve supplying a wash hose with a diameter of 1.5 inches for adequate
constant pressure. Wash water must be carried away from the entrance to an
approved settling area to remove sediment. All sediment shall be prevented from
entering stomn drains, ditches or watercourses.
PAVED WASH RACK
NO SCALE
ALT: PAVED WASH RACK, IF REQUIRED BY COUNTY E&SC INSPECTOR
TYPICAL TREATMENT -
(SOIL STABILIZATION BLANKET)
INSTALLATION CRITERIA
2"
TAMP FIRMLY
ANCHOR SLOT
2"
T-
ANCHOR SLOT
NOTES
APPROXIMATELY 200 STAPLES REQUIRED
PER 100 SQ. YDS. OF MATERIAL ROLL.
y ANCHOR SLOTS, JUNCTION SLOTS &
CHECK SLOTS TO BE BURIED 6" TO 12".
12" MAX. 4:1 OR FLATTER
6" MAX. STEEPER THAN 4:1 _
JUNCTION SLOT
EDGE AND END JOINTS
CHECK SLOT { TO BE SNUGLY ABUTTED
(JUTE MESH WILL HAVE
TERMINAL FOLD STAPLED LAP JOINT IN
LIEU OF EDGE JOINT)
LAP JOINT 2" MIN. I
(JUTE MESH ONLY) I
5' MAX. 4:1 OR FLATTER
3' MAX. STEEPER THAN 4:1
T
1 I I
6" TO 12" I I I I I I
I I I I I I
I I I I I
CHECK SLOT
Fr JE2'�
JUNCTION SLOT
TAMP
FIRMLY
�12"
"CHECK SLOT
I I
� 1' , 0 2"
I I I I I I I I I I
VAR. VAR.
TO a' MI PLAN VIEW
STAPLING DIAGRAM
CHECK SLOTS AT MIN.
STAPLE FORMED FROM NO.11 STEEL WIRE. 50' C—C INTERVALS;
8" STAPLE MIN. LENGTH FOR SANDY SOIL. NOT REQ.'D WITH ALL
6" STAPLE MIN. LENGTH FOR OTHER SOIL. "�nI,ADiI,i An.,wDi Akio c
❑ 12,
PLATE.3.05-1 SOURCE: VDOT ROAD AND BRIDGE STANDARDS
_ 4 BIM DETAILS
C-1.2 SCALE: NONE
TERMINAL FOLD
Y
2"
PLATE: 3.36-2
SILT FENCE DROP INLET
PROTECTION
2 X 4' WOOD FRAME
DROP INLET
NLNNIsoMIAMI=!hI
IM;
\
7
AT CORNERS
PERSPECTIVE VIEWS
ELEVATION OF STAKE AND
FABRIC ORIENTATION
SPECIFIC APPLICATION
�.1' MIN.
IIIII
V
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
2111111111111111INLET PROTECTION DETAIL
-1.2j SCALE: NONE
PLATE 3.07-1
TYPICAL ORIENTATION OF
TREA TMENT - i
(SOIL STABILIZATION BLANKET)
sHAI I OW
WHERE THERE IS A BERM AT THE TOP OF THE SLOPE,
BRING THE MATERIAL OVER THE BERM AND ANCHOR R
BEHIND THE BERM.
ON SHAi I nw SLOPES, STRIPS OF
NETTING PROTECTIVE COVERINGS
MAY BE APPLIED ACROSS
THE SLOPE.
in=n=u
III=R=1f 11=,.
IL=71=7f.=71=71=.1,
_ It=11=11=11=11=11=1n
=.I I:=11:-11-11:=.11=11=11=11=11-
-=.11=1I=11=11=II=11=
- 1=11=11=11=
ON CTCFP SLOPES, APPLY
PROTECTIVE COVERING PARALLEL
TO THE DIRECTION OF FLOW
AND ANCHOR SECURELY.
4
BRING MATERIAL DOWN TO A LEVEL AREA BEFORE
TERMINATING THE INSTALLATION. TURN THE END
UNDER 4" AND STAPLE AT 12" INTERVALS.
IN DITCHES, APPLY PROTECTIVE COVERING
PARALLEL TO THE DIRECTION OF FLOW.
USE CHECK SLOTS AS REQUIRED. AVOID
JOINING MATERIAL IN THE CENTER OF
THE DITCH IF AT ALL POSSIBLE.
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03-19-2020
DATE:
02-10-2020
DRAWING NUMBER:
C-192
SHEET 4 OF 6
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03-19-2020
DATE:
02-10-2020
DRAWING NUMBER:
C-1
03
SHEET 5 OF 6
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03-19-2020
DATE:
02-10-2020
DRAWING NUMBER:
C-i 04
SHEET 6 OF 6