HomeMy WebLinkAboutWPO200500034 Plan - Stormwater Stormwater Management Plan 2005-06-02ENERGY DISSIPATOR
(see detail)
210 -FILTER
4 OR 6' PERFORATED PVC
PIPEo POSITVE SLOPE
WITH CLEANOUTS EVERY 50'
4„1 '
ST2
AFTER CONVERSION
TO &OFILTER
12>I0 -FILTER
4 OR G'NON- PERFORATED PVC
PIPEo POSITVE SLOPE
Bio -Filter Sizing
3325 sf Impervious 057.=167 sf req
168 sf provided 0 bottom of weir
Blo-Filter Planting
168sf o 400/ac = 2 plants
2 18' mix Rcd O r ogwood/Spice Bush
ENERGY DISSIPATOR
(see detail)
BIO -FILTER
4 OR 6' PERFORATED PVC
PIPEo POSITVE SLOPE
WITH CLEANOUTS EVERY 50'
/ \ \ LOT \8
) 1 �
I \ I
1
ST3
AFTER CONVERSION
TO P>IOFILTER
&O -FILTER
4 OR 6'NON- PERFORATED PVC
PIPEo POSITVE SLOPE
Bio -Fater Sizing
13,420 sf impervious o 5Z= 671 sf roq
676 sf provided 0 bottom of weir
Bio -Filter Pl onting
450sf 0 400/ac - 7 plants
1 1.5'cal mix Red Maple/Pin Oak
6 16. mix Pod Osier Dogwood/Spice Bush
Zl, x Z_A�n i
BMP
PLANTING SCHEDULE
O
NUM
SIZE
SPECIES
TEMP. STONE CONST. ENTRANCE
Silt Trap #2
Drainage Area (ac)
:
1.03
O4
2
1.5" Cal
RED MAPLE/PIN OA
DD
Wet Storage Req
(cy):
69.01
TEMPORARY SEDIMENT TRAP
3.13
TSD
TEMPORARY SLOPE DRAIN
3.15
Dry Storage Req
(cy):
69.01
CD
ROCK CHECK DAMS
3.20
LS
4 OR
PIPED POSITVE SLOPE
Total Storage Req
(cy):
138.02
3.30
TS
TEMPORARY SEEDING
3.31
PS
PERMANENT SEEDING
Elev Side
1
Side
2 AVol
Vol
AT/CH
4A/TCl/1
INE
B/M
SOIL STABILIZATION BLANKETS/MATTING
631
' '
(sf)
3.39
�E
Low Point
465.0
18
/3
//
18 324.0
O
��� `iAiG��4/'�j
708
O
1:1 side slope
deYl
0
LU
Bottom of Weir:
469.0
26
O
26 676.0 2000.0
74.1 wet/
O
2:1 side slope
Q
~
Z
-0
z
/
L
Top of Weir
471.1
34.4
/
34.4 1183.4 1952.3
72.3 dr/y
Bio- liltcr Sizing��
68500 sf impervious 05r=343 sf rrq
450 O bottom of weir
w
Q
Weir Length (ft)
: 6.2
sf provided
Bio -Filter Planting
O
Weir Height (ft)
: 2.0
a
450 sf o 400/oc = 4 plants
1 1.5'cal mix Red Maple/Pin Oak
X
INTX /
Top of Berm:
472.1
mix Red Osier Dogwood/Spice Bush
SITE
10+OQ
Top of Weir:
471.1
M
>
\
Berm Width (ft):
2.5
A
STI
Lo
24 hours prior to backfilling the blofiltor and
ENERGY DISSIPATOR
AFTER CONVERSION
I
/
request an inspection and approval
underdrain installation and the soil mix.
AMSM
(see detail)
TO R)IOFILTER
(
�S • I /
IS
S
Silt Trap #1 _ \
Drainage Area (ac) : 1.03 - \
Wet Storage Req (cy) : 69.01 \ \
Dry Storage Req (cy) : 69.01
Total Storage Req (cy): 138.02 \\ \ \
) Elev Side 1 Side 2 Area Vol \\ \ V0\1\
f (sf) (Cf)
Low Point 459.0 16 18 324.0 \ \ \
1: 1 side slope \
Bottom of Weir: 463.0 26 26 676.0 2000\.01 74.1
2: 1 side slope 1
/ Top of Weir 455.1 34.4 34.4 1183.4 195213\ 17�.
Weir Length (ft) : 6.2 \ \ 1 1 1 1
Weir Height (ft): 2.0 \ \ I 1
/fop of Berm: 466.1 \ \ \
Top/of Weir: 465.1 \ \ I I
Bgrm/Width (ft): 2.5 1 1 1 I I I I
D CI\ 1 1 //.<�\
g C 3 \ \ \ \ \ \ \
S1`
I '<� \ \ \ \ \\ \ \ \
\ 7'
�n
off= RE 42+2�gp
mt000
--A \/ / / / / ,teLIN
n,
O -' / /�d�0
- - - - - - - - -
I
xcp V16k25 \ �
Silt Trap #3~`oo o '
Drainage Area (ac\) : I \2.62 \ \ \ - - - -
Wet Storage \Req (o\y) : 175.54
Dry Storage Req (cyj: 175.\54 \ \ \ \ LOT 9
Total StoCage Req (cy): 3511.O� /
\ Elev Side 1I \Sige 2 Ar a Vol \ Vol \ \ \ - - _ /
01
cf)
Law Poing \ 484.0" 3� 31� 61.a \ \ - _ - _ _ -
IV
1- 1vside slopev 1\ A I V ` - - _ - _ k
Bottorff of Weir: X488.0 39/ 39 1 1.0 \464.0 \183.9 wwet - - - - - - - - -
90 3:1 sid\e slop \ \ \ \ \ \ to
,,Top of Wdir 490.3 52.8 I \52.8 2717.8 5955.2 1`83.5 dry - - - -n 03
c
W`6ir Length (ft): 15.7/ \ I \ \ \ - - - - - - - to \ i
Weile Height \(ft) : -2.,3 /I \ 1 Nn
Top off Berm: \ 491.3
- - Top of \Weir: 490.3
Berm Width (ft)' .5
co LIMITS OF DISTURBANCE
STS' I 1
rn
C� _ v /) \\/' LOT 4'
orn
SOD TURF COVER
3: 1 CLEAN-OUT
W/WA CAP ERTIGHT
I inm C-onoATnl CDA\/C-I
3: 1
2.5'
TOP OF BERM
TOP OF WEIR
TOPSOIL 6 SAND
SAND: 0.02-0.04"
2 0 (ASTM C-33 FINE)
(MUST BE INSPECTED BY
WATER RESOURCES MANAGER 6
EROSION CONTROL INSPECTOR) 6'' NDN -PERFORATED
(see note #2 below) PVC PIPE AT 1%
3: 1
4 -6 I -L -ml UMMILu UiUI-iL I LH L;HU55 5)LL I iUIN
PVC PIPE AT 1% (AASHTO M43, 1/2''-1'')
SLOPE (MIN) WRAPPED IN FILTER FABRIC STORMWAIER/BMP NOTES
1. BMP is not to be constructed until the site is adequately stabilized, according to Water Resources Personnel (434-296-5861).
2. The bio -filter soil mix must be the Luck Bio -filter Mix available from Luck Stone or a tested and approved equivalent.
For addional information contact Water Resoruces Personnel (434-296-5661).
BMP
PLANTING SCHEDULE
O
NUM
SIZE
SPECIES
TEMP. STONE CONST. ENTRANCE
VICINITY MAP
15''
Red Osier Dogwoo
O4
2
1.5" Cal
RED MAPLE/PIN OA
DD
7
18"
SPICEBUSH
SOD TURF COVER
3: 1 CLEAN-OUT
W/WA CAP ERTIGHT
I inm C-onoATnl CDA\/C-I
3: 1
2.5'
TOP OF BERM
TOP OF WEIR
TOPSOIL 6 SAND
SAND: 0.02-0.04"
2 0 (ASTM C-33 FINE)
(MUST BE INSPECTED BY
WATER RESOURCES MANAGER 6
EROSION CONTROL INSPECTOR) 6'' NDN -PERFORATED
(see note #2 below) PVC PIPE AT 1%
3: 1
4 -6 I -L -ml UMMILu UiUI-iL I LH L;HU55 5)LL I iUIN
PVC PIPE AT 1% (AASHTO M43, 1/2''-1'')
SLOPE (MIN) WRAPPED IN FILTER FABRIC STORMWAIER/BMP NOTES
1. BMP is not to be constructed until the site is adequately stabilized, according to Water Resources Personnel (434-296-5861).
2. The bio -filter soil mix must be the Luck Bio -filter Mix available from Luck Stone or a tested and approved equivalent.
For addional information contact Water Resoruces Personnel (434-296-5661).
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 DEVELPMENT 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 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
regarless of the sale of any lot.
LIMITS OF DISTUP2)ANC
/
4;p' _ A
/n4AT,CNIL)NE.
TEMPORARY PERMANENT
Sediment Trap To Stormwater BMP Construction Notes
I. 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 . Prior to installation, the
location and orientation of the trench shall be field
determined by the County and the Contractor.
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. -
E&SC LEGEND
m
L
3
m
OD
^
m
ENiSC STD . 6
SPEC i
CE
TEMP. STONE CONST. ENTRANCE
VICINITY MAP
SF
SILT FENCE
3.051
CIP
e
3.06.
DD
TEMPORARY DIVERSION DIKE
3.09
ST
TEMPORARY SEDIMENT TRAP
3.13
TSD
TEMPORARY SLOPE DRAIN
3.15
OP
R,10 -FILTER
6'NON- PERFORATED PVC
3.18
CD
ROCK CHECK DAMS
3.20
LS
4 OR
PIPED POSITVE SLOPE
3.21
TO
TOPSOILING
3.30
TS
TEMPORARY SEEDING
3.31
PS
PERMANENT SEEDING
3.32
SO
SODDING
3.33
MU
AT/CH
4A/TCl/1
INE
B/M
SOIL STABILIZATION BLANKETS/MATTING
631
' '
' '
3.39
�E
O
LL
/3
//
i�
O
��� `iAiG��4/'�j
708
O
deYl
0
LU
L
W
Q
O
Cc
__J
O
0
Q
~
Z
-0
z
OU
L
m
Lin
/
/
SCP
(s
f
Bio- liltcr Sizing��
68500 sf impervious 05r=343 sf rrq
450 O bottom of weir
w
Q
Z
sf provided
Bio -Filter Planting
O
/
a
450 sf o 400/oc = 4 plants
1 1.5'cal mix Red Maple/Pin Oak
X
[n
o
Er
mix Red Osier Dogwood/Spice Bush
SITE
Lin
w
M
>
Contractor shall contact the water resources inspector
an
A
STI
Lo
24 hours prior to backfilling the blofiltor and
ENERGY DISSIPATOR
AFTER CONVERSION
in
request an inspection and approval
underdrain installation and the soil mix.
AMSM
(see detail)
TO R)IOFILTER
During construction STI, ST2 9 ST 3 will act as silt trips.
IS
S
210 -FILTER
4 OR 6' PERFORATED PVC
After site is stabilized, silt traps will be converted la
bio -filters (see details). Silt to be cleaned out, underdiam
631
I ON
705 �J/V�
m
PIPEo POSITVE SLOPE
nstalled, soil mix added and cover installed.
U
�
WITH
CLEANOUTS EVERY 50'
rn
w
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 DEVELPMENT 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 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
regarless of the sale of any lot.
LIMITS OF DISTUP2)ANC
/
4;p' _ A
/n4AT,CNIL)NE.
TEMPORARY PERMANENT
Sediment Trap To Stormwater BMP Construction Notes
I. 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 . Prior to installation, the
location and orientation of the trench shall be field
determined by the County and the Contractor.
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. -
ENERGY DISSIPATOR DETAIL
NOTE: BMP SILT BASIN RETROFIT IS NOT TO BE INSTALLED
UNTIL THE SITE IS SUBSTANTIALLY STAILIZED ACCORDING
TO THE E&S INSPECTOR AND WATER RESOURCES MANAGER.
2' MIN: 50% SAND, 30% TOPSOIL, 20% LEAF MULCH
(SAND: 0.02 0.04'', ASTM C33 FINE)
STONE TOP OF BERM
WEIR
SIDE SLOPES REGRADED
-,, TO 3,1 (MAX)
1' MIN. UNDERDRAIN GRAVEL \
(AASHTO M43, 0.5-11
WRAPPED IN FILTER CLOTH
REMOVE SILT N SEDIMENT AFTER FINAL STABILIZATION
REPLACE WITH LOAM OR GRANULAR EARTH FILL
PROFILE
BMP SEDIMENT TRAP RETROFIT
(AFTER CONSTRUCTION)
or
SCALE : 1" = 4GReviewed and Approved b
Community Development Npartme
Date: 6" 2.-, Q S'
IW- T. r r
/I�:"•�'
Hardware River Farms
Erosion/Sediment Control Narrative
April 14, 2005
PROJECT DESCRIPTION
The project consists of construction of a road for a rural, large lot subdivision. The total
disturbance for this site is 2.5 acres.
EXISTING SITE CONDITIONS
The site is mostly wooded along the Proposed road.
ADJACENT PROPERTY
The road enters the project from state route 631 (Old Lynchburg Road) to the north, the
Hardwore River circles the property to the east and other rural parcels surround the
property.
OFFSITE AREAS
No off-site areas will be disturbed.
SOILS
6raddock Loam on 7-15% slopes is a deep,strongly sloping, well drained to excessively
drained soil found 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 loom 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.
2:1 slopes on Lot 1.
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 (VESCH).
STRUCTURAL PRACTICES
1. Construction Entrance- 3.02
A temporary paved construction entrance shall be installed at the beginning of the project.
2. Silt Fence- 3.05
A temporary sediment barrier consisting of a synthetic filter fabric stretched across and
attached to supporting posts and entrenched.
3. Culvert Inlet Protection- 3.08
A temporary sediment filter located at the inlet to culverts.
4. Temporary Sediment Trap - 3.13
A small ponding area, formed by construction an earthen embankment with a stone outlet
across a drainage swale.
VEGETATIVE PRACTICES
1. Temporary Seeding - 3.31
Establishment of temporary vegetative cover on disturbed areas by seeding with oppr0o riate
ropidly growing plants on sites thot will not be brought to final grade for aeriods of 3
days to one year. German Millet at 60 Ib./ac., Weeping Lovrgrass at 3 lb./ac., Korean
Lospodeza at 20 Ib./ac.
Temporary seeding shall be fertilized. Fertilizer shall be applied at a rote of 600
lbs/acre of 10-20-10 according to the handbook. The builder may save considerable funds by
having the 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/acre.
3. Dust Control- 3.39
Dust control Measures shall be utilized throughout this site when necessary. Ty [Gal
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 con begin and end as quickly
as possible.
2. Sediment trapping measures shall be installed as a first step 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 whlcb 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. E Spec. 3.32 of The Virginia Erosion E Sediment Control Handbook. 5-20-10 fertilizer
shall be applied at the rate of 1000 Ib/oc and lime at 2 tons/ac. Permanently seeded areas
shall be protected during establishment with straw mulch (2 tons/ac).
STORMWATER MANAGEMENT
This is a rural subdivision with negligible change in stormwater peak flows. Water quality
will be enhanced by converting the silt traps to bio -filters once the site is stabilized.
MAINTENANCE
In general, all erosion and sediment control measures will be, checked weekly and after each
significant rainfall. The following items will be checked in particular:
11 The sediment traps and basins will be cleaned and maintained according to the VESCH.
2) All gravel outlets will be checked 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 fence will be checked regularly for undermining or deterioration of the fabric and
repaired as required. Sediment shall be removed when the level of sediment deposition
reaches half way to the top of the barrier.
4) All seeded areas will be checked regularly to see that a good stand is maintained. Areas
should be fertilized and reseeded as needed.
MS -1 Stabilization of Denuded Areas and Soil Stockpiles
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 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 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 -4 Timing and stabilization of Sediment Trapping Measures
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 up-slope land disturbance takes place.
MS- 5 Stabilization Measures
Stabilization measures shall be, applied to earthen structures 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
mode to minimize the transport of sediment by (vehicular) tracking onto the paved surface.
Where sediment is transported onto a public road surfoce, 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.
GRAPHIC SCALE
W. THOMAS MUNCASTER, JR.
n CERT. NO. 16242 Q
0 50 100 150
pAOFESSIO)
V
E&SC LEGEND
m
L
3
m
OD
^
m
ENiSC STD . 6
SPEC i
CE
TEMP. STONE CONST. ENTRANCE
3.021
SF
SILT FENCE
3.051
CIP
CULVERT INLET PROTECTION
3.06.
DD
TEMPORARY DIVERSION DIKE
3.09
ST
TEMPORARY SEDIMENT TRAP
3.13
TSD
TEMPORARY SLOPE DRAIN
3.15
OP
OUTLET PROTECTION
3.18
CD
ROCK CHECK DAMS
3.20
LS
LEVEL SPREADER
3.21
TO
TOPSOILING
3.30
TS
TEMPORARY SEEDING
3.31
PS
PERMANENT SEEDING
3.32
SO
SODDING
3.33
MU
MULCHING
3.35
B/M
SOIL STABILIZATION BLANKETS/MATTING
3.36
DC
DUST CONTROL
3.39
ENERGY DISSIPATOR DETAIL
NOTE: BMP SILT BASIN RETROFIT IS NOT TO BE INSTALLED
UNTIL THE SITE IS SUBSTANTIALLY STAILIZED ACCORDING
TO THE E&S INSPECTOR AND WATER RESOURCES MANAGER.
2' MIN: 50% SAND, 30% TOPSOIL, 20% LEAF MULCH
(SAND: 0.02 0.04'', ASTM C33 FINE)
STONE TOP OF BERM
WEIR
SIDE SLOPES REGRADED
-,, TO 3,1 (MAX)
1' MIN. UNDERDRAIN GRAVEL \
(AASHTO M43, 0.5-11
WRAPPED IN FILTER CLOTH
REMOVE SILT N SEDIMENT AFTER FINAL STABILIZATION
REPLACE WITH LOAM OR GRANULAR EARTH FILL
PROFILE
BMP SEDIMENT TRAP RETROFIT
(AFTER CONSTRUCTION)
or
SCALE : 1" = 4GReviewed and Approved b
Community Development Npartme
Date: 6" 2.-, Q S'
IW- T. r r
/I�:"•�'
Hardware River Farms
Erosion/Sediment Control Narrative
April 14, 2005
PROJECT DESCRIPTION
The project consists of construction of a road for a rural, large lot subdivision. The total
disturbance for this site is 2.5 acres.
EXISTING SITE CONDITIONS
The site is mostly wooded along the Proposed road.
ADJACENT PROPERTY
The road enters the project from state route 631 (Old Lynchburg Road) to the north, the
Hardwore River circles the property to the east and other rural parcels surround the
property.
OFFSITE AREAS
No off-site areas will be disturbed.
SOILS
6raddock Loam on 7-15% slopes is a deep,strongly sloping, well drained to excessively
drained soil found 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 loom 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.
2:1 slopes on Lot 1.
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 (VESCH).
STRUCTURAL PRACTICES
1. Construction Entrance- 3.02
A temporary paved construction entrance shall be installed at the beginning of the project.
2. Silt Fence- 3.05
A temporary sediment barrier consisting of a synthetic filter fabric stretched across and
attached to supporting posts and entrenched.
3. Culvert Inlet Protection- 3.08
A temporary sediment filter located at the inlet to culverts.
4. Temporary Sediment Trap - 3.13
A small ponding area, formed by construction an earthen embankment with a stone outlet
across a drainage swale.
VEGETATIVE PRACTICES
1. Temporary Seeding - 3.31
Establishment of temporary vegetative cover on disturbed areas by seeding with oppr0o riate
ropidly growing plants on sites thot will not be brought to final grade for aeriods of 3
days to one year. German Millet at 60 Ib./ac., Weeping Lovrgrass at 3 lb./ac., Korean
Lospodeza at 20 Ib./ac.
Temporary seeding shall be fertilized. Fertilizer shall be applied at a rote of 600
lbs/acre of 10-20-10 according to the handbook. The builder may save considerable funds by
having the 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/acre.
3. Dust Control- 3.39
Dust control Measures shall be utilized throughout this site when necessary. Ty [Gal
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 con begin and end as quickly
as possible.
2. Sediment trapping measures shall be installed as a first step 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 whlcb 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. E Spec. 3.32 of The Virginia Erosion E Sediment Control Handbook. 5-20-10 fertilizer
shall be applied at the rate of 1000 Ib/oc and lime at 2 tons/ac. Permanently seeded areas
shall be protected during establishment with straw mulch (2 tons/ac).
STORMWATER MANAGEMENT
This is a rural subdivision with negligible change in stormwater peak flows. Water quality
will be enhanced by converting the silt traps to bio -filters once the site is stabilized.
MAINTENANCE
In general, all erosion and sediment control measures will be, checked weekly and after each
significant rainfall. The following items will be checked in particular:
11 The sediment traps and basins will be cleaned and maintained according to the VESCH.
2) All gravel outlets will be checked 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 fence will be checked regularly for undermining or deterioration of the fabric and
repaired as required. Sediment shall be removed when the level of sediment deposition
reaches half way to the top of the barrier.
4) All seeded areas will be checked regularly to see that a good stand is maintained. Areas
should be fertilized and reseeded as needed.
MS -1 Stabilization of Denuded Areas and Soil Stockpiles
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 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 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 -4 Timing and stabilization of Sediment Trapping Measures
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 up-slope land disturbance takes place.
MS- 5 Stabilization Measures
Stabilization measures shall be, applied to earthen structures 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
mode to minimize the transport of sediment by (vehicular) tracking onto the paved surface.
Where sediment is transported onto a public road surfoce, 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.
GRAPHIC SCALE
W. THOMAS MUNCASTER, JR.
n CERT. NO. 16242 Q
0 50 100 150
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PROFILE
ENERGY DISSIPATOR DETAIL
NOTE: BMP SILT BASIN RETROFIT IS NOT TO BE INSTALLED
UNTIL THE SITE IS SUBSTANTIALLY STAILIZED ACCORDING
TO THE E&S INSPECTOR AND WATER RESOURCES MANAGER.
2' MIN: 50% SAND, 30% TOPSOIL, 20% LEAF MULCH
(SAND: 0.02 0.04'', ASTM C33 FINE)
STONE TOP OF BERM
WEIR
SIDE SLOPES REGRADED
-,, TO 3,1 (MAX)
1' MIN. UNDERDRAIN GRAVEL \
(AASHTO M43, 0.5-11
WRAPPED IN FILTER CLOTH
REMOVE SILT N SEDIMENT AFTER FINAL STABILIZATION
REPLACE WITH LOAM OR GRANULAR EARTH FILL
PROFILE
BMP SEDIMENT TRAP RETROFIT
(AFTER CONSTRUCTION)
or
SCALE : 1" = 4GReviewed and Approved b
Community Development Npartme
Date: 6" 2.-, Q S'
IW- T. r r
/I�:"•�'
Hardware River Farms
Erosion/Sediment Control Narrative
April 14, 2005
PROJECT DESCRIPTION
The project consists of construction of a road for a rural, large lot subdivision. The total
disturbance for this site is 2.5 acres.
EXISTING SITE CONDITIONS
The site is mostly wooded along the Proposed road.
ADJACENT PROPERTY
The road enters the project from state route 631 (Old Lynchburg Road) to the north, the
Hardwore River circles the property to the east and other rural parcels surround the
property.
OFFSITE AREAS
No off-site areas will be disturbed.
SOILS
6raddock Loam on 7-15% slopes is a deep,strongly sloping, well drained to excessively
drained soil found 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 loom 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.
2:1 slopes on Lot 1.
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 (VESCH).
STRUCTURAL PRACTICES
1. Construction Entrance- 3.02
A temporary paved construction entrance shall be installed at the beginning of the project.
2. Silt Fence- 3.05
A temporary sediment barrier consisting of a synthetic filter fabric stretched across and
attached to supporting posts and entrenched.
3. Culvert Inlet Protection- 3.08
A temporary sediment filter located at the inlet to culverts.
4. Temporary Sediment Trap - 3.13
A small ponding area, formed by construction an earthen embankment with a stone outlet
across a drainage swale.
VEGETATIVE PRACTICES
1. Temporary Seeding - 3.31
Establishment of temporary vegetative cover on disturbed areas by seeding with oppr0o riate
ropidly growing plants on sites thot will not be brought to final grade for aeriods of 3
days to one year. German Millet at 60 Ib./ac., Weeping Lovrgrass at 3 lb./ac., Korean
Lospodeza at 20 Ib./ac.
Temporary seeding shall be fertilized. Fertilizer shall be applied at a rote of 600
lbs/acre of 10-20-10 according to the handbook. The builder may save considerable funds by
having the 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/acre.
3. Dust Control- 3.39
Dust control Measures shall be utilized throughout this site when necessary. Ty [Gal
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 con begin and end as quickly
as possible.
2. Sediment trapping measures shall be installed as a first step 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 whlcb 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. E Spec. 3.32 of The Virginia Erosion E Sediment Control Handbook. 5-20-10 fertilizer
shall be applied at the rate of 1000 Ib/oc and lime at 2 tons/ac. Permanently seeded areas
shall be protected during establishment with straw mulch (2 tons/ac).
STORMWATER MANAGEMENT
This is a rural subdivision with negligible change in stormwater peak flows. Water quality
will be enhanced by converting the silt traps to bio -filters once the site is stabilized.
MAINTENANCE
In general, all erosion and sediment control measures will be, checked weekly and after each
significant rainfall. The following items will be checked in particular:
11 The sediment traps and basins will be cleaned and maintained according to the VESCH.
2) All gravel outlets will be checked 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 fence will be checked regularly for undermining or deterioration of the fabric and
repaired as required. Sediment shall be removed when the level of sediment deposition
reaches half way to the top of the barrier.
4) All seeded areas will be checked regularly to see that a good stand is maintained. Areas
should be fertilized and reseeded as needed.
MS -1 Stabilization of Denuded Areas and Soil Stockpiles
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 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 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 -4 Timing and stabilization of Sediment Trapping Measures
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 up-slope land disturbance takes place.
MS- 5 Stabilization Measures
Stabilization measures shall be, applied to earthen structures 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
mode to minimize the transport of sediment by (vehicular) tracking onto the paved surface.
Where sediment is transported onto a public road surfoce, 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.
GRAPHIC SCALE
W. THOMAS MUNCASTER, JR.
n CERT. NO. 16242 Q
0 50 100 150
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FILE iEDIT
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