HomeMy WebLinkAboutWPO201300033 Plan - Stormwater Stormwater Management Plan 2006-02-17n `
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LI\`1I-SCIA I L)IINK I UK L) I- I F IL WALL NAG'K5
TYPICAL)
ONC.:.: WALX. I
i / \ 0 i 11
i _J L) it
EXISTING Ln
0
1
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BUILDING PE IPE O
I Z
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co
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I I I LTJ "`^• ,,,/ i J
i I Lu FF -4 6.6 ti J v
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I 16
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i [
a
cf X17
PLAYFIELD
cv
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I i i > /
i
i ICl-
STOCKPILE
d I i r
I - i I _ o_ G
r
T C PILEI
I
I
I \
S
AREA / I o N 161
LIMITS OF CLEARING X7 I 1 1'
I iII
I I I
I
i! /cEo. i M 1 LLJ
t XI II - i E
I .
z
Li L
h I
I ' \ \ /
Roof drains to BMP (1( / ON
J \
During construction basin will act as silt trap.
It shall be graded to subgrade.
I After seta is stabilized, trap will be converted to FF ELEV= 449.0
a bio -filter. Silt to be cleaned out, underdram I I
installed, sod mix added and cover installed. EXl \ 1
J i I WALK
PROPOSED
MULTI-PURPOSE
3.2
2 -HP FIRE
13. 5'i n WALL
I \ II 0' PUBLIC RO
100'x65' \
PHASE 2
I Q, FF -449.0' r I I
I
I EXISTING I /
ASPHALT
810 -FILA F_Rp- Q PLAY ARECJIIa
4 OR 6' FjERFORATED PVC v P z
7PIPEc POSITIVE SLOPE
WITH GLEANOUTS EVERY
i\ d o
810-FiLTER
4 OR 6'NON- PERFORAT D Pvc
E E Y PIPE® POSiTVE SLOPE _ ROPOSED NEW CLASSF OOMS ( 18 ' 444+6 \ 450+s EXIST ' G RAVEL
i seleto\ - - Con. Sidewalk , I 3
44\ \ Y : V \ -
Proposed
O
5
IW
X--- _ - - -- --- --
SAFETYr7 NCE
i I I l FOR TRE.E. ROTEGTION \ - \ \ \ _ -FOR TREEEPROTEGTION
6O' U( SLUR EBD \BUFFEIR
it
NOTE: ANY TREES WITHIN THE (1.0' UNDISTURBED BUFFER
i LIMITS OF CLEARING
I
THAT DIE WITHIN ONE YEAR OF THE RELEACE OF THE WPO POND
a Dainagge Area (qc) : 0.36 \MUST 8E REPLACED WITH THE SAME SPECIES -THAT DlED46' MIN HEIGHT).
I
1
W;t Storage Req(cy): 24.12 \ \ - €-XISHNU_STORM
Z Dray Stor age Req cy) : 24.12 _
DRAINAGE \
i
I \
JLu
Total Stvage Req\ (Cy) : 48.24 \ \
i _ \ STRUCTURES \
I \ o Ele\v Side 1 Side 2 Area, Vol VO., \ \ 1 I
I \ \ (
sf) - (cf) (c))
LOW Point 439.0 34 13.25 450.5 ( \
I y \ 1:1 Me slope
Bottom of Weer: 442.0 X40 19.25 770.0 1630.8 67.8 wet
I i 2.5:1 side slope
Top of Weir 443.2 46.0 24.65 1133.9 1142.3 42.3 dry
i
Weir Lenggth (ft) : 2.2 - i .._._ - \ \
k
o°'`°
i Weir HeiNt (ft) : 1 0
I \ Top of Berm: 444.0 \ ///
I
U) \ ` Top of Weir' 443.0101
X \ Berm Width ft) 3.0 \
Ile
R
TEMPORARY PERMANENT
ki
N° -
SOUTHERN PARKWAY(PT 11 5) (9 AR Sediment Trap To Stormwater BMP Construction No es6iI5t'
l8". 40• I i \ 1. All disturbed areas must be stabilized wit pavement or
4SH Op a good stand of vegetation prior to the con Ver ion of the
I I \ A minimum water top of 1 inch must be installed with a minimum 1 inch ballcock shutoff valve supplying a y G j trap to a stormwater BMP.
O 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 2. Accumulated sediment must be removed fr m the trap to a
entering storm drains, altches or water courses. ) depth .18 below the stone weir (see detail), the interior
v slopes of the trap regraded to 3:1 or fla ter, and the stone
Bio -Filter Sizing:
6844 +6500= 13344 sf impervious@5%
667 sf required
ce 770 sf provided
Bio -Filter Planting
770 sf @ 400/ac = 7 plants
Volume:
13344 sf @ 1" =1112 cf required
Temporary Construction Entrance )
The entrance and disturbance is
temporary and not a permanent
entrance to the area.
Waiver approved by the
Planning Commission on P g
August 23, 2005
i
i
of
67
weir r e p a i r e d if necessary.
3. De -watering Trench shall be insta ed in accordance with
the attached Sediment Trap to BMP P an and the De -
watering Trench Detail . Prior t installation, the
location and orientation of the Tench shat 1 be field
determined by David Hirschma Water Resources Manager) and
the Contractor.
Z
ENSC STD, G
a ion th d - t
CE TEMP. STONE CONST. ENTRANCE 3.02
SF
i Oy
3.05
CIP CULVERT INLET PROTECTION
Conveyance
DD TEMPORARY DIVERSION DIKE
Channel
L } N6 ?
L
TSD
L0
3.15
OP
X
3.18
CD ROCK CHECK DAMS 3.20'
LS LEVEL SPREADER
PLAN
TO TOPSOILING
TS TEMPORARY SEEDING
G
prop Hump i
Important)
PS PERMANENT SEEDING
G0"
Vegetation
SODDING 3.33
MU MULCHING
Original Grade
Trench cut out for
SOIL STABILIZATION BLANKETS/MATTING 3.36
Installation of riprop
DUST CONTROL 3.39
PROFILE
LI\`1I-SCIA I L)IINK I UK L) I- I F IL WALL NAG'K5
TYPICAL)
ONC.:.: WALX. I
i / \ 0 i 11
i _J L) it
EXISTING Ln
0
1
I
I
I
BUILDING PE IPE O
I Z
I
Q4
co
I y
19
I I I LTJ "`^• ,,,/ i J
i I Lu FF -4 6.6 ti J v
Q
I 16
i I CO
i [
a
cf X17
PLAYFIELD
cv
W 4 o a 1 11
I i i > /
i
i ICl-
STOCKPILE
d I i r
I - i I _ o_ G
r
T C PILEI
I
I
I \
S
AREA / I o N 161
LIMITS OF CLEARING X7 I 1 1'
I iII
I I I
I
i! /cEo. i M 1 LLJ
t XI II - i E
I .
z
Li L
h I
I ' \ \ /
Roof drains to BMP (1( / ON
J \
During construction basin will act as silt trap.
It shall be graded to subgrade.
I After seta is stabilized, trap will be converted to FF ELEV= 449.0
a bio -filter. Silt to be cleaned out, underdram I I
installed, sod mix added and cover installed. EXl \ 1
J i I WALK
PROPOSED
MULTI-PURPOSE
3.2
2 -HP FIRE
13. 5'i n WALL
I \ II 0' PUBLIC RO
100'x65' \
PHASE 2
I Q, FF -449.0' r I I
I
I EXISTING I /
ASPHALT
810 -FILA F_Rp- Q PLAY ARECJIIa
4 OR 6' FjERFORATED PVC v P z
7PIPEc POSITIVE SLOPE
WITH GLEANOUTS EVERY
i\ d o
810-FiLTER
4 OR 6'NON- PERFORAT D Pvc
E E Y PIPE® POSiTVE SLOPE _ ROPOSED NEW CLASSF OOMS ( 18 ' 444+6 \ 450+s EXIST ' G RAVEL
i seleto\ - - Con. Sidewalk , I 3
44\ \ Y : V \ -
Proposed
O
5
IW
X--- _ - - -- --- --
SAFETYr7 NCE
i I I l FOR TRE.E. ROTEGTION \ - \ \ \ _ -FOR TREEEPROTEGTION
6O' U( SLUR EBD \BUFFEIR
it
NOTE: ANY TREES WITHIN THE (1.0' UNDISTURBED BUFFER
i LIMITS OF CLEARING
I
THAT DIE WITHIN ONE YEAR OF THE RELEACE OF THE WPO POND
a Dainagge Area (qc) : 0.36 \MUST 8E REPLACED WITH THE SAME SPECIES -THAT DlED46' MIN HEIGHT).
I
1
W;t Storage Req(cy): 24.12 \ \ - €-XISHNU_STORM
Z Dray Stor age Req cy) : 24.12 _
DRAINAGE \
i
I \
JLu
Total Stvage Req\ (Cy) : 48.24 \ \
i _ \ STRUCTURES \
I \ o Ele\v Side 1 Side 2 Area, Vol VO., \ \ 1 I
I \ \ (
sf) - (cf) (c))
LOW Point 439.0 34 13.25 450.5 ( \
I y \ 1:1 Me slope
Bottom of Weer: 442.0 X40 19.25 770.0 1630.8 67.8 wet
I i 2.5:1 side slope
Top of Weir 443.2 46.0 24.65 1133.9 1142.3 42.3 dry
i
Weir Lenggth (ft) : 2.2 - i .._._ - \ \
k
o°'`°
i Weir HeiNt (ft) : 1 0
I \ Top of Berm: 444.0 \ ///
I
U) \ ` Top of Weir' 443.0101
X \ Berm Width ft) 3.0 \
Ile
R
TEMPORARY PERMANENT
ki
N° -
SOUTHERN PARKWAY(PT 11 5) (9 AR Sediment Trap To Stormwater BMP Construction No es6iI5t'
l8". 40• I i \ 1. All disturbed areas must be stabilized wit pavement or
4SH Op a good stand of vegetation prior to the con Ver ion of the
I I \ A minimum water top of 1 inch must be installed with a minimum 1 inch ballcock shutoff valve supplying a y G j trap to a stormwater BMP.
O 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 2. Accumulated sediment must be removed fr m the trap to a
entering storm drains, altches or water courses. ) depth .18 below the stone weir (see detail), the interior
v slopes of the trap regraded to 3:1 or fla ter, and the stone
Bio -Filter Sizing:
6844 +6500= 13344 sf impervious@5%
667 sf required
ce 770 sf provided
Bio -Filter Planting
770 sf @ 400/ac = 7 plants
Volume:
13344 sf @ 1" =1112 cf required
Temporary Construction Entrance )
The entrance and disturbance is
temporary and not a permanent
entrance to the area.
Waiver approved by the
Planning Commission on P g
August 23, 2005
i
i
of
i W. THOMAS MUNCASTER JR.
i n CERT. NO. 16242
A 2
aFQ4,
OFESS0
weir r e p a i r e d if necessary.
3. De -watering Trench shall be insta ed in accordance with
the attached Sediment Trap to BMP P an and the De -
watering Trench Detail . Prior t installation, the
location and orientation of the Tench shat 1 be field
determined by David Hirschma Water Resources Manager) and
the Contractor.
Z
ENSC STD, G
a ion th d - teeno ering trench, the bottom
1133.9 cf @ 443.2 provided9
1
SOUTHERN PARKWAY (RT 1165) EP 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
BENCHMARK: FF EX BUILDING (456.6')
mulch applied.
CHARLOTTESVILLE
I - 64 /
O
SITE Q
y V2
VICINITY MAP / 1' = 2000'1.
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-,?: 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 -H: 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.
Peabody School
Erosion/Sediment Control Narrative
September 19, 2005
PROJECT DESCRIPTION
The project consists of construction of a classroom addition to replace existing temporary classrooms and new multi-purpose
budding. The total disturbance for this site is 0.9 acres.
EXISTING SITE CONDITIONS
The school exists on site and most of the area In the vicinity of the addition has been previously cleared.
ADJACENT PROPERTY
TMP 76M(1) . 16 (Carolina Builders) is to the north, Stoney Ridge Road (Rt 1000), to the east, Southern Parkway (Rt 1165) to the
south and an tntermittenl: stream and Foxcroft Subdivision to the west.
OFFSITE AREAS
No off-site areas will b;; disturbed.
SOILS
undorthents, loamy
CRITICAL EROSION AREAS.
There are no critical erosion areas.
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. Outlet Protection - 3.18
Rlprchannel and/or si.;illing basins below storm drain outlets. Outlet protection shall be Installed on the outlet pipe as shown on
the F8SC plan immediately after installation.
4. Inlet Protection 33X77
A sediment filter or an excavated impounding area around a storm drain drop inlet or curb inlet. Inlet protection shall be installed
on the inlets Immediately -after installation to prevent Sediment compromisinge: tiolr capacity.
VEGETATIVE PRACTIC(-S
1. Temporary Seeding - 3.31
Establishment of temporory vegetative cover on disturbed areas by seeding with appropriate rapidly growing plants on sites that will
not be brought to final grade for periods of 30 days to one year. German Millet at 60 Ib./ac., Weeping Lovegrass at 3 Ib./ac.,
Korean Lespedezo at 20 Ib./ac.
Temporary seeding shall be fertilized. Fertilizer shall be applied at a rate of 600 lbs/acre of 10-20-10 according to the handbook.
The builder may save considerable funds by having the sod tested by VA TECH (kits are available at the extension office and the
test Casts $6.00).
2. Mulch - 3.35
Organic mulch shall be u;;ad 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. Typical measures Include but are not limited to,
irrigation, temporary seeding barriers. These measures will aid to the prevention of harmful airborne substances as well the effects
of wind erosion.
MANAGEMENT STRATEGIES
1. Construction should be sequenced so that grading operations can begin and end as quickly as possible.
2. Sediment trapping measures shall be installed as a first 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 sending or other stabilization will follow Immediately after grading.
5. Areas which are not to be disturbed will be clearly marked by flags, signs, etc.
PERMANENT STABILIZATION
All areas disturbed by construction will be stabilized with permanent seeding Immediately following finish grading. Seeding will be
done with Kentucky 31 Tall Fescue according to Std. 8 Spec. 3.32 of The Virginia Erosion @ Sediment Control Handbook. 5-20-10
fertilizer shall be applied at the rate of 1000 Ib/ac and lime at 2 tons/ac. Permanently seeded areas shall be protected during
establishment with straw mulch (2 tons/ac).
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:
1) The sediment traps and basins will be Gleaned 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 Sod Stockpiles
Permanent or temporary soil stabilization must be app(led to denuded areas within seven days after final grade is reached on any
portion of the site. Temporary sod stabilization shall be opIced within seven days to denuded areas that may not be at final
grade, but will remain dormant (undisturbed) for longer than O days. Permanent stabilization shall be applied to areas that are to
be left dormant for more than one year.
Soil stabilization refers I:o measure which protect soil from the erosive forces of raindrop Impact and flowing water. Applicable
practicns Include vegetative establishment, mulching, and the early application of gravel base on areas to be paved. Soil
stablllzation measures should be selected to be operapdate for the time of year, site conditions and estimated duration of use.
MS -4 Timing and stabdl:tatton 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-di.turbing activity and shall be made functional before up-slope land disturbance takes place. MS- 5 Stabilization Mcoz;ures
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 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 and of each day. Sediment shall be removed from the roads by shoveling or sweeping and transported to a sediment
control disposal area. Greet 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.
r>
3
WEIR TO 8E GROUTED
WHEN SILT TRAP
TOP OF BERM = 444' IS CONVERTED TO PIMP
2: 1 2: 1
SOD TURF COVER TOP OF WEIR = 443.2'
J _ 2.5:1 CLAN -OUT
W/WATERTIGHT
CAP
44250/50' III -III (I I -I I ' TOPSOIL & SAND Contractor shall contact the woter resources Inspector 24 hours prior
III=1 I=III=III=III 91 1=111 --SAND: 0.02-0.04" to backfilling the biofilter and request an Inspection and approval of
IEI -I I IEI El I 1=1IEI 2. 0' (
MUSTSTM
BE INSPECTED) BY the underdram mstallatmo and the soil mix.
III-III-) -III EROSION
COWATER
ONTROL INSPECTOR) 6" NDN -PERFORATED
see note #2 below) PVC PIPE AT 1%
HT
4'-6" PERF ED UNOERDRAIN GRAVEL
BIOFILTER CROSS SECTIONPVCPIPEAT17: (AASHTO M4=', 1/2"-1")
SLOPE (MIN) WRAPPED IN FILTER FABRIC STORMWATER/BMP NOTES
1 B P atfav S ite bg'cong rutted until the site is adequately stabilized, according to Water Resources Personnel (434-296-5861) 2 €Tstjg ltr 3 i,1}ter sc %2 mi.?i lnp be the Luck Bia-filter Mix available from Luck Stone or a tested and approved equivalent.
For' addional znf;orlasr c'o,ntact Water Resoruces Personnel (434-295-5861) .
3. The sand/soil mix
musty
lie stabilized with sod along with the trees and/or shrubs listed on the plan.
FE8 1
GRAPHIC SCALE 1"=20'
0 ;D0 4n Fn
E&SC LEGEND
LO Z
ENSC STD, G SPEC.
CE TEMP. STONE CONST. ENTRANCE 3.02
SF SILT FENCE 3.05
CIP CULVERT INLET PROTECTION 3.08
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 3.321
SO SODDING 3.33
MU MULCHING 3.35
8/M SOIL STABILIZATION BLANKETS/MATTING 3.36
DC DUST CONTROL 3.39
CHARLOTTESVILLE
I - 64 /
O
SITE Q
y V2
VICINITY MAP / 1' = 2000'1.
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-,?: 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 -H: 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.
Peabody School
Erosion/Sediment Control Narrative
September 19, 2005
PROJECT DESCRIPTION
The project consists of construction of a classroom addition to replace existing temporary classrooms and new multi-purpose
budding. The total disturbance for this site is 0.9 acres.
EXISTING SITE CONDITIONS
The school exists on site and most of the area In the vicinity of the addition has been previously cleared.
ADJACENT PROPERTY
TMP 76M(1) . 16 (Carolina Builders) is to the north, Stoney Ridge Road (Rt 1000), to the east, Southern Parkway (Rt 1165) to the
south and an tntermittenl: stream and Foxcroft Subdivision to the west.
OFFSITE AREAS
No off-site areas will b;; disturbed.
SOILS
undorthents, loamy
CRITICAL EROSION AREAS.
There are no critical erosion areas.
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. Outlet Protection - 3.18
Rlprchannel and/or si.;illing basins below storm drain outlets. Outlet protection shall be Installed on the outlet pipe as shown on
the F8SC plan immediately after installation.
4. Inlet Protection 33X77
A sediment filter or an excavated impounding area around a storm drain drop inlet or curb inlet. Inlet protection shall be installed
on the inlets Immediately -after installation to prevent Sediment compromisinge: tiolr capacity.
VEGETATIVE PRACTIC(-S
1. Temporary Seeding - 3.31
Establishment of temporory vegetative cover on disturbed areas by seeding with appropriate rapidly growing plants on sites that will
not be brought to final grade for periods of 30 days to one year. German Millet at 60 Ib./ac., Weeping Lovegrass at 3 Ib./ac.,
Korean Lespedezo at 20 Ib./ac.
Temporary seeding shall be fertilized. Fertilizer shall be applied at a rate of 600 lbs/acre of 10-20-10 according to the handbook.
The builder may save considerable funds by having the sod tested by VA TECH (kits are available at the extension office and the
test Casts $6.00).
2. Mulch - 3.35
Organic mulch shall be u;;ad 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. Typical measures Include but are not limited to,
irrigation, temporary seeding barriers. These measures will aid to the prevention of harmful airborne substances as well the effects
of wind erosion.
MANAGEMENT STRATEGIES
1. Construction should be sequenced so that grading operations can begin and end as quickly as possible.
2. Sediment trapping measures shall be installed as a first 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 sending or other stabilization will follow Immediately after grading.
5. Areas which are not to be disturbed will be clearly marked by flags, signs, etc.
PERMANENT STABILIZATION
All areas disturbed by construction will be stabilized with permanent seeding Immediately following finish grading. Seeding will be
done with Kentucky 31 Tall Fescue according to Std. 8 Spec. 3.32 of The Virginia Erosion @ Sediment Control Handbook. 5-20-10
fertilizer shall be applied at the rate of 1000 Ib/ac and lime at 2 tons/ac. Permanently seeded areas shall be protected during
establishment with straw mulch (2 tons/ac).
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:
1) The sediment traps and basins will be Gleaned 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 Sod Stockpiles
Permanent or temporary soil stabilization must be app(led to denuded areas within seven days after final grade is reached on any
portion of the site. Temporary sod stabilization shall be opIced within seven days to denuded areas that may not be at final
grade, but will remain dormant (undisturbed) for longer than O days. Permanent stabilization shall be applied to areas that are to
be left dormant for more than one year.
Soil stabilization refers I:o measure which protect soil from the erosive forces of raindrop Impact and flowing water. Applicable
practicns Include vegetative establishment, mulching, and the early application of gravel base on areas to be paved. Soil
stablllzation measures should be selected to be operapdate for the time of year, site conditions and estimated duration of use.
MS -4 Timing and stabdl:tatton 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-di.turbing activity and shall be made functional before up-slope land disturbance takes place. MS- 5 Stabilization Mcoz;ures
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 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 and of each day. Sediment shall be removed from the roads by shoveling or sweeping and transported to a sediment
control disposal area. Greet 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.
r>
3
WEIR TO 8E GROUTED
WHEN SILT TRAP
TOP OF BERM = 444' IS CONVERTED TO PIMP
2: 1 2: 1
SOD TURF COVER TOP OF WEIR = 443.2'
J _ 2.5:1 CLAN -OUT
W/WATERTIGHT
CAP
44250/50' III -III (I I -I I ' TOPSOIL & SAND Contractor shall contact the woter resources Inspector 24 hours prior
III=1 I=III=III=III 91 1=111 --SAND: 0.02-0.04" to backfilling the biofilter and request an Inspection and approval of
IEI -I I IEI El I 1=1IEI 2. 0' (
MUSTSTM
BE INSPECTED) BY the underdram mstallatmo and the soil mix.
III-III-) -III EROSION
COWATER
ONTROL INSPECTOR) 6" NDN -PERFORATED
see note #2 below) PVC PIPE AT 1%
HT
4'-6" PERF ED UNOERDRAIN GRAVEL
BIOFILTER CROSS SECTIONPVCPIPEAT17: (AASHTO M4=', 1/2"-1")
SLOPE (MIN) WRAPPED IN FILTER FABRIC STORMWATER/BMP NOTES
1 B P atfav S ite bg'cong rutted until the site is adequately stabilized, according to Water Resources Personnel (434-296-5861) 2 €Tstjg ltr 3 i,1}ter sc %2 mi.?i lnp be the Luck Bia-filter Mix available from Luck Stone or a tested and approved equivalent.
For' addional znf;orlasr c'o,ntact Water Resoruces Personnel (434-295-5861) .
3. The sand/soil mix
musty
lie stabilized with sod along with the trees and/or shrubs listed on the plan.
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