HomeMy WebLinkAboutWPO202300022 Plan - VSMP 2023-04-12 (2)Erosion and Sediment Control Narrative For:
Keswick School Storage Shed
505 Little Keswick Lane
TM 80 Parcel 110
Albemarle County, VA
HUC: Rivanno River - Carroll Creek 020802040404
LAT: 38.021103N LONG: 78.35547W
Project Description: The proposed work involves the construction of a 2,160 sf
storage building and gravel access way. The project area is in the center of
the Keswick School property, just east of Keswick Rd. The total area of the
parcel is 21.62 acres. The total on -site disturbed area is 0.1 acre. There is
a net increase of 3,285 sf in impervious area. Work will begin in Spring of
2023.
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 field and
generally slopes to the south at 2 to 5%. The overall pre and post drainage
patterns will be the some.
Adjacent Property: The property is surrounded by large residential lots and
wooded areas.
Off -site Areas: No off -site areas will be involved in this project.
Soils: 51 B-Bugley Channery silt loam, 0.20 K-Factor, Group D soil
51 C-Bu le Channe silt loam 0.20 K-Factor, Group D soil
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Critical Erosion Areas: There are no critical erosion areas in the project area.
Soil Stockpiles: No mass grading is proposed, thus a stockpile will not be
utilized.
Erosion and Sediment Control Measures:
Unless otherwise indicated, all vegetative and structural erosion and sediment
control practices will be constructed and maintained according to minimum
standards and specifications of the Virginia Erosion and Sediment Control
Handbook. Additional measures may be required during construction by the
Erosion Control Inspector, as needed.
Structural Practices:
Construction Entrance: (CE) 3.02 (To be installed where construction site
traffic exits the project area to remove soil from tires prior to travel on
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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 runoff from crossing disturbed
areas.)
Permanent Seeding (PS) 3.32 Establishment of perennial vegetative cover
by planting seed where permanent, long-lived vegetative cover is needed on
fine -graded areas. (Permanent seeding will be provided on all disturbed areas
designated to be landscaped on the site plan within 7 days of final grading.)
Mulching (MU) 3.35 Application of plant residues to disturbed surfaces to
prevent erosion and reduce overland flow. Apply to all seeded areas. Refer to
Table 3.35-A on Sheet C-3.3 for application rates. (To be installed along with
Permanent Seeding)
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
man months lime is not necessary. If necessary, the amount will be
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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, uniform)
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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 34 to �1h 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.
Keswick School Storage Shed
W P02023-xxxxx
Management Strategies: Construction should be sequenced so that grading
operations can begin and end as quickly as possible. Areas that are not to
be disturbed shall be clearly marked by the placement of the erosion control
measures prior to construction. The job superintendent shall be responsible for
the installation and maintenance of all erosion and sediment measures.
Where construction vehicle access routes intersect paved public roads,
provisions shall be made to minimize the transport of sediment by vehicular
trackingonto the paved surface. Where sediment is transported onto a public
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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
any land disturbing activity and shall be made functional before upslope land
disturbance takes place. Stabilization measures shall be applied to earthen
structures such as dams, dikes, and diversions immediately after installation.
Disposal of Temporary Measures: All temporary erosion and sediment control
measures shall be removed within 30 days after final site stabilization or after
the temporary measures are no longer needed, unless otherwise authorized by
the local program administrator.
Trapped sediment and the disturbed soil areas resulting from the disposition of
temporary measures shall be removed and replaced with suitably compacted
soils, or, where applicable, permanently stabilized to prevent further erosion and
sedimentation.
Maintenance: All erosion and 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 Ian a rovin authority must be notified one week prior to the
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pre-constructionconference, one week prior to the commencement of land
disturbing activity, and one weekprior to the final inspection.
2. All erosion and sediment control measures will be constructed and
maintained according to minimum standards and specifications of the Virginia
Erosion and Sediment Control Handbook and Virginia Regulations VR 625-02-00
Erosion and Sediment Control Regulations.
3. All erosion and sediment control measures are to be placed prior to or as
the first step in clearing.
4. A copy of the approved erosion and sediment control plan shall be
maintained on the site at all times.
5. Prior to commencing land disturbing activities in areas other than indicated
on these plans (including, but not limited to, off -site borrow or waste areas),
the contractor shall submit a supplementary erosion control plan to the owner
for review and approval by the plan approving authority.
6. The contractor is responsible for installation of any additional erosion control
measures necessary to prevent erosion and sedimentation as determined by the
plan approving authority.
7. All disturbed areas are to drain to approved sediment control measures at
all times during land disturbing activities and during site development until final
stabilization is achieved.
8. During dewatering operations, water will be pumped into an approved filtering
device.
9. The contractor shall inspect all erosion control measures periodically and
after each runoff producing rainfall event. Any necessary repairs or cleanup to
maintain the effectiveness of the erosion control devices shall be made
immediately.
10. All fill material to be taken from an approved, designated borrow area.
11. All waste materials shall be taken to an approved waste area. Earth fill
shall be inert materials only, free of roots, stumps, wood, rubbish, and other
debris.
12. Borrow or waste areas are to be reclaimed within 7 days of completion per
Zoning Ordinance section 5.1.28.
13. All inert materials shall be transported in compliance with section 13-301
of the Code of Albemarle.
14. Borrow, fill or waste activity involving industrial -type power equipment shall
be limited to the hours of 7:00am to 9:00pm.
15. 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 of slides, sinking, or collapse.
16. The developer shall reserve the right to install, maintain, remove or convert
to permanent stormwater management facilities where applicable all erosion
control measures required by this plan regardless of the sale of any lot, unit,
building or other portion of the property.
17. Temporary stabilization shall be temporary seeding and mulching. Seeding is
to be at 75 Ibs/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 County erosion control inspector.
18. 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.
19. Maintenance: All measures are to be inspected weekly and after each
rainfall. Any damage or clogging to structural measures is to be repair
immediately. Silt traps are to be cleaned when 50% of the wet storage volume
is filled with sediment. All seeded areas are to be 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.
20. All temporary erosion and sediment control measures are to be removed
within 30 days of final site stabilization, when measures are no longer needed,
subject to approval by the County erosion control inspector.
MINIMUM STANDARDS
MS-1 Permanent or temporary soil stabilization must be applied to denuded
areas within seven days after final grade is reached on any portion of the
site. Temporary soil stabilization shall be applied within seven days to
denuded areas that may not be at final grade but will remain dormant
(undisturbed) for longer than 15 days. Permanent stabilization shall be
applied to areas that are to be left dormant for more than one year. Soil
stabilization refers to measures which protect soil from the erosive forces of
raindrop impact and flowing water. Applicable practices include vegetative
establishment, mulching, and the early application of gravel base on areas to
be paved. Soil stabilization measures should be selected to be appropriate
for the time of year, site conditions and estimated duration of use.
MS-2 During construction of the project, soil stockpiles and borrow areas shall
be stabilized or protected with sediment trapping measures. The applicant is
responsible for the temporary protection and permanent stabilization of all
soil stockpiles on site as well as borrow areas and soil intentionally
transported from the project site.
MS-3 A permanent vegetative cover shall be established on denuded areas not
otherwise permanently stabilized. Permanent vegetation shall not be
considered established until a ground cover is achieved that, is uniform,
mature enough to survive and will inhibit erosion.
MS-4 Sediment basins and traps, perimeter dikes, sediment barriers and other
measures intended to trap sediment shall be constructed as a first step in
any land -disturbing activity and shall be made functional before upslope land
disturbance takes place.
MS-5 Stabilization measures shall be applied to earthen structures such as
dams, dikes, traps, basins and diversions immediately after installation.
MS-6 Surface runoff from disturbed areas that is comprised of flow from
drainage areas greater than or equal to three acres shall be controlled by a
sediment basin. The sediment basin shall be designed and constructed to
accommodate the anticipated sediment loading from the land disturbing
activity. The outfall device or system design shall take into account the
total drainage area flowing through the disturbed area to be served by the
basin.
MS-7 Cut and fill slopes shall be constructed in a manner that will minimize
erosion. Slopes that are found to be eroding excessively within one year of
permanent stabilization shall be provided with additional slope stabilizing
measures until the problem is corrected.
MS-8 Concentrated runoff shall not flow down cut or fill slopes unless
contained within an adequate temporary or permanent channel, flume, or
slope drain structure.
MS-9 Whenever water seeps from a slope face, adequate drainage or other
protection shall be provided.
MS-10 All storm
sewer inlets
that are made operable during
construction shall
be protected
so that sediment -laden water cannot enter
the conveyance
system without first being
filtered or otherwise treated to
remove sediment.
MS-11 Before newly constructed stormwater conveyance channels are made
operational, adequate outlet protection and any required temporary or
permanent channel lining shall be installed in both the conveyance channel
and receiving channel.
MS-12 through 15 - Not applicable, no live watercourses.
MS-16 Underground utility lines shall be installed in accordance with the
following standards in addition to other applicable criteria:
a. No more than 500 linear feet of trench may P be opened at one
time.
b. Excavated material shall be placed on the uphill side of trenches.
c. Effluent from dewatering operations shall be filtered or passed through an
approved sediment trapping device, or both, and discharged in a manner
that does not adversely affect flowing streams or off -site property.
d. Restabilization shall be accomplished in accordance with these regulations.
e. Applicable safety regulations shall be complied with.
MS-17 Where construction vehicle access routes intersect paved public roads,
provisions shall be made to minimize the transport of sediment by vehicular
tracking onto the paved surface. Where sediment is transported onto a
public road surface, the road shall be cleaned thoroughly every four hours.
Sediment shall be removed from the roads by shoveling or sweeping and
transported to a sediment control disposal area. Street washing shall be
allowed only after sediment is removed in this manner.
MS-18 All temporary erosion and sediment control measures shall be removed
within 30 days after final site stabilization or after the temporary measures
are no longer needed, unless otherwise authorized by the local program
administrator. Trapped sediment and the disturbed soil areas resulting from
the disposition of temporary measures shall be permanently stabilized to
prevent further erosion and sedimentation.
MS-19 The increase in impervious area is less than 1% of the total watershed area.
(9VAC25-870-66 C-3-a).
VICINITY MAP
SCALE: 1 "=2,000'
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. Clear and grub trees. perform fine grading as required to restore an even
surface.
3. If the site will remain dormant for more than 15 days, provide temporary
seeding measures to stabilize the surface.
4. Apply mulching and permanent seeding on all permanently stabilized areas.
5. Remove silt fence after all disturbed areas are stabilized.
SITE
SITE DATA:
OWNER:
LITTLE KESWICK EDUCATION CORPORATION
PO BOX 24
KESWICK, VA 22947
LOCATION:
LITTLE KESWICK LANE
ALBEMARLE COUNTY, VA
MAGISTERIAL DISTRICT: RIVANNA
PLAN PREPARED BY:
B. CLARK GATHRIGHT, P.E.
100 10TH ST NE SUITE 200
CHAR LOTTESVI LLE, VA 22902
TOTAL PARCEL AREA: 21.62 AC.
ZONING: RA
SOURCE OF TOPOGRAPHY:
LINCOLN SURVEYING
PROJECT: NEW STORAGE BUILDING & TRAVELWAY
DISTURBED AREA: 0.1 ACRE
EXISTING IMPERVIOUS SURFACE: 8.67 ACRES
NEW IMPERVIOUS SURFACE: 8.74 ACRES
WATER QUANTITY:
LESS THAN 1% OF THE TOTAL WATERSHED
(9VAC25-870-66 C-3-A)
INCREASE IN SHEETFLOW VOLUME WILL NOT CAUSE
OR CONTRIBUTE TO EROSION, SEDIMENTATION, OR
FLOODING OF DOWN GRADIENT (9VAC25-870-66 D)
WATER QUALITY: 0.16 LB./YR NUTRIENT CREDIT
PURCHASE
CRITICAL SLOPES: NO CRITICAL SLOPES IN THE
PROJECT AREA.
TIMING OF CONSTRUCTION: SPRING 2023
DRAWING INDEX
1 C-3.0 TITLE SHEET & EROSION AND SEDIMENT CONTROL NARRATIVE
2 C-3.1 EROSION AND SEDIMENT CONTROL & SWM PLAN
3 C-3.2 EROSION AND SEDIMENT CONTROL DETAILS
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REVISIONS:
DATE:
04-10-2023
DRAWING NUMBER:
C-3*0
SHEET 1 OF 3
LEVEL SPREADER 1
LOCATION
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LINETYPE & SYMBOL LEGEND
EXISTING CONTOUR LINE
LIMIT OF GRADING
SOILTYPE BOUNDARY s
SOIL TYPE: 51 B BUGLEY CHANNERY SILT LOAM XXX
51 B BUGLEY CHANNERY SILT LOAM
CONSTRUCTION ENTRANCE 3.02 Q
SILT FENCE 3.05 S F X x
PERMANENT SEEDING 3.32 P S
MULCHING 3.35
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EROSION & SEDIMENT CONTROL PLAN Boundary, topography and physical information by Lincoln Surveying,
Topographic benchmark based on NAVD 88, dated 09-30-2021.
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REVISIONS:
DATE:
04-10-2023
DRAWING NUMBER:
C-301
SHEET 2 OF 3
STONE CONSTRUCTION
70' MIN,
EXISTING
PAVEMENT
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SOURCE: ADAPTED from 1983 Maryland Standards for Soil erosion and Sediment Control, and Va. DSWC
Plate 3.02-1
1 CONSTRUCTION ENTRANCE DETAILS
3.2J SCALE: NONE
1992
TABLE 3.35-A
ORGANIC MULCH MATERIALS AND APPLICATION RATES
RATES:
MULCHES:
NOTES:
Per Acre
Per 1000 sq. ft.
Straw or Hay
11; - 2 tons
70 - 90 lbs.
Free from weeds and coarse
(Minimum 2
matter. Must be anchored.
tons for
Spread with mulch blower
winter cover)
or by hand.
Fiber Mulch
Minimum
35 lbs.
Do not use as mulch for
1500 lbs.
winter cover or during hot,
dry periods.* Apply as
slurry.
Corn Stalks
4 - 6 tons
185 - 275 lbs.
Cut or shredded in 4-6"
}
lengths. Air-dried. Do not
use in fine turf areas. Apply
with mulch blower or by
hand.
Wood Chips
4 - 6 tons
185 - 275 lbs.
Free of coarse matter. Air-
dried. Treat with 12 lbs
I
nitrogen per ton. Do not
use in fine turf areas. Apply
with mulch blower, chip
handler, or by hand.
Bark Chips
50 - 70 cu.
1-2 cu. yds.
Free of coarse matter. Air -
or
yds.
dried. Do not use in fine
Shredded
turf areas. Apply with
Bark
mulch blower, chip handler,
or by hand.
* When fiber mulch is the only available mulch during periods when straw
should be used, apply at a minimum rate of 2000 lbs./ac. or 45 lbs./1000 sq. ft.
Source: Va. DSWC
4 '� TABLE 3.35-A
1.35
CONSTRUCTION
I SUPPORT)
1. SET POSTS I EXCAVATE A 4"X4" 2. STAPLE WIRE FENCING TO THE POSTS.
TRENCH OPE ALONG THE LINE
OF POSTS.
n❑
Jill
I � �\■IIII\ . �n /jj
\■un � tIl
1II � Z��1�II���1��dul�o�•BPI�
ICJ ' .� I\►��• I IIC�a, 1 ilil�! 1j1ju,�
d
TO THE WIRE 4. BACKIFILL AND COMPACT THE
FENCE I EXTEND IT INTO THE TRENCH. EXCAVATED
u
FIB In1
1(
,I J 'I
•,1 �P
ar f
=iill�r``01
01
_illl�l
EXTENSION
FILTER JFABRIC
49111
SOURCE:
enrood opted from Installation of Straw and Fabric Filter Barriers for Sediment C Sontrol,
2�SILT FENCE DETAILS
-3.2J SCALE: NONE
PUTS. 3.05-1
TABLE 3.32-C
SITE SPECIFIC SEEDING MIXTURES
FOR APPALACHIAN/MOUNTAIN AREA
Total lbs.
Minimum Care Lawn Per Acre
- Commercial or Residential 200-250 this.
- Kentucky 31 or Turf -Type Tall Fescue 90-100%
- Improved Perennial Ryegrass * 0-10%
- Kentucky Bluegrass 0-10%D
High -Maintenance Lawn
Minimum of three (3) up to five (5) varieties
of bluegrass from approved list for use in Virginia. 125 lbs.
General Slope (3:1 or less)
- Kentucky 31 Fescue 128 lbs.
- Red Top Grass 2 lbs.
- Seasonal Nurse Crop * * 20 lbs.
150 lbs.
Low -Maintenance Slope (Steeper than 3:1)
- Kentucky 31 Fescue 108 lbs.
- Red Top Grass 2 lbs.
- Seasonal Nurse Crop ** 20 lbs.
- Crownvetch *** 20 lbs.
150 lbs.
* Perennial Ryegrass will germinate faster and at lower soil temperatures than
fescue, thereby providing cover and erosion resistance for seedbed.
* * Use seasonal nurse crop in accordance with seeding dates as stated below:
March, April through May 15th .................... Annual Rye
May 16th through August 15th .................... Foxtail Millet
August 16th through September, October ............. Annual Rye
November through February ...................... Winter Rye
* * * if Flatpea is used, increase to 30 lbs,/acre. All legume seed must be properly
inoculated. Weeping Lovegrass may also be included in any slope or low -
maintenance mixture during warmer seeding periods; ads! 10-201hs/acLpinmixes.
5 TABLE 3.32-C
Is
3.32
REINFORCED
10 OZ. PVC
k
NOTES:
INSERT STAPLES AROUND
AROUND REBAR L-BRACKETS
INSERT CORNER STAKE TIE DOWNS
TYPICAL OF 4 CORNERS
1. THE WASHOUT SHALL BE INSTALLED PRIOR TO ANY USING MATERIALS THAT REQUIRE
WASHOUT ON THIS PROJECT.
2. AS NECESSARY, SIGNS SHALL BE PLACED THROUGHOUT THE SITE TO INDICATE THE
LOCATION OF THE WASHOUT.
3. THE WASHOUT AREA WILL BE REPLACED AS NECESSARY TO MAINTAIN CAPACITY FOR
LIQUID WASTE.
4. WASHOUT RESIDUE SHALL BE REMOVED FROM THE SITE AND DISPOSED OF AT AN
APPROVED WASTE FACILITY.
5. DO NOT WASHOUT INTO STORM DRAINS, OPEN DITCHES, STREETS, OR STREAMS.
6. AVOID DUMPING EXCESS CONCRETE IN NON -DESIGNATED DUMPING AREAS.
7. LOCATE WASHOUT AT LEAST 50- (15 METERS) FROM STORM DRAIN, OPEN DITCHES, OR
WATER BODIES.
8. THE WASHOUT SHALL BE USED ONLY FOR NON -HAZARDOUS WASTES.
PVC WASHOUT/SECONDARY
CONTAINMENT Boise, Idaho
tpa 208-890-0383
SPECIFICATIONS Washout outpak.com
3� CONCRETE WASHOUT DETAIL
DEQ Virginia Runoff Reduction Method ReDevelopment Compliance Spreadsheet - Version 3.0
❑ 2011 BMP Standards and Specifications M2013 Draft BMP Standards and Specifications
Project Name: Keswick School Storage Shed dew input cells
Date: 3/23/2023 catumtvalues
linear Develo mein Proect7 I No calculation cells
Site Information
Post -Development Project (Treatment Volume and Loads)
Enter Total Disturbed
Area (acres) --> 0.10
Check:
BMP Badjur Specifications List:
20L3 Drag
9eds & Sam
UneorprrrJect2
No
r r•
w
Land covrrereos eFFMedcedcwrecdy7
,/
r
r
TMaldlsturbedayea entered?
Pre-ReDevelopment land Cover (acres)
A Soils
BSoils
Cstill,
DSoils
Totals
Foreet/Opn space (acres) -undisturbed,
protected (ores o n au or reforested land
0.00
Managed red Jacobs) -disturbed, graded for
its or other but be mowed/managed
0.10
0,10
Impervious Cover (avp)
nDn
0.00
0.10
Post-Denfelopment Land Cover acres
ASolb
esoll•
CSo1N
OSoIY
Totals
Forest/open spar fares) - undisturbed,
protected fores o n saace or reforested land
0.00
11
0.00
Managed Tad (avp)-disturbed, stated for
Ns or other tudto be peopedid/monagged
0.01
0.01
Imparvbp Corr (eves)
0.09
0.09
Area Check
OIL
OK.
OK.
OK.
0.10
Constants
Runoff Coefndrmts Rr
Annual Rainfall(Inches)
43
ASolb
BSoils
Cselb
0solls
Target Rainfall Event arches)
1.00
Forest/Open Space
0.02
0.03
am
005
Tool Phosphorus n1s) EMC(mg/L)
0.26
Managed Turf
0.15
0.20
0.22
0,25
Total Nkrogen(TN) EMC(mid.)
1.86
Imervlous cover
0.95
1 0.95
0.95
095
Iranian TP Load (lb/acruh r)
0.41
PI turitless correction Factor)
0.90
LAND
COVER
SUMMARY POST
DEVELOPMENT
Land Cover Summory-Pre
Land Cover Summory-Post(Final)
Lwldrn swnmary~
Land OnewSranmpry-Ppat
Pre-ReOevelo ment
p
Listed
Adjusted'
Post Reber. a New Impervious
P
pine
PMAeDeveb nt
IOM-DMI man)NM Irbua
4 M
Forest/Open space Cover )acres)
0.00
0.00
Forest/Open space
0.00
ForeN/Cgm spew
Covr Oves
Cover(acres)0.00
Weighted parapet)
0.00
0.00
Weighted R (vest)
0.00
WWtd suffered
0.00
%Forest
ON
0%
%Forest
0%
%Far"
0%
Managed Tuff Cover (acres)
0.10
0.01
Managed Turf Cover
acres
0.01
ManagedTurf Cover
.
0.01
Weighted Rv(turn
0.20
0.20
Weighted RV (turn
0.20
Weighted t(Wrn
0.20
%Managed Turf
30D%
100%
%Managed Turf
10%
%Mamgad Turf
300%
Impervlous cover (.a.)
0.00
0.00
Impervious Cover
Dog
Ratio, mgMaus
0.00
Newlmpervlous cover
009
(acres)
Cover(a res)
(aces)
Ralropennous)
1 0.95
0.95
1 Rv(Impervious)
0.95
Rvomperdi
0.95
Rv(Impervlous)
0.95
%Impervlous
0%
0%
%Impervious
90%
%ImpeMous
0%
Total site Area )acres)
0.10
0.01
flpl site A. (avast
0.10
Tptel RaDev. Nh Arp
Tres
0.01
Site Rv
0.20
1 0.20
final PoeLDwsNeM
0.88
Moe. site Rr
0.20
Treatment Volume and Nutrient Load
Treatment Volume and
Pp[-peDlvelppment
Nutrient Load
Finalpost-
Pa11-0eveliganem
Pre-ReDevelopment Treatment Volume
O O011
0.0002
Development
0,0073
Treatment Vdume
0.0002
TmMm.m Volume
0.0071
(acre-k)
Trentmem Volume
(acre-k)
(swede)
(acre-k)
Post-ReDevelopment
Final Post-
Ppt-0ayabpinem
Pre-ReDevelopmmcee) Vdume
73
]
Development
318
Treatment Volume
7
TrebpntVoluma lcubk
310
(cuNhet)
Treatment Volume
I<ubk fees
(earl
(cubic few)
Post-ReDevelopment
ProanDswelepmem TP load
Final Post-
opt-UmMapmmtTP
0bilyr)
0.05
0.00
Development TP Load
0.20
WolnP)
0.00
Wed 0b/pl
020
(lb/yr)
(lbl r)•
Post-beDewbpmentTP
Preme loplent lord pwaFre
final Fall 111elopmenl TP
Irohcre/yr)
01,
oa6
Load per acre
lDo
Luzd peracre
oAs
Mavypl
Lib/acre/rd
Maw. Retludion Reeuiretl
Baseline TP Load (lb/,,)
(e41Re/aaehr applied to pre-reeeveldimenl area wdulue pervious
0,00
(eelow we-
to%
land proposed M new impervious coved
Reoevelopmem laaa)
'Adlusted Land CpyarSwpr on,.
TP Load Reduction
Tp bad Reduction
Re raid wwt/apmspocew
Required For
0.00
Required for New
O.lfi
aged b n Acrehintcovemlmspervious scover
mpoped N0l avppepmposM7orpwimpervbus rover.
Redeveloped Area
Impervious Area (Ib/yr)
(Ib/yr)
Ad/phtl had ac erpe kmnsfstem with Pp FNeOeve/apmemaveope(m(np
wrougue Chew Imperwav covert.
Column Ishowsbadred esdon requrkmentfornew Impervlous rover based on new
devebpmembod Omit a4l lbubc W/aobp)Post-
Development Requirement for
Site Area
TP Load Reduction Required (lb/yr)
0.16
Nitrogen Loads (informational Purposes
Only)
Final Post-DevelopmvnrN Led
Pre4hDevtlapmeMlN Well ob/yr)
0.33
(Post-ReDevelopmenta New
IA3
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Lic. No. 0 630
6,li--lb-2 '
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REVISIONS:
DATE:
04-10-2023
DRAWING NUMBER:
C-3*2
SHEET 3 OF 3