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| Meeting Minutes and Agenda | Building Permits | Calendar of Events | News Releases | Privacy Statement EROSION AND SEDIMENT CONTROL NARRATIVE Accelerated erosion will be
controlled by minimizing the amount of existing vegetative cover to be
removed, and providing temporary and permanent stabilization measures on
disturbed areas as soon as possible.
In general, stripping of vegetation, regrading
or other development is to be done in such a way that will minimize
erosion. The primary control for
capturing sediment from these areas will be silt fence. Tire scrubber/construction accesses will be
provided for the access to EROSION CONTROL NOTES: 1.
All
work shall be conducted in a manner to preserve all existing vegetation that
is not required to be removed. 2.
Work
shall be scheduled and executed in a manner so that ground cover is removed
and earthwork is exposed to erosion for the minimum time practical. 3.
All
off-site and on-site erosion and sediment damage shall be the responsibility
of the contractor and shall be corrected immediately. 4.
All
erosion control work shall be done in accordance with the Erosion and
Pollution Control Program Manual by Pennsylvania Depart of Environmental
Protection (PADEP), 5.
A
copy of the approved erosion and sediment control plan must be available at
the project site at all times. The
operator shall assure that an erosion and sediment control plan has been
prepared, approved by the Chester County Conservation District, and is being
implemented and maintained for all soil and/or rock spoil and borrow areas,
regardless of their locations 6. Before initiating any revision to the
approved erosion and sediment control plan or revisions to other plans which
may affect the effectiveness of the approved E&S control plan, the
operator must receive approval of the revisions from the Chester County Conservation
District. The operator shall assure
that the approved erosion and sediment control plan is properly and
completely implemented. Immediately
upon discovering unforeseen circumstances posing the potential for
accelerated erosion and/or sediment pollution, the operator shall implement
appropriate best management practices to eliminate potential for accelerated
erosion and/or sediment pollution. 7.
Until the site is stabilized all
erosion and sedimentation BMP's must be maintained
properly. Maintenance must include inspections of all erosion and
sedimentation BMP's after each runoff event and on
a weekly
basis. All site inspections will be documented in an inspection log kept for
this purpose. The compliance actions
and the date, time and name of the person conducting the inspection. The inspection log will be kept on site at
all times and made available to the District upon request. All preventive and remedial maintenance work, including clean out, repair, replacement, regrading, reseeding, remulching and renetting, must be performed immediately. If erosion and sedimentation BMP's fail to perform as expected, replacement BMP's or modifications of those installed will be needed. Where BMP's are found to fail to alleviate erosion or sediment pollution the permittee or co-permittee shall include the following information: a.
The location and severity of the BMP's
failure and any pollution events.
b.
All steps
taken to, reduce, eliminate and prevent the recurrence of the non-compliance.
c.
The time frame to correct the non-compliance,
including the exact dates when the activity will return to compliance.
8.
Upon
completion or temporary cessation of the earth disturbance activity,
earthwork shall be stabilized with unrotted small
grain straw or salt hay at a rate of 3 tons per acre. The mulch shall be
anchored with emulsified or cutback asphalt binder, if conditions warrant. On
steep slopes, netting shall be used to anchor mulch in place. Slope
steepness, slope length, soil erodiblity and cut of
fill conditions shall be considered in determining the need for netting or
other mulch tacking methods. 9.
All
topsoil and earth stockpiles shall be placed in designated areas as shown on
the plan and they shall be graded to minimize erosion. No topsoil, earth or other erodible material shall be placed within 25 feet of any
inlet or drainage ditch, at any time.
Upon completion or temporary cessation of the earth disturbance
activity, windward slopes of stockpiles shall be graded to a 2:1 slope and
shall be stabilized as outlined in Note #8 above. After construction is complete, any
remaining stockpile material shall be graded onto the site and stabilized or
hauled off site. 10. If
cut/fill doesn’t balance, then the cut/fill shall be stockpiled/excavated
in the locations designated on the plan. 11. Crushed stone construction entrances
shall be maintained in place until removal is necessary for final grading of
the driveway subgrade. A stockpile of rock material
will be maintained on the site to maintain the thickness of the construction entrance
as shown on the plans. At the end of
each construction day, all sediment deposited on public roadways will be
removed and returned to the construction site. 12. Clearing
and grubbing is to be limited to the areas that must be disturbed to
accommodate proposed facilities. 13. When conditions warrant, the Contractor
shall control excessive dust generated by construction activities on the
site. 14. Site conditions may dictate that during
construction, additional silt fence and/or other methods of sediment control
may be required. 15. Silt fence sediment barriers shown on
the plan should be repaired, cleaned or replaced if necessary. 16. All
slopes steeper than 3:1 must be stabilized with erosion control blanket. 17. All pumping of sediment laden water
shall be through a sediment control BMP, such as a pumped water filter bag
discharging over non-disturbed areas. 18. All excavation for utility line
installation shall be limited to the amount that can be excavated, installed,
backfilled, and stabilized within one working day. All excavated material shall be deposited
on the upslope side of the trench. 19. An
Area shall be considered to have achieved final stabilization when it has a
minimum uniform 70% perennial vegetative cover or other permanent
non-vegetative cover with a density sufficient to resist accelerated surface
erosion and subsurface characteristics sufficient to resist sliding and other
movements. Immediately after earth
disturbance activities cease, the operator shall stabilize and areas
disturbed by the activities. During
non-germinating periods, mulch must be applied at the specified rates. Disturbed areas which are not at finished
grade and which will be redisturbed within 1 year
must be stabilized in accordance with the temporary vegetative stabilization
specifications. Disturbed areas which
are at finished grade or which will not be redisturbed
within 1 year must be stabilized in accordance with the permanent vegetative
stabilization specifications. 20. The Contractor shall maintain all areas
where erosion is apparent for one year from the date of completion. Construction Sequence: All earth disturbance activities
shall proceed in accordance with the following sequence. Each stage shall be completed before any
following stage is initiated. Clearing
and grubbing shall be limited only to those areas described in each stage. 1.
At least 7 days before starting any earth disturbance
activities, the operator shall invite all contractors involved in those
activities, the landowner, all appropriate Township officials, the erosion
and sedimentation control plan preparer, and a representative of the Chester
County Conservation District to an on-site pre-construction meeting. In addition, at least 3 days before
starting any earth disturbance activities, all contractors involved shall
notify the Pennsylvania One Call System Inc. at 1-800-242-1776 for buried
utilities location. 2. The following construction sequence should be
followed for each lot: a. Install Rock Construction Entrance at the
access to b. Delineate all “Limits of Disturbance” with
visible flagging or ribbon. c. Install all filter fabric fence as shown on the
E & S Control Plan. d.
Remove the
existing building ruins and dispose of off site in an approved location. e. The
operator shall remove from the site, recycle, or dispose of all building
material and wastes in accordance with the Department's Solid Waste
Management Regulations at 25 Pa. Code 260.1 et seq., 271.1
et seq., and 287.1 et seq. The contractor shall not bury, dump, or
discharge any building material wastes at the site. f.
Install
the driveway and stabilize with stone and/or pavement. g. Stake out building pad, strip and stockpile
topsoil, and rough grade. Topsoil
stockpiles will be encircled with 18” silt fence and stabilized immediately
with straw mulch. h. Building construction to commence after the placement
of Silt Fence and Rock Construction Entrance (see Building Construction
sequence). i.
As
construction progresses, maintain sheet flow of surface runoff toward the
installed silt fence. j.
Once the
house is nearing completion on each lot, install the rain garden. 3. If the construction on 4. Fine grade the remainder of the lot, seed and
mulch. 5. Prior to the removal of any E&S control
facility or the conversion of temporary E&S controls to permanent SW
controls the CCCD and the Township must inspect the facility and approve the
removal or conversion. Building Construction: 1. To all areas around the building site, upon
completion or temporary cessation of the earth disturbance activity, apply
mulch (wood chips - 20 tons per acre; hay or straw - 3 tons per acre). 2. Strip topsoil and stockpile in an area
designated on the plan. Encircle the
topsoil stockpile with 18” silt fence. 3. Construct building. 4. Install the utilities (i.e., electric, well and septic). 5. Backfill and stabilize the areas surrounding
the building. 6. Final grade lot area around building, respread topsoil, seed and mulch with permanent seeding
specifications. 7. When the area tributary to the onsite silt
fence is determined to be uniformly stabilized (70% vegetative cover) based
on a site inspection by the CCCD and the Township, remove the silt fence,
seed and mulch area disturbed by removal of E&S facilities. MAINTENANCE PROGRAM: The following maintenance
procedures shall apply: 1. All erosion and sedimentation control devices
shall be checked every week and after every storm event. 2. Should unforeseen erosive conditions develop
during construction, the contractor shall take immediate action within 24
hours to remedy such conditions and to prevent damage to adjacent properties
by an increase in run-off and/or sediment displacement. 3. Stockpiles of wood chips, hay/straw bales,
crushed stone and other mulches and materials shall be held in readiness to
deal immediately with emergency problems and conditions. 4. All topsoil storage areas shall be placed in an
area not subject to concentrated run-off. The down slope side shall be protected by
temporary silt fence and seeding. 5. Seeded areas that have washed away shall be
filled and graded as necessary, reseeded and mulched. 6. Sediment must be removed from the silt fence
sediment barriers where accumulations reach one half of the above ground
height of the fence. Sediment cleaned
from the silt control fence shall be graded on site and stabilized. Any silt fence that has been undermined or
over topped shall be replaced with stone filter outlets immediately. 7. Sediment must be removed from the stone filter
outlets if necessary in order to function properly. 8. Trash removed from the control devices shall be
disposed of in any approved disposal area. 9. Any seeded or sodded
areas that have become stripped of vegetation shall be re-established with
appropriate stabilization materials.
This procedure shall be repeated after every sizable storm until no
more signs of erosion are evident. 10. The crushed stone construction entrance shall
be maintained in place until removal is necessary for final grading of the
driveway subgrade.
A stockpile of rock material shall be kept on the site to maintain the
thickness of the construction entrance as shown on the plans. At the end of each construction day, all sediment
deposited on public roadways will be removed and returned to the construction
site. 11. At the end of each working day, any and all
sediment tracked onto, or conveyed by other means, onto a public roadway,
will be removed and redeposited onto the
construction site. Removal can be
completed through use of either machinery or by hand tools, but under no
circumstances shall be washed off the road by use of water. 12. Sediment shall be cleaned out of the sediment
traps when the sediment has accumulated to the cleanout elevations indicated
on the plans. Sediment removed from
the basin or trap shall be placed in a designated stockpile area or graded on
the site and stabilized. 13. The swales should be mowed regularly. 1. Only limited disturbance will be permitted to
provide access to sediment traps and diversion swales for grading and
acquiring borrow to construct those controls. 2. Erosion and sedimentation controls must be
constructed, stabilized and functional before site disturbance within the
tributary areas of those controls. 3. Filter fabric (silt) fence must be installed at
level grade. Both ends of each fence
section must extend at least 10 feet up slope at 45 degrees to the main fence
alignment. 4. Sediment must be removed when accumulations
reach 1/2 the height of the silt fence. 5. Any fence section that has been undermined or
topped must be immediately replaced with a rock filter outlet. 6. Topsoil stockpile heights must not exceed 35
feet. Stockpile slopes must be 2:1 or
flatter. 7. Any disturbed area, upon completion or
temporary cessation of the earth disturbance activity, must be stabilized
immediately. During non-germinating
periods, mulch must be applied at the recommended rates. Disturbed areas that are not at finished
grade and will be redistributed within 1 year may be stabilized in accordance
with temporary seeding specifications.
Disturbed areas that are either at finished grade or will not be
redistributed within 1 year must be stabilized in accordance with permanent seeding
specifications. 8. Diversions, channels, sedimentation
basins/traps and stockpiles must be stabilized immediately. 9. Until the site is stabilized, all erosion and
sedimentation must be maintained properly. Maintenance must include
inspections of all erosion and sedimentation controls after each runoff event
and on a weekly basis. All preventive
and remedial maintenance work, including clean out, repair, replacement, regrading, reseeding, remulching
and renetting must be performed immediately. 10. After final site stabilization is achieved,
temporary erosion and sedimentation controls must be removed. Areas disturbed during removal of the
controls must be stabilized immediately. GENERAL NOTES: 1.
Completeness
and accuracy of location and depth of underground utilities or structures
cannot be guaranteed. Location and
depth of all underground utilities and facilities must be verified prior to
any earth moving activities as per Act 187 of 1996. 2.
Topography
shown according to a field survey by Crossan-Raimato;
3.
Soil
types are shown according to Sheet No. 71 of the Soils Survey for 4.
All
lots to be serviced by on-lot water and sewage disposal systems. 5.
There
are no “special flood hazard areas subject to inundation by the 1% chance
flood” on this property, according to Panel 285 of the Flood Insurance Rate
Map for 6.
This
property was inspected for the presence of freshwater wetlands. No wetlands were found. 7.
Nothing
shall be placed, planted, set, or put within the area of an easement that
would adversely affect the function of the easement. 8.
The
developer shall be responsible for the proper construction, stabilization,
and maintenance of all erosion and sedimentation controls and related items
included within this plan. 9.
Erosion
and sediment controls must be constructed, stabilized, and functional before
general site disturbance with the tributary areas of those controls. 10. All runoff from this parcel must be
treated until the parcel is uniformly stabilized (70% vegetative cover). 11. Should any measures contained within
this plan prove incapable of adequately removing sediment from on-site flows
prior to discharge or prior to surface stabilization, additional measures
must be immediately implemented by the property owner to eliminate all such
problems. 12. All construction operations shall be
carried out in a manner such that soil erosion and air/water pollution is
minimized. State and local laws
concerning pollution abatement shall be followed. 13. Should unforeseen erosive conditions
develop during construction, the contractor shall take action to remedy such
conditions and to prevent damage to adjacent properties as a result of
increased runoff and/or sediment displacement. Special attention should be given to frozen
slopes. Stockpiles of wood chips,
crushed stone and other mulches shall be in readiness to deal immediately
with the emergency erosion problem. 14. The contractor shall be thoroughly
familiar with the provisions of Appendix 64 "Erosion Control Rules and
Regulations", Title 25, Part I, Subpart C,
"Protection of Natural resources", and Article II "Water
Resources", Chapter 102 Erosion Control.
All are published by the Pennsylvania Department of Environmental
Protection. 15. Stream/watershed
classification): Unnamed Tributary to West Branch, White Clay Creek/TSF-MF. 16. Disturbed Area: 1.8 Acres 17. The project is anticipated to begin
excavation immediately following the receipt of final plan approval. 18. All roof drains shall discharge toward
infiltration systems, with appropriate measures to prevent vegetative
clogging. TEMPORARY SEEDING
SPECIFICATIONS: Where it is not possible to
permanently stabilize a disturbed area upon completion or temporary cessation
of the earth disturbance activity, temporary seeding shall be done using the
following seeding specifications: Seed Type % by Wt. Seeding
Rate Seeding Dates Annual 100% 1 lb./1000 sf` March
1 to June 15 Ryegrass 20-40 lb./Ac. August
15 to September 15 Spring 100% 1
lb./100 sf March
1 to June 15 Oats 96 lb./Ac. Winter Annual Spring Oats 75% 85
lb./Ac. SITE PREPARATION: Apply 1 ton
agricultural grade limestone per acre plus PERMANENT SWALE SEEDING
SPECIFICATIONS: MATERIALS: Limestone - Raw, ground
agricultural limestone containing more than 90% carbonates. Commercial Fertilizer - use 500
pounds 8-16-16 or 800 pounds 5-10-10 to the acre mixed into the seedbed prior
to seeding, or mixed in with the seed if hydroseeding. Mulch - Clean oat or wheat straw
shall be free from mature seed-bearing stalks or roots of prohibited or
noxious weeds as defined by the Pennsylvania Seed Act of 1947. Apply at a rate of 3.0 tons per acre. The mulch should be stabilized until the
vegetative cover is established. Seed Type %
by Wt. Seeding Rate Seeding
Dates KY 31 Fall 38% 1-2
lb./1000 sf
March 1 to May 20 Fescue July 25
to September 15 Creeping 50% 40
lb./Ac. March
1 to June 15 Red Fescue Redtop 12% Ky 31 fall 1-2 lb./1000 sf March
1 to May 30 Fescue
July
25 to September 15 or Creeping Red 25% Fescue or Ryegrass 75% Crownvetch 25% Ky Creeping Red 55% Fescue Perennial (lawn mix) Chewing 40% 2
lb./1000 sf Fescue Creeping Red 30% 40
lb./Ac. Fescue Ky Perennial (meadow mix) Annual Ryegrass 100% 6
lb./1000 sf All disturbed areas requiring
final stabilization must be addressed upon completion or temporary cessation
of the earth disturbance activity. Recommended seeding dates: March
15 - June 15 and/or August 15 - October 15.
Areas to be stabilized must be seeded/planted in sufficient time to
germinate by October 15 of each year.
After seeding is complete, mulch with unrotted
small grain straw or salt hay at 3 tons per acre. Permanent seeding shall only occur
during the dates listed above. If
areas are prepared for seeding at other times, then the prepared seedbed
shall be heavily mulched with clean unrotted small
grain straw or salt hay at a rate of 3 tons per acre. The mulch shall remain in place until
seeding dates are appropriate. The
mulch shall be removed; the area shall be dressed, seeded and remulched as described above. |
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