[Ord. No. 05-422 §1, 8-8-2005]
A. Design. The design of erosion and settlement controls required
for land disturbance activities shall comply with the following minimum
requirements:
1. Land
disturbance, erosion and sediment control practices and watercourse
crossings shall be adequate to prevent transportation of sediment
from the site.
2. Materials
brought to any site or property under a permit issued under this code,
where said material is intended to be utilized as fill material at
the site for land disturbance, erosion or sediment control, shall
consist of clean uncontaminated earth, soil, dirt, sand, rocks, gravel
or masonry materials only.
3. Cut
and fill slopes shall be no greater than 3:1 except as approved by
the Department of Public Works or the Department of Highways and Traffic
to meet other community or environmental objectives.
4. Clearing
and grading of natural resources, such as forests and wetlands, shall
not be permitted, except when in compliance with all other County
ordinances.
5. Clearing
techniques that retain existing vegetation to the maximum extent practicable
shall be used and the time period for disturbed areas to be without
vegetative cover shall be minimized to the extent practical.
6. Clearing,
except that necessary to establish sediment control devices, shall
not begin until all sediment control devices have been installed and
have been stabilized.
7. Phasing
shall be required on all sites disturbing greater than thirty (30)
acres of land. The size of each phase will be established by the Department
of Planning at the time of plan review for the issuance of a major
land disturbance permit.
B. Erosion Control Design. Erosion control requirements shall
include the following:
1. Soil
stabilization shall be completed within five (5) days of clearing
or inactivity in construction.
2. If seeding
or another vegetative erosion control method is used, it shall become
established within two (2) weeks or the site shall be reseeded or
a non-vegetative option employed.
3. Techniques
shall be employed to ensure stabilization on steep slopes and in drainage
ways.
4. Soil
stockpiles must be stabilized or covered at the end of each workday
or perimeter controls must be in place to prevent silt from the stockpile
from leaving the site.
5. The
entire site must be stabilized, using a heavy mulch layer or another
method that does not require germination to control erosion, at the
close of the construction season.
6. Techniques
shall be employed to prevent the blowing of dust or sediment from
the site.
7. Techniques
shall be employed to divert upland runoff past disturbed slopes.
C. Sediment Control Design. Sediment control requirements shall
include:
1. Settling
basins, sediment traps or tanks and perimeter controls.
2. Settling
basins shall be provided for each drainage area within ten (10) or
more acres disturbed at one time and shall be sized to contain one-half
(0.5) inch of sediment from the drainage area and be able to contain
a 2-year, 24-hour storm. If the provision of a basin of this size
is impractical, other similarly effective best management practices
(BMP), as evaluated and specified in the stormwater pollution prevention
plan (SWPPP), shall be provided.
3. Settling
basins shall be designed in a manner that allows adaptation to provide
long-term stormwater management, as required by the County department(s)
having enforcement authority and responsibilities described in Section
103.0 of the SLCRO.
4. Settling
basins shall have stabilized spillways to minimize the potential for
erosion of the spillway or basin embankment.
5. Protection
for adjacent properties by the use of a vegetated buffer strip in
combination with perimeter controls.
D. Watercourse Design. Watercourse protection requirements
shall include:
1. Encroachment
into or crossings of active watercourses/riparian areas and wetlands
shall be avoided to the maximum extent practicable. All Village, County,
State and Federal permits and approvals shall be obtained by a permit
holder prior to beginning work authorized by a Village land disturbance
permit.
2. Stabilization
of any watercourse channels before, during and after any in-channel
work.
3. If a
defined watercourse is to be realigned or reconfigured, clearing and
grubbing activities within fifty (50) feet of the watercourse shall
not begin until all materials and equipment necessary to protect the
watercourse and complete the work are on site. Once started, work
shall be completed as soon as possible. Areas within fifty (50) feet
of the watercourse shall be recontoured and revegetated, seeded or
otherwise protected within five (5) working days after land disturbance
activities have ceased.
4. All
stormwater conveyances shall be designed according to the criteria
of the St. Louis Metropolitan Sewer District (MSD) and the necessary
MSD permits obtained.
5. Stabilization
adequate to prevent erosion shall be provided at the outlets of all
pipes and paved channels.
E. Construction Site Access Design. Construction site access
requirements for major land disturbance activities shall include:
1. A temporary
access road provided at all land disturbance sites including a wash
down area supporting all active sites.
2. The
Department of Highways and Traffic may require other measures to ensure
that construction vehicles do not track sediment onto public streets
or be washed with wash effluent channeled directly into storm drains.
F. Control Of Construction Materials And Waste. Control requirements for construction materials, construction wastes and other wastes generated on site at land disturbance sites shall include provisions, satisfactory to the County department(s) having enforcement authority and responsibilities described in Section
411.050 of this Code, for:
1. Spill
prevention and control facilities for materials such as paint, solvents,
petroleum products, chemicals, toxic or hazardous substances, substances
regulated under the Resource Conservation and Recovery Act (RCRA)
or the Comprehensive Environmental Response, Compensation and Liability
Act (CERCLA) and any wastes generated from the use of such materials
and substances, including their containers. Any containment systems
employed to meet this requirement shall be constructed of materials
compatible with the substances contained and shall be adequate to
protect both surface and ground water.
2. Collection and disposal of discarded building materials and other construction site wastes, including those listed in subsection
(F)(1) above.
4. Control
of concrete truck washouts.
5. Assurance
that on-site fueling facilities will adhere to applicable Federal
and State regulations concerning storage and dispensers.
6. Provision
of sufficient temporary toilet facilities to serve the number of workers
on major land disturbance sites.