Wisconsin Administrative Code
Department of Natural Resources
NR 500-599 - Environmental Protection - Solid Waste Management
Chapter NR 504 - Landfill Location, Performance, Design And Construction Criteria
Section NR 504.09 - Storm water management and miscellaneous design and construction criteria for landfills
Universal Citation: WI Admin Code ยง NR 504.09
Current through August 26, 2024
(1) STORM WATER MANAGEMENT.
(a) Storm water drainage ditches, structures
and sedimentation basins shall be designed such that the construction of these
items shall occur during the initial stage of construction to control rainfall
runoff and limit entrained sediment from reaching surface water
bodies.
(b) All landfills shall
incorporate the following concepts in the design of both temporary and
permanent erosion and sediment control measures:
1. Grading and construction shall be
scheduled to minimize soil exposure.
2. Existing vegetation shall be retained
whenever feasible.
3. Disturbed
areas shall be vegetated and mulched.
4. Runoff shall be diverted away from
disturbed areas and active fill areas.
5. Runoff velocities shall be
minimized.
6. Drainageways and
outlets shall be prepared to handle concentrated or increased runoff.
7. Sediment shall be trapped on
site.
8. Runoff control structures
shall be inspected and maintained.
(c) The design calculations required in pars.
(d), (e) and (f) shall each be performed for the period in the landfill's
development where the combination of surface conditions and contributing
acreage would result in the greatest runoff volume.
(d) All temporary and permanent storm water
drainage ditches, swales, conveyance channels, channel linings, outlet
protection, culverts and other storm water control structures handling flow
onto or off the landfill shall be designed to accommodate peak flow rates from
a 25 year, time of concentration storm event.
(e) Temporary and permanent sediment control
measures shall be designed to settle 0.015 mm size particles for all storms up
to and including the 25 year, 6-hour storm. The surface area for sediment
basins shall be calculated using the rainfall intensity over the 25 year,
6-hour storm event for the landfill. Principal spillways, and outlet protection
for sediment basins shall be designed to pass a 25 year, time of concentration
storm event. Emergency spillways for sedimentation basins shall be designed to
pass a 100 year, time of concentration storm event. The design of the
dewatering structures for sediment basins shall be selected such that the basin
is dewatered in no less than 3 days. An analysis shall be performed to document
compliance with this requirement.
(f) Storm water shall be diverted away from
the active fill area of the landfill and any borrow areas to a sedimentation
control structure.
(g) Containment
berms placed around active fill areas shall be designed to control and collect
the liquid volume resulting from the 25 year, 24-hour storm event. The design
shall consider the volume of liquid generated from active fill areas which
shall include areas with exposed solid waste or areas with waste covered by
daily cover. Storm water in contact with active fill areas shall be handled and
treated as leachate in accordance with ch. NR 506.
(h) Storm water drainage ditches, structures
and sedimentation basins shall discharge along existing drainage patterns
capable of accepting the anticipated flow volume. An analysis shall be
performed to determine the amount and velocity of runoff prior to landfill
development and to document compliance with this requirement.
(i) Storm water diversion and construction at
a landfill shall be designed to minimize impacts on adjacent property, such as
erosion, sedimentation and flooding.
(j) Design of all storm water management
features shall comply with other applicable requirements of the department.
Such requirements include, but are not limited to, ch. NR 103, and permits
required by ch. 30, Stats.
(2) MISCELLANEOUS. All landfills shall be designed to meet the following requirements:
(a) A method of controlling any dust or
windblown debris shall be included in the landfill design. The factors which
will be considered by the department when evaluating alternative provisions for
controlling dust and windblown debris includes the remoteness of the landfill,
natural screening, windbreaks and waste types.
(b) Access to the landfill shall be
restricted through the use of fencing, natural barriers or other methods
approved in writing by the department.
(c) All access roads for the landfill,
including those leading to the active area, shall be designed for all weather
operation.
(d) All access roads
which are used by over the highway vehicles shall be designed with a maximum
grade no greater than 10%. The intersection of the landfill access road with an
existing highway shall be designed to provide sufficient sight distance and
minimum interference with traffic on the highway.
(f) A minimum separation distance of 100 feet
shall be maintained between the limits of filling and adjacent property line. A
minimum distance of 50 feet shall be maintained between any permanent berms or
excavations associated with the landfill, excluding storm water diversion
structures and the adjacent property line.
(g) The landfill shall be designed so that
final grades in each phase are reached as soon as possible, and the open area
used for refuse filling is minimized.
(h) The final slopes of all landfills shall
be equal to or greater than 5%, but may not exceed 4 horizontal to one
vertical. Landfills primarily designed for the acceptance of papermill or
wastewater treatment plant sludge shall have final slopes no greater than 6
horizontal to one vertical.
(i) A
minimum of 2 leachate head wells shall be proposed for each major horizontal
phase of the landfill unless otherwise approved by the department.
(j) All landfills which accept municipal
solid waste shall be supplied with a weight scale.
(k) All landfills shall be designed with
properly protected permanent benchmarks for horizontal and vertical control.
Elevations shall be tied to USGS datum and horizontal control shall be
referenced to the property boundary.
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