Current through August 26, 2024
A secondary containment structure shall take one of the
forms authorized in this section.
(1)
CONCRETE STRUCTURES.
(a) A secondary
containment structure may be constructed of concrete.
(b) A concrete secondary containment
structure constructed on or after November 1, 2006 shall be constructed of
portland cement concrete and shall comply with standards specified in chapters
5 and 6 of the
Wisconsin Minimum Design and Construction Standards for
Concrete Mixing and Loading Pads and Secondary Containment Structures
(February 2005).
Note: The Wisconsin Minimum Design and
Construction Standards for Concrete Mixing and Loading Pads and Secondary
Containment Structures (February 2005), written by professor David W.
Kammel, department of biological systems engineering, University of
Wisconsin-Extension, is on file with the department and the legislative
reference bureau. Copies are available free of charge from the department at
the following address:
Department of Agriculture, Trade and Consumer
Protection
Agricultural Resource Management Division
P.O. Box 8911
Madison, WI 53708-8911
Phone: (608) 224-4500
Web: https://datcp.wi.gov/Pages/Homepage.aspx
(c) If a concrete secondary containment
structure is constructed on or after November 1, 2006, the operator or a person
chosen by the operator shall inspect the construction for conformity to the
design specifications filed with the department under s.
ATCP 33.10(1). The person conducting the
inspection shall inspect and approve the construction of the soil sub-base, the
laying of structural steel, and the laying of waterstop materials and devices
before concrete is poured. The operator shall provide a copy of the inspection
report and approval to the department.
Note: The department recommends that
construction inspection be performed by a qualified person experienced in
reading plans and inspection construction.
(3) Structures with synthetic liners. A
secondary containment structure may be constructed of earth or other materials
if the structure is fully lined with a synthetic liner and all of the following
apply:
(a) The operator installs the liner and
tests liner seams according to manufacturer specifications. A qualified
representative of the liner manufacturer shall perform or supervise the
installation and testing.
(b) The
liner is at least 30 mils (0.8 millimeter) thick.
(c) The manufacturer certifies in writing
that the liner is chemically compatible with all fertilizers or pesticides that
the operator may store within the secondary containment structure. The operator
may not store, within the liner, any fertilizer, pesticide or chemical for
which the liner is not certified.
(d) The liner manufacturer guarantees liner
effectiveness until a date specified by the manufacturer. The operator may not
use the liner beyond that date unless the operator conducts an inspection of
the liner within the first year after that date, and at least once every 5
years thereafter. Each inspection shall comply with all of the following
requirements:
1. The operator shall remove all
gravel and geotextile from those portions of the liner that are not covered by
storage containers, and shall inspect those portions of the liner.
2. The operator shall remove a storage
container, and inspect those portions of the liner that were covered by the
storage container, if an inspection under subd. 1. discloses a problem that
extends under the storage container.
3. A department inspector shall attend the
inspection.
(e) The
operator repairs and maintains the liner and seams, as necessary, to ensure
that the liner complies with this subsection and remains effective. The
operator shall perform repairs according to manufacturer specifications. A
qualified representative of the liner manufacturer shall perform or personally
supervise each repair.
(f) The
liner rests on one of the following bases, installed according to good
engineering practice to provide stable support for the liner:
1. A synthetic geotextile.
2. A layer of soil, sand or smooth gravel at
least 6 inches (15.24 centimeters) thick. The layer shall consist of particles
less than 1/2 inch in diameter, and shall be free of sharp objects that
may penetrate the liner.
(g) The liner is separated, by both of the
following, from every storage container whose weight bears on the liner:
1. A synthetic geotextile that rests on the
liner.
2. A layer of soil, sand or
smooth gravel at least 3 inches (7.62 centimeters) thick that rests on the
synthetic geotextile. If the soil, sand or gravel is held in place by a steel,
synthetic or other structure, the geotextile liner under subd. 1. shall extend
beneath that structure.
(h) The liner is protected, as necessary,
against damage from human and motor vehicle traffic.
(i) The liner is protected against damage
from sunlight and other sources, as necessary, according to manufacturer
recommendations.
(4)
PREFABRICATED STRUCTURES. A secondary containment structure may consist of one
or more basins pre-fabricated of steel or rigid synthetic material if all of
the following apply:
(a) The steel or
synthetic material resists corrosion, puncture and cracking. Prefabricated
steel structures shall be at least 1/8 inch thick at every point.
(b) The steel or synthetic material is
chemically compatible with all fertilizers or pesticides that may be stored
within the basin. The basin manufacturer shall certify chemical compatibility
in writing, and the operator shall submit a copy of the certification to the
department.
(c) If 2 or more basins
are connected to form the secondary containment structure, the connection
permits free movement of any discharged liquid between the basins.
(5) STEEL STRUCTURES CONSTRUCTED
IN PLACE. A secondary containment structure may be constructed of steel, if it
is constructed in place. A steel secondary containment structure constructed on
or after November 1, 2006 shall be at least 1/8 inch thick at every
point.
(6) STRUCTURES WITH EARTHEN
LINERS.
(a) A secondary containment structure
may be constructed of earth or other materials if one of the following applies
and the structure has an earthen liner that complies with par. (b):
1. The structure was in use prior to November
1, 2006.
2. The structure contains
only fertilizer storage containers that were constructed on site.
(b) An earthen liner under par.
(a) shall comply with all of the following:
1. The liner shall be designed and
constructed, according to good engineering practice, to achieve a coefficient
of permeability of not more than 1 x 10 -6 cm/sec.
2. The liner shall be at least 6 inches (15
centimeters) thick.
3. The liner
shall be covered by an inorganic soil layer not less than 6 inches (15
centimeters) thick.
4. The liner
shall be maintained to prevent cracking.
5. The liner may not be constructed of silt,
silty sand or other frost-susceptible soils.
6. If the liner is made of natural soil, not
less than 50% by weight of the natural soil shall pass through a number 200
soil sieve and not less than 95% by weight of the natural soil shall pass
through a number 4 sieve. A natural soil liner shall contain not more than 2%
organic material and shall have a plasticity index of at least 15.
7. The liner, if treated with bentonite,
shall have a uniform mixture of natural soil and bentonite. The natural soil
shall have a plasticity index of at least 12. Not less than 30% by weight of
the natural soil shall pass through a number 200 soil sieve, and not less than
95% by weight of the natural soil shall pass through a number 4 soil sieve. Not
less than 90% by weight of the bentonite shall pass through a number 80 soil
sieve, and the soil-bentonite mixture shall contain at least 5% bentonite by
weight.
8. The liner shall be
reconstructed at least once every 15 years.
9. The operator shall remove storage
containers from the secondary containment structure before reconstructing or
recompacting the liner, except that the operator is not required to remove a
storage container that has a capacity of 50,000 gallons or more.
10. Before the operator reconstructs or
recompacts the liner, the operator shall analyze the liner material for
compliance with subds. 6. and 7., and to determine whether corrective action is
required under ch. ATCP 35.
(7) BUILDING FLOOR; MINI-BULK AND MOBILE
CONTAINERS. A warehouse or other building may be used as a secondary
containment structure for all of the following if the building complies with
this section and can contain a discharge of liquid fertilizer or pesticide:
(a) Mini-bulk containers of fertilizer or
pesticide.
(b) Mobile containers
kept in the building for not more than 7 days.
(8) MIXING AND LOADING PADS USED FOR
SECONDARY CONTAINMENT. An operator may use a mixing and loading pad as a
secondary containment structure if the mixing and loading pad complies with s.
ATCP 33.32 and this section.
(9) TANK-IN-TANK. An operator may use a
tank-in-tank, without any other secondary containment structure, if all of the
following apply:
(a) A liquid level
monitoring device automatically stops the flow of fertilizer or pesticide into
the inner tank when the inner tank is filled to the maximum level allowed under
s.
ATCP 33.20(9).
(b) The tank-in-tank is equipped to ensure
safe and effective detection and recovery of liquid leaked from the inner tank
to the outer tank.
(c) The operator
inspects the tank-in-tank and leak detection system at least monthly.
(d) The operator does all of the following in
response to a leak:
1. Promptly reports the
leak to the department.
2. Empties
the tank-in-tank no later than a date specified by the department in
writing.
3. Thoroughly cleans the
tank-in-tank, and has it repaired by a person certified to perform repairs
under API 653, before restoring the tank-in-tank to service.
(10) BLADDER TANK. An
operator may use a bladder tank, without any other secondary containment
structure, if all of the following apply:
(a)
The outer steel part of the bladder tank complies with s.
ATCP 33.20.
(b)
The bladder within the tank is at least 40 mils thick.
(c) The manufacturer certifies that the
bladder is chemically compatible with all materials that may be stored in it,
and will withstand normal operational stresses without failing.
(d) A qualified installer installs the
bladder tank and its appurtenances.
(e) All appurtenances that extend through
both the bladder and the tank have shut-off valves. The shut-off valves shall
be enclosed within a structural steel box that can withstand the maximum
hydrostatic head pressure of liquid within the bladder tank. The box shall be
readily accessible to the operator, but secured against unauthorized
access.
(f) A liquid level
monitoring device automatically stops the flow of fertilizer or pesticide into
the bladder when the bladder is filled to the maximum level allowed under s.
ATCP 33.20(9).
(g) There is room for a person to enter the
space between the bladder and tank when the bladder is empty.
(h) The tank has a soft liner to protect the
bladder from contact with the steel interior surface of the tank.
(i) The tank is equipped to ensure safe and
effective detection and recovery of liquid leaked from the bladder to the
tank.
(j) The operator inspects the
tank and leak detection system at least monthly.
(k) The operator does all of the following in
response to a leak:
1. Promptly reports the
leak to the department.
2. Empties
the bladder and tank no later than a date specified by the department in
writing.
3. Has the bladder
repaired by a qualified person before restoring the bladder tank to
service.
4. Cleans affected
portions of the bladder, soft liner and interior tank surface before restoring
the bladder tank to service.
