Mich. Admin. Code R. 285.640.8 - Secondary containment of bulk liquid pesticides
Rule 8.
(1) Primary
storage containers of bulk pesticide shall be located within a diked
containment area that is constructed with a base, perimeter wall, sloped floor,
and watertight catch basin or sump. A containment area shall not have a relief
outlet or discharge valve unless the requirements of subrule (8)(d) of this
rule are met.
(2) Minibulk
pesticide containers that are in compliance with DOT-57 or MACA-75
specifications are exempt from secondary containment requirements. These
minibulk containers shall be placed upon a paved impermeable surface.
(3) A container which is used solely for the
premixing of use solutions, which has a maximum volume of 2,500 gallons, and
which is in compliance with all of the following requirements shall be exempt
from secondary containment requirements:
(a)
The container shall be attended by facility personnel at all times when being
used for mixing.
(b) The contents
of the container shall be completely removed at least once every 24
hours.
(c) The container shall be
placed upon a paved impermeable surface.
(d) The container shall be in compliance with
the requirements specified in R 285.640.4.
(4) Capacity requirements for secondary
containment areas are as follows:
(a) The
diked area for containment at a bulk storage facility that is not protected
from rainfall shall contain a minimum of 110% of the volume of the largest
storage container within the diked area, plus the volume that is occupied by
all other tanks within and below the height of the dike, plus the volume of a
6-inch rainfall.
(b) The diked area
for containment at a bulk storage facility that is protected from rainfall
shall contain a minimum of 110% of the volume of the largest storage container
within the diked area, plus the volume that is occupied by all other tanks
within and below the height of the dike.
(c) Secondary containment areas which were
constructed before the effective date of this rule and which have a minimum
capacity of 110% of the volume of the largest storage container within the
diked area, plus the volume that is occupied by all other tanks within and
below the height of the dike, shall be deemed to be in compliance with this
rule. Any such storage facility shall, upon alteration of the secondary
containment area or increases in storage container volume, be brought into full
compliance within 1 year of the alteration or increase.
(d) Secondary containment that is not located
within a roofed building shall provide for separation between bulk pesticides
and bulk fertilizers to the extent that a common wall or curb between the
pesticide and fertilizer areas will accomplish either of the following:
(i) Prevent pesticide from entering the
fertilizer area, but allow fertilizer to enter and utilize the pesticide area
while maintaining the capacity requirements specified in subdivisions (a) to
(c) of this subrule.
(ii) Maintain
a complete separation of fertilizer and pesticide, with or without a common
wall, if each separate area maintains the capacity requirements specified in
subdivisions (a) to (c) of this subrule.
(5) Wall requirements for secondary
containment areas are as follows:
(a) The
walls of a secondary containment area shall be constructed of any of the
following materials and shall be designed to withstand a full hydrostatic head
of any discharged liquid and weight load of material:
(i) Steel.
(ii) Poured reinforced concrete.
(iii) Precast concrete modules.
(iv) Solid masonry.
(v) Other materials approved by the
department.
(b) Cracks
and seams shall be sealed to prevent leakage.
(c) Walls shall not be more than 6 feet in
height above interior grade unless provision is made for normal access and
necessary emergency access to tanks, valves, and other equipment and for the
safe exiting from the secondary containment facility.
(d) Walls that are constructed of concrete or
solid masonry shall rest upon a floating base of concrete that is prepared as
specified in subrule (7) (a) of this rule or upon suitable concrete footings
that extend below the average frost depth to provide structural integrity.
Joints between walls and base shall be made watertight.
(e) Piping shall not be installed through the
secondary containment wall, except for interconnections between multiple
secondary containment structures.
(6) Base requirements for secondary
containment areas are as follows:
(a) The
base of a secondary containment area shall slope to a watertight catch basin or
sump where accumulated liquids can be removed.
(b) The base and any earthen walls of the
secondary containment area shall be lined with concrete, steel, or approved
synthetic liners.
(7)
Liner requirements for secondary containment areas are as follows:
(a) Concrete liners shall be designed
according to good engineering practices to withstand any foreseeable loading
conditions, including a full hydrostatic head of discharged fluid and static
loads of storage containers, including appurtenances, equipment, and contents.
Cracks and seams shall be sealed to prevent leakage.
(b) Steel plates may be used for wall and
base liners. Installation plans shall be approved by the department. The plates
shall be protected against corrosion and joined in a manner to provide
watertight joints.
(c) Synthetic
liners and installation plans shall be approved by the department. A synthetic
liner will not be approved by the department until the manufacturer of the
liner provides the department with a written confirmation of compatibility and
a written estimate of the life expectancy of the liner.
(d) Synthetic liners shall have a minimum
thickness of 30 mils (0.8 millimeters) and be compatible with the materials
being stored within the facility.
(e) Synthetic liners shall be installed under
the supervision of a qualified representative of the manufacturer and all
field-constructed seams shall be tested and repaired, if necessary, in
accordance with the manufacturer's recommendations.
(f) Prefabricated diked areas shall not have
a relief outlet or discharge valve. The base shall slope to a collecting spot
where storm water can be discharged by a manually activated pump for use in the
blending process or for proper disposal in accordance with the provisions of R
285.640.11.
(g) The department may
approve the use of experimental materials upon written confirmation from the
manufacturer regarding the pertinent specifications of the material for use in
pesticide containment.
(8) Catch basin or sump requirements for
secondary containment areas are as follows:
(a) The sump construction shall conform to
the thickness specifications, on all sides including the base of the sump, for
the remainder of the containment area base and shall be watertight.
(b) Discharge valves or drains shall not be
plumbed into the sump unless the requirements of subdivision (d) of this
subrule are met.
(c) Design and
construction specifications for the sump shall address sediment accumulation,
sediment removal, and freeze-thaw cycles.
(d) An exception for allowing discharge
valves or drains to be plumbed into the sump may be granted if a catchment
system that includes a catch drain, discharge valve, and concrete sump tank, as
described in this subdivision, is operational and if all of the following
conditions are met:
(i) The containment area
and discharge valve or drain shall be in existence before the effective date of
this rule. Construction of containment areas with discharge valves or drains
will not be permitted after the effective date of this rule.
(ii) Concrete-lined areas shall have a
recessed catch drain that runs through the center of the base. The catch drain
shall be a minimum of 6 inches deep and 12 inches wide with an open grate
cover.
(iii) The concrete slab that
is located beneath the catch drain shall be at least the same thickness below
and to the sides of the drain as the base is throughout the containment area
and shall be in compliance with the provisions of R 285.640.8(6)(a).
(iv) The concrete base shall slope to the
drain, and the drain shall slope to a discharge valve at the edge of the
dike.
(v) The discharge valve shall
be closed and secured at all times, except when in use as specified in
paragraph (vi) of this subdivision, at which times it shall be attended by
responsible personnel.
(vi) The
discharge valve shall drain to an underground concrete sump tank that has a
maximum capacity of 1,200 gallons. A self-priming recovery pump shall be used
to move all materials from the tank to alternate contained storage. The sump
tank shall be used as a temporary catchment only. The sump tank shall be pumped
at least weekly during non-winter months to remove any water or pesticide
material that it collects.
(vii)
Liquids that accumulate in this type of catchment system shall be managed in
accordance with the provisions of R 285.640.11(2)(a) only.
(9) Facilities that are placed in
service after the effective date of this rule shall immediately comply with
this rule. Facilities that are in service before the effective date of this
rule shall have 2 years to comply with this rule.
Notes
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