Current through Register Vol. 47, No. 17, September 10, 2024
13.1. All bulk
liquid pesticide must be stored in a facility that meets the following
requirements:
13.2. The secondary
containment structure shall provide at least the capacity of the largest
storage container within the secondary containment structure, plus the total
volume of discharged liquid which would be displaced by the submerged portions
of all other storage containers, appurtenances, fixtures and materials located
within the secondary containment structure, if the structure were filled to
capacity with discharged liquid, plus:
(a) When unprotected from precipitation, an
additional twenty-five percent of the capacity of the largest storage container
located within the secondary containment structure.
(b) When protected from precipitation, an
additional ten percent of the capacity of the largest container located within
the secondary containment structure.
13.3. Pesticide discharges or precipitation
accumulations in a secondary containment structure shall be immediately
recovered such that the capacity listed in ¶ 13.2 above is available at
all times. Pesticide discharges, rinsates, or precipitation containing
pesticide material recovered may be utilized for its intended purpose if it can
be applied according to label or properly disposed of according to state or
federal law. The facility shall have items on hand and readily available to
recover discharges to the maximum extent possible.
13.4. General Requirements
(a) All primary containment shall be located
within a secondary containment structure.
(b) Structural materials and integrity shall
provide secondary containment which meets or exceeds the requirements of these
rules.
(c) The walls and floor of a
secondary containment structure shall be designed according to good engineering
practices and shall be constructed of materials that are compatible with the
pesticide, or that resist or are treated to resist corrosion due to exposure
from the pesticide.
(d) The
secondary containment structure shall be constructed to a water permeability
rate not to exceed 1 x 10-7 centimeters per second (~0.0035 inches per day) or
a citation provided that identifies a material's specification that when
followed will provide an equivalent permeability.
(e) The walls and floor of the secondary
containment structure must be maintained as impervious to liquids for the
usable life of the structure.
(f)
The floor of the secondary containment structure must support the gravity load
of full tanks.
(g) The walls of the
secondary containment structure must withstand static and dynamic hydraulic
loads from the equilibrium liquid level.
(h) The walls of the secondary containment
structure adjacent to tanks must withstand dynamic hydraulic loads from liquid
discharged from a ruptured tank.
(i) The floor of the secondary containment
structure shall be designed to drain liquids to a sump.
(j) Sumps shall be drained only by a manually
activated pump. Automatic pumps may be used during the inactive season provided
all tanks in the secondary containment structure are empty.
(k) Sumps shall be constructed of materials
which are watertight and resist corrosion or are treated to resist corrosion
from pesticides.
(l) The secondary
containment structure shall not have an outlet or gravity drain through the
wall or floor.
(m) No piping shall
be installed through the containment wall or floor.
(n) The walls of the secondary containment
structure shall be of such a height as to allow easy inspection of the tank(s)
from outside the containment as well as easy egress from the containment
area.
(o) There shall be sufficient
clearance between each tank and the wall of the secondary containment structure
to allow for visual inspection of tanks from all sides.
(p) Electrical controls in the secondary
containment structure shall be elevated above the level of the containment
wall.
(q) Clay, natural soil-clay
mixtures, clay-bentonite mixtures, or prefabricated bentonite liners shall not
be used to contain any bulk pesticide.
(r) Synthetic Liners.
(1) The facility manager must obtain written
confirmation of compatibility, durability, and a written estimate of the life
of the synthetic liner from the manufacturer. This document must be kept at the
facility as a permanent record.
(2)
Synthetic liners shall be installed as per manufacturer's specifications and
under the supervision of a qualified representative of the manufacturer, and
all seams shall be tested, and repaired if necessary, in accordance with the
manufacturer's recommendations.
(s) Prefabricated Facilities.
(1) A prefabricated secondary containment
structure shall be composed of a rigid prefabricated basin having both a base
and walls constructed of steel, reinforced concrete or synthetic materials
which are resistant to corrosion, puncture or cracking.
(2) A written confirmation of compatibility
and estimate of life expectancy from the basin manufacturer shall be kept on
file at the nearest local office from which the storage structure is
administered.
(3) The prefabricated
facility shall be designed and installed to withstand all foreseeable loading
conditions, including the tank load.
