Current through Register Vol. 47, No. 17, September 10, 2024
All mixing and loading area operations for liquid
pesticides must take place on a pad that meets the following
requirements:
13.5. Capacity
The mixing and loading pad shall provide at least the
following capacity:
(a) The pad shall
be of adequate size and design to contain 125% of the volume of the largest
container to be loaded or unloaded if unprotected from precipitation or 110% of
the volume of the largest container to be loaded or unloaded if protected from
precipitation.
(b) If any storage
container or mobile container to be loaded or unloaded has a capacity of
greater than 1200 gallons the containment volume need only be large enough to
hold a minimum of 1500 gallons if unprotected from precipitation or 1320
gallons if protected from precipitation. If the primary use of the pad is to
load and unload spray equipment and associated support vehicles and bulk
transport vehicles use the pad only for occasional delivery of pesticides then
the pad size shall be determined by the volume of the largest container on the
spray equipment or support vehicles provided the pad is designed so that bulk
transport vehicles can conduct their occasional operations with all their
appurtenances over the pad.
13.6. Pesticide discharges or precipitation
accumulations on a mixing and loading area shall be immediately recovered such
that the capacity listed in ¶ 13.5 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 the
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.
13.7.
General Requirements
(a) Provided the
required containment capacity of ¶ 13.5. is met, pads need only be large
enough so that the tank and appurtenances are physically over the pad provided
no flushing of the boom system occurs.
(b) Pads for mixing and loading areas shall
be constructed of liquid-tight, reinforced concrete or other material so as to
form an impervious barrier between the pesticide handling area and the
surrounding earth.
(c) The mixing
and loading pad shall be designed to prevent storm water runoff from moving
onto or across the mixing and loading pad.
(d) The mixing and loading pad shall not have
any outlet points.
(e) The pad
shall be constructed to a permeability rate that does not 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.
(f) The
pad must be maintained as impervious for the usable life of the
structure.
(g) The pad must be able
to handle the wheel loads of any vehicles using it.
(h) Mixing and loading pads shall be designed
to drain liquids to a sump.
(i)
Sumps shall be drained only by a manually activated pump during the operating
season of the facility. Automatic pumps may be used during the inactive
season.
(j) Sumps shall be
constructed of materials which are watertight and resist corrosion or are
treated to resist corrosion from pesticides.
