Current through Register No. 12, March 21, 2024
(a) No
person shall apply a pesticide through an irrigation system, or a chemigation
system, unless the system complies with this section.
(b) Any method used for chemigation shall
comply with the state plumbing code and Env-Ws 364 "Cross Connection
Prevention" rules.
(c) No pesticide
shall be injected into a chemigation system in a manner inconsistent with label
directions.
(d) Every chemigation
system shall be properly calibrated to apply the pesticide at the application
rate specified on the pesticide label.
(e) Every component of a chemigation system
shall be resistant to corrosion, puncture and cracking. Every component of a
chemigation system which might come into contact with pesticides, or with water
containing pesticides, shall be chemically compatible with every pesticide used
in the system.
(f) The following
anti-pollution measures shall be used with a chemigation system:
(1) The water supply shall be protected
against backflow by locating a backflow preventer as specified by
Env-Ws
364.06 between the water supply and the location of
chemical injection;
(2) An
automatic low pressure drain shall be installed which:
a. Shall be placed on the bottom side and
lowest point of the irrigation line between the irrigation pump and the water
supply line check valve;
b. Shall
be level and shall not extend beyond the inside surface of the bottom of the
pipe; and
c. Shall be placed so
that drained liquid will flow away from any nearby wellhead or surface
water;
(3) An interlock
shall be installed between the irrigation pump and chemical injection unit to
avoid chemical flow into the irrigation line if the irrigation pump
stops;
(4) The chemical injection
line shall have a check valve to stop the flow of water from the irrigation
system into the chemical supply;
(5) Pesticide container(s) used to hold
pesticides for injection into a chemigation system shall not be located within
400 feet from gravel packed wells used for public water supply or within 250
feet of other wells so used;
(6)
Pesticide container(s) used to hold pesticides for injection into a chemigation
system shall be located at least 75 feet horizontally from a private water
supply well or the high water mark of surface water unless total amount of
pesticide(s) used at the site is 5 gallons or less of liquid pesticide, or 50
pounds or less of non-liquid pesticide and secondary containment is provided;
and
(7) Secondary containment
pursuant to (6) above shall be:
a. Located so
that the outside edge of secondary containment is at least 10 feet from any
water supply including any well head or surface water source;
b. Constructed of materials compatible with
the pesticide being handled; and
c.
Capable of containing 110% of the volume of the pesticide container.
#150, eff 1-9-74; ss by #2209, eff 12-13-82; ss by #2781,
eff 7-26-84; ss by #4867, eff 7-19-90; ss by #6258, eff 5-30-96; ss by #7890,
eff 5-19-03; ss by #7890, eff 5-19-03; ss and moved by #8131, eff 8-13-04 (from
Pes 502.08 )
