ATCP 29.54 Note Note: See also ss. NR 812.38 and SPS 382.41.

ATCP 29.54(3) (3) Chemigation water supply. No chemigation system may draw water directly from a potable water supply. A chemigation system may draw water from a pond or reservoir to which water has been pumped from a potable water supply, provided that there is an unobstructed vertical air gap between the potable water supply outlet and the flood level of the pond or reservoir. The air gap shall be at least 2 feet, or at least twice the diameter of the effective opening of the water supply outlet, whichever is greater.

ATCP 29.54(4) (4) Chemigation system; construction materials.

ATCP 29.54(4)(a) (a) A chemigation system shall be resistant to corrosion, puncture, and cracking.

ATCP 29.54(4)(b) (b) Every chemigation system component that may come into contact with pesticides shall be chemically compatible with every pesticide used in the system. Before using any pesticide in a chemigation system, the user shall obtain a written confirmation of chemical compatibility from the system manufacturer or the pesticide manufacturer. The user shall keep the written confirmation on file, and shall make it available to the department for inspection and copying upon request.

ATCP 29.54(5) (5) Pesticide injected into chemigation system.

ATCP 29.54(5)(a) (a) No pesticide may be injected into a chemigation system unless the pesticide is labeled for application by chemigation.

ATCP 29.54(5)(b) (b) No pesticide may be injected into a chemigation system contrary to, or inconsistent with, label directions.

ATCP 29.54(5)(c) (c) Every chemigation system shall be properly calibrated to apply the pesticide at the application rate specified on the pesticide label.

ATCP 29.54(5)(d) (d) The point at which pesticides are injected into a chemigation system shall be located downstream from all devices required under subs. (7) to (10).

ATCP 29.54(5)(e) (e) No pesticide may be injected into an urban pesticide misting system unless the pesticide is labeled for application by misting.

ATCP 29.54(5)(f) (f) A rain sensor and a wind sensor must be installed on an urban pesticide misting system to prevent drift and control runoff.

ATCP 29.54(5)(g) (g) A legible copy of the label must be securely attached to an urban pesticide misting system’s reservoir tank or on the outside of the system timer.

ATCP 29.54(6) (6) Pesticide supply tank. No container used to hold pesticides for injection into a chemigation system may be located less than 8 feet horizontally from any water supply, including any well head or surface water source. The pesticide container, pesticide injection unit, and all connections between the pesticide container and injection unit shall be located within secondary containment that complies with ss. ATCP 33.40, 33.42, and 33.44.

ATCP 29.54(7) (7) preventing backflow. A chemigation system shall comply with the following requirements unless the system draws nonpotable water from a privately-owned watertight container or impoundment that is protected by an air gap under sub. (3):

ATCP 29.54(7)(a) (a) A reduced pressure principle backflow preventer shall be installed in every chemigation system, except as provided under pars. (b) to (d). The reduced pressure principle backflow preventer shall be all of the following:

ATCP 29.54(7)(a)1. 1. In compliance with s. SPS 382.41.

ATCP 29.54(7)(a)2. 2. Installed according to the manufacturer’s specifications in the water supply pipeline between the supply pump discharge and the point at which pesticides are injected.

ATCP 29.54(7)(a)3. 3. Maintained in fully operational condition.

ATCP 29.54(7)(a)4. 4. Tested annually by a tester who is currently listed with the department of safety and professional services as a backflow tester.

ATCP 29.54(7)(a)5. 5. Protected so that it does not freeze.

ATCP 29.54 Note Note: The department of safety and professional services can provide a list of persons qualified to test reduced pressure principle backflow preventers.

ATCP 29.54(7)(b) (b) A barometric loop may be installed in a chemigation system, in place of a reduced pressure principle backflow preventer under par. (a), if the chemigation system is not subject to back pressure. The barometric loop shall extend to an elevation at least 35 feet above the highest outlet in the chemigation system. The loop shall be installed in the water supply pipeline between the supply pump discharge and the point at which pesticides are injected.

ATCP 29.54(7)(c) (c) Two check valves may be installed in a chemigation system, in place of a reduced pressure principle backflow preventer under par. (a), if the chemigation system draws from surface waters. The check valves shall be connected in series, and shall be installed in the water supply pipeline between the supply pump discharge and the point at which pesticides are injected. Each check valve shall comply with par. (e), and shall be preceded by a vacuum relief valve under par. (g) and an automatic low pressure drain valve under par. (h).

ATCP 29.54(7)(d) (d) A check valve followed by a gooseneck loop may be installed in a chemigation system, in place of a reduced pressure principle backflow preventer under par. (a), if all of the following conditions are met:

ATCP 29.54(7)(d)1. 1. The chemigation system draws water from surface waters that are higher in elevation than the surface being chemigated.

ATCP 29.54(7)(d)2. 2. The check valve complies with par. (e), and is preceded by an automatic low pressure drain valve under par. (h).

ATCP 29.54(7)(d)3. 3. The gooseneck loop complies with par. (f).

ATCP 29.54(7)(e) (e) A check valve under par. (c) or (d) shall be all of the following: