N.H. Admin. Code § Pes 502.06

Current through Register No. 2, January 9, 2025

Section Pes 502.06 - Application by Chemigation

(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 "Backflow 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 364.04(e) 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 waters or their tributaries used for public water supply;

b. Constructed of materials compatible with the pesticide being handled; and

c. Capable of containing 110% of the volume of the pesticide container.

N.H. Admin. Code § Pes 502.06

#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 #7553, eff 9-5-01; ss by #7890, eff 5-19-03; ss and moved by #8131, eff 8-13-04 (from Pes 502.07)

Ss by #10333, eff 5/10/2013 (from Pes 502.07).