Ground applications of use restricted herbicides shall conform to the manufacturer's specified combination of nozzle type/size and pressure in pounds per square inch (psi) at the nozzle that produces a spray droplet size that falls within the medium (or larger) range as defined by the ASABE standards: Provided, That a pressure of 50 psi at the nozzle is the maximum that can be used for handgun applications when no manufacturer specified combination of nozzle and pressure for droplet size are available for that equipment. Upon request by the department the applicator shall provide all data which supports the nozzle configuration is compliant with the spray droplet classifications of medium or larger.
[Statutory Authority: RCW
15.58.040 and
17.21.030. WSR 19-02-039, § 16-230-655, filed 12/26/18, effective 1/26/19. Statutory Authority: Chapters
17.21, 15.58, and
34.05 RCW. WSR 07-11-041A, § 16-230-655, filed 5/9/07, effective 6/9/07. Statutory Authority: Chapters
15.58 and
17.21 RCW. WSR 88-05-033 (Order 1965), § 16-230-655, filed 2/12/88; WSR 87-09-015 (Order 1923), § 16-230-655, filed 4/6/87; WSR 80-03-041 (Order 1680), § 16-230-655, filed 2/20/80.]