WAC 16-231-530. Restrictions due to wind conditions in Whitman County

(1) Areas 1 and 3. The use or application of use restricted herbicides is prohibited when the mean sustained wind velocity is over twelve miles per hour. (2) Area 4. The use or application of use restricted herbicides is prohibited when the mean sustained wind velocity is over twelve miles per hour: Provided, That ground applications of use restricted herbicides in conformance with 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 very coarse (or larger) range as defined by the ASABE standards are allowed when the mean sustained wind velocity is fifteen miles per hour or less and allowed by the label.