35 Ill. Adm. Code 212.314
Exception for Excess Wind Speed
Section 212
Section 212.314 Exception
for Excess Wind Speed
Section 212.301 of this Subpart
shall not apply and spraying pursuant to Sections 212.304 through 212.310 and
212.312 of this Subpart shall not be required when the wind speed is greater
than 40.2 km/hr (25 mph). Determination of wind speed for the purposes of this
rule shall be by a one-hour average or hourly recorded value at the nearest
official station of the U.S. Weather Bureau or by wind speed instruments
operated on the site. In cases where the duration of operations subject to
this rule is less than one hour, wind speed may be averaged over the duration
of the operations on the basis of on-site wind speed instrument measurements.