WAC 16-230-670   Use restricted herbicides -- Eastern Washington -- Aircraft boom length and pressure requirements.  In all Areas 1 and 2, of all counties restricted by rule the working boom length on fixed wing aircraft shall not exceed 3/4 of the wing span and the working boom length on helicopters shall not exceed 6/7 of the total rotor length or 3/4 of the total rotor length where the rotor length exceeds forty feet.

     Pressure for aerial equipment shall not exceed 25 psi at the nozzles: Provided, That helicopters shall be allowed to use up to 35 psi in Areas 3 and 4 of all counties restricted by rule: Provided further, That pressure up to 50 psi at the nozzle may be used with invert systems which are allowed by written permit only.



[Statutory Authority: Chapters 17.21, 15.58, and 34.05 RCW. 07-11-041A, § 16-230-670, filed 5/9/07, effective 6/9/07. Statutory Authority: Chapters 15.58 and 17.21 RCW. 91-06-019 (Order 2073), § 16-230-670, filed 2/26/91, effective 3/29/91; 80-03-041 (Order 1680), § 16-230-670, filed 2/20/80.]