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Appendix C <br />General Drift Minimization <br />Introduction The following drift minimization measures are recommended permit <br />conditions for those pesticides that are restricted materials, in addition to the <br />drift minimization measures described on the pesticide label. Applicators are <br />encouraged to utilize these measures for other pesticides whenever possible to <br />minimize environmental contamination from drift. <br />I. AIRCRAFT <br />A. Aircraft application equipment used to apply a pesticide spray solution shall be <br />configured as follows: <br />1. Functional boom length, measured from outboard nozzle to outboard nozzle, shall not <br />exceed 75% of the overall wing span or rotor length. <br />2. Boom pressure shall not exceed 40 pounds per square inch for the nozzles being used. <br />3. The flow of liquid from each nozzle shall be controlled by a positive shutoff system. <br />4. Nozzle orifices shall be directed backward, neutral to the airstream. <br />5. Aircraft shall be equipped with: <br />(a) Jet nozzles having an orifice of not less than one -sixteenth of an inch in diameter. <br />Nozzles shall not be equipped with any device or mechanism which would cause <br />a sheet, cone, fan, or similar type dispersion of the discharged material, except <br />helicopters operating at 60 miles per hour or less may add a number 46 (or <br />equivalent) or larger whirlplate; <br />(b) Helicopters operating at 60 miles per hour or less may, instead of (a), be equipped <br />with fan nozzles with a fan angle number not larger than 80 degrees and a flow <br />rate not less than one gallon per minute at 40 pounds per square inch pressure (or <br />equivalent); or <br />(c) After evaluation, the director may authorize other nozzles for aircraft use. <br />B. Aerial applications of a pesticide spray solution shall meet the following requirements: <br />1. Apply only when there is a positive air flow. Wind speed shall not be more than ten <br />miles per hour at the application site, as measured by an anemometer positioned four <br />feet above the ground. <br />2. Discharge shall start after entering the target site; discharge height shall not exceed <br />ten feet above the crop or target; discharge shall be shut off whenever necessary to <br />raise the equipment over obstacles; discharge shall be shut off before exiting the <br />target site. <br />Continued on next page <br />(Rev. 2-11) C-1 <br />