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Appendix C <br /> General Drift Minimization <br /> Introduction The following drift minimization treasures 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 /> I. 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 />