(1) Area 2B description. An area including all lands lying within a boundary line beginning at the intersection of the Union Pacific Railroad and U.S. Highway 12 in Section 10, T7N, R31E; thence southerly along Highway 12 approximately three miles until its intersection with the Walla Walla River; thence west along the Walla Walla River until its intersection with the Columbia River and the Walla Walla-Benton County line; thence northwesterly along the Columbia River approximately ten miles until its intersection with the Snake River; thence northeasterly along the Snake River until its intersection with Highway 12 in Section 35, T9N, R30E; thence southeasterly along Highway 12 to the point of beginning.

(2) Area 2B restrictions.

(a) Application by air of use restricted pesticides as defined in WAC 16-232-007 is prohibited.

(b) The use or application of low volatile ester formulations of use restricted herbicides is prohibited: Provided, That hormone sprays may be applied by aircraft to orchards for the prevention of fruit drop.

(c) On and after April 5th through October 31st of each year, applications of use restricted herbicides are prohibited daily from three hours prior to sunset until two hours after sunrise the following morning: Provided, That applications of use restricted herbicides are exempt from the sunset and sunrise restrictions when using an application rate of forty gallons of water carrier or greater per treated acre 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: Provided further, That applications of granular and pellet formulations of the use restricted herbicides are exempt from the sunset and sunrise restrictions: Provided further, That applications of use restricted herbicides on small experimental plots for research purposes are exempt from the sunset and sunrise restrictions.