(1) Area 6 description. An area including all lands lying within a boundary line beginning at the Snake River and the east section line of Section 23, T9N, R31E; thence south approximately twelve miles along section lines to 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 two miles to the southern section line of Section 8, T7N, R31E; thence east approximately two miles along the section line until its intersection with U.S. Highway 12 in Section 10, T7N, R31E; thence northwesterly along U.S. Highway 12, approximately three-quarters of a mile until its intersection with the Union Pacific Railroad; thence northerly approximately four miles along the railroad until its intersection with the southern section line in Section 15, T8N, R31E; thence east approximately one-quarter mile along the section line to the southeast corner of Section 15, T8N, R31E; thence north approximately three miles until its intersection with SR 124; thence west along SR 124 approximately two and one-half miles until its intersection with the Bonneville Power Administration power line in Section 32, T9N, R31E; thence northwesterly along the power line until its intersection with the Snake River in Section 25, T9N, R30E; thence northeasterly along the Snake River to the point of beginning.

(2) Area 6 restrictions.

(a) The use or application of low volatile ester formulations of use restricted herbicides shall be prohibited on and after April 5th through October 31st of each year: Provided, That hormone sprays may be applied by aircraft to orchards for the prevention of fruit drop.

(b) On and after April 5th through October 31st of each year, all applications of use restricted herbicides are prohibited daily from three hours prior to sunset to sunrise the following morning: Provided, That applications of use restricted herbicides are exempt from the sunset 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 restrictions: Provided further, That applications of use restricted herbicides on small experimental plots for research purposes are exempt from the sunset restrictions.

(c) On and after April 5th through October 31st of each year, aerial applications of use restricted herbicides are prohibited daily from three hours prior to sunset until two hours after sunrise the following morning.