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29a<br />

The core of the EPA and Forest Service argument<br />

was that “pest ... control” was one of the activities<br />

listed in the Silvicultural Rule as not constituting<br />

a point source discharge. We wrote:<br />

The Forest Service’s argument fails because<br />

the statute itself is clear and unambiguous.<br />

The statutory definition of point source, “any<br />

discernible, confined and discrete conveyance,<br />

including but not limited to any ...<br />

vessel,” 33 U.S.C. § 1362(14), clearly encompasses<br />

an aircraft equipped with tanks<br />

spraying pesticide from mechanical sprayers<br />

directly over covered waters. The Forest Service<br />

cannot contravene the will of Congress<br />

through its reading of administrative regulations.<br />

Forsgren, 309 F.3d at 1185–86.<br />

We pointed out that the Rule characterized a<br />

pest control discharge as nonpoint only when it was<br />

“silvicultural pest control from which there is natural<br />

runoff.” Id. Dat 1186 (emphasis in original). If pest<br />

control activity resulted in natural runoff, that runoff<br />

was not a point source discharge under<br />

§ 502(14). But it was undisputed in Forsgren that<br />

aerial spraying of pesticide into streams was not<br />

“natural runoff.” We had no occasion to rule on, and<br />

did not discuss, whether silvicultural activities from<br />

which there is natural runoff that is channeled, controlled,<br />

and discharged through a “discernible, confined<br />

and discrete conveyance” is a point source under<br />

§ 502(14).<br />

We emphatically “reject[ed] the Forest Service’s<br />

argument that the EPA has the authority to ‘refine’<br />

the definitions of point source and nonpoint source

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