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17a<br />

exempting several kinds of discharges from the<br />

NPDES permit program. Exempted discharges included<br />

discharges from storm sewers composed entirely<br />

of storm runoff uncontaminated by industrial<br />

or commercial activity, discharges from relatively<br />

small animal confinement facilities, discharges from<br />

silvicultural activities, and irrigation return flow<br />

from point sources where the flow was from less than<br />

3000 acres. The exemption for discharges from silvicultural<br />

activities provided:<br />

The following do not require an NPDES permit:<br />

...<br />

(j) Discharges of pollutants from agricultural<br />

and silvicultural activities, including irrigation<br />

return flow and runoff from orchards,<br />

cultivated crops, pastures, rangelands,<br />

and forest lands, except that this exclusion<br />

shall not apply to the following:<br />

...<br />

(5) Discharges from any agricultural or<br />

silvicultural activity which have been<br />

identified by the Regional Administrator of<br />

the Director of the State water pollution<br />

control agency or interstate agency as a<br />

significant contributor of pollution.<br />

40 C.F.R. § 125.4 (1975). The Natural Resources Defense<br />

Council challenged the regulations as inconsistent<br />

with the statute. See Natural Res. Def. Council<br />

v. Train, 396 F. Supp. 1393 (D.D.C. 1975).<br />

EPA defended the challenged regulations on the<br />

ground “that the exempted categories of sources are<br />

ones which fall within the definition of point source<br />

but which are ill-suited for inclusion in a permit pro-

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