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<br />~ <br />C> <br />en <br />C> <br /> <br />. <br /> <br />hogs, lO,OOO sheep, etc., are excluded from the National Pollution <br /> <br />. <br /> <br />Discharge Elimination System (NPDES). <br /> <br />Response of irrigators. The individual or organization that con- <br /> <br />troIs or is responsible for dhcharge of irrigation return flow must ap- <br /> <br />. <br /> <br />ply for the permit. The individual farm operator is not necessarily <br /> <br />responsible for the application. Thus, an irrigation organization that <br /> <br />controls return flow from 3000 acres to navigable waters must apply <br /> <br />. <br /> <br />even though one individual may be supplied with water for 3000 acres <br /> <br />or more. Land serviced by IlOO irrigation organizations in the United <br /> <br />. <br /> <br />States providing water to 3000 or more acres represent 80 percent of <br /> <br />all acreage irrigated by such organizations. <br /> <br />Point sources outside the general exclusion may be identified by <br /> <br />. <br /> <br />EPA, and included in NPDES requirements. Also, owners and operators <br /> <br />of excluded point sources are still subject to other provisions of the <br /> <br />. <br /> <br />Act. <br /> <br />Response of livestock producers. Cattle feeding operations repre- <br /> <br />sent the largest single livestock category to which NPDES' applies in the <br /> <br />. <br /> <br />Colorado River Basin. Statistics on size of cattle feed lots are readily <br /> <br />available only on a state basis. Data available for Nevada, Utah, and <br /> <br />Wyoming show no feedlots would require discharge permits because of <br /> <br />. <br /> <br />size of operations. <br /> <br />A set of s.tudies on economic impacts and responses have been <br /> <br />. <br /> <br />completed for the major kinds of livestock in the United States (USDA/ <br /> <br />22 <br /> <br />. <br />