...conveyances or systems of conveyances (including but not limited to pipes, conduits, ditches, and channels) used for collecting and conveying precipitation runoff and which are not contaminated by contact with or that has not come into contact with, any overburden, raw material, intermediate...

...conveyances or systems of conveyances (including but not- limited to pipes, conduits, ditches, and channels) used for collecting and conveying precipitation runoff and which are not contaminated by contact with or that has not come into contact with, any overburden, raw material, intermediate...

...return flows from irrigated agriculture or storm water runoff. As used herein, "stormwater runoff* means discharges from conveyances or systems of conveyances...toxic pollutant effluent standards or prohibitions, established pursuant to Sec. 1(17, hazardous substances in reportable quantities, or oil and grease....

...conduits, ditches, and channels) primarily used for collecting and conveying precipitation runoff and 894 which are not contaminated with process wastes, raw...toxic pollutant effluent standards or prohibitions, established pursuant to Sec. 307, hazardous substances in reportable quantities, or oil and grease....

...return flows from irrigated agriculture or stormwater runoff. As used herein, "stormwater runoff" ^eans discharges from conveyances or systems of convey"ances...and which are not contaminated with process wastes, ~aw materials, toxic pollutants in excess of toxic pollutant effluent standards or prohibitions, hazardous...

...conveyances or systems of conveyances (including but not limited to pipes, conduits, ditches, and channels) used For collecting and conveying precipitation runoff and which are not contaminated by contact with, or do not come into contact with, any overburden, raw material, intermediate products,...

...conveyances or systems of conveyances (including but not limited to pipes, conduits, ditches, and channels) used for collecting and conveying precipitation runoff and which are not contaminated by contact with or that has not come into contact with any overburden, raw material, intermediate products,...

...conveyances or systems of conveyances (including but not limited to pipes, conduits, ditches, and channels) used for collecting and conveying precipitation runoff and which are not contaminated by contact with, or do not come into contact with, any overburden, raw material, intermediate products,...

...conveyances or systems of conveyances (including but not limited to pipes, conduits, ditches, and channels) used for collecting and conveying precipitation runoff and which are not contaminated by contact with, or do not come into contact with, any overburden, raw material, intermediate products,...

...conveyances or systems of conveyances (including but not limited to pipes, conduits, ditches. and channels) used for collecting and conveying precipitation runoff and which are not contaminated by contact with, or do not come into contact with, any overburden, raw material, intermediate products,...