For purpose of this new source performance standard only, ``new source'' means a source which is constructed at a site at which no other source covered by this part is located. Any new source subject to this subpart must achieve the following new source performance standards (NSPS): There shall be no discharge of process wastewater pollutants into navigable waters. [46 FR 8285, Jan. 26, 1981, as amended at 46 FR 57287, Nov. 23, 1981]