The Department may establish and include in an NPDES permit, any permit condition, as needed on a case-by-case basis, to assure protection of surface waters. These conditions may include a requirement to identify and implement the following:

1. (1) BMPs reasonably necessary to achieve effluent limitations or standards or to carry out the purpose and intent of the Federal Act.
2. (2) Toxic reduction activities, effluent limitations based on WETT, and other measures that eliminate, or substantially reduce releases of pollutants at their source.