- SIC Code Tables for applicability, including the addition of North American Industry Classification System (NAICS) codes for consistency with the EPA’s MSGP, and updated SIC code descriptions to be consistent with Occupational Health and Safety Administration’s (OSHA’s) descriptions.
- Provisional coverage after the postmark date for paper applications will be changed from 7 days to 48 hours.
- Delegation of Signatories Letters will be submitted through STEERS.
- Revision of Sector-Specific Numeric Effluent Limitations tables in Part V to clarify which specific SIC activities require monitoring (requiring reporting through NetDMR unless the applicant qualifies for and obtains an eReporting waiver).
- Adjusted benchmark values based on data collected during the 2017-2019 permit years:
- Sector T. Lowered the benchmark value for biochemical oxygen demand (BOD) from 20 mg/L to 15 mg/L.
- Sector U (SIC codes 2074-2079): Lowered total suspended solids from 100 mg/L to 50 mg/L
- Changes to Monitoring and Reporting Requirements, including clarification of how to report sampling and monitoring results under eReporting/NetDMR (benchmark, sector-specific numeric effluent limitations, hazardous metals, and pollutants of concern).
- Additional items will be added to the Notice of Intent, including sector-specific activities with Numeric Effluent Limitation Guidelines, discharging a pollutant of concern, and active/inactive facility status.
- A Notice of Change will be required for new items including the changing status of a facility, changing outfall locations, requesting permission to stop benchmark monitoring after two years, and requesting waiver from hazardous metals monitoring.
- Documentation of the criteria for claiming a waiver from monitoring hazardous metals must be included in the SWP3.