WOTUS website: www.epa.gov/nwpr

Overall webinar on WOTUS: https://www.epa.gov/nwpr/navigable-waters-protection-rule-webcast

Factsheets: https://www.epa.gov/nwpr/navigable-waters-protection-rule-factsheets

Also the 311 section in the RPA, if you think that would be helpful.

https://www.epa.gov/nwpr/navigable-waters-protection-rule-supporting-documents