 What is a TMDL?  San Joaquin River DO TMDL Overview  TMDL Control Program & Phase II MS4 Permit Sue McConnell (Senior WRCE) (916) Christine Joab (Environmental Scientist) (916) Phase II MS4 SJR DO TMDL 22 Jan

 Waters not meeting water quality standards (objectives)  Impaired water bodies list  TMDL = Planning and Management Tool  Identify, quantify and control sources  Implement Control Program (actions, time schedule, monitoring)  Regulatory Programs  NPDES Permits (Municipal, Industrial & Storm Water)  Waste Discharge Requirements (WDRs)  401 Water Quality Certifications  Technical and Monitoring Report Requirements Phase II MS4 SJR DO TMDL 22 Jan

3 Port of Stockton Impaired Reach Turner Cut Disappointment Slough

Phase II MS4 SJR DO TMDL 22 Jan DO TMDL Source Area Impaired Reach of the DWSC San Joaquin River Friant Dam Mendota Pool

 TMDL Studies - 3 Contributing Factors  Channel Geometry  Flow through the Channel  Upstream Oxygen Demanding Substances  City of Stockton WWTP discharges  Algae and nutrients from upstream watershed  Other upstream point sources (includes NPDES & Storm Water) Phase II MS4 SJR DO TMDL 22 Jan

 Contributors collectively responsible  Work together to implement TMDL  Actions Implemented within Watershed  Stockton WWTP upgrade  Aeration Facility operation  Watershed studies and new WDRs for Ag  Phase II MS4 – TMDL Implementation  Minimize, control and prevent discharge  Annual Report submittal Phase II MS4 SJR DO TMDL 22 Jan