San Joaquin River Stockton Deep Water Ship Channel

San Joaquin River Stockton Deep Water Ship Channel Dissolved Oxygen TMDL v What is a TMDL? v San Joaquin River DO TMDL Overview v TMDL Control Program & Phase II MS 4 Permit Sue Mc. Connell (Senior WRCE) (916) 464 -4798 Christine Joab (Environmental Scientist) (916) 464 -4655 Phase II MS 4 SJR DO TMDL 22 Jan 2014 1

What is a TMDL? v Waters not meeting water quality standards (objectives) v Impaired water bodies list v TMDL = Planning and Management Tool v Identify, quantify and control sources v Implement Control Program (actions, time schedule, monitoring) v Regulatory Programs v NPDES Permits (Municipal, Industrial & Storm Water) v Waste Discharge Requirements (WDRs) v 401 Water Quality Certifications v Technical and Monitoring Report Requirements Phase II MS 4 SJR DO TMDL 22 Jan 2014 2

Impaired Reach of the San Joaquin River Disappointment Slough Turner Cut Impaired Reach Port of Stockton Phase II MS 4 SJR DO TMDL 22 Jan 2014 3

TMDL Source Area Impaired Reach of the DWSC DO TMDL Source Area Friant Dam San Joaquin River Phase II MS 4 SJR DO TMDL 22 Jan 2014 Mendota Pool 4

TMDL Sources v TMDL Studies - 3 Contributing Factors v Channel Geometry v Flow through the Channel v Upstream Oxygen Demanding Substances v City of Stockton WWTP discharges v Algae and nutrients from upstream watershed v Other upstream point sources (includes NPDES & Storm Water) Phase II MS 4 SJR DO TMDL 22 Jan 2014 5

TMDL & Control Program Actions v Contributors collectively responsible v Work together to implement TMDL v Actions Implemented within Watershed v Stockton WWTP upgrade v Aeration Facility operation v Watershed studies and new WDRs for Ag v Phase II MS 4 – TMDL Implementation v Minimize, control and prevent discharge v Annual Report submittal Phase II MS 4 SJR DO TMDL 22 Jan 2014 6