 What is a TMDL?
 San Joaquin River DO TMDL Overview
 TMDL Control Program & Phase II MS4 Permit
Sue McConnell (Senior WRCE) (916) 464-4798
Christine Joab (Environmental Scientist) (916) 464-4655
Phase II MS4 SJR DO TMDL 22 Jan 2014
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 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 2014
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Disappointment Slough
Turner Cut
Impaired Reach
Port of
Stockton
R
S
F
Phase II MS4 SJR DO TMDL 22 Jan 2014
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Impaired Reach of the DWSC
DO TMDL Source Area
Friant
Dam
San Joaquin River
Mendota Pool
Phase II MS4 SJR DO TMDL 22 Jan 2014
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 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 2014
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 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 2014
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