San Joaquin River Dissolved Oxygen TMDL - Implementation Activities
Port of Stockton Dock 20 Aeration Facility
The Port of Stockton owns the aeration device that was constructed at Dock 20 on the Port’s West End Complex. The Dock 20 Aeration Facility is funded under a voluntary aeration agreement among participating San Joaquin River DO TMDL stakeholders. The facility injects dissolved oxygen into the San Joaquin River when dissolved oxygen concentrations are less than the Central Valley Water Board’s Basin Plan dissolved oxygen water quality objectives. Below are the following documents - the current aeration agreement and the annual operations, maintenance and cost summaries for the Dock 20 facility.
- 2016 Amended Agreement for Funding & Operation of Dissolved Oxygen Aeration Facility, 139 KB, PDF (PDF info)
- 2012 Agreement for Funding & Operation of Dissolved Oxygen Aeration Facility, 3.38 MB*, PDF (PDF info)
- 2016 Port of Stockton Aerator Operations, Maintenance, and Cost Summary, 2.42 MB*, PDF (PDF info)
- 2015 Port of Stockton Aerator Operations, Maintenance, and Cost Summary, 3.52 MB*, PDF (PDF info)
- 2014 Port of Stockton Aerator Operations, Maintenance, and Cost Summary, 472 KB, PDF (PDF info)
- 2013 Port of Stockton Aerator Operations, Maintenance, and Cost Summary, 281 KB, PDF (PDF info)
- 2012 Port of Stockton Aerator Operations, Maintenance, and Cost Summary, 266 KB, PDF (PDF info)
- 2012 Port of Stockton Aerator Operations, Maintenance, and Cost Summary Addendum, 181 KB, PDF (PDF info)
The Aeration Facility was constructed by the Department of Water Resources in 2006-2007 and was demonstrated during a multi-year study of the effectiveness of elevating dissolved oxygen concentrations in the channel through the use of an in-channel aerator. More information on DWR’s Stockton Deep Water Ship Channel Demonstration Dissolved Oxygen Project can be found on their website below.
- Department of Water Resources Stockton DWSC Demonstration Dissolved Oxygen Project
Continuous dissolved oxygen readings in the DWSC can be obtained from the California Data Exchange Center (CDEC).
Port of Stockton - Dredging and Mitigation Aeration Requirements
The Port of Stockton performs maintenance dredging of the berths at the Port, and is required to provide aeration as a mitigation measure.
Source Control – Point and Nonpoint Sources
The primary point source of oxygen demanding substances contributing to the DO impairment is from the City of Stockton Regional Wastewater Control Facility. Other municipal wastewater treatment plants in the SJR watershed may also have the potential to contribute oxygen demanding substances or their precursors. These may include, but are not limited to, the City of Manteca, City of Tracy, City of Modesto and the City of Turlock.
For the purpose of the Control Program, nonpoint source discharges are discharges from irrigated lands – lands where water is applied for producing crops, and includes, but is not limited to, land planted to row, field and tree crops, as well as commercial nurseries, nursery stock production, managed wetlands and rice production.
U.S. Army Corps of Engineers
The U.S. Army Corps of Engineers is responsible for any channel deepening or maintenance dredging in the Stockton Deep Water Ship Channel. The TMDL’s Control Program required the Army Corps to submit a technical report identifying and quantifying the various mechanisms by which oxygen demanding substances are converted to oxygen demand and the impact that the Stockton DWSC has on re-aeration and other mechanisms that affect DO concentration in the water column.
- October 1988 Document:
Effects of the Stockton Ship Channel Deepening on Dissolved Oxygen Near the Port of Stockton, California (Phase II), 1.17 MB*, PDF (PDF info)
- November 1988 Document:
Dissolved Oxygen Study, Stockton Deep Water Ship Channel, 1.48 MB*, PDF (PDF info)
- May 1990 Document:
Finding of No Significant Impact (FONSI) San Francisco Bay to Stockton Ship Channel: Dissolved Oxygen Mitigation Implementation, 451 KB, PDF (PDF info)
- November 1988 Bibliography Document:
Dissolved Oxygen Bibliography Referred to in the USACE Office Report Entitled “Dissolved Oxygen Study” dated November 1988, 58 KB, PDF (PDF info)
- March 1972 Document:
City of Stockton Environmental Impact Statement Main Water Quality Control Plant, 1.89 MB*, PDF (PDF info)
- May 1985 Document:
Effects of the Stockton Ship Channel Deepening on the Hydraulics and Water Quality Near the Port of Stockton, California, 2.01 MB*, PDF (PDF info)
- March 1986 Document:
Users Guide for the Stockton Ship Channel Project Link-Node Hydrodynamics and Water Quality Models, 5.27 MB*, PDF (PDF info)
- 1972 Document:
Old River Closure Summary Report – 1972, 207 KB, PDF (PDF info)
- 1974 Document:
Old River Closure Summary Report – 1974, 351 KB, PDF (PDF info)
- 1981 Document:
Old River Closure Summary Report – 1981, 328 KB, PDF (PDF info)
- February 1985 Document:
Summary of Water Quality Monitoring During 1984 Old River Closure, 162 KB, PDF (PDF info)
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