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David Gonzalez California Department of Water Resources Division of Environmental Services

Real Time Monitoring – The Installation and Continuous Operation of Organic Carbon and Liquid Chromatography Analyzers at Remote Field Stations in the Sacramento – San Joaquin Delta. David Gonzalez California Department of Water Resources Division of Environmental Services

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David Gonzalez California Department of Water Resources Division of Environmental Services

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  1. Real Time Monitoring – The Installation and Continuous Operation of Organic Carbon and Liquid Chromatography Analyzers at Remote Field Stations in the Sacramento – San Joaquin Delta David Gonzalez California Department of Water Resources Division of Environmental Services Municipal Water Quality Investigations Field Support Unit

  2. Drinking Water and Organic Carbon – What are some of the Issues? • Organic carbon reacts with chlorine during disinfection to form suspected carcinogenic compounds such as trihalomethanes and haloacetic acids. • The majority of Delta islands are composed of peat soils rich in organic carbon. • The complex Delta system makes it difficult to assess the relative carbon contributions from riverine inputs and in-Delta sources, and to develop accurate models of water quality fluctuations in the Delta.

  3. Real Time Monitoring Stations Hood Station Banks Station McCune Station

  4. Real Time Monitoring of Organic Carbon with a Dedicated Field Analyzer – Feasibility Study The MWQI Field Unit conducted a feasibility study in 1999 – 2000 to evaluate the performance of a Sievers 800 UV/Oxidation based carbon analyzer installed in a field station on the Sacramento River.

  5. We learned what is needed to make the system work and provide representative data • Secure location with accessibility, power, and phone service • Water delivery system including pump and water lines • Water flow control and flow diversion system • Water Sampling ports • Data Logger communication • Develop SOP’s and a QA/QC plan

  6. The Next Phase: The Installation of a Shimadzu 4100 TOC analyzer at Banks Headworks • Shimadzu 4100 is a catalyzed combustion based analyzer. • Dual stream – can do both Total Organic and Dissolved Organic Carbon • Filtration system required for DOC analysis • Pressurized air supply required

  7. Datalogger Phone Modem TOC Analyzer FTP DWR Access Database California Data QA/QC Data Exchange World Wide Web Data System

  8. A Shimadzu 4100 unit was installed at Hood facility in April 2002 • The only station with both UV/oxidation and catalyzed combustion based analyzers.

  9. Sievers 900 TOC analyzer installed in May 2005 • Touch screen programming • Integrated on-line sampling system • Integrated inorganic carbon removal unit • USB port for data transfer • Increased rate of analysis

  10. The Next Step - The addition of a Dionex DX-800 Ion Chromatography Analyzer at the Banks station for anion analysis Parameters of Interest - Chloride – Trihalomethane Formation Potential Bromide - Trihalomethane Formation Potential Nitrate – Nutrient loading Sulfate – Drinking water regulatory standards

  11. The Anion Analyzers Operational Requirements: • Need supply of both pressurize nitrogen and clean air. • T1 line needed for remote operation of analyzer’s computer. • Sample stream must be filtered to 0.45m. • Requires 18 M DI Water

  12. New building needed to house anion and carbon analyzers

  13. The New System

  14. Required Components

  15. Our newest facility: The San Joaquin River McCune Station near Vernalis

  16. New Analyzers

  17. Dionex system and Pump float components

  18. TOC/DOC Daily Average Comparison

  19. Organic Carbon concentration and its relation to flow in the San Joaquin River near Vernalis

  20. Sievers/Shimadzu Daily TOC Averages on the Sacramento River at Hood

  21. Banks Headworks: Online vs. Grab TOC Samples – Relative Percent Difference

  22. Banks Headworks: Online vs. Grab DOC Samples – Relative Percent Difference

  23. chloride Bromide Sulfate Nitrate

  24. In Conclusion • Continual operation of remotely installed organic carbon analyzers is achievable. • With proper maintenance, servicing, and operation these systems produce representative data . • Remote analyzers can be very labor intensive at times and require frequent monitoring of operational status • The remote operation of anion analyzers has a steep learning curve. • Still developing operational procedures and techniques for anion units that work in field setting.

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