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Napa Plant Site Restoration Project - South Unit Breach 2010 Water Quality Monitoring

This project details the successful salinity reduction efforts at the Napa Plant Site after three breaches in 2010. Water quality monitoring data including salinity, turbidity, pH, and more were collected, showing a gradual transition to ambient conditions. Challenges like monitoring scheduling and wildlife response were managed effectively.

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Napa Plant Site Restoration Project - South Unit Breach 2010 Water Quality Monitoring

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  1. NAPA PLANT SITE RESTORATION PROJECT SOUTH UNIT BREACH 2010 Water Quality Monitoring

  2. Three Breach Locations • 1st Breach CB8 • (Aug. 25, 2010) • (Sep. 7, 2010) • 2ND Breach “Y” • (Sep. 22, 2010) • 3rd Breach “Barge” • (Oct. 5, 2010)

  3. Photo Before Photo After Water Quality Monitoring South Unit Breach 2010

  4. Water Quality Collection • Out going tide, based on adjusted tide schedule of Brazos Bridge • 2 Hach Sondes- one was deployed to collect hourly readings of salinity.

  5. Water Quality Parameters Salinity Turbidity pH Dissolved Oxygen Specific Conductivity Temperature

  6. Water Quality Monitoring Plan Locations

  7. Salinity Reduction BreachCB8

  8. Salinity Reduction Breach at CB8 August 24, 2010- 1 day prior to breach August 25, 2010- day of breach

  9. Continuous Sonde at CB8 70-Ft 220-Ft

  10. Water Quality Monitoring Internal Units

  11. “Y” BreachSU-B3

  12. “Barge” BreachSU-CB2

  13. Overall the decrease in salinity followed the projected models, allowing the Napa Plant Site to gradually transition to ambient conditions (Napa River). This gradual process made the salinity reduction phase a success.

  14. There is still an existing salt crust inside the unit that appears to be slowly dissolving as expected.

  15. Turbidity

  16. Challenges • Complex monitoring schedule in conjunction with permit regulations and multiple breaches • Tide depth and time of sampling versus mudflats and boat access. • Continuous Sonde deployment issues

  17. Wildlife Response • Shorebirds • Salmonids and other fish species • Harbor seals • Waterfowl

  18. Questions? Thank you to GAIA, DFG, Cargill and DU for this great opportunity.

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