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HomeMy WebLinkAboutItem 9 PPP 09-09-2020 Administration Committee - Sewage Surveillance Project UpdateWastewater Surveillance for COVID-19 Presented by Lan Wiborg Director of Environmental Services Administration Committee September 9, 2020 1 Keeping up with the COVID-19 Headlines 9 days later, in a follow-up article 2 Wastewater Surveillance 3 Wastewater and SARS-CoV-2 Questions from Media/Public/Employees Is OCSD testing its sewage for SARS-CoV-2? Why? When will OCSD receive preliminary results? What can OCSD do with these results? Sewage surveillance for COVID-19 in OC? 4 Key Considerations Lessons from prior wastewater surveillance efforts Obtain expert advice Establish current and future use cases Sustainable field and laboratory resources Criteria for collaboration 5 Research Partners State Water Board •Add-on to DPR-2 project •Multi-benefit for water reuse agencies •No existing method University of Arizona •Extensive experience with SARS-CoV-1 •Existing method for wastewater matrix Stanford University •Innovation grant for method development •Nationwide recruitment of WWTPs 6 State Water Board DPR Research Projects Image Source: B. Pecson/Trussell Technologies, Inc. “DPR-2” 7 State Water Board: DPR-2 Method Development Detection and Quantification DPR Treatment Effectiveness Help to develop Direct Potable Reuse Criteria •Samples from five major CA POTWs •Sample collection since November 2019 •Added SARS-CoV-2 to study in April 2020 •Method optimization •Comparability assessment 8 DPR-2 Preliminary Data Image Source: B. Pecson/Trussell Technologies, Inc. 9 University of Arizona Detection and Quantification Viability WW Treatment Effectiveness 10 University of Arizona Image Source: University of Arizona/OCSD 11 Comparing Results Image Source: B. Pecson/Trussell Technologies, Inc.Image Source: University of Arizona/OCSD 12 Stanford University Method Development Detection and Quantification Data Management Data Modeling Samples from US WWTPs •25 CA WWTPs •24 WWTPs outside CA •Archived 1,700 samples to date •Analyzed 2 POTWs to date Image Source: A. Boehm/Stanford University 13 Stanford University Method Development •SARS-CoV-2 affinity for solids •qPCR vs. digital droplet PCR Image Source: A. Boehm/Stanford University 14 Stanford University Preliminary Results •Primary settled solids data •Tracking with confirmed clinical cases •Data analysis and modeling in progress Cannot Use to Predict Prevalence •Missing key variable –virus shed in feces •Prediction of COVID-19 unrealistically high Recommendations •PH information must guide sampling •Supply chain issues Image Source: A. Boehm/Stanford University 15 CDC Perspective •Sewage is an efficient pooled sample of community (or sub-community) infection prevalence •Captures sub-clinical infections •Independent of healthcare-seeking behavior and testing access •Data available within days of shedding onset versus up to 2-week lag for other data •Data collection at CDC to facilitate national disease surveillance interpretation and public health actions Information and mage Source: A. Kirby/CDC 16 National Wastewater Surveillance System Image Source: A. Kirby/CDC 17 CDC’s Role in NWSS Image Source: A. Kirby/CDC 18 Next Steps Sampling and Analytical Methods Sewer Dynamics Continue Coordination with OCHCA 19 Acknowledgements Technical Advisors Ian Pepper, PhD Director, WEST Center University of Arizona Charles Gerba, PhD Professor, Environmental Science University of Arizona Walter Betancourt, PhD Assoc. Research Professor, Env. Science University of Arizona Greg Kester, PE Director of Renewable Resources Programs CA Assoc. of Sanitation Agencies OCSD James Herberg, PE General Manager Ron Coss, MSPH, MPA, BCES Laboratory, Monitoring, and Compliance Manager Sam Choi, PhD Environmental Supervisor Roya Sohanaki, PE Engineering Manager Jennifer Cabral, MPA Administrative Services Manager Regional Advisors Haruna (Hana) Feldman, PhD, MPH Group Program ManagerData & Performance Analytics UnitChief Administrative Office County of San Diego Alissa Dratch, MPH Epidemiologist Communicable Disease Control Orange County Health Care Agency 20 Questions? 21