Committee to analyze long-term chloride trends and potential drivers
County staff said the grant will fund analysis of historic groundwater quality for Group A and B systems, Lopez Island monitoring data, and comparisons with precipitation and Pacific Decadal Oscillation indices to identify likely causes of rising chloride concentrations.
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San Juan County staff told the groundwater subcommittee the grant includes a focused task to analyze historic groundwater quality and identify trends in chloride concentrations across monitoring networks and public systems. "Over the life of the monitoring network, there are observable increases in chloride concentrations across the network," Ethan Schmidt said, and the analysis will evaluate multiple possible causes rather than assuming a single factor.
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