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EMC hears director recommendation to convert four IMAACs to groundwater standards; commissioners seek more site-specific data
Summary
DWR staff presented an information item recommending conversion of four IMAACs for herbicides and a fungicide into permanent groundwater standards or to allow them to expire; commissioners requested additional data on site prevalence, plume delineation, remediation options and program uses before deciding whether to pursue rulemaking in January.
The commission received an informational presentation from Bridget Shelton, Groundwater Standards Coordinator at the Division of Water Resources, about a director's recommendation to initiate rulemaking to establish groundwater standards in place of four interim maximum allowable concentrations (IMAACs) established in January 2024.
Shelton said the IMAAC mechanism allows the director to set a health-based protective level when no groundwater standard exists; the IMAACs at issue were requested by a petitioner (ELM Site Solutions) for an inactive hazardous site and…
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