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Residents urge county to press ADEQ after antimony, selenium exceedances tied to South32 discharge
Summary
Residents and local scientists told the Santa Cruz County Board of Supervisors that monitoring and reporting around South32's discharge have been inadequate, urging the county to press the Arizona Department of Environmental Quality to reopen the aquifer protection permit and require more frequent monitoring and independent review.
Residents and citizen scientists urged the Santa Cruz County Board of Supervisors to press state regulators after repeated antimony and selenium exceedances allegedly tied to a South32 discharge.
At the board's public-comment period, Hunter Williams read a prepared statement that said an antimony reading of about 12 parts per billion was found in a private well downstream and that selenium concentrations spiked to 7 parts per billion in December, above the quoted discharge limit of 2 ppb. Williams, reading a statement submitted for the record, said "the concentration of antimony . . . remains high above the drinking water standard" and urged the county to request that ADEQ reopen the aquifer…
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