The changes are proposed for wastewater discharges from mining and processing facilities that currently need an IDNR General Permit Number 5. The updated rules will keep mines and quarries in compliance with state water quality standards.
Most currently permitted facilities are eligible to use the general permit. However, they will have to submit results from water sample tests on sulfate in the future. The DNR may require an individual permit for facilities with high sulfate levels and those with new or expanded discharges to Outstanding Iowa Waters. The proposed changes would become effective in July 2011.
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