Section 303.312  Waters Receiving Fluorspar Mine Drainage

a)         The fluoride standard of Section 302.208 shall not apply to waters which:

1)         receive effluent from the mines and mills of the fluorspar mining and concentrating industry, and

2)         have been designated by the Illinois State Water Survey as streams which once in ten years have an average minimum seven day low flow of zero.

b)         Such waters shall meet the following standard with regard to fluoride: