Primary Copper Smelting: New Source Performance Standards
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These standards, which were promulgated on January 15, 1976, require new and modified Primary Copper Smelters to limit particulate matter emissions to 50 milligrams per dry standard cubic meter (mg/dscm), maintain opacity at or below 20%, and limit sulfur dioxide emissions in the gases released from the stacks (from roasters, smelting furnaces and copper converters) to 650 parts per million (or less) averaged over a 6 hour period.
01/15/1976 - Final rule.
10/16/1974 - Proposed rule.