On February 5th, 2019, the South Coast Air Quality Management District (SCAQMD) held Working Group Meeting #4 for their Proposed Rule 1480: Air Toxic Metals Monitoring. Under the proposed rule, SCAQMD would require ambient monitoring of toxic metals concentrations near certain facilities with metals emissions, including facilities with metal finishing, heat treating, forging, shredding, melting, and grinding operations. If ambient monitoring detects elevated concentrations of metals that result in significant health risks, the facility may be pushed into the Assembly Bill (AB) 2588 and Rule 1402 process for assessment of toxic emissions and associated health risks. The proposed Rule 1480 process is summarized below:
Under the currently proposed framework, facilities pulled into the Rule 1480 monitoring program would be required to develop a monitoring program, which would identify the location of at least one upwind monitor and one downwind monitor. Monitoring would be required once every three days, and sampling would be performed over a 24-hour period. In addition, facilities would be required to install and operate an on-site weather station, collect and maintain monitoring and weather data, and notify SCAQMD of any equipment malfunctions.
Rule 1480 monitoring would result in significant capital and operation and maintenance (O&M) expense. While the rule is still in development, facilities should develop and implement work practices that minimize fugitive emissions. This will in turn minimize the ambient concentrations of toxic metals at off-site monitoring locations and reduce the chances of a facility being identified as a Potentially Significant Source.
The next Working Group meeting is scheduled for March 2019, and the rule is tentatively set to go in front of the SCAQMD Governing Board in the third quarter of 2019.
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