On Monday, February 26, Anaplex Corporation was ordered by the South Coast Air Quality Management District (SCAQMD) to shut down all metal processing equipment and operations with the potential to emit hexavalent chromium after SCAQMD’s air monitoring data found levels of the compound above a trigger threshold of 1.0 nanograms per cubic meter (ng/m3). The facility was ordered to curtail operations by 4:30 p.m. on February 26.
The level is an average of three 24-hour samples collected over a period of about a week. The threshold, agreed to by Anaplex, was specified in an administrative order adopted by the independent SCAQMD Hearing Board in January 2017.
The following table shows recent levels of hexavalent chromium at a SCAQMD monitor just outside of Anaplex:
*Hexavalent chromium levels in nanograms/cubic meter, with background level of hexavalent chromium subtracted
Anaplex will not be able to resume operations of any equipment with the potential to emit hexavalent chromium until SCAQMD determines that the average of three most recent samples, collected over a period of about one week, is below the 1.0 ng/m3 threshold.
To view the latest monitoring results, please visit the SCAQMD’s website.