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City report: three consecutive hexavalent‑chromium exceedances triggered South Coast AQMD action and NOVs to two foundries
Summary
Consultants told the City Council that three consecutive elevated hexavalent chromium samples at an industrial sampling site in Paramount triggered South Coast AQMD inspection and notices of violation to Feninco LLC and ProCast Industries; staff outlined follow‑up inspections, sampling reliability improvements and recommended wind‑monitor upgrades.
Randall Baxter, project manager for Trinity Consultants, told the Paramount City Council on Nov. 18 that the city’s six‑site hexavalent chromium monitoring network recorded three consecutive exceedances in August and September at the industrial sampler near 15701 Minnesota Avenue, which triggered South Coast Air Quality Management District (AQMD) action.
"If there's an elevated reading above 1 nanogram, it's considered it's above background levels," Baxter said, describing the network’s 24‑hour, 1‑in‑6‑day sampling schedule and the monitoring locations. He reported exceedances at the Minnesota Avenue site on Aug. 5 and three consecutive exceedances on Sept. 8, Sept. 15 and Sept. 22; Vermont Avenue also recorded an elevated reading on Sept. 15 and again in mid‑October.
Those three consecutive exceedances,…
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