Contra Costa Health Services continues to advise Crockett residents to protect their health due to elevated levels of hydrogen sulfide coming from the Crockett Wastewater Treatment Plant.
Air monitoring data on Monday and Tuesday from the county's Hazardous Materials Program show concentrations of the chemical that can cause headaches, nausea and irritated eyes over long periods.
A team on Tuesday collected a one-hour average reading of .045 ppm near Port and Ceres streets, directly east of Interstate Highway 80 from the plant. Inframark said in a statement Wednesday it will complete cleaning of more than 1,300 air diffusers in one of three wastewater treatment reactors by the end of Wednesday. The diffusers provide oxygen needed by microorganisms in the wastewater that break down sewage.
Inframark said it expects the odor to cease within seven to 10 days as microorganisms have time to digest. Residents should notice odors dissipating sooner. The Contra Costa County Office of Emergency Services and the Hazardous Materials Program provided 40 indoor air filters to John Swett High and Carquinez Middle schools. On Tuesday, hazardous materials crews measured a one-hour average reading of .0031 ppm outdoors at John Swett High, and .0015 ppm outdoors at Carquinez Middle.
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