Dominguez Channel odor continues waning, investigation includes illicit dumping, officials say – Daily News
Los Angeles County’s Department of Public Works has made significant progress in reducing the odor coming from the Dominguez Channel that has plagued Carson residents and those in nearby cities for nearly a month, officials said Wednesday, Oct. 27, while confirming for the first time that their ongoing investigation is looking into whether chemicals from local refineries, chemical plants and other facilities are partially responsible for the stench.
Public Works Director Mark Pestrella and other officials provided those updates during the county’s second virtual town hall on what they have dubbed the Dominguez Channel Odor Incident.
“Our water sampling tells us our efforts are working,” Pestrella said. “So we’re ramping up and making good, good progress in seeing a downtrend in the hydrogen sulfide that’s creating this odor you’re all experiencing.”
The Public Works Department, which oversees around 483 miles of open channel and has taken responsibility for the odor, has continued to treat the channel water with a non-toxic and biodegradable odor neutralizer called Epoleon.
Crews had removed the 12 nano-bubblers used to pump oxygen back into the water ahead of the rain on Monday, but quickly reinstalled them on Tuesday. High-intensity lights are also planned to be installed to eliminate photosensitive bacteria believed to be contributing to the odor.
Pestrella has said the cause of the odor is decaying vegetation, which he has described as a naturally occurring phenomenon. But what’s different about this event, he said Wednesday, is that “we’ve had a more extended and persistent release of hydrogen sulfide than we have ever experienced.”
A survey of similar incidents nationwide showed such occurrences are not out of the ordinary, Pestrella said, but its duration is still troubling.
His department, Pestrella said, is also continuing to investigate incidents of illicit chemical dumping in the channel that could have acted as a catalyst in the process of the decaying vegetation, which is responsible for the gas release. The investigation, Pestrella said for the first time Wednesday, includes local refineries, chemical plants and facilities, and other sites adjacent to the channel, based on the theory that “something was shaken loose by the earthquake.”
He was referring to the magnitude 4.3 earthquake near Carson that shook much of the county last month.
“We’re attempting to rule out as many things as we can,” Pestrella said, “and will continue to do so until the end of this incident.”
Terrance Mann, deputy executive officer with South Coast Air Quality Management District, said his department continues to be fully deployed in the field and is using all the tools at its disposal. Those tools include mobile monitors, air sampling and the agency’s fixed air monitoring network, which is spread throughout LA County.
The agency also recently installed an additional monitor along Chico and 213th streets, making it the monitor closest to the channel.
“That water,” Mann said, “continues to show elevated levels of hydrogen sulfide in the middle of the night and the early hours of the morning.”
That coincides with when residents say the smell is most potent.
Denial of responsibility! Swiftheadline is an automatic aggregator around the global media. All the content are available free on Internet. We have just arranged it in one platform for educational purpose only. In each content, the hyperlink to the primary source is specified. All trademarks belong to their rightful owners, all materials to their authors. If you are the owner of the content and do not want us to publish your materials on our website, please contact us by email – email@example.com. The content will be deleted within 24 hours.