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Methane Plume: Leak Spreads Across LA's San Fernando Valley

Date: Tuesday, 19-Jan-2016 11:36:24

In Response To: For all the children who drowned and keep drowning in the Aegean Sea (IZAKOVIC)

By Phil McKenna, InsideClimate News

A data visualization shows the methane plume from the Aliso Canyon gas leak in northwestern Los Angeles.

More than 80,000 metric tons of methane gas have leaked from a storage site in northwestern Los Angeles, raising potential health concerns for people living in the area. Researchers are tracking its spread.

January 15, 2016 12:12 PM

Independent researchers reported detecting elevated methane levels as far as 8 miles from the massive, ongoing leak of natural gas from a storage site in northwestern Los Angeles. A ruptured well at Southern California Gas Co.'s Aliso Canyon underground facility has spewed more than 80,000 metric tons of methane into the atmosphere since the leak was discovered Oct. 23. The release of the powerful greenhouse gas led to the evacuation of thousands of people from the affluent Porter Ranch neighborhood a mile from the leak after reports by residents of nosebleeds, rashes, headaches and nausea.

Finding elevated methane levels well beyond the Porter Ranch area raises potential health concerns for people living outside the immediate vicinity of the leak, the researchers said. Inhaling low concentrations of methane, the primary component of natural gas, is generally not considered a health concern, but natural gas often contains trace amounts of other, more harmful gases.

"Whatever else may be in the gas-benzene, toluene, xylene -- that is what people may be breathing," said Nathan Phillips, an earth and environment professor at Boston University. "Even though we're not measuring things other than methane, there is a legitimate concern that there is that other nasty stuff in there."

The findings challenge assurances from the South Coast Air Quality Management District, the regional air pollution control agency, and the state's Office of Environmental Health Hazard Assessment that the leak hasn't increased residents' exposure to toxic gases.

The cumulative methane emissions from the Aliso Canyon facility to date have the greenhouse gas equivalent on the Earth's atmosphere of burning nearly 800 million gallons of gasoline, according to the Environmental Defense Fund.

On Wednesday, Los Angeles City Councilman Mitchell Englander called on SoCal Gas to extend its residential relocation program to residents of neighborhoods adjacent to Porter Ranch, according to the Los Angeles Daily News. People in these communities were also reporting similar symptoms related to the leaking gas, according to the paper. SoCal Gas spokeswoman Kristine Lloyd said the gas company is providing temporary accommodation and air filtration for residents within a five-mile radius of the leak, extending beyond Porter Ranch.

Democratic US Senators Barbara Boxer and Dianne Feinstein of California sent a letter to the Department of Transportation, the Environmental Protection Agency and the Department of Justice Wednesday calling on the federal agencies to offer further assistance to the State of California in responding to the gas leak.

In a mapping effort funded by the Home Energy Efficiency Team, a Cambridge, Mass., nonprofit, Phillips and Robert Ackley of Gas Safety Inc. measured methane emissions for the past several days near the Aliso Canyon leak. Gas Safety Inc. provides natural gas leak detection services to industry, businesses and homeowners.

They used a laser-based system mounted to a car. It recorded methane concentrations and plotted the readings on Google Earth. On Tuesday and Wednesday the researchers drove further from the leak and recorded methane concentrations as much as two times higher than background levels, as far as 8 miles away from the site.

Click to view a large version of the Google Earth data visualization, seen above.

"It's not just in Porter Ranch, it's going all the way across the (San Fernando) Valley," Ackley said of the methane plume. The valley is home to 1.8 million including Northridge, Winnetka and Woodland Hills, neighborhoods across the valley where the researchers confirmed increased methane concentrations.

California's Office of Environmental Health Hazard Assessment evaluated air samples collected by SoCal Gas in the Porter Ranch neighborhood between Nov. 1 and Jan. 9. The analysis included an assessment of benzene and other toxic chemicals and concluded that "available Porter Ranch neighborhood air sample data does not indicate that an acute toxicity health hazard exists in the Porter Ranch neighborhood as a result of the Aliso Canyon natural gas leak."

The agency said the symptoms reported by many Porter Ranch residents can be attributed to mercaptan, an odorant added to the otherwise odorless natural gas. Mercaptan smells like rotten eggs and helps in leak detection. "These odors can evoke physiological responses (e.g. nausea, headaches) without inducing more serious or longer-lasting health effects, such as eye, or respiratory system damage," the office said.

Independent scientists, however, questioned those findings. The "acute" guideline is "the most cautious interpretation you could take," Michael Jerrett, the chair of the UCLA Department of Environmental Health Sciences, told the Los Angeles Daily News. Acute guidelines focus on health effects from breathing significantly elevated levels of benzene over a short period but don't assess the health effects of inhaling lower levels over a longer time. "There's a potential here for health effects that could be experienced long term," Jerrett told the paper.

Phillips made the same point.

"We are going in for a half hour at a time to check out the plume, but if I had that as a constant condition in my place of work or home, I would definitely be concerned about it," Phillips said.

The Office of Environmental Health Hazard Assessment's analysis was based on measurements that were collected twice daily.

"One thing I was most struck by was the inadequacy of once or twice a day sampling stations," said Robert Jackson, an earth system science professor at Stanford University who joined Phillips and Ackley in taking methane readings over the weekend.

"There is an array of a dozen sampling stations that sample gases once or twice a day," Jackson said. "The area needs more real-time continuous sampling." There should also be additional sampling locations outside the Porter Ranch neighborhood, he said.

The South Coast Air Quality Management District has taken 24-hour readings on six days in Porter Ranch since Dec. 21.

"The benzene levels are actually on the low side of what we see typically in the LA area," said Sam Atwood, spokesman for the air quality district. "They were all 0.1 parts per billion with the exception of one, which was 0.2 parts per billion. Typically we would see anywhere from 0.1 to 0.5 parts per billion. That's good news. We're not seeing elevated levels, at least in these continuous 24-hour samples."

Phillips disputed the characterization of low levels of benzene and other toxic compounds.

"They are documented carcinogens," Phillips said. "You really can't say there is a safe level."


Methane is healthy.

This is why US is fracking the land on which it's population stands on.

Water strata beyond & above fracking structure?
Not of any importance.

Why is methane healthy?

Because it is much more efficient gas to keep down infrared Earths soil heat emissions to space then CO2. Since few years ago cows intestine were major producers of methane before US went fracking the soil on which its people lived for so long time.

S...t happens.

But there are positive moments:

We are facin a new ice age.

All Gore?

Just another scull less and bones idiot.
He did not get that he will never go on for ever because he promoted that planet heating by human mea culpa concept again.


Major sensless creature.


RMN is an RA production.

Articles In This Thread

For all the children who drowned and keep drowning in the Aegean Sea
IZAKOVIC -- Tuesday, 19-Jan-2016 10:17:21
Who is hunting Angela Merkel with 'rapefugee' hysteria? US network war against the German government
IZAKOVIC -- Tuesday, 19-Jan-2016 10:20:49
Stratfor Analysis: Poland
IZAKOVIC -- Tuesday, 19-Jan-2016 10:55:09
STRAIGHT TALK: Striking the Heart of Europe: Turkey's Failed Anti-Extremism Strategy
IZAKOVIC -- Tuesday, 19-Jan-2016 11:14:54
The Bold Attempt to Demystify Hitler's 'Mein Kampf'
IZAKOVIC -- Tuesday, 19-Jan-2016 11:19:01
Methane Plume: Leak Spreads Across LA's San Fernando Valley
IZAKOVIC -- Tuesday, 19-Jan-2016 11:36:24

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