Press Release – Solano County Valero Flue Scrubber Report
Benicia, CA (April 1, 2019) – The City of Benicia has received an Incident Response Inspection Report from the Solano County Department of Resource Management related to the flue gas scrubber incident at Valero Benicia Refinery. A copy of the report is included with this press release.
On March 24, 2019 at approximately 7:00 a.m., the City of Benicia issued an advisory
notice for all residents with respiratory issues to stay inside due to particulate matter released by the Valero Benicia Refinery. The City actively monitored the air quality and incident response activities, and provided information to the public via media outlets including social media and Alert Solano.
Benicia Fire Department personnel continues to work closely with Solano County Environmental Health to monitor operations and potential impacts to the community.
Two Parts of Valero’s Benicia Refinery Under Scrutiny in Probe of Pollution Releases
By Ted Goldberg, Mar 29, 2019
A plume containing petroleum coke dusts wafts from a smokestack at Valero’s Benicia oil refinery on March 23. (Sasha Khokha/KQED)
Two key components at the Valero refinery in Benicia experienced problems earlier this month, leading to weeks of releases of petroleum coke dust that intensified on Sunday, culminating in the shutdown of a large portion of the facility.
The new details on the refinery’s malfunctions are laid out by Valero in a preliminary report filed with Benicia city officials this week.
The malfunctions are the focus of at least one part of an investigation by Solano County inspectors into an incident that led to health concerns for people living near the refinery and to a statewide spike in gasoline prices.
Valero’s report says that the recent problems at the refinery began March 11 when a crude oil processing unit called a fluid coker experienced “operating difficulty.”
Normally, a fluid coker heats up and “cracks” the thickest, heaviest components of crude oil processed at a refinery, breaking them down into material that can be used in diesel or other petroleum products. One of the byproducts of the process is solid carbon residue called petroleum coke.
The problems with Valero’s fluid coker unit allowed petroleum coke dust, called coke fines, to flow to a second unit called a flue gas scrubber. The scrubber cleans out fine particles before they’re released from the refinery’s smokestacks into the air. That process is supposed to ensure that the refinery’s emissions don’t violate air quality standards.
But the coke fines moving through the scrubber unit set the stage for a release of particulate pollution from the refinery — a release that was clearly visible from outside the facility.
“The presence of coke fines in the FGS resulted in a darker than normal plume appearance,” Valero’s 72-hour report said.
Solano County investigators want to know if the scrubber was somehow overwhelmed or damaged, according to Terry Schmidtbauer, the county’s director of resource management.
“We know something’s not operating properly,” Schmidtbauer said.
California’s Division of Occupational Safety and Health Cal/OSHA and the Bay Area Air Quality Management District are also investigating the refinery.
Refinery crews worked to reduce the releases and Valero said the situation showed “significant improvement” by last Friday, when the plume coming from the refinery’s stacks “returned to normal appearance,” Valero’s report said.
But that changed the next day. The scrubber “experienced an operational upset resulting in a dark, opaque plume and emissions of particulate matter,” the report said.
A new surge of petroleum coke dust billowing from the refinery’s stacks prompted Benicia officials to issue a health advisory, urging people with respiratory issues to stay indoors.
The refinery began to shut down several units, and the air district wound up issuing four more violation notices.
A plume containing petroleum coke dusts wafts from a smokestack at Valero’s Benicia oil refinery on March 23. (Sasha Khokha/KQED)
State workplace regulators, the region’s local air quality district and Solano County health officials are trying to find out why a problem at Valero’s Benicia refinery suddenly worsened over the weekend, leading to a release of petroleum coke dust that prompted fire officials to urge those with respiratory problems to stay indoors.
The incident led to a partial shutdown at the facility and represents the worst malfunction at the plant since a power outage caused a major pollution incident in 2017.
The releases of elevated levels of particulate matter led several residents to complain of breathing problems and prompted Benicia’s mayor to call on Valero to pay the city back for its work dealing with the emergency. The partial refinery shutdown is also expected to lead to a spike in higher gasoline prices throughout the state.
Mayor Elizabeth Patterson said she’s gotten a flood of phone calls and emails from residents wanting to know why it took so long for Valero to suspend refinery operations.
“There’s a lack of understanding about how coke particulates could be continuously emitted throughout a couple of weeks,” Patterson said. “There’s not a lot of information that’s readily available to the public.”
California’s Division of Occupational Safety and Health began a probe into Valero on Monday, the day after the company began the gradual shutdown of a significant portion of the refinery, according to agency spokesman Frank Polizzi.
Cal/OSHA becomes the latest government agency to look into the breakdown of a key piece of equipment inside the refinery that went down two weeks ago. The Bay Area Air Quality Management District and Solano County officials have launched probes as well.
Refinery Problems Started Two Weeks Ago
On March 11, the facility’s flue gas scrubber began malfunctioning. That meant the facility’s smokestacks began belching a sooty plume of petroleum coke dust — minute carbon particles that are a byproduct of the oil refining process.
The initial problem prompted the Bay Area Air Quality Management District to issue eight notices of violation against Valero.
The air district and Solano County health officials said during the following days that the flue gas scrubber had been fixed and the coke dust releases were intermittent and gradually coming to an end.
But the black smoke returned on Saturday. On Sunday, fire officials detected high levels of fine particulate matter, known as PM10, around the refinery and issued a health advisory urging people with respiratory issues to stay indoors.
“What we were seeing was dark gray, almost black smoke coming from the flue gas scrubber unit,” Benicia Fire Chief Josh Chadwick said Monday.
PM10 is particulate matter 10 micrometers or less in diameter — larger than PM2.5 many became familiar with during last November’s Camp Fire, when smoke from the huge Butte County blaze prompted health advisories throughout much of Northern California.
Like PM2.5, the larger particulate matter is regulated by the Environmental Protection Agency.
EPA spokeswoman Soledad Calvino said the agency would not comment on ongoing or potential investigations.
The agency has said that once inhaled, petroleum coke dust can affect the heart and lungs and cause serious health effects.
“The additional concern is that this is more toxic than the standard stuff you’d find in the atmosphere,” said Anthony Wexler, director of the Air Quality Research Center at UC Davis. “It’s probably similar in toxicity to diesel exhaust, which is a known carcinogen because it’s sooty in nature.”
On Sunday morning the wind in the Benicia area was blowing east to west at about 6 to 12 mph, according to meteorologist Jan Null.
That meant the coke dust was being blown toward residential neighborhoods, said Chadwick.
“That was one of the big concerns I had,” Chadwick said. “We had a wind shift … that really turned it back toward the city.”
Several Residents Complain of Breathing Problems
Chadwick said the Benicia Fire Department received two 911 calls for respiratory complaints. One of the calls was for one person who was transported to John Muir Medical Center in Concord. The other was for two people who told paramedics who showed up they didn’t need to be hospitalized.
The wind on Sunday also sent the coke dust toward parts of Contra Costa County, according to air district spokesman Ralph Borrmann. The agency received several complaints from people in Benicia and a few in Rodeo, Borrmann said.
Fire crews have been conducting air readings since Sunday morning and the levels of particulate are back to normal, Chadwick said.
Air district officials are expected to release the results of their testing later this week.
It’s unclear why the flue gas scrubber began malfunctioning again.
Terry Schmidtbauer, Solano County’s assistant director of resource management, said his department’s investigation is focused on the scrubber unit, other refinery components that interact with the device and if refinery workers made a mistake in operating the unit.
It’s also uncertain how long it will take to shut down the affected parts of the refinery and how long that closure will last.
“I am not sure how long Valero intends to have the affected portion shut down,” Schmidtbauer said in an email.
Lillian Riojas, a Valero spokeswoman, did not answer questions about how long the shutdown should last.
On Sunday the company issued a statement about the refinery problem.
“There may be a visible plume and flaring as part of the shutdown,” Valero’s statement said.
Mayor Renews Call for More Refinery Regulations
Mayor Patterson has been calling for more regulation of Valero’s facility ever since the May 5, 2017, refinery incident — a push that so far has failed to result in action.
The City Council rejected her proposal to develop an industrial safety ordinance, similar to one in Contra Costa County, that provides more information to town officials about refinery problems.
The latest incident has prompted her to renew her call for action.
“We definitely need an industrial safety ordinance with the fees to cover the costs that it’s costing the city,” Patterson said. “When we are responding to these things, that means we’re not doing something else.”
Patterson said she planned to bring up the issue of compensation at a City Council session this Saturday.
A Bay Area environmental group critical of the oil industry and the agencies regulating it said the episode should raise concern about operations at other facilities.
“This is the latest sign that Bay Area refineries and our air quality officials can’t safely cope with current workloads, let alone the increased volume of oil processing planned by the industry,” said Hollin Kretzmann, an Oakland-based lawyer for the Center for Biological Diversity.
After Weeks of Issues, Valero’s Benicia Refinery to Temporarily Shut Down
By Ted Goldberg, Michelle Wiley, Mar 24, 2019 11:30 a.m.Problems began at the refinery on March 11 when a malfunction involving one of the refinery’s units led to the release of petroleum coke dust. (Sasha Khokha/KQED)
The Valero refinery is performing a controlled shutdown to “improve conditions and minimize risk,” according to a statement from Benicia city officials. The shutdown could last multiple days and result in visible flaring.
Earlier Sunday, city officials issued an advisory notice for residents with respiratory issues to stay inside after a two-week-old problem at the Valero refinery worsened.
But now that the refinery is shutting down, city officials and Solano County health officer Bela Matyas says the air quality is safe for residents.
Valero Advisory Update – 10:30 a.m.
Benicia Fire Department continues to monitor air quality. Readings show that levels have significantly improved and are currently in the safe range. #ValeroScrubberIncident
Those problems eased after a few days but continued intermittently, air district officials said.
On Saturday several Benicia residents posted comments on the social media site, Nextdoor, expressing concerns about what appeared to be more black smoke coming from Valero’s stacks.
On Sunday, the particulate matter in the air increased.
This just got more serious. The @CityofBenicia has issued an advisory for all residents with respiratory issues to go inside because of the problems at @ValeroEnergy. ‘The concentration of particulate matter has become significantly higher over the past day.’ @KQEDnewshttps://t.co/cdDjTcV5x1
“The concentration of particulate matter has become significantly higher over the past day. The emissions contain coke, a by-product of the refining process that is made up primarily of carbon particles,” the city’s statement says.
Benicia officials said testing of the coke dust released so far did not show heavy metals at harmful levels but warned that breathing in air from the releases could worsen underlying respiratory conditions like asthma.
“Inspectors are on scene working with the facility and with Solano County and making a determination if additional violations will be coming,” said Lisa Fasano, a spokeswoman with the Bay Area Air Quality Management District.
The Air District also deployed a monitoring van to drive throughout Benicia to “gather ground level emissions data.”
Benicia, CA (April 1, 2019) – The City of Benicia has received an Incident Response Inspection Report from the Solano County Department of Resource Management related to the flue gas scrubber incident at Valero Benicia Refinery. A copy of the report is included with this press release.
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