White smoke rises from the Chevron refinery during a controlled burn on Tuesday, Aug. 7, 2012, the morning after Monday's toxic fire in Richmond, Calif. An investigation into what caused the fire is ongoing. Heather Kulp, Chevron spokesperson, said the fire was caused by a vapor leak. (AP Photo/The Contra Costa Times, Laura A. Oda)
White smoke rises from the Chevron refinery during a controlled burn on Tuesday, Aug. 7, 2012, the morning after Monday's toxic fire in Richmond, Calif. An investigation into what caused the fire is ongoing. Heather Kulp, Chevron spokesperson, said the fire was caused by a vapor leak. (AP Photo/The Contra Costa Times, Laura A. Oda)
Heather Kulp, spokeswoman for Chevron, gives the latest update on the investigation into Monday's refinery fire, during a news conference outside the Chevron headquarters in Richmond, Calif , on Tuesday, Aug. 7, 2012. (AP Photo/The Contra Costa Times, Laura A. Oda)
SAN FRANCISCO (AP) ? A fire at one of the nation's largest oil refineries helped push West Coast gas prices close to $4 a gallon Thursday, as the same federal team that investigated the Gulf Coast spill waited to inspect the unit that was knocked out by the blaze.
The U.S. Chemical Safety Board team was standing by with state and company inspectors to do structural and environmental tests to see if it was safe to enter the unit and determine when production might resume after the Monday night blaze.
In all, five separate investigations will be done.
"This is an important accident in its own right, it was a large fire and has the potential to affect fuel supplies and prices," said Dr. Daniel Horowitz, a member of the chemical board.
The average price of regular gasoline jumped in California from $3.86 a gallon on Tuesday to $3.94 on Thursday, according to the website GasBuddy.com.
Some experts expect the disruption in production to last for weeks and push prices beyond $4 a gallon.
"It'll depend on Chevron getting their facility repaired," said Patrick DeHaan of GasBuddy.com. "The increases will be felt in California, Oregon and Washington, with perhaps some residual issues in Arizona and other nearby states."
The Richmond refinery produces 16 percent of the region's daily gasoline supply. The fire knocked out a unit that makes a specialized blend of cleaner burning gasoline that satisfies air quality laws in California, Oregon and Washington.
Sean Comey, a spokesman for Chevron, said myriad factors were pushing gas prices higher, not just the loss of one unit at the refinery.
"There are a variety of economic conditions like rising crude and ethanol costs, which also affect what consumers pay at the pump," he said.
Comey said the refinery continues to produce gasoline, diesel and jet fuel but in reduced amounts.
Experts said inventories of the cleaner burning gas already were low. With the refinery's output in question for what could be weeks, analysts say prices could reach $4 a gallon as soon as Friday.
"California has the cleanest burning gas in the nation, so this is definitely a market disruption," said Rayola Dougher, a senior economic adviser with the American Petroleum Institute.
California can't replace those supplies with imports from Washington state, Asia and the Gulf Coast, so it's more difficult to ease the impact of the lost production, Dougher said.
Some analysts believe other refineries in California could make up for the shortfall, if Chevron's capacity remains limited by the fire.
Tradition Energy analyst Addison Armstrong said California refineries have been producing about 6 million barrels a week, down from 7 million a week last month.
"That should be enough capacity to make up for the loss of output from Richmond," he said.
Comey said Chevron could not estimate when the damaged unit would be back online. The company also said it did not know when investigators would have access to the site.
Still, government investigators expected testing to be completed Friday.
Once the unit is open to inspectors, the process of determining the cause of the vapor leak that led to the towering fire can start. Then, after evidence is collected, Chevron can begin getting the unit back up and running.
Horowitz said investigators will also be evaluating Chevron's emergency response system and other concerns raised by the community.
Hundreds of people contacted attorneys and were expected to file claims against Chevron for breathing problems and other health issues stemming from the thick black smoke that spewed from the facility during the fire.
The company has set up a compensation funds and distributed phone numbers that can be used to file claims. The initial phone lines were overwhelmed by callers, and the company said it was arranging help to meet the demand.
The Bay Area Air Quality Management District originally said air samples taken during Monday's fire showed that toxic air contaminants were below levels considered unhealthy by federal officials.
The district said Thursday that its "initial statement was incorrect." In one of eight samples taken throughout Richmond, levels of the toxic compound acrolein were above the federal health standard.
Air district officials said the refinery fire generated smoke containing particulate matter that was the likely source of health complaints by Richmond residents.
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Associated Press Writers Sandy Shore in Denver and Terence Chea in San Francisco contributed to this report.
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