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VENTURA, Calif. — A firefighting engineer killed in the largest fire in California history was trapped by flames while he and his team tried to douse flare-ups above Fillmore.

That's according to a preliminary report recently released by the state agency. It details the chain of events from Dec. 14, when Cory Iverson, 32, died in the blaze. The report also lists safety issues for review.

Iverson, who had worked for the California Department of Forestry and Fire Protection (Cal Fire) since 2009, had responded to help battle the Ventura County blaze as part of a fire engine strike team out of the agency's San Diego unit.

The Thomas fire exploded in Ventura County about 6:30 p.m. PT Dec. 4 under extreme conditions. It burned quickly through dead and drought-stressed vegetation pushed by gusty Santa Ana winds and grew rapidly.

The fire, which has now burned 440 square miles in Ventura and Santa Barbara counties, has not yet been fully contained. Two people, a woman evacuating the fire and Iverson, died and 1,063 structures were destroyed.

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On Tuesday, at least 13 people were killed as mudslides swept through the area after heavy rains poured onto fire-damaged hillsides.

Early on Dec. 14, Iverson's team was working in steep, rugged terrain above Fillmore when the fire whipped up.

About 9 a.m., he and several firefighters were working along a line cut by two bulldozers when a spot fire flared in the area. 

Within minutes, the small fires were growing fast.

Four firefighters were able to retreat up an escape route and were uninjured, the preliminary report says. Iverson, however, became trapped while trying to put out the flames and was killed.

Autopsy results showed he died from burns and smoke inhalation. No other injuries were reported.

Authorities said the engineer's death warrants a "regular review" of the Foundations of Safety for Wildland Firefighting.

A Cal Fire spokesperson could not be reached Tuesday to answer questions about that process. 

The report also notes that extreme fire behavior has been observed on California wildfires, including the Thomas fire, due to critically dry brush that in many cases has found fire retardant to be "ineffective." 

The steep terrain, heavy vegetation and hazardous weather conditions such as erratic winds and low humidity — all which were present when Iverson died — contribute to that extreme fire behavior, the report states. 

"On December 2, 2017, the Oxnard office of the National Weather Service issued a red-flag warning for the Ventura County area, ending on December 15, 2017. In the days to follow, this would become the longest continuous red-flag warning ever issued in the state of California, lasting 13 days," according to the report. 

When fire activity changes and moves in an unexpected way it should require crews to pause and re-evaluate the situation, the report states. 

"One spot along the dozer line was safe enough to pick up. When there were spot fires that prevented safe travel back to the dozer line, a re-evaluation should have taken place," the report states. 

Before Iverson and the team began their 24-hour shift two safety briefings were held, according to the report. 

It was not known what was said at those meetings.

The crew was in the second half of their shift when Iverson became trapped. They worked from 10 a.m. to 10 p.m. on Dec. 13 mopping up flames that had gone over a fire line on a ridge southwest of an avocado orchard, the report states. 

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After that, they didn't find any other work in the area but remained there until about 3:30 a.m. Dec. 14. Then the wind picked up and they saw the glow of new spot fires , the report states. 

When Iverson and the four other firefighters in his strike team began working that day fire intensity was described as low and the upslope wind was pushing the smoke toward the west.

Two bulldozers were being used to cut a line near an avocado orchard in the area, and crews went in to lay hoses along the line.

They each carried 300 feet of hose. Iverson also carried a scraping tool. As they started, the fire backed up to the dozer line, the report says.

As they worked, spot fires flared up. One started burning in front of Iverson, and as he worked to put it out with a tool, a second one was reported nearby.

Iverson dropped some of the hose from his pack and went to put out the second spot fire. When he got there, it erupted. 

"At the same time, additional spot fires erupted along the dozer line west of the original spot fire," the report says.

With spot fires growing fast, firefighters' hoses did little to quell the flames. Iverson called in a request for air support. That was his last confirmed radio transmission, the report says.

By 9:25 a.m., a captain reported to Iverson that additional spots were burning below him. "He told (Iverson) to 'get out of there.'"

As the fire ramped up, four other firefighters dropped their hose packs and retreated along the dozer line. 

At 9:27 a.m., a captain called "mayday." More teams responded, including helicopters, which reported seeing Iverson retreating from the flames. But two spots erupted in his path, forcing him to switch direction.

Tall vegetation in the area reached as high as his chest and head in spots. At times, the report said only the top of his helmet could be seen.

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As crews tried to douse the flames by air, others tried to cool down a route for teams to search for Iverson. At 10:05 a.m., his body was found in a deep gulch south of his last known position, the report says.

Cal Fire personnel stayed with his body until it could be escorted from the scene.

A section of the report called Safety Issues for Review lists several common factors in fire fatalities, including that flare-ups occurred in deceptively light fuels and most of the fires "were innocent in appearance" before a blowup happened.

At the time of Iverson's death, Cal Fire Chief Ken Pimlott announced the fatality, saying little about the circumstances. Pimlott said a "serious accident review team" would investigate what happened.

Iverson is survived by his wife, Ashley, and 2-year-old daughter Evie. His wife is expecting their second daughter.

Follow Cheri Carlson on Twitter: @vcCheri

 

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