SAN FRANCISCO — Chevron was fined nearly $1 million by the state on Wednesday in connection with a fire at the company's San Francisco Bay Area refinery last year that sent a cloud of gas and black smoke over residential areas.

Investigators found "willful violations" in Chevron Corp.'s response before, during and after the Aug. 6 fire in Richmond caused by an old, leaky pipe in one of the facility's crude units, said Ellen Widess, chief of the California Division of Occupational Safety and Health.

"Our ... investigation showed that Chevron had repeated warnings and recommendations from its own metallurgists and pipe inspectors about the condition of this pipe," Widess said.

"Chevron was in a unique position to really know the hazards that they deal with from their dynamic technologies and processes, many of which are proprietary. They alone were in position to have addressed these hazards."

The agency filed 25 citations against the oil giant, and said the $963,200 in fines were the largest allowed by state law. The company said it planned to appeal some of the violations.

Among the findings, the agency said the company didn't follow recommendations of its own inspectors and scientists made in 2002 to replace the corroded pipe that ultimately ruptured and caused the fire.

"Chevron had pervasive violations in its leak repair procedures throughout the refinery," the agency found. "Investigators identified leaks in pipes that Chevron had clamped as a temporary fix. In some cases, the clamps remained in place for years, rather than replacing the pipes themselves."

Cal-OSHA also cited Chevron for not following its own emergency shutdown procedures when the leak was first spotted, and said the company exposed workers to harm by not ensuring they wore proper safety equipment when going back into the burnt-out crude unit after the blaze.

No workers were seriously injured in the incident.

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Eleven of the violations have been classified as "willful" because investigators found that Chevron had not taken actions to eliminate dangerous conditions for employees, including replacement of the pipe that ruptured.

Company spokesman Sean Comey said Chevron disagreed with some of the violations.

"Although we acknowledge that we failed to live up to our own expectations in this incident, we do not agree with several of the (Cal-OSHA) findings and its characterization of some of the alleged violations as 'willful,' " he said in an email. "Chevron intends to appeal."