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** MANDATORY CREDIT ** The release of flammable vapor leads to a fire at the Chevron refinery in Richmond, Calif., on Monday, Aug. 6, 2012. (Fototaker.net via Chemical Safety Board)

Bay Area gasoline prices have soared nearly 9 percent in the one month since the disastrous fire at Chevron's mammoth refinery in Richmond -- but they have hardly changed in the last week.

Prices for unleaded gasoline averaged $4.19 a gallon in the Bay Area on Tuesday, according to information compiled from the GasBuddy online site. That's 34 cents, or 8.7 percent higher than the $3.82 average the night of the Aug. 6 fire at the refinery owned and operated by San Ramon-based Chevron.

On Tuesday, the average price of gasoline was $4.16 in the East Bay, $4.18 in the South Bay and $4.23 in the San Francisco metro area, GasBuddy reported.

Late Tuesday, the highest price for gasoline in the Bay Area was $4.99 at a San Bruno 76 station at the corner of East San Bruno Avenue and 6th Avenue.

The lowest reported price in the Bay Area was $3.95 at four gas stations, including two in Fremont and one each in El Sobrante and Richmond.

Contact George Avalos at 925-977-8477. Follow him at twitter.com/george_avalos.