A local official in Santa Barbara, Calif., rejected Tuesday an emergency request by Exxon Mobil to use large trucks to haul its crude oil along a scenic highway until a pipeline that recently ruptured and caused a large spill is fixed.

"There is not adequate evidence that a defined emergency exists," said Dianne Black, the county's assistant director of planning and development. She was enlisted to make the decision after the county's planning director, Glenn Russell, recused himself since he recently owned stock in Exxon.

Exxon was the main customer of a pipeline owned by Plains All American Pipeline that burst three weeks ago due to corrosion, spilling 100,000 gallons of crude oil into the ocean and on beaches and killing wildlife.

Exxon was using the pipeline to haul some 30,000 barrels a day of crude oil, and is being forced to scale back production at offshore California fields as its storage facilities fill up. Last week it urged Santa Barbara to allow it temporarily use trucks to haul the oil to refineries in the region. It said trucks, each carrying some 6,700 gallons of crude oil, would make eight trips an hour, 24 hours a day, seven days a week, using Highway 101, until the pipeline is repaired and pumping resumes.

In Exxon's request for an emergency permit, it said it needed to maintain crude oil supply for California refineries so it could also maintain natural gas supplies to local utilities, providing energy to thousands of homes and businesses in the area.

In denying Exxon's request, Ms. Black also said that the request didn't fit the "comprehensive plan" of Santa Barbara county.

Environmentalist groups had urged Santa Barbara to reject the request, saying it might lead to another oil spill before the mess caused by the pipeline spill is even fully cleaned up.

Santa Barbara said Exxon could apply for a trucking permit through the normal, nonemergency process, although that process could take longer than it takes for the pipeline to return to service.

"We are disappointed in this decision, which we have not yet had the opportunity to study in detail," Richard D. Keil, an Exxon spokesman, said Tuesday. "We will explore all options before us going forward, and we will continue to focus on operating in a safe and responsible manner."

Write to Dan Molinski at Dan.Molinski@wsj.com

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