AFL-CIO President Elizabeth Shuler called on Exxon Mobil Corp. to end a four-month lockout of workers at its Beaumont, Texas, refinery because of “potential safety risks,” according to a copy of a letter seen by Reuters.

Exxon Mobil locked out the plant’s hourly employees on May 1, saying it feared a strike following the expiration of a labor contract.

Shuler said Exxon Mobil’s use of temporary workers to run the refinery created the risk of an industrial accident. Temporary workers lack the experience and training of permanent employees, she wrote.

“We believe that the risk of an industrial accident at the Beaumont complex can best be mitigated by negotiating a mutually agreeable end to the lockout.”

Exxon Mobil spokeswoman Julie King rejected the concerns. “We continue to operate Beaumont safely and reliably with a highly competent staff of supervisors and engineers,” she said in an email.

Shuler’s letter to director Susan Avery, chair of the board’s public issues and contributions committee, was dated Aug. 30, the day Exxon Mobil rejected the last of three proposals made by United Steelworkers union (USW) local 12-243 last month to end the lockout.

“The USW has filed unfair labor practice charges with the National Labor Relations Board, alleging that Exxon Mobil illegally made unilateral changes to the continuing terms and conditions of employment and supported a union decertification campaign,” Shuler said.

The USW has said the company’s proposal would require its members give up long-standing seniority and would create a separate contract for workers in the lube oil plant from that of workers in the refinery.

Exxon Mobil has said the proposal would give it flexibility to be profitable in low-margin environments.

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