BN Builders and MacDonald-Miller have been sited for “serious” violations after two workers were burned in an explosion in June.

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Two construction companies involved in a Bellevue gas explosion that injured two workers have been cited for failing to take the proper steps to avoid a fire hazard.

Two plumbers were sent to the hospital June 18 after the explosion in a utility hole where they had been soldering.

The plumbers were treated for burns at Harborview Medical Center in Seattle and later released, hospital spokeswoman Susan Gregg said.

According to the state Department of Labor & Industries, the pair were installing a water pipe near a gas line that could not be removed.

“A positive means was not taken to protect” the gas line from heat and sparks, the citation says.

BN Builders, lead contractor on the building, and MacDonald-Miller, the subcontractor that employed the two plumbers, have been cited with “serious” violations and charged a total of $3,450.

MacDonald-Miller has appealed the citation and BN Builders has until Sept. 15 to decide whether it will also appeal.