The Seattle Fire Department ruled Wednesday that Tuesday night’s large barge fire on the Duwamish River was accidental and it estimated damage at $1 million. The barge was loaded with crushed cars — scrap metal — and fire officials did not say exactly how the fire began. The barge was moored in the 600 block of S. Myrtle Street in Seattle’s Georgetown neighborhood. The black plume of smoke from the blaze could be seen as far away as Tacoma. On Wednesday, Department of Ecology officers were checking the area for pollution. The DOE said they would check for oil or any other fuel that may have drained off the barge.