Contamination from a diesel spill this past week when two semi-trucks collided near Wallula Junction was minor, officials said Wednesday.
Burns Oil of Oregon completed cleaning up the diesel, which spilled into a ditch along the highway, and filled two 55-gallon drums with soil, fill and rock, said Jani Gilbert, Department of Ecology spokeswoman.
Officials estimated just two gallons of diesel and two gallons of motor oil were found in the soil, she said.
"It didn't end up being quite as big as they thought," Gilbert said.
Around 200 gallons were estimated to have spilled in the crash, but Gilbert said the rest either dissipated or was cleaned off the highway.
The Feb. 24 crash occurred when the driver of an unloaded semi-truck tried to make a U-turn on the two-lane highway about five miles west of Wallula Junction and struck a semi carrying potatoes, spilling its load.