Crews are working to remove contaminated soil and groundwater after a train derailed last week in Washington state.

Workers in Skagit County replaced diesel-contaminated dirt with backfill, and worked on repairing the railroad bed on the Swinomish Reservation. The progress comes within days of two BNSF locomotives derailing near Anacortes and spilling more than 3,000 gallons of diesel, officials estimated.

“They’re already going to town digging, several dump trucks, couple trailers hauling this stuff out,” said Dustin Pruitt of Snohomish who’s camping in his RV near the site of the train derailment.

“They’ve been doing really well. They’ve been working 24 hours a day out here cleaning up,” added camper William Craig, of Mt. Vernon.

Craig is camping nearby with his wife and dog Fiona. They say the derailment woke them up just after midnight Thursday.

“It wasn’t real loud. It shook the ground like an earthquake,” he said.

They’re grateful that no spilled diesel reached the shoreline of the bay or impacted wildlife.

Crews removed about 2,100 cubic yards of contaminated soil and 4,300 gallons of groundwater. Officials say the groundwater contained fewer than 50 gallons of diesel fuel.

We installed groundwater monitoring wells, called sparging units, which will get rid of any remaining diesel fuel product that might be remaining in some of the soil,” EPA spokesperson Bill Dunbar said.

The EPA is the federal lead for the cleanup and adds that this incident was a learning experience for all responding agencies.

I think we dodged a bullet here. This could have been much, much worse. This could have been a disaster. There could have been a number of trains filled with petroleum that spilled,” Dunbar said.

BNSF is footing the bill for this response. It’s unclear when the rail line will be back in operation.

At last check, investigators are still looking into what caused the two engines to derail.