Crews from the Northridge Group, an environmental remediation firm from Northumberland, were at a site along Route 147 Thursday cleaning up 3,000 gallons of diesel fuel that were spilled when a fuel tanker truck overturned. They used excavators to dig up the soil and pump out the fuel. David Bogovich, president of the company, said an estimated 2,500 tons of soil were excavated through Thursday. Hydrocarbons are being trapped by an absorbant sock in the unnamed tributary of Shamokin Creek, he said, and soil and water samples are tested daily. Although snowfall earlier this week slowed progress, the project remains on schedule to be completed about two weeks from Monday.