Several agencies were on the UC Berkeley campus Sunday assessing how much damage was done when 1,711 gallons of diesel fuel spilled from an underground tank Saturday night, with some of the fuel washing into Strawberry Creek and possibly beyond.

"No fuel has reached San Francisco Bay or the Berkeley Marina," said Mary Simms, a regional spokeswoman for the U.S. Environmental Protection Agency.

Cleanup crews were busy Sunday mopping up Stanley Hall, a science building where most of the fuel spilled sometime around 7 p.m., as well as along the creek and the surrounding area, environmental officials said.

The leak was contained by 9 p.m. Saturday, but Stanley Hall remains closed. Campus officials hope to have the spill cleaned up by today, the first day of final exams at the university.

Authorities were trying to determine how much fuel had entered Strawberry Creek, which runs underground in places.

"It's too early to assess how much fuel spilled" into the creek, said Janet Gilmore, a campus spokeswoman.

Simms said a Good Samaritan had constructed a barrier along the creek after the spill, allowing 20 gallons of fuel to be recovered from that site.

The spill occurred when an underground diesel fuel tank that is fed by a larger nearby storage tank overflowed, campus and environmental officials said. The fuel powers an emergency generator for Stanley Hall. Authorities are trying to determine why the tank overflowed.

The spilled fuel got into the building's sump pumps, which flushed it into storm drains and eventually into the creek.

The Environmental Protection Agency, the U.S. Coast Guard, the California Department of Fish and Game and the city of Berkeley, as well as campus environmental officers, were monitoring the situation.

No injuries have been reported, nor has any damage to wildlife. Signs are being posted around Strawberry Creek warning of the spill.