Three 55-gallon drums and several smaller containers of toxic chemicals were found dumped at an on-ramp of the San Diego Freeway and one Caltrans worker was treated for dizziness, authorities said. The drums were found along the National Boulevard on-ramp to the southbound San Diego Freeway, Los Angeles Fire Department spokesman Jim Wells said. One Caltrans worker who inhaled fumes from the barrels was taken to a nearby hospital after complaining of nausea and dizziness, Wells said. Firefighters said the barrels contained ethyl ether, sometimes used in the manufacture of the illicit drug PCP. A private chemical cleanup firm was called to remove the containers, Wells said.