The victim, identified as Gabriel Diaz-Cervantes, 45, of Calistoga, walked out the side door of an office building at the facility around 3:45 a.m. and fell in front of the tires of a 1984 Freightliner that was passing by at about 2 mph, CHP Officer Garrett Ray said.
The truck's driver, identified as Alan McClure, 58, of Napa, said he did not see Diaz-Cervantes, who also worked as a driver for the company, Ray said.
"Alcohol was not involved and it appears to be a tragic accident," Ray said. The private disposal and recycling facility is located at 1285 Whitehall Lane in Saint Helena. Ray said it is believed that Diaz-Cervantes had just clocked in to begin his workday when the incident happened.
Cal/OSHA is expected to investigate the incident, Ray said.