"Tesoro Corp. blocked the U.S. Chemical Safety Board from investigating an incident at a Northern California refinery and downplayed the extent of workers’ injuries, the board said."
"Tesoro, the U.S. West Coast’s largest refiner by capacity, refused to allow agency investigators to return to the site of a Feb. 12 chemical spill at the company’s Golden Eagle refinery in Martinez, the CSB said in a letter to Greg Goff, Tesoro’s chief executive officer. The company refused to preserve the accident site, prohibited certain interviews and indicated it wouldn’t comply with document requests.
Tesoro representatives didn’t immediately respond to requests for comment about the letter after normal business hours. The company said previously that it cooperated with CSB investigators."