Carlson’s job was demanding, but he enjoyed it. He cleaned out huge tanks that contained leaded gasoline, scraping them down by hand. He took samples from storage tanks whose vapors escaped with such force they sometimes blew his helmet off. He hoisted heavy loads and vacuumed up fuel spills deep enough to cause burns to his legs. Like many of the one thousand employees at the refinery, Carlson was often exposed to toxic substances. “He was practically swimming in those tanks,” his wife recalled. But Carlson never thought twice about the hazards. “I was a young guy,” he explained later. “They
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