Porter Ranch residents who live near the Aliso Canyon gas storage field have long wanted to know what chemicals they ingested living next door to that long-lasting leak.
A deposition made public this week provides residents with new information about the level of cancer-causing benzene emitted from the ruptured gas well. Keep in mind, that leak went on for four months.
The documents came out as part of a massive, 48,000-plaintiff litigation against SoCal Gas. In public statements, SoCal Gas had said only "trace levels" of benzene came from the gas field during the blowout.
However, it was unclear to neighbors what that meant.
In a deposition taken by plaintiff's attorneys, a SoCal Gas engineer said that level was 1 to 9 parts per million. Why does that matter? Well, the state's threshold for exposure to benzene is far smaller, just one part per billion.
Read more about Aliso Canyon on LAist.com: Why The Aliso Canyon Gas Blowout Is Still In The News: Benzene
This story is part of Elemental: Covering Sustainability, a multimedia collaboration between Cronkite News, Arizona PBS, KJZZ, KPCC, Rocky Mountain PBS and PBS SoCal.