4232678391 d0c920f379 o The first malfunction started at 11:45pm December 27th when a line that empties a tank, also known as a "liquid knockout drum," became clogged. KQED reports that the company has not disclosed what caused the clog and doesn't appear to be investigating the cause. The second incident, the result of an human error, occurred 16 hours later. A compressor that was restarted after a maintenance shutdown began malfunctioning because it had nothing to compress. The compressor was then shut down again for more than three days. Both occurrences activated the refinery’s flaring system . PG&E received 54 calls from San Francisco residents after the first incident, and 15 calls after the second. Most of the calls came from neighborhoods near the waterfront, including Bayview, the Marina, the Outer Sunset and Richmond, as well as SoMa. In a recent interview with KQED, Randy Sawyer, Contra Costa County’s chief environmental health and hazardous materials officer, noted that despite the reports, Chevron officials told his office that they are still investigating what caused the company's air monitors in Point Richmond to detect an "abnormally" high amount of hydrogen sulfide. Contra Costa County officials aren't the only ones investigating December's stink. In January, District 2 Supervisor Mark Farrell called for a series of hearings with Chevron executives. The Bay Area Air Quality Management District is also conducting its own investigation.

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