A continuous pressure monitoring system waits to be installed on a gas well at the Southern California Gas Company's Aliso Canyon storage facility near the Porter Ranch neighborhood of Los Angeles, Thursday, Jan. 12, 2017. The company is trying to resume operations at the site, but must pass a battery of tests ordered by state regulators after the leak that was capped last year forced more than 8,000 families to relocate amid complaints of headaches, nausea and nose bleeds. (AP Photo/Jae C. Hong)
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