For more than two months, methane has been escaping from a storage well in Los Angeles, causing the evacuation of thousands of homes…Now, residents are suing, alleging that Southern California Gas Company took out and never replaced a safety valve that could have shut off the leak, and generally failed to maintain the site.  The gas leaking from the Aliso Canyon Storage Facility has been treated with an odorant [which] has been reportedly causing headaches, nausea, nosebleeds, and other adverse reactions.  SoCalGas has temporarily relocated 2,300 households and is working with another 1,500 on relocations…The residents’ complaint alleges that the company identified leaks at the…site…five years ago — and the company even received a rate hike to pay for improvements, which it never implemented…The class action filing alleges that SoCalGas and its parent company “negligently failed to construct, operate, and maintain” the storage facility… “SoCalGas is committed to stopping the gas leak as quickly as possible,” [a spokesperson for the company] said. “To that end, we are creating a secondary relief well as backup to our ongoing drilling of the primary relief well.”...