By City News Service California Adopts Sweeping Plan To Combat Greenhouse Gas Emissions LOS ANGELES (CNS) - The Los Angeles Department of Water and Power pledged today to work to ensure early detection of future leaks after the South Coast Air Quality Management District issued the utility a notice of violation, alleging the utility's failure to properly maintain equipment at its Valley Generating Station in Sun Valley resulted in a methane leak detected last summer. The AQMD announced the notice of violation late Thursday, saying the agency learned on Aug. 26 of an ongoing methane leak at the natural gas-powered plant and conducted an on-site inspection of the DWP facility.