FILE - In this Oct. 29, 2009, file photo, a defunct brine well operation once owned by I&W Trucking in Carlsbad, N.M., is fenced off because state officials fear a cavern that has formed under the site as a result of nearly 30 years of brine production is at risk of collapsing. Almost half of Carlsbad school bus routes travel over the well, on a busy road that borders a giant, underground cavern that resulted from years of manufacturing brine for the oil and gas industry. It's been nearly nine years since state officials first sounded the alarm about a potential collapse, but experts said could happen at any time. (AP Photo/Susan Montoya Bryan, File)
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