Possible sinkhole threatens New Mexico town
A cavity left over from salt mining lurks underneath the busiest intersection in Carlsbad, N.M. A collapse could spell disaster for nearby residents and the city's economy.By Kate Linthicum
November 29, 2009
Reporting from Carlsbad, N.M. - Cookie and Ella Fletcher decided to call Thanksgiving off. This year, there seemed little to be thankful for.
Not far from the Fletchers' mobile home in this small southeastern New Mexico city lies a giant underground cavity that geologists say is a time bomb waiting to implode. At any moment, they say, the cavity could collapse into a yawning sinkhole, taking with it a chunk of highway, a church, several businesses and the El Dorado Estates trailer park the Fletchers call home.
The cavity is the result of three decades of salt mining, a process in which oil service companies inject water into a salt layer 450 feet underground, allow the water to dissolve the salt, and then suck up the brine. Oil companies use the brine to help extract oil from the earth. Over the years, more than 6 million cubic feet of brine was removed from the Carlsbad well and sold for use in the oil fields that blanket the surrounding desert.
State officials singled out the Carlsbad well as a danger and ordered it closed after two similar wells north of town collapsed last year, leaving craters about 400 feet across and 100 feet deep. Those sinkholes caused little damage because they occurred in rural areas -- in fact, sinkholes are not unheard of in oil country.
But the Carlsbad brine well is smack underneath the busiest intersection in this town of 26,000, and it is only footsteps from a major irrigation channel and railroad tracks. ...........(more)
The complete piece is at:
http://www.latimes.com/news/nation-and-world/la-na-sinkhole29-2009nov29,0,7271190.story 
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