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Columbia Gas, the utility company involved in last month’s explosions and fires in three Massachusetts towns, said it replaced nearly 36 miles of main pipeline in the region after an overpressure incident blew gas lines in three towns leaving one dead and 25 injured.

That means Columbia Gas is 80 percent through its work to replace 45 miles of main pipeline, and about halfway through its work replacing 6,100 service lines to homes and businesses.

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The company said 151 construction crews are expected to continue work in Lawrence, Andover and North Andover, MA.

The Sept. 13 explosions and fires killed a teenager and injured at least 25 other people.

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The blasts occurred after natural gas lines became overpressurized when Columbia Gas failed to account for critical pressure sensors as workers replaced century-old cast-iron pipes in Lawrence, Federal authorities said.

The company said to date it has paid $23 million in claims from customers.

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