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BILLINGS, Mont. — Exxon Mobil Co. reassured concerned regulators that an oil pipeline beneath Montana’s Yellowstone River was buried deeply enough and not in danger a month before it broke in a flood and spewed an estimated 1,000 barrels of crude into the waterway.
Details about the company’s actions leading up to the Friday-night spill into one of the West’s premier rivers emerged in federal safety documents as cleanup work continued downstream of the rupture site in the town of Laurel.
