By ELIOT CAROOM
SAN ANTONIO (Bloomberg) -- A Tesoro line in
North Dakota that carries oil from the Bakken shale formation
to a rail operation leaked about 20,000 bbls of crude near
Tioga, in the northern part of the state.
Tesoro shut the segment involved and repairs were under way,
the company said in a statement. Most of the regions oil
production, or about 67% in July, is exported by rail, with 25%
sent by pipe and 7% used at Tesoros Mandan, North Dakota,
refinery, according to the state
The state was notified of the spill on September 30, and the
initial estimate of the amount released was 750 bbls, said Dave
Glatt, chief of environmental health for North Dakota. He said
the extent of the 7.3 acre spill was discovered later because
much of the oil is below the surface, permeating the soil to a
layer of clay 10 to 12 ft underground.
The line carried domestic crude to a rail site at
Battleview, Maxine Herr, a spokeswoman for the state Mineral
Resources Department in Bismarck, said by phone.
The spill is the second-largest in state history, Glatt
said. The date of the release wasnt known.
Its probably something thats been going on
for a little bit of a time, we just dont know how
long, Glatt said. Due to the extent of what
happened, what kind of leak was it and what kind of safeguards
in place do they have to detect these things, that will be part
of the investigation.