PIERRE, S.D. (AP) — South Dakota regulators are deciding whether to approve construction of a proposed $3.8 billion pipeline that would move oil from western North Dakota's Bakken oil patch.

South Dakota's Public Utilities Commission on Tuesday is beginning a two-week hearing on whether to permit the Dakota Access Pipeline, which would move at least 450,000 barrels of North Dakota crude daily through South Dakota and Iowa to an existing pipeline in Patoka, Illinois, where shippers can access Midwest and Gulf Coast markets.

About 270 miles of the 1,130-mile pipeline would be in eastern South Dakota, where some landowners have environmental concerns.

Opponents have placed seven billboards and signs throughout Lincoln and Minnehaha counties at locations under which the pipeline would run, in hopes of making the public aware of the pipeline's proximity to population centers and eastern South Dakota's productive cropland.

A march against the pipeline took place Saturday at a park in Sioux Falls, the Argus Leader newspaper reported (http://argusne.ws/1VlEyzk ).

"We really want people to be aware of what's going to happen with this pipeline hearing," said Peggy Hoogestraat, a landowner and vocal opponent of the project.

Dallas-based Energy Transfer Partners has said the project will create up to 12,000 temporary jobs for welders, mechanics, pipefitters and heavy equipment operators, pumping hundreds of millions of dollars into local economies. Construction companies in South Dakota have filed letters of support with the state.

The Public Utilities Commission will make a final decision on permitting by mid-December, Chairman Chris Nelson said.

The project also needs approval from regulators in North Dakota, Iowa and Illinois. Energy Transfer Partners already has the shipping commitments it needs from oil producers and hopes to have the pipeline running late next year.