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Jeffrey D. Allred, Deseret News
Chevron incident commander Patrick Green talks about efforts of crews as they continue cleanup and remediation activity in restoring the area impacted by a diesel spill at Willard Bay State Park on Wednesday, April 10, 2013.

WILLARD, Box Elder County — Cleanup of the March 18 oil spill at Willard Bay likely will take at least another month to complete, Chevron representatives said.

Crews at the cleanup site gave the media an up-close look at the operation Wednesday. There are still some 70 barrels of fuel out there and about 400 recovered.

The total spill volume is expected to be lower than original estimates because the forecast was based on limited data, according to the Willard Bay Unified Command, which is comprised of the Chevron Pipe Line Co., U.S. Environmental Protection Agency and Utah Division of Water Quality.

About 167 workers are at the incident site undertaking cleanup and restoration activities.

“Groundwater monitoring wells are being installed,” said Walt Baker, director of the Utah Division of Water Quality, “and we’ll be interested to see what the results of those are. We’re also looking at soils.”

Impacted soil and sand is also being excavated and replaced.

The spill is a result of a failure in an 8-inch pipeline buried in the wetlands at the state park outside of Willard, about 50 miles north of Salt Lake City.