The Preferred Sands mine in Blair covers about 400 acres. A mudslide there in May flooded a neighbor's property, violating the company's storm water permit. The company also has had air-quality permit violations.
Nearly a fifth of Wisconsin's 70 active frac sand mines and processing plants were cited for environmental violations last year, as the industry continued to expand at a rapid clip.
Violations included air pollution, starting construction without permits, and an accident at the Preferred Sands mine in Trempealeau County where a mudslide during a heavy rainstorm damaged a neighboring property.
In addition, the state Department of Natural Resources cranked out letters of noncompliance - warnings to fix a problem before it becomes serious enough to merit a notice of violation - at ...