Officials are testing wells on private property after the chemicals turned up unexpectedly in a 3M company landfill in Woodbury.

The retailer is testing a new checkout system at one of its Minneapolis stores. But so far not so good, according to a report in MinnPost. Under the new system, customers line up in a single-file queue, then wait for the system to announce the next open cashier.

The advisory warning residents of West St. Paul against drinking tap water from the city system was lifted Wednesday after tests revealed no harmful bacteria in the system. The advisory was issued Tuesday after a power outage caused by early-morning storms dropped pressure to a level low enough to allow the intrusion of bacteria.

Electromagnetic interference from wind farms can disrupt the radar systems used by airports and the military. An agency of the U.S. Energy Department says it flew helicopters over three Minnesota farms this month to test technology aimed at limiting that interference.

Jeffrey Graves will take over as chief executive officer and join the board of directors in May. The Eden Prairie-based company makes test systems and sensors.