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An emergency warning system for Exelon Generation Co.'s Muddy Run Pumped Storage Facility will be tested on Thursday, according to a news release.

The test is scheduled for 10 a.m., when a brief tone will sound, followed by "This is a test, this is a test." The test will last around two minutes, according to the release. The public and local emergency organizations are not required to do anything during it.

In a real emergency, the tone would be followed by "This is an emergency, please move to higher ground, this is an emergency, please move to higher ground."

The system is designed to warn the residents of cottages along a portion of Conowingo Pond during an emergency at Muddy Run, with six sets of loudspeakers mounted on poles upstream and downstream from the facility, according to the release. The poles were installed in Lower Chanceford and Peach Bottom townships in York County, as well as Drumore Township in Lancaster County.

Muddy Run Pumped Storage Facility is an electric generating station built in 1968 and operated by Exelon that includes a 1,000-acre, 250-foot deep reservoir located in Martic and Drumore townships in Lancaster County.

Exelon installed the system in 2003 as another method of warning the public of an emergency, with an emphasis on cottage owners living along the Susquehanna River, according to the release.

The system sounds every three months, on the second Thursday of January, April, July and October around 10 a.m.

Prior to the tests, Exelon sends notifications to local authorities in each township and county along the lower Susquehanna River between the Norman Wood Bridge and the Peach Bottom Atomic Power Station, according to the release.

— Reach Christopher Dornblaser at cdornblaser@yorkdispatch.com.

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