WYOMISSING, Pa. (AP) – Pennsylvania prosecutors are accusing an excavation company of altering the results of water sampling tests, leading to a contaminated water line being used to serve about 40 homes.

The attorney general’s office on Friday announced charges against 43-year-old Matthew Barrasso of Mohnton that include tampering with public records and forgery.

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He’s the owner of Barrasso Excavation Inc., based near Reading. Barrasso didn’t return phone messages left Friday at his home and work.

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Prosecutors say he admitted to altering a test result on a line built in Wyomissing in 2017 so that it no longer said that coliform and E. coli had been found.

He’s also accused of falsifying the results of testing on a newly installed water line Quarryville in 2016.

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