BURGETTSTOWN (KDKA) — After several reports of strong odors of gas in a Washington County clinic, the odor has now been identified.

A test at the Smith Township Plaza shows a brief spike in a chemical often used as a solvent.

It led to three evacuations at Cornerstone Care’s Community Medical and Dental Plaza in recent weeks.

The state DEP says the source remains a mystery.

The DEP has asked cornerstone to conduct a more extensive inventory of all chemicals stored in the building.

CEO Bob Mountjoy says they’ll do it again but aren’t confident it will yield a cause.

“Our goal is to reopen this building to our patients – whatever that takes,” he said.

For Cornerstone the mysterious odor remains just that — a mystery, but Range and environmental officials are confident that whatever sickened workers here had nothing to with shale gas drilling.

The clinic has been closed for about a month and a half.

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