Several contractors in Westchester County, N.Y., will face $130,600 in fines after a cave-in hazard was spotted at public library construction site by an OSHA ‘drive-by’ inspection.

The agency cited the four responsible contractors for allegedly violating excavation safety standards during the ongoing construction of the new public library in Briarcliff Manor, N.Y., according to an OSHA press release.

An OSHA inspector who was driving by the worksite observed employees working in an apparently unprotected excavation, and opened an inspection on the spot, the release said.

“The sizable fines proposed in this case reflect the fact that three of these four contractors knew cave-in protection must be in place before employees entered the excavation, yet elected not to provide this vital safeguard,” said Diana Cortez, OSHA’s area director in Tarrytown.