Richmond American Homes and d-7 Roofing, a subcontractor, have been cited for serious and repeat violations of safety rules at construction projects in Littleton and Aurora, the U.S. Department of Labor Labor Occupational Safety and Health Administration said Monday.

OSHA began its investigations in Littleton in December and cited Richmond for failing to inspect the site and d-7 for violations including failing to provide fall protection and eye protection for workers using pneumatic nail guns. D-7 had been cited for similar violations in 2011 and 2012 at other worksites.

The investigation began at the Aurora jobsite on Jan. 27 and both companies were cited for the same reasons.

OSHA has proposed fines of $10,000 for Richmond American, and $65,490 for d-7 Roofing. The companies have until Wednesday to take corrective action and pay the fines, request a conference with OSHA’s area director David Nelson, or contest the citations and penalties to the Occupational Safety and Health Review Commission.