I'm sorry to hear of the situation.
As a general rule, OSHA covers every employee in your workplace, regardless of the worker’s title, status, or classification. classification. It covers managers, partners, family members, rank-and-file employees, and so on. However, OSHA does not
apply to independent contractors. This is also the case with Cal-OSHA. Here is a link to a court opinion--see page 12 of the report, Iversen v. California Village Homeowners Association
(Cal. Ct. of App., 2d Dist.), 2011:
So long as the 2 or more contractors are all independent of one another, OSHA will not apply to them either.
I hope you found my answer informative.
I wish you the best in 2012.