Identify OSHA regulations or standards applicable to each scenario.

Scenario:      

OSHA has cited your company, Smith & Baker   Construction Co. (SBCC), in the past year for violations. SBCC operates in   three Western states: California, Arizona and Nevada. The violations were for   the following accidents: Andrew fell into an open excavation in California,   and the company failed to identify the hazard. Thomas fell from scaffolding   during construction of a three-story office building in Arizona. Lindsay became   ill from breathing toxic contamination as she walked the work site in Nevada.

Answer the following question in 150 to 200 words. No introduction or conclusion necessary. Just the answer for the question:

 Identify OSHA regulations or standards applicable to each scenario.