Thanks to Ausiello and DocArzt for the following casting notices. Any speculation as to who these characters are?
[FOREMAN]
40s to 50s, any ethnicity. A blue-collar construction worker. He's worked hard to get where he is and provide for his family. He cares deeply for his crew, hates it when management is condescending and arrogant but ultimately knows his place in the pecking order. CO-STAR.
[MARTHA]
35 to 40, Asian, attractive. A smart, capable scientist with a strong personality who has taken a break to raise her baby but plans to work again. Completely believes in the work she is doing but sometimes questions the decisions of those in charge...CO-STAR, RECURRING
[DAN]
40s, any ethnicity. A high-priced attorney, someone really sharp who can be friendly. However, there's a real menace lurking below the surface. RECURRING GUEST STAR
Source: DocArzt and Ausiello