2010$ = 2010 fiscal year?

No, it probably means in 2010 dollars, i.e. adjusted for inflation over the course of the project, normalized to the value of the dollar in 2010.

Got it.
Thank you.

Does "3.8 million-years of employment" mean:

every year 3.8 million jobs?

Not quite. One person working one year is a job-year. It could be 3.8 million people each working one year only in a job generated by the project. It could be 1.9 million people each working two years. It could be 380,000 people each working 10 years in the project. It could be some aggregate of peopple, some working six months, some three years, some ten years in the project, totalling 3.8 million job-years, and so on.

Cool.
Thanks.