The federal brownfields statute defers jurisdiction of such sites to the state so that, in effect, the brownfields agreement is the agreement that governs the liability from the state and federal level.
The maximum FICO score is 850 (minimum 300). Another common credit score is the VantageScore; the maximum is 990 (minimum 501). There are other credit scores, from the credit bureau and other third-parties. If you purchase one of these scores, the score provider will give you the scale for that score.
FICO credit scores range from 300-850. FICO no longer releases the median nationwide score, but as of April 2014, the national median FICO score was 692. Keeping that median in mind, a 620 minimum is fairly borrower-friendly.