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.
The FICO score range dips as low as 300 and rises as high as 850. The average credit score is somewhere around the high 600s to low 700s. I say somewhere because there are always different numbers being cited by different sources, and the data is often outdated.