NJ is definitely polluted. America was built on the back of NJ industry. NJ has not begin given its just due in regard to the hundreds of sites that are essentially unusable at this point, and it's a shame because there is a growing dearth of land in proximity to places people work.

To the OC of this chain, cleanups vary from site to site. Sometimes there's digs. Sometimes there's monitoring and capping. It really depends on what's there. If it's buried household waste, essentially, capping it and preventing it from being disturbed, placing monitoring wells downstream to monitor for any impacts to groundwater, you kind of cover all the bases.

And that's a simplistic recap, but at the end of the day you identify what's there, identify if and where it's going, and from there you determine the course of action.