I'm not quite sure how to use this site either so if I respond the wrong way, just let me know the protocol. 

Perhaps I have just been looking at the wrong sites but I feel that they do not provide enough information.2.

It's only a "problem" for someone else who comes along and tries to sell the house from underneath you during that limited time period.Somebody please correct me if I'm wrong and this is a bigger problem than I think it is.I don't personally do it and I probably won't for the foreseeable future.

I'd love you guys to talk me out of it, if I've done the math wrong or have missed something obvious.  

But if you can drop 20 to 30k without a heartbeat then I think that's just cost of doing business and I for one see absolutely nothing wrong with it..

@Ryan Charles don't take this the wrong way but the information is out there, you just have to find it.

Let's talk about what can go wrong in a situation like this.

This seems wrong.

It doesn't sound like you have done anything wrong yet either so something isn't making sense here.

You would be responsible per the EPA to clean it up and you have to keep digging and re-testing until you get clear margins on the soil all the way around the site.