So I have some good news! The testing on the property next door came back, and it was negative!! So I contacted the township clerk. (that took nearly a week). I ended up paying an actual visit because I couldn’t get a phone call back.
While I was there she called the environmental consultant. One of the things that she asked was could the sign be moved because it was affecting my ability to sell my house. (She had driven down the street that morning to see for herself and agreed it was off-putting).
The environmental consultant said the sign had to be public and allow access, but that the township could decide what that meant!!
As you can imagine, I was one happy customer. I’ll upload a video of where they put the sign tomorrow.