Hi Phil -
The hole at this point is about 5 feet across & getting bigger & about 7-8 feet deep. Living in Vt I'm at a loss of what dept to contact & ask the right questions - you suggest - "contact the city /county" is a little vague. I was hoping for more specifics. Who determines what the cause is? There is no fracking in VT - well at least in our county (Rutland). Thanks for your help.