A sink hole/ground collapse happened in my front lawn and is 6 feet deep and 7 feet wide, almost reaching the residence. My question is what type of professional can I contact to get it evaluated and fixed? Also can anyone give me the names of companies, contractors or contracts, numbers to call, I have no idea what to do about this. Called 311 and they don't know either, just that its my problem to fix. I live in Queens,NY.