We're considering putting in a geothermal system, which would require two closed vertical loops in our backyard. Our concern is that we'd be retrofitting an existing house, so we're nervous about the disturbances that could be caused by drilling two 300+ ft holes near our house and water well. Due to the shape of our property, the holes would probably be at best only about 20-30ft from our well and 15-20 ft from our foundation. We also live near several stone quarries so we assume that there's a good chance that the drillers may require especially invasive machinery to get down 300 ft.
Has anyone heard of any permanent damage done by nearby drilling (house foundation cracking, well refill rate dropping, etc)?
Thanks in advance.