I need to grind 2 massive tree stumps that are within 20 feet (linear) of my geo pipes.... The geo is 3 years old, so all the soil has settled. The geo is 3 feet down at minimum. The 2 trees that died are about 20 feet away from the geo field, rather large stumps. Do you think the vibrations from stump grinding will disturb the underground piping ?? also, the stump grinding machine weighs 5000 lbs... which will be driven close to the geo field, but not over. What are your thoughts ??