A damaged gas pipeline or service line to a house or building can create an explosion hazard that could endanger both people and property. Natural gas pipelines and other underground utilities (water and sewer lines, electrical conduit) could be within a few feet of the grounds surface. At least 2 business days before you dig or grade or have a contractor excavate or grade on your property, please notify your utility providers by calling USA (Underground Service Alert) and also confirm that any contractor excavating on your property notifies USA.