Natural gas lines are not always buried at the same depth. While the pipes themselves do not move, the contours of the land where they are located may alter over the years. Check first by digging manually or with vacuum excavation equipment so as to avoid damaging any underground structures.
For more information and to know what factors you need to take into account when planning and carrying out your work, refer to the following guide
It outlines the steps to follow and provides information on the technical requirements for protecting natural gas installations, thus ensuring public and worker safety.