Different utility lines, that neither interfere up to the surface, they are stored completely underground. The character of soil disturbance by the earthwork, excavation, laying of utilities, protective layers and re-filling.
Mistari shirika tofauti, Hiyo Wala kuingilia kati juu ya uso, Wao Je Kuhifadhiwa kabisa chini ya ardhi. tabia ya usumbufu wa ardhi na excavation earthwork, kuwekewa vifaa, tabaka kinga na re-kujaza.