In making any excavations in any street, alley, or public place, Company, its successors and assigns, shall protect the site while work is in progress by guards, barriers or signals, shall not unnecessarily obstruct the use of the streets, and shall back fill all openings in such manner as to prevent settling or depressions in surface, pavement or sidewalk of such excavations with same materials, restoring the condition as nearly as practical. The Company shall not be required to restore or modify public right of way, sidewalks or other areas in or adjacent to the Company project to a condition superior to its immediate previously existing condition.