(1) Every employer carrying out any excavation or tunnelling work at a construction site of a building or other construction work shall, within thirty days prior to the commencement of such excavation or tunnelling work, inform in writing the detailed layout plans, method of construction and schedule of such excavation or tunnelling work to the principal employer, if any, and to the Chief Inspector.
(2) In case, compressed air is used in such excavation or tunnelling work or any work incidental to or required for such excavation or tunnelling work, the technical details and drawings of all man-locks and medical-locks together with names and addresses of all construction medical officers having qualification as laid down in Schedule IX, and so appointed by such employer for the purpose of such excavation or tunnelling work, shall be sent to the principal employer, if any, and to the Chief Inspector.