5.4.1 After an excavation cross-section is formed,cross-section survey shall be made.
5.4.2 The interval of the cross-section survey shall comply with the requirements in Table 5.4.2.
Table 5.4.2 Invertal of cross-section survey y51loJXcoDgSSjt0vK2ueYVPhL5UaDlstZnvHvkMoEOJ+oOEGa30GLBskWydfW+H