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 I+CvAVPfr2z2lKn5ilGwEY8UQ0PZG0cg4OfCHeYmRKLENY4C/QT2gxJko7ucSEeJ