4.2　Technical preparations

4.2.1　The technical preparations shall ensure that the smooth interfacing and on-site check of the control stakes and bench marks，which should be rechecked with the same accuracy.

4.2.2　The construction plan shall include:

1　Project overview；

2　Project construction features，challenges and precautions，as well as requirements on project construction period，safety，quality，health，site cleaning，environmental protection，etc.；

3　Layout of sites and temporary facilities at ground surface，layout of underground pipelines，as well as compressed-air supply，water supply and power supply；

4　Construction schemes and process；

5　Supply plan for machinery，labor and main materials；

6　Construction schedule and relevant progress indexes；

7　Construction management，project quality and safety guarantee measures；

8　Direct and potential impacts on the environment during project construction，as well as prevention and protection measures taken.

4.2.3　Safety，quality，and technical trainings shall be provided for the construction workers before and during the construction. eI8y875m2z6n+IqqPgM5v1vAWJ2nwk3mps5lho8yb5FyVO7323jIhymtQ/INk5dQ