7　Pipeline Trench

7.1　General Provision

7.1.1　Depth and slope of pipeline trench shall be in compliance with design requirements.

7.1.2　When pipeline lies on side slope，the depth of pipeline trench shall be determined by shallower side of trench cross-section.

7.1.3　Consultation and approval with relevant departments and excavation procedures for crossing underground obstructions shall be formulated prior to pipe crossing.When crossing buried cable and underground pipeline，the net spacing of each shall be more than 0.5m and 0.3m respectively.