Line 400 Depth of Burial Survey
October , 2011
The purpose of this depth of burial survey was to determine the elevation of the two 26″ pipelines that comprise the Line 400 Sacramento River pipeline crossing, and the 22kV cable river crossing at the Rio Vista Bridge. After being uncovered by the Derrick Barge, which utilized a 12″ Air-Lift, Global was contracted to take pneumofathometer readings at the top of the pipes. This was necessary in order to identify the cable and pipeline depth for upcoming navigation channel dredge work. If pipelines were established to be at too shallow a depth, the pipeline and cables will subsequently need to be relocated.