Washington Gas performed its deepest excavation and pipe placements to date this week, with trench depths exceeding ten feet from street level. This has to be done for the gas line to avoid existing storm sewers as well as new drainage structures that will be installed as part of the Klingle Trail. Also, utility regulations require all new gas lines to have a minimum one foot vertical clearance from water and sewer pipes.
For deep excavations, the gas line contractor must employ additional safety measures, including shoring boxes when trench entry is required, steel plates for temporary trench coverage, and remote-controlled compaction equipment.
Washington Gas is approximately 1/3 complete with Phase 1 of the gas line replacement as of September 18th.