National Grid Task #71 Operator excavation and backfilling Exam And Answers.

Soil class is type c and its the least stable - Answer What type of soil class is used for national grid and how stable is it? BEPM - Butane, Ethane, Propane, Methane - Answer What are the natural gases? for all excavations at a depth of 5 feet or more - Answer When is shoring mandatory? electric - powerlines, cables, conduit, and lighting cables - Answer RED utility markings is communication - alarm or signal lines, cables or conduits - Answer ORANGE utility markings is gas - oil, steam, petroleum, or gaseous materials - Answer YELLOW utility markings is sewer - sewers and drain lines - Answer GREEN utility markings is water - potable water - Answer BLUE utility markings is slurry lines - reclaimed water, irrigation or slurry lines - Answer PURPLE utility markings is temporary survey markings - Answer PINK utility markings is proposed excavation - Answer WHITE utility markings is white proposed excavation, pink temp survey and purple slurry, reclaimed and grey water and radioactive lines - Answer Which utility markings are seen but not as prominent? on 6" lifts - Answer when are pneumatic tamper and pavement breaker tamping foot used? on 6" to 12" lifts - Answer When are vibratory plate compactor and percussive whacker rammer used?