National Grid Task -71 Operator excavation and backfilling questions with right answers

National Grid Task 71 Operator
excavation and backfilling


Soil class is type c and its the least stable - answersWhat type of soil class is used for
national grid and how stable is it?

BEPM - Butane, Ethane, Propane, Methane - answersWhat are the natural gases?

for all excavations at a depth of 5 feet or more - answersWhen is shoring mandatory?

electric - powerlines, cables, conduit, and lighting cables - answersRED utility markings
is

communication - alarm or signal lines, cables or conduits - answersORANGE utility
markings is

gas - oil, steam, petroleum, or gaseous materials - answersYELLOW utility markings is

sewer - sewers and drain lines - answersGREEN utility markings is

water - potable water - answersBLUE utility markings is

slurry lines - reclaimed water, irrigation or slurry lines - answersPURPLE utility markings
is

temporary survey markings - answersPINK utility markings is

proposed excavation - answersWHITE utility markings is

white proposed excavation, pink temp survey and purple slurry, reclaimed and grey
water and radioactive lines - answersWhich utility markings are seen but not as
prominent?

on 6" lifts - answerswhen are pneumatic tamper and pavement breaker tamping foot
used?

on 6" to 12" lifts - answersWhen are vibratory plate compactor and percussive whacker
rammer used?