NATIONAL GRID TASK #71 OPERATOR EXCAVATION AND BACKFILLING EXAM QUESTIONS AND ANSWERS

NATIONAL GRID TASK #71
OPERATOR EXCAVATION AND
BACKFILLING EXAM



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

BEPM - Butane, Ethane, Propane, Methane - Correct Answers -What are the natural
gases?

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

electric - powerlines, cables, conduit, and lighting cables - Correct Answers -RED utility
markings is

communication - alarm or signal lines, cables or conduits - Correct Answers -ORANGE
utility markings is

gas - oil, steam, petroleum, or gaseous materials - Correct Answers -YELLOW utility
markings is

sewer - sewers and drain lines - Correct Answers -GREEN utility markings is

water - potable water - Correct Answers -BLUE utility markings is

slurry lines - reclaimed water, irrigation or slurry lines - Correct Answers -PURPLE utility
markings is

temporary survey markings - Correct Answers -PINK utility markings is

proposed excavation - Correct Answers -WHITE utility markings is

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