National Grid Task #71 Operator excavation and backfilling
1. Soil class is type c and its the What type of soil class is used for national grid and how
least stable stable is it?
2. BEPM - Butane, Ethane, What are the natural gases?
Propane, Methane
3. for all excavations at a depth of When is shoring mandatory?
5 feet or more
4. electric - powerlines, cables, RED utility markings is
conduit, and lighting cables
5. communication - alarm or signal ORANGE utility markings is
lines, cables or conduits
6. gas - oil, steam, petroleum, or YELLOW utility markings is
gaseous materials
7. sewer - sewers and drain lines GREEN utility markings is
8. water - potable water BLUE utility markings is
9. slurry lines - reclaimed water, ir- PURPLE utility markings is
rigation or slurry lines
10. temporary survey markings PINK utility markings is
11. proposed excavation WHITE utility markings is
12. white proposed excavation, pink Which utility markings are seen but not as prominent?
temp survey and purple slurry,
reclaimed and grey water and
radioactive lines
13. on 6" lifts
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1. Soil class is type c and its the What type of soil class is used for national grid and how
least stable stable is it?
2. BEPM - Butane, Ethane, What are the natural gases?
Propane, Methane
3. for all excavations at a depth of When is shoring mandatory?
5 feet or more
4. electric - powerlines, cables, RED utility markings is
conduit, and lighting cables
5. communication - alarm or signal ORANGE utility markings is
lines, cables or conduits
6. gas - oil, steam, petroleum, or YELLOW utility markings is
gaseous materials
7. sewer - sewers and drain lines GREEN utility markings is
8. water - potable water BLUE utility markings is
9. slurry lines - reclaimed water, ir- PURPLE utility markings is
rigation or slurry lines
10. temporary survey markings PINK utility markings is
11. proposed excavation WHITE utility markings is
12. white proposed excavation, pink Which utility markings are seen but not as prominent?
temp survey and purple slurry,
reclaimed and grey water and
radioactive lines
13. on 6" lifts
1/4
