I work for a Geotechnical/Environmental consulting company
So if you want to build anthing you would contract us to drill/test the soil.
Most days I'm in the lab testing the soil but once or twice a week I will go out on the rigs to drill or stay in the shop to help fix the rigs. I mostly do welding in the shop. On the rigs I will either extrude/log the sample or I will control the drill.
The rigs we use are mostly b-53 with an international or f800 truck, we also have a water injection buggy.
To drill we use a massive hydrolic arm to shove 5" shelby tubes in the ground then retract the arm and take the tube to the extraction area of the rig where another hydrolic aem pushes the sample from the tube and it will be sealed air tight and inspectes to determine if it is shale, limestone, fill, sandy clay, ect.
On the lab side we run moisture content and soil suction on almost every sample that we get.
I run AL tests which are a liquidity and plasticity peak test.
Qu- Stress test, I cut the sample to specs and put it in a pressure machine and run it to 100-9500 lbs and measure when it faila the test due to breaking or shearing.
Aps- Pressurised swell test, we submerge the sample with weights from 386-5000 grams and measure the swell.
Fs- same as aps but with weight determined by the sample ex. 2-4ft gets 800 grams.
Ect I don't feel like typing the complicated tests out on my phone.