Here's the situation. My project installed underground PVC conduit via directional boring almost 10 years ago. We used ground penetrating radar to document it's path and it was documented to be more or less installed straight (+/- 4-5") between to hand holes approximately 200-300' from one another under an aircraft taxi way, this was done about 20 times in a straight line. In my most novice electrical engineering opinion, the soil through which this bore was installed is sandy (low country of South Carolina near the ocean if that helps). So here's my dilemma, a new installation is digging a trench approximately 5' from and parallel to the conduit installation mentioned before, utilizing a backhoe and digging approximately 8' deep. The backhoe has now snagged the PVC conduit in two locations while digging its trench. SO for all the soil guys out there, is it conceivable for undisturbed soil to shift laterally underground by 5-8' in 10 years, taking what is suspended in it with it? If so, is this common? If not, could anyone offer an explanation for what I'm seeing here?
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