Most of the systems I've installed, have been backfilled with a small d3 size dozer, always running perpendicular to the pipe, not problem running on the system because of the low ground pressure, no real point loading like tires, did the same when there was only a backhoe, but pushing and riding the fill in the same direction so as to use the dirt as a cushion and empty the bucket taking the weight off the front end before crossing pipe, when you cant't reach with the bucket and had to cross pipe, I used to mound up a bit for added protection, or adjust my gameplan somehow to minimize running on the system, never run parallel to pipe.
Reason I mention it is it don't take much to crush or damage a pipe in some circumstances when the cover material is not deep, or soils are soft. If it's wet or moist in there, a few passes is all it takes, dryer firm type soils, much are more forgiving, but around a leach field it can most certainly be soft. I'd not want to be running on that with a tractor that has narrow front tires, they cut in deep when it's soft.
I can remember a private school job where we installed 6" water main to the new building going up, and one of the loader operators kept running on the freshly filled trench, it was compacted in 12" lifts, and tight, but it still broke the main, spent the entire weekend on site dealing with it, graduation was real close, what a mess this was, he could have gone around, but hey we got lots of OT that week because of it !
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