How to dig the narrowest 3' deep trench or minimize sand fill for a wide trench?

[orezok]

Perhaps you don’t understand reality due to lack of experience.

 

[4570Man]

Perhaps you don’t understand reality due to lack of experience.

I understand that I’m working with budget constraints every day and I can’t afford to make every single thing 2-3 times more expensive against an extremely small chance of a slightly harder repair. We’re laying 300 ft of conduit here a fairly easy diy job it’s not building a nuclear reactor. And you keep diverting without answering my original question. Have you ever successfully dug up and repaired a residential service line without just ripping up the entire thing and replacing it anyway?

 

[Wagtail]

Following.

 

[AnotherBueller]

Dig the ditch…..install electrical……once it’s passed out the 2” in right on top of sand covering the other conduit
I mean once it’s passed who’ll know what’s under it

Need to have a minimum of 12" between power lines and cat 5e/6e data cables with all crosses at right angles or there WILL be data speed lost or NO data if the run is long enough. Optical fiber lines need much less separation, like >2 inches. If I was doing is I'd spend the extra money and use direct bury cable. The reason is that direct bury is water proof and I don't think that I would warranty that job any other way because, between both entry points and all the joints, I don't think I could keep water out of the conduit.
By the way 300 feet is the max distance for CAT 5e/6e before data speed drops to a unusable speed.