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Hi, I'm Mike and I'll be assisting you. Please stand by while I review your question.
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What is the load at the dock? Are all 3 on one circuit?
All underground wiring should be in PVC conduit at a 18" depth. The run to the dock should be #10 wire because of voltage drop. The others may be #12 wire.
Correction on the wire size to the dock
You need a #6. Carefully dig by hand over service wires.
A #6 UF cable
Easier to do the job not having pulling equipment.
Anytime you're welcome.