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Here they require 3 foot of cover and a horizontal separation of one foot between electric and communication if they are in the same trench. They can't be on top of each other. They have to be side by side. A natural gas line has to be in a separate trench. Water and sewer lines in separate trench. Any new construction, electric and communication has to be in conduit. Some places require in conduit and concrete encased.
If they have water and sewer there, I would think they may end up in the same trench side by side deep since the lines in the street are deep.
If they have water and sewer there, I would think they may end up in the same trench side by side deep since the lines in the street are deep.