ANSWERS: 4
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You can’t run you gas, water and drain in the same trench due to permutation of the pipes, the gas seeping into the water pipe and contaminate it.
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If something goes wrong later, you do not want that mess.
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Your answer can be found in the uniform building codes of the area you live in. Some allow this but there has to be a minimum separation between utilities.
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I would think putting a gas line in a trench with anything else would be risky. You need to contact your local building inspectors to find out what "code" is in your area.
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