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gas lines are usually buried 450 and 600mm deep. Gas to a house is most likely around 18 inches for the house line around 30 to 36 gas main and water is around 3 to 4 feet towards the north where it gets cold. I guess you know the electric and phone could be buried too.
If there is a residue, you should clean the gas line in the same way that you did the beer lines. After the beer lines have been cleaned and sanitized, use the faucet brush to scrub. out the faucet and keg tap. Once these are cleaned, you should inspect all of the parts, especially the rubber gaskets and O-rings.