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An underground pipe buried in northern Alabama should be buried at least _____ deep in order to prevent from damage.CorrectIncorrect
Consider the installation of underground piping. In trenches cut through rock, tamped backfill shall be used for at last 2 feet _____.CorrectIncorrect
What is the manufacturing standard for polyethylene encasement for ductile iron pipe systems used for underground piping?CorrectIncorrect