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18-29-702.5.1.3  Buried pipe.
   The pipe to be buried shall be of heavy schedule. Below grade compression couplings shall have an outer shell of A1SI 300 series stainless steel or material of equal corrosion resistance. All piping and fittings shall be free of scratches. Underground piping, fittings and compression couplings shall be protected from direct contact with the earth or backfill material.