Environmentally safe underground piping system

A secondarily contained underground piping system which interconnects at least one underground storage tank dispensing pump to at least one above-ground dispensing unit comprising,

• an originating chamber adjacent said dispensing pump and having at least one opening therein for pipe access thereto,
• a terminating chamber positioned under said above-ground dispensing unit and having at least one opening therein for pipe access thereto;
• a transfer pipe operably connected to said dispensing pump and said above-ground dispensing unit, said transfer pipe passing through an opening in said originating chamber and an opening in said terminating chamber, wherein said transfer pipe comprises:
• an inner supply pipe for transferring fluid therethrough,
• said inner supply pipe comprising an outer damage protection layer,
• an inner permeation barrier layer having a smooth surface for contact with fluid in said inner pipe,
• a middle flexible fill layer between said outer and inner layers;
• a fiber reenforcement layer on said middle layer and in contact with said outer layer;
• and
• an outer secondary containment pipe member spaced from said inner supply pipe for defining an interstitial space between said inner supply pipe and said containment pipe, and a
• means for sealing said transfer pipe in at least one of said openings.