Corrugated polyethylene pipe (CP)
*NOTE: Corrugated polyethylene dual wall type pipe is abbreviated as "CP" in MnDOT specifications. Corregated polyethlene is also commonly refered to as "HDPE" pipe. Corrugated Polyethylene Pipe (HDPE) manufacturing facilities are required to be reviewed and in compliance with AASHTO's National Transportation Product Evaluation Program (NTPEP) for producers of HDPE thermoplastic pipe.
Determine if a pipe manufacturing plant is qualified as a supplier to MnDOT. (site works best with Chrome) Search for the plant in question and once selected, verify the audit status and effective date under the "Audit Information" tab. If the audit is compliant and current this plant has met MnDOT requirements. When opening the Audit Production report under the Production Reports section of the Audit Information tab, the blue X's denote that a particular size and type of pipe is manufactured at that location.