Plastic pipe shall be manufactured from Polyethylene (PE), High Density Polyethylene (HDPE), Poly vinyl chloride (PVC), Polypropylene, Steel Reinforced Polyethylene (SRPE) or Acrylonitrile-Butadiene-Styrene (ABS) material. Plastic pipe, couplings, and fittings for storm sewers, sanitary sewers or culverts shall meet the requirements of Section 4146 and 4149 of the Standard Specification of the Iowa Department of Transportation or applicable developmental specification.


Acceptance of these materials will be based on certification of compliance from an approved manufacturing plant and current report of successful NTPEP Plant Audit. PVC conduit and HDPE conduit will be accepted on certification of compliance / test report data.



Application for plant approval shall be made to the Construction and Materials Bureau in Ames, Iowa, and shall include product technical information and a description of product quality control procedures. A current report of successful NTPEP Plant Audit will be required for Plant Approval.


Initial approval will be based on the review of information submitted with the application for approval. Continued approval will be based on yearly reports of successful NTPEP plant audits.


Plants approved for plastic pipe for sewers, culverts or slip-lining applications are listed in the Materials Approved Products Listing Enterprise (MAPLE).



The approved manufacturer shall furnish, with each shipment, a certified bill of materials or invoice which identifies the contractor, project number, number of meters (feet) of pipe of each size, and number of pieces of couplings and fittings. Jobbers or other suppliers of material from an approved manufacturer shall furnish the above information along with a certificate of compliance from the approved manufacturer. The certificate of compliance shall be stated as follows:


The materials itemized in this shipment are certified to meet the requirements of the applicable specifications of the Iowa Department of Transportation.




Authorized Signature & Date


A responsible company representative shall sign the certification statement.


One copy of the certified bill of materials or invoice shall accompany each shipment and shall remain at the delivery point for the project inspector or shall be forwarded directly to the project engineer within Doc Express.


The fabricator or intermediate distributor shall also provide summary quantity documentation to the Project Engineer for shipments to each project.  It shall include the project number, type and size of items furnished, and the total quantity of each.  A designated representative shall sign the certification statement on summary documentation.



Samples taken for PVC conduit and HDPE conduit shall be as per IM 204az.  The sample shall contain the date and plant code.


Whenever possible, samples shall be taken at the plant or from stock prior to shipment to the project. The supplier should notify the District Materials Engineer with project responsibility, of pending shipments so that sampling can be arranged. Shipments of materials that have not been sampled for the project shall include extra lengths for sampling at the project site.



A monitor test sample shall consist of amounts and rates as indicated in IM 204az.  Deficient test results or poor workmanship on any monitor sample may be considered sufficient cause for removing a plant from the list of approved suppliers. Failure to maintain a report of successful NTPEP Plant Audit yearly shall be considered cause for removal of a facility from the list of approved suppliers.