Beginning in 2016, NTPEP is auditing Corrugated Metal Pipe manufacturers, which includes split sample testing. Audit and test protocols are described in the "Project Work Plan." All audit requirements conform with the latest version of AASHTO Standard Specification M 36. The Work Plan can be found be clicking on "Documents" on the right side menu of this web page.
The NTPEP Technical Committee responsible for authoring the Project Work Plan convenes yearly at the national NTPEP Annual Meeting. During this working meeting, the Project Work Plan is discussed, changes made, and shortly thereafter balloted for adoption. Improvements are immediately implemented in the next available audit tour. When compared to other standards development exercises, the NTPEP process is agile, effective and efficient.