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Independent assurance program (IAP)


checkmark   Double checks to make sure the testers and test equipment are working correctly. This includes contractor, state, county, city, and consultant staff and test equipment.

checkmark  IAP is done by district and central laboratory personnel.

checkmark  IAP double checks the testing of:
  • Hot-mix asphalt mix, pavement, and ride quality.
  • Portland cement concrete mix, pavement, and ride quality.
  • Aggregates.
  • Soils.
  • Binder sampling.
The IAP is a part of the Iowa DOT's Quality Assurance Program for Construction. Iowa DOT's IM 207 and Appendix A explain the program components and responsibilities. Another good source for more information is the FHWA Tech Brief.