Quality Assurance Program - Oregon Department Of Transportation Page 6
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28ODOT Quality Assurance Program
OCAPA Executive Director or Representative
AGC Heavy Highway Representative
Industry “At Large” Representative (appointed by Committee)
Random Samples
The Quality Assurance Program is based on theoretical conditions and the application of
statistical acceptance procedures. Sampling shall be by simple random, stratified random, or
systematic means as specified.
To obtain a representative sample, a reliable system of random sampling shall be employed.
Some work, like process control, lends itself quite well to the use of the Random Units Table and
the Random Sample Location forms that ODOT has developed. ODOT TM 400 (Determining
Random Sampling and Testing Locations) is also available to assist with Random Number
determinations and test site locations. This is the preferred method to assure that the samples are
representative and eliminate sampling bias. In other work, like Verification or Independent
Assurance, it may be difficult to apply random numbers to sample selection. In this case, it is
imperative that the samples are taken at locations or times, which do not have an identifiable
pattern, and are completely random and without bias.
Commercial Source Quality Control
The ODOT quality assurance program allows some freedom for commercial sources to establish
their own quality control plan that is tailored to the operation of the specific commercial source.
The commercial supplier is required to submit a written quality control plan to the appropriate
Region Quality Assurance Coordinator for approval. All testing for the approved quality control
plan is required to be performed by a certified technician in an ODOT certified laboratory.
Specific details on Commercial Source Quality Control may be found in Appendix D.
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