Does a stratified random sampling program meet the requirement?
The intent of the random sampling requirement is to ensure that bias does not enter into the acceptance decision. Stratified random sampling is acceptable. We are extremely concerned with the apparent requirement that the State DOT must perform independent verification sampling. The regulation does require verification of the quality of the material with independent samples taken by the State or its designated agent, excluding the contractor and vendor. “Verification testing shall be performed on samples that are taken independently of the quality control samples” Does “taken independently” infer that split samples are not permitted? For purposes of verification sampling and testing the samples are required to be independent samples, not split samples. Any split samples that are taken by the State can and should be used as part of the independent assurance (IA) program. Test results from split samples may also be analyzed in a manner that will treat the results as independent test resu
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