Analysis of QA procedures at the Oregon Department of Transportation.
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2010-06-01
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Edition:Final report.
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Abstract:This research explored the Oregon Department of Transportation (ODOT) practice of Independent Assurance (IA),
for validation of the contractor’s test methods, and Verification, for validation of the contractor’s Quality Control
(QC) data. The intent of the project was to discover whether adjusted or additional processes for comparison
between ODOT’s test results and the contractor’s test results may be available to improve confidence regarding
whether the contractor’s test results are reliable. It was found that ODOT utilizes a combination IA/Verification
process that uses the comparison of single results for its IA and Verification decisions. Based on statistical
principles, published literature, FHWA guidance, and a small case study, recommendations were made that ODOT
establish the breadth of systematic testing bias and that the IA and Verification processes be enhanced to include
statistically-based comparison tests, including the often-used t-test and F-test.
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