THE RESULTS OF TESTS ON INDEPENDENT ASSURANCE SAMPLES ARE NOT THE BASIS OF ACCEPTANCE.
Correlating Acceptance and/or Verification Tests and
Independent Assurance Tests project’s Materials Certification
(IAS). that job
The Resident Engineer must certify control test results compare favorably
on each with the
results of Independent Assurance sampling and testing. Register instructions and can be subjected to audit inquiries.
In order to ensure that job control acceptance samples correspond reasonably with Independent Assurance Samples, either a graphical or a tabular correlation must be done. The Materials Division is responsible for making this correlation. The Resident Engineer shall provide a copy of both the Contractor’s acceptance test results and the Department’s verification and/or acceptance test results to the District Materials Supervisor (DMS) for the correlation whenever an IAS test is requested or scheduled.
A prompt comparison and documentation shall be made of test results obtained by the tester(s) being evaluated and IAS tester. This will be accomplished by the DMS, who will correlate IAS test results with job acceptance and/or verification test results. This correlation will be a comparison of test results of IAS and split samples and/or the last five (5) (if available) acceptance samples (including verification samples). The Materials Division Area Engineer will send a copy of the IAS test results and correlation to the Resident Engineer. IAS test results and correlations shall be retained in the Resident Engineer’s job file.
In the event an Independent Assurance Test fails to correlate acceptably with the job acceptance and/or verification tests, the materials and field sampling procedures must be reviewed. Questions to be answered are:
Were the samples for IAS and Acceptance and/or Verification Samples representative samples?
Were proper sampling techniques/procedures used to obtain the samples?
Was the correct testing equipment properly calibrated and in good working order for performing the test?
Were tests performed in accordance with the methods set forth in the "Manual of Field Sampling and Testing Procedures"?
Was the lack of correlation due to material variability?
If the Resident Engineer’s test results do not correlate, independent reviews will be conducted by the Resident Engineer on the Resident Engineer's equipment and testing procedures and by the Materials Division’s area Engineer on the DMS’s equipment and
testing procedures. Once Division’s Area Engineer
reviews are completed, the Resident Engineer, and the DMS will discuss their findings.
Engineer will write a brief summary of the findings and initiate corrective action necessary. Each individual will sign the summary of reported findings and forward it the Construction Engineer.