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SUBARTICLE 346- 9 . 1 (Pages 333 — 334 ) is deleted and the following substituted : 346-9 . 1 General : Perform plastic properties tests in accordance with 346 - 8 and cast a set of three QC cylinders (either 4 inch by 8 inch or 6 inch by 12 inch cylinders are acceptable) , for all structural concrete incorporated into the project . Take these acceptance samples randomly as determined by a random number generator (acceptable to the Department) . The Department will independently perform verification plastic properties tests and cast a set of verification cylinders . The verification cylinders will be the same size cylinder selected by the Contractor, from a separate sample from the same load of concrete as the Contractor ' s QC sample . The Department may perform inspections in lieu of plastic properties tests of the precast plants producing Class I and II concrete . For each set of QC cylinders verified by the Department, cast one additional cylinder from the same sample , and identify it as the QC "hold" cylinder. The Department will also cast one additional "hold" cylinder from each Verification sample . Provide curing facilities that have the capacity to store all QC , Verification, "hold" and Independent Verification cylinders simultaneously for the initial curing . All cylinders will be clearly identified as outlined in the Sample/Lot Numbering System instructions located on the State Materials Office website . Deliver the QC samples , including the QC "hold" cylinder to the final curing facility in accordance with ASTM C 31 . At this same time , the Department will deliver the Verification ' samples , including the Verification "hold" cylinder, to their final curing facility. Test the QC laboratory cured samples for compressive strength at the age of 28 days , or any other specified age , in a laboratory meeting and maintaining at all times the qualification requirements listed in Section 105 . The QC testing laboratory will input the compressive strength test results into the Department ' s sample tracking database within 24 hours . When the QC testing laboratory cannot gth test results into the Department ' s sample tracking database within input the compressive stren 24 hours , the QC testing laboratory will notify the Verification testing laboratory within 24 hours of testing the cylinder and provide the Verification testing laboratory the compressive strength test results . Ensure the compressive strength results are input into the Department ' s sample tracking database within 72 hours of determining the compressive strength of the cylinders . The Department will average the QC compressive strength test data, average the Verification compressive strength test data, and compare the averages . In the event that one set of compressive strength data for a set of cylinders falls outside the range of the other set of cylinders , use the lower Range of Average Compressive Strength to determine the comparison the Department will determine if the Comparison Criteria as criteria. Based on this comparison, shown in Table 7 has been met . When the difference between QC and Verification are less than or equal to the Comparison Criteria, the QC data is verified. When the difference between QC and Verification data exceeds the Comparison Criteria, the Engineer will initiate the resolution procedure . Table 7 Range of Average Compressive Strength Comparison Criteria Less than 3500 psi 420 psi 3 , 501 — 4 , 500 psi 590 psi 4 , 501 — 6 , 500 psi 910 psi - 123 - FPID ( S ) : 423186 - 1 - 58 - 01