181-26 Exhibit A- Final Specifications_compressed.pdf

Percent Defective (PD) Per Lot Reduction Per Lot (%) 0 < PD ≤ 15 0 15 < PD ≤ 30 0.5 30 < PD ≤ 35 2 35 < PD ≤ 40 10 40 < PD ≤ 45 15 45 < PD ≤ 50 20 50 < PD ≤ 60 30 60 < PD ≤ 75 45 PD > 75 Remove & Replace 5. Outlier Detection. If PD < 10, the Laboratory will not screen for outliers. If PD ≥ 10, the Laboratory will screen acceptance cores for outliers using a statistically valid procedure. The following procedure applies only for a sample size of 5 or 10. 1. The Laboratory will arrange the core results in ascending order, in which X1 represents the smallest value and XN represents the largest value. 2. If XN is suspected of being an outlier, the Laboratory will calculate: 3. If X1 is suspected of being an outlier, the Laboratory will calculate: 4. For N = 5 if R > 0.642, the value is judged to be statistically significant and the core is excluded. For N = 10 if R > 0.412, the value is judged to be statistically significant and the core is excluded. If an outlier is detected for N = 5 and no retest is warranted, the Contractor may replace that core by taking an additional core at the same offset and within 5 feet of the original station. If an outlier is detected and a retest is justified, take a replacement core for the outlier at the same time as the 5 additional retest cores are taken. If the outlier replacement core is not taken within 15 days, the Laboratory will use the initial core results to determine reduction per lot. If an outlier is detected for N = 10, the Contractor may replace that core by taking an additional core at the same

se the initial core results to determine reduction per lot. If an outlier is detected for N = 10, the Contractor may replace that core by taking an additional core at the same offset and within 5 feet of the original station. If the outlier replacement core is not taken within 15 days, the Laboratory will use the initial core results to determine the reduction per lot. 6. Retest. If the initial series of 5 cores produces a percent defective value of PD  30 for mainline or ramp lots, or PD  50 for other pavement lots, the Contractor may elect to take an additional set of 5 cores at random locations chosen by the HMA Core Sampling Plan form. Take the additional cores within 15 days of receipt of the initial core results. If the additional cores are not taken within the 15 days, the Laboratory will use the initial core results to determine the PPA. If the additional cores are taken, the Laboratory will recalculate the reduction per lot using the combined results from the 10 cores. 7. Removal and Replacement. If the final lot PD ≥ 75 (based on the combined set of 10 cores or 5 cores if the Contractor does not take additional cores), remove and replace the lot and all overlying work. The replacement HELEN AVE., LAWRENCE AVE., FLORENCE PL., AND LOWELL AVE., IMPROVEMENTS PROJECT Page 44 of 76