(A) Pavement thickness determination for acceptance shall be based on two-inch diameter cores. Three cores shall be taken from the pavement at generated random locations within each unit. A unit shall consist of 1,000 square yards of pavement surface or fraction of, dependent on the length of the roadway per lane. A unit length shall be considered as the entire length of a driving lane from the edge of payment to edge of pavement of any intersecting roadways or from the edge of pavement of any intersecting roadway to the end of an improvement. The width of each unit shall be the lane width of the roadway as shown on the typical section for that specific roadway. For fractional units, the number of cores will be adjusted to one core per 333 square yards or less. Improved shoulders and improved lanes shall be considered as fractional units.
(B) The owner and the Director of Engineering or his assignee shall witness the coring operations, as well as the measuring and recording of the cores. Core measurements will be determined immediately upon removal from the core bit and prior to moving to the next core location. Upon concurrence of the length, the core samples may be disposed of. Upon completion of coring, all core holes shall be filled with a rapid hardening mortar or concrete.
(C) In considering any portion of the pavement that is deficient, the limits of the unit or fraction of a unit to be used in computing the deficiency will be determined by the Director of Engineering, except that no portion of the pavement once included in such computation will be included in a second computation. The average thickness of the pavement in each unit will be determined by obtaining a weighted average of the cores, considering that each core represents the thickness of the pavement extending longitudinally in both directions halfway to the nearest core, or to the end of the unit. Measurements which exceed the plan thickness shall be considered as the specified thickness. When the average thickness of a unit is equal to or more than 92.5% of the specified plan thickness, no deficiency payment will be required. When the average thickness of a unit is less than 92.5% but equal to or more than 80% of the specified plan thickness, a deficiency payment shall be made by the owner to the road authority assuming maintenance of the roads within the development. The deficiency payment shall be a percentage of the total cost of the road surface material (PCC pavement or HMA surface and binder) for that unit as determined by the owner's engineer's estimate of cost used for the security for the improvement.
Average Thickness of Pavement in Percent of Plan Thickness | Percent of Total Pavement Cost per Unit |
Average Thickness of Pavement in Percent of Plan Thickness | Percent of Total Pavement Cost per Unit |
92.5% to 90% | 10% |
89% | 11% |
88% | 12% |
87% | 13% |
86% | 14% |
85% | 15% |
84% | 16% |
83% | 17% |
82% | 18% |
81% | 19% |
80% | 20% |
<80% | Removal and replacement of other remedial action approved by the Director of Engineering |
(D) An additional three cores may be taken within each unit at the request of the owner. The weighted average for the unit will then be recalculated for the determination of the deficiency payment. Area adjustments will be made so that no one core represents more than one-third of a unit area or less than one-sixth of a unit area when additional cores are taken.
(Ord. 9278, passed 6-22-2015)