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EXHIBIT 2 <br /> 2.0 Methodology <br /> Figure 2-1: Sample Pavement Deterioration Curve <br /> Zoo <br /> Very Good Do Nothing <br /> 85 — — — — — — — — — — — — — — — — — — — — <br /> Good Surface Seal <br /> a75 — — — — — — — — — — — — — — — — _ — — — — — — — — — <br /> 0 <br /> Fair Overlay <br /> 60 } — — — — — — — — — — — — — — — — — — — — — — — - — — — — — — — - <br /> 0 Poor Resurfacing <br /> 40 - - - - - <br /> v <br /> M Very Poor Reconstruction <br /> 0 - <br /> Pavement Life(yrs) <br /> To develop an accurate PDC, "suspicious" data / anomalies outside of the maximum and <br /> minimum envelopes generated from StreetSaver are filtered out. For example, data with PCI <br /> increase significantly with age (recording error) or lack of past inspection data must be removed <br /> because pavements are load carrying structures, which degrade over time due to the combined <br /> action of environmental and traffic. This data filtering processing is critical because pavements <br /> with unusual performance would have substantial impact on the PDC behavior and the pavement <br /> life cycle consequently. <br /> The final PDCs illustrate that the rate of deterioration is fairly slow in the early years of the <br /> pavement's design life. During the first 65 percent to 75 percent of a pavement's design life, <br /> which varies based on functional classifications and surface type, a pavement deteriorates <br /> approximately 40 percent of its quality, i.e. from a PCI of 100 ("Very Good" condition) to a PCI of <br /> 60 ("Fair" condition). However, the rate of deterioration starts to increase rapidly with age after a <br /> pavement reaches this point in its life cycle. Typically, a pavement can deteriorate 40 percent in <br /> its quality (PCI quickly drops from 60 ("Fair" condition) to 20 ("Very Poor" condition)) in the next <br /> 15 percent to 25 percent of its design life. Although the local and arterial networks have different <br /> design life spans, both PDCs share similar characteristics because the pavement will crack and <br /> these cracks will propagate out and become severe with continued traffic loadings and weathering <br /> without any M&R treatment. Therefore, a PCI of 60 is assigned as the critical PCI for both the <br /> arterial and local networks. The critical PCI is defined as the PCI value after which a pavement <br /> section is expected to deteriorate rapidly with age or where the rate of PCI loss increases <br /> significantly with time. <br /> City of Santa Ana 2026 Pavement Management Program 2-2-3 <br />