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Item 22 - Approve Adjustments & CIP Amendment, & Agreements with Mark Thomas, So Cal Regional Rail Authority (SCRRA), the U.S. Department of Transportation, & Caltrans for the Santa Ana Boulevard Grade Separation Project (No. 26-6718)
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Item 22 - Approve Adjustments & CIP Amendment, & Agreements with Mark Thomas, So Cal Regional Rail Authority (SCRRA), the U.S. Department of Transportation, & Caltrans for the Santa Ana Boulevard Grade Separation Project (No. 26-6718)
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4/30/2026 1:39:30 PM
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4/30/2026 8:07:46 AM
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Item #
22
Date
5/5/2026
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EXHIBIT 2 <br /> �OAA Santa Ana Boulevarei <br /> A <br /> /�iZ M r-!1e Separation Proje <br /> 11.2 Opening Year (2016) Rail-Highway Traffic Conditions <br /> 11.2.1 RAIL-HIGHWAY GRADE CROSSING DELAY <br /> Grade crossing blockage time and delay was determined based on a maximum of 10 <br /> trains per hour during each of the peak hours, 71 trains per day and a train speed of 66 <br /> feet per second (fps), or 45 miles per hour (mph). <br /> Table 15-1 Opening Year (2016) Rail-Highway Grade Crossing Delay Analysis <br /> Daily Delay AM Peak Delay PM Peak Delay <br /> Train Frequency (minutes/vehicle) (minutes/vehicle) (minutes/vehicle <br /> 71 trains per day 0.13 <br /> 8/10 (AM/PM) trains <br /> per hour 0.34 0.41 <br /> As shown in Table 15-1, the highest existing peak hour delay occurs during the PM peak <br /> hour where the delay is approximately 25 seconds per vehicle during the peak hour (0.41 <br /> minutes/vehicle = 25 seconds per vehicle). On average, there would be approximately 8 <br /> seconds delay per vehicle on a 24-hour period. The rail-highway delay calculations are <br /> provided in Appendix K. <br /> 11.2.2 RAIL-HIGHWAY GRADE CROSSING SAFETY ANALYSIS <br /> A hazard index was determined for the Santa Ana Boulevard grade crossing under <br /> Opening Year (2016) conditions. The hazard index is based on 71 trains per day and an <br /> arterial roadway segment ADT volume of 20,092. Table 16-1 summarizes the current <br /> hazard index for Opening Year (2016) conditions and the safety calculations are provided <br /> in Appendix L. <br /> Table 16-1 Opening Year (2016) Rail-Highway Grade Crossing Safety Analysis <br /> Train Volume ADT Volume <br /> (trains/day) (vehicles/day) Hazard Index <br /> 71 20,092 157 <br /> Traffic/Circulation Study—Final May 18,2012 <br /> Page 36 <br />
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