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4.4 Transportation and circulation V can be considered significant. The threshold for roadway structural sections is usually an increase in the Traffic Index of between 0.5 and 1.0. Intersection Analyses The following scenarios were analyzed for weekday AM peak hour conditions in this analysis, which typically occurs between 7:00 and 9:00 AM. • Existing Conditions • Existing With Seasonal Adjustments • Cumulative Without Project(Existing Conditions plus Approved Projects) • Cumulative With Project—Haul Route Option 1 • Cumulative With Project—Haul Route Option 2 • Future Conditions Without Project(Year 2025) L • Future Conditions With Project—Haul Route Option 1 • Future Conditions With Project—Haul Route Option 2 .. The PM peak hour, which typically occurs between 4:00 and 6:00 PM, was not analyzed because the project-generated traffic is expected to decrease significantly between approximately 3:00 and 4:00 PM,and as described above,24-hour machine counts conducted for this EIR indicate that truck traffic originating from the existing mining sites in the project area is negligible during the PM peak hour of the adjacent roads relative to the AM peak-hour volumes. i'• Generally-accepted traffic engineering principles and methods were employed to estimate the amount of traffic expected to be generated by the project and to analyze the traffic conditions expected to exist in the future. Project Impacts Intersection Operations Impact 4.4.1: The project would generate additional vehicle trips,primarily haul truck traffic,on project area roadways.The added traffic would affect traffic operating conditions.This would be a potentially significant impact. Trip Generation The proposed mining operation will produce aggregate products that will be shipped to Stockton, r Modesto, Sacramento, and the Bay Area via 25-ton-capacity trucks. The project is expected to generate an annual average of 2.85 million tons of material,with a peak annual production of 4.0 million tons of material,over a 60-year period. Material will typically be hauled in 25-ton- capacity trucks that will arrive at the site empty and leave the site full of material. The trucks would return to the site empty via the same route after delivery of the material. Daily and AM- peak-hour project traffic volumes were determined based on the maximum amount of material expected to be generated by the project(4.0 mty)and the capacity of the trucks hauling the material (25 tons)over an 8-hour-per-day, 260-day work year. The calculation includes an assumed seasonal adjustment factor of 1.6 based on numerous interviews with plant managers r RMC Pacific Vemalis Quarry Mining and Reclamation Project - ESA/203015 Draft Environmental Impact Report May 2006