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Traffic Impact Study March 24,2004 - Proposed RMC Pacific Mining Site Page 3 6.0—TRAFFIC ANALYSES 6.1 —Proiect and Approved Project Traffic Volumes Daily and peak-hour project traffic volumes were determined based on the maximum amount of material expected to be generated by the project and the capacity of the trucks hauling the material. The calculation of project traffic volumes is presented in Appendix A. Employee traffic is not expected to occur during the peak hour and is not included in the analyses. The calculation includes an assumed seasonal adjustment factor of 1.6. This adjustment is applied to convert the average annual daily and peak-hour project traffic volumes to the corresponding — volumes that would be expected during summer months, when production reaches seasonal peaks. Table 1 presents daily and peak-hour project traffic volumes expected during peak summer months. Table 1 Prosect Trip Generation — Daily Trips Daily Trips Total Daily Peak Hour Peak Hour Total Peak EnteringExitingTris Tri s Enterin Trips Exitin Hour Trips 981 1 981 1,962 1 153 153 307 — The anticipated project traffic volumes and distribution are shown in Figures 7 through 10 for — Haul Routes 1 and 2, respectively. The distribution of project traffic to the adjacent road network was determined based on discussions with the project Applicant and County staff during a project site walk-through. The traffic volumes expected to be generated by the approved mining site not yet in operation on Bird Road south of Blewett Road are shown in Figures 11 and 12. These approved-project — traffic volumes were estimated based on a review of the Environmental Impact Reports for Brown Sand and Gravel(final report dated July 1997, State Clearing House Number 960-42075). 6.2—Existing and Cumulative Traffic Volumes Existing traffic volumes were determined by performing manual turning movement counts at _ each of the project intersections. The counts were performed by the independent traffic counting firm of Southland Car Counters. Existing peak-hour turning movement volumes at the study intersections are presented in Figures 13 and 14. Traffic volumes on freeways and freeway _ ramps were determined by reviewing data presented in previous Environmental Impact Reports, data available on the Caltrans web site, and balancing with existing traffic counts on State Route 132. Considering that the existing mining operations are expected to generate more trucks during peak summer months, a seasonal adjustment factor of 1.6 was applied to the traffic volumes on the _ local roads in the vicinity of the mining sites. The adjusted existing traffic volumes with seasonal adjustments are shown in Figures 15 and 16. In addition to manual turning movement counts, 24-hour machine counts were performed at various locations. The results of the counts are presented in Appendix A. The results of the counts verify the assumption that PM peak hour analyses are not required for the project. Truck —