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Draft Environmental Impact Report Page IV.B-11 Forward Inc. Landfill Expansion generated by the proposed project would degrade the LOS of the intersection from an 4 acceptable LOS (i.e., A, B, C, or D) to an unacceptable LOS (i.e., E or F). If project-generated traffic exceeds the County's LOS standards, then mitigation measures that would improve the r LOS to an acceptable level must be identified. If the LOS for conditions at a given location is already at an unacceptable LOS, then mitigation measures that would return the v/c ratio (volume/capacity) to the "existing" (without project)level must be identified. Project Trip Generation Table IV.13-7 presents trip generation estimates for trips generated by the proposed project. The I proposed project would increase the daily trucks from 620 to 960, an increase of 340 trucks and 680 truck trips. In keeping with a worst case analysis, it was assumed that all new project trips would be truck trips. LOS calculations for the Existing and Existing Plus Approved Projects scenarios assume ten percent of the traffic is trucks. Because the proposed project traffic would be nearly all trucks, the truck percentage was assumed to increase to 20 percent. I For a previous transportation study at the site, Forward Inc. collected information on existing travel associated with the existing Forward Landfill for six days in June 2002:June 11 through June 13, and June 26 through June 28. The data show the number of inbound vehicles by hour between 6:00 a.m. and 6:00 p.m. Traffic counts taken at the project driveway indicate that approximately 10 percent of the landfill's total daily trips occur during the AM peak hour. Approximately 6 percent of the total daily trips occur during the PM peak hour. The traffic data collected in February 2009 indicate that the facility was not operating at full capacity during the counts. Therefore,AM and PM peak hour traffic are estimated by applying the percent of traffic in each peak hour to the net daily increase. Table IV.B-7 PROJECT TRIP GENERATION Project Trips Condition Daily Trips AM Peak Hour PM Peak Hour In Out In Out f Existing 1,240 51 46 14 23 Proposed 1,920 85 80 35 44 Net Increase 1 680 1 34 34__L 21 21 Notes: 1. The number of Daily Trips is the maximum amount allowed under the existing Land Use Permit for the Existing Condition and under the proposed permits for the Proposed Condition. 2. The percent of trips occurring in the peak hours(10 percent in the AM and 6 percent I in the PM)is assumed to remain the same in the Proposed Condition. ' 3. Proposed trips assume a 50/50 In/Out split for new trips. Trip Distribution The directional distribution of new project-generated trips through the study intersections is shown in Figure IV.B-4. The largest portion(45 percent) of project traffic travels on Arch Road and Route 99. Twenty five percent uses French Camp Road, and 20 percent uses Mariposa Road. The remaining ten percent uses local roads. i