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f Draft Environmental Impact Report Page IV.B-18 Forward Inc. Landfill Expansion Cumulative Scenario Intersection Operations Deficiencies Traffic levels associated with cumulative development without the proposed project would cause the intersection of Austin Road and Arch Road to operate at an unacceptable LOS F during the PM peak hour. In the Mariposa Lakes traffic study cited above, the poor performance of this intersection is attributed to an extremely high volume of eastbound to northbound left turn traffic. It should be noted that this would occur without the proposed project, and is not attributable to the proposed project. s, Cumulative-Plus-Project Traffic Volumes Traffic under this condition is estimated by adding project-related traffic to traffic volumes associated with background cumulative development projects. As discussed in Chapter III, Project Description,the proposed expanded Forward Landfill is projected to cease operations in year 2034. If this were to occur,no Forward Landfill traffic would be generated in the 2035 cumulative horizon year. However,long-term projections of landfill life are subject to variability, due to unpredictable future changes in solid waste generation,economic activity, recycling patterns, laws and regulations, compaction and Fsettlement of disposed waste, and other factors. Therefore, it is reasonably likely that the proposed project, if approved, could continue operations beyond 2034 into 2035. Furthermore, even if landfill operations cease operations in 2034,traffic levels at that time would very likely be similar to traffic levels in the 2035 horizon year for Cumulative analysis stipulated in City of F� Stockton guidelines for transportation analysis. For these reasons, project trips are added to the Cumulative No Project condition,to provide a reasonable "worst case" evaluation. LOS calculations for the Cumulative scenario assume 20 percent of the traffic is trucks, for consistency with the Mariposa Lakes project. Because the project traffic would be nearly all trucks, the truck percentage was assumed to increase to 30 percent for the Plus Project condition. F; The resulting AM and PM peak hour traffic volumes at the study intersections under cumulative-plus-project conditions are shown in Figure IV.B-7, and levels of service that would occur at these intersections and the project driveway are presented in Table IV.B-I1. Detailed intersection operation calculations are presented in Appendix C. P.1 Fw F. l. ' . 5