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III. ENVIRONMENTAL SETTING IMPACTS AND MITIGATION MEASURES C. TRAFFIC CIRCULATION AND SAFETY On the basis of the distribution of site-generated trips over hours of a weekday, vehicle trips during the a.m. peak hour would increase by about 76 round trips (152 one-way trips),and p.m. peak-hour trips would increase by about 10 round trips(20 one-way trips). For purposes of this EIR, a worst-case scenario is presented to assess the projected trip estimates based on the future permitted per-day maximum condition compared to the current actual condition,rather than comparing future trips to the maximum number of trips that could occur under the existing permit. It should be noted that project-generated increases in incoming waste and truck trips would not occur instantaneously,but rather would occur over time, as a function of population increases and other variables. Basing the analysis on this assumed worst-case scenario ensures that potential impacts are not underestimated. Trip Distribution and Assignment Peak-hour project-generated vehicle trips were geographically distributed based on the location of the project site relative to areas of the City of Stockton and of surrounding San Joaquin County, from which the various components of the waste stream are expected to be collected in the future. Professional judgment then was used to assign those trips to travel paths on the roadway network in the study area on the basis of minimized travel times and existing traffic patterns. Table III.0-6 presents peak-hour project trip distribution and assignment. Traffic Impacts Traffic levels of service for study intersections in the project area were analyzed after net new peak-hour project trips were added to existing traffic volumes (with traffic volumes adjusted to account for the influence of trucks on intersection operations, as described on page III.0-2). As shown in Table III.0-7, the study intersections would continue to operate at LOS C or better, except at the unsignalized Charter Way/Stockton Street intersection. The addition of project-generated traffic at the Charter/Stockton intersection during the a.m. peak hour, estimated to be no more than six outbound truck trips at maximum waste intake levels under the proposed permit(see Table III.0-6), would cause the service level to degrade from LOS E to LOS F(a significant impact). Level of service calculations are on-file and available for review at the City of Stockton Department of Community Development(Planning Division), 345 North El Dorado Street. Mitigation Measures Proposed as Part of the Project None. Mitigation Measures Identified in This Report Mitigation Measure C.1a: The City of Stockton, in cooperation with the California Department of Transportation (Caltrans), would install traffic signals at the intersection of Charter Way and Stockton Street at a time when intersection traffic volumes are high enough, as determined by the City and Caltrans,to justify such an installation, or at the discretion of the City's Director of Public Works and Caltrans. The project applicant would pay their fair share contribution to the cost of the signal installation. Storkton Sravenger Transfer Station Erpan.sion III.C.8 ESA 1990190