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Draft Supplemental Environmental Impact Report Page IV.B-10 Forward Inc.Landfill 2014 Expansion Project effects of existing conditions, approved projects, the proposed project, and other likely future projects, also are assessed. This section updates the impacts and mitigations considered in the 2013 EIR, to account for changes in the proposed project. To facilitate review of the section and comparison of analyses between the 2013 EIR and this document, the heading for each impact or mitigation measure reflects whether that impact is the same, revised, or replaced. For example,the heading for Impact B.1 is "Potential Project Impact to LOS at Nearby Intersections (Revises 2013 EIR Impact B.1)";the heading for Impact B.3 is"Queuing at Landfill Entrance (Same As 2013 EIR Impact B.3)". Criteria of Significance This section describes the thresholds of significance applied in this traffic study. The object of the thresholds is to clearly identify the significance of project-related impacts, distinguishing project-related impacts from the effects of background traffic conditions. In general, San �,. Joaquin County policy, which applies to study intersections 1 through 4, identifies a significant traffic impact at an intersection when the traffic generated by the proposed project would degrade the LOS of the intersection from an 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 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. Caltrans LOS policy, which applies to intersections 5 through 10, defines acceptable operations as an overall LOS E or better. Project Trip Generation For a variety of reasons, including economic conditions,landfill traffic varies over time. As discussed in Setting above,the landfill currently (2011-2012) generates an average of 212 trucks per day, although traffic has been higher in previous years. The permitted maximum is 620 vehicles. Because the proposed project would not change the daily permitted maximum of 620 vehicles, the maximum increase in daily traffic that could result from the project would be from �• the current 212 trucks (424 trips) to the permitted maximum of 620 trucks (1,240 trips). This assumption is used in the analysis below. In addition, there are currently 35 employee vehicles per day, or approximately 140 trips per day. Due to the nature of landfill operations, an increase to 620 trips per day would only require two additional employees to handle the additional incoming waste volume, or approximately 8 trips per day. This number is not considered a significant increase and is not further discussed in this analysis. The 2014 Expansion Project would extend the closing date of operations from 2021 to 2031. The net increase is project traffic is summarized as follows: • Daily trips—816 truck trips per day plus 8 employee commute trips per day ... • AM commute period—137 trips: 62 in/75 out(16.8 percent of daily total) • PM commute period—28 trips: 12 in/16 out(3.3 percent of daily total) Trip Distribution The directional distribution of landfill-generated trips through the study intersections is shown in Figure IV.B-3.