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Page 66 After adjustments, the proposed expansion project is estimated to generate a total of 38 trips (2 inbound and 2 outbound autos), (17 inbound and 17 outbound trucks) during the AM peak hour and the PM peak hour. The proposed expansion project is estimated to generate a total of 252 daily trips, with 8 inbound trips and 8 outbound auto trips, and 118 inbound trips and 118 outbound truck trips. The resulting daily truck traffic for.the proposed site is estimated at 90 percent for both inbound and outbound traffic. Project Trip Distribution and Assignment The directional distribution of approach and departure traffic for non-truck trips were determined based on the BNSF Traffic Study. Trip distribution for the truck traffic is based on existing truck traffic patterns to and from the site. For autos, it was estimated that 87% would arrive and depart from the northbound direction (i.e. tolfrom French Camp Road and Austin Road south of the site) and the remaining 13%will arrive and depart from the southbound direction (i.e. to/from Arch Road & Mariposa Road to the north of the site). For truck distribution, it was estimated that 90% of trucks using the site would arrive and depart from the southbound direction (i.e. to/from the Arch Road & Mariposa Road). The remaining 10% would arrive and depart from the northbound direction (i.e. to/from French Camp Road&. Austin Road south of the site). Figure D4 shows the percentage trip distribution and assignment for the proposed project. Intersection Level of Service Analysis The project-generated trips were added to the existing traffic volumes, and a level of service analysis was performed using the Traffix software. The sum of existing volumes, approved project trips and project generated trips for the study peak conditions are shown in Figure D-5. The project condition intersection geometry and control are the same as in the background condition. The analysis was performed for the four study intersections during the weekday AM and PM peak hours. The results of the intersection level of service calculations are summarized in Table D-6. Impact D.I. Decrease in Level of Service at Austin Rd./Mariposa Rd.intersection The results of the LOS analysis indicate that under project conditions, all study intersections will operate at acceptable levels of service (LOS) "D" or better with the exception of the Austin Rd/Mariposa Rd intersection, which would operate at unacceptable LOS "F" during the AM Peak hour. The LOS calculations for the project condition are provided in Appendix B. Mitigation Measure Dl_ In order to mitigate the substandard operating condition under project and cumulative conditions, the intersection of Austin Road& Mariposa Road will require traffic signals. The County shall install the signals, and the landfill owner shall pay a fair share contribution to County for the their installation. The signals shall be installed when warranted. Installation of traffic signals would improve the level of service at the Austin Road/Mariposa Road intersection to the levels shown on Table D-7: Mitigation analysis sheets are provided in Appendix B. - is not ful responsible for the installation of traffic signal at The Austin Road Landfrll project expansion ly po this location. This is because the unacceptable LOS is already projected under background conditions. However, the Austin Road Landfill will add some more traffic to the already congested intersection. Therefore, a fair share percentage of the project traffic is calculated at the Austin Rd/Mariposa Road intersection to determine its share of costs for the improvements. The fair share was determined by GRASSETT7 ENVIRONMENTAL CONSULTING