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San Joaquin County Community Environmental Setting,Impacts,and Mitigation Measures <br /> Development Department Transportation and Tmffic <br /> Table 3.L-13. Estimated Roadway Traffic Index (TI)Values Two-Way Traffic <br /> Year 2007 <br /> Existing Baseline <br /> Conditions Conditions <br /> Roadway Segment TI(10-Year) TI(10-Year) <br /> Koster Road between Blewett Road and Quarry 9.0(Calc) 9.0 <br /> Entrance <br /> Blewett Road between Koster Road and Bird Road 9.0(calc) 9.5 <br /> Bird Road between Blewett Road and SR 132 10.5(calc) 10.5 <br /> Source: Omni-Means 2005. <br /> The Caltrans method for determining ESAL is based on average truck weights on <br /> the state highways with some of these trucks fully loaded and some are empty. <br /> As previously noted,a lower TI value was previously used for southbound Bird <br /> Road because the majority of trucks are traveling empty in this direction and are <br /> significantly lighter than the loaded northbound Bird Road trucks. To develop an <br /> estimated TI value that would account for lighter empty trucks traveling in one <br /> direction of travel, a separate TI value was developed for each direction with — <br /> empty trucks assumed to be represented by 4-axle vehicles for the purpose of <br /> calculating ESAL (all aggregate trucks whether empty or loaded were evaluated <br /> as 5-axle vehicles when calculating the TI values shown in Table 3.L-13). <br /> Directions in which the majority of trucks are assumed empty include <br /> southbound Bird Road between SR 132 and Blewett Road, eastbound Blewett <br /> Road between Bird Road and Koster Road, and northbound Koster Road to the _ <br /> project entrance(Omni-Means 2005). <br /> Table 3.L-14 presents the calculated TI values by direction of travel on Bird <br /> Road,Blewett Road and Koster Road just south of the DeSilva Gates quarry <br /> entrance for existing(10-year TI value),and year 2007 base(10-year TI value) <br /> traffic conditions. <br /> Table 3.L-14. Estimated Roadway Traffic Index (TI)Values by Direction of <br /> Travel <br /> Year 2007 <br /> Existing Baseline <br /> Conditions Conditions _ <br /> Roadway Segment T1(10-Year) TI(10-Year) <br /> Koster Road between Blewett Road and Quarry Entrance 8.0(NB)/ 8.0(NB)/ <br /> 9.0(SB) 9.0(SB) <br /> Blewett Road between Koster Road and Bird Road 8.5(EB)/ 8.5(EB)/ <br /> 9.0(WB) 9.5(WB) <br /> Bird Road between Blewett Road and SR 132 9.5(SB)/ 9.5(SB)/ <br /> 10.5 (NB) 10.5(NB) — <br /> Source: Omni-Means 2005. <br /> DeSilva Gates Quarry Project — <br /> Draft Environmental Impact Report 31-14 <br /> J8s 05105.05 <br />