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San Joaquin County Community Environmental Setting,Impacts,and Mitigation Measures Development Department Transportation and Traffic Table 3.L-8. Year 2007 Baseline Aggregate Truck Trip Distributions _ Direction - Initial Distribution(%) Secondary Distribution(%) Westbound on SR 132 to 1-580 45% Northbound on I-580 45% Eastbound on SR 132 to I-5 55% Eastbound on SR 132 beyond 1-5 8% Northbound on I-5 40% Southbound on 1-5 7% Total 100% 100% Source: Omni-Means 2005. Figure 3.L-I shows the projected year 2007 baseline AM and PM peak hour traffic volumes while Figure 3.L-2 shows the projected year 2007 baseline daily traffic volumes. Baseline Traffic Operations The"Existing and Forecasted Study Area Traffic Volumes and Resulting Traffic Operations"report identified and evaluated three interchange design alternatives. Alternative 1 represents a diamond interchange alternative concept, Alternative 2 represents a modified par-cloe interchange concept,and Alternative 3 is a combination of Alternatives I (to the south of Route 132)and Alternative 2 (to the north of Route 132)(Omni-Means 2005). The year 2007 AM and PM peak hour traffic volumes for each interchange alternative are shown on Figure 3.L-3. Based on the operation projections,Alternative I represents the worst-case traffic operation design alternative of the three and is used in this operations analysis for impact comparisons. Intersections As shown in Table 3.L-9,the SR 132 ramp intersections with Bird Road are projected to operate at a LOS`B"during both the AM and PM peak hours under the worst-case design alternative. The Blewett Road intersections with Bird Road and Koster Road arc projected to operate at LOS "A/B"for both peak hour periods. DeSilva Gates Quarry Project Draft Environmental Impact Report 31-9 J85 05105.05