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4. ENVIRONMENTAL ANALYSIS 4.4 TRANSPORTATION AND CIRCULATION - Interstate 580/SR 132 Interchange Freeway weaving and ramp analyses indicate that the interchange is expected to operate at acceptable levels of service through the year 2025 with the project based on the projected traffic volumes. Mitigation Measure 4.4.1a: The intersection of Koster and Blewett Roads will require widening to accommodate truck turning movements if access to the mining site is provided via Koster Road,or if Haul Route Option 2 is allowed. If the County allows the use of this haul route,the project sponsor would fund its fair share of this measure as a condition of approval of the project. Peters Engineering Group conducted a Fair-Share Percentage analysis as part of its Traffic Impact Study for this project. This analysis is contained in Appendix C. Mitigation Measure 4.4.1b: As a condition of approval,the applicant will be required to contribute an equitable share of the cost of the construction of a new interchange at SR 132 and Bird Road. Caltrans has approved a Project Study Report for an interchange to replace the existing intersection. The proposed interchange is expected to mitigate the cumulative impacts to the intersection. Significance atter Mitigation: Less-than-significant. Regional Roadway Operations Impact 4.4.2: The project would increase traffic on regional roadways in the project vicinity. This would be a potentially significant impact. A discussion of the project's potential impact to each roadway segment is provided below: Bird Road between Blewett Road and SR 132 Bird Road currently operates at LOS A and is expected to continue to operate at acceptable levels of service with the proposed project through the year 2025. _ SR 132 between Interstate 580 and McCracken Road The analysis concludes that the segments of SR 132 that consist of only one lane in each direction are currently operating at LOS D. Where SR 132 is a four-lane divided highway,the road segment operates at acceptable levels of service. With construction of the project, similar levels of service,ranging from LOS D to LOS E are expected to result. Based on these factors, it is concluded that SR 132 should be widened to four travel lanes in each direction as soon as feasible. With construction of two additional lanes in each direction, SR 132 is expected to — operate at acceptable levels of service through the year 2025. RMC Pack Vernalis Quany Mining and Reclamatimt Pmject 4.4-16 ESA 1203015 Administrative Dmft Eai March 2004