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San Joaquin County Community Other CEQA Considerations Development Department Implementation of Mitigation Measure CE-9 would reduce this impact to a less-than-cumulatively considerable level. Mitigation Measure CE-10: Install Traffic Signal at Bird Road/SR 132 Eastbound Ramps The installation of a traffic signal at the Bird Road/SR 132 eastbound ramps intersection is not warranted when the interchange is first constructed and open for use, and is not projected to be warranted for at least 15-20 years. As such,the traffic signal will not be installed with construction of the SR 132/Bird Road interchange. The signal warrants analysis prepared for the SR 132/Bird Road interchange project estimated that the traffic signal would be warranted when production levels within the study area reach approximately 13 million tons per year of exported material. A traffic signal warrants analysis should be prepared when area production reaches this level to — determine whether the traffic signal is warranted. If not warranted,the intersection should be periodically monitored as production levels continue to increase and new traffic signal warrants analysis prepared. A — traffic signal warrants analysis should also be prepared irregardless of the area's production level if wan-anted to ensure traffic safety and adequate intersection operations. The project proponent will contribute their fair share to the warrant analysis and signal installation. The County will be responsible to ensure that the traffic signal is installed when warranted. Impact CE-11 : Cumulative Structural Damage to Existing County Roadways (Less than Cumulatively Considerable with Mitigation Incorporated) Cumulative traffic levels forecasted for the year 2027 would increase the estimated structural section TI over the estimated year 2027 base conditions structural section TI on both Koster Road from the Project's entrance south to — Blewett Road and on Bird Road north of Blewett Road by 0.5 respectively. This would result in significant structural impacts on these roadways. The proposed project would contribute to the cumulative structural degradation of these — roadways. Implementation of Mitigation Measure CE-10 would reduce this impact to a less-than-cumulatively considerable level. Mitigation Measure CE-11: Add Asphalt Concrete Lift to — Koster Road and Bird Road The project proponent will contribute their fair share to add an asphalt — concrete lift on Koster Road from the proposed project's entrance south to Blewett Road and an asphalt concrete lift on Bird Road north of Blewett Road. According to the County of San Joaquin Department of Public Works Improvement Standards,a roadway's structural pavement design is calculated based on the TI value and the resistance value of DeSilva Gates Quarry Project — Draft Environmental Impact Report 5-12 J&S 05105.05