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The County has adopted LOS D as the standard on Byron Road from the county line to Wicklund Road as part of its strategy to reduce vehicle trips.Adopting the current mitigation measure would extend this strategy to cover an additional portion of this roadway.With this standard,the projected cumulative traffic effect on this roadway would be less than significant. According to the MHMP EIR,"As an alternative to widening the I-205 freeway beyond six lanes,the project sponsor shall contribute a fair share to the development of a parallel east-west roadway system north of I-205, extending between Mountain House and the City of Lathrop's Gold Rush City development,including the necessary multi jurisdictional altemativelfeasibility studies."Recent news reports indicate that the River Island project in Lathrop will be funding a portion of the proposed Golden Valley Parkway north of the heavily congested I-205. A preliminary alignment of this roadway is shown in the draft City of Tracy General Plan.The County should work with the City of Tracy in the future to conduct more detailed analysis of the area,possibly conducting a plan line study for the roadway. Such an effort could also result in reduced cumulative traffic effects on the existing roadways. There is no additional mitigation available to reduce the 2025 cumulative traffic impact on Altamont Pass Road west of Grant Line Road and on 1-580,1-205,and I-5 north of I-205 to a less-than-significant level.Impacts on these roadway segments therefore would remain significant and unavoidable. IMPACT Transportation—Potential Traffic Safety Issues during Construction. Project construction would be 4.11-2 required to comply with the Mountain House Construction Management Plan, which would preclude roadway ` damage and safety problems from occurring.A less-than-significant impact would occur. Construction-related truck traffic could pose several concerns,including safety issues as well as damage to roadways. San Joaquin County has adopted the Mountain House Construction Management Plan,which identifies " approved roadways for use by project-related construction vehicles and establishes regular monitoring of the approved roadways to assess potential damage to them and to avoid potential conflicts with MHMP residents.The MHCSD would require the general contractor for each phase of construction to be in compliance with the Mountain House Construction Management Plan.With implementation of these measures, a less-than- significant impact would occur. .. Mitigation Measure 4.11.2:Transportation—Potential Traffic Safety Issues during Construction. No mitigation is required. 4.11.5 RESIDUAL SIGNIFICANT IMPACTS As discussed under Impact 4.11-1,project traffic would contribute to an increase in vehicular traffic along segments of 1-205,1-580,and I-5. As concluded in the MIRAP EIR(and shown in Table 4.11-14),most sections of the freeways are expected to operate at LOS F.The results of the freeway analysis described above are consistent with the results of the MHMP EIR in terms of segment LOS operations. The MHMP EIR proposed a number of mitigation measures related to freeway impacts.Most of these measures include proposed and planned freeway and interchange improvements projects to which the MHMP would contribute a proportionate fair share of the funding.The freeway mitigation measures from the MHMP EIR are described in Table 4.11-18.As with other developers in the MHMP area,the College Park developers shall participate in a proportionate fair share cost of the freeway project funding based on the MHTIF/ RAF fair share program However,even with this action,the impacts to the freeways would remain significant and unavoidable. In addition,despite the implementation of safety and operational improvements on Altamont Pass Road west of Grant Line Road this roadway segment is expected to operate at LOS F after mitigation,which is similar to the results identified in the MHMP EIR.Therefore,the cumulative traffic effect on this segment would be significant and unavoidable. College Park at Mountain House Specific Plan III Draft EIR EDAW San Joaquin County 4.11-55 Transportation