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differences in regional traffic volumes between the current and previous modeling efforts are largely attributable to the greater accuracy of regional traffic projections in the current model. IMPACTS AND MITIGATION MEASURES IMPACT Transportation—Effects on 2025 Cumulative With-Project Conditions on Anticipated Network. This 4.11-1 scenario evaluates the traffic impact on the roadways in the project vicinity from the buildout of the proposed project and the remaining portions of the MHMP in the cumulative 2025 scenario. Under the cumulative 2025 scenario, some of the arterials in the project vicinity are projected to operate at an unacceptable LOS. Without mitigation, traffic impacts on these roadways would be significant. With implementation of the mitigation adopted previously for MHMP development, however, traffic effects on all but two of the arterial segments evaluated would be less than significant.Altamont Pass Road west of Grant Line Road would still be projected to operate at LOS F, resulting in a significant and unavoidable impact. This result is consistent with the results of the MHMP EIR.Also, Byron Road east of Grant Line Road is projected to operate at LOS 0, while the current acceptable standard for this roadway segment is LOS C. This segment was not projected to operate at an unacceptable LOS in the MHMP EIR. The effect on this segment would be potentially significant. In addition,several freeway segments in the project area are projected to " operate at LOS F,as found in the MHMP EIR.A significant and unavoidable impact would occur. This scenario considers the buildout of the cumulative 2025 land use and network conditions,including the addition of the traffic from buildout of all the neighborhoods assumed in the MHMP EIR,plus the proposed College Park land uses and the proposed Delta College. As of the preparation of this section,the City of Tracy was in the process of conducting a PSR for the addition of the Lammers Road Interchange at I-205.The proposed Lammers Road Interchange would be located on I-205 between Eleventh Street and Grant Line Road.In consultation with SJCOG staff,it was decided that the 2025 cumulative scenario for the traffic analysis should include scenarios both with and without the construction of the proposed I-205/Lammers Road Interchange,although funding is not currently available for the construction of the interchange.The purpose of including the scenario with the interchange in the current analysis is to briefly evaluate the potential impact or merits of the proposed interchange.However,the significance conclusions of the L current analysis do not include any assumed benefits of the Lammers Road Interchange(diversion of trips from Mountain House Parkway to Byron Road). Trip Generation Results of Modeling of Trip Generation The trip generation estimate produced by the SJCOG model for the proposed project is shown in Table 4.11-7.As indicated,the proposed project is projected to generate a total of 4,997 a.m.peak-hour trips and 5,913 p.m.peak- hour trips. Estimated trip generation for the MHMP at buildout is provided in Table 4.11-8 for two buildout scenarios: (1) 2010 buildout of the MHMP as currently approved(as reported in the MHMP)and(2)2025 buildout of the MHMP with development of the College Park site as proposed.As indicated,buildout of the MHMP with the — College Park project would result in slightly fewer total a.m. and p.m. peak-hour trips and fewer external a.m. and p.m.peak-hour trips than would buildout under the currently approved MHMP. Note that trip generation depends on land use and not the provision of transportation facilities such as highway interchanges.Therefore,trip generation estimates for 2025 buildout with the project would be the same with and without the construction of the proposed I-205/Lammers Road Interchange. — College Park at Mountain House Specific Plan III Draft EIR EDAW San Joaquin County 4.11-25 Transportation