Appendix H - Transportation Supporting Information COMBINED

3 BACKGROUND This analysis was prepared in accordance with the California Office of Planning and Research (OPR) Technical Advisory on Evaluating Transportation Impacts in CEQA (2018) and follows the guidance established in the City of Pleasanton’s 2023–2031 Housing Element Draft and Final Environmental Impact Report (EIR). VMT estimates were generated using the Alameda County Transportation Commission (ACTC) Countywide Travel Demand Model, a regional four-step model calibrated to pre- pandemic (2020) conditions and consistent with Plan Bay Area 2040 assumptions. The model was used to estimate Residential VMT per capita for the Traffic Analysis Zone (TAZ) encompassing the proposed Hidden Canyon Residences & Preserve project (TAZ #1190) under both Baseline (2020) and Cumulative (2040) scenarios for No Project and With Project conditions. Housing Element EIR VMT Analysis The Housing Element EIR concluded that VMT impacts from implementation of the Housing Element would be significant and unavoidable at both the project-level and cumulative level, even after the application of mitigation measures. Although the EIR disclosed that development consistent with the Housing Element Update would reduce the home-based VMT per capita to an average of 22.3 miles per resident by 2040, this value would still exceed the threshold of significance of 15.0 VMT per resident. This threshold reflects a 15 percent reduction below the Alameda County 2040 No Project average home-based VMT per capita. To address these impacts, the Housing Element EIR includes Mitigation Measure (MM) TRANS-2, which requires that individual housing projects not screened out from VMT analysis prepare a quantitative VMT assessment consistent with the methodology used in the EIR. If the project’s VMT exceeds the threshold, it must incorporate VMT reduction strategies aimed at reducing VMT. However, the EIR determined that while MM TRANS-2 would reduce VMT to some extent, the effectiveness of these measures in reducing project-level VMT below the significance threshold could not be guaranteed. As such, VMT impacts would remain significant and unavoidable, even with the implementation of MM TRANS-2 and associated mitigation measures. The proposed project was evaluated for consistency with the growth assumptions and cumulative impact analysis presented in the City of Pleasanton 2023–2031 Housing Element Draft and Final Environmental Impact Report (EIR). The proposed project is located on Site 1 of the Pleasanton Housing Element EIR’s Table 2-1: Potential Sites for Rezoning. The EIR identified this 128.5-acre parcel with a maximum capacity of 31 units. The proposed project includes 30 units (28 new and 2 replacement units), which is consistent with the Housing Element’s assumed buildout. As such, the project is consistent with the type and intensity of residential development evaluated in the Housing Element EIR, and its VMT impact has been previously disclosed at the programmatic level. PROJECT SCREENING Per OPR’s Technical Advisory (December 2018) and consistent with Housing Element EIR, residential projects may be presumed to have a less-than-significant VMT impact if they meet certain screening