Appendix H - Transportation Supporting Information COMBINED

Transportation Impact Study for Hidden Canyon Residences & Preserve March 2023 Page | 1 EXECUTIVE SUMMARY This report summarizes the results of the Transportation Impact Study (TIS) conducted for a proposed 30- unit residential development with dedicated public park open space located on the south side of Dublin Canyon Road in unincorporated Pleasanton, California. The TIS evaluated potential transportation impacts resulting from the proposed project based on the City of Pleasanton’s significance criteria. Traffic operations were evaluated at 10 study intersections during the weekday morning peak hours (7:00 a.m. to 9:00 a.m.) and evening peak hours (4:00 p.m. to 6:00 p.m.) under six study scenarios. The study intersections were evaluated under No Project and plus Project scenarios for Existing, Near Term, and Cumulative Conditions. The study area is illustrated on Figure 1. PROJECT DESCRIPTION The project site comprises four parcels totaling approximately 128.5 acres on the periphery of Pleasanton’s northwestern city limit line. Two existing single-family dwellings are located on the eastern portion of the project site. Ponderosa Homes II, Inc. proposes to develop the site with 30 single-family detached houses, 28 new dwellings (lots 1 to 28) and replacement of the two existing dwellings (lots 29 and 30). Approximately 70 acres would be transferred to the East Bay Regional Park District (EBPRD) for a publicly accessible open space that would comprise 55 percent of the site area. Of note, previous iterations of the development program included one additional residential unit (totaling 31); to be consistent with previous iterations of this TIS and thus presenting a conservative assessment, the analysis of the “plus Project” scenarios includes the additional unit. The proposed site plan is shown on Figure 2 with more detailed site access points shown on Figure 2b and 2c. Appendix A provides detailed project plans. Circulation within the residential portions of the site would be accommodated by two proposed streets, identified as Street A and Street B on the proposed plans: • Street B would provide access to Lots 1 to 28 via an intersection with Dublin Canyon Road approximately 300 feet west of Canyon Creek Circle. The intersection would be expanded to provide a westbound left-turn lane from Dublin Canyon Road for inbound project traffic. As proposed, most of Street B would have a curb-to-curb width of 28 feet, except the portion within approximately 200 feet of Dublin Canyon Road that would widen to provide a turnaround with a 48-foot radius while the segment within approximately 100 feet of the intersection with Dublin Canyon Road would have a width of approximately 80 feet, including a six-foot wide median. Five-foot wide sidewalks would be constructed on both sides of the street except between Lots 2 and 6 where the sidewalk would be limited to one side only. • Street A would intersect Street B and would serve as internal circulation within the site and would provide an emergency vehicle access (EVA) connection to an existing driveway located at 10971 Dublin Canyon Road, located on the south side of Dublin Canyon Road, east of Canyon Meadows Drive. The EVA portion of Street A would be paved to a width of 20 feet. The portions of Street A that would provide direct access to residential parcels would be paved to a curb-to-curb width of