MARK THOMAS & COMPANY - FOURTH AMENDMENT (#2023416)

Page 2 of 4 In 2021, the West Las Positas Boulevard Street Sinking Repair Reserve, CIP No. 11514, and the West Las Positas Bicycle and Pedestrian Improvements Project, CIP No. 17567, were combined into one CIP and renamed the West Las Positas Boulevard Multimodal Reconstruction Project, CIP No. 11514, to address both roadway settlement issues and pedestrian/bicycle improvements. On December 6, 2022, the City Council awarded an agreement to Mark Thomas to provide 35 percent design that aided the development of construction phasing and implementation plans for the project. The contract term was extended by the First Amendment to the Agreement on June 14, 2024. On July 16, 2024, the City Council authorized the Second Amendment to the Mark Thomas agreement to complete the 100 percent design and create bid documents for construction for the section of West Las Positas between Hopyard Road and the Iron Horse Trail. On October 21, 2025, the City Council authorized the Third Amendment to the Agreement to include additional work required that was not captured in the added scope of work in Amendment 2. This added scope is needed to complete the 100 percent design for the Hopyard Road to Iron Horse Trail section. The City's Capital Improvement Plan (CIP) for Fiscal Year 2025/2026 included a new project, which separates the Phase 2 work for the West Las Positas Multimodal Reconstruction Project. CIP 26514 was established and funded with grants from the Alameda County Transportation Commission (CTC) and Measure BB Bike and Pedestrian funding. The proposed Fourth Amendment to the agreement with Mark Thomas, covering the 100 percent design for Phase 2 of the West Las Positas project, will be fully funded under CIP 26514. DISCUSSION West Las Positas Boulevard Multimodal Reconstruction The concept design cost estimates for the long-term multimodal improvements between Foothill Road and Fairlands Drive ranged from $25-$30 million, exceeding available funding. To determine the implementation strategy with limited funding, the project was divided into multiple segments. • Phase 1 of the project, from Hopyard Road to Iron Horse Trail, addresses the most significant roadway settlement. • Phase 2 of the project extends from Iron Horse Trail to Santa Rita Road and addresses the most significant pedestrian and bicycle conflicts with vehicles. In Phase 2, the center median will be narrowed, bike lanes will be elevated to sidewalk grade, and a landscape buffer will be created to further separate vehicles from bicyclists. A new sidewalk will be installed along the south side of the street, and a pedestrian crosswalk will be added to Owens Drive to facilitate pedestrian crossing of West Las Positas Boulevard. The Santa Rita Road intersection will be modified to eliminate the southwest "pork chop" island, and the northwest "pork chop" will be modified to allow for controlled pedestrian and bicycle movements to the elevated bike lane and sidewalk. Schedule Docusign Envelope ID: 13052E52-7AE9-4FA9-885F-4547DF464456