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The Arroyo Mocho Medeiros Reach Floodplain and Riparian Restoration Project (Medeiros Project) is an integral component of the regional flood control and habitat restoration strategy for Arroyo Mocho in Zone 7's service area. The project is located within a 40-acre area along the 0.7-mile Medeiros Reach of Arroyo Mocho in the City of Livermore. The Medeiros Reach of Arroyo Mocho is located between Arroyo Road and Holmes Street, south of College Avenue. The project would occur on public property owned by Zone 7.

Project Schedule: Project planning, design, and permitting will continue through 2018. Construction is anticipated during 2019 and 2020.

Project Contact: Emily Moshier, Associate Engineer (925) 454-5035


Zone 7 released a draft Initial Study/Mitigated Negative Declaration for the Arroyo Mocho Medeiros Reach Floodplain and Riparian Restoration Project under the California Environmental Quality Act (CEQA) on April 25, 2018. A Mitigated Negative Declaration means that Zone 7 has studied the potential environmental impacts of the project and determined that any impacts can be avoided or mitigated to a point where no significant impacts to the environment would occur. Based on community feedback, Zone 7 extended the comment period to June 8, 2018 to receive additional community feedback, met with the City of Livermore about the project twice and also attended a site visit with approximately 20 community members.

Zone 7 values the public's input and as a result of the comments received, has decided to revise the project. The current Medeiros Project will be split into two distinct projects. The first project will include lowering the bike path to allow water to spill into the Oak Grove Nature Reserve and reconnect it to the floodplain during high flows (storms with once every 10-year to 25-year frequency). This project will proceed with design and is expected to be implemented in 2019. Zone 7 will be preparing a new CEQA document for this reduced project and the public will have an opportunity to comment on it, likely this winter.

Other elements of the current project will be analyzed for inclusion in a future project as part of the Stream Management Master Plan (SMMP) Amendment process. Staff are working with the Board of Directors to refine SMMP goals and objectives in several areas including flood protection, water quality, and water supply.  The future project would be developed to be consistent with the refined SMMP goals and objectives and with community input.