Marin Water outlines Bolinas Road pipeline replacement and plans to limit business disruptions

Marin Municipal Water District officials told the Fairfax Town Council on March 4 they plan to replace roughly 4,300 feet of aging water main and associated service laterals along Bolinas Road, a project the district says will cut leaks, raise fire flows and make the system more seismically resilient.

The replacement, presented by Alex (MMWD engineering director) and Zach Talbot (engineering manager, design), would swap cast‑iron mains more than 100 years old for welded steel pipe and update valves, hydrant laterals and service laterals. Talbot said hydraulic modeling shows hydrant fire flow increases “up to 20% and higher in some areas,” and that the district has experienced eight or nine leaks on the corridor in the last 15 years.

Why it matters: the line serves downtown Fairfax, and a long, uncontrolled rupture on a brittle cast‑iron main could crater the road and flood properties, Talbot said. The district estimates the job will include replacing about 106 service laterals, seven hydrant laterals and two fire‑line laterals.

Construction timing and schedule: Marin Water said it expects to start in April — the firm project schedule will be posted once the contractor (Argonaut Contractors) finalizes the sequencing — and aims to finish the contract window by late summer (August) or early fall (September). Typical work hours will be weekdays, 8 a.m. to 5 p.m. The district told the council it plans to maintain two lanes of traffic where possible, with engineered traffic control plans and weekly coordination with the town’s public‑works department.

Customer notifications and interruptions: the district emphasized outreach measures — advance mailers, a project web page, and door‑hanger notices 24 to 48 hours before any planned water interruption — and said crews will attempt to keep individual service interruptions to a single day, and to alert residents to expect up to eight hours when crews must transfer a lateral. Talbot said the district will provide a 24/7 operations contact number for emergencies.

Downtown impacts and mitigation: businesses and residents focused on downtown impacts. Talbot said the district will attempt to schedule the most disruptive tie‑ins overnight downtown (roughly 10 p.m.–6 a.m.) to avoid restaurant service hours, and to coordinate with the Fairfax Chamber of Commerce so businesses can remain open. For parklets or other curbside fixtures that conflict with pipe alignment, the district said it has identified temporary storage locations and will work with owners to relocate parklet elements.

Coordination with other utilities: residents asked whether pipeline work would be paired with PG&E, sanitary or other utility replacements to avoid repeated trenching. Marin Water said coordination happens but that other utilities are scheduled independently; the district suggested some cost savings are possible when utilities share trench work, but it does not control other utilities’ schedules.

Public‑safety and traffic concerns: Council members and several residents raised the heavy‑equipment impacts on town streets and asked the town to document pre‑project road conditions. The district responded that contractor obligations include repairs for any damage caused by construction and that a certified traffic‑control plan will be required.

What’s next: Marin Water committed to posting a frequently updated project page (marinwater.org/balinaspipelinereplacementproject), distributing a more detailed construction schedule within weeks, and adding the 24/7 operations contact information to its notices. The council received the presentation and heard extended public comment and questions; no council action was required that night.

Representative quote: “We’ve calculated through our hydraulic model that we can increase fire flows along this segment by up to 20%,” said Zach Talbot, Marin Water’s engineering manager for the project.

Outlook: Residents welcomed infrastructure renewal but pressed Marin Water and the town for clear, timely business‑protection measures for the farmers market and downtown merchants, and for robust pre‑ and post‑construction road documentation. Marin Water said it will continue outreach and weekly coordination with the town’s public works staff as the contract schedule is finalized.