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Santa Rosa completes Llano Trunk Rehabilitation Phase 1 on schedule and under initial estimate
Summary
City staff reported completion of the Llano Trunk Rehabilitation Phase 1, a 66-inch, roughly 8,100-foot sewer rehab that used cured-in-place lining, required significant environmental mitigation and bypass pumping, and is expected to finish closer to $18.5 million versus an initial $21 million estimate.
Construction is complete on the Llano Trunk Rehabilitation Phase 1 project, city staff told the Board of Public Utilities. Supervising engineer Richela Maeda said the work rehabilitated a 66-inch trunk sewer that runs from the Laguna treatment plant north of Todd Road for about 8,100 linear feet and included inspection and rehabilitation of 15 manholes.
Maeda said the project required bypassing roughly two-thirds of the city’s wastewater flow — about 16 million gallons per day — around the work area. The bypass system used three parallel 18‑inch temporary pipes and six on‑site pumps for redundancy; about 25 truck deliveries were needed to bring fusionable bypass pipe to the site.…
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