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Tree staff and commissioners push for Vina GSA review after consultant memo omits Bidwell Park as a groundwater-dependent ecosystem
Summary
Tree division staff and commissioners questioned a technical memo that does not classify Bidwell Park as groundwater dependent and asked the Vina Groundwater Sustainability Agency or consultant ESA to present corrected data; staff pointed to differing rooting-depth figures for valley oak (18 ft in the memo vs. 28.2 ft in peer-reviewed studies).
Richie, a city tree-division staff member, updated the commission on tree plantings and trimming work across the city and then raised concerns about the Groundwater Sustainability Plan (GSP) technical memorandum that excludes Bidwell Park from classification as a groundwater-dependent ecosystem (GDE).
Richie and several commissioners said they disagree with the consultant memo’s assumptions about rooting depths and hydrology. “We don’t agree that Bidwell Park is not a groundwater dependent ecosystem,” he said, and urged the commission to invite the Vina GSA or the consultant (ESA) to present the underlying data and methods to the commission so they can comment before the GSP update is finalized.
The tree-division presentation listed recent plantings (almost 60 trees in phase 1), ongoing trimming projects (210 trees on Valumbroza) and noted work delayed at Cedar Grove because of a great horned owl nest. Commissioners asked for the source data and suggested asking the GSA to present peer-reviewed research and local site conditions.
Why it matters: classification as a groundwater-dependent ecosystem could affect future water-management measures and grant eligibility and could change how the city evaluates impacts of groundwater-level changes on the urban forest.
Next steps: staff suggested inviting the Vina GSA and the consultant ESA to a future meeting to present data and respond to commission concerns; commissioners requested follow-up and additional technical detail.
