TO: Napa County Board of Supervisors
FROM: Brian D. Bordona, Director of Planning, Building and Environmental Services
REPORT BY: Jamison Crosby, Natural Resources Conservation Manager
SUBJECT: Approval of Amendment No. 2 to Agreement 200194B with the City of Napa
RECOMMENDATION
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Approve and authorize Amendment No. 2 to Agreement 200194B with the City of Napa to extend the term through June 30, 2026 and increase the County's share from $200,000 to $250,000 for joint water quality monitoring of the Lake Hennessey and Milliken Reservoir watersheds. (Fiscal Impact: $250,000 Expense; General Fund; Budgeted; Discretionary).
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BACKGROUND
The City and County have a shared interest in gathering additional data to further our understanding of how land use changes in the Hennessey and Milliken watersheds might impact the drinking water in these reservoirs. The City of Napa owns Lake Hennessey Reservoir and the Milliken Reservoir which serve as municipal drinking water supplies for the citizens of Napa and over 2,000 customers in unincorporated Napa County.
The Hennessey watershed drainage area is composed of approximately 34,000 acres reaching as far north as Angwin. Of this total area, the City owns just 2,822 acres. The Milliken watershed drainage area is composed of 6,200 acres of which the City owns nearly 2,200 acres. Both watersheds are located in the unincorporated area of the County; thus, the County approves zoning and land use laws, and processes land use permits for private development, on these important lands.
On June 20, 2017, the County and City entered into a Memorandum of Understanding (MOU) regarding a study of the watersheds that would be cost shared equally. On September 26, 2017, the Napa City Council and County Board of Supervisors approved a professional services agreement with Systech to develop a calibrated watershed analysis risk management framework (WARMF) model simulating hydrology and water quality, develop a water quality sampling ...
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