Arrow and Branch Winery, Use Permit Major Modification #P23-00057-MOD

On April 28, 2026, the Napa County Board of Supervisors approved a major modification to the Use Permit for Arrow and Branch Winery, designated as P23-00057-MOD, enabling significant expansion of operations at the winery located at 5215 Solano Avenue, Napa, CA. The modification permits an increase in annual wine production from 30,000 to 45,000 gallons, along with expanded employment, increased daily tours and tasting by appointment, and a rise in marketing events. Physical upgrades include an expansion of the existing winery building to add production and accessory space, construction of a covered terrace with outdoor tasting areas, installation of a balcony, and the placement of an 81,000-gallon process water storage tank. Existing parking is being reconfigured to accommodate the growth. The project is subject to comprehensive environmental compliance under CEQA, including adherence to the Napa County Tier 3 Water Availability Analysis and State Water Board regulations, with mitigation measures requiring a 80% three-year survival rate for replacement vegetation, installation of stream setback fencing approved by the Conservation Division, and pre-trimming assessments for bat and bird habitats conducted by qualified biologists. Construction must comply with the California Building Code and CALGreen Tier 2 standards, while stormwater controls must prevent any increase in runoff beyond predevelopment conditions, and noise levels must remain within Napa County ordinance limits of 50 dBA daytime and 45 dBA nighttime. The permittee, A&B Vineyards LLC, is responsible for implementing all mitigation and operational requirements outlined in the Mitigation Monitoring and Reporting Program, with enforcement and inspection oversight provided by multiple Napa County divisions including Planning, Building, Engineering, Code Compliance, and Conservation, as well as the California Department of Fish and Wildlife. A new water well must be constructed to 0.508” wall thickness PVC casing with specific filter packs and must yield at least 20 GPM with no more than 10 feet of drawdown. Water use must not exceed 0.3 acre-feet per acre per year, ensuring no net increase from current levels. No formal federal contract clauses, FAR provisions, or procurement elements such as contracting officer designations, payment offices, accounting codes, or evaluation factors for award were identified, indicating this is an administrative land use permit action rather than a federal procurement contract. All submissions were directed to Napa County Planning staff, with