Planning Commission - Regular Meeting

DIAMOND MOUNTAIN VINEYARD COMPANY INC/ DIAMOND CREEK VINEYARDS / MAJOR MODIFICATION NO. P19-00177 - MOD & REQUEST FOR EXCEPTION TO THE NAPA COUNTY ROAD AND STREET STANDARDS

CEQA STATUS: Consideration and possible adoption of a Mitigated Negative Declaration and a Mitigation Monitoring and Reporting Program (MMRP) (SCH#2025120440). According to the proposed Mitigated Negative Declaration, the proposed project would not have any potentially significant environmental impacts after implementation of mitigation measures. Mitigation measures are proposed for the following area: Biological Resources. The project site is not included on a list of hazardous materials sites compiled pursuant to Government Code Section 65962.5. The project was scheduled to be heard at the Planning Commission Hearing of January 7, 2026. However, due to an unannounced closure of the Governor's Office of Land Use and Climate Innovation, the posting of Initial Study-Mitigated Negative Declaration prepared for this project was delayed, Since the project was not posted in a timely manner that would allow State or public review for the required 30 day review period prior to the hearing, the item was continued to January 21, 2026. In accordance with Section 15105(b) of the California Environmental Quality Act (CEQA) Guidelines, Napa County submitted the proposed Initial Study/Mitigated Negative Declaration to the State Clearinghouse for a 30-day review period beginning December 10, 2025, and running through January 9, 2026. REQUEST: This application was submitted to participate in the County's Code Compliance Program as described in Resolution No. 2018-164 adopted by the Napa County Board of Supervisors on December 4, 2018. The proposal is to modify an existing winery Use Permit and subsequent modifications to recognize and approve items that are out of compliance with the permitted entitlements and for expansion beyond existing entitlements such as construction of a new winery building and agricultural storage building, increase in annual wine production, number of employees, weekly visitation, on-premises consumption of wine produced on-site, additional parking, decrease in the number of marketing events, necessary infrastructure improvements and upgrades to the wastewater system, and conversion of the existing winery building to a single-family residence with parking. The request also includes an Exception to the Napa County Road and Street Standards. The project is located on a 78.12-acre holding within the Agricultural Watershed (AW) zoning district and General Plan designated as Agriculture, Watershed, and Open Space (AWOS) at 1500 Diamond Mountain Road, Calistoga, CA 94515. APN 020-440-004 (Winery Parcel) and 020-400-012 (Residential Parcel). STAFF RECOMMENDATION: Adopt the Mitigated Negative Declaration/MMRP and approve an Exception to the Napa County Road and Street Standards (RSS), and a Winery Use Permit Modification subject to the recommended conditions of approval. STAFF CONTACT: Kelli Cahill, Planner III, (707) 265-2325 or kelli.cahill@countyofnapa.org APPLICANT AGENT CONTACT: Lester Hardy, Attorney; (707) 480-8093; lester@lfhardy.com CONTINUED FROM JANUARY 7, 2026 PLANNING COMMISSION MEETING. **Attachments:** Attachment A - Recommended Findings Attachment B - Recommended Conditions of Approval and Final Agency Approval Memos Attachment C - Initial Study Mitigated Negative Declaration and MMRP Attachment D - Previous Conditions of Approval Attachment F - Request for Exception to the Road and Street Standards Attachment E - Use Permit Major Mod Application Packet Attachment G - Water Availability Analysis and Supplemental WAA for Interim Program Attachment H - Wastewater Feasibility Report Attachment I - Stormwater Control Plan Attachment J - Biological Resources Assessment Attachment J.1 - Potential Canopy Preservation Areas Attachment K - Trip Generation Worksheet Attachment L - Sight Distance Report Attachment M - Bridge Condition Report Attachment N - Winery Comparison Analysis and Summary of Changes Attachment O - Graphics Attachment P - Public Comments