Spring Mountain Road Vineyard Agricultural Erosion Control Plan Track I (P25-00194-ECPA)

The Spring Mountain Road Vineyard Agricultural Erosion Control Plan (P25-00194-ECPA) is a project managed by the Napa County Department of Planning, Building and Environmental Services for the development of approximately 5.8 gross acres of vineyard on a 40.81-acre parcel in St. Helena, California. The scope involves land disturbing activities on slopes greater than 5%, including the clearing of chaparral and oak woodland, earthmoving, land contouring, and the installation of agricultural infrastructure and erosion control measures to support 3.96 net planted acres across three vineyard blocks. Technical requirements include the implementation of permanent erosion and runoff control measures such as cross-slope diversions and water bars by October 15 of the initial development year, as well as the establishment of a permanent cover crop. The project is subject to rigorous environmental compliance under CEQA, including a Mitigated Negative Declaration and a Habitat Management Plan to protect special-status species like the narrow-anthered brodiaea and the Northern Spotted Owl. Key operational timelines require vegetation removal and planting between April 1 and October 1, with winterization completed by October 15. A five-year monitoring period is mandated to ensure the success of planting areas, with annual reports and a final report submitted to Napa County. Additionally, the project requires adherence to Napa County Code, Cal Fire timber conversion exemptions, and specific biological protections, such as nesting bird surveys and the preservation of trees with a diameter breast height of 6 inches or larger.