The Department of Terroir Security

A forest cleared for vineyard planting in Sonoma County
On January 31, the Sonoma County Board of Supervisors imposed a four-month moratorium on the development of vineyards on forested slopes and hilltops. This halt on new vines is meant to buy the County time to update the existing regulations that allow for some development on hillsides. The existing Vineyard Erosion and Sediment Control Ordinance, or VESCO rules passed in 2000 were touted as a hard-won consensus on vineyard development, but the omission of tree removal from the rules immediately led some environmental advocates to question their strength.
Sonoma County Agricultural Commissioner Tony Linegar was just three weeks on the job in January when he proposed this moratorium on slopes with more than a 15 percent grade. Officials are concerned about applications for vineyard development that would result in tree removal that would result in erosion into adjacent waterways. In the short-term, the moratorium would affect seven pending vineyard projects covering 341 acres in western and northern Sonoma County, including a 122-acre project put forward on Skaggs Springs Road by Healdsburg vinters Ken and Diane Wilson of Wilson Winery and a 40-acre proposal off Bodega Highway outside of Sebastopol by Kistler Vineyards.
While some projects may be small and the ultimate impact of tree removal might be limited in magnitude, the same might not be said for two Annapolis area proposals: Napa’s Artesa Vineyards wants to develop 146 acres, and Premier Pacific Vineyards’ “Preservation Ranch,” hopes to convert 1,769 of its 20,000 acres to vineyards. Tony Linegar has made statements about the proposed rules that indicate a clear orientation towards precaution:
We’ve seen proposals that would remove a significant number of trees on steep slopes. I don’t think it takes a rocket scientist to know that that is going to affect erosion …. Some of the projects that we have in front of us now are proposing to remove large amount of trees. We’re not talking about small acreages …. Rather than let these projects go forward and cause a problem with sedimentation, we’d rather be proactive.
