Three Twins Vineyard Conversion Agricultural Erosion Control Plan #P18-00435-ECPA


SCH Number
Lead Agency
Napa County
Document Title
Three Twins Vineyard Conversion Agricultural Erosion Control Plan #P18-00435-ECPA
Document Type
MND - Mitigated Negative Declaration
Present Land Use
Residential, Agriculture (Agriculture, Watershed and Open Space General Plan Land Use Designation; Agricultural Watershed zoning)

Document Description
The project involves the clearing of brush and trees within the proposed clearing limits, earthmoving, and the installation and maintenance of erosion control measures in connection with the development of 1.7 net acres of new vineyard within 2.5 gross acres on the 22.96 acre parcel.

Contact Information
Pamela Arifian
County of Napa
Lead/Public Agency
1195 Third Street Second Floor
Napa, CA 94559

Phone : (707) 259-5934

Three Twins LLC c/o Richard Talmadge
Project Applicant


38°30'41"N 122°23'18"W
Countywide Northern California San Francisco Bay Area
Cross Streets
Conn Valley Road; Greenfield Way
Total Acres
Parcel #
State Highways
Angwin Parrett Field (4 miles)
St. Helena Elementary; St. Helena High
Lake Hennessey
8 N
5 W
Mt. Diab

Notice of Completion

Review Period Start
Review Period End
Development Type
Agriculture (Vineyard)
Local Action
Project Issues
Aesthetics Agriculture and Forestry Resources Air Quality Biological Resources Cultural Resources Cumulative Effects Drainage/Absorption Flood Plain/Flooding Geology/Soils Greenhouse Gas Emissions Hazards & Hazardous Materials Hydrology/Water Quality Land Use/Planning Mineral Resources Noise Population/Housing Public Services Recreation Schools/Universities Transportation Tribal Cultural Resources Vegetation Wildfire Wildlife
Reviewing Agencies
California Air Resources Board (ARB) California Department of Conservation (DOC) California Department of Forestry and Fire Protection (CAL FIRE) California Department of Parks and Recreation California Department of Pesticide Regulation (DPR) California Department of Transportation, District 4 (DOT) California Department of Water Resources (DWR) California Highway Patrol (CHP) California Native American Heritage Commission (NAHC) California Natural Resources Agency California Regional Water Quality Control Board, San Francisco Bay Region 2 (RWQCB) California State Lands Commission (SLC) Department of Toxic Substances Control Office of Historic Preservation State Water Resources Control Board, Division of Water Quality California Department of Fish and Wildlife, Bay Delta Region 3 (CDFW)


Environmental Document
Exhibit A - Three Twins Vineyard Revised Track I ECP - Apr 2019   PDF 13978 K Exhibit B-1 - BRRS - WRA Aug 2018   PDF 5032 K Exhibit B-2 - WRA Response to Three Twins County Comments Letter_20190211   PDF 7056 K Exhibit C - Cultural Report - Flaherty June 2017   PDF 118 K Exhibit D - Three Twins Soil Loss Analysis   PDF 12408 K Exhibit E - Three Twins Hydrology Report Oct 2018   PDF 10558 K Exhibit F - ThreeTwins_WAA_OEI_Final_12032018   PDF 4938 K Exhibit G - P05-0121-ECPA Three Twins   PDF 12444 K Figure 1 Site Location P18-00435   PDF 2882 K Figure 2 P18-00435   PDF 2854 K Figure 3 P18-00435   PDF 2474 K Figure 4 Mitigated Project Boundary P18-00345   PDF 2502 K Initial Study ThreeTwins_P18-00435-ECPA October 2020   PDF 4536 K Notice of Intent_ThreeTwins_P18-00435-ECPA   PDF 125 K Summary Form F_ ThreeTwins_P18-00435-ECPA   PDF 190 K
Notice of Completion_ThreeTwins P18-00435-ECPA_signed   PDF 429 K
State Comments
2020100477_CDFW Comment   PDF 381 K

Disclaimer: The Governor’s Office of Planning and Research (OPR) accepts no responsibility for the content or accessibility of these documents. To obtain an attachment in a different format, please contact the lead agency at the contact information listed above. You may also contact the OPR via email at or via phone at (916) 445-0613. For more information, please visit OPR’s Accessibility Site.

Download CSV Download All Attachments New Search Print