Matthes Vineyard Conversion Agricultural Erosion Control Plan #P21-00047-ECPA
3 Documents in Project
Summary
SCH Number
2025080483
Lead Agency
Napa County
Document Title
Matthes Vineyard Conversion Agricultural Erosion Control Plan #P21-00047-ECPA
Document Type
NOD - Notice of Determination
Received
Posted
2/20/2026
Document Description
Agricultural Erosion Control Plan involving land disturbing activities on slopes greater than 5% associated with Agricultural Erosion Control Plan (ECPA) #P21-00047-ECPA for the proposed clearing of vegetation, earthmoving, land contouring, and installation and maintenance of erosion control measures associated with the development of approximately 12.6 gross acres of vineyard with approximately 11 .0 net planted acres in three proposed vineyard blocks, located on an approximately 40.0-acre property. Average slopes within the development area range from 18% to 28% with an average slope of 23%, with a total of approximately 1.0-acre of non-contiguous land occurring on slopes over 30%. The proposed project would convert to vineyard the following pre-2020 Glass Fire vegetation communities: approximately 8.79 acres of mixed chaparral, 2.17 acres of coast live oak woodland, 1.94 acres of non-native annual grassland and 0.26-acre of Douglas fir forest. Based on existing (i.e., post-fire) conditions, the project proposes the removal of 17 existing oak trees and one (1) Ponderosa pine tree greater than 6-inch diameter at breast height (DBH) within an approximate 0.49-acre area. The project proposes a 7.3-acre Preservation Area, which includes 2.24 acres of the surviving intact coast live oak woodland.
Contact Information
Name
PAMELA F ARIFIAN
Agency Name
County of Napa
Job Title
Planner III
Contact Types
Lead/Public Agency
Phone
Name
William and Leigh Matthes
Agency Name
Applicant
Job Title
Applicant
Contact Types
Project Applicant
Phone
Email
Location
Coordinates
Cities
St. Helena, Unincorporated area
Counties
Napa
Regions
Countywide, Unincorporated
Cross Streets
Howell Mountain Road and Meadowood Lane
Zip
94754
Total Acres
40
Parcel #
025-070-043-000
State Highways
California
Railways
Napa Valley Wine Train
Airports
N/A
Schools
St. Helena Montessori, St. Helena Primary, St. Helena High etc.
Waterways
Napa River, Canon Creek, Conn Creek Spring Valley Creek, Sulphur Creek, York Creek
Township
08N
Range
05W
Section
30
Base
MDM
Other Location Info
No situs address. Accessed from existing private access road through neighboring parcel (APN 025-420-003-000) on Brittany Lane via Big Rock Road in City of St. Helena.
Notice of Determination
Approving Agency
Napa County
Approving Agency Role
Lead Agency
Approved On
County Clerk
Napa
Final Environmental Document Available at
1195 3rd Street, Suite 210, Napa, CA 94559
Determinations
(1) The project will have a significant impact on the environment
No
(2a) An Environmental Impact Report was prepared for this project pursuant to the provisions of CEQA
No
(2b) A Mitigated or a Negative Declaration was prepared for this project pursuant to the provisions of CEQA
Yes
(2c) An other document type was prepared for this project pursuant to the provisions of CEQA
Yes (Erosion Control Plan)
(3) Mitigated measures were made a condition of the approval of the project
Yes
(4) A mitigation reporting or monitoring plan was adopted for this project
Yes
(5) A Statement of Overriding Considerations was adopted for this project
No
(6) Findings were made pursuant to the provisions of CEQA
Yes
Attachments
Notice of Determination
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