Tres Vaqueros Windfarm Repowering Project

5 Documents in Project


SCH Number
Lead Agency
Contra Costa County
Document Title
Tres Vaqueros Windfarm Repowering Project
Document Type
NOP - Notice of Preparation
Present Land Use
The project site is approximately 1,500 acres, portions of which lie within Los Vaqueros Watershed owned by Contra Costa Water District and Vasco Caves Regional Preserve owned by East Bay Regional Park District. Development consists solely of the existing windfarm. The site is made up of rolling hills that could be used as grazing land.

Document Description
The project applicant, Tres Vaqueros Windfarms, LLC, proposes the following: " Removal of 85 330kW ad 1,750kW Howden wind turbines with a combined generating capacity of approximately 28.3 megawatts. Existing foundations would be covered with at least 1.5 feet of soil and seeded with native species. Reclaimed turbine areas would be returned to annual grassland habitat for agricultural use. " Installation of up to 42 megawatt, or similar size, wind turbines. The total height of the model currently proposed is between 282 and 315 feet - the range resulting from different tower height options. The final model and height would be determined based on the conclusions of the EIR and considerations relating to model availability. " Construction of approximately 70,000 feet (13.25 miles) of new access roads and reclamation or modification of a similar amount of existing site and turbine access roads. During construction, new access roads leading to the turbine sites would be up to 30 feet wide depending upon specific turns and required turning radii. Following construction, permanent site access and turbine maintenance roads would be 16 to 20 feet wide to accommodate maintenance vehicles. " Replacement of all existing above-ground electrical collection systems with below-ground lines. The underground transmission system would terminate at the existing substation, which connects the windfarms to a 230kV PG&E transmission line running adjacent to the project area. The "repowered" facility's energy production capability would be 3 to 4 times greater than the output capability of the existing facility. The actual "footprint" of turbine pads, foundations, underground collection facilities, the maintenance facility, and the substation would be about 44 acres, representing a 3-acre reduction from the existing facility.

Contact Information
William Nelson
Contra Costa County Dpt of Conservation & Development
651 Pine Street, 4th Floor, North Wing
Martinez, CA 94553

Phone : (925) 335-1208


37°49'12"N 121°41'48"W
Contra Costa
Cross Streets
Vasco Road
Total Acres
Parcel #
005-160-001 and several others
State Highways
East County (Byron)
Los Vaqueros Reservoir, Fish Creek, Brushy Creek
2, 3E
25, 30

Notice of Completion

Review Period Start
Review Period End
Development Type
Power:Wind (up to 42 Watts)
Local Action
Use Permit
Project Issues
Aesthetic/Visual Agricultural Land Air Quality Archaeologic-Historic Biological Resources Drainage/Absorption Flood Plain/Flooding Forest Land/Fire Hazard Geologic/Seismic Minerals Noise Population/Housing Balance Public Services Recreation/Parks Schools/Universities Septic System Sewer Capacity Soil Erosion/Compaction/Grading Solid Waste Toxic/Hazardous Traffic/Circulation Vegetation Water Quality Water Supply Wetland/Riparian Growth Inducing Land Use Cumulative Effects Other Other Issues: Greenhouse Gases
Reviewing Agencies
California Department of Parks and Recreation California Energy Commission California Highway Patrol California Native American Heritage Commission California Public Utilities Commission California Regional Water Quality Control Board, Central Valley Sacramento Region 5 Department of Toxic Substances Control Department of Water Resources Resources Agency California Department of Transportation, District 4 California Department of Fish and Wildlife, Bay Delta Region 3

Disclaimer: The document was originally posted before CEQAnet had the capability to host attachments for the public. To obtain the original attachments for this document, 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.

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