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 of a Draft EIR
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
Agency Name
Contra Costa County Dpt of Conservation & Development
Contact Types
Lead/Public Agency


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 Types
Power:Wind (Megawatts up to 42)
Local Actions
Use Permit
Project Issues
Aesthetics, Agriculture and Forestry Resources, Air Quality, Biological Resources, Cultural Resources, Cumulative Effects, Drainage/Absorption, Flood Plain/Flooding, Geology/Soils, Growth Inducement, Hazards & Hazardous Materials, Hydrology/Water Quality, Land Use/Planning, Mineral Resources, Noise, Population/Housing, Public Services, Recreation, Schools/Universities, Septic System, Sewer Capacity, Solid Waste, Transportation, Vegetation, Wetland/Riparian, Wildfire, Greenhouse Gases
Reviewing Agencies
California Department of Parks and Recreation, California Energy Commission, California Highway Patrol, California Native American Heritage Commission (NAHC), California Public Utilities Commission (CPUC), California Regional Water Quality Control Board, Central Valley Sacramento Region 5 (RWQCB), Department of Toxic Substances Control, Department of Water Resources, Resources Agency, California Department of Transportation, District 4 (DOT), California Department of Fish and Wildlife, Bay Delta Region 3 (CDFW)
Reviewing Agency Comments
California Department of Transportation, District 4 (DOT), California Department of Fish and Wildlife, Bay Delta Region 3 (CDFW)

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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