Design Level Geotechnical Investigations for the Pacheco Reservoir Expansion Project


SCH Number
Lead Agency
Santa Clara Valley Water District
Document Title
Design Level Geotechnical Investigations for the Pacheco Reservoir Expansion Project
Document Type
MND - Mitigated Negative Declaration
Present Land Use
Ranchlands, Roadside Services
Document Description
To assist with the design and construction of Pacheco Reservoir Expansion Project, up to 149 subsurface exploratory borings (to include 119 initial borings and 30 supplemental borings with a total temporary disturbed area of 0.19 acre) are proposed to obtain essential information on subsurface geologic and geotechnical conditions. In addition, a total of 32 test pits (i.e., 0.29 acre total temporary disturbed area) are proposed as part of the Project to explore a potential borrow area for dam core zone material for the design and construction of the Pacheco Reservoir Expansion Project. The Project also proposes two types of linear surface geotechnical investigations within the Project study area to include seismic refraction and electrical resistivity. One electrical resistivity survey would be performed across the valley bottom within the upstream portion of the proposed dam. In addition, nineteen seismic-refraction lines totaling approximately 16,890 linear feet are proposed at multiple locations.

Contact Information

Todd Sexauer
Agency Name
Santa Clara Valley Water District
Job Title
Senior Environmental Planner
Contact Types
Lead/Public Agency / Project Applicant


San Jose
Santa Clara
Cross Streets
State Route 152 and El Toro Road
Total Acres
Parcel #
89811009, 89849002, additional parcels
State Highways
SR 152
North Fork Pacheco Creek, Pacheco Creek, Pacheco Reservoir
Mt Diabl
Other Location Info
The proposed project is located within, adjacent to, and in the vicinity of the existing Pacheco Reservoir, and along State Route 152 (SR-152) from Kaiser-Aetna Road to the site entrance located approximately one mile east of Kaiser-Aetna Road on the north side of SR-152. Pacheco Reservoir is located along North Fork Pacheco Creek and behind North Fork Dam (near 37.05022, -121.291754), roughly equidistant between the cities of Gilroy and Los Banos. The existing reservoir is located approximately one-half mile north of SR-152 in eastern Santa Clara County, California.

Notice of Completion

State Review Period Start
State Review Period End
State Reviewing Agencies
California Air Resources Board (ARB), California Department of Conservation (DOC), California Department of Fish and Wildlife, Bay Delta Region 3 (CDFW), California Department of Forestry and Fire Protection (CAL FIRE), California Department of Parks and Recreation, California Department of Toxic Substances Control (DTSC), California Department of Transportation, District 4 (DOT), California Department of Water Resources (DWR), California Native American Heritage Commission (NAHC), California Natural Resources Agency, California Regional Water Quality Control Board, Central Coast Region 3 (RWQCB), Office of Historic Preservation, State Water Resources Control Board, Division of Drinking Water, State Water Resources Control Board, Division of Water Rights, California Highway Patrol (CHP)
State Reviewing Agency Comments
California Highway Patrol (CHP)
Development Types
Other (Geotechnical Investigations)
Local Actions
Geotechnical Investigation Project Approval
Project Issues
Aesthetics, Agriculture and Forestry Resources, Air Quality, Biological Resources, Cultural Resources, Cumulative Effects, Energy, Flood Plain/Flooding, Geology/Soils, Greenhouse Gas Emissions, Hazards & Hazardous Materials, Hydrology/Water Quality, Land Use/Planning, Mandatory Findings of Significance, Mineral Resources, Noise, Population/Housing, Public Services, Recreation, Solid Waste, Transportation, Tribal Cultural Resources, Utilities/Service Systems, Vegetation, Wetland/Riparian, Wildfire
Local Review Period Start
Local Review Period End


Notice of Completion [NOC] Transmittal form
State Comment Letters [Comments from State Reviewing Agency(ies)]

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.

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